PHP server on local machine?
I use WAMP. One easy install wizard, tons of modules to for Apache and PHP preconfigured and easy to turn on and off to match your remote config.
Upgrading PHP in XAMPP for Windows?
I just upgrade my old XAMPP portable with PHP 5.3.X(Include Mercury & FileZilla & Tomcat) to XAMPP portable with PHP 5.6.X ( Include previous versions ) ...
My way:
- First download last xampp portable(my using version: xampp-portable-win32-5.6.14-3-VC11Direct Download Link) Last XAMPP
- Extract new download file to drive d , because new version dont have mercury,filezilla,tomcat in it , then i copy these packages from my old version to new one
- Now on old xampp first copy all htdocs files to new xampp htdocs
- Now on old xampp backup all of database in 5 two 10 separated sql files
- Now on new xampp going and change some settings like
max_upload_size
and etc on php.ini and also in /apache/conf/extra/httpd-xampp.conf
- Now delete ( make a rar archive and delete ) it , and copy new xampp from drive
D
to drive C
- Now start new xampp , going to phpmyadmin , create a user and password that i use in previous xampp and add all privileges that user.
- Now going to import tab on phpmyadmin and separately import sql files.
- Now i test xampp with all new features in drive C
NOTE
On Export database tab on phpmyadmin, select UTF-8 Character and check Disable foreign key checks
checkbox
and on import tab uncheck Enable foreign key checks
.
How to set up Automapper in ASP.NET Core
I figured it out! Here's the details:
Add the main AutoMapper Package to your solution via NuGet.
Add the AutoMapper Dependency Injection Package to your solution via NuGet.
Create a new class for a mapping profile. (I made a class in the main solution directory called MappingProfile.cs
and add the following code.) I'll use a User
and UserDto
object as an example.
public class MappingProfile : Profile {
public MappingProfile() {
// Add as many of these lines as you need to map your objects
CreateMap<User, UserDto>();
CreateMap<UserDto, User>();
}
}
Then add the AutoMapperConfiguration in the Startup.cs
as shown below:
public void ConfigureServices(IServiceCollection services) {
// .... Ignore code before this
// Auto Mapper Configurations
var mapperConfig = new MapperConfiguration(mc =>
{
mc.AddProfile(new MappingProfile());
});
IMapper mapper = mapperConfig.CreateMapper();
services.AddSingleton(mapper);
services.AddMvc();
}
To invoke the mapped object in code, do something like the following:
public class UserController : Controller {
// Create a field to store the mapper object
private readonly IMapper _mapper;
// Assign the object in the constructor for dependency injection
public UserController(IMapper mapper) {
_mapper = mapper;
}
public async Task<IActionResult> Edit(string id) {
// Instantiate source object
// (Get it from the database or whatever your code calls for)
var user = await _context.Users
.SingleOrDefaultAsync(u => u.Id == id);
// Instantiate the mapped data transfer object
// using the mapper you stored in the private field.
// The type of the source object is the first type argument
// and the type of the destination is the second.
// Pass the source object you just instantiated above
// as the argument to the _mapper.Map<>() method.
var model = _mapper.Map<UserDto>(user);
// .... Do whatever you want after that!
}
}
I hope this helps someone starting fresh with ASP.NET Core! I welcome any feedback or criticisms as I'm still new to the .NET world!
SELECT only rows that contain only alphanumeric characters in MySQL
Your statement matches any string that contains a letter or digit anywhere, even if it contains other non-alphanumeric characters. Try this:
SELECT * FROM table WHERE column REGEXP '^[A-Za-z0-9]+$';
^
and $
require the entire string to match rather than just any portion of it, and +
looks for 1 or more alphanumberic characters.
You could also use a named character class if you prefer:
SELECT * FROM table WHERE column REGEXP '^[[:alnum:]]+$';
Is there way to use two PHP versions in XAMPP?
Why switch between PHP versions when you can use multiple PHP
version at a same time with a single xampp installation?
With a single xampp installation, you have 2 options:
Run an older PHP version for only the directory of your old project:
This will serve the purpose most of the time, you may have one or two
old projects that you intend to run with older PHP version.
Just configure xampp to run older PHP version only for
those project directories.
Run an older PHP version on a separate port of xampp: Sometimes you may
be upgrading and old project to latest PHP version when you need to run the
same project on new and older PHP version back and forth.
Then you can set an older PHP version on a different port (say 8056)
so when you go to http://localhost/any_project/
xampp runs PHP 7
and when you go to http://localhost:8056/any_project/
xampp runs PHP
5.6.
Run an older PHP version on a virtualhost: You can create a virtualhost
like localhost56 to run PHP 5.6 while you can use PHP 7 on localhost.
Lets set it up.
Step 1: Download PHP
So you have PHP 7 running under xampp, you want to add an older PHP version to it, say PHP 5.6. Download the nts (Non Thread Safe) version of PHP zip archive from php.net (see archive for older versions) and extract the files under c:\xampp\php56
. The thread safe version does not include php-cgi.exe.
Step 2: Configure php.ini
Open c:\xampp\php56\php.ini
file in notepad. If the file does not exist copy php.ini-development
to php.ini
and open it in notepad. Then uncomment the following line:
extension_dir = "ext"
Step 3: Configure apache
Open xampp control panel, click config button for apache, and click Apache (httpd-xampp.conf)
. A text file will open up put the following settings at the bottom of the file:
ScriptAlias /php56 "C:/xampp/php56"
Action application/x-httpd-php56-cgi /php56/php-cgi.exe
<Directory "C:/xampp/php56">
AllowOverride None
Options None
Require all denied
<Files "php-cgi.exe">
Require all granted
</Files>
</Directory>
Note: You can add more versions of PHP to your xampp installation following step 1 to 3 if you want.
Step 4 (option 1): [Add Directories to run specific PHP version]
Now you can set directories that will run in PHP 5.6. Just add the following at the bottom of the config file (httpd-xampp.conf
from Step 3) to set directories.
<Directory "C:\xampp\htdocs\my_old_project1">
<FilesMatch "\.php$">
SetHandler application/x-httpd-php56-cgi
</FilesMatch>
</Directory>
<Directory "C:\xampp\htdocs\my_old_project2">
<FilesMatch "\.php$">
SetHandler application/x-httpd-php56-cgi
</FilesMatch>
</Directory>
Step 4 (option 2): [Run older PHP version on a separate port]
Now to to set PHP v5.6 to port 8056 add the following code to the bottom of the config file (httpd-xampp.conf
from Step 3).
Listen 8056
<VirtualHost *:8056>
<FilesMatch "\.php$">
SetHandler application/x-httpd-php56-cgi
</FilesMatch>
</VirtualHost>
Step 4 (option 3): [Run an older PHP version on a virtualhost]
To create a virtualhost (localhost56) on a directory (htdocs56) to use PHP v5.6 on http://localhost56, create directory htdocs56 at your desired location and
add localhost56 to your hosts file (see how),
then add the following code to the bottom of the config file (httpd-xampp.conf
from Step 3).
<VirtualHost localhost56:80>
DocumentRoot "C:\xampp\htdocs56"
ServerName localhost56
<Directory "C:\xampp\htdocs56">
Require all granted
</Directory>
<FilesMatch "\.php$">
SetHandler application/x-httpd-php56-cgi
</FilesMatch>
</VirtualHost>
Finish: Save and Restart Apache
Save and close the config file, Restart apache from xampp control panel. If you went for option 2 you can see the additional port(8056) listed in your xampp control panel.
Update for Error:
malformed header from script 'php-cgi.exe': Bad header
If you encounter the above error, open httpd-xampp.conf
again and comment out the following line with a leading # (hash character).
SetEnv PHPRC "\\path\\to\\xampp\\php"
Extracting double-digit months and days from a Python date
you can use a string formatter to pad any integer with zeros. It acts just like C's printf
.
>>> d = datetime.date.today()
>>> '%02d' % d.month
'03'
Updated for py36: Use f-strings! For general int
s you can use the d
formatter and explicitly tell it to pad with zeros:
>>> d = datetime.date.today()
>>> f"{d.month:02d}"
'07'
But datetime
s are special and come with special formatters that are already zero padded:
>>> f"{d:%d}" # the day
'01'
>>> f"{d:%m}" # the month
'07'
How to build jars from IntelliJ properly?
I recently had this problem and think these steps are easy to follow if any prior solution or link is missing detail.
How to create a .jar
using IntelliJ IDEA 14.1.5:
- File > Save All.
- Run driver or class with main method.
- File > Project Structure.
- Select Tab "Artifacts".
- Click green plus button near top of window.
- Select JAR from Add drop down menu. Select "From modules with dependencies"
- Select main class.
- The radio button should be selecting "extract to the target JAR." Press OK.
- Check the box "Build on make"
- Press apply and OK.
- From the main menu, select the build dropdown.
- Select the option build artifacts.
How do I put text on ProgressBar?
You will have to override the OnPaint method, call the base implementation and the paint your own text.
You will need to create your own CustomProgressBar
and then override OnPaint
to draw what ever text you want.
Custom Progress Bar Class
namespace ProgressBarSample
{
public enum ProgressBarDisplayText
{
Percentage,
CustomText
}
class CustomProgressBar: ProgressBar
{
//Property to set to decide whether to print a % or Text
public ProgressBarDisplayText DisplayStyle { get; set; }
//Property to hold the custom text
public String CustomText { get; set; }
public CustomProgressBar()
{
// Modify the ControlStyles flags
//http://msdn.microsoft.com/en-us/library/system.windows.forms.controlstyles.aspx
SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
}
protected override void OnPaint(PaintEventArgs e)
{
Rectangle rect = ClientRectangle;
Graphics g = e.Graphics;
ProgressBarRenderer.DrawHorizontalBar(g, rect);
rect.Inflate(-3, -3);
if (Value > 0)
{
// As we doing this ourselves we need to draw the chunks on the progress bar
Rectangle clip = new Rectangle(rect.X, rect.Y, (int)Math.Round(((float)Value / Maximum) * rect.Width), rect.Height);
ProgressBarRenderer.DrawHorizontalChunks(g, clip);
}
// Set the Display text (Either a % amount or our custom text
string text = DisplayStyle == ProgressBarDisplayText.Percentage ? Value.ToString() + '%' : CustomText;
using (Font f = new Font(FontFamily.GenericSerif, 10))
{
SizeF len = g.MeasureString(text, f);
// Calculate the location of the text (the middle of progress bar)
// Point location = new Point(Convert.ToInt32((rect.Width / 2) - (len.Width / 2)), Convert.ToInt32((rect.Height / 2) - (len.Height / 2)));
Point location = new Point(Convert.ToInt32((Width / 2) - len.Width / 2), Convert.ToInt32((Height / 2) - len.Height / 2));
// The commented-out code will centre the text into the highlighted area only. This will centre the text regardless of the highlighted area.
// Draw the custom text
g.DrawString(text, f, Brushes.Red, location);
}
}
}
}
Sample WinForms Application
using System;
using System.Linq;
using System.Windows.Forms;
using System.Collections.Generic;
namespace ProgressBarSample
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
// Set our custom Style (% or text)
customProgressBar1.DisplayStyle = ProgressBarDisplayText.CustomText;
customProgressBar1.CustomText = "Initialising";
}
private void btnReset_Click(object sender, EventArgs e)
{
customProgressBar1.Value = 0;
btnStart.Enabled = true;
}
private void btnStart_Click(object sender, EventArgs e)
{
btnReset.Enabled = false;
btnStart.Enabled = false;
for (int i = 0; i < 101; i++)
{
customProgressBar1.Value = i;
// Demo purposes only
System.Threading.Thread.Sleep(100);
// Set the custom text at different intervals for demo purposes
if (i > 30 && i < 50)
{
customProgressBar1.CustomText = "Registering Account";
}
if (i > 80)
{
customProgressBar1.CustomText = "Processing almost complete!";
}
if (i >= 99)
{
customProgressBar1.CustomText = "Complete";
}
}
btnReset.Enabled = true;
}
}
}
C# DateTime.ParseExact
That's because you have the Date in American format in line[i]
and UK format in the FormatString
.
11/20/2011
M / d/yyyy
I'm guessing you might need to change the FormatString to:
"M/d/yyyy h:mm"
Inserting data into a MySQL table using VB.NET
your str_carSql should be exactly like this:
str_carSql = "insert into members_car (car_id, member_id, model, color, chassis_id, plate_number, code) values (@id,@m_id,@model,@color,@ch_id,@pt_num,@code)"
Good Luck
System.Net.WebException HTTP status code
(I do realise the question is old, but it's among the top hits on Google.)
A common situation where you want to know the response code is in exception handling. As of C# 7, you can use pattern matching to actually only enter the catch clause if the exception matches your predicate:
catch (WebException ex) when (ex.Response is HttpWebResponse response)
{
doSomething(response.StatusCode)
}
This can easily be extended to further levels, such as in this case where the WebException
was actually the inner exception of another (and we're only interested in 404
):
catch (StorageException ex) when (ex.InnerException is WebException wex && wex.Response is HttpWebResponse r && r.StatusCode == HttpStatusCode.NotFound)
Finally: note how there's no need to re-throw the exception in the catch clause when it doesn't match your criteria, since we don't enter the clause in the first place with the above solution.
Job for mysqld.service failed See "systemctl status mysqld.service"
open my.cnf and copy the log-error
path
then check the permission for the copied log file using
$ ls -l /var/log/mysql.log
if any log file permission may changed from mysql:mysql, please change the file permission to
$ chown -R mysql:mysql /var/log/mysql.log
then restart the mysql server
$ service mysql restart || systemctl restart mysqld
note: this kind of errors formed by the permission issues. all the mysql service start commands using the log file for writing the status of mysql. If the permission has been changed, the service can't be write anything into the log files. If it happens it will stopped to run the service
Show "loading" animation on button click
//do processing
$(this).attr("label", $(this).text()).text("loading ....").animate({ disabled: true }, 1000, function () {
//original event call
$.when($(elm).delay(1000).one("click")).done(function () {//processing finalized
$(this).text($(this).attr("label")).animate({ disabled: false }, 1000, function () {
})
});
});
Recursively counting files in a Linux directory
Since filenames in UNIX may contain newlines (yes, newlines), wc -l
might count too many files. I would print a dot for every file and then count the dots:
find DIR_NAME -type f -printf "." | wc -c
How to draw a custom UIView that is just a circle - iPhone app
Swift 3 class:
import UIKit
class CircleView: UIView {
override func draw(_ rect: CGRect) {
guard let context = UIGraphicsGetCurrentContext() else {return}
context.addEllipse(in: rect)
context.setFillColor(UIColor.blue.cgColor)
context.fillPath()
}
}
Find the last element of an array while using a foreach loop in PHP
SINCE PHP 7.3 UNTIL NOW You could get the value of the last key of the array using array_key_last($array)
and compare it to the current key:
$last_key = array_key_last($array);
foreach ($array as $key => $value) {
if ($key == $last_key) {
// last element
} else {
// not last element
}
}
Using the Web.Config to set up my SQL database connection string?
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class form_city : System.Web.UI.Page
{
connection con = new connection();
DataTable dtable;
string status = "";
protected void Page_Load(object sender, EventArgs e)
{
TextBoxWatermarkExtender1.WatermarkText = "Enter State Name !";
if (!IsPostBack)
{
status = "Active";
fillgrid();
Session.Add("ope", "Listing");
}
}
protected void fillgrid()
{
//Session.Add("ope", "Listing");
string query = "select *";
query += "from State_Detail where Status='" + status + "'";
dtable = con.sqlSelect(query);
grdList.DataSource = dtable;
grdList.DataBind();
lbtnBack.Visible = false;
}
protected void grdList_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
grdList.PageIndex = e.NewPageIndex;
string operation = Session["ope"].ToString();
if (operation == "ViewLog")
status = "Inactive";
else if (operation == "Listing")
status = "Active";
fillgrid();
}
public string GetImage(string status)
{
if (status == "Active")
return "~/images/green_acti.png";
else
return "~/images/red_acti.png";
}
protected void grdList_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
string st = "Inactive";
int State_Id = Convert.ToInt32(grdList.DataKeys[e.RowIndex].Values[0]);
string query = "update State_Detail set Status='" + st + "'";
query += " where State_Id=" + State_Id;
con.sqlInsUpdDel(query);
status = "Active";
fillgrid();
}
protected void grdList_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.Equals("Select"))
{
string query = "select * ";
query += "from State_Detail where State_Id=" + e.CommandArgument;
dtable = con.sqlSelect(query);
grdList.DataSource = dtable;
grdList.DataBind();
lbtnBack.Visible = true;
}
}
protected void ibtnSearch_Click(object sender, ImageClickEventArgs e)
{
Session.Add("ope", "Listing");
if (txtDepId.Text != "")
{
string query = "select * from State_Detail where State_Name like '" + txtDepId.Text + "%'";
dtable = con.sqlSelect(query);
grdList.DataSource = dtable;
grdList.DataBind();
txtDepId.Text = "";
}
}
protected void grdList_RowEditing(object sender, GridViewEditEventArgs e)
{
int State_Id = Convert.ToInt32(grdList.DataKeys[e.NewEditIndex].Values[0]);
Session.Add("ope", "Edit");
Session.Add("State_Id", State_Id);
Response.Redirect("form_state.aspx");
}
protected void grdList_Sorting(object sender, GridViewSortEventArgs e)
{
string operation = Session["ope"].ToString();
if (operation == "ViewLog")
status = "Inactive";
else if (operation == "Listing")
status = "Active";
string query = "select * from State_Detail";
query += " where Status='" + status + "'";
dtable = con.sqlSelect(query);
DataView dview = new DataView(dtable);
dview.Sort = e.SortExpression + " asc";
grdList.DataSource = dview;
grdList.DataBind();
}
}
<asp:Image ID="imgGreenAct" ImageUrl='<%# GetImage(Convert.ToString(DataBinder.Eval(Container.DataItem, "Status")))%>' AlternateText='<%# Bind("Status") %>' runat="server" />
Chrome hangs after certain amount of data transfered - waiting for available socket
Chrome is a Chromium-based browser and Chromium-based browsers only allow maximum 6 open socket connections at a time, when the 7th connection starts up it will just sit idle and wait for one of the 6 which are running to stop and then it will start running.
Hence the error code ‘waiting for available sockets’, the 7th one will wait for one of those 6 sockets to become available and then it will start running.
You can either
How can I clear or empty a StringBuilder?
There are basically two alternatives, using setLength(0)
to reset the StringBuilder or creating a new one in each iteration. Both can have pros and cons depending on the usage.
If you know the expected capacity of the StringBuilder beforehand, creating a new one each time should be just as fast as setting a new length. It will also help the garbage collector, since each StringBuilder will be relatively short-lived and the gc is optimized for that.
When you don't know the capacity, reusing the same StringBuilder might be faster. Each time you exceed the capacity when appending, a new backing array has to be allocated and the previous content has to be copied. By reusing the same StringBuilder, it will reach the needed capacity after some iterations and there won't be any copying thereafter.
OS X Terminal Colors
If you are using tcsh, then edit your ~/.cshrc
file to include the lines:
setenv CLICOLOR 1
setenv LSCOLORS dxfxcxdxbxegedabagacad
Where, like Martin says, LSCOLORS specifies the color scheme you want to use.
To generate the LSCOLORS you want to use, checkout this site
Rotation of 3D vector?
Using the Euler-Rodrigues formula:
import numpy as np
import math
def rotation_matrix(axis, theta):
"""
Return the rotation matrix associated with counterclockwise rotation about
the given axis by theta radians.
"""
axis = np.asarray(axis)
axis = axis / math.sqrt(np.dot(axis, axis))
a = math.cos(theta / 2.0)
b, c, d = -axis * math.sin(theta / 2.0)
aa, bb, cc, dd = a * a, b * b, c * c, d * d
bc, ad, ac, ab, bd, cd = b * c, a * d, a * c, a * b, b * d, c * d
return np.array([[aa + bb - cc - dd, 2 * (bc + ad), 2 * (bd - ac)],
[2 * (bc - ad), aa + cc - bb - dd, 2 * (cd + ab)],
[2 * (bd + ac), 2 * (cd - ab), aa + dd - bb - cc]])
v = [3, 5, 0]
axis = [4, 4, 1]
theta = 1.2
print(np.dot(rotation_matrix(axis, theta), v))
# [ 2.74911638 4.77180932 1.91629719]
ORA-12154: TNS:could not resolve the connect identifier specified (PLSQL Developer)
I had the same issue with a VM running CentOS7 and Oracle 11GR2 accesible from Windows 7, the solution were weird, at my local machine the tnsnames pointing to the DB had a space before the service name, I just deleted the space and then I was able to connect.
A quick example.
Wrong tnsnames.
[this is a empty space]XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
)
)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)
Right tnsnames.
XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
)
)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)
How to catch integer(0)?
If it's specifically zero length integers, then you want something like
is.integer0 <- function(x)
{
is.integer(x) && length(x) == 0L
}
Check it with:
is.integer0(integer(0)) #TRUE
is.integer0(0L) #FALSE
is.integer0(numeric(0)) #FALSE
You can also use assertive
for this.
library(assertive)
x <- integer(0)
assert_is_integer(x)
assert_is_empty(x)
x <- 0L
assert_is_integer(x)
assert_is_empty(x)
## Error: is_empty : x has length 1, not 0.
x <- numeric(0)
assert_is_integer(x)
assert_is_empty(x)
## Error: is_integer : x is not of class 'integer'; it has class 'numeric'.
Add up a column of numbers at the Unix shell
sizes=( $(cat files.txt | xargs ls -l | cut -c 23-30) )
total=$(( $(IFS="+"; echo "${sizes[*]}") ))
Or you could just sum them as you read the sizes
declare -i total=0
while read x; total+=x; done < <( cat files.txt | xargs ls -l | cut -c 23-30 )
If you don't care about bite sizes and blocks is OK, then just
declare -i total=0
while read s junk; total+=s; done < <( cat files.txt | xargs ls -s )
What does the "$" sign mean in jQuery or JavaScript?
In jQuery, the $ sign is just an alias to jQuery()
, then an alias to a function.
This page reports:
Basic syntax is: $(selector).action()
- A dollar sign to define jQuery
- A (selector) to "query (or find)" HTML elements
- A jQuery action() to be performed on the element(s)
Find nearest value in numpy array
Here is a fast vectorized version of @Dimitri's solution if you have many values
to search for (values
can be multi-dimensional array):
#`values` should be sorted
def get_closest(array, values):
#make sure array is a numpy array
array = np.array(array)
# get insert positions
idxs = np.searchsorted(array, values, side="left")
# find indexes where previous index is closer
prev_idx_is_less = ((idxs == len(array))|(np.fabs(values - array[np.maximum(idxs-1, 0)]) < np.fabs(values - array[np.minimum(idxs, len(array)-1)])))
idxs[prev_idx_is_less] -= 1
return array[idxs]
Benchmarks
> 100 times faster than using a for
loop with @Demitri's solution`
>>> %timeit ar=get_closest(np.linspace(1, 1000, 100), np.random.randint(0, 1050, (1000, 1000)))
139 ms ± 4.04 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
>>> %timeit ar=[find_nearest(np.linspace(1, 1000, 100), value) for value in np.random.randint(0, 1050, 1000*1000)]
took 21.4 seconds
Sorting an IList in C#
Found a good post on this and thought I'd share. Check it out HERE
Basically.
You can create the following class and IComparer Classes
public class Widget {
public string Name = string.Empty;
public int Size = 0;
public Widget(string name, int size) {
this.Name = name;
this.Size = size;
}
}
public class WidgetNameSorter : IComparer<Widget> {
public int Compare(Widget x, Widget y) {
return x.Name.CompareTo(y.Name);
}
}
public class WidgetSizeSorter : IComparer<Widget> {
public int Compare(Widget x, Widget y) {
return x.Size.CompareTo(y.Size);
}
}
Then If you have an IList, you can sort it like this.
List<Widget> widgets = new List<Widget>();
widgets.Add(new Widget("Zeta", 6));
widgets.Add(new Widget("Beta", 3));
widgets.Add(new Widget("Alpha", 9));
widgets.Sort(new WidgetNameSorter());
widgets.Sort(new WidgetSizeSorter());
But Checkout this site for more information... Check it out HERE
Pass props to parent component in React.js
Basically you use props to send information to and from Child and Parent.
Adding to all the wonderful answers, let me give a simple example that explains passing values from child to parent component in React
App.js
class App extends React.Component {
constructor(){
super();
this.handleFilterUpdate = this.handleFilterUpdate.bind(this);
this.state={name:'igi'}
}
handleFilterUpdate(filterValue) {
this.setState({
name: filterValue
});
}
render() {
return (
<div>
<Header change={this.handleFilterUpdate} name={this.state.name} />
<p>{this.state.name}</p>
</div>
);
}
}
Header.js
class Header extends React.Component {
constructor(){
super();
this.state={
names: 'jessy'
}
}
Change(event) {
// this.props.change(this.state.names);
this.props.change('jessy');
}
render() {
return (
<button onClick={this.Change.bind(this)}>click</button>
);
}
}
Main.js
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.jsx';
ReactDOM.render(<App />, document.getElementById('app'));
Thats it , now you can pass values from your client to the server.
Take a look at the Change function in the Header.js
Change(event) {
// this.props.change(this.state.names);
this.props.change('jessy');
}
This is how you push values into the props from client to the server
How do I print the full value of a long string in gdb?
There is a third option: the x command, which allows you to set a different limit for the specific command instead of changing a global setting. To print the first 300 characters of a string you can use x/300s your_string
. The output might be a bit harder to read. For example printing a SQL query results in:
(gdb) x/300sb stmt.c_str()
0x9cd948: "SELECT article.r"...
0x9cd958: "owid FROM articl"...
..
Usage of unicode() and encode() functions in Python
Make sure you've set your locale settings right before running the script from the shell, e.g.
$ locale -a | grep "^en_.\+UTF-8"
en_GB.UTF-8
en_US.UTF-8
$ export LC_ALL=en_GB.UTF-8
$ export LANG=en_GB.UTF-8
Docs: man locale
, man setlocale
.
MySQL INNER JOIN select only one row from second table
There are two problems with your query:
- Every table and subquery needs a name, so you have to name the subquery
INNER JOIN (SELECT ...) AS p ON ...
.
- The subquery as you have it only returns one row period, but you actually want one row for each user. For that you need one query to get the max date and then self-join back to get the whole row.
Assuming there are no ties for payments.date
, try:
SELECT u.*, p.*
FROM (
SELECT MAX(p.date) AS date, p.user_id
FROM payments AS p
GROUP BY p.user_id
) AS latestP
INNER JOIN users AS u ON latestP.user_id = u.id
INNER JOIN payments AS p ON p.user_id = u.id AND p.date = latestP.date
WHERE u.package = 1
Spring Security with roles and permissions
ACL was overkill for my requirements also.
I ended up creating a library similar to @Alexander's to inject a GrantedAuthority
list for Role->Permissions based on the role membership of a user.
For example, using a DB to hold the relationships -
@Autowired
RolePermissionsRepository repository;
public void setup(){
String roleName = "ROLE_ADMIN";
List<String> permissions = new ArrayList<String>();
permissions.add("CREATE");
permissions.add("READ");
permissions.add("UPDATE");
permissions.add("DELETE");
repository.save(new RolePermissions(roleName, permissions));
}
When an Authentication object is injected in the current security session, it will have the original roles/granted authorities.
This library provides 2 built-in integration points for Spring Security.
When the integration point is reached, the PermissionProvider is called to get the effective permissions for each role the user is a member of.
The distinct list of permissions are added as GrantedAuthority items in the Authentication object.
You can also implement a custom PermissionProvider
to store the relationships in config for example.
A more complete explanation here - https://stackoverflow.com/a/60251931/1308685
And the source code is here -
https://github.com/savantly-net/spring-role-permissions
Cannot create Maven Project in eclipse
Same problem here, solved.
I will explain the problem and the solution, to help others.
My software is:
Windows 7
Eclipse 4.4.1 (Luna SR1)
m2e 1.5.0.20140606-0033
(from eclipse repository: http://download.eclipse.org/releases/luna)
And I'm accessing internet through a proxy.
My problem was the same:
- Just installed m2e, went to menu: File > New > Other > Maven > Maven project > Next > Next.
- Selected "Catalog: All catalogs" and "Filter: maven-archetype-quickstart", then clicked on the search result, then on button Next.
- Then entered "Group Id: test_gr" and "Artifact Id: test_art", then clicked on Finish button.
- Got the "Could not resolve archetype..." error.
After a lot of try-and-error, and reading a lot of pages, I've finally found a solution to fix it. Some important points of the solution:
- It uses the default (embedded) Maven installation (3.2.1/1.5.0.20140605-2032) that comes with m2e.
- So no aditional (external) Maven installation is required.
- No special m2e config is required.
The solution is:
- Open eclipse.
- Restore m2e original preferences (if you changed any of them): Click on menu: Window > Preferences > Maven > Restore defaults. Do the same for all tree items under "Maven" item: Archetypes, Discovery, Errors/Warnings, Instalation, Lifecycle Mappings, Templates, User Interface, User Settings. Click on "OK" button.
- Copy (for example to a notepad window) the path of the user settings file. To see the path, click again on menu: Window > Preferences > Maven > User Settings, and the path is at the "User settings" textbox. You will have to write the path manually, since it is not posible to copy-and-paste. After coping the path to the notepad, don't close the Preferences window.
- At the Preferences window that is already open, click on the "open file" link. Close the Preferences window, and you will see the "settings.xml" file already openned in a Eclipse editor.
- The editor will have 2 tabs at the bottom: "Design" and "Source". Click on "Source" tab. You will see all the source code (xml).
- Delete all the source code: Click on the code, press control+a, press "del".
- Copy the following code to the editor (and customize the uppercased values):
<settings>
<proxies>
<proxy>
<active>true</active>
<protocol>http</protocol>
<host>YOUR.PROXY.IP.OR.NAME</host>
<port>YOUR PROXY PORT</port>
<username>YOUR PROXY USERNAME (OR EMPTY IF NOT REQUIRED)</username>
<password>YOUR PROXY PASSWORD (OR EMPTY IF NOT REQUIRED)</password>
<nonProxyHosts>YOUR PROXY EXCLUSION HOST LIST (OR EMPTY)</nonProxyHosts>
</proxy>
</proxies>
</settings>
- Save the file: control+s.
- Exit Eclipse: Menu File > Exit.
- Open in a Windows Explorer the path you copied (without the filename, just the path of directories).
- You will probaly see the xml file ("settings.xml") and a directoy ("repository"). Remove the directoy ("repository"): Right click > Delete > Yes.
- Start Eclipse.
- Now you will be able to create a maven project: File > New > Other > Maven > Maven project > Next > Next, select "Catalog: All catalogs" and "Filter: maven-archetype-quickstart", click on the search result, then on button Next, enter "Group Id: test_gr" and "Artifact Id: test_art", click on Finish button.
Finally, I would like to give a suggestion to m2e developers, to make config easier. After installing m2e from the internet (from a repository), m2e should check if Eclipse is using a proxy (Preferences > General > Network Connections). If Eclipse is using a proxy, the m2e should show a dialog to the user:
m2e has detected that Eclipse is using a proxy to access to the internet.
Would you like me to create a User settings file (settings.xml) for the embedded
Maven software?
[ Yes ] [ No ]
If the user clicks on Yes, then m2e should create automatically the "settings.xml" file by copying proxy values from Eclipse preferences.
Can I override and overload static methods in Java?
Parent class methods that are static are not part of a child class (although they are accessible), so there is no question of overriding it. Even if you add another static method in a subclass, identical to the one in its parent class, this subclass static method is unique and distinct from the static method in its parent class.
Stopping a thread after a certain amount of time
If you want the threads to stop when your program exits (as implied by your example), then make them daemon threads.
If you want your threads to die on command, then you have to do it by hand. There are various methods, but all involve doing a check in your thread's loop to see if it's time to exit (see Nix's example).
get current url in twig template?
{{ path(app.request.attributes.get('_route'),
app.request.attributes.get('_route_params')) }}
If you want to read it into a view variable:
{% set currentPath = path(app.request.attributes.get('_route'),
app.request.attributes.get('_route_params')) %}
The app
global view variable contains all sorts of useful shortcuts, such as app.session
and app.security.token.user
, that reference the services you might use in a controller.
How to add an image to an svg container using D3.js
My team also wanted to add images inside d3-drawn circles, and came up with the following (fiddle):
index.html:
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="timeline.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.js"></script>
<script src="https://code.jquery.com/jquery-2.2.4.js"
integrity="sha256-iT6Q9iMJYuQiMWNd9lDyBUStIq/8PuOW33aOqmvFpqI="
crossorigin="anonymous"></script>
<script src="./timeline.js"></script>
</head>
<body>
<div class="timeline"></div>
</body>
</html>
timeline.css:
.axis path,
.axis line,
.tick line,
.line {
fill: none;
stroke: #000000;
stroke-width: 1px;
}
timeline.js:
// container target
var elem = ".timeline";
var props = {
width: 1000,
height: 600,
class: "timeline-point",
// margins
marginTop: 100,
marginRight: 40,
marginBottom: 100,
marginLeft: 60,
// data inputs
data: [
{
x: 10,
y: 20,
key: "a",
image: "https://unsplash.it/300/300",
id: "a"
},
{
x: 20,
y: 10,
key: "a",
image: "https://unsplash.it/300/300",
id: "b"
},
{
x: 60,
y: 30,
key: "a",
image: "https://unsplash.it/300/300",
id: "c"
},
{
x: 40,
y: 30,
key: "a",
image: "https://unsplash.it/300/300",
id: "d"
},
{
x: 50,
y: 70,
key: "a",
image: "https://unsplash.it/300/300",
id: "e"
},
{
x: 30,
y: 50,
key: "a",
image: "https://unsplash.it/300/300",
id: "f"
},
{
x: 50,
y: 60,
key: "a",
image: "https://unsplash.it/300/300",
id: "g"
}
],
// y label
yLabel: "Y label",
yLabelLength: 50,
// axis ticks
xTicks: 10,
yTicks: 10
}
// component start
var Timeline = {};
/***
*
* Create the svg canvas on which the chart will be rendered
*
***/
Timeline.create = function(elem, props) {
// build the chart foundation
var svg = d3.select(elem).append('svg')
.attr('width', props.width)
.attr('height', props.height);
var g = svg.append('g')
.attr('class', 'point-container')
.attr("transform",
"translate(" + props.marginLeft + "," + props.marginTop + ")");
var g = svg.append('g')
.attr('class', 'line-container')
.attr("transform",
"translate(" + props.marginLeft + "," + props.marginTop + ")");
var xAxis = g.append('g')
.attr("class", "x axis")
.attr("transform", "translate(0," + (props.height - props.marginTop - props.marginBottom) + ")");
var yAxis = g.append('g')
.attr("class", "y axis");
svg.append("text")
.attr("class", "y label")
.attr("text-anchor", "end")
.attr("y", 1)
.attr("x", 0 - ((props.height - props.yLabelLength)/2) )
.attr("dy", ".75em")
.attr("transform", "rotate(-90)")
.text(props.yLabel);
// add placeholders for the axes
this.update(elem, props);
};
/***
*
* Update the svg scales and lines given new data
*
***/
Timeline.update = function(elem, props) {
var self = this;
var domain = self.getDomain(props);
var scales = self.scales(elem, props, domain);
self.drawPoints(elem, props, scales);
};
/***
*
* Use the range of values in the x,y attributes
* of the incoming data to identify the plot domain
*
***/
Timeline.getDomain = function(props) {
var domain = {};
domain.x = props.xDomain || d3.extent(props.data, function(d) { return d.x; });
domain.y = props.yDomain || d3.extent(props.data, function(d) { return d.y; });
return domain;
};
/***
*
* Compute the chart scales
*
***/
Timeline.scales = function(elem, props, domain) {
if (!domain) {
return null;
}
var width = props.width - props.marginRight - props.marginLeft;
var height = props.height - props.marginTop - props.marginBottom;
var x = d3.scale.linear()
.range([0, width])
.domain(domain.x);
var y = d3.scale.linear()
.range([height, 0])
.domain(domain.y);
return {x: x, y: y};
};
/***
*
* Create the chart axes
*
***/
Timeline.axes = function(props, scales) {
var xAxis = d3.svg.axis()
.scale(scales.x)
.orient("bottom")
.ticks(props.xTicks)
.tickFormat(d3.format("d"));
var yAxis = d3.svg.axis()
.scale(scales.y)
.orient("left")
.ticks(props.yTicks);
return {
xAxis: xAxis,
yAxis: yAxis
}
};
/***
*
* Use the general update pattern to draw the points
*
***/
Timeline.drawPoints = function(elem, props, scales, prevScales, dispatcher) {
var g = d3.select(elem).selectAll('.point-container');
var color = d3.scale.category10();
// add images
var image = g.selectAll('.image')
.data(props.data)
image.enter()
.append("pattern")
.attr("id", function(d) {return d.id})
.attr("class", "svg-image")
.attr("x", "0")
.attr("y", "0")
.attr("height", "70px")
.attr("width", "70px")
.append("image")
.attr("x", "0")
.attr("y", "0")
.attr("height", "70px")
.attr("width", "70px")
.attr("xlink:href", function(d) {return d.image})
var point = g.selectAll('.point')
.data(props.data);
// enter
point.enter()
.append("circle")
.attr("class", "point")
.on('mouseover', function(d) {
d3.select(elem).selectAll(".point").classed("active", false);
d3.select(this).classed("active", true);
if (props.onMouseover) {
props.onMouseover(d)
};
})
.on('mouseout', function(d) {
if (props.onMouseout) {
props.onMouseout(d)
};
})
// enter and update
point.transition()
.duration(1000)
.attr("cx", function(d) {
return scales.x(d.x);
})
.attr("cy", function(d) {
return scales.y(d.y);
})
.attr("r", 30)
.style("stroke", function(d) {
if (props.pointStroke) {
return d.color = props.pointStroke;
} else {
return d.color = color(d.key);
}
})
.style("fill", function(d) {
if (d.image) {
return ("url(#" + d.id + ")");
}
if (props.pointFill) {
return d.color = props.pointFill;
} else {
return d.color = color(d.key);
}
});
// exit
point.exit()
.remove();
// update the axes
var axes = this.axes(props, scales);
d3.select(elem).selectAll('g.x.axis')
.transition()
.duration(1000)
.call(axes.xAxis);
d3.select(elem).selectAll('g.y.axis')
.transition()
.duration(1000)
.call(axes.yAxis);
};
$(document).ready(function() {
Timeline.create(elem, props);
})
Delete all SYSTEM V shared memory and semaphores on UNIX-like systems
Since you mentioned that you're working on a NFS system, do you have access to those semaphores and shared memory? I think you misunderstood what they are, they are an API code that enables processes to communicate with each other, semaphores are a solution for preventing race conditions and for threads to communicate with each other, in simple answer, they do not leave any residue on any filesystem.
Unless you are using an socket or a pipe? Do you have the necessary permissions to remove them, why are they on an NFS system?
Hope this helps,
Best regards,
Tom.
How to make a custom LinkedIn share button
This works for me:
https://www.linkedin.com/shareArticle?mini=true&url=articleUrl&title=YourarticleTitle&summary=YourarticleSummary&source=YourarticleSource
You can use this link by replacing it with your content. It works 100%.
Returning string from C function
Either allocate the string on the stack on the caller side and pass it to your function:
void getStr(char *wordd, int length) {
...
}
int main(void) {
char wordd[10 + 1];
getStr(wordd, sizeof(wordd) - 1);
...
}
Or make the string static in getStr
:
char *getStr(void) {
static char wordd[10 + 1];
...
return wordd;
}
Or allocate the string on the heap:
char *getStr(int length) {
char *wordd = malloc(length + 1);
...
return wordd;
}
Installing Numpy on 64bit Windows 7 with Python 2.7.3
Download numpy-1.9.2+mkl-cp27-none-win32.whl from http://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy .
Copy the file to C:\Python27\Scripts
Run cmd from the above location and type
pip install numpy-1.9.2+mkl-cp27-none-win32.whl
You will hopefully get the below output:
Processing c:\python27\scripts\numpy-1.9.2+mkl-cp27-none-win32.whl
Installing collected packages: numpy
Successfully installed numpy-1.9.2
Hope that works for you.
EDIT 1
Adding @oneleggedmule 's suggestion:
You can also run the following command in the cmd:
pip2.7 install numpy-1.9.2+mkl-cp27-none-win_amd64.whl
Basically, writing pip alone also works perfectly (as in the original answer). Writing the version 2.7 can also be done for the sake of clarity or specification.
filtering a list using LINQ
var filtered = projects;
foreach (var tag in filteredTags) {
filtered = filtered.Where(p => p.Tags.Contains(tag))
}
The nice thing with this approach is that you can refine search results incrementally.
Undo git pull, how to bring repos to old state
This is the easiest way to revert you pull changes.
** Warning **
Please backup of your changed files because it will delete the newly created files and folders.
git reset --hard 9573e3e0
Where 9573e3e0
is your {Commit id}
Read file As String
Reworked the method set originating from -> the accepted answer
@JaredRummler An answer to your comment:
Read file As String
Won't this add an extra new line at the end of the string?
To prevent having a newline added at the end you can use a Boolean value set during the first loop as you will in the code example Boolean firstLine
public static String convertStreamToString(InputStream is) throws IOException {
// http://www.java2s.com/Code/Java/File-Input-Output/ConvertInputStreamtoString.htm
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
Boolean firstLine = true;
while ((line = reader.readLine()) != null) {
if(firstLine){
sb.append(line);
firstLine = false;
} else {
sb.append("\n").append(line);
}
}
reader.close();
return sb.toString();
}
public static String getStringFromFile (String filePath) throws IOException {
File fl = new File(filePath);
FileInputStream fin = new FileInputStream(fl);
String ret = convertStreamToString(fin);
//Make sure you close all streams.
fin.close();
return ret;
}
How to put a div in center of browser using CSS?
<html>
<head>
<style>
*
{
margin:0;
padding:0;
}
html, body
{
height:100%;
}
#distance
{
width:1px;
height:50%;
margin-bottom:-300px;
float:left;
}
#something
{
position:relative;
margin:0 auto;
text-align:left;
clear:left;
width:800px;
min-height:600px;
height:auto;
border: solid 1px #993333;
z-index: 0;
}
/* for Internet Explorer */
* html #something{
height: 600px;
}
</style>
</head>
<body>
<div id="distance"></div>
<div id="something">
</div>
</body>
</html>
Tested in FF2-3, IE6-7, Opera and works well!
Best way to move files between S3 buckets?
Update
As pointed out by alberge (+1), nowadays the excellent AWS Command Line Interface provides the most versatile approach for interacting with (almost) all things AWS - it meanwhile covers most services' APIs and also features higher level S3 commands for dealing with your use case specifically, see the AWS CLI reference for S3:
- sync - Syncs directories and S3 prefixes. Your use case is covered by Example 2 (more fine grained usage with
--exclude
, --include
and prefix handling etc. is also available):
The following sync command syncs objects under a specified prefix and bucket to objects under another specified prefix and bucket by copying s3 objects. [...]
aws s3 sync s3://from_my_bucket s3://to_my_other_bucket
For completeness, I'll mention that the lower level S3 commands are also still available via the s3api sub command, which would allow to directly translate any SDK based solution to the AWS CLI before adopting its higher level functionality eventually.
Initial Answer
Moving files between S3 buckets can be achieved by means of the PUT Object - Copy API (followed by DELETE Object):
This implementation of the PUT operation creates a copy of an object
that is already stored in Amazon S3. A PUT copy operation is the same
as performing a GET and then a PUT. Adding the request header,
x-amz-copy-source, makes the PUT operation copy the source object into
the destination bucket. Source
There are respective samples for all existing AWS SDKs available, see Copying Objects in a Single Operation. Naturally, a scripting based solution would be the obvious first choice here, so Copy an Object Using the AWS SDK for Ruby might be a good starting point; if you prefer Python instead, the same can be achieved via boto as well of course, see method copy_key()
within boto's S3 API documentation.
PUT Object
only copies files, so you'll need to explicitly delete a file via DELETE Object
still after a successful copy operation, but that will be just another few lines once the overall script handling the bucket and file names is in place (there are respective examples as well, see e.g. Deleting One Object Per Request).
How to keep form values after post
you can save them into a $_SESSION variable and then when the user calls that page again populate all the inputs with their respective session variables.
Environment variable in Jenkins Pipeline
To avoid problems of side effects after changing env
, especially using multiple nodes, it is better to set a temporary context.
One safe way to alter the environment is:
withEnv(['MYTOOL_HOME=/usr/local/mytool']) {
sh '$MYTOOL_HOME/bin/start'
}
This approach does not poison the env after the command execution.
How to add column if not exists on PostgreSQL?
CREATE OR REPLACE function f_add_col(_tbl regclass, _col text, _type regtype)
RETURNS bool AS
$func$
BEGIN
IF EXISTS (SELECT 1 FROM pg_attribute
WHERE attrelid = _tbl
AND attname = _col
AND NOT attisdropped) THEN
RETURN FALSE;
ELSE
EXECUTE format('ALTER TABLE %s ADD COLUMN %I %s', _tbl, _col, _type);
RETURN TRUE;
END IF;
END
$func$ LANGUAGE plpgsql;
Call:
SELECT f_add_col('public.kat', 'pfad1', 'int');
Returns TRUE
on success, else FALSE
(column already exists).
Raises an exception for invalid table or type name.
Why another version?
This could be done with a DO
statement, but DO
statements cannot return anything. And if it's for repeated use, I would create a function.
I use the object identifier types regclass
and regtype
for _tbl
and _type
which a) prevents SQL injection and b) checks validity of both immediately (cheapest possible way). The column name _col
has still to be sanitized for EXECUTE
with quote_ident()
. More explanation in this related answer:
format()
requires Postgres 9.1+. For older versions concatenate manually:
EXECUTE 'ALTER TABLE ' || _tbl || ' ADD COLUMN ' || quote_ident(_col) || ' ' || _type;
You can schema-qualify your table name, but you don't have to.
You can double-quote the identifiers in the function call to preserve camel-case and reserved words (but you shouldn't use any of this anyway).
I query pg_catalog
instead of the information_schema
. Detailed explanation:
Blocks containing an EXCEPTION
clause like the currently accepted answer are substantially slower. This is generally simpler and faster. The documentation:
Tip: A block containing an EXCEPTION
clause is significantly more
expensive to enter and exit than a block without one. Therefore, don't
use EXCEPTION
without need.
WebService Client Generation Error with JDK8
I was also getting similar type of error in Eclipse during testing a webservice program on glassfish 4.0 web server:
java.lang.AssertionError: org.xml.sax.SAXParseException; systemId: bundle://158.0:1/com/sun/tools/xjc/reader/xmlschema/bindinfo/binding.xsd; lineNumber: 52; columnNumber: 88; schema_reference: Failed to read schema document 'xjc.xsd', because 'bundle' access is not allowed due to restriction set by the accessExternalSchema property.
I have added javax.xml.accessExternalSchema = All
in jaxp.properties
, but doesnot work for me.
However I found a solution here below which work for me:
For GlassFish Server, I need to modify the domain.xml
of the GlassFish,
path :<path>/glassfish/domains/domain1
or domain2/config/domain.xml
) and add, <jvm-options>-Djavax.xml.accessExternalSchema=all</jvm-options>
under the <java-config>
tag
....
<java-config>
...
<jvm-options>-Djavax.xml.accessExternalSchema=all</jvm-options>
</java-config>
...and then restart the GlassFish server
How to define two angular apps / modules in one page?
Manual bootstrapping both the modules will work. Look at this
<!-- IN HTML -->
<div id="dvFirst">
<div ng-controller="FirstController">
<p>1: {{ desc }}</p>
</div>
</div>
<div id="dvSecond">
<div ng-controller="SecondController ">
<p>2: {{ desc }}</p>
</div>
</div>
// IN SCRIPT
var dvFirst = document.getElementById('dvFirst');
var dvSecond = document.getElementById('dvSecond');
angular.element(document).ready(function() {
angular.bootstrap(dvFirst, ['firstApp']);
angular.bootstrap(dvSecond, ['secondApp']);
});
Here is the link to the Plunker
http://plnkr.co/edit/1SdZ4QpPfuHtdBjTKJIu?p=preview
NOTE: In html, there is no ng-app
. id
has been used instead.
What is Android's file system?
When analysing a Galaxy Ace 2.2 in a hex editor. The hex seemed to point to the device using FAT16 as its file system. I thought this unusual. However Fat 16 is compatible with the Linux kernel.
Cannot implicitly convert type 'int' to 'short'
The problem is, that adding two Int16
results in an Int32
as others have already pointed out.
Your second question, why this problem doesn't already occur at the declaration of those two variables is explained here: http://msdn.microsoft.com/en-us/library/ybs77ex4%28v=VS.71%29.aspx:
short x = 32767;
In the preceding declaration, the integer literal 32767 is implicitly converted from int to short. If the integer literal does not fit into a short storage location, a compilation error will occur.
So, the reason why it works in your declaration is simply that the literals provided are known to fit into a short
.
How to create a XML object from String in Java?
If you can create a string xml you can easily transform it to the xml document object e.g. -
String xmlString = "<?xml version=\"1.0\" encoding=\"utf-8\"?><a><b></b><c></c></a>";
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder;
try {
builder = factory.newDocumentBuilder();
Document document = builder.parse(new InputSource(new StringReader(xmlString)));
} catch (Exception e) {
e.printStackTrace();
}
You can use the document object and xml parsing libraries or xpath to get back the ip address.
How do you normalize a file path in Bash?
I know this is an ancient question. I'm still offering an alternative. Recently I met the same issue and found no existing and portable command to do that. So I wrote the following shell script which includes a function that can do the trick.
#! /bin/sh
function normalize {
local rc=0
local ret
if [ $# -gt 0 ] ; then
# invalid
if [ "x`echo $1 | grep -E '^/\.\.'`" != "x" ] ; then
echo $1
return -1
fi
# convert to absolute path
if [ "x`echo $1 | grep -E '^\/'`" == "x" ] ; then
normalize "`pwd`/$1"
return $?
fi
ret=`echo $1 | sed 's;/\.\($\|/\);/;g' | sed 's;/[^/]*[^/.]\+[^/]*/\.\.\($\|/\);/;g'`
else
read line
normalize "$line"
return $?
fi
if [ "x`echo $ret | grep -E '/\.\.?(/|$)'`" != "x" ] ; then
ret=`normalize "$ret"`
rc=$?
fi
echo "$ret"
return $rc
}
https://gist.github.com/bestofsong/8830bdf3e5eb9461d27313c3c282868c
Transparent CSS background color
To achieve it, you have to modify the background-color
of the element.
Ways to create a (semi-) transparent color:
The CSS color name transparent
creates a completely transparent color.
Usage:
.transparent{
background-color: transparent;
}
Using rgba
or hsla
color functions, that allow you to add the alpha channel (opacity) to the rgb
and hsl
functions. Their alpha values range from 0 - 1.
Usage:
.semi-transparent-yellow{
background-color: rgba(255, 255, 0, 0.5);
}
.transparent{
background-color: hsla(0, 0%, 0%, 0);
}
Besides the already mentioned solutions, you can also use the HEX format with alpha value (#RRGGBBAA
or #RGBA
notation).
That's pretty new (contained by CSS Color Module Level 4), but already implemented in larger browsers (sorry, no IE).
This differs from the other solutions, as this treats the alpha channel (opacity) as a hexadecimal value as well, making it range from 0 - 255 (FF
).
Usage:
.semi-transparent-yellow{
background-color: #FFFF0080;
}
.transparent{
background-color: #0000;
}
You can try them out as well:
_x000D_
_x000D_
div {
position: absolute;
top: 50px;
left: 100px;
height: 100px;
width: 200px;
text-align: center;
line-height: 100px;
border: 1px dashed grey;
background-color: transparent;
}
_x000D_
<img src="https://via.placeholder.com/200x100">
<div>
Using `transparent`
</div>
_x000D_
_x000D_
_x000D_
_x000D_
_x000D_
div {
position: absolute;
top: 50px;
left: 100px;
height: 100px;
width: 200px;
text-align: center;
line-height: 100px;
border: 1px dashed grey;
background-color: rgba(0, 255, 0, 0.3);
}
_x000D_
<img src="https://via.placeholder.com/200x100">
<div>
Using `rgba()`
</div>
_x000D_
_x000D_
_x000D_
_x000D_
_x000D_
div {
position: absolute;
top: 50px;
left: 100px;
height: 100px;
width: 200px;
text-align: center;
line-height: 100px;
border: 1px dashed grey;
background-color: #FF000060
}
_x000D_
<img src="https://via.placeholder.com/200x100">
<div>
Using `#RRGGBBAA`
</div>
_x000D_
_x000D_
_x000D_
Base64 encoding and decoding in oracle
All the previous posts are correct. There's more than one way to skin a cat. Here is another way to do the same thing: (just replace "what_ever_you_want_to_convert" with your string and run it in Oracle:
set serveroutput on;
DECLARE
v_str VARCHAR2(1000);
BEGIN
--Create encoded value
v_str := utl_encode.text_encode
('what_ever_you_want_to_convert','WE8ISO8859P1', UTL_ENCODE.BASE64);
dbms_output.put_line(v_str);
--Decode the value..
v_str := utl_encode.text_decode
(v_str,'WE8ISO8859P1', UTL_ENCODE.BASE64);
dbms_output.put_line(v_str);
END;
/
source
Settings to Windows Firewall to allow Docker for Windows to share drive
My C drive stopped being shared with Docker after a recent Windows 10 update. I was getting the same problem saying it was blocked by the Windows firewall when attempting to reshare it.
Looking through the above solutions, I found something that worked for me that is simpler than anything else I saw on this page. In Control Panel\All Control Panel Items\Network and Sharing Center, on the vEthernet (DockerNAT) connection, I unchecked the property File and Printer Sharing for Microsoft Networks and saved the setting. Then I checked the property again to reenable it and saved it again.
At this point, I was able to reshare the C drive in Docker settings. I have no idea why this worked but it was not a firewall problem, which already have an entry for DockerSmbMount.
Pick any kind of file via an Intent in Android
Not for camera but for other files..
In my device I have ES File Explorer
installed and This simply thing works in my case..
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("file/*");
startActivityForResult(intent, PICKFILE_REQUEST_CODE);
EditText underline below text property
If you don't have to support devices with API < 21, use backgroundHint in xml, for example:
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:hint="Task Name"
android:ems="10"
android:id="@+id/task_name"
android:layout_marginBottom="15dp"
android:textAlignment="center"
android:textColor="@android:color/white"
android:textColorLink="@color/blue"
android:textColorHint="@color/blue"
android:backgroundTint="@color/lighter_blue" />
For better support and fallbacks use @Akariuz solution.
backgroundHint is the most painless solution, but not backward compatible, based on your requirements make a call.
Using (Ana)conda within PyCharm
this might be repetitive.
I was trying to use pycharm to run flask - had anaconda 3, pycharm 2019.1.1 and windows 10. Created a new conda environment - it threw errors.
Followed these steps -
Used the cmd to install python and flask after creating environment as suggested above.
Followed this answer.
- As suggested above, went to Run -> Edit Configurations and changed the environment there as well as in (2).
Obviously kept the correct python interpreter (the one in the environment) everywhere.
How to draw a graph in LaTeX?
In my experience, I always just use an external program to generate the graph (mathematica, gnuplot, matlab, etc.) and export the graph as a pdf or eps file. Then I include it into the document with includegraphics
.
How to get the last char of a string in PHP?
As of PHP 7.1.0, negative string offsets are also supported.
So, if you keep up with the times, you can access the last character in the string like this:
$str[-1]
DEMO
At the request of a @mickmackusa, I supplement my answer with possible ways of application:
<?php
$str='abcdef';
var_dump($str[-2]); // => string(1) "e"
$str[-3]='.';
var_dump($str); // => string(6) "abc.ef"
var_dump(isset($str[-4])); // => bool(true)
var_dump(isset($str[-10])); // => bool(false)
What's the difference between an id and a class?
IDs are unique. Classes aren't. Elements can also have multiple classes. Also classes can be dynamically added and removed to an element.
Anywhere you can use an ID you could use a class instead. The reverse is not true.
The convention seems to be to use IDs for page elements that are on every page (like "navbar" or "menu") and classes for everything else but this is only convention and you'll find wide variance in usage.
One other difference is that for form input elements, the <label>
element references a field by ID so you need to use IDs if you're going to use <label>
. is an accessibility thing and you really should use it.
In years gone by IDs were also preferred because they're easily accessible in Javascript (getElementById). With the advent of jQuery and other Javascript frameworks this is pretty much a non-issue now.
Open web in new tab Selenium + Python
You can achieve the opening/closing of a tab by the combination of keys COMMAND + T or COMMAND + W (OSX). On other OSs you can use CONTROL + T / CONTROL + W.
In selenium you can emulate such behavior.
You will need to create one webdriver and as many tabs as the tests you need.
Here it is the code.
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
driver = webdriver.Firefox()
driver.get("http://www.google.com/")
#open tab
driver.find_element_by_tag_name('body').send_keys(Keys.COMMAND + 't')
# You can use (Keys.CONTROL + 't') on other OSs
# Load a page
driver.get('http://stackoverflow.com/')
# Make the tests...
# close the tab
# (Keys.CONTROL + 'w') on other OSs.
driver.find_element_by_tag_name('body').send_keys(Keys.COMMAND + 'w')
driver.close()
How to use PHP to connect to sql server
Try this to be able to catch the thrown exception:
$server_name = "your server name";
$database_name = "your database name";
try {
$conn = new PDO("sqlsrv:Server=$server_name;Database=$database_name;ConnectionPooling=0", "user_name", "password");
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
$e->getMessage();
}
How to embed fonts in CSS?
One of the best source of information on this topic is Paul Irish's Bulletproof @font-face syntax article.
Read it and you will end with something like:
/* definition */
@font-face {
font-family: EntezareZohoor2;
src: url('fonts/EntezareZohoor2.eot');
src: url('fonts/EntezareZohoor2.eot?') format('?'),
url('fonts/EntezareZohoor2.woff') format('woff'),
url('fonts/EntezareZohoor2.ttf') format('truetype');
font-weight: normal;
font-style: normal;
}
/* use */
body {
font-family: EntezareZohoor2, Tahoma, serif;
}
How to enumerate a range of numbers starting at 1
As you already mentioned, this is straightforward to do in Python 2.6 or newer:
enumerate(range(2000, 2005), 1)
Python 2.5 and older do not support the start
parameter so instead you could create two range objects and zip them:
r = xrange(2000, 2005)
r2 = xrange(1, len(r) + 1)
h = zip(r2, r)
print h
Result:
[(1, 2000), (2, 2001), (3, 2002), (4, 2003), (5, 2004)]
If you want to create a generator instead of a list then you can use izip instead.
C#: How do you edit items and subitems in a listview?
I use a hidden textbox to edit all the listview items/subitems. The only problem is that the textbox needs to disappear as soon as any event takes place outside the textbox and the listview doesn't trigger the scroll event so if you scroll the listview the textbox will still be visible.
To bypass this problem I created the Scroll event with this overrided listview.
Here is my code, I constantly reuse it so it might be help for someone:
ListViewItem.ListViewSubItem SelectedLSI;
private void listView2_MouseUp(object sender, MouseEventArgs e)
{
ListViewHitTestInfo i = listView2.HitTest(e.X, e.Y);
SelectedLSI = i.SubItem;
if (SelectedLSI == null)
return;
int border = 0;
switch (listView2.BorderStyle)
{
case BorderStyle.FixedSingle:
border = 1;
break;
case BorderStyle.Fixed3D:
border = 2;
break;
}
int CellWidth = SelectedLSI.Bounds.Width;
int CellHeight = SelectedLSI.Bounds.Height;
int CellLeft = border + listView2.Left + i.SubItem.Bounds.Left;
int CellTop =listView2.Top + i.SubItem.Bounds.Top;
// First Column
if (i.SubItem == i.Item.SubItems[0])
CellWidth = listView2.Columns[0].Width;
TxtEdit.Location = new Point(CellLeft, CellTop);
TxtEdit.Size = new Size(CellWidth, CellHeight);
TxtEdit.Visible = true;
TxtEdit.BringToFront();
TxtEdit.Text = i.SubItem.Text;
TxtEdit.Select();
TxtEdit.SelectAll();
}
private void listView2_MouseDown(object sender, MouseEventArgs e)
{
HideTextEditor();
}
private void listView2_Scroll(object sender, EventArgs e)
{
HideTextEditor();
}
private void TxtEdit_Leave(object sender, EventArgs e)
{
HideTextEditor();
}
private void TxtEdit_KeyUp(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter || e.KeyCode == Keys.Return)
HideTextEditor();
}
private void HideTextEditor()
{
TxtEdit.Visible = false;
if (SelectedLSI != null)
SelectedLSI.Text = TxtEdit.Text;
SelectedLSI = null;
TxtEdit.Text = "";
}
Find Java classes implementing an interface
Spring can do this for you...
BeanDefinitionRegistry bdr = new SimpleBeanDefinitionRegistry();
ClassPathBeanDefinitionScanner s = new ClassPathBeanDefinitionScanner(bdr);
TypeFilter tf = new AssignableTypeFilter(CLASS_YOU_WANT.class);
s.addIncludeFilter(tf);
s.scan("package.you.want1", "package.you.want2");
String[] beans = bdr.getBeanDefinitionNames();
N.B. The TypeFilter is important if you want the correct results!
You can also use exclusion filters here instead.
The Scanner can be found in the spring-context jar, the registry in spring-beans, the type filter is in spring-core.
Set Jackson Timezone for Date deserialization
Looks like older answers were fine for older Jackson versions, but since objectMapper
has method setTimeZone(tz)
, setting time zone on a dateFormat is totally ignored.
How to properly setup timeZone to the ObjectMapper in Jackson version 2.11.0:
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setTimeZone(TimeZone.getTimeZone("Europe/Warsaw"));
Full example
@Test
void test() throws Exception {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.findAndRegisterModules();
objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
JavaTimeModule module = new JavaTimeModule();
objectMapper.registerModule(module);
objectMapper.setTimeZone(TimeZone.getTimeZone("Europe/Warsaw"));
ZonedDateTime now = ZonedDateTime.now();
String converted = objectMapper.writeValueAsString(now);
ZonedDateTime restored = objectMapper.readValue(converted, ZonedDateTime.class);
System.out.println("serialized: " + now);
System.out.println("converted: " + converted);
System.out.println("restored: " + restored);
Assertions.assertThat(now).isEqualTo(restored);
}
`
How to resolve "The requested URL was rejected. Please consult with your administrator." error?
I have faced the same issue using Google Chrome browser. Same website was opening normally using the incognito mode and different browsers. At first, I cleared cached files and cookies over the past 24 hours, but this didn't help.
I realized that my first visit to the website was during the past 10 days. So, I cleared cached files and cookies over the past 4 weeks and that resolved the problem.
Note: I didn't clear my browsing history data
Scanf/Printf double variable C
As far as I read manual pages, scanf says that 'l' length modifier indicates (in case of floating points) that the argument is of type double rather than of type float, so you can have 'lf, le, lg'.
As for printing, officially, the manual says that 'l' applies only to integer types. So it might be not supported on some systems or by some standards. For instance, I get the following error message when compiling with gcc -Wall -Wextra -pedantic
a.c:6:1: warning: ISO C90 does not support the ‘%lf’ gnu_printf format [-Wformat=]
So you may want to doublecheck if your standard supports the syntax.
To conclude, I would say that you read with '%lf' and you print with '%f'.
Less aggressive compilation with CSS3 calc
A very common usecase of calc is take 100% width and adding some margin around the element.
One can do so with:
@someMarginVariable = 15px;
margin: @someMarginVariable;
width: calc(~"100% - "@someMarginVariable*2);
width: -moz-calc(~"100% - "@someMarginVariable*2);
width: -webkit-calc(~"100% - "@someMarginVariable*2);
What is "overhead"?
Wikipedia has us covered:
In computer science, overhead is
generally considered any combination
of excess or indirect computation
time, memory, bandwidth, or other
resources that are required to attain
a particular goal. It is a special
case of engineering overhead.
ArrayAdapter in android to create simple listview
But again main doubt why TextView resource id it needs?
Look at the constructor and the params.
public ArrayAdapter (Context context, int resource, int textViewResourceId, T[] objects)
Added in API level 1 Constructor
Parameters
context
The current context.
resource
The resource ID for a
layout file containing a layout to use when instantiating views.
textViewResourceId
The id of the TextView within the layout resource
to be populated objects The objects to represent in the ListView
.
android.R.id.text1
refers to the id of text in android resource. So you need not have the one in your activity.
Here's the full list
http://developer.android.com/reference/android/R.id.html
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, android.R.id.text1, values);
this
refers to activity context
android.R.layout.simple_list_item_1
simple_list_item_1 is the layout in android.R.layout.
android.R.id.text1
refers to the android resource id.
values
is a string array from the link you provided
http://developer.android.com/reference/android/R.layout.html
How do I check if a C++ std::string starts with a certain string, and convert a substring to an int?
Given that both strings — argv[1]
and "--foo"
— are C strings, @FelixDombek's answer is hands-down the best solution.
Seeing the other answers, however, I thought it worth noting that, if your text is already available as a std::string
, then a simple, zero-copy, maximally efficient solution exists that hasn't been mentioned so far:
const char * foo = "--foo";
if (text.rfind(foo, 0) == 0)
foo_value = text.substr(strlen(foo));
And if foo is already a string:
std::string foo("--foo");
if (text.rfind(foo, 0) == 0)
foo_value = text.substr(foo.length());
Connecting to MySQL from Android with JDBC
this code runs permanently!!! created by diko(Turkey)
public void mysql() {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
thrd1 = new Thread(new Runnable() {
public void run() {
while (!Thread.interrupted()) {
try {
Thread.sleep(100);
} catch (InterruptedException e1) {
}
if (con == null) {
try {
con = DriverManager.getConnection("jdbc:mysql://192.168.1.45:3306/deneme", "ali", "12345");
} catch (SQLException e) {
e.printStackTrace();
con = null;
}
if ((thrd2 != null) && (!thrd2.isAlive()))
thrd2.start();
}
}
}
});
if ((thrd1 != null) && (!thrd1.isAlive())) thrd1.start();
thrd2 = new Thread(new Runnable() {
public void run() {
while (!Thread.interrupted()) {
if (con != null) {
try {
// con = DriverManager.getConnection("jdbc:mysql://192.168.1.45:3306/deneme", "ali", "12345");
Statement st = con.createStatement();
String ali = "'fff'";
st.execute("INSERT INTO deneme (name) VALUES(" + ali + ")");
// ResultSet rs = st.executeQuery("select * from deneme");
// ResultSetMetaData rsmd = rs.getMetaData();
// String result = new String();
// while (rs.next()) {
// result += rsmd.getColumnName(1) + ": " + rs.getInt(1) + "\n";
// result += rsmd.getColumnName(2) + ": " + rs.getString(2) + "\n";
// }
} catch (SQLException e) {
e.printStackTrace();
con = null;
}
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
} else {
try {
Thread.sleep(300);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
});
}
How do I generate a constructor from class fields using Visual Studio (and/or ReSharper)?
In Visual Studio 2015 Update3 I have this feature.
Just by highlighting properties and then press Ctrl + . and then press Generate Constructor.
For example, if you've highlighted two properties it will suggest you to create a constructor with two parameters and if you've selected three it will suggest one with three parameters and so on.
It also works with Visual Studio 2017 and 2019.
How to change the background color on a input checkbox with css?
I always use pseudo elements :before
and :after
for changing the appearance of checkboxes and radio buttons. it's works like a charm.
Refer this link for more info
CODEPEN
Steps
- Hide the default checkbox using css rules like
visibility:hidden
or opacity:0
or position:absolute;left:-9999px
etc.
- Create a fake checkbox using
:before
element and pass either an empty or a non-breaking space '\00a0'
;
- When the checkbox is in
:checked
state, pass the unicode content: "\2713"
, which is a checkmark;
- Add
:focus
style to make the checkbox accessible.
- Done
Here is how I did it.
_x000D_
_x000D_
.box {_x000D_
background: #666666;_x000D_
color: #ffffff;_x000D_
width: 250px;_x000D_
padding: 10px;_x000D_
margin: 1em auto;_x000D_
}_x000D_
p {_x000D_
margin: 1.5em 0;_x000D_
padding: 0;_x000D_
}_x000D_
input[type="checkbox"] {_x000D_
visibility: hidden;_x000D_
}_x000D_
label {_x000D_
cursor: pointer;_x000D_
}_x000D_
input[type="checkbox"] + label:before {_x000D_
border: 1px solid #333;_x000D_
content: "\00a0";_x000D_
display: inline-block;_x000D_
font: 16px/1em sans-serif;_x000D_
height: 16px;_x000D_
margin: 0 .25em 0 0;_x000D_
padding: 0;_x000D_
vertical-align: top;_x000D_
width: 16px;_x000D_
}_x000D_
input[type="checkbox"]:checked + label:before {_x000D_
background: #fff;_x000D_
color: #333;_x000D_
content: "\2713";_x000D_
text-align: center;_x000D_
}_x000D_
input[type="checkbox"]:checked + label:after {_x000D_
font-weight: bold;_x000D_
}_x000D_
_x000D_
input[type="checkbox"]:focus + label::before {_x000D_
outline: rgb(59, 153, 252) auto 5px;_x000D_
}
_x000D_
<div class="content">_x000D_
<div class="box">_x000D_
<p>_x000D_
<input type="checkbox" id="c1" name="cb">_x000D_
<label for="c1">Option 01</label>_x000D_
</p>_x000D_
<p>_x000D_
<input type="checkbox" id="c2" name="cb">_x000D_
<label for="c2">Option 02</label>_x000D_
</p>_x000D_
<p>_x000D_
<input type="checkbox" id="c3" name="cb">_x000D_
<label for="c3">Option 03</label>_x000D_
</p>_x000D_
</div>_x000D_
</div>
_x000D_
_x000D_
_x000D_
Much more stylish using :before
and :after
_x000D_
_x000D_
body{_x000D_
font-family: sans-serif; _x000D_
}_x000D_
_x000D_
.container {_x000D_
margin-top: 50px;_x000D_
margin-left: 20px;_x000D_
margin-right: 20px;_x000D_
}_x000D_
.checkbox {_x000D_
width: 100%;_x000D_
margin: 15px auto;_x000D_
position: relative;_x000D_
display: block;_x000D_
}_x000D_
_x000D_
.checkbox input[type="checkbox"] {_x000D_
width: auto;_x000D_
opacity: 0.00000001;_x000D_
position: absolute;_x000D_
left: 0;_x000D_
margin-left: -20px;_x000D_
}_x000D_
.checkbox label {_x000D_
position: relative;_x000D_
}_x000D_
.checkbox label:before {_x000D_
content: '';_x000D_
position: absolute;_x000D_
left: 0;_x000D_
top: 0;_x000D_
margin: 4px;_x000D_
width: 22px;_x000D_
height: 22px;_x000D_
transition: transform 0.28s ease;_x000D_
border-radius: 3px;_x000D_
border: 2px solid #7bbe72;_x000D_
}_x000D_
.checkbox label:after {_x000D_
content: '';_x000D_
display: block;_x000D_
width: 10px;_x000D_
height: 5px;_x000D_
border-bottom: 2px solid #7bbe72;_x000D_
border-left: 2px solid #7bbe72;_x000D_
-webkit-transform: rotate(-45deg) scale(0);_x000D_
transform: rotate(-45deg) scale(0);_x000D_
transition: transform ease 0.25s;_x000D_
will-change: transform;_x000D_
position: absolute;_x000D_
top: 12px;_x000D_
left: 10px;_x000D_
}_x000D_
.checkbox input[type="checkbox"]:checked ~ label::before {_x000D_
color: #7bbe72;_x000D_
}_x000D_
_x000D_
.checkbox input[type="checkbox"]:checked ~ label::after {_x000D_
-webkit-transform: rotate(-45deg) scale(1);_x000D_
transform: rotate(-45deg) scale(1);_x000D_
}_x000D_
_x000D_
.checkbox label {_x000D_
min-height: 34px;_x000D_
display: block;_x000D_
padding-left: 40px;_x000D_
margin-bottom: 0;_x000D_
font-weight: normal;_x000D_
cursor: pointer;_x000D_
vertical-align: sub;_x000D_
}_x000D_
.checkbox label span {_x000D_
position: absolute;_x000D_
top: 50%;_x000D_
-webkit-transform: translateY(-50%);_x000D_
transform: translateY(-50%);_x000D_
}_x000D_
.checkbox input[type="checkbox"]:focus + label::before {_x000D_
outline: 0;_x000D_
}
_x000D_
<div class="container"> _x000D_
<div class="checkbox">_x000D_
<input type="checkbox" id="checkbox" name="" value="">_x000D_
<label for="checkbox"><span>Checkbox</span></label>_x000D_
</div>_x000D_
_x000D_
<div class="checkbox">_x000D_
<input type="checkbox" id="checkbox2" name="" value="">_x000D_
<label for="checkbox2"><span>Checkbox</span></label>_x000D_
</div>_x000D_
</div>
_x000D_
_x000D_
_x000D_
Eclipse/Java code completion not working
I had this problem and like @Marc, only on a particular class. I discovered that I needed to designate Open With = Java Editor. As a Eclipse newbie I hadn't even realized that I was just using a plain text editor.
In the package explorer, right-click the file and chose "Open With".
How to check if a directory containing a file exist?
To check if a folder exists or not, you can simply use the exists()
method:
// Create a File object representing the folder 'A/B'
def folder = new File( 'A/B' )
// If it doesn't exist
if( !folder.exists() ) {
// Create all folders up-to and including B
folder.mkdirs()
}
// Then, write to file.txt inside B
new File( folder, 'file.txt' ).withWriterAppend { w ->
w << "Some text\n"
}
Sharing a variable between multiple different threads
AtomicBoolean
The succinct Answer by NPE sums up your three options. I'll add some example code for the second item listed there: AtomicBoolean
.
You can think of the AtomicBoolean
class as providing some thread-safety wrapping around a boolean
value.
If you instantiate the AtomicBoolean
only once, then you need not worry about the visibility issue in the Java Memory Model that requires volatile
as a solution (the first item in that other Answer). Also, you need not concern yourself with synchronization (the third item in that other Answer) because AtomicBoolean
performs that function of protecting multi-threaded access to its internal boolean value.
Let's look at some example code.
Firstly, in modern Java we generally do not address the Thread
class directly. We now have the Executors framework to simplify handling of threads.
This code below is using Project Loom technology, coming to a future version of Java. Preliminary builds available now, built on early-access Java 16. This makes for simpler coding, with ExecutorService
being AutoCloseable
for convenient use with try-with-resources syntax. But Project Loom is not related to the point of this Answer; it just makes for simpler code that is easier to understand as “structured concurrency”.
The idea here is that we have three threads: the original thread, plus a ExecutorService
that will create two more threads. The two new threads both report the value of our AtomicBoolean
. The first new thread does so immediately, while the other waits 10 seconds before reporting. Meanwhile, our main thread sleeps for 5 seconds, wakes, changes the AtomicBoolean
object’s contained value, and then waits for that second thread to wake and complete its work the report on the now-altered AtomicBoolean
contained value. While we are installing seconds between each event, this is merely for dramatic demonstration. The real point is that these threads could coincidently try to access the AtomicBoolean
simultaneously, but that object will protect access to its internal boolean value in a thread-safe manner. Protecting against simultaneous access is the job of the Atomic…
classes.
try (
ExecutorService executorService = Executors.newVirtualThreadExecutor() ;
)
{
AtomicBoolean flag = new AtomicBoolean( true );
// This task, when run, will immediately report the flag.
Runnable task1 = ( ) -> System.out.println( "First task reporting flag = " + flag.get() + ". " + Instant.now() );
// This task, when run, will wait several seconds, then report the flag. Meanwhile, code below waits a shorter time before *changing* the flag.
Runnable task2 = ( ) -> {
try { Thread.sleep( Duration.ofSeconds( 10 ) ); } catch ( InterruptedException e ) { e.printStackTrace(); }
System.out.println( "Second task reporting flag = " + flag.get() + ". " + Instant.now() );
};
executorService.submit( task1 );
executorService.submit( task2 );
// Wait for first task to complete, so sleep here briefly. But wake before the sleeping second task awakens.
try { Thread.sleep( Duration.ofSeconds( 5 ) ); } catch ( InterruptedException e ) { e.printStackTrace(); }
System.out.println( "INFO - Original thread waking up, and setting flag to false. " + Instant.now() );
flag.set( false );
}
// At this point, with Project Loom technology, the flow-of-control blocks until the submitted tasks are done.
// Also, the `ExecutorService` is automatically closed/shutdown by this point, via try-with-resources syntax.
System.out.println( "INFO - Tasks on background threads are done. The `AtomicBoolean` and threads are gone." + Instant.now() );
Methods such as AtomicBoolean#get
and AtomicBoolean#set
are built to be thread-safe, to internally protect access to the boolean value nested within. Read up on the various other methods as well.
When run:
First task reporting flag = true. 2021-01-05T06:42:17.367337Z
INFO - Original thread waking up, and setting flag to false. 2021-01-05T06:42:22.367456Z
Second task reporting flag = false. 2021-01-05T06:42:27.369782Z
INFO - Tasks on background threads are done. The `AtomicBoolean` and threads are gone.2021-01-05T06:42:27.372597Z
Pro Tip: When engaging in threaded code in Java, always study the excellent book, Java Concurrency in Practice by Brian Goetz et al.
How to format a DateTime in PowerShell
I needed the time and a slight variation on format. This works great for my purposes:
$((get-date).ToLocalTime()).ToString("yyyy-MM-dd HHmmss")
2019-08-16 215757
According to @mklement0 in comments, this should yield the same result:
(get-date).ToString("yyyy-MM-dd HHmmss")
How to Apply Mask to Image in OpenCV?
You can use the mask to copy only the region of interest of an original image to a destination one:
cvCopy(origImage,destImage,mask);
where mask
should be an 8-bit single channel array.
See more at the OpenCV docs
How to find whether a number belongs to a particular range in Python?
To check whether some number n is in the inclusive range denoted by the two number a and b you do either
if a <= n <= b:
print "yes"
else:
print "no"
use the replace >=
and <=
with >
and <
to check whether n
is in the exclusive range denoted by a
and b
(i.e. a
and b
are not themselves members of the range).
Range will produce an arithmetic progression defined by the two (or three) arguments converted to integers. See the documentation. This is not what you want I guess.
Git push rejected "non-fast-forward"
In Eclipse do the following:
GIT Repositories > Remotes > Origin > Right click and say fetch
GIT Repositories > Remote Tracking > Select your branch and say merge
Go to project, right click on your file and say Fetch from upstream.
String Comparison in Java
Leading from answers from @Bozho and @aioobe, lexicographic comparisons are similar to the ordering that one might find in a dictionary.
The Java String class provides the .compareTo ()
method in order to lexicographically compare Strings. It is used like this "apple".compareTo ("banana")
.
The return of this method is an int
which can be interpreted as follows:
- returns < 0 then the String calling the method is lexicographically first (comes first in a dictionary)
- returns == 0 then the two strings are lexicographically equivalent
- returns > 0 then the parameter passed to the
compareTo
method is lexicographically first.
More specifically, the method provides the first non-zero difference in ASCII values.
Thus "computer".compareTo ("comparison")
will return a value of (int) 'u' - (int) 'a'
(20). Since this is a positive result, the parameter ("comparison"
) is lexicographically first.
There is also a variant .compareToIgnoreCase ()
which will return 0
for "a".compareToIgnoreCase ("A");
for example.
Nested select statement in SQL Server
You need to alias the subquery.
SELECT name FROM (SELECT name FROM agentinformation) a
or to be more explicit
SELECT a.name FROM (SELECT name FROM agentinformation) a
ComboBox.SelectedText doesn't give me the SelectedText
To get selected item, you have to use SELECTEDITEM property of comboBox. And since this is an Object, if you wanna assign it to a string, you have to convert it to string, by using ToString() method:
string myItem = comboBox1.SelectedItem.ToString(); //this does the trick
MVC DateTime binding with incorrect date format
I've been having the same issue with short date format binding to DateTime model properties. After looking at many different examples (not only concerning DateTime) I put together the follwing:
using System;
using System.Globalization;
using System.Web.Mvc;
namespace YourNamespaceHere
{
public class CustomDateBinder : IModelBinder
{
public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
if (controllerContext == null)
throw new ArgumentNullException("controllerContext", "controllerContext is null.");
if (bindingContext == null)
throw new ArgumentNullException("bindingContext", "bindingContext is null.");
var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
if (value == null)
throw new ArgumentNullException(bindingContext.ModelName);
CultureInfo cultureInf = (CultureInfo)CultureInfo.CurrentCulture.Clone();
cultureInf.DateTimeFormat.ShortDatePattern = "dd/MM/yyyy";
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, value);
try
{
var date = value.ConvertTo(typeof(DateTime), cultureInf);
return date;
}
catch (Exception ex)
{
bindingContext.ModelState.AddModelError(bindingContext.ModelName, ex);
return null;
}
}
}
public class NullableCustomDateBinder : IModelBinder
{
public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
if (controllerContext == null)
throw new ArgumentNullException("controllerContext", "controllerContext is null.");
if (bindingContext == null)
throw new ArgumentNullException("bindingContext", "bindingContext is null.");
var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
if (value == null) return null;
CultureInfo cultureInf = (CultureInfo)CultureInfo.CurrentCulture.Clone();
cultureInf.DateTimeFormat.ShortDatePattern = "dd/MM/yyyy";
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, value);
try
{
var date = value.ConvertTo(typeof(DateTime), cultureInf);
return date;
}
catch (Exception ex)
{
bindingContext.ModelState.AddModelError(bindingContext.ModelName, ex);
return null;
}
}
}
}
To keep with the way that routes etc are regiseterd in the Global ASAX file I also added a new sytatic class to the App_Start folder of my MVC4 project named CustomModelBinderConfig:
using System;
using System.Web.Mvc;
namespace YourNamespaceHere
{
public static class CustomModelBindersConfig
{
public static void RegisterCustomModelBinders()
{
ModelBinders.Binders.Add(typeof(DateTime), new CustomModelBinders.CustomDateBinder());
ModelBinders.Binders.Add(typeof(DateTime?), new CustomModelBinders.NullableCustomDateBinder());
}
}
}
I then just call the static RegisterCustomModelBinders from my Global ASASX Application_Start like this:
protected void Application_Start()
{
/* bla blah bla the usual stuff and then */
CustomModelBindersConfig.RegisterCustomModelBinders();
}
An important note here is that if you write a DateTime value to a hiddenfield like this:
@Html.HiddenFor(model => model.SomeDate) // a DateTime property
@Html.Hiddenfor(model => model) // a model that is of type DateTime
I did that and the actual value on the page was in the format "MM/dd/yyyy hh:mm:ss tt" instead of "dd/MM/yyyy hh:mm:ss tt" like I wanted. This caused my model validation to either fail or return the wrong date (obviously swapping the day and month values around).
After a lot of head scratching and failed attempts the solution was to set the culture info for every request by doing this in the Global.ASAX:
protected void Application_BeginRequest()
{
CultureInfo cInf = new CultureInfo("en-ZA", false);
// NOTE: change the culture name en-ZA to whatever culture suits your needs
cInf.DateTimeFormat.DateSeparator = "/";
cInf.DateTimeFormat.ShortDatePattern = "dd/MM/yyyy";
cInf.DateTimeFormat.LongDatePattern = "dd/MM/yyyy hh:mm:ss tt";
System.Threading.Thread.CurrentThread.CurrentCulture = cInf;
System.Threading.Thread.CurrentThread.CurrentUICulture = cInf;
}
It won't work if you stick it in Application_Start or even Session_Start since that assigns it to the current thread for the session. As you well know, web applications are stateless so the thread that serviced your request previously is ot the same thread serviceing your current request hence your culture info has gone to the great GC in the digital sky.
Thanks go to:
Ivan Zlatev - http://ivanz.com/2010/11/03/custom-model-binding-using-imodelbinder-in-asp-net-mvc-two-gotchas/
garik - https://stackoverflow.com/a/2468447/578208
Dmitry - https://stackoverflow.com/a/11903896/578208
Determine if Android app is being used for the first time
If you are looking for a simple way, here it is.
Create a utility class like this,
public class ApplicationUtils {
/**
* Sets the boolean preference value
*
* @param context the current context
* @param key the preference key
* @param value the value to be set
*/
public static void setBooleanPreferenceValue(Context context, String key, boolean value) {
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
sp.edit().putBoolean(key, value).apply();
}
/**
* Get the boolean preference value from the SharedPreference
*
* @param context the current context
* @param key the preference key
* @return the the preference value
*/
public static boolean getBooleanPreferenceValue(Context context, String key) {
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
return sp.getBoolean(key, false);
}
}
At your Main Activity, onCreate()
if(!ApplicationUtils.getBooleanPreferenceValue(this,"isFirstTimeExecution")){
Log.d(TAG, "First time Execution");
ApplicationUtils.setBooleanPreferenceValue(this,"isFirstTimeExecution",true);
// do your first time execution stuff here,
}
Android: how to make keyboard enter button say "Search" and handle its click?
In the layout set your input method options to search.
<EditText
android:imeOptions="actionSearch"
android:inputType="text" />
In the java add the editor action listener.
editText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (actionId == EditorInfo.IME_ACTION_SEARCH) {
performSearch();
return true;
}
return false;
}
});
How to set Oracle's Java as the default Java in Ubuntu?
I put the line:
export JAVA_HOME=/usr/lib/jvm/java-7-oracle
in my ~/.bashrc
file.
/usr/lib/jvm/java7-oracle
should be a symbolic link pointing to /usr/lib/jvm/java-7-oracle-[version number here]
.
The reason it's a symbolic link is that in case there's a new version of the JVM, you don't need to update your .bashrc
file, it should automatically point to the new version.
If you want to set JAVA_HOME
environment variables globally and at system level means use should set in /etc/environment
file.
Starting iPhone app development in Linux?
There's a framework called Rhodes.
The concept is based on Ruby on Rails and you develop your mobile app in Ruby and HTML, and you can write your code in a Linux environment. You can then create an account at Rhohub, where you add the code (through GitHub), and it allows you to compile it for iPhone, Blackberry, Android, Windows Mobile and Symbian, all off the same code. You don't have to code in Objective-C for iPhone, nor Java for Android, etc. It does the conversions for you. All you need to do is stick to the Rules for creating an iPhone application (or the Phone's you want to develop for) so it can be accepted at iTunes (or the equivalent market).
This will allow you to add the app to iTunes as well.
I have not found any emulators, however, which means that to test your app you need to put it on an iPhone, which is a mission.
I am using this option as I want to create apps for all phones and I use Ruby on Rails already. If you just want to make an app for an iPhone, then invest in a Mac.
Hope this helps.
How to ssh from within a bash script?
What you need to do is to exchange the SSH keys for the user the script runs as. Have a look at this tutorial
After doing so, your scripts will run without the need for entering a password. But, for security's sake, you don't want to do this for root users!
MAX(DATE) - SQL ORACLE
Oracle 9i+ (maybe 8i too) has FIRST/LAST aggregate functions, that make computation over groups of rows according to row's rank in group. Assuming all rows as one group, you'll get what you want without subqueries:
SELECT
max(MEMBSHIP_ID)
keep (
dense_rank first
order by paym_date desc NULLS LAST
) as LATEST_MEMBER_ID
FROM user_payment
WHERE user_id=1
Biggest advantage to using ASP.Net MVC vs web forms
I have not seen ANY advantages in MVC over ASP.Net. 10 years ago Microsoft came up with UIP (User Interface Process) as the answer to MVC. It was a flop. We did a large project (4 developers, 2 designers, 1 tester) with UIP back then and it was a sheer nightmare.
Don't just jump in to bandwagon for the sake of Hype. All of the advantages listed above are already available in Asp.Net (With more great tweaks [ New features in Asp.Net 4 ] in Asp.Net 4).
If your development team or a single developer families with Asp.Net just stick to it and make beautiful products quickly to satisfy your clients (who pays for your work hours). MVC will eat up your valuable time and produce the same results as Asp.Net :-)
Check to see if cURL is installed locally?
To extend the answer above and if the case is you are using XAMPP. In the current version of the xampp you cannot locate the curl_exec in the php.ini, just try using
<?php
echo '<pre>';
var_dump(curl_version());
echo '</pre>';
?>
and save to your htdocs. Next go to your browser and paste
http://localhost/[your_filename].php
if the result looks like this
array(9) {
["version_number"]=>
int(469760)
["age"]=>
int(3)
["features"]=>
int(266141)
["ssl_version_number"]=>
int(0)
["version"]=>
string(6) "7.43.0"
["host"]=>
string(13) "i386-pc-win32"
["ssl_version"]=>
string(14) "OpenSSL/1.0.2e"
["libz_version"]=>
string(5) "1.2.8"
["protocols"]=>
array(19) {
[0]=>
string(4) "dict"
[1]=>
string(4) "file"
[2]=>
string(3) "ftp"
[3]=>
string(4) "ftps"
[4]=>
string(6) "gopher"
[5]=>
string(4) "http"
[6]=>
string(5) "https"
[7]=>
string(4) "imap"
[8]=>
string(5) "imaps"
[9]=>
string(4) "ldap"
[10]=>
string(4) "pop3"
[11]=>
string(5) "pop3s"
[12]=>
string(4) "rtsp"
[13]=>
string(3) "scp"
[14]=>
string(4) "sftp"
[15]=>
string(4) "smtp"
[16]=>
string(5) "smtps"
[17]=>
string(6) "telnet"
[18]=>
string(4) "tftp"
}
}
curl is enable
DBCC SHRINKFILE on log file not reducing size even after BACKUP LOG TO DISK
Okay, here is a solution to reduce the physical size of the transaction file, but without changing the recovery mode to simple.
Within your database, locate the file_id of the log file using the following query.
SELECT * FROM sys.database_files;
In my instance, the log file is file_id 2. Now we want to locate the virtual logs in use, and do this with the following command.
DBCC LOGINFO;
Here you can see if any virtual logs are in use by seeing if the status is 2 (in use), or 0 (free). When shrinking files, empty virtual logs are physically removed starting at the end of the file until it hits the first used status. This is why shrinking a transaction log file sometimes shrinks it part way but does not remove all free virtual logs.
If you notice a status 2's that occur after 0's, this is blocking the shrink from fully shrinking the file. To get around this do another transaction log backup, and immediately run these commands, supplying the file_id found above, and the size you would like your log file to be reduced to.
-- DBCC SHRINKFILE (file_id, LogSize_MB)
DBCC SHRINKFILE (2, 100);
DBCC LOGINFO;
This will then show the virtual log file allocation, and hopefully you'll notice that it's been reduced somewhat. Because virtual log files are not always allocated in order, you may have to backup the transaction log a couple of times and run this last query again; but I can normally shrink it down within a backup or two.
Interesting 'takes exactly 1 argument (2 given)' Python error
Yes, when you invoke e.extractAll(foo)
, Python munges that into extractAll(e, foo)
.
From http://docs.python.org/tutorial/classes.html
the special thing about methods is
that the object is passed as the first
argument of the function. In our
example, the call x.f() is exactly
equivalent to MyClass.f(x). In
general, calling a method with a list
of n arguments is equivalent to
calling the corresponding function
with an argument list that is created
by inserting the method’s object
before the first argument.
Emphasis added.
Getting the ID of the element that fired an event
I'm working with
jQuery Autocomplete
I tried looking for an event
as described above, but when the request function fires it doesn't seem to be available. I used this.element.attr("id")
to get the element's ID instead, and it seems to work fine.
How to find the process id of a running Java process on Windows? And how to kill the process alone?
This is specific to Windows.
I was facing the same issue where I have to kill one specific java program using taskkill. When I run the java program, tasklist was showing the same program with Image name set as java.exe.
But killing it using taskkill /F java.exe
will stop all other java applications other than intended one which is not required.
So I run the same java program using:
start "MyProgramName" java java-program..
Here start command will open a new window and run the java program with window's title set to MyProgramName.
Now to kill this java-program use the following taskkill command:
taskkill /fi "MyProgramName"
Your Java program will be killed only. Rest will be unaffected.
pinpointing "conditional jump or move depends on uninitialized value(s)" valgrind message
What this means is that you are trying to print out/output a value which is at least partially uninitialized. Can you narrow it down so that you know exactly what value that is? After that, trace through your code to see where it is being initialized. Chances are, you will see that it is not being fully initialized.
If you need more help, posting the relevant sections of source code might allow someone to offer more guidance.
EDIT
I see you've found the problem. Note that valgrind watches for Conditional jump or move based on unitialized variables. What that means is that it will only give out a warning if the execution of the program is altered due to the uninitialized value (ie. the program takes a different branch in an if statement, for example). Since the actual arithmetic did not involve a conditional jump or move, valgrind did not warn you of that. Instead, it propagated the "uninitialized" status to the result of the statement that used it.
It may seem counterintuitive that it does not warn you immediately, but as mark4o pointed out, it does this because uninitialized values get used in C all the time (examples: padding in structures, the realloc()
call, etc.) so those warnings would not be very useful due to the false positive frequency.
Creating an iframe with given HTML dynamically
Thanks for your great question, this has caught me out a few times. When using dataURI HTML source, I find that I have to define a complete HTML document.
See below a modified example.
var html = '<html><head></head><body>Foo</body></html>';
var iframe = document.createElement('iframe');
iframe.src = 'data:text/html;charset=utf-8,' + encodeURI(html);
take note of the html content wrapped with <html>
tags and the iframe.src
string.
The iframe element needs to be added to the DOM tree to be parsed.
document.body.appendChild(iframe);
You will not be able to inspect the iframe.contentDocument
unless you disable-web-security
on your browser.
You'll get a message
DOMException: Failed to read the 'contentDocument' property from 'HTMLIFrameElement': Blocked a frame with origin "http://localhost:7357" from accessing a cross-origin frame.
CSS transition shorthand with multiple properties?
By having the .5s delay on transitioning the opacity property, the element will be completely transparent (and thus invisible) the whole time its height is transitioning. So the only thing you will actually see is the opacity changing. So you will get the same effect as leaving the height property out of the transition :
"transition: opacity .5s .5s;"
Is that what you're wanting? If not, and you're wanting to see the height transition, you can't have an opacity of zero during the whole time that it's transitioning.
The 'Access-Control-Allow-Origin' header contains multiple values
I'm using Cors 5.1.0.0, after much headache, I discovered the issue to be duplicated
Access-Control-Allow-Origin & Access-Control-Allow-Header headers from the server
Removed config.EnableCors()
from the WebApiConfig.cs file and just set the [EnableCors("*","*","*")]
attribute on the Controller class
Check this article for more detail.
Use jQuery to change a second select list based on the first select list option
Store all #select2
's options in a variable, filter them according to the value of the chosen option in #select1
, and set them using .html()
in #select2
:
var $select1 = $( '#select1' ),
$select2 = $( '#select2' ),
$options = $select2.find( 'option' );
$select1.on('change', function() {
$select2.html($options.filter('[value="' + this.value + '"]'));
}).trigger('change');
Detect if a browser in a mobile device (iOS/Android phone/tablet) is used
Update (June 2016): I now try to support touch and mouse input on every resolution, since the device landscape is slowly blurring the lines between what things are and aren't touch devices. iPad Pros are touch-only with the resolution of a 13" laptop. Windows laptops now frequently come with touch screens.
Other similar SO answers (see other answer on this question) might have different ways to try to figure out what sort of device the user is using, but none of them are fool-proof. I encourage you to check those answers out if you absolutely need to try to determine the device.
iPhones, for one, ignore the handheld
query (Source). And I wouldn't be surprised if other smartphones do, too, for similar reasons.
The current best way that I use to detect a mobile device is to know its width and use the corresponding media query to catch it. That link there lists some popular ones. A quick Google search would yield you any others you might need, I'm sure.
For more iPhone-specific ones (such as Retina display), check out that first link I posted.
When to use RabbitMQ over Kafka?
The short answer is "message acknowledgements". RabbitMQ can be configured to require message acknowledgements. If a receiver fails the message goes back on the queue and another receiver can try again. While you can accomplish this in Kafka with your own code, it works with RabbitMQ out of the box.
In my experience, if you have an application that has requirements to query a stream of information, Kafka and KSql are your best bet. If you want a queueing system you are better off with RabbitMQ.
Cannot get to $rootScope
I've found the following "pattern" to be very useful:
MainCtrl.$inject = ['$scope', '$rootScope', '$location', 'socket', ...];
function MainCtrl (scope, rootscope, location, thesocket, ...) {
where, MainCtrl is a controller. I am uncomfortable relying on the parameter names of the Controller function doing a one-for-one mimic of the instances for fear that I might change names and muck things up. I much prefer explicitly using $inject for this purpose.
svn cleanup: sqlite: database disk image is malformed
Throughout my researches, I've found 2 viable solutions.
If you're using any type of connections, ssh, samba, mounting, disconnect/unmount and reconnect/remount. Try again, this often resolved the problem for me. After that you can do svn cleanup or just keep on working normally (depending on when the problem appeared). Rebooting my computer also fixed the problem once... yes it's dumb I know!
Some times all there is to do is to rm -rf your files (or if you're not familiar with the term, just delete your svn folder), and recheckout your svn repository once again. Please note that this does not always solve the problem and you might also have changes you don't want to lose. Which is why I use it as the second option.
Hope this helps you guys!
What to do with branch after merge
I prefer RENAME rather than DELETE
All my branches are named in the form of
Fix/fix-<somedescription>
or
Ftr/ftr-<somedescription>
or
- etc.
Using Tower as my git front end, it neatly organizes all the Ftr/
, Fix/
, Test/
etc. into folders.
Once I am done with a branch, I rename them to Done/...-<description>
.
That way they are still there (which can be handy to provide history) and I can always go back knowing what it was (feature, fix, test, etc.)
How do I print colored output with Python 3?
Since Python is interpreted and run in C, it is possible to set colors without a module.
You can define a class for colors like this:
class color:
PURPLE = '\033[1;35;48m'
CYAN = '\033[1;36;48m'
BOLD = '\033[1;37;48m'
BLUE = '\033[1;34;48m'
GREEN = '\033[1;32;48m'
YELLOW = '\033[1;33;48m'
RED = '\033[1;31;48m'
BLACK = '\033[1;30;48m'
UNDERLINE = '\033[4;37;48m'
END = '\033[1;37;0m'
When writing code, you can simply write:
print(color.BLUE + "hello friends" + color.END)
Note that the color you choose will have to be capitalized like your class definition, and that these are color choices that I personally find satisfying. For a fuller array of color choices and, indeed, background choices as well, please see: https://gist.github.com/RabaDabaDoba/145049536f815903c79944599c6f952a.
This is code for C, but can easily be adapted to Python once you realize how the code is written.
Take BLUE for example, since that is what you are wanting to display.
BLUE = '033[1;37;48m'
\033 tells Python to break and pay attention to the following formatting.
1 informs the code to be bold. (I prefer 1 to 0 because it pops more.)
34 is the actual color code. It chooses blue.
48m is the background color. 48m is the same shade as the console window, so it seems there is no background.
Brew doctor says: "Warning: /usr/local/include isn't writable."
If you are on High Sierra and experiencing this issue, follow the steps below (Note: /usr/local cannot be chown'd in High Sierra):
sudo mkdir /usr/local/include
sudo chown -R $(whoami) $(brew --prefix)/*
Then try linking with brew link. I was experiencing similar issue and none of the solutions above worked for High Sierra. Hope this helps someone.
Enabling CORS in Cloud Functions for Firebase
No CORS solutions worked for me... till now!
Not sure if anyone else ran into the same issue I did, but I set up CORS like 5 different ways from examples I found and nothing seemed to work. I set up a minimal example with Plunker to see if it was really a bug, but the example ran beautifully. I decided to check the firebase functions logs (found in the firebase console) to see if that could tell me anything. I had a couple errors in my node server code, not CORS related, that when I debugged released me of my CORS error message. I don't know why code errors unrelated to CORS returns a CORS error response, but it led me down the wrong rabbit hole for a good number of hours...
tl;dr - check your firebase function logs if no CORS solutions work and debug any errros you have
How to close an iframe within iframe itself
its kind of hacky but it works well-ish
function close_frame(){
if(!window.should_close){
window.should_close=1;
}else if(window.should_close==1){
location.reload();
//or iframe hide or whatever
}
}
<iframe src="iframe_index.php" onload="close_frame()"></iframe>
then inside the frame
$('#close_modal_main').click(function(){
window.location = 'iframe_index.php?close=1';
});
and if you want to get fancy through a
if(isset($_GET['close'])){
die;
}
at the top of your frame page to make that reload unnoticeable
so basically the first time the frame loads it doesnt hide itself but the next time it loads itll call the onload function and the parent will have a the window var causing the frame to close
Simple GUI Java calculator
Somewhere you have to keep track of what button had been pressed. When things happen, you need to store something in a variable so you can recall the information or it's gone forever.
When someone pressed one of the operator buttons, don't just let them type in another value. Save the operator symbol, then let them type in another value. You could literally just have a String operator
that gets the text of the operator button pressed. Then, when the equals button is pressed, you have to check to see which operator you stored. You could do this with an if/else if/else chain.
So, in your symbol's button press event, store the symbol text in a variable, then, in the = button press event, check to see which symbol is in the variable and act accordingly.
Alternatively, if you feel comfortable enough with enums (looks like you're just starting, so if you're not to that point yet, ignore this), you could have an enumeration of symbols that lets you check symbols easily with a switch.
Logcat not displaying my log calls
None of the other answers worked for me, but this did:
I removed my project from my workspace, then deleted anything that started with a dot (.settings, .project, etc.) from the project folder. Then I re-imported the projected. I'm missing some settings and breakpoints but at least it works.
Full-screen iframe with a height of 100%
To get a full screen iframe without a scrollbar inside the iframe use the following css. Nothing more is required
iframe{
height: 100vh;
width: 100vw
}
iframe::-webkit-scrollbar {
display: none;
}
How to Convert Boolean to String
Another way to do : json_encode( booleanValue )
echo json_encode(true); // string "true"
echo json_encode(false); // string "false"
// null !== false
echo json_encode(null); // string "null"
Why an inline "background-image" style doesn't work in Chrome 10 and Internet Explorer 8?
it is working in my google chrome browser version 11.0.696.60
I created a simple page with no other items just basic tags and no separate CSS file and got an image
this is what i setup:
<div id="placeholder" style="width: 60px; height: 60px; border: 1px solid black; background-image: url('http://www.mypicx.com/uploadimg/1312875436_05012011_2.png')"></div>
I put an id just in case there was a hidden id tag and it works
How is a JavaScript hash map implemented?
I was running into the problem where i had the json with some common keys. I wanted to group all the values having the same key. After some surfing I found hashmap package. Which is really helpful.
To group the element with the same key, I used multi(key:*, value:*, key2:*, value2:*, ...)
.
This package is somewhat similar to Java Hashmap collection, but not as powerful as Java Hashmap.
Why does Java have an "unreachable statement" compiler error?
It is certainly a good thing to complain the more stringent the compiler is the better, as far as it allows you to do what you need.
Usually the small price to pay is to comment the code out, the gain is that when you compile your code works. A general example is Haskell about which people screams until they realize that their test/debugging is main test only and short one. I personally in Java do almost no debugging while being ( in fact on purpose) not attentive.
R dates "origin" must be supplied
My R use 1970-01-01:
>as.Date(15103, origin="1970-01-01")
[1] "2011-05-09"
and this matches the calculation from
>as.numeric(as.Date(15103, origin="1970-01-01"))
Difference between Subquery and Correlated Subquery
CORRELATED SUBQUERIES: Is evaluated for each row processed by the Main query. Execute the Inner query based on the value fetched by the Outer query. Continues till all the values returned by the main query are matched. The INNER Query is driven by the OUTER Query
Ex:
SELECT empno,fname,sal,deptid FROM emp e WHERE sal=(SELECT AVG(sal) FROM emp WHERE deptid=e.deptid)
The Correlated subquery specifically computes the AVG(sal)
for each department.
SUBQUERY: Runs first,executed once,returns values to be used by the MAIN Query. The OUTER Query is driven by the INNER QUERY
GROUP_CONCAT ORDER BY
In IMPALA, not having order in the GROUP_CONCAT can be problematic, over at Coders'Co. we have some sort of a workaround for that (we need it for Rax/Impala). If you need the GROUP_CONCAT result with an ORDER BY clause in IMPALA, take a look at this blog post: http://raxdb.com/blog/sorting-by-regex/
Read XML file into XmlDocument
If your .NET version is newer than 3.0 you can try using System.Xml.Linq.XDocument
instead of XmlDocument
. It is easier to process data with XDocument
.
Splitting a string at every n-th character
Using plain java:
String s = "1234567890";
List<String> list = new Scanner(s).findAll("...").map(MatchResult::group).collect(Collectors.toList());
System.out.printf("%s%n", list);
Produces the output:
[123, 456, 789]
Note that this discards leftover characters (0 in this case).
Position absolute but relative to parent
#father {
position: relative;
}
#son1 {
position: absolute;
top: 0;
}
#son2 {
position: absolute;
bottom: 0;
}
This works because position: absolute
means something like "use top
, right
, bottom
, left
to position yourself in relation to the nearest ancestor who has position: absolute
or position: relative
."
So we make #father
have position: relative
, and the children have position: absolute
, then use top
and bottom
to position the children.
Detect if Visual C++ Redistributable for Visual Studio 2012 is installed
you can search in registry.Actually I do'nt have vs2012 but I have vs2010.
There are 3 different (but very similar) registry keys for each of the 3 platform packages. Each key has a DWORD value called “Installed” with a value of 1.
HKLM\SOFTWARE\Microsoft\VisualStudio\10.0\VC\VCRedist\x86
HKLM\SOFTWARE\Microsoft\VisualStudio\10.0\VC\VCRedist\x64
HKLM\SOFTWARE\Microsoft\VisualStudio\10.0\VC\VCRedist\ia64
You can use registry function for that......
How to commit changes to a new branch
git checkout -b your-new-branch
git add <files>
git commit -m <message>
First, checkout your new branch. Then add all the files you want to commit to staging.
Lastly, commit all the files you just added. You might want to do a git push origin your-new-branch
afterward so your changes show up on the remote.
Clone only one branch
I have done with below single git command:
git clone [url] -b [branch-name] --single-branch
Modifying location.hash without page scrolling
I have a simpler method that works for me. Basically, remember what the hash actually is in HTML. It's an anchor link to a Name tag. That's why it scrolls...the browser is attempting to scroll to an anchor link. So, give it one!
- Right under the BODY tag, put your version of this:
<a name="home"></a><a name="firstsection"></a><a name="secondsection"></a><a name="thirdsection"></a>
Name your section divs with classes instead of IDs.
In your processing code, strip off the hash mark and replace with a dot:
var trimPanel = loadhash.substring(1); //lose the hash
var dotSelect = '.' + trimPanel; //replace hash with dot
$(dotSelect).addClass("activepanel").show(); //show the div associated with the hash.
Finally, remove element.preventDefault or return: false and allow the nav to happen. The window will stay at the top, the hash will be appended to the address bar url, and the correct panel will open.
How to extract a floating number from a string
You can use the following regex to get integer and floating values from a string:
re.findall(r'[\d\.\d]+', 'hello -34 42 +34.478m 88 cricket -44.3')
['34', '42', '34.478', '88', '44.3']
Thanks
Rex
Change background color of edittext in android
Here the best way
First : make new xml
file in res
/drawable
name it rounded_edit_text
then paste this:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" android:padding="10dp">
<solid android:color="#F9966B" />
<corners
android:bottomRightRadius="15dp"
android:bottomLeftRadius="15dp"
android:topLeftRadius="15dp"
android:topRightRadius="15dp" />
</shape>
Second: in res/layout copy and past following code (code of EditText
)
<EditText
android:id="@+id/txtdoctor"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:background="@drawable/rounded_edit_text"
android:ems="10" >
<requestFocus />
</EditText>
JavaScript load a page on button click
Simple code to redirect page
<!-- html button designing and calling the event in javascript -->
<input id="btntest" type="button" value="Check"
onclick="window.location.href = 'http://www.google.com'" />
Gridview with two columns and auto resized images
another simple approach with modern built-in stuff like PercentRelativeLayout is now available for new users who hit this problem.
thanks to android team for release this item.
<android.support.percent.PercentRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
app:layout_widthPercent="50%">
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/picture"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop" />
<TextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="#55000000"
android:paddingBottom="15dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="15dp"
android:textColor="@android:color/white" />
</FrameLayout>
and for better performance you can use some stuff like picasso image loader which help you to fill whole width of every image parents.
for example in your adapter you should use this:
int width= context.getResources().getDisplayMetrics().widthPixels;
com.squareup.picasso.Picasso
.with(context)
.load("some url")
.centerCrop().resize(width/2,width/2)
.error(R.drawable.placeholder)
.placeholder(R.drawable.placeholder)
.into(item.drawableId);
now you dont need CustomImageView Class anymore.
P.S i recommend to use ImageView in place of Type Int in class Item.
hope this help..
Error: class X is public should be declared in a file named X.java
In my case (using IntelliJ) I copy and pasted and renamed the workspace, and I am still using the old path to compile the new project.
In this case this particular error will happen too, if you have the same error you can check if you have done the similar things.