SyntaxFix

Programs & Examples On #Partialviews

Cookie blocked/not saved in IFRAME in Internet Explorer

A better solution would be to make an Ajax call inside the iframe to the page that would get/set cookies...

jQuery jump or scroll to certain position, div or target on the page from button onclick

 
$("html, body").scrollTop($(element).offset().top); // <-- Also integer can be used

How can I get a Unicode character's code?

Just convert it to int:

char registered = '®';
int code = (int) registered;

In fact there's an implicit conversion from char to int so you don't have to specify it explicitly as I've done above, but I would do so in this case to make it obvious what you're trying to do.

This will give the UTF-16 code unit - which is the same as the Unicode code point for any character defined in the Basic Multilingual Plane. (And only BMP characters can be represented as char values in Java.) As Andrzej Doyle's answer says, if you want the Unicode code point from an arbitrary string, use Character.codePointAt().

Once you've got the UTF-16 code unit or Unicode code points, but of which are integers, it's up to you what you do with them. If you want a string representation, you need to decide exactly what kind of representation you want. (For example, if you know the value will always be in the BMP, you might want a fixed 4-digit hex representation prefixed with U+, e.g. "U+0020" for space.) That's beyond the scope of this question though, as we don't know what the requirements are.

Video auto play is not working in Safari and Chrome desktop browser

I've just get now the same issue with my video

<video preload="none" autoplay="autoplay" loop="loop">
  <source src="Home_Teaser.mp4" type="video/mp4">
  <source src="Home_Teaser" type="video/webm">
  <source src="Home_Teaser.ogv" type="video/ogg">
</video>

After search, I've found a solution:

If I set "preload" attributes to "true" the video start normally

move column in pandas dataframe

Simple solution:

old_cols = df.columns.values 
new_cols= ['a', 'y', 'b', 'x']
df = df.reindex(columns=new_cols)

What is the significance of 1/1/1753 in SQL Server?

1752 was the year of Britain switching from the Julian to the Gregorian calendar. I believe two weeks in September 1752 never happened as a result, which has implications for dates in that general area.

An explanation: http://uneasysilence.com/archive/2007/08/12008/ (Internet Archive version)

What’s the difference between "Array()" and "[]" while declaring a JavaScript array?

For more information, the following page describes why you never need to use new Array()

You never need to use new Object() in JavaScript. Use the object literal {} instead. Similarly, don’t use new Array(), use the array literal [] instead. Arrays in JavaScript work nothing like the arrays in Java, and use of the Java-like syntax will confuse you.

Do not use new Number, new String, or new Boolean. These forms produce unnecessary object wrappers. Just use simple literals instead.

Also check out the comments - the new Array(length) form does not serve any useful purpose (at least in today's implementations of JavaScript).

How to install Visual Studio 2015 on a different drive

Anyone tried this approach?

Doing a dir /s vs_ultimate.exe from the root prompt will find it. Mine was in <C:\ProgramData\Package Cache\{[guid]}>. Once I navigated there and ran vs_community_ENU.exe /uninstall /force it uninstalled all the Visual Studio assets I believe.

Got the advice from this post.

How to upload & Save Files with Desired name

 
 <html>
<head>
<title>PHP Reanme image example</title>
</head>
<body>

<form action="fileupload.php" enctype="multipart/form-data" method="post">
Select image :
<input type="file" name="file"><br/>
Enter image name :<input type="text" name="filename"><br/>
<input type="submit" value="Upload" name="Submit1">

</form>

<?php

if(isset($_POST['Submit1']))
{ 


$extension = pathinfo($_FILES["file"]["name"], PATHINFO_EXTENSION);
$name = $_POST["filename"];

move_uploaded_file($_FILES["file"]["tmp_name"], $name.".".$extension);
echo "Old Image Name = ". $_FILES["file"]["name"]."<br/>";
echo "New Image Name = " . $name.".".$extension;

}


?>
</body>
</html>

Click [here] (https://meeraacademy.com/php-rename-image-while-image-uploading/

How can I fix the 'Missing Cross-Origin Resource Sharing (CORS) Response Header' webfont issue?

I'm going to assume your host is using C-Panel - and that it's probably HostGator or GoDaddy. In both cases they use C-Panel (in fact, a lot of hosts do) to make the Server administration as easy as possible on you, the end user. Even if you are hosting through someone else - see if you can log in to some kind of admin panel and find an .htaccess file that you can edit. (Note: The period before just means that it's a "hidden" file/directory).

Once you find the htaccess file add the following line:

  1. Header set Access-Control-Allow-Origin "*" Just to see if it works. Warning: Do not use this line on a production server

It should work. If not, call your host and ask them why the line isn't working - they'll probably be able to help you quickly from there.

  1. Once you do have the above working change the * to the address of the requesting domain http://cyclistinsuranceaustralia.com.au/. You may find an issue with canonical addressing (including the www) and if so you may need to configure your host for a redirect. That's a different and smaller bridge to cross though. You'll at least be in the right place.

Batch files - number of command line arguments

You tend to handle number of arguments with this sort of logic:

IF "%1"=="" GOTO HAVE_0
IF "%2"=="" GOTO HAVE_1
IF "%3"=="" GOTO HAVE_2

etc.

If you have more than 9 arguments then you are screwed with this approach though. There are various hacks for creating counters which you can find here, but be warned these are not for the faint hearted.

What is the difference between And and AndAlso in VB.NET?

 
If Bool1 And Bool2 Then

Evaluates both Bool1 and Bool2

If Bool1 AndAlso Bool2 Then

Evaluates Bool2 if and only if Bool1 is true.

In WPF, what are the differences between the x:Name and Name attributes?

Name:

  1. can be used only for descendants of FrameworkElement and FrameworkContentElement;
  2. can be set from code-behind via SetValue() and property-like.

x:Name:

  1. can be used for almost all XAML elements;
  2. can NOT be set from code-behind via SetValue(); it can only be set using attribute syntax on objects because it is a directive.

Using both directives in XAML for one FrameworkElement or FrameworkContentElement will cause an exception: if the XAML is markup compiled, the exception will occur on the markup compile, otherwise it occurs on load.

Solving "adb server version doesn't match this client" error

I had same problem since updated platfrom-tool to version 24 and not sure for root cause...(current adb version is 1.0.36)

Also try adb kill-server and adb start-server but problem still happened

but when I downgrade adb version to 1.0.32 everything work will

Is there an equivalent of 'which' on the Windows command line?

In Windows CMD which calls where:

$ where php
C:\Program Files\PHP\php.exe

How to change the port of Tomcat from 8080 to 80?

I tried changing the port from 8080 to 80 in the server.xml but it didn't work for me. Then I found alternative, update the iptables which i'm sure there is an impact on performance.

I use the following commands:

sudo /sbin/iptables -t nat -I PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080
sudo /sbin/service iptables save

http://www.excelsior-usa.com/articles/tomcat-amazon-ec2-advanced.html#port80

Using IF ELSE in Oracle

You can use Decode as well:

SELECT DISTINCT a.item, decode(b.salesman,'VIKKIE','ICKY',Else),NVL(a.manufacturer,'Not Set')Manufacturer
FROM inv_items a, arv_sales b
WHERE a.co = b.co
      AND A.ITEM_KEY = b.item_key
      AND a.co = '100'
AND a.item LIKE 'BX%'
AND b.salesman in ('01','15')
AND trans_date BETWEEN to_date('010113','mmddrr')
                         and to_date('011713','mmddrr')
GROUP BY a.item, b.salesman, a.manufacturer
ORDER BY a.item

Console app arguments, how arguments are passed to Main method

All answers are awesome and explained everything very well

but I just want to point out different way for passing args to main method

in visual studio

  1. right click on Project then choose Properties
  2. go to Debug tab then on the Start Options section provide the app with your args

like this image

Properties window

and happy knowing secrets

How to update-alternatives to Python 3 without breaking apt?

As I didn't want to break anything, I did this to be able to use newer versions of Python3 than Python v3.4 : 

$ sudo update-alternatives --install /usr/local/bin/python3 python3 /usr/bin/python3.6 1
update-alternatives: using /usr/bin/python3.6 to provide /usr/local/bin/python3 (python3) in auto mode
$ sudo update-alternatives --install /usr/local/bin/python3 python3 /usr/bin/python3.7 2
update-alternatives: using /usr/bin/python3.7 to provide /usr/local/bin/python3 (python3) in auto mode
$ update-alternatives --list python3
/usr/bin/python3.6
/usr/bin/python3.7
$ sudo update-alternatives --config python3
There are 2 choices for the alternative python3 (providing /usr/local/bin/python3).

  Selection    Path                Priority   Status
------------------------------------------------------------
* 0            /usr/bin/python3.7   2         auto mode
  1            /usr/bin/python3.6   1         manual mode
  2            /usr/bin/python3.7   2         manual mode

Press enter to keep the current choice[*], or type selection number: 1
update-alternatives: using /usr/bin/python3.6 to provide /usr/local/bin/python3 (python3) in manual mode
$ ls -l /usr/local/bin/python3 /etc/alternatives/python3 
lrwxrwxrwx 1 root root 18 2019-05-03 02:59:03 /etc/alternatives/python3 -> /usr/bin/python3.6*
lrwxrwxrwx 1 root root 25 2019-05-03 02:58:53 /usr/local/bin/python3 -> /etc/alternatives/python3*

How can I decrypt a password hash in PHP?

I need to decrypt a password. The password is crypted with password_hash function.

$password = 'examplepassword';
$crypted = password_hash($password, PASSWORD_DEFAULT);

Its not clear to me if you need password_verify, or you are trying to gain unauthorized access to the application or database. Other have talked about password_verify, so here's how you could gain unauthorized access. Its what bad guys often do when they try to gain access to a system.

First, create a list of plain text passwords. A plain text list can be found in a number of places due to the massive data breaches from companies like Adobe. Sort the list and then take the top 10,000 or 100,000 or so.

Second, create a list of digested passwords. Simply encrypt or hash the password. Based on your code above, it does not look like a salt is being used (or its a fixed salt). This makes the attack very easy.

Third, for each digested password in the list, perform a select in an attempt to find a user who is using the password:

$sql_script = 'select * from USERS where password="'.$digested_password.'"'

Fourth, profit.

So, rather than picking a user and trying to reverse their password, the bad guy picks a common password and tries to find a user who is using it. Odds are on the bad guy's side...

Because the bad guy does these things, it would behove you to not let users choose common passwords. In this case, take a look at ProCheck, EnFilter or Hyppocrates (et al). They are filtering libraries that reject bad passwords. ProCheck achieves very high compression, and can digest multi-million word password lists into a 30KB data file.

Angular CLI - Please add a @NgModule annotation when using latest

The problem is the import of ProjectsListComponent in your ProjectsModule. You should not import that, but add it to the export array, if you want to use it outside of your ProjectsModule.

Other issues are your project routes. You should add these to an exportable variable, otherwise it's not AOT compatible. And you should -never- import the BrowserModule anywhere else but in your AppModule. Use the CommonModule to get access to the *ngIf, *ngFor...etc directives:

@NgModule({
  declarations: [
     ProjectsListComponent
  ],
  imports: [
    CommonModule,
    RouterModule.forChild(ProjectRoutes)
  ],
  exports: [
     ProjectsListComponent
  ]
})

export class ProjectsModule {}

project.routes.ts

export const ProjectRoutes: Routes = [
      { path: 'projects', component: ProjectsListComponent }
]

How to create byte array from HttpPostedFile

in your question, both buffer and byteArray seem to be byte[]. So:

ImageElement image = ImageElement.FromBinary(buffer);

How To Use DateTimePicker In WPF?

For the controls embedded in WPF Extended WPF Toolkit Release 1.4.0, please refer http://elegantcode.com/2011/04/08/extended-wpf-toolkit-release-1-4-0/

For Calendar & DatePicker Walkthrough please refer, http://windowsclient.net/wpf/wpf35/wpf-35sp1-toolkit-calendar-datepicker-walkthrough.aspx

And you can cutomize the look and feel by Microsoft Expression Studio [Use Edit Template option] Sample shows here:

Add following namespaces to xaml page

xmlns:toolkit="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit.Extended"
xmlns:Microsoft_Windows_Controls_Core_Converters="clr-namespace:Microsoft.Windows.Controls.Core.Converters;assembly=WPFToolkit.Extended" 
xmlns:Microsoft_Windows_Controls_Chromes="clr-namespace:Microsoft.Windows.Controls.Chromes;assembly=WPFToolkit.Extended"

Add followings to Page/Window resources

<!--DateTimePicker Customized Style-->
        <Style x:Key="DateTimePickerStyle1" TargetType="{x:Type toolkit:DateTimePicker}">
            <Setter Property="TimeWatermarkTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <ContentControl Content="{Binding}" Foreground="Gray" Focusable="False"/>
                    </DataTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="WatermarkTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <ContentControl Content="{Binding}" Foreground="Gray" Focusable="False"/>
                    </DataTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type toolkit:DateTimePicker}">
                        <Border>
                            <Grid>
                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="*"/>
                                        <ColumnDefinition Width="Auto"/>
                                    </Grid.ColumnDefinitions>

                                    <toolkit:DateTimeUpDown AllowSpin="{TemplateBinding AllowSpin}" 
                                                                  BorderThickness="1,1,0,1" 
                                                                  FormatString="{TemplateBinding FormatString}" 
                                                                  Format="{TemplateBinding Format}" 
                                                                  ShowButtonSpinner="{TemplateBinding ShowButtonSpinner}" 
                                                                  Value="{Binding Value, RelativeSource={RelativeSource TemplatedParent}}" 
                                                                  WatermarkTemplate="{TemplateBinding WatermarkTemplate}" 
                                                                  Watermark="{TemplateBinding Watermark}" 
                                                                  Foreground="#FFEFE3E3" 
                                                                  BorderBrush="#FFEBB31A">
                                        <toolkit:DateTimeUpDown.Background>
                                            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                                <GradientStop Color="Black" Offset="0"/>
                                                <GradientStop Color="#FF2F2828" Offset="1"/>
                                            </LinearGradientBrush>
                                        </toolkit:DateTimeUpDown.Background>
                                    </toolkit:DateTimeUpDown>

                                    <ToggleButton x:Name="_calendarToggleButton" 
                                                  Background="{x:Null}" Grid.Column="1" IsChecked="{Binding IsOpen, RelativeSource={RelativeSource TemplatedParent}}">
                                        <ToggleButton.IsHitTestVisible>
                                            <Binding Path="IsOpen" RelativeSource="{RelativeSource TemplatedParent}">
                                                <Binding.Converter>
                                                    <Microsoft_Windows_Controls_Core_Converters:InverseBoolConverter/>
                                                </Binding.Converter>
                                            </Binding>
                                        </ToggleButton.IsHitTestVisible>
                                        <ToggleButton.Style>
                                            <Style TargetType="{x:Type ToggleButton}">
                                                <Setter Property="Template">
                                                    <Setter.Value>
                                                        <ControlTemplate TargetType="{x:Type ToggleButton}">
                                                            <Grid SnapsToDevicePixels="True">
                                                                <Microsoft_Windows_Controls_Chromes:ButtonChrome x:Name="ToggleButtonChrome" CornerRadius="0,2.75,2.75,0" InnerCornerRadius="0,1.75,1.75,0" RenderMouseOver="{TemplateBinding IsMouseOver}" RenderPressed="{TemplateBinding IsPressed}" BorderBrush="{x:Null}">
                                                                    <Microsoft_Windows_Controls_Chromes:ButtonChrome.Background>
                                                                        <LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0">
                                                                            <GradientStop Color="#FFF3F3F3" Offset="1"/>
                                                                            <GradientStop Color="#7FC0A112"/>
                                                                        </LinearGradientBrush>
                                                                    </Microsoft_Windows_Controls_Chromes:ButtonChrome.Background>
                                                                </Microsoft_Windows_Controls_Chromes:ButtonChrome>
                                                                <Grid>
                                                                    <Grid.ColumnDefinitions>
                                                                        <ColumnDefinition Width="*"/>
                                                                        <ColumnDefinition Width="Auto"/>
                                                                    </Grid.ColumnDefinitions>
                                                                    <ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" HorizontalAlignment="Stretch" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Stretch"/>
                                                                    <Grid x:Name="arrowGlyph" Grid.Column="1" IsHitTestVisible="False" Margin="5">
                                                                        <Path Data="M0,1C0,1 0,0 0,0 0,0 3,0 3,0 3,0 3,1 3,1 3,1 4,1 4,1 4,1 4,0 4,0 4,0 7,0 7,0 7,0 7,1 7,1 7,1 6,1 6,1 6,1 6,2 6,2 6,2 5,2 5,2 5,2 5,3 5,3 5,3 4,3 4,3 4,3 4,4 4,4 4,4 3,4 3,4 3,4 3,3 3,3 3,3 2,3 2,3 2,3 2,2 2,2 2,2 1,2 1,2 1,2 1,1 1,1 1,1 0,1 0,1z" Fill="#FF82E511" Height="4" Width="7"/>
                                                                    </Grid>
                                                                </Grid>
                                                            </Grid>
                                                        </ControlTemplate>
                                                    </Setter.Value>
                                                </Setter>
                                            </Style>
                                        </ToggleButton.Style>
                                    </ToggleButton>
                                </Grid>

                                <Popup IsOpen="{Binding IsChecked, ElementName=_calendarToggleButton}" StaysOpen="False">
                                    <Border BorderThickness="1" Padding="3">
                                        <Border.BorderBrush>
                                            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                                <GradientStop Color="#FFA3AEB9" Offset="0"/>
                                                <GradientStop Color="#FF8399A9" Offset="0.375"/>
                                                <GradientStop Color="#FF718597" Offset="0.375"/>
                                                <GradientStop Color="#FFD2C217" Offset="1"/>
                                            </LinearGradientBrush>
                                        </Border.BorderBrush>
                                        <Border.Background>
                                            <LinearGradientBrush EndPoint="0,1" StartPoint="0,0">
                                                <GradientStop Color="White" Offset="0"/>
                                                <GradientStop Color="#FFE9B116" Offset="1"/>
                                            </LinearGradientBrush>
                                        </Border.Background>
                                        <StackPanel Background="{x:Null}">
                                            <Calendar x:Name="Part_Calendar" BorderThickness="0" DisplayDate="2011-06-28" Background="#7FE0B41A"/>
                                            <toolkit:TimePicker x:Name="Part_TimeUpDown" Format="ShortTime" Value="{Binding Value, RelativeSource={RelativeSource TemplatedParent}}" WatermarkTemplate="{TemplateBinding TimeWatermarkTemplate}" Watermark="{TemplateBinding TimeWatermark}" Background="{x:Null}" Style="{DynamicResource TimePickerStyle1}"/>
                                        </StackPanel>
                                    </Border>
                                </Popup>
                            </Grid>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <Style x:Key="TimePickerStyle1" 
               TargetType="{x:Type toolkit:TimePicker}">
            <Setter Property="WatermarkTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <ContentControl Content="{Binding}" Foreground="Gray" Focusable="False"/>
                    </DataTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type toolkit:TimePicker}">
                        <Border>
                            <Grid>
                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="*"/>
                                        <ColumnDefinition Width="Auto"/>
                                    </Grid.ColumnDefinitions>
                                    <Grid>
                                        <toolkit:DateTimeUpDown x:Name="PART_TimeUpDown" AllowSpin="{TemplateBinding AllowSpin}" BorderThickness="1,1,0,1" FormatString="{TemplateBinding FormatString}" ShowButtonSpinner="{TemplateBinding ShowButtonSpinner}" Value="{Binding Value, RelativeSource={RelativeSource TemplatedParent}}" WatermarkTemplate="{TemplateBinding WatermarkTemplate}" Watermark="{TemplateBinding Watermark}" Background="#7FE0B41A" BorderBrush="#FFF9F2F2">
                                            <toolkit:DateTimeUpDown.Format>
                                                <TemplateBinding Property="Format">
                                                    <TemplateBinding.Converter>
                                                        <Microsoft_Windows_Controls_Core_Converters:TimeFormatToDateTimeFormatConverter/>
                                                    </TemplateBinding.Converter>
                                                </TemplateBinding>
                                            </toolkit:DateTimeUpDown.Format>
                                        </toolkit:DateTimeUpDown>
                                    </Grid>
                                    <ToggleButton x:Name="_timePickerToggleButton" Grid.Column="1" IsChecked="{Binding IsOpen, RelativeSource={RelativeSource TemplatedParent}}" >
                                        <ToggleButton.IsHitTestVisible>
                                            <Binding Path="IsOpen" RelativeSource="{RelativeSource TemplatedParent}">
                                                <Binding.Converter>
                                                    <Microsoft_Windows_Controls_Core_Converters:InverseBoolConverter/>
                                                </Binding.Converter>
                                            </Binding>
                                        </ToggleButton.IsHitTestVisible>
                                        <ToggleButton.Style>
                                            <Style TargetType="{x:Type ToggleButton}">
                                                <Setter Property="Template">
                                                    <Setter.Value>
                                                        <ControlTemplate TargetType="{x:Type ToggleButton}">
                                                            <Grid SnapsToDevicePixels="True">
                                                                <Microsoft_Windows_Controls_Chromes:ButtonChrome x:Name="ToggleButtonChrome" CornerRadius="0,2.75,2.75,0" InnerCornerRadius="0,1.75,1.75,0" RenderMouseOver="{TemplateBinding IsMouseOver}" RenderPressed="{TemplateBinding IsPressed}"/>
                                                                <Grid>
                                                                    <Grid.ColumnDefinitions>
                                                                        <ColumnDefinition Width="*"/>
                                                                        <ColumnDefinition Width="Auto"/>
                                                                    </Grid.ColumnDefinitions>
                                                                    <ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" HorizontalAlignment="Stretch" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Stretch"/>
                                                                    <Grid x:Name="arrowGlyph" Grid.Column="1" IsHitTestVisible="False" Margin="5">
                                                                        <Path Data="M0,1C0,1 0,0 0,0 0,0 3,0 3,0 3,0 3,1 3,1 3,1 4,1 4,1 4,1 4,0 4,0 4,0 7,0 7,0 7,0 7,1 7,1 7,1 6,1 6,1 6,1 6,2 6,2 6,2 5,2 5,2 5,2 5,3 5,3 5,3 4,3 4,3 4,3 4,4 4,4 4,4 3,4 3,4 3,4 3,3 3,3 3,3 2,3 2,3 2,3 2,2 2,2 2,2 1,2 1,2 1,2 1,1 1,1 1,1 0,1 0,1z" Fill="Black" Height="4" Width="7"/>
                                                                    </Grid>
                                                                </Grid>
                                                            </Grid>
                                                        </ControlTemplate>
                                                    </Setter.Value>
                                                </Setter>
                                            </Style>
                                        </ToggleButton.Style>
                                    </ToggleButton>
                                </Grid>

                                <Popup IsOpen="{Binding IsChecked, ElementName=_timePickerToggleButton}" StaysOpen="False">
                                    <Border BorderThickness="1">
                                        <Border.Background>
                                            <LinearGradientBrush EndPoint="0,1" StartPoint="0,0">
                                                <GradientStop Color="White" Offset="0"/>
                                                <GradientStop Color="#FFE7C857" Offset="1"/>
                                            </LinearGradientBrush>
                                        </Border.Background>
                                        <Border.BorderBrush>
                                            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                                <GradientStop Color="#FFA3AEB9" Offset="0"/>
                                                <GradientStop Color="#FF8399A9" Offset="0.375"/>
                                                <GradientStop Color="#FF718597" Offset="0.375"/>
                                                <GradientStop Color="#FF617584" Offset="1"/>
                                            </LinearGradientBrush>
                                        </Border.BorderBrush>

                                        <Grid>
                                            <ListBox x:Name="PART_TimeListItems" BorderThickness="0" DisplayMemberPath="Display" Height="130" Width="150" Background="#7FE0B41A">
                                                <ListBox.ItemContainerStyle>
                                                    <Style TargetType="{x:Type ListBoxItem}">
                                                        <Setter Property="Template">
                                                            <Setter.Value>
                                                                <ControlTemplate TargetType="{x:Type ListBoxItem}">
                                                                    <Border x:Name="Border" SnapsToDevicePixels="True">
                                                                        <ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" Margin="4"/>
                                                                    </Border>
                                                                    <ControlTemplate.Triggers>
                                                                        <Trigger Property="IsMouseOver" Value="True">
                                                                            <Setter Property="Background" TargetName="Border" Value="#FFE7F5FD"/>
                                                                        </Trigger>
                                                                        <Trigger Property="IsSelected" Value="True">
                                                                            <Setter Property="Background" TargetName="Border" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                                                                            <Setter Property="Foreground" Value="White"/>
                                                                        </Trigger>
                                                                    </ControlTemplate.Triggers>
                                                                </ControlTemplate>
                                                            </Setter.Value>
                                                        </Setter>
                                                    </Style>
                                                </ListBox.ItemContainerStyle>
                                            </ListBox>
                                        </Grid>
                                    </Border>
                                </Popup>
                            </Grid>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

And in Window you can use the style as

Thanks,

Installing SciPy with pip

In my case, it wasn't working until I also installed the following package : libatlas-base-dev, gfortran

 sudo apt-get install libatlas-base-dev gfortran

Then run pip install scipy

Apache Spark: The number of cores vs. the number of executors

I haven't played with these settings myself so this is just speculation but if we think about this issue as normal cores and threads in a distributed system then in your cluster you can use up to 12 cores (4 * 3 machines) and 24 threads (8 * 3 machines). In your first two examples you are giving your job a fair number of cores (potential computation space) but the number of threads (jobs) to run on those cores is so limited that you aren't able to use much of the processing power allocated and thus the job is slower even though there is more computation resources allocated.

you mention that your concern was in the shuffle step - while it is nice to limit the overhead in the shuffle step it is generally much more important to utilize the parallelization of the cluster. Think about the extreme case - a single threaded program with zero shuffle.

How to prevent scanf causing a buffer overflow in C?

Directly using scanf(3) and its variants poses a number of problems. Typically, users and non-interactive use cases are defined in terms of lines of input. It's rare to see a case where, if enough objects are not found, more lines will solve the problem, yet that's the default mode for scanf. (If a user didn't know to enter a number on the first line, a second and third line will probably not help.)

At least if you fgets(3) you know how many input lines your program will need, and you won't have any buffer overflows...

How can I use "e" (Euler's number) and power operation in python 2.7

You can use exp(x) function of math library, which is same as e^x. Hence you may write your code as:

import math
x.append(1 - math.exp( -0.5 * (value1*value2)**2))

I have modified the equation by replacing 1/2 as 0.5. Else for Python <2.7, we'll have to explicitly type cast the division value to float because Python round of the result of division of two int as integer. For example: 1/2 gives 0 in python 2.7 and below.

What is the difference between encode/decode?

To represent a unicode string as a string of bytes is known as encoding. Use u'...'.encode(encoding).

Example:

    >>> u'æøå'.encode('utf8')
    '\xc3\x83\xc2\xa6\xc3\x83\xc2\xb8\xc3\x83\xc2\xa5'
    >>> u'æøå'.encode('latin1')
    '\xc3\xa6\xc3\xb8\xc3\xa5'
    >>> u'æøå'.encode('ascii')
    UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-5: 
    ordinal not in range(128)

You typically encode a unicode string whenever you need to use it for IO, for instance transfer it over the network, or save it to a disk file.

To convert a string of bytes to a unicode string is known as decoding. Use unicode('...', encoding) or '...'.decode(encoding).

Example:

   >>> u'æøå'
   u'\xc3\xa6\xc3\xb8\xc3\xa5' # the interpreter prints the unicode object like so
   >>> unicode('\xc3\xa6\xc3\xb8\xc3\xa5', 'latin1')
   u'\xc3\xa6\xc3\xb8\xc3\xa5'
   >>> '\xc3\xa6\xc3\xb8\xc3\xa5'.decode('latin1')
   u'\xc3\xa6\xc3\xb8\xc3\xa5'

You typically decode a string of bytes whenever you receive string data from the network or from a disk file.

I believe there are some changes in unicode handling in python 3, so the above is probably not correct for python 3.

Some good links:

Using Python Requests: Sessions, Cookies, and POST

I don't know how stubhub's api works, but generally it should look like this:

s = requests.Session()
data = {"login":"my_login", "password":"my_password"}
url = "http://example.net/login"
r = s.post(url, data=data)

Now your session contains cookies provided by login form. To access cookies of this session simply use

s.cookies

Any further actions like another requests will have this cookie

How would you implement an LRU cache in Java?

Have a look at ConcurrentSkipListMap. It should give you log(n) time for testing and removing an element if it is already contained in the cache, and constant time for re-adding it.

You'd just need some counter etc and wrapper element to force ordering of the LRU order and ensure recent stuff is discarded when the cache is full.

Excluding directory when creating a .tar.gz file

tar -pczf <target_file.tar.gz> --exclude /path/to/exclude --exclude /another/path/to/exclude/* /path/to/include/ /another/path/to/include/*

Tested in Ubuntu 19.10.

  1. The = after exclude is optional. You can use = instead of space after keyword exclude if you like.
  2. Parameter exclude must be placed before the source.
  3. The difference between use folder name (like the 1st) or the * (like the 2nd) is: the 2nd one will include an empty folder in package but the 1st will not.

Making a Sass mixin with optional arguments

You can always assign null to your optional arguments. Here is a simple fix

@mixin box-shadow($top, $left, $blur, $color, $inset:null) { //assigning null to inset value makes it optional
    -webkit-box-shadow: $top $left $blur $color $inset;
    -moz-box-shadow: $top $left $blur $color $inset;
    box-shadow: $top $left $blur $color $inset;
}

HTML table: keep the same width for columns

In your case, since you are only showing 3 columns:

Name    Value       Business
  or
Name    Business    Ecommerce Pro

why not set all 3 to have a width of 33.3%. since only 3 are ever shown at once, the browser should render them all a similar width.

using mailto to send email with an attachment

Nope, this is not possible at all. There is no provision for it in the mailto: protocol, and it would be a gaping security hole if it were possible.

The best idea to send a file, but have the client send the E-Mail that I can think of is:

  • Have the user choose a file
  • Upload the file to a server
  • Have the server return a random file name after upload
  • Build a mailto: link that contains the URL to the uploaded file in the message body

What's the right way to pass form element state to sibling/parent elements?

The first solution, with keeping the state in parent component, is the correct one. However, for more complex problems, you should think about some state management library, redux is the most popular one used with react.

jQuery Validate - Enable validation for hidden fields

This worked for me within an ASP.NET site. To enable validation on some hidden fields use this code

$("form").data("validator").settings.ignore = ":hidden:not(#myitem)";

To enable validation for all elements of form use this one $("form").data("validator").settings.ignore = "";

Note that use them within $(document).ready(function() { })

How do I set the background color of Excel cells using VBA?

It doesn't work if you use Function, but works if you Sub. However, you cannot call a sub from a cell using formula.

Create a file if it doesn't exist

I think this should work:

#open file for reading
fn = input("Enter file to open: ")
try:
    fh = open(fn,'r')
except:
# if file does not exist, create it
    fh = open(fn,'w')

Also, you incorrectly wrote fh = open ( fh, "w") when the file you wanted open was fn

best practice to generate random token for forgot password

The earlier version of the accepted answer (md5(uniqid(mt_rand(), true))) is insecure and only offers about 2^60 possible outputs -- well within the range of a brute force search in about a week's time for a low-budget attacker:

Since a 56-bit DES key can be brute-forced in about 24 hours, and an average case would have about 59 bits of entropy, we can calculate 2^59 / 2^56 = about 8 days. Depending on how this token verification is implemented, it might be possible to practically leak timing information and infer the first N bytes of a valid reset token.

Since the question is about "best practices" and opens with...

I want to generate identifier for forgot password

...we can infer that this token has implicit security requirements. And when you add security requirements to a random number generator, the best practice is to always use a cryptographically secure pseudorandom number generator (abbreviated CSPRNG).

Using a CSPRNG

In PHP 7, you can use bin2hex(random_bytes($n)) (where $n is an integer larger than 15).

In PHP 5, you can use random_compat to expose the same API.

Alternatively, bin2hex(mcrypt_create_iv($n, MCRYPT_DEV_URANDOM)) if you have ext/mcrypt installed. Another good one-liner is bin2hex(openssl_random_pseudo_bytes($n)).

Separating the Lookup from the Validator

Pulling from my previous work on secure "remember me" cookies in PHP, the only effective way to mitigate the aforementioned timing leak (typically introduced by the database query) is to separate the lookup from the validation.

If your table looks like this (MySQL)...

CREATE TABLE account_recovery (
    id INTEGER(11) UNSIGNED NOT NULL AUTO_INCREMENT 
    userid INTEGER(11) UNSIGNED NOT NULL,
    token CHAR(64),
    expires DATETIME,
    PRIMARY KEY(id)
);

... you need to add one more column, selector, like so:

CREATE TABLE account_recovery (
    id INTEGER(11) UNSIGNED NOT NULL AUTO_INCREMENT 
    userid INTEGER(11) UNSIGNED NOT NULL,
    selector CHAR(16),
    token CHAR(64),
    expires DATETIME,
    PRIMARY KEY(id),
    KEY(selector)
);

Use a CSPRNG When a password reset token is issued, send both values to the user, store the selector and a SHA-256 hash of the random token in the database. Use the selector to grab the hash and User ID, calculate the SHA-256 hash of the token the user provides with the one stored in the database using hash_equals().

Example Code

Generating a reset token in PHP 7 (or 5.6 with random_compat) with PDO:

$selector = bin2hex(random_bytes(8));
$token = random_bytes(32);

$urlToEmail = 'http://example.com/reset.php?'.http_build_query([
    'selector' => $selector,
    'validator' => bin2hex($token)
]);

$expires = new DateTime('NOW');
$expires->add(new DateInterval('PT01H')); // 1 hour

$stmt = $pdo->prepare("INSERT INTO account_recovery (userid, selector, token, expires) VALUES (:userid, :selector, :token, :expires);");
$stmt->execute([
    'userid' => $userId, // define this elsewhere!
    'selector' => $selector,
    'token' => hash('sha256', $token),
    'expires' => $expires->format('Y-m-d\TH:i:s')
]);

Verifying the user-provided reset token:

$stmt = $pdo->prepare("SELECT * FROM account_recovery WHERE selector = ? AND expires >= NOW()");
$stmt->execute([$selector]);
$results = $stmt->fetchAll(PDO::FETCH_ASSOC);
if (!empty($results)) {
    $calc = hash('sha256', hex2bin($validator));
    if (hash_equals($calc, $results[0]['token'])) {
        // The reset token is valid. Authenticate the user.
    }
    // Remove the token from the DB regardless of success or failure.
}

These code snippets are not complete solutions (I eschewed the input validation and framework integrations), but they should serve as an example of what to do.

If statement in aspx page

Just use simple code

<%
if(condition)
{%>

html code

<% } 
else 
{
%>
html code
<% } %>

Converting Select results into Insert script - SQL Server

Create a separate table using into statement For example

Select * into Test_123 from [dbo].[Employee] where Name like '%Test%'

Go to the Database Right Click the Database Click on Generate Script Select your table Select advanace option and select the Attribute "Data Only" Select the file "open in new query"

Sql will generate script for you

entity object cannot be referenced by multiple instances of IEntityChangeTracker. while adding related objects to entity in Entity Framework 4.1

Steps to reproduce can be simplified to this:

var contextOne = new EntityContext();
var contextTwo = new EntityContext();

var user = contextOne.Users.FirstOrDefault();

var group = new Group();
group.User = user;

contextTwo.Groups.Add(group);
contextTwo.SaveChanges();

Code without error:

var context = new EntityContext();

var user = context.Users.FirstOrDefault();

var group = new Group();
group.User = user; // Be careful when you set entity properties. 
// Be sure that all objects came from the same context

context.Groups.Add(group);
context.SaveChanges();

Using only one EntityContext can solve this. Refer to other answers for other solutions.

How do multiple clients connect simultaneously to one port, say 80, on a server?

Normally, for every connecting client the server forks a child process that communicates with the client (TCP). The parent server hands off to the child process an established socket that communicates back to the client.

When you send the data to a socket from your child server, the TCP stack in the OS creates a packet going back to the client and sets the "from port" to 80.

How to use SSH to run a local shell script on a remote machine?

This is an old question, and Jason's answer works fine, but I would like to add this:

ssh user@host <<'ENDSSH'
#commands to run on remote host
ENDSSH

This can also be used with su and commands which require user input. (note the ' escaped heredoc)

Edit: Since this answer keeps getting bits of traffic, i would add even more info to this wonderful use of heredoc:

You can nest commands with this syntax, and thats the only way nesting seems to work (in a sane way)

ssh user@host <<'ENDSSH'
#commands to run on remote host
ssh user@host2 <<'END2'
# Another bunch of commands on another host
wall <<'ENDWALL'
Error: Out of cheese
ENDWALL
ftp ftp.secureftp-test.com <<'ENDFTP'
test
test
ls
ENDFTP
END2
ENDSSH

You can actually have a conversation with some services like telnet, ftp, etc. But remember that heredoc just sends the stdin as text, it doesn't wait for response between lines

Edit: I just found out that you can indent the insides with tabs if you use <<-END !

ssh user@host <<-'ENDSSH'
    #commands to run on remote host
    ssh user@host2 <<-'END2'
        # Another bunch of commands on another host
        wall <<-'ENDWALL'
            Error: Out of cheese
        ENDWALL
        ftp ftp.secureftp-test.com <<-'ENDFTP'
            test
            test
            ls
        ENDFTP
    END2
ENDSSH

(I think this should work)

Also see http://tldp.org/LDP/abs/html/here-docs.html

Convert string to Date in java

You are wrong in the way you display the data I guess, because for me:

    String dateString = "03/26/2012 11:49:00 AM";
    SimpleDateFormat dateFormat = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss aa");
    Date convertedDate = new Date();
    try {
        convertedDate = dateFormat.parse(dateString);
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    System.out.println(convertedDate);

Prints:

Mon Mar 26 11:49:00 EEST 2012

Breaking/exit nested for in vb.net

Unfortunately, there's no exit two levels of for statement, but there are a few workarounds to do what you want:

  • Goto. In general, using goto is considered to be bad practice (and rightfully so), but using goto solely for a forward jump out of structured control statements is usually considered to be OK, especially if the alternative is to have more complicated code.

    For Each item In itemList
    For Each item1 In itemList1
        If item1.Text = "bla bla bla" Then
            Goto end_of_for
        End If
    Next
Next

end_of_for:

  • Dummy outer block

    Do
    For Each item In itemList
        For Each item1 In itemList1
            If item1.Text = "bla bla bla" Then
                Exit Do
            End If
        Next
    Next
Loop While False

    or

    Try
    For Each item In itemlist
        For Each item1 In itemlist1
            If item1 = "bla bla bla" Then
                Exit Try
            End If
        Next
    Next
Finally
End Try

  • Separate function: Put the loops inside a separate function, which can be exited with return. This might require you to pass a lot of parameters, though, depending on how many local variables you use inside the loop. An alternative would be to put the block into a multi-line lambda, since this will create a closure over the local variables.

  • Boolean variable: This might make your code a bit less readable, depending on how many layers of nested loops you have:

    Dim done = False

For Each item In itemList
    For Each item1 In itemList1
        If item1.Text = "bla bla bla" Then
            done = True
            Exit For
        End If
    Next
    If done Then Exit For
Next

WPF User Control Parent

I've found that the parent of a UserControl is always null in the constructor, but in any event handlers the parent is set correctly. I guess it must have something to do with the way the control tree is loaded. So to get around this you can just get the parent in the controls Loaded event.

For an example checkout this question WPF User Control's DataContext is Null

Spring Boot java.lang.NoClassDefFoundError: javax/servlet/Filter

That looks like you tried to add the libraries servlet.jar or servlet-api.jar into your project /lib/ folder, but Tomcat already should provide you with those libraries. Remove them from your project and classpath. Search for that anywhere in your project or classpath and remove it.

Compare string with all values in list

In Python you may use the in operator. You can do stuff like this:

>>> "c" in "abc"
True

Taking this further, you can check for complex structures, like tuples:

>>> (2, 4, 8) in ((1, 2, 3), (2, 4, 8))
True

NullPointerException: Attempt to invoke virtual method 'int java.util.ArrayList.size()' on a null object reference

Change 

 mAdapter = new RecordingsListAdapter(this, recordings);

to

 mAdapter = new RecordingsListAdapter(getActivity(), recordings);

and also make sure that recordings!=null at mAdapter = new RecordingsListAdapter(this, recordings);

No suitable driver found for 'jdbc:mysql://localhost:3306/mysql

You have to set classpath for mysql-connector.jar

In eclipse, use the build path

If you are developing any web app, you have to put mysql-connector to the lib folder of WEB-INF Directory of your web-app

Best C++ IDE or Editor for Windows

Personally, I have found Bloodshed's Dev-C++ to be very good. However, I do not recall an update in a very long time. I have, because of this, switched over to NetBeans for everything.

Refreshing data in RecyclerView and keeping its scroll position

Yes you can resolve this issue by making the adapter constructor only one time, I am explaining the coding part here :

if (appointmentListAdapter == null) {
        appointmentListAdapter = new AppointmentListAdapter(AppointmentsActivity.this);
        appointmentListAdapter.addAppointmentListData(appointmentList);
        appointmentListAdapter.setOnStatusChangeListener(onStatusChangeListener);
        appointmentRecyclerView.setAdapter(appointmentListAdapter);

    } else {
        appointmentListAdapter.addAppointmentListData(appointmentList);
        appointmentListAdapter.notifyDataSetChanged();
    }

Now you can see I have checked the adapter is null or not and only initialize when it is null.

If adapter is not null then I am assured that I have initialized my adapter at least one time.

So I will just add list to adapter and call notifydatasetchanged.

RecyclerView always holds the last position scrolled, therefore you don't have to store last position, just call notifydatasetchanged, recycler view always refresh data without going to top.

Thanks Happy Coding

How to set the size of button in HTML

Do you mean something like this?

HTML

<button class="test"></button>

CSS

.test{
    height:200px;
    width:200px;
}

If you want to use inline CSS instead of an external stylesheet, see this:

<button style="height:200px;width:200px"></button>

Validating file types by regular expression

Your regexp seems to validate both the file name and the extension. Is that what you need? I'll assume it's just the extension and would use a regexp like this:

\.(jpg|gif|doc|pdf)$

And set the matching to be case insensitive.

Automated testing for REST Api

At my work we have recently put together a couple of test suites written in Java to test some RESTful APIs we built. Our Services could invoke other RESTful APIs they depend on. We split it into two suites.

  • Suite 1 - Testing each service in isolation
    • Mock any peer services the API depends on using restito. Other alternatives include rest-driver, wiremock and betamax.
    • Tests the service we are testing and the mocks all run in a single JVM
    • Launches the service in Jetty

I would definitely recommend doing this. It has worked really well for us. The main advantages are:

  • Peer services are mocked, so you needn't perform any complicated data setup. Before each test you simply use restito to define how you want peer services to behave, just like you would with classes in unit tests with Mockito.
  • You can ask the mocked peer services if they were called. You can't do these asserts as easily with real peer services.
  • The suite is super fast as mocked services serve pre-canned in-memory responses. So we can get good coverage without the suite taking an age to run.
  • The suite is reliable and repeatable as its isolated in it's own JVM, so no need to worry about other suites/people mucking about with an shared environment at the same time the suite is running and causing tests to fail.
  • Suite 2 - Full End to End
    • Suite runs against a full environment deployed across several machines
    • API deployed on Tomcat in environment
    • Peer services are real 'as live' full deployments

This suite requires us to do data set up in peer services which means tests generally take more time to write. As much as possible we use REST clients to do data set up in peer services.

Tests in this suite usually take longer to write, so we put most of our coverage in Suite 1. That being said there is still clear value in this suite as our mocks in Suite 1 may not be behaving quite like the real services.

How do I make a dotted/dashed line in Android?

I dont know why but the voted answers don't work for me. I write it this way and works good.
Define a custom view:

public class XDashedLineView extends View {

private Paint   mPaint;
private Path    mPath;
private int     vWidth;
private int     vHeight;

public XDashedLineView(Context context) {
    super(context);
    init();
}

public XDashedLineView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
}

public XDashedLineView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
}

private void init() {
    mPaint = new Paint();
    mPaint.setColor(Color.parseColor("#3F577C"));
    mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setPathEffect(new DashPathEffect(new float[] {10,10}, 0));
    mPath = new Path();
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    this.vWidth = getMeasuredWidth();
    this.vHeight = getMeasuredHeight();
    mPath.moveTo(0, this.vHeight / 2);
    mPath.quadTo(this.vWidth / 2, this.vHeight / 2, this.vWidth, this.vHeight / 2);
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    canvas.drawPath(mPath, mPaint);
}
}

Then you can use it in your xml:

        <com.YOUR_PACKAGE_NAME.XDashedLineView
        android:layout_width="690dp"
        android:layout_height="1dp"
        android:layout_marginLeft="30dp"
        android:layout_marginTop="620dp"/>

In C can a long printf statement be broken up into multiple lines?

I don't think using one printf statement to print string literals as seen above is a good programming practice; rather, one can use the piece of code below:

printf("name: %s\t",sp->name);
printf("args: %s\t",sp->args);
printf("value: %s\t",sp->value);
printf("arraysize: %s\t",sp->name);

Using Linq to group a list of objects into a new grouped list of list of objects

 
var groupedCustomerList = userList
    .GroupBy(u => u.GroupID)
    .Select(grp => grp.ToList())
    .ToList();

How to remove gem from Ruby on Rails application?

You can use

gem uninstall <gem-name>

How to implement a Map with multiple keys?

I recommend something like this:

    public class MyMap {

      Map<Object, V> map = new HashMap<Object, V>();


      public V put(K1 key,V value){
        return map.put(key, value);
      }

      public V put(K2 key,V value){
        return map.put(key, value);
      }

      public V get(K1 key){    
        return map.get(key);
      }

      public V get(K2 key){    
        return map.get(key);
      }

      //Same for conatains

    }

Then you can use it like:
myMap.put(k1,value) or myMap.put(k2,value)

Advantages: It is simple, enforces type safety, and doesn't store repeated data (as the two maps solutions do, though still store duplicate values).
Drawbacks: Not generic.

C# generic list <T> how to get the type of T?

Given an object which I suspect to be some kind of IList<>, how can I determine of what it's an IList<>?

Here's a reliable solution. My apologies for length - C#'s introspection API makes this suprisingly difficult.

/// <summary>
/// Test if a type implements IList of T, and if so, determine T.
/// </summary>
public static bool TryListOfWhat(Type type, out Type innerType)
{
    Contract.Requires(type != null);

    var interfaceTest = new Func<Type, Type>(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IList<>) ? i.GetGenericArguments().Single() : null);

    innerType = interfaceTest(type);
    if (innerType != null)
    {
        return true;
    }

    foreach (var i in type.GetInterfaces())
    {
        innerType = interfaceTest(i);
        if (innerType != null)
        {
            return true;
        }
    }

    return false;
}

Example usage:

    object value = new ObservableCollection<int>();
Type innerType;
TryListOfWhat(value.GetType(), out innerType).Dump();
innerType.Dump();

Returns

True
typeof(Int32)

How to get the current logged in user Id in ASP.NET Core

you have to import Microsoft.AspNetCore.Identity & System.Security.Claims

// to get current user ID
var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);

// to get current user info
var user = await _userManager.FindByIdAsync(userId);

How to use the TextWatcher class in Android?

For Kotlin use KTX extension function: (It uses TextWatcher as previous answers)

yourEditText.doOnTextChanged { text, start, count, after -> 
        // action which will be invoked when the text is changing
    }


import core-KTX:

implementation "androidx.core:core-ktx:1.2.0"

How to define Singleton in TypeScript

Add the following 6 lines to any class to make it "Singleton".

class MySingleton
{
    private constructor(){ /* ... */}
    private static _instance: MySingleton;
    public static getInstance(): MySingleton
    {
        return this._instance || (this._instance = new this());
    };
}

Test example:

var test = MySingleton.getInstance(); // will create the first instance
var test2 = MySingleton.getInstance(); // will return the first instance
alert(test === test2); // true

[Edit]: Use Alex answer if you prefer to get the instance through a property rather a method.

Subtracting Number of Days from a Date in PL/SQL

Use sysdate-1 to subtract one day from system date.

select sysdate, sysdate -1 from dual;

Output:

SYSDATE  SYSDATE-1
-------- ---------
22-10-13 21-10-13

Click outside menu to close in jquery

 
$("html").click( onOutsideClick );
onOutsideClick = function( e )
{
    var t = $( e.target );
    if ( !(
        t.is("#mymenu" ) ||     //Where #mymenu - is a div container of your menu
        t.parents( "#mymenu" ).length > 0
        )   )
    {
        //TODO: hide your menu
    }
};

And better to set the listener only when your menu is being visible and always remove the listener after menu becomes hidden.

How to put img inline with text

This should display the image inline:

.content-dir-item img.mail {
    display: inline-block;
    *display: inline; /* for older IE */
    *zoom: 1; /* for older IE */
}

Unable to find the requested .Net Framework Data Provider. It may not be installed. - when following mvc3 asp.net tutorial

I had the same issue. I checked the version of System.Data.SqlServerCe in C:\Windows\assembly. It was 3.5.1.0. So I installed version 4.0.0 from below link (x86) and works fine.

http://www.microsoft.com/download/en/details.aspx?id=17876

Determine Whether Integer Is Between Two Other Integers?

There are two ways to compare three integers and check whether b is between a and c:

if a < b < c:
    pass

and

if a < b and b < c:
    pass

The first one looks like more readable, but the second one runs faster.

Let's compare using dis.dis:

>>> dis.dis('a < b and b < c')
  1           0 LOAD_NAME                0 (a)
              2 LOAD_NAME                1 (b)
              4 COMPARE_OP               0 (<)
              6 JUMP_IF_FALSE_OR_POP    14
              8 LOAD_NAME                1 (b)
             10 LOAD_NAME                2 (c)
             12 COMPARE_OP               0 (<)
        >>   14 RETURN_VALUE
>>> dis.dis('a < b < c')
  1           0 LOAD_NAME                0 (a)
              2 LOAD_NAME                1 (b)
              4 DUP_TOP
              6 ROT_THREE
              8 COMPARE_OP               0 (<)
             10 JUMP_IF_FALSE_OR_POP    18
             12 LOAD_NAME                2 (c)
             14 COMPARE_OP               0 (<)
             16 RETURN_VALUE
        >>   18 ROT_TWO
             20 POP_TOP
             22 RETURN_VALUE
>>>

and using timeit:

~$ python3 -m timeit "1 < 2 and 2 < 3"
10000000 loops, best of 3: 0.0366 usec per loop

~$ python3 -m timeit "1 < 2 < 3"
10000000 loops, best of 3: 0.0396 usec per loop

also, you may use range, as suggested before, however it is much more slower.

Setting user agent of a java URLConnection

its work for me set the User-Agent in the addRequestProperty.

URL url = new URL(<URL>);
HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();
httpConn.addRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0");

Storing Images in PostgreSQL

Try this. I've use the Large Object Binary (LOB) format for storing generated PDF documents, some of which were 10+ MB in size, in a database and it worked wonderfully.

Numpy how to iterate over columns of array?

Just iterate over the transposed of your array:

for column in array.T:
   some_function(column)

Reset push notification settings for app

On iOS 9.0.2, I'm getting the "register push notification alert" every time I delete the app and reinstall it. This is true for both AppStore production downloads and adhoc mode.

UPDATE: It is confirmed this is working for iOS 9.x

Disable Logback in SpringBoot

Correct way to exclude default logging, and configure log4j for logging.

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter</artifactId>
 <exclusions>
     <exclusion>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-logging</artifactId>
     </exclusion>
 </exclusions>
</dependency>

Refer Spring Logging - How To.

In gradle, I needed to do this with several other dependencies:

configurations {
    all*.exclude module : 'spring-boot-starter-logging'
    all*.exclude module : 'logback-classic'
}

.NET HashTable Vs Dictionary - Can the Dictionary be as fast?

System.Collections.Generic.Dictionary<TKey, TValue> and System.Collections.Hashtable classes both maintain a hash table data structure internally. None of them guarantee preserving the order of items.

Leaving boxing/unboxing issues aside, most of the time, they should have very similar performance.

The primary structural difference between them is that Dictionary relies on chaining (maintaining a list of items for each hash table bucket) to resolve collisions whereas Hashtable uses rehashing for collision resolution (when a collision occurs, tries another hash function to map the key to a bucket).

There is little benefit to use Hashtable class if you are targeting for .NET Framework 2.0+. It's effectively rendered obsolete by Dictionary<TKey, TValue>.

How can I determine whether a specific file is open in Windows?

There is a program "OpenFiles", seems to be part of windows 7. Seems that it can do what you want. It can list files opened by remote users (through file share) and, after calling "openfiles /Local on" and a system restart, it should be able to show files opened locally. The latter is said to have performance penalties.

How can I show dots ("...") in a span with hidden overflow?

You can try this:

_x000D_
_x000D_ 
.classname{_x000D_
    width:250px;_x000D_
    overflow:hidden;_x000D_
    text-overflow:ellipsis;_x000D_
}
_x000D_
_x000D_
_x000D_

The type List is not generic; it cannot be parameterized with arguments [HTTPClient]

Try to import

java.util.List;

instead of

java.awt.List;

SQL Server String Concatenation with Null

I just wanted to contribute this should someone be looking for help with adding separators between the strings, depending on whether a field is NULL or not.

So in the example of creating a one line address from separate fields

Address1, Address2, Address3, City, PostCode

in my case, I have the following Calculated Column which seems to be working as I want it:

case 
    when [Address1] IS NOT NULL 
    then (((          [Address1]      + 
          isnull(', '+[Address2],'')) +
          isnull(', '+[Address3],'')) +
          isnull(', '+[City]    ,'')) +
          isnull(', '+[PostCode],'')  
end

Hope that helps someone!

How to get current class name including package name in Java?

Use this.getClass().getCanonicalName() to get the full class name.

Note that a package / class name ("a.b.C") is different from the path of the .class files (a/b/C.class), and that using the package name / class name to derive a path is typically bad practice. Sets of class files / packages can be in multiple different class paths, which can be directories or jar files.

Getting the source of a specific image element with jQuery

To select and element where you know only the attribute value you can use the below jQuery script 

var src = $('.conversation_img[alt="example"]').attr('src');

Please refer the jQuery Documentation for attribute equals selectors

Please also refer to the example in Demo

Following is the code incase you are not able to access the demo..

HTML 

<div>
    <img alt="example" src="\images\show.jpg" />
    <img  alt="exampleAll" src="\images\showAll.jpg" />  

</div>

SCRIPT JQUERY 

var src = $('img[alt="example"]').attr('src');
alert("source of image with alternate text = example - " + src);


var srcAll = $('img[alt="exampleAll"]').attr('src');
alert("source of image with alternate text = exampleAll - " + srcAll );

Output will be

Two Alert messages each having values

  1. source of image with alternate text = example - \images\show.jpg
  2. source of image with alternate text = exampleAll - \images\showAll.jpg

How do I fix maven error The JAVA_HOME environment variable is not defined correctly?

I was facing the same issue while using mvn clean package command in Windows OS

C:\eclipse_workspace\my-sparkapp>mvn clean package
The JAVA_HOME environment variable is not defined correctly
This environment variable is needed to run this program
NB: JAVA_HOME should point to a JDK not a JRE

I resolved this issue by deleting JAVA_HOME environment variables from User Variables / System Variables then restart the laptop, then set JAVA_HOME environment variable again.

Hope it will help you.

Ruby function to remove all white spaces?

 
" Raheem Shaik ".strip

It will removes left & right side spaces. This code would give us: "Raheem Shaik"

Package name does not correspond to the file path - IntelliJ

I had this same issue, and fixed it by modifying my project's .iml file:

From:

<content url="file://$MODULE_DIR$">
  <sourceFolder url="file://$MODULE_DIR$/src/wrong/entry/here" isTestSource="false" />
  <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
  <excludeFolder url="file://$MODULE_DIR$/target" />
</content>

To:

<content url="file://$MODULE_DIR$">
  <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
  <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
  <excludeFolder url="file://$MODULE_DIR$/target" />
</content>

Somehow a package folder became specified as the root source directory when this project was imported.

How to use sessions in an ASP.NET MVC 4 application?

Try

//adding data to session
//assuming the method below will return list of Products

var products=Db.GetProducts();

//Store the products to a session

Session["products"]=products;

//To get what you have stored to a session

var products=Session["products"] as List<Product>;

//to clear the session value

Session["products"]=null;

Call a method of a controller from another controller using 'scope' in AngularJS

The best approach for you to communicate between the two controllers is to use events.

Scope Documentation

In this check out $on, $broadcast and $emit.

In general use case the usage of angular.element(catapp).scope() was designed for use outside the angular controllers, like within jquery events.

Ideally in your usage you would write an event in controller 1 as:

$scope.$on("myEvent", function (event, args) {
   $scope.rest_id = args.username;
   $scope.getMainCategories();
});

And in the second controller you'd just do

$scope.initRestId = function(){
   $scope.$broadcast("myEvent", {username: $scope.user.username });
};

Edit: Realised it was communication between two modules

Can you try including the firstApp module as a dependency to the secondApp where you declare the angular.module. That way you can communicate to the other app.

Object array initialization without default constructor

No, there isn't. New-expression only allows default initialization or no initialization at all.

The workaround would be to allocate raw memory buffer using operator new[] and then construct objects in that buffer using placement-new with non-default constructor.

Presenting a UIAlertController properly on an iPad using iOS 8

Swift 4.2 You can use condition like that:

let alert = UIAlertController(title: nil, message: nil, preferredStyle: UIDevice.current.userInterfaceIdiom == .pad ? .alert : .actionSheet)

Python 3 Float Decimal Points/Precision

The comments state the objective is to print to 2 decimal places.

There's a simple answer for Python 3:

>>> num=3.65
>>> "The number is {:.2f}".format(num)
'The number is 3.65'

or equivalently with f-strings (Python 3.6+):

>>> num = 3.65
>>> f"The number is {num:.2f}"
'The number is 3.65'

As always, the float value is an approximation:

>>> "{}".format(num)
'3.65'
>>> "{:.10f}".format(num)
'3.6500000000'
>>> "{:.20f}".format(num)
'3.64999999999999991118'

I think most use cases will want to work with floats and then only print to a specific precision.

Those that want the numbers themselves to be stored to exactly 2 decimal digits of precision, I suggest use the decimal type. More reading on floating point precision for those that are interested.

How to change border color of textarea on :focus

so simple :

 outline-color : blue !important;

the whole CSS for my react-boostrap button is:

.custom-btn {
    font-size:1.9em;
    background: #2f5bff;
    border: 2px solid #78e4ff;
    border-radius: 3px;
    padding: 50px 70px;
    outline-color : blue !important;
    text-transform: uppercase;
    user-select: auto;
    -moz-box-shadow: inset 0 0 4px rgba(0,0,0,0.2);
    -webkit-box-shadow: inset 0 0 4px rgba(0, 0, 0, 0.2);
    -webkit-border-radius: 3px;
    -moz-border-radius: 3px;
}

How to extract table as text from the PDF using Python?

If your pdf is text-based and not a scanned document (i.e. if you can click and drag to select text in your table in a PDF viewer), then you can use the module camelot-py with

import camelot
tables = camelot.read_pdf('foo.pdf')

You then can choose how you want to save the tables (as csv, json, excel, html, sqlite), and whether the output should be compressed in a ZIP archive.

tables.export('foo.csv', f='csv', compress=False)

Edit: tabula-py appears roughly 6 times faster than camelot-py so that should be used instead.

import camelot
import cProfile
import pstats
import tabula

cmd_tabula = "tabula.read_pdf('table.pdf', pages='1', lattice=True)"
prof_tabula = cProfile.Profile().run(cmd_tabula)
time_tabula = pstats.Stats(prof_tabula).total_tt

cmd_camelot = "camelot.read_pdf('table.pdf', pages='1', flavor='lattice')"
prof_camelot = cProfile.Profile().run(cmd_camelot)
time_camelot = pstats.Stats(prof_camelot).total_tt

print(time_tabula, time_camelot, time_camelot/time_tabula)

gave

1.8495559890000015 11.057014036000016 5.978199147125147

How to copy to clipboard using Access/VBA?

I couldn't figure out how to use the API using the first Google results. Fortunately a thread somewhere pointed me to this link: http://access.mvps.org/access/api/api0049.htm

Which works nicely. :)

How to use variables in SQL statement in Python?

Different implementations of the Python DB-API are allowed to use different placeholders, so you'll need to find out which one you're using -- it could be (e.g. with MySQLdb):

cursor.execute("INSERT INTO table VALUES (%s, %s, %s)", (var1, var2, var3))

or (e.g. with sqlite3 from the Python standard library):

cursor.execute("INSERT INTO table VALUES (?, ?, ?)", (var1, var2, var3))

or others yet (after VALUES you could have (:1, :2, :3) , or "named styles" (:fee, :fie, :fo) or (%(fee)s, %(fie)s, %(fo)s) where you pass a dict instead of a map as the second argument to execute). Check the paramstyle string constant in the DB API module you're using, and look for paramstyle at http://www.python.org/dev/peps/pep-0249/ to see what all the parameter-passing styles are!

Java constant examples (Create a java file having only constants)

Both are valid but I normally choose interfaces. A class (abstract or not) is not needed if there is no implementations.

As an advise, try to choose the location of your constants wisely, they are part of your external contract. Do not put every single constant in one file.

For example, if a group of constants is only used in one class or one method put them in that class, the extended class or the implemented interfaces. If you do not take care you could end up with a big dependency mess.

Sometimes an enumeration is a good alternative to constants (Java 5), take look at: http://docs.oracle.com/javase/1.5.0/docs/guide/language/enums.html

Nginx serves .php files as downloads, instead of executing them

check your nginx config file extension is *.conf.
for example: /etc/nginx/conf.d/myfoo.conf

I got the same situation. After I rename the my config file from myfoo to myfoo.conf, it fixed. Do not forget to restart nginx after rename it.

How to enable loglevel debug on Apache2 server

Edit: note that this answer is 3+ years old. For newer versions of apache, please see the answer by sp00n. Leaving this answer for users of older versions of apache.

For older version apache:

For debugging mod_rewrite issues, you'll want to use RewriteLogLevel and RewriteLog:

RewriteLogLevel 3
RewriteLog "/usr/local/var/apache/logs/rewrite.log"

How to change a particular element of a C++ STL vector

Even though @JamesMcNellis answer is a valid one I would like to explain something about error handling and also the fact that there is another way of doing what you want.

You have four ways of accessing a specific item in a vector:

  • Using the [] operator
  • Using the member function at(...)
  • Using an iterator in combination with a given offset
  • Using std::for_each from the algorithm header of the standard C++ library. This is another way which I can recommend (it uses internally an iterator). You can read more about it for example here.

In the following examples I will be using the following vector as a lab rat and explaining the first three methods:

static const int arr[] = {1, 2, 3, 4};
std::vector<int> v(arr, arr+sizeof(arr)/sizeof(arr[0]));

This creates a vector as seen below:

1 2 3 4

First let's look at the [] way of doing things. It works in pretty much the same way as you expect when working with a normal array. You give an index and possibly you access the item you want. I say possibly because the [] operator doesn't check whether the vector actually has that many items. This leads to a silent invalid memory access. Example:

v[10] = 9;

This may or may not lead to an instant crash. Worst case is of course is if it doesn't and you actually get what seems to be a valid value. Similar to arrays this may lead to wasted time in trying to find the reason why for example 1000 lines of code later you get a value of 100 instead of 234, which is somewhat connected to that very location where you retrieve an item from you vector.

A much better way is to use at(...). This will automatically check for out of bounds behaviour and break throwing an std::out_of_range. So in the case when we have

v.at(10) = 9;

We will get:

terminate called after throwing an instance of 'std::out_of_range'
what(): vector::_M_range_check: __n (which is 10) >= this->size() (which is 4)

The third way is similar to the [] operator in the sense you can screw things up. A vector just like an array is a sequence of continuous memory blocks containing data of the same type. This means that you can use your starting address by assigning it to an iterator and then just add an offset to this iterator. The offset simply stands for how many items after the first item you want to traverse:

std::vector<int>::iterator it = v.begin(); // First element of your vector
*(it+0) = 9;  // offest = 0 basically means accessing v.begin()
// Now we have 9 2 3 4 instead of 1 2 3 4
*(it+1) = -1; // offset = 1 means first item of v plus an additional one
// Now we have 9 -1 3 4 instead of 9 2 3 4
// ...

As you can see we can also do

*(it+10) = 9;

which is again an invalid memory access. This is basically the same as using at(0 + offset) but without the out of bounds error checking.

I would advice using at(...) whenever possible not only because it's more readable compared to the iterator access but because of the error checking for invalid index that I have mentioned above for both the iterator with offset combination and the [] operator.

Meaning of Choreographer messages in Logcat

This if an Info message that could pop in your LogCat on many situations.

In my case, it happened when I was inflating several views from XML layout files programmatically. The message is harmless by itself, but could be the sign of a later problem that would use all the RAM your App is allowed to use and cause the mega-evil Force Close to happen. I have grown to be the kind of Developer that likes to see his Log WARN/INFO/ERROR Free. ;)

So, this is my own experience:

I got the message:

10-09 01:25:08.373: I/Choreographer(11134): Skipped XXX frames!  The application may be doing too much work on its main thread.

... when I was creating my own custom "super-complex multi-section list" by inflating a view from XML and populating its fields (images, text, etc...) with the data coming from the response of a REST/JSON web service (without paging capabilities) this views would act as rows, sub-section headers and section headers by adding all of them in the correct order to a LinearLayout (with vertical orientation inside a ScrollView). All of that to simulate a listView with clickable elements... but well, that's for another question.

As a responsible Developer you want to make the App really efficient with the system resources, so the best practice for lists (when your lists are not so complex) is to use a ListActivity or ListFragment with a Loader and fill the ListView with an Adapter, this is supposedly more efficient, in fact it is and you should do it all the time, again... if your list is not so complex.

Solution: I implemented paging on my REST/JSON web service to prevent "big response sizes" and I wrapped the code that added the "rows", "section headers" and "sub-section headers" views on an AsyncTask to keep the Main Thread cool.

So... I hope my experience helps someone else that is cracking their heads open with this Info message.

Happy hacking!

How to convert SSH keypairs generated using PuTTYgen (Windows) into key-pairs used by ssh-agent and Keychain (Linux)

 
sudo apt-get install putty

This will automatically install the puttygen tool.

Now to convert the PPK file to be used with SSH command execute the following in terminal

puttygen mykey.ppk -O private-openssh -o my-openssh-key

Then, you can connect via SSH with:

ssh -v [email protected] -i my-openssh-key

http://www.graphicmist.in/use-your-putty-ppk-file-to-ssh-remote-server-in-ubuntu/#comment-28603

Invalid Host Header when ngrok tries to connect to React dev server

I used this set up in a react app that works. I created a config file named configstrp.js that contains the following:

module.exports = {
ngrok: {
// use the local frontend port to connect
enabled: process.env.NODE_ENV !== 'production',
port: process.env.PORT || 3000,
subdomain: process.env.NGROK_SUBDOMAIN,
authtoken: process.env.NGROK_AUTHTOKEN
},   }

Require the file in the server. 

const configstrp      = require('./config/configstrp.js');
const ngrok = configstrp.ngrok.enabled ? require('ngrok') : null;

and connect as such

if (ngrok) {
console.log('If nGronk')
ngrok.connect(
    {
    addr: configstrp.ngrok.port,
    subdomain: configstrp.ngrok.subdomain,
    authtoken: configstrp.ngrok.authtoken,
    host_header:3000
  },
  (err, url) => {
    if (err) {

    } else {

    }
   }
  );
 }

Do not pass a subdomain if you do not have a custom domain

Android EditText delete(backspace) key event

Example of creating EditText with TextWatcher

EditText someEdit=new EditText(this);
//create TextWatcher for our EditText
TextWatcher1 TW1 = new TextWatcher1(someEdit);
//apply our TextWatcher to EditText
        someEdit.addTextChangedListener(TW1);

custom TextWatcher

public class TextWatcher1 implements TextWatcher {
        public EditText editText;
//constructor
        public TextWatcher1(EditText et){
            super();
            editText = et;
//Code for monitoring keystrokes
            editText.setOnKeyListener(new View.OnKeyListener() {
                @Override
                public boolean onKey(View v, int keyCode, KeyEvent event) {
                    if(keyCode == KeyEvent.KEYCODE_DEL){
                        editText.setText("");
                    }
                        return false;
                }
            });
        }
//Some manipulation with text
        public void afterTextChanged(Editable s) {
            if(editText.getText().length() == 12){
                editText.setText(editText.getText().delete(editText.getText().length() - 1, editText.getText().length()));
                editText.setSelection(editText.getText().toString().length());
            }
            if (editText.getText().length()==2||editText.getText().length()==5||editText.getText().length()==8){
                editText.setText(editText.getText()+"/");
                editText.setSelection(editText.getText().toString().length());
            }
        }
        public void beforeTextChanged(CharSequence s, int start, int count, int after){
        }
        public void onTextChanged(CharSequence s, int start, int before, int count) {



        }
    }

Display all items in array using jquery

here is solution, i create a text field to dynamic add new items in array my html code is

_x000D_
_x000D_ 
 <input type="text" id="name">_x000D_
  <input type="button" id="btn" value="Button">_x000D_
  <div id="names">_x000D_
  </div>
_x000D_
_x000D_
_x000D_

now type any thing in text field and click on button this will add item onto array and call function dispaly_arry

_x000D_
_x000D_ 
$(document).ready(function()_x000D_
{  _x000D_
 function display_array()_x000D_
 {_x000D_
  $("#names").text('');_x000D_
  $.each(names,function(index,value)_x000D_
  {_x000D_
    $('#names').append(value + '<br/>');_x000D_
  });_x000D_
 }_x000D_
 _x000D_
 var names = ['Alex','Billi','Dale'];_x000D_
 display_array();_x000D_
 $('#btn').click(function()_x000D_
 {_x000D_
  var name = $('#name').val();_x000D_
  names.push(name);// appending value to arry _x000D_
  display_array();_x000D_
  _x000D_
 });_x000D_
 _x000D_
});_x000D_
_x000D_
_x000D_
_x000D_

showing array elements into div , you can use span but for this solution use same id .!

Replace part of a string with another string

 
std::string replace(std::string base, const std::string from, const std::string to) {
    std::string SecureCopy = base;

    for (size_t start_pos = SecureCopy.find(from); start_pos != std::string::npos; start_pos = SecureCopy.find(from,start_pos))
    {
        SecureCopy.replace(start_pos, from.length(), to);
    }

    return SecureCopy;
}

'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine

I got this error/exception in Visual Studio 2010 when I changed my build in the Configuration Manager dialog box from "x86" to "Any CPU". This OLEDB database driver I understand only works in x86 and is not 64bit compatible. Changing the build configuration back to x86 solved the problem for me.

No module named setuptools

For python3 is:

sudo apt-get install -y python3-setuptools

Is there a way to avoid null check before the for-each loop iteration starts?

Another Java 8+ way would be to create a forEach method that does not crash when using a null value:

public static <T> void forEach(Iterable<T> set, Consumer<T> action) {
    if (set != null) {
        set.forEach(action);
    }
}

The usage of the own defined foreach is close to the native Java 8 one:

ArrayList<T> list = null;

//java 8+ (will throw a NullPointerException)
list.forEach(item -> doSomething(...) );

//own implementation
forEach(list, item -> doSomething(...) );

libxml install error using pip

These two packages need to be installed separately and usually can't be installed using pip...Therefore, for FreeBSD:

Download a compressed snapshot of the Ports Collection into /var/db/portsnap:
# portsnap fetch
When running Portsnap for the first time, extract the snapshot into /usr/ports:
# portsnap extract
After the first use of Portsnap has been completed as shown above, /usr/ports can be updated as needed by running:
# portsnap fetch
# portsnap update

Now Install:
cd /usr/ports/textproc/libxml2
make install clean

cd /usr/ports/textproc/libxslt
make install clean

You should be good to go...

Is if(document.getElementById('something')!=null) identical to if(document.getElementById('something'))?

Just do it like this:

if(!document.getElementById("someId") { /Some code. Note the NOT (!) in the expresion/ };

If element with id "someId" does not exist expresion will return TRUE (NOT FALSE === TRUE) or !false === true;

try this code:

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <meta name="format-detection" content="telephone-no">
        <meta name="viewport" content="user-scalable=no, initial-scale=1, minimum-scale=1, maximum-scale=1, width=device-width, height=device-height, target-densitydpi=device-dpi">
        <title>Test</title>
    </head>
    <body>
      <script>
var createPerson = function (name) {
    var person;
    if (!document.getElementById(name)) {
        alert("Element does not exist. Let's create it.");
      person = document.createElement("div");
//add argument name as the ID of the element
      person.id = name;
//append element to the body of the document
      document.body.appendChild(person);
    } else {
        alert("Element exists. Lets get it by ID!");
      person = document.getElementById(name);
    }
    person.innerHTML = "HI THERE!";

};
//run the function.
createPerson("someid");
          </script>
       </body>
</html>

Try this in your browser and it should alert "Element does not exist. Let's create it."

Now add 

<div id="someid"></div>

to the body of the page and try again. Voila! :)

How to write logs in text file when using java.util.logging.Logger

Try this sample. It works for me.

public static void main(String[] args) {  

    Logger logger = Logger.getLogger("MyLog");  
    FileHandler fh;  

    try {  

        // This block configure the logger with handler and formatter  
        fh = new FileHandler("C:/temp/test/MyLogFile.log");  
        logger.addHandler(fh);
        SimpleFormatter formatter = new SimpleFormatter();  
        fh.setFormatter(formatter);  

        // the following statement is used to log any messages  
        logger.info("My first log");  

    } catch (SecurityException e) {  
        e.printStackTrace();  
    } catch (IOException e) {  
        e.printStackTrace();  
    }  

    logger.info("Hi How r u?");  

}

Produces the output at MyLogFile.log

Apr 2, 2013 9:57:08 AM testing.MyLogger main  
INFO: My first log  
Apr 2, 2013 9:57:08 AM testing.MyLogger main  
INFO: Hi How r u?

Edit:

To remove the console handler, use

logger.setUseParentHandlers(false);

since the ConsoleHandler is registered with the parent logger from which all the loggers derive.

Insert the same fixed value into multiple rows

What you're actually doing is adding rows. To update the content of existing rows use the UPDATE statement:

UPDATE table SET table_column = 'test';

json: cannot unmarshal object into Go value of type

Here's a fixed version of it: http://play.golang.org/p/w2ZcOzGHKR

The biggest fix that was needed is when Unmarshalling an array, that property needs to be an array/slice in the struct as well.

For example:

{ "things": ["a", "b", "c"] }

Would Unmarshal into a:

type Item struct {
    Things []string
}

And not into:

type Item struct {
    Things string
}

The other thing to watch out for when Unmarshaling is that the types line up exactly. It will fail when Unmarshalling a JSON string representation of a number into an int or float field -- "1" needs to Unmarshal into a string, not into an int like we saw with ShippingAdditionalCost int

How can I copy the output of a command directly into my clipboard?

Add this to to your ~/.bashrc:

# Now `cclip' copies and `clipp' pastes'
alias cclip='xclip -selection clipboard'
alias clipp='xclip -selection clipboard -o'

Now clipp pastes and cclip copies — but you can also do fancier stuff:

clipp | sed 's/^/    /' | cclip

↑ indents your clipboard; good for sites without stack overflow's { } button

You can add it by running this:

printf "\nalias clipp=\'xclip -selection c -o\'\n" >> ~/.bashrc
printf "\nalias cclip=\'xclip -selection c -i\'\n" >> ~/.bashrc

Table header to stay fixed at the top when user scrolls it out of view with jQuery

I've tried most of these solutions, and eventually found (IMO) the best, modern, solution:

CSS grids

With CSS grids, you can define a 'grid', and you can finally create a nice, javascript-free, cross-browser solution for a table with a fixed header, and scrollable content. The header height can even dynamic.

CSS: Display as grid, and set the number of template-rows:

.grid {
    display: grid;
    grid-template-rows: 50px auto; // For fixed height header
    grid-template-rows: auto auto; // For dynamic height header
}

HTML: Create a grid container and the number of defined rows:

<div class="grid">
    <div></div>
    <div></div>
</div>

Here is working example:

CSS

body {
  margin: 0px;
  padding: 0px;
  text-align: center;
}

.table {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-rows: 50px auto;
}
.table-heading {
  background-color: #ddd;
}
.table-content {
  overflow-x: hidden;
  overflow-y: scroll;
}

HTML

<html>
    <head>
    </head>
    <body>
        <div class="table">
            <div class="table-heading">
                HEADING
            </div>
            <div class="table-content">
                CONTENT - CONTENT - CONTENT <br/>
                CONTENT - CONTENT - CONTENT <br/>
                CONTENT - CONTENT - CONTENT <br/>
                CONTENT - CONTENT - CONTENT <br/>
                CONTENT - CONTENT - CONTENT <br/>
                CONTENT - CONTENT - CONTENT <br/>
            </div>
        </div>
    </body>
</html>

pip installation /usr/local/opt/python/bin/python2.7: bad interpreter: No such file or directory

TLDR: pip found in your path a is a symlink and the referenced location no longer contains the executable. You need to update the symlink.

It helps to understand a couple of things.

  • When you type something like python or pip you os will search /etc/paths to try to find the associated executable for that command. You can see everything in there by using cat /etc/paths.
  • To determine the location of the executable that your shell will use there is a handy command which, you can type which python or which pip. This will tell you the location of the executable that your shell will use for that command.
  • This part is key. The location may or may not be an actual executable, it could be a symbolic link (symlink).
  • Its common for /etc/paths to contain /usr/local/bin, its also common for /usr/local/bin to be a bunch of symlinks to the actual executables. Not the executables themselves.
  • If the executable at the symlinks referenced location doesn't exist you will get an error like bad interpreter: No such file or directory

With that being said the problem is likely that pip is a symlink and the linked executable probably doesn't exist at that location anymore. To fix it do the following

  1. Find the location of the executable - which pip (gives something like this /usr/local/bin/pip)
  2. Check the symlink reference location ls -l /usr/local/bin/pip | grep pip (give something like this pip -> /usr/local/opt/[email protected]/bin/pip3)
  3. Check if the executable exists at the referenced location ls /usr/local/opt/[email protected]/bin/pip3 (you are having this issue so it probably doesn't).
  4. Remove the old symlink rm -r /usr/local/bin/pip
  5. Find the actual pip executable if using homebrew it will be in /usr/local/opt you can use something like ls /usr/local/opt/ | grep python to find it.
  6. Add the right symlink for the pip executable. ln -s /usr/local/opt/[email protected]/bin/pip3 /usr/local/bin/pip

What is web.xml file and what are all things can I do with it?

If using Struts, we disable direct access to the JSP files by using this tag in web.xml

 <security-constraint>
<web-resource-collection>
  <web-resource-name>no_access</web-resource-name>
  <url-pattern>*.jsp</url-pattern>
</web-resource-collection>
<auth-constraint/>

How to order citations by appearance using BibTeX?

Just a brief note - I'm using a modified version of plain.bst sitting in the directory with my Latex files; it turns out having sorting by order of appearance is a relatively easy change; just find the piece of code: 

...
ITERATE {presort}

SORT
...

... and comment it - I turned it to: 

...
%% % avoid sort:
%% ITERATE {presort}
%%
%% SORT
...

... and then, after running bibtex, pdflatex, pdflatex - the citations will be sorted by order of appearance (that is, they will be unsorted :) ).

Cheers!

EDIT: just realized that what I wrote is actually in the comment by @ChrisN: "can you edit it to remove the SORT command" ;)

Check if string has space in between (or anywhere)

How about:

myString.Any(x => Char.IsWhiteSpace(x))

Or if you like using the "method group" syntax:

myString.Any(Char.IsWhiteSpace)

Visual Studio: Relative Assembly References Paths

I might be off here, but it seems that the answer is quite obvious: Look at reference paths in the project properties. In our setup I added our common repository folder, to the ref path GUI window, like so

Reference Paths in VS20xx

That way I can copy my dlls (ready for publish) to this folder and every developer now gets the updated DLL every time it builds from this folder.

If the dll is found in the Solution, the builder should prioritize the local version over the published team version.

How to use the "required" attribute with a "radio" input field

I had to use required="required" along with the same name and type, and then validation worked fine.

<input type="radio" name="user-radio"  id="" value="User" required="required" />

<input type="radio" name="user-radio" id="" value="Admin" />

<input type="radio" name="user-radio" id="" value="Guest" />

How to Handle Button Click Events in jQuery?

 
$(document).ready(function(){

     $('your selector').bind("click",function(){
            // your statements;
     });

     // you can use the above or the one shown below

     $('your selector').click(function(e){
         e.preventDefault();
         // your statements;
     });


});

use Lodash to sort array of object by value

You can use lodash sortBy (https://lodash.com/docs/4.17.4#sortBy).

Your code could be like:

const myArray = [  
   {  
      "id":25,
      "name":"Anakin Skywalker",
      "createdAt":"2017-04-12T12:48:55.000Z",
      "updatedAt":"2017-04-12T12:48:55.000Z"
   },
   {  
      "id":1,
      "name":"Luke Skywalker",
      "createdAt":"2017-04-12T11:25:03.000Z",
      "updatedAt":"2017-04-12T11:25:03.000Z"
   }
]

const myOrderedArray = _.sortBy(myArray, o => o.name)

Set Icon Image in Java

Use Default toolkit for this

frame.setIconImage(Toolkit.getDefaultToolkit().getImage("Icon.png"));

How to update and delete a cookie?

http://www.quirksmode.org/js/cookies.html

update would just be resetting it using createCookie

function createCookie(name,value,days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days * 24 * 60 * 60 *1000));
        var expires = "; expires=" + date.toGMTString();
    } else {
        var expires = "";
    }
    document.cookie = name + "=" + value + expires + "; path=/";
}

function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') {
            c = c.substring(1,c.length);
        }
        if (c.indexOf(nameEQ) == 0) {
            return c.substring(nameEQ.length,c.length);
        }
    }
    return null;
}

function eraseCookie(name) {
    createCookie(name,"",-1);
}

How to return a boolean method in java?

You can also do this, for readability's sake

boolean passwordVerified=(pword.equals(pwdRetypePwd.getText());

if(!passwordVerified ){
    txtaError.setEditable(true);
    txtaError.setText("*Password didn't match!");
    txtaError.setForeground(Color.red);
    txtaError.setEditable(false);
}else{
    addNewUser();
}
return passwordVerified;

How to get unique values in an array

 
Array.prototype.unique = function () {
    var dictionary = {};
    var uniqueValues = [];
    for (var i = 0; i < this.length; i++) {
        if (dictionary[this[i]] == undefined){
            dictionary[this[i]] = i;
            uniqueValues.push(this[i]);
        }
    }
    return uniqueValues; 
}

An unhandled exception of type 'System.TypeInitializationException' occurred in EntityFramework.dll

I had this issue when i refereed a library project from a console application, and the library project was using a nuget package which is not refereed in the console application. Referring the same package in the console application helped to resolve this issue.

Seeing the Inner exception can help.

Appending an id to a list if not already present in a string

7 years later, allow me to give a one-liner solution by building on a previous answer. You could do the followwing:

numbers = [1, 2, 3]

to Add [3, 4, 5] into numbers without repeating 3, do the following:

numbers = list(set(numbers + [3, 4, 5]))

This results in 4 and 5 being added to numbers as in [1, 2, 3, 4, 5]

Explanation:

Now let me explain what happens, starting from the inside of the set() instruction, we took numbers and added 3, 4, and 5 to it which makes numbers look like [1, 2, 3, 3, 4, 5]. Then, we took that ([1, 2, 3, 3, 4, 5]) and transformed it into a set which gets rid of duplicates, resulting in the following {1, 2, 3, 4, 5}. Now since we wanted a list and not a set, we used the function list() to make that set ({1, 2, 3, 4, 5}) into a list, resulting in [1, 2, 3, 4, 5] which we assigned to the variable numbers

This, I believe, will work for all types of data in a list, and objects as well if done correctly.

Android Percentage Layout Height

android:layout_weight=".YOURVALUE" is best way to implement in percentage

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/logTextBox"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight=".20"
        android:maxLines="500"
        android:scrollbars="vertical"
        android:singleLine="false"
        android:text="@string/logText" >
    </TextView>

</LinearLayout>

How do I hide the PHP explode delimiter from submitted form results?

Instead of adding the line breaks with nl2br() and then removing the line breaks with explode(), try using the line break character '\r' or '\n' or '\r\n'. 

<?php     $options= file_get_contents("employees.txt");     $options=explode("\n",$options);        // try \r as well.      foreach ($options as $singleOption){         echo "<option value='".$singleOption."'>".$singleOption."</option>";     }   ?>

This could also fix the issue if the problem was due to Google Spreadsheets reading the line breaks.

How can I solve equations in Python?

If you only want to solve the extremely limited set of equations mx + c = y for positive integer m, c, y, then this will do:

import re
def solve_linear_equation ( equ ):
    """
    Given an input string of the format "3x+2=6", solves for x.
    The format must be as shown - no whitespace, no decimal numbers,
    no negative numbers.
    """
    match = re.match(r"(\d+)x\+(\d+)=(\d+)", equ)
    m, c, y = match.groups()
    m, c, y = float(m), float(c), float(y) # Convert from strings to numbers
    x = (y-c)/m
    print ("x = %f" % x)

Some tests:

>>> solve_linear_equation("2x+4=12")
x = 4.000000
>>> solve_linear_equation("123x+456=789")
x = 2.707317
>>>

If you want to recognise and solve arbitrary equations, like sin(x) + e^(i*pi*x) = 1, then you will need to implement some kind of symbolic maths engine, similar to maxima, Mathematica, MATLAB's solve() or Symbolic Toolbox, etc. As a novice, this is beyond your ken.

Error: JAVA_HOME is not defined correctly executing maven

$JAVA_HOME should be the directory where java was installed, not one of its parts:

export JAVA_HOME=/usr/lib/jvm/java-7-oracle

How can I force gradle to redownload dependencies?

One can remove folder with cached jars.

In my case, on Mac the library was cached at path:

/Users/MY_NAME/.gradle/caches/modules-2/files-2.1/cached-library-to-remove

I removed the cached library folder ("cached-library-to-remove" in above example), deleted the build folder of my project and compiled again. Fresh library was downloaded then.

How to get the device's IMEI/ESN programmatically in android?

Try this(need to get first IMEI always)

TelephonyManager mTelephony = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        if (ActivityCompat.checkSelfPermission(LoginActivity.this,Manifest.permission.READ_PHONE_STATE)!= PackageManager.PERMISSION_GRANTED) {

         return;
}

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                if (mTelephony.getPhoneCount() == 2) {
                    IME = mTelephony.getImei(0);
                }else{
                    IME = mTelephony.getImei();
                }
            }else{
                if (mTelephony.getPhoneCount() == 2) {
                    IME = mTelephony.getDeviceId(0);
                } else {
                    IME = mTelephony.getDeviceId();
                }
            }
        } else {
            IME = mTelephony.getDeviceId();
        }

How do I do redo (i.e. "undo undo") in Vim?

Using VsVim for Visual Studio?

I came across this when experimenting with VsVim, which provides bindings for Vim commands in Visual Studio.

I know about Ctrlr in Vim itself, but this particular binding does not work in VsVim (at least not in my setup?).

What does work however, is the command :red. This is a little bit more of a hassle than the above, but it is still fine when you really need it.

Do you have to put Task.Run in a method to make it async?

When you use Task.Run to run a method, Task gets a thread from threadpool to run that method. So from the UI thread's perspective, it is "asynchronous" as it doesn't block UI thread.This is fine for desktop application as you usually don't need many threads to take care of user interactions.

However, for web application each request is serviced by a thread-pool thread and thus the number of active requests can be increased by saving such threads. Frequently using threadpool threads to simulate async operation is not scalable for web applications.

True Async doesn't necessarily involving using a thread for I/O operations, such as file / DB access etc. You can read this to understand why I/O operation doesn't need threads. http://blog.stephencleary.com/2013/11/there-is-no-thread.html

In your simple example,it is a pure CPU-bound calculation, so using Task.Run is fine.

Twitter Bootstrap date picker

The most popular bootstrap date picker is currently: https://github.com/eternicode/bootstrap-datepicker (thanks to @dentarg for digging it up)

A simple instantiation only requires:

HTML

<input class="datepicker">

Javascript

$('.datepicker').datepicker();

See a simple example here https://jsfiddle.net/k6qsm5no/1/ or the full docs here http://bootstrap-datepicker.readthedocs.org/en/latest/

Jquery Hide table rows

$('inputFile').parent().parent().children('td > label').hide();

can help you navigate two levels up ( to TD, to TR ) moving two levels back down ( all TD's in that TR and their LABEL tags ), applying the hide() function there.

if you want to stay at the TR level and hide them:

$('inputFile').parent().parent().hide();

… is sufficient.

you can navigate very easily through the elements using the jquery selectors.

parent is documented here: http://api.jquery.com/parent/

hide is documented here: http://api.jquery.com/hide/

How to disable Paste (Ctrl+V) with jQuery?

_x000D_
_x000D_ 
 $(document).ready(function(){_x000D_
   $('#txtInput').on("cut copy paste",function(e) {_x000D_
      e.preventDefault();_x000D_
   });_x000D_
});
_x000D_ 
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
    <input type="text" id="txtInput" />
_x000D_
_x000D_
_x000D_

Run exe file with parameters in a batch file

If you need to see the output of the execute, use CALL together with or instead of START.

Example:

CALL "C:\Program Files\Certain Directory\file.exe" -param PAUSE

This will run the file.exe and print back whatever it outputs, in the same command window. Remember the PAUSE after the call or else the window may close instantly.

Relative imports for the billionth time

Script vs. Module

Here's an explanation. The short version is that there is a big difference between directly running a Python file, and importing that file from somewhere else. Just knowing what directory a file is in does not determine what package Python thinks it is in. That depends, additionally, on how you load the file into Python (by running or by importing).

There are two ways to load a Python file: as the top-level script, or as a module. A file is loaded as the top-level script if you execute it directly, for instance by typing python myfile.py on the command line. It is loaded as a module if you do python -m myfile, or if it is loaded when an import statement is encountered inside some other file. There can only be one top-level script at a time; the top-level script is the Python file you ran to start things off.

Naming

When a file is loaded, it is given a name (which is stored in its __name__ attribute). If it was loaded as the top-level script, its name is __main__. If it was loaded as a module, its name is the filename, preceded by the names of any packages/subpackages of which it is a part, separated by dots.

So for instance in your example:

package/
    __init__.py
    subpackage1/
        __init__.py
        moduleX.py
    moduleA.py

if you imported moduleX (note: imported, not directly executed), its name would be package.subpackage1.moduleX. If you imported moduleA, its name would be package.moduleA. However, if you directly run moduleX from the command line, its name will instead be __main__, and if you directly run moduleA from the command line, its name will be __main__. When a module is run as the top-level script, it loses its normal name and its name is instead __main__.

Accessing a module NOT through its containing package

There is an additional wrinkle: the module's name depends on whether it was imported "directly" from the directory it is in, or imported via a package. This only makes a difference if you run Python in a directory, and try to import a file in that same directory (or a subdirectory of it). For instance, if you start the Python interpreter in the directory package/subpackage1 and then do import moduleX, the name of moduleX will just be moduleX, and not package.subpackage1.moduleX. This is because Python adds the current directory to its search path on startup; if it finds the to-be-imported module in the current directory, it will not know that that directory is part of a package, and the package information will not become part of the module's name.

A special case is if you run the interpreter interactively (e.g., just type python and start entering Python code on the fly). In this case the name of that interactive session is __main__.

Now here is the crucial thing for your error message: if a module's name has no dots, it is not considered to be part of a package. It doesn't matter where the file actually is on disk. All that matters is what its name is, and its name depends on how you loaded it.

Now look at the quote you included in your question:

Relative imports use a module's name attribute to determine that module's position in the package hierarchy. If the module's name does not contain any package information (e.g. it is set to 'main') then relative imports are resolved as if the module were a top level module, regardless of where the module is actually located on the file system.

Relative imports...

Relative imports use the module's name to determine where it is in a package. When you use a relative import like from .. import foo, the dots indicate to step up some number of levels in the package hierarchy. For instance, if your current module's name is package.subpackage1.moduleX, then ..moduleA would mean package.moduleA. For a from .. import to work, the module's name must have at least as many dots as there are in the import statement.

... are only relative in a package

However, if your module's name is __main__, it is not considered to be in a package. Its name has no dots, and therefore you cannot use from .. import statements inside it. If you try to do so, you will get the "relative-import in non-package" error.

Scripts can't import relative

What you probably did is you tried to run moduleX or the like from the command line. When you did this, its name was set to __main__, which means that relative imports within it will fail, because its name does not reveal that it is in a package. Note that this will also happen if you run Python from the same directory where a module is, and then try to import that module, because, as described above, Python will find the module in the current directory "too early" without realizing it is part of a package.

Also remember that when you run the interactive interpreter, the "name" of that interactive session is always __main__. Thus you cannot do relative imports directly from an interactive session. Relative imports are only for use within module files.

Two solutions:

  1. If you really do want to run moduleX directly, but you still want it to be considered part of a package, you can do python -m package.subpackage1.moduleX. The -m tells Python to load it as a module, not as the top-level script.

  2. Or perhaps you don't actually want to run moduleX, you just want to run some other script, say myfile.py, that uses functions inside moduleX. If that is the case, put myfile.py somewhere else – not inside the package directory – and run it. If inside myfile.py you do things like from package.moduleA import spam, it will work fine.

Notes

  • For either of these solutions, the package directory (package in your example) must be accessible from the Python module search path (sys.path). If it is not, you will not be able to use anything in the package reliably at all.

  • Since Python 2.6, the module's "name" for package-resolution purposes is determined not just by its __name__ attributes but also by the __package__ attribute. That's why I'm avoiding using the explicit symbol __name__ to refer to the module's "name". Since Python 2.6 a module's "name" is effectively __package__ + '.' + __name__, or just __name__ if __package__ is None.)

Two div blocks on same line

CSS:

#block_container
{
    text-align:center;
}
#bloc1, #bloc2
{
    display:inline;
}

HTML

<div id="block_container">

    <div id="bloc1"><?php echo " version ".$version." Copyright &copy; All Rights Reserved."; ?></div>  
    <div id="bloc2"><img src="..."></div>

</div>

Also, you shouldn't put raw content into <div>'s, use an appropriate tag such as <p> or <span>.

Edit: Here is a jsFiddle demo.

What can cause a “Resource temporarily unavailable” on sock send() command

"Resource temporarily unavailable" is the error message corresponding to EAGAIN, which means that the operation would have blocked but nonblocking operation was requested. For send(), that could be due to any of:

  • explicitly marking the file descriptor as nonblocking with fcntl(); or
  • passing the MSG_DONTWAIT flag to send(); or
  • setting a send timeout with the SO_SNDTIMEO socket option.

What is VanillaJS?

VanillaJS is a term for library/framework free javascript.

Its sometimes ironically referred to as a library, as a joke for people who could be seen as mindlessly using different frameworks, especially jQuery.

Some people have gone so far to release this library, usually with an empty or comment-only js file.

Excel to JSON javascript code?

js-xlsx library makes it easy to convert Excel/CSV files into JSON objects.

Download the xlsx.full.min.js file from here. Write below code on your HTML page Edit the referenced js file link (xlsx.full.min.js) and link of Excel file

<!doctype html>
<html>

<head>
    <title>Excel to JSON Demo</title>
    <script src="xlsx.full.min.js"></script>
</head>

<body>

    <script>
        /* set up XMLHttpRequest */
        var url = "http://myclassbook.org/wp-content/uploads/2017/12/Test.xlsx";
        var oReq = new XMLHttpRequest();
        oReq.open("GET", url, true);
        oReq.responseType = "arraybuffer";

        oReq.onload = function(e) {
            var arraybuffer = oReq.response;

            /* convert data to binary string */
            var data = new Uint8Array(arraybuffer);
            var arr = new Array();
            for (var i = 0; i != data.length; ++i) arr[i] = String.fromCharCode(data[i]);
            var bstr = arr.join("");

            /* Call XLSX */
            var workbook = XLSX.read(bstr, {
                type: "binary"
            });

            /* DO SOMETHING WITH workbook HERE */
            var first_sheet_name = workbook.SheetNames[0];
            /* Get worksheet */
            var worksheet = workbook.Sheets[first_sheet_name];
            console.log(XLSX.utils.sheet_to_json(worksheet, {
                raw: true
            }));
        }

        oReq.send();
    </script>
</body>
</html>

Input:
Click here to see the input Excel file

Output:
Click here to see the output of above code

Reporting Services permissions on SQL Server R2 SSRS

If this still isn't working try unchecking "Enable Protected Mode" in IE.
Add your site to Local Intranet in Tools -> Internet Option -> Security Tab Then uncheck "Enable Protected Mode" Restart IE

How to use Git?

I really like the O'Reilly book "Version Control with Git". I read it cover-to-cover and now I'm very comfortable with advanced git topics.

How can I close a dropdown on click outside?

If you are using Bootstrap, you can do it directly with bootstrap way via dropdowns (Bootstrap component).

<div class="input-group">
    <div class="input-group-btn">
        <button aria-expanded="false" aria-haspopup="true" class="btn btn-default dropdown-toggle" data-toggle="dropdown" type="button">
            Toggle Drop Down. <span class="fa fa-sort-alpha-asc"></span>
        </button>
        <ul class="dropdown-menu">
            <li>List 1</li>
            <li>List 2</li>
            <li>List 3</li>
        </ul>
    </div>
</div>

Now it's OK to put (click)="clickButton()" stuff on the button. http://getbootstrap.com/javascript/#dropdowns

Select n random rows from SQL Server table

Depending on your needs, TABLESAMPLE will get you nearly as random and better performance. this is available on MS SQL server 2005 and later.

TABLESAMPLE will return data from random pages instead of random rows and therefore deos not even retrieve data that it will not return.

On a very large table I tested 

select top 1 percent * from [tablename] order by newid()

took more than 20 minutes.

select * from [tablename] tablesample(1 percent)

took 2 minutes.

Performance will also improve on smaller samples in TABLESAMPLE whereas it will not with newid().

Please keep in mind that this is not as random as the newid() method but will give you a decent sampling.

See the MSDN page.

How do I clone a job in Jenkins?

if you want to copy in same Jenkins but in different subfolders, create new item -> use copy from. new Job will be cloned in same directory. Then use move option to move it in desired directory

How do you create a UIImage View Programmatically - Swift

This answer is update to Swift 3.

This is how you can add an image view programmatically where you can control the constraints.

Class ViewController: UIViewController {

    let someImageView: UIImageView = {
       let theImageView = UIImageView()
       theImageView.image = UIImage(named: "yourImage.png")
       theImageView.translatesAutoresizingMaskIntoConstraints = false //You need to call this property so the image is added to your view
       return theImageView
    }()

    override func viewDidLoad() {
       super.viewDidLoad()

       view.addSubview(someImageView) //This add it the view controller without constraints
       someImageViewConstraints() //This function is outside the viewDidLoad function that controls the constraints
    }

    // do not forget the `.isActive = true` after every constraint
    func someImageViewConstraints() {
        someImageView.widthAnchor.constraint(equalToConstant: 180).isActive = true
        someImageView.heightAnchor.constraint(equalToConstant: 180).isActive = true
        someImageView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        someImageView.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: 28).isActive = true
    }

}

How to set the max size of upload file

You need to set the multipart.maxFileSize and multipart.maxRequestSize parameters to higher values than the default. This can be done in your spring boot configuration yml files. For example, adding the following to application.yml will allow users to upload 10Mb files:

multipart:
    maxFileSize: 10Mb
    maxRequestSize: 10Mb

If the user needs to be able to upload multiple files in a single request and they may total more than 10Mb, then you will need to configure multipart.maxRequestSize to a higher value:

multipart:
    maxFileSize: 10Mb
    maxRequestSize: 100Mb

Source: https://spring.io/guides/gs/uploading-files/

PHP MySQL Google Chart JSON - Complete Example

Some might encounter this error either locally or on the server:

syntax error var data = new google.visualization.DataTable(<?=$jsonTable?>);

This means that their environment does not support short tags the solution is to use this instead:

<?php echo $jsonTable; ?>

And everything should work fine!

Creating an Arraylist of Objects

If you want to allow a user to add a bunch of new MyObjects to the list, you can do it with a for loop: Let's say I'm creating an ArrayList of Rectangle objects, and each Rectangle has two parameters- length and width.

//here I will create my ArrayList:

ArrayList <Rectangle> rectangles= new ArrayList <>(3); 

int length;
int width;

for(int index =0; index <3;index++)
{JOptionPane.showMessageDialog(null, "Rectangle " + (index + 1));
 length = JOptionPane.showInputDialog("Enter length");
 width = JOptionPane.showInputDialog("Enter width");

 //Now I will create my Rectangle and add it to my rectangles ArrayList:

 rectangles.add(new Rectangle(length,width));

//This passes the length and width values to the rectangle constructor,
  which will create a new Rectangle and add it to the ArrayList.

}

how to read xml file from url using php

$url = 'http://www.example.com'; $xml = simpleXML_load_file($url,"SimpleXMLElement",LIBXML_NOCDATA);

$url can be php file, as long as the file generate xml format data as output.

Using sed to mass rename files

I wrote a small post with examples on batch renaming using sed couple of years ago:

http://www.guyrutenberg.com/2009/01/12/batch-renaming-using-sed/

For example:

for i in *; do
  mv "$i" "`echo $i | sed "s/regex/replace_text/"`";
done

If the regex contains groups (e.g. \(subregex\) then you can use them in the replacement text as \1\,\2 etc.

How to use Ajax.ActionLink?

Sure, a very similar question was asked before. Set the controller for ajax requests:

public ActionResult Show()
{
    if (Request.IsAjaxRequest()) 
    {
        return PartialView("Your_partial_view", new Model());
    }
    else 
    {
        return View();
    }
}

Set the action link as wanted:

@Ajax.ActionLink("Show", 
                 "Show", 
                 null, 
                 new AjaxOptions { HttpMethod = "GET", 
                 InsertionMode = InsertionMode.Replace, 
                 UpdateTargetId = "dialog_window_id", 
                 OnComplete = "your_js_function();" })

Note that I'm using Razor view engine, and that your AjaxOptions may vary depending on what you want. Finally display it on a modal window. The jQuery UI dialog is suggested.

You have not concluded your merge (MERGE_HEAD exists)

OK. The problem is your previous pull failed to merge automatically and went to conflict state. And the conflict wasn't resolved properly before the next pull.

  1. Undo the merge and pull again.

    To undo a merge:

    git merge --abort [Since git version 1.7.4]

    git reset --merge [prior git versions]

  2. Resolve the conflict.

  3. Don't forget to add and commit the merge.

  4. git pull now should work fine.

How to add a color overlay to a background image?

Try this, it's simple and clear. I have found it from here : https://css-tricks.com/tinted-images-multiple-backgrounds/

.tinted-image {

  width: 300px;
  height: 200px;

  background: 
    /* top, transparent red */ 
    linear-gradient(
      rgba(255, 0, 0, 0.45), 
      rgba(255, 0, 0, 0.45)
    ),
    /* bottom, image */
    url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/3/owl1.jpg);
}

How to find and turn on USB debugging mode on Nexus 4

Looking for About Phone in Settings. And scroll down till you see Build number. Tap here till you see Toast message tell you have just enable developer mode.

Back to settings, you can see options: "Developer options"

How do I get next month date from today's date and insert it in my database?

If you want a specific date in next month, you can do this:

// Calculate the timestamp
$expire = strtotime('first day of +1 month');

// Format the timestamp as a string
echo date('m/d/Y', $expire);

Note that this actually works more reliably where +1 month can be confusing. For example...

Current Day   | first day of +1 month     | +1 month
---------------------------------------------------------------------------
2015-01-01    | 2015-02-01                | 2015-02-01
2015-01-30    | 2015-02-01                | 2015-03-02  (skips Feb)
2015-01-31    | 2015-02-01                | 2015-03-03  (skips Feb)
2015-03-31    | 2015-04-01                | 2015-05-01  (skips April)
2015-12-31    | 2016-01-01                | 2016-01-31

Difference between RUN and CMD in a Dockerfile

RUN - Install Python , your container now has python burnt into its image
CMD - python hello.py , run your favourite script

SQL Inner join 2 tables with multiple column conditions and update

You need to do

Update table_xpto
set column_xpto = x.xpto_New
    ,column2 = x.column2New
from table_xpto xpto
   inner join table_xptoNew xptoNew ON xpto.bla = xptoNew.Bla
where <clause where>

If you need a better answer, you can give us more information :)

The SELECT permission was denied on the object 'sysobjects', database 'mssqlsystemresource', schema 'sys'

In my case, simply giving the user permissions on the database fixed it.

So Right click on the database -> Click Properties -> [left hand menu] Click Permissions -> and scroll down to Backup database -> Tick "Grant"

Angular2 *ngFor in select list, set active based on string from object

This should work 

<option *ngFor="let title of titleArray" 
    [value]="title.Value" 
    [attr.selected]="passenger.Title==title.Text ? true : null">
  {{title.Text}}
</option>

I'm not sure the attr. part is necessary.

Python & Matplotlib: Make 3D plot interactive in Jupyter Notebook

A solution I came up with is to use a vis.js instance in an iframe. This shows an interactive 3D plot inside a notebook, which still works in nbviewer. The visjs code is borrowed from the example code on the 3D graph page

A small notebook to illustrate this: demo

The code itself:

from IPython.core.display import display, HTML
import json

def plot3D(X, Y, Z, height=600, xlabel = "X", ylabel = "Y", zlabel = "Z", initialCamera = None):

    options = {
        "width": "100%",
        "style": "surface",
        "showPerspective": True,
        "showGrid": True,
        "showShadow": False,
        "keepAspectRatio": True,
        "height": str(height) + "px"
    }

    if initialCamera:
        options["cameraPosition"] = initialCamera

    data = [ {"x": X[y,x], "y": Y[y,x], "z": Z[y,x]} for y in range(X.shape[0]) for x in range(X.shape[1]) ]
    visCode = r"""
       <link href="https://cdnjs.cloudflare.com/ajax/libs/vis/4.21.0/vis.min.css" type="text/css" rel="stylesheet" />
       <script src="https://cdnjs.cloudflare.com/ajax/libs/vis/4.21.0/vis.min.js"></script>
       <div id="pos" style="top:0px;left:0px;position:absolute;"></div>
       <div id="visualization"></div>
       <script type="text/javascript">
        var data = new vis.DataSet();
        data.add(""" + json.dumps(data) + """);
        var options = """ + json.dumps(options) + """;
        var container = document.getElementById("visualization");
        var graph3d = new vis.Graph3d(container, data, options);
        graph3d.on("cameraPositionChange", function(evt)
        {
            elem = document.getElementById("pos");
            elem.innerHTML = "H: " + evt.horizontal + "<br>V: " + evt.vertical + "<br>D: " + evt.distance;
        });
       </script>
    """
    htmlCode = "<iframe srcdoc='"+visCode+"' width='100%' height='" + str(height) + "px' style='border:0;' scrolling='no'> </iframe>"
    display(HTML(htmlCode))

How to remove \xa0 from string in Python?

After trying several methods, to summarize it, this is how I did it. Following are two ways of avoiding/removing \xa0 characters from parsed HTML string.

Assume we have our raw html as following:

raw_html = '<p>Dear Parent, </p><p><span style="font-size: 1rem;">This is a test message, </span><span style="font-size: 1rem;">kindly ignore it. </span></p><p><span style="font-size: 1rem;">Thanks</span></p>'

So lets try to clean this HTML string:

from bs4 import BeautifulSoup
raw_html = '<p>Dear Parent, </p><p><span style="font-size: 1rem;">This is a test message, </span><span style="font-size: 1rem;">kindly ignore it. </span></p><p><span style="font-size: 1rem;">Thanks</span></p>'
text_string = BeautifulSoup(raw_html, "lxml").text
print text_string
#u'Dear Parent,\xa0This is a test message,\xa0kindly ignore it.\xa0Thanks'

The above code produces these characters \xa0 in the string. To remove them properly, we can use two ways.

Method # 1 (Recommended): The first one is BeautifulSoup's get_text method with strip argument as True So our code becomes:

clean_text = BeautifulSoup(raw_html, "lxml").get_text(strip=True)
print clean_text
# Dear Parent,This is a test message,kindly ignore it.Thanks

Method # 2: The other option is to use python's library unicodedata

import unicodedata
text_string = BeautifulSoup(raw_html, "lxml").text
clean_text = unicodedata.normalize("NFKD",text_string)
print clean_text
# u'Dear Parent,This is a test message,kindly ignore it.Thanks'

I have also detailed these methods on this blog which you may want to refer.

Running ASP.Net on a Linux based server

It depends what specific .NET technologies you're using. The Mono Project provides an Apache module (mod_mono) for running ASP.NET sites, and from what I gather it works well.

Mono doesn't support all the .NET APIs, though - notably WPF (and possibly WCF too, I can't remember) - but it does provide good support for much else of the framework.

If you're starting from scratch and particularly want to target non-Windows servers, then ensuring your project works with Mono would be a good goal to aim for. However, if you need particular APIs or language features that are not supported by Mono, then you will need to use a Windows server for deployment. It's a design-time/architectural choice that should make up front.

How to dump only specific tables from MySQL?

 
Usage: mysqldump [OPTIONS] database [tables]

i.e.

mysqldump -u username -p db_name table1_name table2_name table3_name > dump.sql

How to debug Spring Boot application with Eclipse?

There's section 19.2 in Spring Boot Reference that tells you about starting your application with remote debugging support enabled. 

$ java -Xdebug -Xrunjdwp:server=y,transport=dt_socket,address=8000,suspend=n \
   -jar target/myproject-0.0.1-SNAPSHOT.jar

After you start your application just add that Remote Java Application configuration in Run/Debug configurations, select the port/address you defined when starting your app, and then you are free to debug.

Gradle project refresh failed after Android Studio update

Make sure that nothing is interfering with your app files (specially in Windows), in my case this problem arise due to a text editor that was holding some XML file and Android Studio wasn't able to modify it.

Establish a VPN connection in cmd

Is Powershell an option?

Start Powershell:

powershell

Create the VPN Connection: Add-VpnConnection

Add-VpnConnection [-Name] <string> [-ServerAddress] <string> [-TunnelType <string> {Pptp | L2tp | Sstp | Ikev2 | Automatic}] [-EncryptionLevel <string> {NoEncryption | Optional | Required | Maximum}] [-AuthenticationMethod <string[]> {Pap | Chap | MSChapv2 | Eap}] [-SplitTunneling] [-AllUserConnection] [-L2tpPsk <string>] [-RememberCredential] [-UseWinlogonCredential] [-EapConfigXmlStream <xml>] [-Force] [-PassThru] [-WhatIf] [-Confirm]

Edit VPN connections: Set-VpnConnection

Set-VpnConnection [-Name] <string> [[-ServerAddress] <string>] [-TunnelType <string> {Pptp | L2tp | Sstp | Ikev2 | Automatic}] [-EncryptionLevel <string> {NoEncryption | Optional | Required | Maximum}] [-AuthenticationMethod <string[]> {Pap | Chap | MSChapv2 | Eap}] [-SplitTunneling <bool>] [-AllUserConnection] [-L2tpPsk <string>] [-RememberCredential <bool>] [-UseWinlogonCredential <bool>] [-EapConfigXmlStream <xml>] [-PassThru] [-Force] [-WhatIf] [-Confirm]

Lookup VPN Connections: Get-VpnConnection

Get-VpnConnection [[-Name] <string[]>] [-AllUserConnection]

Connect: rasdial [connectionName]

rasdial connectionname [username [password | \]] [/domain:domain*] [/phone:phonenumber] [/callback:callbacknumber] [/phonebook:phonebookpath] [/prefixsuffix**]

You can manage your VPN connections with the powershell commands above, and simply use the connection name to connect via rasdial.

The results of Get-VpnConnection can be a little verbose. This can be simplified with a simple Select-Object filter:

Get-VpnConnection | Select-Object -Property Name

More information can be found here:

The calling thread cannot access this object because a different thread owns it

As mentioned here, Dispatcher.Invoke could freeze the UI. Should use Dispatcher.BeginInvoke instead.

Here is a handy extension class to simplify the checking and calling dispatcher invocation.

Sample usage: (call from WPF window)

this Dispatcher.InvokeIfRequired(new Action(() =>
{
    logTextbox.AppendText(message);
    logTextbox.ScrollToEnd();
}));

Extension class:

using System;
using System.Windows.Threading;

namespace WpfUtility
{
    public static class DispatcherExtension
    {
        public static void InvokeIfRequired(this Dispatcher dispatcher, Action action)
        {
            if (dispatcher == null)
            {
                return;
            }
            if (!dispatcher.CheckAccess())
            {
                dispatcher.BeginInvoke(action, DispatcherPriority.ContextIdle);
                return;
            }
            action();
        }
    }
}

Has anyone ever got a remote JMX JConsole to work?

PROTIP:

The RMI port are opened at arbitrary portnr's. If you have a firewall and don't want to open ports 1024-65535 (or use vpn) then you need to do the following.

You need to fix (as in having a known number) the RMI Registry and JMX/RMI Server ports. You do this by putting a jar-file (catalina-jmx-remote.jar it's in the extra's) in the lib-dir and configuring a special listener under server:

<Listener className="org.apache.catalina.mbeans.JmxRemoteLifecycleListener"
      rmiRegistryPortPlatform="10001" rmiServerPortPlatform="10002" />

(And ofcourse the usual flags for activating JMX

    -Dcom.sun.management.jmxremote  \
    -Dcom.sun.management.jmxremote.ssl=false \
    -Dcom.sun.management.jmxremote.authenticate=false \
    -Djava.rmi.server.hostname=<HOSTNAME> \

See: JMX Remote Lifecycle Listener at http://tomcat.apache.org/tomcat-6.0-doc/config/listeners.html

Then you can connect using this horrific URL: 

service:jmx:rmi://<hostname>:10002/jndi/rmi://<hostname>:10001/jmxrmi

C# DateTime to "YYYYMMDDHHMMSS" format

In .Net Standard 2 you can format DateTime like belows:

DateTime dt = DateTime.Now;
CultureInfo iv = CultureInfo.InvariantCulture;

// Default formats
// D - long date           Tuesday, 24 April 2018
// d - short date          04/24/2018
// F - full date long      Tuesday, 24 April 2018 06:30:00
// f - full date short     Tuesday, 24 April 2018 06:30
// G - general long        04/24/2018 06:30:00
// g - general short       04/24/2018 06:30
// U - universal full      Tuesday, 24 April 2018 06:30:00
// u - universal sortable  2018-04-24 06:30:00
// s - sortable            2018-04-24T06:30:00
// T - long time           06:30:00
// t - short time          06:30
// O - ISO 8601            2018-04-24T06:30:00.0000000
// R - RFC 1123            Tue, 24 Apr 2018 06:30:00 GMT           
// M - month               April 24
// Y - year month          2018 April
Console.WriteLine(dt.ToString("D", iv));

// Custom formats
// M/d/yy                  4/8/18
// MM/dd/yyyy              04/08/2018
// yy-MM-dd                08-04-18
// yy-MMM-dd ddd           08-Apr-18 Sun
// yyyy-M-d dddd           2018-4-8 Sunday
// yyyy MMMM dd            2018 April 08      
// h:mm:ss tt zzz          4:03:05 PM -03
// HH:m:s tt zzz           16:03:05 -03:00
// hh:mm:ss t z            04:03:05 P -03
// HH:mm:ss tt zz          16:03:05 PM -03      
Console.WriteLine(dt.ToString("M/d/yy", iv));

Install sbt on ubuntu

No command sbt found

It's saying that sbt is not on your path. Try to run ./sbt from ~/bin/sbt/bin or wherever the sbt executable is to verify that it runs correctly. Also check that you have execute permissions on the sbt executable. If this works , then add ~/bin/sbt/bin to your path and sbt should run from anywhere.

See this question about adding a directory to your path.

To verify the path is set correctly use the which command on LINUX. The output will look something like this:

$ which sbt
/usr/bin/sbt

Lastly, to verify sbt is working try running sbt -help or likewise. The output with -help will look something like this:

$ sbt -help
Usage: sbt [options]

  -h | -help         print this message
  ...

How do I turn off the output from tar commands on Unix?

Just drop the option v.

-v is for verbose. If you don't use it then it won't display:

tar -zxf tmp.tar.gz -C ~/tmp1

How to achieve ripple animation using support library?

I made a simple class that makes ripple buttons, i never needed it in the end so its not the best, But here it is:

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.Button;

public class RippleView extends Button
{
    private float duration = 250;

    private float speed = 1;
    private float radius = 0;
    private Paint paint = new Paint();
    private float endRadius = 0;
    private float rippleX = 0;
    private float rippleY = 0;
    private int width = 0;
    private int height = 0;
    private OnClickListener clickListener = null;
    private Handler handler;
    private int touchAction;
    private RippleView thisRippleView = this;

    public RippleView(Context context)
    {
        this(context, null, 0);
    }

    public RippleView(Context context, AttributeSet attrs)
    {
        this(context, attrs, 0);
    }

    public RippleView(Context context, AttributeSet attrs, int defStyleAttr)
    {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init()
    {
        if (isInEditMode())
            return;

        handler = new Handler();
        paint.setStyle(Paint.Style.FILL);
        paint.setColor(Color.WHITE);
        paint.setAntiAlias(true);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh)
    {
        super.onSizeChanged(w, h, oldw, oldh);
        width = w;
        height = h;
    }

    @Override
    protected void onDraw(@NonNull Canvas canvas)
    {
        super.onDraw(canvas);

        if(radius > 0 && radius < endRadius)
        {
            canvas.drawCircle(rippleX, rippleY, radius, paint);
            if(touchAction == MotionEvent.ACTION_UP)
                invalidate();
        }
    }

    @Override
    public boolean onTouchEvent(@NonNull MotionEvent event)
    {
        rippleX = event.getX();
        rippleY = event.getY();

        switch(event.getAction())
        {
            case MotionEvent.ACTION_UP:
            {
                getParent().requestDisallowInterceptTouchEvent(false);
                touchAction = MotionEvent.ACTION_UP;

                radius = 1;
                endRadius = Math.max(Math.max(Math.max(width - rippleX, rippleX), rippleY), height - rippleY);
                speed = endRadius / duration * 10;
                handler.postDelayed(new Runnable()
                {
                    @Override
                    public void run()
                    {
                        if(radius < endRadius)
                        {
                            radius += speed;
                            paint.setAlpha(90 - (int) (radius / endRadius * 90));
                            handler.postDelayed(this, 1);
                        }
                        else
                        {
                            clickListener.onClick(thisRippleView);
                        }
                    }
                }, 10);
                invalidate();
                break;
            }
            case MotionEvent.ACTION_CANCEL:
            {
                getParent().requestDisallowInterceptTouchEvent(false);
                touchAction = MotionEvent.ACTION_CANCEL;
                radius = 0;
                invalidate();
                break;
            }
            case MotionEvent.ACTION_DOWN:
            {
                getParent().requestDisallowInterceptTouchEvent(true);
                touchAction = MotionEvent.ACTION_UP;
                endRadius = Math.max(Math.max(Math.max(width - rippleX, rippleX), rippleY), height - rippleY);
                paint.setAlpha(90);
                radius = endRadius/4;
                invalidate();
                return true;
            }
            case MotionEvent.ACTION_MOVE:
            {
                if(rippleX < 0 || rippleX > width || rippleY < 0 || rippleY > height)
                {
                    getParent().requestDisallowInterceptTouchEvent(false);
                    touchAction = MotionEvent.ACTION_CANCEL;
                    radius = 0;
                    invalidate();
                    break;
                }
                else
                {
                    touchAction = MotionEvent.ACTION_MOVE;
                    invalidate();
                    return true;
                }
            }
        }

        return false;
    }

    @Override
    public void setOnClickListener(OnClickListener l)
    {
        clickListener = l;
    }
}

EDIT

Since many people are looking for something like this i made a class that can make other views have the ripple effect:

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;

public class RippleViewCreator extends FrameLayout
{
    private float duration = 150;
    private int frameRate = 15;

    private float speed = 1;
    private float radius = 0;
    private Paint paint = new Paint();
    private float endRadius = 0;
    private float rippleX = 0;
    private float rippleY = 0;
    private int width = 0;
    private int height = 0;
    private Handler handler = new Handler();
    private int touchAction;

    public RippleViewCreator(Context context)
    {
        this(context, null, 0);
    }

    public RippleViewCreator(Context context, AttributeSet attrs)
    {
        this(context, attrs, 0);
    }

    public RippleViewCreator(Context context, AttributeSet attrs, int defStyleAttr)
    {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init()
    {
        if (isInEditMode())
            return;

        paint.setStyle(Paint.Style.FILL);
        paint.setColor(getResources().getColor(R.color.control_highlight_color));
        paint.setAntiAlias(true);

        setWillNotDraw(true);
        setDrawingCacheEnabled(true);
        setClickable(true);
    }

    public static void addRippleToView(View v)
    {
        ViewGroup parent = (ViewGroup)v.getParent();
        int index = -1;
        if(parent != null)
        {
            index = parent.indexOfChild(v);
            parent.removeView(v);
        }
        RippleViewCreator rippleViewCreator = new RippleViewCreator(v.getContext());
        rippleViewCreator.setLayoutParams(v.getLayoutParams());
        if(index == -1)
            parent.addView(rippleViewCreator, index);
        else
            parent.addView(rippleViewCreator);
        rippleViewCreator.addView(v);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh)
    {
        super.onSizeChanged(w, h, oldw, oldh);
        width = w;
        height = h;
    }

    @Override
    protected void dispatchDraw(@NonNull Canvas canvas)
    {
        super.dispatchDraw(canvas);

        if(radius > 0 && radius < endRadius)
        {
            canvas.drawCircle(rippleX, rippleY, radius, paint);
            if(touchAction == MotionEvent.ACTION_UP)
                invalidate();
        }
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event)
    {
        return true;
    }

    @Override
    public boolean onTouchEvent(@NonNull MotionEvent event)
    {
        rippleX = event.getX();
        rippleY = event.getY();

        touchAction = event.getAction();
        switch(event.getAction())
        {
            case MotionEvent.ACTION_UP:
            {
                getParent().requestDisallowInterceptTouchEvent(false);

                radius = 1;
                endRadius = Math.max(Math.max(Math.max(width - rippleX, rippleX), rippleY), height - rippleY);
                speed = endRadius / duration * frameRate;
                handler.postDelayed(new Runnable()
                {
                    @Override
                    public void run()
                    {
                        if(radius < endRadius)
                        {
                            radius += speed;
                            paint.setAlpha(90 - (int) (radius / endRadius * 90));
                            handler.postDelayed(this, frameRate);
                        }
                        else if(getChildAt(0) != null)
                        {
                            getChildAt(0).performClick();
                        }
                    }
                }, frameRate);
                break;
            }
            case MotionEvent.ACTION_CANCEL:
            {
                getParent().requestDisallowInterceptTouchEvent(false);
                break;
            }
            case MotionEvent.ACTION_DOWN:
            {
                getParent().requestDisallowInterceptTouchEvent(true);
                endRadius = Math.max(Math.max(Math.max(width - rippleX, rippleX), rippleY), height - rippleY);
                paint.setAlpha(90);
                radius = endRadius/3;
                invalidate();
                return true;
            }
            case MotionEvent.ACTION_MOVE:
            {
                if(rippleX < 0 || rippleX > width || rippleY < 0 || rippleY > height)
                {
                    getParent().requestDisallowInterceptTouchEvent(false);
                    touchAction = MotionEvent.ACTION_CANCEL;
                    break;
                }
                else
                {
                    invalidate();
                    return true;
                }
            }
        }
        invalidate();
        return false;
    }

    @Override
    public final void addView(@NonNull View child, int index, ViewGroup.LayoutParams params)
    {
        //limit one view
        if (getChildCount() > 0)
        {
            throw new IllegalStateException(this.getClass().toString()+" can only have one child.");
        }
        super.addView(child, index, params);
    }
}

When using a Settings.settings file in .NET, where is the config actually stored?

Assuming that you're talking about desktop and not web applications:

When you add settings to a project, VS creates a file named app.config in your project directory and stores the settings in that file. It also builds the Settings.cs file that provides the static accessors to the individual settings.

At compile time, VS will (by default; you can change this) copy the app.config to the build directory, changing its name to match the executable (e.g. if your executable is named foo.exe, the file will be named foo.exe.config), which is the name the .NET configuration manager looks for when it retrieves settings at runtime.

If you change a setting through the VS settings editor, it will update both app.config and Settings.cs. (If you look at the property accessors in the generated code in Settings.cs, you'll see that they're marked with an attribute containing the default value of the setting that's in your app.config file.) If you change a setting by editing the app.config file directly, Settings.cs won't be updated, but the new value will still be used by your program when you run it, because app.config gets copied to foo.exe.config at compile time. If you turn this off (by setting the file's properties), you can change a setting by directly editing the foo.exe.config file in the build directory.

Then there are user-scoped settings.

Application-scope settings are read-only. Your program can modify and save user-scope settings, thus allowing each user to have his/her own settings. These settings aren't stored in the foo.exe.config file (since under Vista, at least, programs can't write to any subdirectory of Program Files without elevation); they're stored in a configuration file in the user's application data directory.

The path to that file is %appdata%\%publisher_name%\%program_name%\%version%\user.config, e.g. C:\Users\My Name\AppData\Local\My_Company\My_Program.exe\1.0.0\user.config. Note that if you've given your program a strong name, the strong name will be appended to the program name in this path.

Format a JavaScript string using placeholders and an object of substitutions?

You can use a custom replace function like this:

var str = "My Name is %NAME% and my age is %AGE%.";
var replaceData = {"%NAME%":"Mike","%AGE%":"26","%EVENT%":"20"};

function substitute(str, data) {
    var output = str.replace(/%[^%]+%/g, function(match) {
        if (match in data) {
            return(data[match]);
        } else {
            return("");
        }
    });
    return(output);
}

var output = substitute(str, replaceData);

You can see it work here: http://jsfiddle.net/jfriend00/DyCwk/.

C# refresh DataGridView when updating or inserted on another form

DataGridView.Refresh and And DataGridView.Update are methods that are inherited from Control. They have to do with redrawing the control which is why new rows don't appear.

My guess is the data retrieval is on the Form_Load. If you want your Button on Form B to retrieve the latest data from the database then that's what you have to do whatever Form_Load is doing.

A nice way to do that is to separate your data retrieval calls into a separate function and call it from both the From Load and Button Click events.

What is the Windows version of cron?

Zcron is available free for personal use.

System.IO.FileNotFoundException: Could not load file or assembly 'X' or one of its dependencies when deploying the application

For me, I started the app from within windows explorer (by double clicking on it). Then it crashed immediately.

I then opened Event Viewer of windows and viewed Application and it displayed full stacktrace of error. The stacktrace showed relation with Bitmap or images. It was then turned out to be due to app icon not found

SHA-1 fingerprint of keystore certificate

If you are using Android Studio IDE then you can get SHA1 has value for your all build variants with one click.

Under Gradle Projects Window > Select Root Project > signingReport > double click

File Navigation

Next

Open Run Window

Go To Variant: release for release

Go To Variant: debug for debug

http://devdeeds.com/create-sha1-key-using-android-studio/

Access denied for user 'test'@'localhost' (using password: YES) except root user

If you are connecting to the MySQL using remote machine(Example workbench) etc., use following steps to eliminate this error on OS where MySQL is installed

mysql -u root -p

CREATE USER '<<username>>'@'%%' IDENTIFIED BY '<<password>>';
GRANT ALL PRIVILEGES ON * . * TO '<<username>>'@'%%';
FLUSH PRIVILEGES;

Try logging into the MYSQL instance.
This worked for me to eliminate this error.

Check existence of directory and create if doesn't exist

In terms of general architecture I would recommend the following structure with regard to directory creation. This will cover most potential issues and any other issues with directory creation will be detected by the dir.create call.

mainDir <- "~"
subDir <- "outputDirectory"

if (file.exists(paste(mainDir, subDir, "/", sep = "/", collapse = "/"))) {
    cat("subDir exists in mainDir and is a directory")
} else if (file.exists(paste(mainDir, subDir, sep = "/", collapse = "/"))) {
    cat("subDir exists in mainDir but is a file")
    # you will probably want to handle this separately
} else {
    cat("subDir does not exist in mainDir - creating")
    dir.create(file.path(mainDir, subDir))
}

if (file.exists(paste(mainDir, subDir, "/", sep = "/", collapse = "/"))) {
    # By this point, the directory either existed or has been successfully created
    setwd(file.path(mainDir, subDir))
} else {
    cat("subDir does not exist")
    # Handle this error as appropriate
}

Also be aware that if ~/foo doesn't exist then a call to dir.create('~/foo/bar') will fail unless you specify recursive = TRUE.

How to dynamic filter options of <select > with jQuery?

This is a simple solution where you clone the lists options and keep them in an object for recovery later. The scripts cleans out the list and add only the options that contains the input text. This should also work cross browser. I got some help from this post: https://stackoverflow.com/a/5748709/542141

Html

<input id="search_input" placeholder="Type to filter">
<select id="theList" class="List" multiple="multiple">

or razor

@Html.ListBoxFor(g => g.SelectedItem, Model.items, new { @class = "List", @id = "theList" })

script

<script type="text/javascript">
  $(document).ready(function () {
    //copy options
    var options = $('#theList option').clone();
    //react on keyup in textbox
    $('#search_input').keyup(function () {
      var val = $(this).val();
      $('#theList').empty();
      //take only the options containing your filter text or all if empty
      options.filter(function (idx, el) {
        return val === '' || $(el).text().indexOf(val) >= 0;
      }).appendTo('#theList');//add it to list
     });
  });
</script>

Coloring Buttons in Android with Material Design and AppCompat

if you use kotlin, can you see All attributes from MaterialButton are supported. Do not use the android:background attribute. MaterialButton manages its own background drawable, and setting a new background means Material button disabled color can no longer guarantee that the new attributes it introduces will function properly. If the default background is changed, Material Button cannot guarantee well-defined behavior. At MainActivity.kt

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        buttonClick.setOnClickListener {
            (it as MaterialButton).apply {
                backgroundTintList = ColorStateList.valueOf(Color.YELLOW)
                backgroundTintMode = PorterDuff.Mode.SRC_ATOP
            }
        }
    }
}

At activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/constraintLayout"
    tools:context=".MainActivity">
    <com.google.android.material.button.MaterialButton
        android:id="@+id/buttonNormal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="Material Button Normal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <com.google.android.material.button.MaterialButton
        android:id="@+id/buttonTint"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:backgroundTint="#D3212D"
        android:text="Material Button Background Red"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/buttonNormal" />
    <com.google.android.material.button.MaterialButton
        android:id="@+id/buttonTintMode"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:backgroundTint="#D3212D"
        android:backgroundTintMode="multiply"
        android:text="Tint Red + Mode Multiply"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/buttonTint" />
    <com.google.android.material.button.MaterialButton
        android:id="@+id/buttonClick"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="Click To Change Background"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/buttonTintMode" />
</androidx.constraintlayout.widget.ConstraintLayout>

resource : Material button change color example

SQL: ... WHERE X IN (SELECT Y FROM ...)

Maybe try this

Select cust.*

From dbo.Customers cust
Left Join dbo.Subscribers subs on cust.Customer_ID = subs.Customer_ID
Where subs.Customer_Id Is Null

How to write Unicode characters to the console?

Console.OutputEncoding Property

https://docs.microsoft.com/en-us/dotnet/api/system.console.outputencoding

Note that successfully displaying Unicode characters to the console requires the following:

  • The console must use a TrueType font, such as Lucida Console or Consolas, to display characters.

Project Links do not work on Wamp Server

I find it's a lot easier (than accepted answer) to create a local subdomain by project and tell Apache to serve multiple sites by name.

For example, let's say you created a project under c:/wamp64/www/sites/mysite, to be able to access it at http://mysite.localhost you simply need to do the following:

1. Tell your machine to answer to different names Add 127.0.0.1 mysite.localhost to C:\windows\system32\drivers\etc\hosts

2. Flush your DNS cache Open a Command Prompt as administrator and type net stop dnscache, then net start dnscache.

3. Tell Apache where to look Click on Wamp's icon in tray, go to Apache -> httpd.conf, and add this at the end:

# Tells Apache to identify which site by name
NameVirtualHost *:80
# Tells Apache to serve the default WAMP Server page to "localhost"
<VirtualHost 127.0.0.1>
ServerName localhost
DocumentRoot "C:/wamp/www"
</VirtualHost> 
# Tells Apache to serve Client 1's pages to "client1.localhost"
# Duplicate and modify this block to add another client
<VirtualHost 127.0.0.1>
# The name to respond to
ServerName client1.localhost
# Folder where the files live
DocumentRoot "C:/wamp64/www/sites/mysite"
# A few helpful settings...
<Directory "C:/wamp64/www/sites/mysite">
allow from all
order allow,deny
# Enables .htaccess files for this site
AllowOverride All
</Directory>
# Apache will look for these two files, in this order, if no file is specified in the URL
DirectoryIndex index.html index.php
</VirtualHost>

(source)

4. Restart Apache Click on Wamp's icon in tray, select "restart"

5. Define a base url Go to your project folder, add <base href="http://mysite.localhost" /> to your <head> section to prevent /links to server root from being broken.

Personally, I inject this html code dynamically into my template using PHP (something like $site_root = (IS_LOCALHOST) ? '<base href="http://mysite.localhost" />' : null;) so I don't have to bother removing that once on production.

Removing duplicate elements from an array in Swift

Xcode 10.1 - Swift 4.2 Simple and Powerful Solution

func removeDuplicates(_ nums: inout [Int]) -> Int {
    nums = Set(nums).sorted()
    return nums.count
}

Example

var arr = [1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9]
removeDuplicates(&arr)

print(arr) // [1,2,3,4,5,6,7,8,9]

How to restore PostgreSQL dump file into Postgres databases?

The problem with your attempt at the psql command line is the direction of the slashes:

newTestDB-# /i E:\db-rbl-restore-20120511_Dump-20120514.sql   # incorrect
newTestDB-# \i E:/db-rbl-restore-20120511_Dump-20120514.sql   # correct

To be clear, psql commands start with a backslash, so you should have put \i instead. What happened as a result of your typo is that psql ignored everything until finding the first \, which happened to be followed by db, and \db happens to be the psql command for listing table spaces, hence why the output was a List of tablespaces. It was not a listing of "default tables of PostgreSQL" as you said.

Further, it seems that psql expects the filepath argument to delimit directories using the forward slash regardless of OS (thus on Windows this would be counter-intuitive).

It is worth noting that your attempt at "elevating permissions" had no relation to the outcome of the command you attempted to execute. Also, you did not say what caused the supposed "Permission Denied" error.

Finally, the extension on the dump file does not matter, in fact you don't even need an extension. Indeed, pgAdmin suggests a .backup extension when selecting a backup filename, but you can actually make it whatever you want, again, including having no extension at all. The problem is that pgAdmin seems to only allow a "Restore" of "Custom or tar" or "Directory" dumps (at least this is the case in the MAC OS X version of the app), so just use the psql \i command as shown above.

How to select an element with 2 classes

You can chain class selectors without a space between them:

.a.b {
     color: #666;
}

Note that, if it matters to you, IE6 treats .a.b as .b, so in that browser both div.a.b and div.b will have gray text. See this answer for a comparison between proper browsers and IE6.

String to object in JS

This is universal code , no matter how your input is long but in same schema if there is : separator :)

var string = "firstName:name1, lastName:last1"; 
var pass = string.replace(',',':');
var arr = pass.split(':');
var empty = {};
arr.forEach(function(el,i){
  var b = i + 1, c = b/2, e = c.toString();
     if(e.indexOf('.') != -1 ) {
     empty[el] = arr[i+1];
  } 
}); 
  console.log(empty)

Warning: mysqli_query() expects parameter 1 to be mysqli, resource given

You are mixing mysqli and mysql extensions, which will not work.

You need to use 

$myConnection= mysqli_connect("$db_host","$db_username","$db_pass") or die ("could not connect to mysql"); 

mysqli_select_db($myConnection, "mrmagicadam") or die ("no database");

mysqli has many improvements over the original mysql extension, so it is recommended that you use mysqli.

How to pull specific directory with git

Sometimes, you just want to have a look at previous copies of files without the rigmarole of going through the diffs.

In such a case, it's just as easy to make a clone of a repository and checkout the specific commit that you are interested in and have a look at the subdirectory in that cloned repository. Because everything is local you can just delete this clone when you are done.

How to insert data into elasticsearch

I started off using curl, but since have migrated to use kibana. Here is some more information on the ELK stack from elastic.co (E elastic search, K kibana): https://www.elastic.co/elk-stack

With kibana your POST requests are a bit more simple:

POST /<INDEX_NAME>/<TYPE_NAME>
{
    "field": "value",
    "id": 1,
    "account_id": 213,
    "name": "kimchy"
}

Why am I getting Unknown error in line 1 of pom.xml?

As per the suggestion from @Shravani, in my pom.xml file, I changed my version number in the area from this:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.5.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

to this:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.4.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

I then right clicked on the project and did a 'Maven -> Update project...'. This made the problem go away for me.