Extract the filename from a path
Get-ChildItem "D:\Server\User\CUST\MEA\Data\In\Files\CORRECTED\CUST_MEAFile.csv"
|Select-Object -ExpandProperty Name
Loop through array of values with Arrow Function
In short:
someValues.forEach((element) => {
console.log(element);
});
If you care about index, then second parameter can be passed to receive the index of current element:
someValues.forEach((element, index) => {
console.log(`Current index: ${index}`);
console.log(element);
});
Refer here to know more about Array of ES6: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
How to iterate over rows in a DataFrame in Pandas
You can also do NumPy indexing for even greater speed ups. It's not really iterating but works much better than iteration for certain applications.
subset = row['c1'][0:5]
all = row['c1'][:]
You may also want to cast it to an array. These indexes/selections are supposed to act like NumPy arrays already, but I ran into issues and needed to cast
np.asarray(all)
imgs[:] = cv2.resize(imgs[:], (224,224) ) # Resize every image in an hdf5 file
How to enable LogCat/Console in Eclipse for Android?
In Eclipse, Goto Window-> Show View -> Other -> Android-> Logcat.
Logcat is nothing but a console of your Emulator or Device.
System.out.println does not work in Android. So you have to handle every thing in Logcat. More Info Look out this Documentation.
Edit 1: System.out.println is working on Logcat. If you use that the Tag will be like System.out and Message will be your message.
How to get hostname from IP (Linux)?
In order to use nslookup, host or gethostbyname() then the target's name will need to be registered with DNS or statically defined in the hosts file on the machine running your program. Yes, you could connect to the target with SSH or some other application and query it directly, but for a generic solution you'll need some sort of DNS entry for it.
Executing set of SQL queries using batch file?
Different ways:
Using SQL Server Agent (If local instance)
schedule a job in sql server agent with a new step having type as "T-SQL" then run the job.Using SQLCMD
To use SQLCMD refer http://technet.microsoft.com/en-us/library/ms162773.aspxUsing SQLPS
To use SQLPS refer http://technet.microsoft.com/en-us/library/cc280450.aspx
How do I get a value of datetime.today() in Python that is "timezone aware"?
In Python 3.2+: datetime.timezone.utc:
The standard library makes it much easier to specify UTC as the time zone:
>>> import datetime
>>> datetime.datetime.now(datetime.timezone.utc)
datetime.datetime(2020, 11, 27, 14, 34, 34, 74823, tzinfo=datetime.timezone.utc)
You can also get a datetime that includes the local time offset using astimezone:
>>> datetime.datetime.now(datetime.timezone.utc).astimezone()
datetime.datetime(2020, 11, 27, 15, 34, 34, 74823, tzinfo=datetime.timezone(datetime.timedelta(seconds=3600), 'CET'))
(In Python 3.6+, you can shorten the last line to: datetime.datetime.now().astimezone())
If you want a solution that uses only the standard library and that works in both Python 2 and Python 3, see jfs' answer.
In Python 3.9+: zoneinfo to use the IANA time zone database:
In Python 3.9, you can specify particular time zones using the standard library, using zoneinfo, like this:
>>> from zoneinfo import ZoneInfo
>>> datetime.datetime.now(ZoneInfo("America/Los_Angeles"))
datetime.datetime(2020, 11, 27, 6, 34, 34, 74823, tzinfo=zoneinfo.ZoneInfo(key='America/Los_Angeles'))
zoneinfo gets its database of time zones from the operating system, or from the first-party PyPI package tzdata if available.
How to change the order of DataFrame columns?
You could also do something like this:
df = df[['mean', '0', '1', '2', '3']]
You can get the list of columns with:
cols = list(df.columns.values)
The output will produce:
['0', '1', '2', '3', 'mean']
...which is then easy to rearrange manually before dropping it into the first function
How to read a local text file?
other example - my reader with FileReader class
<html>
<head>
<link rel="stylesheet" href="http://code.jquery.com/ui/1.11.3/themes/smoothness/jquery-ui.css">
<script src="http://code.jquery.com/jquery-1.10.2.js"></script>
<script src="http://code.jquery.com/ui/1.11.3/jquery-ui.js"></script>
</head>
<body>
<script>
function PreviewText() {
var oFReader = new FileReader();
oFReader.readAsDataURL(document.getElementById("uploadText").files[0]);
oFReader.onload = function (oFREvent) {
document.getElementById("uploadTextValue").value = oFREvent.target.result;
document.getElementById("obj").data = oFREvent.target.result;
};
};
jQuery(document).ready(function(){
$('#viewSource').click(function ()
{
var text = $('#uploadTextValue').val();
alert(text);
//here ajax
});
});
</script>
<object width="100%" height="400" data="" id="obj"></object>
<div>
<input type="hidden" id="uploadTextValue" name="uploadTextValue" value="" />
<input id="uploadText" style="width:120px" type="file" size="10" onchange="PreviewText();" />
</div>
<a href="#" id="viewSource">Source file</a>
</body>
</html>
Unable to connect to SQL Server instance remotely
I had the same issue where my firewall was configured properly, TCP/IP was enabled in SQL Server Configuration Manager but I still could not access my SQL database from outside the computer hosting it. I found the solution was SQL Server Browser was disabled by default in Services (and no option was available to enable it in SQL Server Configuration Manager).
I enabled it by Control Panel > Administrative Tools > Services then double click on SQL Server Browser. In the General tab set the startup type to Automatic using the drop down list. Then go back into SQL Server Configuration Manager and check that the SQL Server Browser is enabled. Hope this helps.
Is it possible to Turn page programmatically in UIPageViewController?
I also needed a button to navigate left on a PageViewController, one that should do exactly what you would expect from the swipe motion.
Since I had a few rules already in place inside "pageViewController:viewControllerBeforeViewController" for dealing with the natural swipe navigation, I wanted the button to re-use all that code, and simply could not afford to use specific indexes to reach pages as the previous answers did. So, I had to take an alternate solution.
Please note that the following code is for a Page View Controller that is a property inside my custom ViewController, and has its spine set to mid.
Here is the code I wrote for my Navigate Left button:
- (IBAction)btnNavigateLeft_Click:(id)sender {
// Calling the PageViewController to obtain the current left page
UIViewController *currentLeftPage = [_pageController.viewControllers objectAtIndex:0];
// Creating future pages to be displayed
NSArray *newDisplayedPages = nil;
UIViewController *newRightPage = nil;
UIViewController *newLeftPage = nil;
// Calling the delegate to obtain previous pages
// My "pageViewController:viewControllerBeforeViewController" method returns nil if there is no such page (first page of the book).
newRightPage = [self pageViewController:_pageController viewControllerBeforeViewController:currentLeftPage];
if (newRightPage) {
newLeftPage = [self pageViewController:_pageController viewControllerBeforeViewController:newRightPage];
}
if (newLeftPage) {
newDisplayedPages = [[NSArray alloc] initWithObjects:newLeftPage, newRightPage, nil];
}
// If there are two new pages to display, show them with animation.
if (newDisplayedPages) {
[_pageController setViewControllers:newDisplayedPages direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil];
}
}
You can do something very similar to make a right navigation button from here.
Minimum Hardware requirements for Android development
I find identically-specced AVDs run and load far better on my home machine (Phenom II x4 945/8GB RAM/Win7 HP 64bit) than they do on my work machine (Core2Duo/3GB RAM/Ubuntu 11.04 32bit).
As you're essentially running a virtual machine, I would personally go for nothing less than a dual core/4GB, though highly recommend a quad/8GB if you can splash out for that.
C split a char array into different variables
In addition, you can use sscanf for some very simple scenarios, for example when you know exactly how many parts the string has and what it consists of. You can also parse the arguments on the fly. Do not use it for user inputs because the function will not report conversion errors.
Example:
char text[] = "1:22:300:4444:-5";
int i1, i2, i3, i4, i5;
sscanf(text, "%d:%d:%d:%d:%d", &i1, &i2, &i3, &i4, &i5);
printf("%d, %d, %d, %d, %d", i1, i2, i3, i4, i5);
Output:
1, 22, 300, 4444, -5
For anything more advanced, strtok() and strtok_r() are your best options, as mentioned in other answers.
Terminating idle mysql connections
Manual cleanup:
You can KILL the processid.
mysql> show full processlist;
+---------+------------+-------------------+------+---------+-------+-------+-----------------------+
| Id | User | Host | db | Command | Time | State | Info |
+---------+------------+-------------------+------+---------+-------+-------+-----------------------+
| 1193777 | TestUser12 | 192.168.1.11:3775 | www | Sleep | 25946 | | NULL |
+---------+------------+-------------------+------+---------+-------+-------+-----------------------+
mysql> kill 1193777;
But:
- the php application might report errors (or the webserver, check the error logs)
- don't fix what is not broken - if you're not short on connections, just leave them be.
Automatic cleaner service ;)
Or you configure your mysql-server by setting a shorter timeout on wait_timeout and interactive_timeout
mysql> show variables like "%timeout%";
+--------------------------+-------+
| Variable_name | Value |
+--------------------------+-------+
| connect_timeout | 5 |
| delayed_insert_timeout | 300 |
| innodb_lock_wait_timeout | 50 |
| interactive_timeout | 28800 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| slave_net_timeout | 3600 |
| table_lock_wait_timeout | 50 |
| wait_timeout | 28800 |
+--------------------------+-------+
9 rows in set (0.00 sec)
Set with:
set global wait_timeout=3;
set global interactive_timeout=3;
(and also set in your configuration file, for when your server restarts)
But you're treating the symptoms instead of the underlying cause - why are the connections open? If the PHP script finished, shouldn't they close? Make sure your webserver is not using connection pooling...
How to stop an app on Heroku?
From the Heroku Web
Dashboard => Your App Name => Resources => Pencil icon=> Flip the switch => Confirm
How to create a String with carriage returns?
Do this: Step 1: Your String
String str = ";;;;;;\n" +
"Name, number, address;;;;;;\n" +
"01.01.12-16.02.12;;;;;;\n" +
";;;;;;\n" +
";;;;;;";
Step 2: Just replace all "\n" with "%n" the result looks like this
String str = ";;;;;;%n" +
"Name, number, address;;;;;;%n" +
"01.01.12-16.02.12;;;;;;%n" +
";;;;;;%n" +
";;;;;;";
Notice I've just put "%n" in place of "\n"
Step 3: Now simply call format()
str=String.format(str);
That's all you have to do.
How to find out "The most popular repositories" on Github?
Ranking by stars or forks is not working. Each promoted or created by a famous company repository is popular at the beginning. Also it is possible to have a number of them which are in trend right now (publications, marketing, events). It doesn't mean that those repositories are useful/popular.
The gitmostwanted.com project (repo at github) analyses GH Archive data in order to highlight the most interesting repositories and exclude others. Just compare the results with mentioned resources.
not None test in Python
if val is not None:
# ...
is the Pythonic idiom for testing that a variable is not set to None. This idiom has particular uses in the case of declaring keyword functions with default parameters. is tests identity in Python. Because there is one and only one instance of None present in a running Python script/program, is is the optimal test for this. As Johnsyweb points out, this is discussed in PEP 8 under "Programming Recommendations".
As for why this is preferred to
if not (val is None):
# ...
this is simply part of the Zen of Python: "Readability counts." Good Python is often close to good pseudocode.
How do I do a simple 'Find and Replace" in MsSQL?
The following query replace each and every a character with a b character.
UPDATE
YourTable
SET
Column1 = REPLACE(Column1,'a','b')
WHERE
Column1 LIKE '%a%'
This will not work on SQL server 2003.
Add more than one parameter in Twig path
Consider making your route:
_files_manage:
pattern: /files/management/{project}/{user}
defaults: { _controller: AcmeTestBundle:File:manage }
since they are required fields. It will make your url's prettier, and be a bit easier to manage.
Your Controller would then look like
public function projectAction($project, $user)
How to run Python script on terminal?
If you are working with Ubuntu, sometimes you need to run as sudo:
For Python2:
sudo python gameover.py
For Python3:
sudo python3 gameover.py
Adding an item to an associative array
For anyone that also need to add into 2d associative array, you can also use answer given above, and use the code like this
$data[$category]["test"] = $question
you can then call it (to test out the result by:
echo $data[$category]["test"];
which should print $question
Are HTTPS URLs encrypted?
You can not always count on privacy of the full URL either. For instance, as is sometimes the case on enterprise networks, supplied devices like your company PC are configured with an extra "trusted" root certificate so that your browser can quietly trust a proxy (man-in-the-middle) inspection of https traffic. This means that the full URL is exposed for inspection. This is usually saved to a log.
Furthermore, your passwords are also exposed and probably logged and this is another reason to use one time passwords or to change your passwords frequently.
Finally, the request and response content is also exposed if not otherwise encrypted.
One example of the inspection setup is described by Checkpoint here. An old style "internet café" using supplied PC's may also be set up this way.
Changing font size and direction of axes text in ggplot2
Another way to deal with overlapping labels is using guide = guide_axis(n.dodge = 2).
library(dplyr)
library(tibble)
library(ggplot2)
dt <- mtcars %>% rownames_to_column("name") %>%
dplyr::filter(cyl == 4)
# Overlapping labels
ggplot(dt, aes(x = name, y = mpg)) + geom_point()
ggplot(dt, aes(x = name, y = mpg)) + geom_point() +
scale_x_discrete(guide = guide_axis(n.dodge = 2))
SQL query return data from multiple tables
You can use the concept of multiple queries in the FROM keyword. Let me show you one example:
SELECT DISTINCT e.id,e.name,d.name,lap.lappy LAPTOP_MAKE,c_loc.cnty COUNTY
FROM (
SELECT c.id cnty,l.name
FROM county c, location l
WHERE c.id=l.county_id AND l.end_Date IS NOT NULL
) c_loc, emp e
INNER JOIN dept d ON e.deptno =d.id
LEFT JOIN
(
SELECT l.id lappy, c.name cmpy
FROM laptop l, company c
WHERE l.make = c.name
) lap ON e.cmpy_id=lap.cmpy
You can use as many tables as you want to. Use outer joins and union where ever it's necessary, even inside table subqueries.
That's a very easy method to involve as many as tables and fields.
Visual Studio 2010 always thinks project is out of date, but nothing has changed
In Visual Studio 2012 I was able to achieve the same result easier than in the accepted solution.
I changed the option in menu Tools ? Options ? Projects and Solutions ? Build and Run ? *MSBuild project build output verbosity" from Minimal to Diagnostic.
Then in the build output I found the same lines by searching for "not up to date":
Project 'blabla' is not up to date. Project item 'c:\foo\bar.xml' has 'Copy to Output Directory' attribute set to 'Copy always'.
Git status ignore line endings / identical files / windows & linux environment / dropbox / mled
Issue related to git commands on Windows operating system:
$ git add --all
warning: LF will be replaced by CRLF in ...
The file will have its original line endings in your working directory.
Resolution:
$ git config --global core.autocrlf false
$ git add --all
No any warning messages come up.
In Python, is there an elegant way to print a list in a custom format without explicit looping?
>>> from itertools import starmap
>>> lst = [1, 2, 3]
>>> print('\n'.join(starmap('{}: {}'.format, enumerate(lst))))
0: 1
1: 2
2: 3
This uses itertools.starmap, which is like map, except it *s the argument into the function. The function in this case is '{}: {}'.format.
I would prefer the comprehension of SilentGhost, but starmap is a nice function to know about.
What killed my process and why?
If the user or sysadmin did not kill the program the kernel may have. The kernel would only kill a process under exceptional circumstances such as extreme resource starvation (think mem+swap exhaustion).
How to change Bootstrap's global default font size?
Bootstrap uses the variable:
$font-size-base: 1rem; // Assumes the browser default, typically 16px
I don't recommend mucking with this, but you can. Best practice is to override the browser default base font size with:
html {
font-size: 14px;
}
Bootstrap will then take that value and use it via rems to set values for all kinds of things.
ExecutorService, how to wait for all tasks to finish
A simple alternative to this is to use threads along with join. Refer : Joining Threads
MySQL Error 1153 - Got a packet bigger than 'max_allowed_packet' bytes
Set max_allowed_packet to the same (or more) than what it was when you dumped it with mysqldump. If you can't do that, make the dump again with a smaller value.
That is, assuming you dumped it with mysqldump. If you used some other tool, you're on your own.
Printing without newline (print 'a',) prints a space, how to remove?
From PEP 3105: print As a Function in the What’s New in Python 2.6 document:
>>> from __future__ import print_function
>>> print('a', end='')
Obviously that only works with python 3.0 or higher (or 2.6+ with a from __future__ import print_function at the beginning). The print statement was removed and became the print() function by default in Python 3.0.
How to get all the AD groups for a particular user?
If you have a LDAP connection with a username and password to connect to Active Directory, here is the code I used to connect properly:
using System.DirectoryServices.AccountManagement;
// ...
// Connection information
var connectionString = "LDAP://domain.com/DC=domain,DC=com";
var connectionUsername = "your_ad_username";
var connectionPassword = "your_ad_password";
// Get groups for this user
var username = "myusername";
// Split the LDAP Uri
var uri = new Uri(connectionString);
var host = uri.Host;
var container = uri.Segments.Count() >=1 ? uri.Segments[1] : "";
// Create context to connect to AD
var princContext = new PrincipalContext(ContextType.Domain, host, container, connectionUsername, connectionPassword);
// Get User
UserPrincipal user = UserPrincipal.FindByIdentity(princContext, IdentityType.SamAccountName, username);
// Browse user's groups
foreach (GroupPrincipal group in user.GetGroups())
{
Console.Out.WriteLine(group.Name);
}
Does Index of Array Exist
It sounds very much like you're using an array to store different fields. This is definitely a code smell. I'd avoid using arrays as much as possible as they're generally not suitable (or needed) in high-level code.
Switching to a simple Dictionary may be a workable option in the short term. As would using a big property bag class. There are lots of options. The problem you have now is just a symptom of bad design, you should look at fixing the underlying problem rather than just patching the bad design so it kinda, sorta mostly works, for now.
Highcharts - redraw() vs. new Highcharts.chart
chart.series[0].setData(data,true);
The setData method itself will call the redraw method
Do fragments really need an empty constructor?
Yes they do.
You shouldn't really be overriding the constructor anyway. You should have a newInstance() static method defined and pass any parameters via arguments (bundle)
For example:
public static final MyFragment newInstance(int title, String message) {
MyFragment f = new MyFragment();
Bundle bdl = new Bundle(2);
bdl.putInt(EXTRA_TITLE, title);
bdl.putString(EXTRA_MESSAGE, message);
f.setArguments(bdl);
return f;
}
And of course grabbing the args this way:
@Override
public void onCreate(Bundle savedInstanceState) {
title = getArguments().getInt(EXTRA_TITLE);
message = getArguments().getString(EXTRA_MESSAGE);
//...
//etc
//...
}
Then you would instantiate from your fragment manager like so:
@Override
public void onCreate(Bundle savedInstanceState) {
if (savedInstanceState == null){
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.content, MyFragment.newInstance(
R.string.alert_title,
"Oh no, an error occurred!")
)
.commit();
}
}
This way if detached and re-attached the object state can be stored through the arguments. Much like bundles attached to Intents.
Reason - Extra reading
I thought I would explain why for people wondering why.
If you check: https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/app/Fragment.java
You will see the instantiate(..) method in the Fragment class calls the newInstance method:
public static Fragment instantiate(Context context, String fname, @Nullable Bundle args) {
try {
Class<?> clazz = sClassMap.get(fname);
if (clazz == null) {
// Class not found in the cache, see if it's real, and try to add it
clazz = context.getClassLoader().loadClass(fname);
if (!Fragment.class.isAssignableFrom(clazz)) {
throw new InstantiationException("Trying to instantiate a class " + fname
+ " that is not a Fragment", new ClassCastException());
}
sClassMap.put(fname, clazz);
}
Fragment f = (Fragment) clazz.getConstructor().newInstance();
if (args != null) {
args.setClassLoader(f.getClass().getClassLoader());
f.setArguments(args);
}
return f;
} catch (ClassNotFoundException e) {
throw new InstantiationException("Unable to instantiate fragment " + fname
+ ": make sure class name exists, is public, and has an"
+ " empty constructor that is public", e);
} catch (java.lang.InstantiationException e) {
throw new InstantiationException("Unable to instantiate fragment " + fname
+ ": make sure class name exists, is public, and has an"
+ " empty constructor that is public", e);
} catch (IllegalAccessException e) {
throw new InstantiationException("Unable to instantiate fragment " + fname
+ ": make sure class name exists, is public, and has an"
+ " empty constructor that is public", e);
} catch (NoSuchMethodException e) {
throw new InstantiationException("Unable to instantiate fragment " + fname
+ ": could not find Fragment constructor", e);
} catch (InvocationTargetException e) {
throw new InstantiationException("Unable to instantiate fragment " + fname
+ ": calling Fragment constructor caused an exception", e);
}
}
http://docs.oracle.com/javase/6/docs/api/java/lang/Class.html#newInstance() Explains why, upon instantiation it checks that the accessor is public and that that class loader allows access to it.
It's a pretty nasty method all in all, but it allows the FragmentManger to kill and recreate Fragments with states. (The Android subsystem does similar things with Activities).
Example Class
I get asked a lot about calling newInstance. Do not confuse this with the class method. This whole class example should show the usage.
/**
* Created by chris on 21/11/2013
*/
public class StationInfoAccessibilityFragment extends BaseFragment implements JourneyProviderListener {
public static final StationInfoAccessibilityFragment newInstance(String crsCode) {
StationInfoAccessibilityFragment fragment = new StationInfoAccessibilityFragment();
final Bundle args = new Bundle(1);
args.putString(EXTRA_CRS_CODE, crsCode);
fragment.setArguments(args);
return fragment;
}
// Views
LinearLayout mLinearLayout;
/**
* Layout Inflater
*/
private LayoutInflater mInflater;
/**
* Station Crs Code
*/
private String mCrsCode;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mCrsCode = getArguments().getString(EXTRA_CRS_CODE);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mInflater = inflater;
return inflater.inflate(R.layout.fragment_station_accessibility, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mLinearLayout = (LinearLayout)view.findViewBy(R.id.station_info_accessibility_linear);
//Do stuff
}
@Override
public void onResume() {
super.onResume();
getActivity().getSupportActionBar().setTitle(R.string.station_info_access_mobility_title);
}
// Other methods etc...
}
How do I query for all dates greater than a certain date in SQL Server?
DateTime start1 = DateTime.Parse(txtDate.Text);
SELECT *
FROM dbo.March2010 A
WHERE A.Date >= start1;
First convert TexBox into the Datetime then....use that variable into the Query
Launch Minecraft from command line - username and password as prefix
This answer is going to briefly explain how the native files are handled on the latest launcher.
As of 4/29/2017 the Minecraft launcher for Windows extracts all native files and places them info %APPDATA%\Local\Temp{random folder}. That folder is temporary and is deleted once the javaw.exe process finishes (when Minecraft is closed). The location of that temporary folder must be provided in the launch arguments as the value of
-Djava.library.path=
Also, the latest launcher (2.0.847) does not show you the launch arguments so if you need to check them yourself you can do so under the Task Manager (simply enable the Command Line tab and expand it) or by using the WMIC utility as explained here.
Hope this helps some people who are still interested in doing this in 2017.
SQL LIKE condition to check for integer?
PostgreSQL supports regular expressions matching.
So, your example would look like
SELECT * FROM books WHERE title ~ '^\d+ ?'
This will match a title starting with one or more digits and an optional space
Bootstrap trying to load map file. How to disable it? Do I need to do it?
Delete the line /*# sourceMappingURL=bootstrap.css.map */ from bootstrap.css
Can't bind to 'formGroup' since it isn't a known property of 'form'
RC5 FIX
You need to import { REACTIVE_FORM_DIRECTIVES } from '@angular/forms' in your controller and add it to directives in @Component. That will fix the problem.
After you fix that, you will probably get another error because you didn't add formControlName="name" to your input in form.
RC6/RC7/Final release FIX
To fix this error, you just need to import ReactiveFormsModule from @angular/forms in your module. Here's the example of a basic module with ReactiveFormsModule import:
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
@NgModule({
imports: [
BrowserModule,
FormsModule,
ReactiveFormsModule
],
declarations: [
AppComponent
],
bootstrap: [AppComponent]
})
export class AppModule { }
To explain further, formGroup is a selector for directive named FormGroupDirective that is a part of ReactiveFormsModule, hence the need to import it. It is used to bind an existing FormGroup to a DOM element. You can read more about it on Angular's official docs page.
Check if a folder exist in a directory and create them using C#
using System.IO;
...
Directory.CreateDirectory(@"C:\MP_Upload");
Directory.CreateDirectory does exactly what you want: It creates the directory if it does not exist yet. There's no need to do an explicit check first.
Any and all directories specified in path are created, unless they already exist or unless some part of path is invalid. The path parameter specifies a directory path, not a file path. If the directory already exists, this method does nothing.
(This also means that all directories along the path are created if needed: CreateDirectory(@"C:\a\b\c\d") suffices, even if C:\a does not exist yet.)
Let me add a word of caution about your choice of directory, though: Creating a folder directly below the system partition root C:\ is frowned upon. Consider letting the user choose a folder or creating a folder in %APPDATA% or %LOCALAPPDATA% instead (use Environment.GetFolderPath for that). The MSDN page of the Environment.SpecialFolder enumeration contains a list of special operating system folders and their purposes.
matching query does not exist Error in Django
try:
user = UniversityDetails.objects.get(email=email)
except UniversityDetails.DoesNotExist:
user = None
I also see you're storing your passwords in plaintext (a big security no-no!). Consider using the built-in auth system instead.
ActionLink htmlAttributes
The problem is that your anonymous object property data-icon has an invalid name. C# properties cannot have dashes in their names. There are two ways you can get around that:
Use an underscore instead of dash (MVC will automatically replace the underscore with a dash in the emitted HTML):
@Html.ActionLink("Edit", "edit", "markets",
new { id = 1 },
new {@class="ui-btn-right", data_icon="gear"})
Use the overload that takes in a dictionary:
@Html.ActionLink("Edit", "edit", "markets",
new { id = 1 },
new Dictionary<string, object> { { "class", "ui-btn-right" }, { "data-icon", "gear" } });
Invert "if" statement to reduce nesting
In theory, inverting if could lead to better performance if it increases branch prediction hit rate. In practice, I think it is very hard to know exactly how branch prediction will behave, especially after compiling, so I would not do it in my day-to-day development, except if I am writing assembly code.
More on branch prediction here.
Rails: How to run `rails generate scaffold` when the model already exists?
For the ones starting a rails app with existing database there is a cool gem called schema_to_scaffold to generate a scaffold script.
it outputs:
rails g scaffold users fname:string lname:string bdate:date email:string encrypted_password:string
from your schema.rb our your renamed schema.rb. Check it
Difference between "managed" and "unmanaged"
Managed Code
Managed code is what Visual Basic .NET and C# compilers create. It runs on the CLR (Common Language Runtime), which, among other things, offers services like garbage collection, run-time type checking, and reference checking. So, think of it as, "My code is managed by the CLR."
Visual Basic and C# can only produce managed code, so, if you're writing an application in one of those languages you are writing an application managed by the CLR. If you are writing an application in Visual C++ .NET you can produce managed code if you like, but it's optional.
Unmanaged Code
Unmanaged code compiles straight to machine code. So, by that definition all code compiled by traditional C/C++ compilers is 'unmanaged code'. Also, since it compiles to machine code and not an intermediate language it is non-portable.
No free memory management or anything else the CLR provides.
Since you cannot create unmanaged code with Visual Basic or C#, in Visual Studio all unmanaged code is written in C/C++.
Mixing the two
Since Visual C++ can be compiled to either managed or unmanaged code it is possible to mix the two in the same application. This blurs the line between the two and complicates the definition, but it's worth mentioning just so you know that you can still have memory leaks if, for example, you're using a third party library with some badly written unmanaged code.
Here's an example I found by googling:
#using <mscorlib.dll>
using namespace System;
#include "stdio.h"
void ManagedFunction()
{
printf("Hello, I'm managed in this section\n");
}
#pragma unmanaged
UnmanagedFunction()
{
printf("Hello, I am unmanaged through the wonder of IJW!\n");
ManagedFunction();
}
#pragma managed
int main()
{
UnmanagedFunction();
return 0;
}
Configure hibernate (using JPA) to store Y/N for type Boolean instead of 0/1
This is pure JPA without using getters/setters. As of 2013/2014 it is the best answer without using any Hibernate specific annotations, but please note this solution is JPA 2.1, and was not available when the question was first asked:
@Entity
public class Person {
@Convert(converter=BooleanToStringConverter.class)
private Boolean isAlive;
...
}
And then:
@Converter
public class BooleanToStringConverter implements AttributeConverter<Boolean, String> {
@Override
public String convertToDatabaseColumn(Boolean value) {
return (value != null && value) ? "Y" : "N";
}
@Override
public Boolean convertToEntityAttribute(String value) {
return "Y".equals(value);
}
}
Edit:
The implementation above considers anything different from character "Y", including null, as false. Is that correct? Some people here consider this incorrect, and believe that null in the database should be null in Java.
But if you return null in Java, it will give you a NullPointerException if your field is a primitive boolean. In other words, unless some of your fields actually use the class Boolean it's best to consider null as false, and use the above implementation. Then Hibernate will not to emit any exceptions regardless of the contents of the database.
And if you do want to accept null and emit exceptions if the contents of the database are not strictly correct, then I guess you should not accept any characters apart from "Y", "N" and null. Make it consistent, and don't accept any variations like "y", "n", "0" and "1", which will only make your life harder later. This is a more strict implementation:
@Override
public String convertToDatabaseColumn(Boolean value) {
if (value == null) return null;
else return value ? "Y" : "N";
}
@Override
public Boolean convertToEntityAttribute(String value) {
if (value == null) return null;
else if (value.equals("Y")) return true;
else if (value.equals("N")) return false;
else throw new IllegalStateException("Invalid boolean character: " + value);
}
And yet another option, if you want to allow for null in Java but not in the database:
@Override
public String convertToDatabaseColumn(Boolean value) {
if (value == null) return "-";
else return value ? "Y" : "N";
}
@Override
public Boolean convertToEntityAttribute(String value) {
if (value.equals("-") return null;
else if (value.equals("Y")) return true;
else if (value.equals("N")) return false;
else throw new IllegalStateException("Invalid boolean character: " + value);
}
What is the advantage of using heredoc in PHP?
Heredoc's are a great alternative to quoted strings because of increased readability and maintainability. You don't have to escape quotes and (good) IDEs or text editors will use the proper syntax highlighting.
A very common example: echoing out HTML from within PHP:
$html = <<<HTML
<div class='something'>
<ul class='mylist'>
<li>$something</li>
<li>$whatever</li>
<li>$testing123</li>
</ul>
</div>
HTML;
// Sometime later
echo $html;
It is easy to read and easy to maintain.
The alternative is echoing quoted strings, which end up containing escaped quotes and IDEs aren't going to highlight the syntax for that language, which leads to poor readability and more difficulty in maintenance.
Updated answer for Your Common Sense
Of course you wouldn't want to see an SQL query highlighted as HTML. To use other languages, simply change the language in the syntax:
$sql = <<<SQL
SELECT * FROM table
SQL;
jQuery add image inside of div tag
$("#theDiv").append("<img id='theImg' src='theImg.png'/>");
You need to read the documentation here.
Pass multiple parameters to rest API - Spring
(1) Is it possible to pass a JSON object to the url like in Ex.2?
No, because http://localhost:8080/api/v1/mno/objectKey/{"id":1, "name":"Saif"} is not a valid URL.
If you want to do it the RESTful way, use http://localhost:8080/api/v1/mno/objectKey/1/Saif, and defined your method like this:
@RequestMapping(path = "/mno/objectKey/{id}/{name}", method = RequestMethod.GET)
public Book getBook(@PathVariable int id, @PathVariable String name) {
// code here
}
(2) How can we pass and parse the parameters in Ex.1?
Just add two request parameters, and give the correct path.
@RequestMapping(path = "/mno/objectKey", method = RequestMethod.GET)
public Book getBook(@RequestParam int id, @RequestParam String name) {
// code here
}
UPDATE (from comment)
What if we have a complicated parameter structure ?
"A": [ { "B": 37181, "timestamp": 1160100436, "categories": [ { "categoryID": 2653, "timestamp": 1158555774 }, { "categoryID": 4453, "timestamp": 1158555774 } ] } ]
Send that as a POST with the JSON data in the request body, not in the URL, and specify a content type of application/json.
@RequestMapping(path = "/mno/objectKey", method = RequestMethod.POST, consumes = "application/json")
public Book getBook(@RequestBody ObjectKey objectKey) {
// code here
}
How to find specified name and its value in JSON-string from Java?
Gson allows for one of the simplest possible solutions. Compared to similar APIs like Jackson or svenson, Gson by default doesn't even need the unused JSON elements to have bindings available in the Java structure. Specific to the question asked, here's a working solution.
import com.google.gson.Gson;
public class Foo
{
static String jsonInput =
"{" +
"\"name\":\"John\"," +
"\"age\":\"20\"," +
"\"address\":\"some address\"," +
"\"someobject\":" +
"{" +
"\"field\":\"value\"" +
"}" +
"}";
String age;
public static void main(String[] args) throws Exception
{
Gson gson = new Gson();
Foo thing = gson.fromJson(jsonInput, Foo.class);
if (thing.age != null)
{
System.out.println("age is " + thing.age);
}
else
{
System.out.println("age element not present or value is null");
}
}
}
Using client certificate in Curl command
This is how I did it:
curl -v \
--key ./admin-key.pem \
--cert ./admin.pem \
https://xxxx/api/v1/
Set QLineEdit to accept only numbers
The best is QSpinBox.
And for a double value use QDoubleSpinBox.
QSpinBox myInt;
myInt.setMinimum(-5);
myInt.setMaximum(5);
myInt.setSingleStep(1);// Will increment the current value with 1 (if you use up arrow key) (if you use down arrow key => -1)
myInt.setValue(2);// Default/begining value
myInt.value();// Get the current value
//connect(&myInt, SIGNAL(valueChanged(int)), this, SLOT(myValueChanged(int)));
Convert PDF to image with high resolution
normally I extract the embedded image with 'pdfimages' at the native resolution, then use ImageMagick's convert to the needed format:
$ pdfimages -list fileName.pdf
$ pdfimages fileName.pdf fileName # save in .ppm format
$ convert fileName-000.ppm fileName-000.png
this generate the best and smallest result file.
Note: For lossy JPG embedded images, you had to use -j:
$ pdfimages -j fileName.pdf fileName # save in .jpg format
With recent poppler you can use -all that save lossy as jpg and lossless as png
On little provided Win platform you had to download a recent (0.37 2015) 'poppler-util' binary from: http://blog.alivate.com.au/poppler-windows/
split python source code into multiple files?
I am researching module usage in python just now and thought I would answer the question Markus asks in the comments above ("How to import variables when they are embedded in modules?") from two perspectives:
- variable/function, and
- class property/method.
Here is how I would rewrite the main program f1.py to demonstrate variable reuse for Markus:
import f2
myStorage = f2.useMyVars(0) # initialze class and properties
for i in range(0,10):
print "Hello, "
f2.print_world()
myStorage.setMyVar(i)
f2.inc_gMyVar()
print "Display class property myVar:", myStorage.getMyVar()
print "Display global variable gMyVar:", f2.get_gMyVar()
Here is how I would rewrite the reusable module f2.py:
# Module: f2.py
# Example 1: functions to store and retrieve global variables
gMyVar = 0
def print_world():
print "World!"
def get_gMyVar():
return gMyVar # no need for global statement
def inc_gMyVar():
global gMyVar
gMyVar += 1
# Example 2: class methods to store and retrieve properties
class useMyVars(object):
def __init__(self, myVar):
self.myVar = myVar
def getMyVar(self):
return self.myVar
def setMyVar(self, myVar):
self.myVar = myVar
def print_helloWorld(self):
print "Hello, World!"
When f1.py is executed here is what the output would look like:
%run "f1.py"
Hello,
World!
Hello,
World!
Hello,
World!
Hello,
World!
Hello,
World!
Hello,
World!
Hello,
World!
Hello,
World!
Hello,
World!
Hello,
World!
Display class property myVar: 9
Display global variable gMyVar: 10
I think the point to Markus would be:
- To reuse a module's code more than once, put your module's code into functions or classes,
- To reuse variables stored as properties in modules, initialize properties within a class and add "getter" and "setter" methods so variables do not have to be copied into the main program,
- To reuse variables stored in modules, initialize the variables and use getter and setter functions. The setter functions would declare the variables as global.
C# Call a method in a new thread
If you actually start a new thread, that thread will terminate when the method finishes:
Thread thread = new Thread(SecondFoo);
thread.Start();
Now SecondFoo will be called in the new thread, and the thread will terminate when it completes.
Did you actually mean that you wanted the thread to terminate when the method in the calling thread completes?
EDIT: Note that starting a thread is a reasonably expensive operation. Do you definitely need a brand new thread rather than using a threadpool thread? Consider using ThreadPool.QueueUserWorkItem or (preferrably, if you're using .NET 4) TaskFactory.StartNew.
Test for non-zero length string in Bash: [ -n "$var" ] or [ "$var" ]
Use case/esac to test:
case "$var" in
"") echo "zero length";;
esac
How to find a number in a string using JavaScript?
var str = "you can enter maximum 500 choices";
str.replace(/[^0-9]/g, "");
console.log(str); // "500"
How to change lowercase chars to uppercase using the 'keyup' event?
Let say your html code is :
<input type="text" id="txtMyText" />
then the jquery should be :
$('#txtMyText').keyup(function() {
this.value = this.value.toUpperCase();
});
jquery - How to determine if a div changes its height or any css attribute?
Another simple example.
For this sample we can use 100x100 DIV-box:
<div id="box" style="width: 100px; height: 100px; border: solid 1px red;">
// Red box contents here...
</div>
And small jQuery trick:
<script type="text/javascript">
jQuery("#box").bind("resize", function() {
alert("Box was resized from 100x100 to 200x200");
});
jQuery("#box").width(200).height(200).trigger("resize");
</script>
Steps:
- We created DIV block element for resizing operatios
- Add simple JavaScript code with:
- jQuery bind
- jQuery resizer with trigger action "resize" - trigger is most important thing in my example
- After resize you can check the browser alert information
That's all. ;-)
Is it possible to access to google translate api for free?
Yes, you can use GT for free. See the post with explanation. And look at repo on GitHub.
UPD 19.03.2019 Here is a version for browser on GitHub.
Find duplicate records in MongoDB
db.getCollection('orders').aggregate([
{$group: {
_id: {name: "$name"},
uniqueIds: {$addToSet: "$_id"},
count: {$sum: 1}
}
},
{$match: {
count: {"$gt": 1}
}
}
])
First Group Query the group according to the fields.
Then we check the unique Id and count it, If count is greater then 1 then the field is duplicate in the entire collection so that thing is to be handle by $match query.
How to check whether an object is a date?
I have been using a much simpler way but am not sure if this is only available in ES6 or not.
let a = {name: "a", age: 1, date: new Date("1/2/2017"), arr: [], obj: {} };
console.log(a.name.constructor.name); // "String"
console.log(a.age.constructor.name); // "Number"
console.log(a.date.constructor.name); // "Date"
console.log(a.arr.constructor.name); // "Array"
console.log(a.obj.constructor.name); // "Object"
However, this will not work on null or undefined since they have no constructor.
What are the lesser known but useful data structures?
Pairing heaps are a type of heap data structure with relatively simple implementation and excellent practical amortized performance.
Reordering Chart Data Series
Excel 2010 - if you're looking to reorder the series on a pivot chart:
- go to your underlying pivot table
- right-click on one of the Column Labels for the series you're looking to adjust (Note: you need to click on one of the series headings (i.e. 'Saturday' or 'Sunday' in the example shown below) not the 'Column Labels' text itself)
- in the pop-up menu, hover over 'Move' and then select an option from the resulting sub-menu to reposition the series variable.
- your pivot chart will update itself accordingly
How to check if object has any properties in JavaScript?
You can use the following:
Double bang !! property lookup
var a = !![]; // true
var a = !!null; // false
hasOwnProperty This is something that I used to use:
var myObject = {
name: 'John',
address: null
};
if (myObject.hasOwnProperty('address')) { // true
// do something if it exists.
}
However, JavaScript decided not to protect the method’s name, so it could be tampered with.
var myObject = {
hasOwnProperty: 'I will populate it myself!'
};
prop in myObject
var myObject = {
name: 'John',
address: null,
developer: false
};
'developer' in myObject; // true, remember it's looking for exists, not value.
typeof
if (typeof myObject.name !== 'undefined') {
// do something
}
However, it doesn't check for null.
I think this is the best way.
in operator
var myObject = {
name: 'John',
address: null
};
if('name' in myObject) {
console.log("Name exists in myObject");
}else{
console.log("Name does not exist in myObject");
}
result:
Name exists in myObject
Here is a link that goes into more detail on the in operator: Determining if an object property exists
How to iterate std::set?
Just use the * before it:
set<unsigned long>::iterator it;
for (it = myset.begin(); it != myset.end(); ++it) {
cout << *it;
}
This dereferences it and allows you to access the element the iterator is currently on.
How to change JDK version for an Eclipse project
As I was facing this issue minutes ago, in case you are trying to open an existing project in an environment with a newer JDK, make sure you pdate the JDK version in Project Properties -> Project Facets -> Java.
How to correctly display .csv files within Excel 2013?
You can choose which separator you want in Excel 2013 Go to DATA -> Text To Columns -> Choose delimited -> then choose your separator "Tab, Semicolon, Comma, Space or other" and you will see changes immediately in the "data preview" then click FInish
Once you have the format that you wanted, you simply save the document and it will be permanent.
Accessing nested JavaScript objects and arrays by string path
Here I offer more ways, which seem faster in many respects:
Option 1: Split string on . or [ or ] or ' or ", reverse it, skip empty items.
function getValue(path, origin) {
if (origin === void 0 || origin === null) origin = self ? self : this;
if (typeof path !== 'string') path = '' + path;
var parts = path.split(/\[|\]|\.|'|"/g).reverse(), name; // (why reverse? because it's usually faster to pop off the end of an array)
while (parts.length) { name=parts.pop(); if (name) origin=origin[name]; }
return origin;
}
Option 2 (fastest of all, except eval): Low level character scan (no regex/split/etc, just a quick char scan).
Note: This one does not support quotes for indexes.
function getValue(path, origin) {
if (origin === void 0 || origin === null) origin = self ? self : this;
if (typeof path !== 'string') path = '' + path;
var c = '', pc, i = 0, n = path.length, name = '';
if (n) while (i<=n) ((c = path[i++]) == '.' || c == '[' || c == ']' || c == void 0) ? (name?(origin = origin[name], name = ''):(pc=='.'||pc=='['||pc==']'&&c==']'?i=n+2:void 0),pc=c) : name += c;
if (i==n+2) throw "Invalid path: "+path;
return origin;
} // (around 1,000,000+/- ops/sec)
Option 3: (new: option 2 expanded to support quotes - a bit slower, but still fast)
function getValue(path, origin) {
if (origin === void 0 || origin === null) origin = self ? self : this;
if (typeof path !== 'string') path = '' + path;
var c, pc, i = 0, n = path.length, name = '', q;
while (i<=n)
((c = path[i++]) == '.' || c == '[' || c == ']' || c == "'" || c == '"' || c == void 0) ? (c==q&&path[i]==']'?q='':q?name+=c:name?(origin?origin=origin[name]:i=n+2,name='') : (pc=='['&&(c=='"'||c=="'")?q=c:pc=='.'||pc=='['||pc==']'&&c==']'||pc=='"'||pc=="'"?i=n+2:void 0), pc=c) : name += c;
if (i==n+2 || name) throw "Invalid path: "+path;
return origin;
}
JSPerf: http://jsperf.com/ways-to-dereference-a-delimited-property-string/3
"eval(...)" is still king though (performance wise that is). If you have property paths directly under your control, there shouldn't be any issues with using 'eval' (especially if speed is desired). If pulling property paths "over the wire" (on the line!? lol :P), then yes, use something else to be safe. Only an idiot would say to never use "eval" at all, as there ARE good reasons when to use it. Also, "It is used in Doug Crockford's JSON parser." If the input is safe, then no problems at all. Use the right tool for the right job, that's it.
How to add icon to mat-icon-button
Add to app.module.ts
import {MatIconModule} from '@angular/material/icon';
& link in your global index.html.
How to get the cell value by column name not by index in GridView in asp.net
A little bug with indexcolumn in alexander's answer: We need to take care of "not found" column:
int GetColumnIndexByName(GridViewRow row, string columnName)
{
int columnIndex = 0;
int foundIndex=-1;
foreach (DataControlFieldCell cell in row.Cells)
{
if (cell.ContainingField is BoundField)
{
if (((BoundField)cell.ContainingField).DataField.Equals(columnName))
{
foundIndex=columnIndex;
break;
}
}
columnIndex++; // keep adding 1 while we don't have the correct name
}
return foundIndex;
}
and
protected void GridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
int index = GetColumnIndexByName(e.Row, "myDataField");
if( index>0)
{
string columnValue = e.Row.Cells[index].Text;
}
}
}
Save child objects automatically using JPA Hibernate
Following program describe how bidirectional relation work in hibernate.
When parent will save its list of child object will be auto save.
On Parent side:
@Entity
@Table(name="clients")
public class Clients implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@OneToMany(mappedBy="clients", cascade=CascadeType.ALL)
List<SmsNumbers> smsNumbers;
}
And put the following annotation on the child side:
@Entity
@Table(name="smsnumbers")
public class SmsNumbers implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
int id;
String number;
String status;
Date reg_date;
@ManyToOne
@JoinColumn(name = "client_id")
private Clients clients;
// and getter setter.
}
Main class:
public static void main(String arr[])
{
Session session = HibernateUtil.openSession();
//getting transaction object from session object
session.beginTransaction();
Clients cl=new Clients("Murali", "1010101010");
SmsNumbers sms1=new SmsNumbers("99999", "Active", cl);
SmsNumbers sms2=new SmsNumbers("88888", "InActive", cl);
SmsNumbers sms3=new SmsNumbers("77777", "Active", cl);
List<SmsNumbers> lstSmsNumbers=new ArrayList<SmsNumbers>();
lstSmsNumbers.add(sms1);
lstSmsNumbers.add(sms2);
lstSmsNumbers.add(sms3);
cl.setSmsNumbers(lstSmsNumbers);
session.saveOrUpdate(cl);
session.getTransaction().commit();
session.close();
}
Converting a char to uppercase
Instead of using existing utilities, you may try below conversion using boolean operation:
To upper case:
char upperChar = 'l' & 0x5f
To lower case:
char lowerChar = 'L' ^ 0x20
How it works:
Binary, hex and decimal table:
------------------------------------------
| Binary | Hexadecimal | Decimal |
-----------------------------------------
| 1011111 | 0x5f | 95 |
------------------------------------------
| 100000 | 0x20 | 32 |
------------------------------------------
Let's take an example of small l to L conversion:
The binary AND operation: (l & 0x5f)
l character has ASCII 108 and 01101100 is binary represenation.
1101100
& 1011111
-----------
1001100 = 76 in decimal which is **ASCII** code of L
Similarly the L to l conversion:
The binary XOR operation: (L ^ 0x20)
1001100
^ 0100000
-----------
1101100 = 108 in decimal which is **ASCII** code of l
What is the $$hashKey added to my JSON.stringify result
If you don't want to add id's to your data, you could track by the index in the array, which will cause the items to be keyed by their position in the array instead of their value.
Like this:
var myArray = [1,1,1,1,1];
<li ng-repeat="item in myArray track by $index">
Creating a LinkedList class from scratch
What you have coded is not a LinkedList, at least not one that I recognize. For this assignment, you want to create two classes:
LinkNode
LinkedList
A LinkNode has one member field for the data it contains, and a LinkNode reference to the next LinkNode in the LinkedList. Yes, it's a self referential data structure. A LinkedList just has a special LinkNode reference that refers to the first item in the list.
When you add an item in the LinkedList, you traverse all the LinkNode's until you reach the last one. This LinkNode's next should be null. You then construct a new LinkNode here, set it's value, and add it to the LinkedList.
public class LinkNode {
String data;
LinkNode next;
public LinkNode(String item) {
data = item;
}
}
public class LinkedList {
LinkNode head;
public LinkedList(String item) {
head = new LinkNode(item);
}
public void add(String item) {
//pseudo code: while next isn't null, walk the list
//once you reach the end, create a new LinkNode and add the item to it. Then
//set the last LinkNode's next to this new LinkNode
}
}
Increasing the timeout value in a WCF service
Are you referring to the server side or the client side?
For a client, you would want to adjust the sendTimeout attribute of a binding element. For a service, you would want to adjust the receiveTimeout attribute of a binding elemnent.
<system.serviceModel>
<bindings>
<netTcpBinding>
<binding name="longTimeoutBinding"
receiveTimeout="00:10:00" sendTimeout="00:10:00">
<security mode="None"/>
</binding>
</netTcpBinding>
</bindings>
<services>
<service name="longTimeoutService"
behaviorConfiguration="longTimeoutBehavior">
<endpoint address="net.tcp://localhost/longtimeout/"
binding="netTcpBinding" bindingConfiguration="longTimeoutBinding" />
</service>
....
Of course, you have to map your desired endpoint to that particular binding.
UIView's frame, bounds, center, origin, when to use what?
The properties center, bounds and frame are interlocked: changing one will update the others, so use them however you want. For example, instead of modifying the x/y params of frame to recenter a view, just update the center property.
How to generate a GUID in Oracle?
sys_guid() is a poor option, as other answers have mentioned. One way to generate UUIDs and avoid sequential values is to generate random hex strings yourself:
select regexp_replace(
to_char(
DBMS_RANDOM.value(0, power(2, 128)-1),
'FM0xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'),
'([a-f0-9]{8})([a-f0-9]{4})([a-f0-9]{4})([a-f0-9]{4})([a-f0-9]{12})',
'\1-\2-\3-\4-\5') from DUAL;
Creating all possible k combinations of n items in C++
The basic idea of this solution is to mimic the way you enumerate all the combinations without repetitions by hand in high school. Let com be List[int] of length k and nums be List[int] the given n items, where n >= k. The idea is as follows:
for x[0] in nums[0,...,n-1]
for x[1] in nums[idx_of_x[0] + 1,..,n-1]
for x[2] in nums [idx_of_x[1] + 1,...,n-1]
..........
for x[k-1] in nums [idx_of_x[k-2]+1, ..,n-1]
Obviously, k and n are variable arguments, which makes it impossible to write explicit multiple nested for-loops. This is where the recursion comes to rescue the issue.
Statement len(com) + len(nums[i:]) >= k checks whether the remaining unvisited forward list of items can provide k iitems. By forward, I mean you should not walk the nums backward for avoiding the repeated combination, which consists of same set of items but in different order. Put it in another way, in these different orders, we can choose the order these items appear in the list by scaning the list forward. More importantly, this test clause internally prunes the recursion tree such that it only contains n choose k recursive calls. Hence, the running time is O(n choose k).
from typing import List
class Solution:
def combine(self, n: int, k: int) -> List[List[int]]:
assert 1 <= n <= 20
assert 1 <= k <= n
com_sets = []
self._combine_recurse(k, list(range(1, n+1)), [], com_sets)
return com_sets
def _combine_recurse(self, k: int, nums: List[int], com: List[int], com_set: List[List[int]]):
"""
O(C_n^k)
"""
if len(com) < k:
for i in range(len(nums)):
# Once again, don't com.append() since com should not be global!
if len(com) + len(nums[i:]) >= k:
self._combine_recurse(k, nums[i+1:], com + [nums[i]], com_set)
else:
if len(com) == k:
com_set.append(com)
print(com)
sol = Solution()
sol.combine(5, 3)
[1, 2, 3]
[1, 2, 4]
[1, 2, 5]
[1, 3, 4]
[1, 3, 5]
[1, 4, 5]
[2, 3, 4]
[2, 3, 5]
[2, 4, 5]
[3, 4, 5]
How to get the Facebook user id using the access token
in FacebookSDK v2.1 (I can't check older version). We have
NSString *currentUserFBID = [FBSession activeSession].accessTokenData.userID;
However according to the comment in FacebookSDK
@discussion This may not be populated for login behaviours such as the iOS system account.
So may be you should check if it is available, and then whether use it, or call the request to get the user id
PHP Parse error: syntax error, unexpected T_PUBLIC
You can remove public keyword from your functions, because, you have to define a class in order to declare public, private or protected function
Linq select objects in list where exists IN (A,B,C)
Your status-codes are also a collection, so use Contains:
var allowedStatus = new[]{ "A", "B", "C" };
var filteredOrders = orders.Order.Where(o => allowedStatus.Contains(o.StatusCode));
or in query syntax:
var filteredOrders = from order in orders.Order
where allowedStatus.Contains(order.StatusCode)
select order;
Getting String value from enum in Java
I believe enum have a .name() in its API, pretty simple to use like this example:
private int security;
public String security(){ return Security.values()[security].name(); }
public void setSecurity(int security){ this.security = security; }
private enum Security {
low,
high
}
With this you can simply call
yourObject.security()
and it returns high/low as String, in this example
What does "Could not find or load main class" mean?
I also faced similar errors while testing a Java MongoDB JDBC connection. I think it's good to summarize my final solution in short so that in the future anybody can directly look into the two commands and are good to proceed further.
Assume you are in the directory where your Java file and external dependencies (JAR files) exist.
Compile:
javac -cp mongo-java-driver-3.4.1.jar JavaMongoDBConnection.java
- -cp - classpath argument; pass all the dependent JAR files one by one
- *.java - This is the Java class file which has main method. sdsd
Run:
java -cp mongo-java-driver-3.4.1.jar: JavaMongoDBConnection
- Please do observe the colon (Unix) / comma (Windows) after all the dependency JAR files end
- At the end, observe the main class name without any extension (no .class or .java)
how to set ulimit / file descriptor on docker container the image tag is phusion/baseimage-docker
For boot2docker, we can set it on /var/lib/boot2docker/profile, for instance:
ulimit -n 2018
Be warned not to set this limit too high as it will slow down apt-get! See bug #1332440. I had it with debian jessie.
Override standard close (X) button in a Windows Form
This is a pretty commonly asked question. One good answer is here:
VB.NET overload default functionality when user clicks the X (Close Program)
If you don't feel comfortable putting your code in the Form_Closing event, the only other option I am aware of is a "hack" that I've used once or twice. It should not be necessary to resort to this hack, but here it is:
Don't use the normal close button. Instead, create your form so that it has no ControlBox. You can do this by setting ControlBox = false on the form, in which case, you will still have the normal bar across the top of the form, or you can set the form's FormBorderStyle to "None. If you go this second route, there will be no bar across the top, or any other visible border, so you'll have to simulate those either by drawing on the form, or by artistic use of Panel controls.
Then you can add a standard button and make it look like a close button, and put your clean-up code in there. At the end of the button event, just call this.Close() (C#) or Me.Close() (VB)
Specify multiple attribute selectors in CSS
Simple input[name=Sex][value=M] would do pretty nice. And it's actually well-described in the standard doc:
Multiple attribute selectors can be used to refer to several attributes of an element, or even several times to the same attribute.
Here, the selector matches all SPAN elements whose "hello" attribute has exactly the value "Cleveland" and whose "goodbye" attribute has exactly the value "Columbus":
span[hello="Cleveland"][goodbye="Columbus"] { color: blue; }
As a side note, using quotation marks around an attribute value is required only if this value is not a valid identifier.
ALTER TABLE on dependent column
If your constraint is on a user type, then don't forget to see if there is a Default Constraint, usually something like DF__TableName__ColumnName__6BAEFA67, if so then you will need to drop the Default Constraint, like this:
ALTER TABLE TableName DROP CONSTRAINT [DF__TableName__ColumnName__6BAEFA67]
For more info see the comments by the brilliant Aaron Bertrand on this answer.
What possibilities can cause "Service Unavailable 503" error?
We recently encountered this error, root cause turned out to be an expired SSL cert on the IIS server. The Load Balancer (infront of our web tier) found the SSL expired, and instead of handling the HTTP traffic over to one of the IIS servers, started showing this error. So basically IIS unable to server requests, for a totally different reason :)
PHP function to get the subdomain of a URL
PHP 7.0: Using the explode function and create a list of all the results.
list($subdomain,$host) = explode('.', $_SERVER["SERVER_NAME"]);
Example: sub.domain.com
echo $subdomain;
Result: sub
echo $host;
Result: domain
Disabling Strict Standards in PHP 5.4
Heads up, you might need to restart LAMP, Apache or whatever your using to make this take affect. Racked our brains for a while on this one, seemed to make no affect until services were restarted, presumably because the website was caching.
javascript toISOString() ignores timezone offset
My solution without using moment is to convert it to a timestamp, add the timezone offset, then convert back to a date object, and then run the toISOString()
var date = new Date(); // Or the date you'd like converted.
var isoDateTime = new Date(date.getTime() - (date.getTimezoneOffset() * 60000)).toISOString();
How do I watch a file for changes?
Well, since you are using Python, you can just open a file and keep reading lines from it.
f = open('file.log')
If the line read is not empty, you process it.
line = f.readline()
if line:
// Do what you want with the line
You may be missing that it is ok to keep calling readline at the EOF. It will just keep returning an empty string in this case. And when something is appended to the log file, the reading will continue from where it stopped, as you need.
If you are looking for a solution that uses events, or a particular library, please specify this in your question. Otherwise, I think this solution is just fine.
Beamer: How to show images as step-by-step images
This is what I did:
\begin{frame}{series of images}
\begin{center}
\begin{overprint}
\only<2>{\includegraphics[scale=0.40]{image1.pdf}}
\hspace{-0.17em}\only<3>{\includegraphics[scale=0.40]{image2.pdf}}
\hspace{-0.34em}\only<4>{\includegraphics[scale=0.40]{image3.pdf}}
\hspace{-0.17em}\only<5>{\includegraphics[scale=0.40]{image4.pdf}}
\only<2-5>{\mbox{\structure{Figure:} something}}
\end{overprint}
\end{center}
\end{frame}
How do I remove files saying "old mode 100755 new mode 100644" from unstaged changes in Git?
This usually happens when the repo is cloned between Windows and Linux/Unix machines.
Just tell git to ignore filemode change. Here are several ways to do so:
Config ONLY for current repo:
git config core.filemode falseConfig globally:
git config --global core.filemode falseAdd in ~/.gitconfig:
[core] filemode = false
Just select one of them.
Getting "Cannot call a class as a function" in my React Project
For me, it was ComponentName.prototype instead of ComponentName.propTypes.
auto suggested by Phpstorm IDE. Hope it will help someone.
PHP Deprecated: Methods with the same name
As mentioned in the error, the official manual and the comments:
Replace
public function TSStatus($host, $queryPort)
with
public function __construct($host, $queryPort)
printing all contents of array in C#
There are many ways to do it, the other answers are good, here's an alternative:
Console.WriteLine(string.Join("\n", myArrayOfObjects));
HTML5 Local storage vs. Session storage
Few other points which might be helpful to understand differences between local and session storage
Both local storage and session storage are scoped to document origin, so
https://mydomain.com/
http://mydomain.com/
https://mydomain.com:8080/All of the above URL's will not share the same storage. (Notice path of the web page does not affect the web storage)
Session storage is different even for the document with same origin policy open in different tabs, so same web page open in two different tabs cannot share the same session storage.
Both local and session storage are also scoped by browser vendors. So storage data saved by IE cannot be read by Chrome or FF.
Hope this helps.
How do you implement a class in C?
you can take a look at GOBject. it's an OS library that give you a verbose way to do an object.
assign multiple variables to the same value in Javascript
Nothing stops you from doing
moveUp = moveDown = moveLeft = moveRight = mouseDown = touchDown = false;
Check this example
var a, b, c;_x000D_
a = b = c = 10;_x000D_
console.log(a + b + c)git command to move a folder inside another
I had similar problem, but in folder which I wanted to move I had files which I was not tracking.
let's say I had files
a/file1
a/untracked1
b/file2
b/untracked2
And I wanted to move only tracked files to subfolder subdir, so the goal was:
subdir/a/file1
subdir/a/untracked1
subdir/b/file2
subdir/b/untracked2
what I had done was:
- I created new folder and moved all files that I was interested in moving:
mkdir tmpdir && mv a b tmpdir - checked out old files
git checkout a b - created new dir and moved clean folders (without untracked files) to new subdir:
mkdir subdir && mv a b subdir - added all files from subdir (so Git could add only tracked previously files - it was somekind of
git add --updatewith directory change trick):git add subdir(normally this would add even untracked files - this would require creating.gitignorefile) git statusshows now only moved files- moved rest of files from tmpdir to subdir:
mv tmpdir/* subdir git statuslooks like we executedgit mv:)
Express-js wildcard routing to cover everything under and including a path
The connect router has now been removed (https://github.com/senchalabs/connect/issues/262), the author stating that you should use a framework on top of connect (like Express) for routing.
Express currently treats app.get("/foo*") as app.get(/\/foo(.*)/), removing the need for two separate routes. This is in contrast to the previous answer (referring to the now removed connect router) which stated that "* in a path is replaced with .+".
Update: Express now uses the "path-to-regexp" module (since Express 4.0.0) which maintains the same behavior in the version currently referenced. It's unclear to me whether the latest version of that module keeps the behavior, but for now this answer stands.
Ignoring a class property in Entity Framework 4.1 Code First
You can use the NotMapped attribute data annotation to instruct Code-First to exclude a particular property
public class Customer
{
public int CustomerID { set; get; }
public string FirstName { set; get; }
public string LastName{ set; get; }
[NotMapped]
public int Age { set; get; }
}
[NotMapped] attribute is included in the System.ComponentModel.DataAnnotations namespace.
You can alternatively do this with Fluent API overriding OnModelCreating function in your DBContext class:
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Customer>().Ignore(t => t.LastName);
base.OnModelCreating(modelBuilder);
}
http://msdn.microsoft.com/en-us/library/hh295847(v=vs.103).aspx
The version I checked is EF 4.3, which is the latest stable version available when you use NuGet.
Edit : SEP 2017
Asp.NET Core(2.0)
Data annotation
If you are using asp.net core (2.0 at the time of this writing), The [NotMapped] attribute can be used on the property level.
public class Customer
{
public int Id { set; get; }
public string FirstName { set; get; }
public string LastName { set; get; }
[NotMapped]
public int FullName { set; get; }
}
Fluent API
public class SchoolContext : DbContext
{
public SchoolContext(DbContextOptions<SchoolContext> options) : base(options)
{
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Customer>().Ignore(t => t.FullName);
base.OnModelCreating(modelBuilder);
}
public DbSet<Customer> Customers { get; set; }
}
Regex not operator
No, there's no direct not operator. At least not the way you hope for.
You can use a zero-width negative lookahead, however:
\((?!2001)[0-9a-zA-z _\.\-:]*\)
The (?!...) part means "only match if the text following (hence: lookahead) this doesn't (hence: negative) match this. But it doesn't actually consume the characters it matches (hence: zero-width).
There are actually 4 combinations of lookarounds with 2 axes:
- lookbehind / lookahead : specifies if the characters before or after the point are considered
- positive / negative : specifies if the characters must match or must not match.
How to determine whether code is running in DEBUG / RELEASE build?
Check your project's build settings under 'Apple LLVM - Preprocessing', 'Preprocessor Macros' for debug to ensure that DEBUG is being set - do this by selecting the project and clicking on the build settings tab. Search for DEBUG and look to see if indeed DEBUG is being set.
Pay attention though. You may see DEBUG changed to another variable name such as DEBUG_MODE.
then conditionally code for DEBUG in your source files
#ifdef DEBUG
// Something to log your sensitive data here
#else
//
#endif
Angular 2 @ViewChild annotation returns undefined
A kind of generic approach:
You can create a method that will wait until ViewChild will be ready
function waitWhileViewChildIsReady(parent: any, viewChildName: string, refreshRateSec: number = 50, maxWaitTime: number = 3000): Observable<any> {
return interval(refreshRateSec)
.pipe(
takeWhile(() => !isDefined(parent[viewChildName])),
filter(x => x === undefined),
takeUntil(timer(maxWaitTime)),
endWith(parent[viewChildName]),
flatMap(v => {
if (!parent[viewChildName]) throw new Error(`ViewChild "${viewChildName}" is never ready`);
return of(!parent[viewChildName]);
})
);
}
function isDefined<T>(value: T | undefined | null): value is T {
return <T>value !== undefined && <T>value !== null;
}
Usage:
// Now you can do it in any place of your code
waitWhileViewChildIsReady(this, 'yourViewChildName').subscribe(() =>{
// your logic here
})
Set mouse focus and move cursor to end of input using jQuery
Chris Coyier has a mini jQuery plugin for this which works perfectly well: http://css-tricks.com/snippets/jquery/move-cursor-to-end-of-textarea-or-input/
It uses setSelectionRange if supported, else has a solid fallback.
jQuery.fn.putCursorAtEnd = function() {
return this.each(function() {
$(this).focus()
// If this function exists...
if (this.setSelectionRange) {
// ... then use it (Doesn't work in IE)
// Double the length because Opera is inconsistent about whether a carriage return is one character or two. Sigh.
var len = $(this).val().length * 2;
this.setSelectionRange(len, len);
} else {
// ... otherwise replace the contents with itself
// (Doesn't work in Google Chrome)
$(this).val($(this).val());
}
// Scroll to the bottom, in case we're in a tall textarea
// (Necessary for Firefox and Google Chrome)
this.scrollTop = 999999;
});
};
Then you can just do:
input.putCursorAtEnd();
Cross field validation with Hibernate Validator (JSR 303)
Cross fields validations can be done by creating custom constraints.
Example:- Compare password and confirmPassword fields of User instance.
CompareStrings
@Target({TYPE})
@Retention(RUNTIME)
@Constraint(validatedBy=CompareStringsValidator.class)
@Documented
public @interface CompareStrings {
String[] propertyNames();
StringComparisonMode matchMode() default EQUAL;
boolean allowNull() default false;
String message() default "";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
StringComparisonMode
public enum StringComparisonMode {
EQUAL, EQUAL_IGNORE_CASE, NOT_EQUAL, NOT_EQUAL_IGNORE_CASE
}
CompareStringsValidator
public class CompareStringsValidator implements ConstraintValidator<CompareStrings, Object> {
private String[] propertyNames;
private StringComparisonMode comparisonMode;
private boolean allowNull;
@Override
public void initialize(CompareStrings constraintAnnotation) {
this.propertyNames = constraintAnnotation.propertyNames();
this.comparisonMode = constraintAnnotation.matchMode();
this.allowNull = constraintAnnotation.allowNull();
}
@Override
public boolean isValid(Object target, ConstraintValidatorContext context) {
boolean isValid = true;
List<String> propertyValues = new ArrayList<String> (propertyNames.length);
for(int i=0; i<propertyNames.length; i++) {
String propertyValue = ConstraintValidatorHelper.getPropertyValue(String.class, propertyNames[i], target);
if(propertyValue == null) {
if(!allowNull) {
isValid = false;
break;
}
} else {
propertyValues.add(propertyValue);
}
}
if(isValid) {
isValid = ConstraintValidatorHelper.isValid(propertyValues, comparisonMode);
}
if (!isValid) {
/*
* if custom message was provided, don't touch it, otherwise build the
* default message
*/
String message = context.getDefaultConstraintMessageTemplate();
message = (message.isEmpty()) ? ConstraintValidatorHelper.resolveMessage(propertyNames, comparisonMode) : message;
context.disableDefaultConstraintViolation();
ConstraintViolationBuilder violationBuilder = context.buildConstraintViolationWithTemplate(message);
for (String propertyName : propertyNames) {
NodeBuilderDefinedContext nbdc = violationBuilder.addNode(propertyName);
nbdc.addConstraintViolation();
}
}
return isValid;
}
}
ConstraintValidatorHelper
public abstract class ConstraintValidatorHelper {
public static <T> T getPropertyValue(Class<T> requiredType, String propertyName, Object instance) {
if(requiredType == null) {
throw new IllegalArgumentException("Invalid argument. requiredType must NOT be null!");
}
if(propertyName == null) {
throw new IllegalArgumentException("Invalid argument. PropertyName must NOT be null!");
}
if(instance == null) {
throw new IllegalArgumentException("Invalid argument. Object instance must NOT be null!");
}
T returnValue = null;
try {
PropertyDescriptor descriptor = new PropertyDescriptor(propertyName, instance.getClass());
Method readMethod = descriptor.getReadMethod();
if(readMethod == null) {
throw new IllegalStateException("Property '" + propertyName + "' of " + instance.getClass().getName() + " is NOT readable!");
}
if(requiredType.isAssignableFrom(readMethod.getReturnType())) {
try {
Object propertyValue = readMethod.invoke(instance);
returnValue = requiredType.cast(propertyValue);
} catch (Exception e) {
e.printStackTrace(); // unable to invoke readMethod
}
}
} catch (IntrospectionException e) {
throw new IllegalArgumentException("Property '" + propertyName + "' is NOT defined in " + instance.getClass().getName() + "!", e);
}
return returnValue;
}
public static boolean isValid(Collection<String> propertyValues, StringComparisonMode comparisonMode) {
boolean ignoreCase = false;
switch (comparisonMode) {
case EQUAL_IGNORE_CASE:
case NOT_EQUAL_IGNORE_CASE:
ignoreCase = true;
}
List<String> values = new ArrayList<String> (propertyValues.size());
for(String propertyValue : propertyValues) {
if(ignoreCase) {
values.add(propertyValue.toLowerCase());
} else {
values.add(propertyValue);
}
}
switch (comparisonMode) {
case EQUAL:
case EQUAL_IGNORE_CASE:
Set<String> uniqueValues = new HashSet<String> (values);
return uniqueValues.size() == 1 ? true : false;
case NOT_EQUAL:
case NOT_EQUAL_IGNORE_CASE:
Set<String> allValues = new HashSet<String> (values);
return allValues.size() == values.size() ? true : false;
}
return true;
}
public static String resolveMessage(String[] propertyNames, StringComparisonMode comparisonMode) {
StringBuffer buffer = concatPropertyNames(propertyNames);
buffer.append(" must");
switch(comparisonMode) {
case EQUAL:
case EQUAL_IGNORE_CASE:
buffer.append(" be equal");
break;
case NOT_EQUAL:
case NOT_EQUAL_IGNORE_CASE:
buffer.append(" not be equal");
break;
}
buffer.append('.');
return buffer.toString();
}
private static StringBuffer concatPropertyNames(String[] propertyNames) {
//TODO improve concating algorithm
StringBuffer buffer = new StringBuffer();
buffer.append('[');
for(String propertyName : propertyNames) {
char firstChar = Character.toUpperCase(propertyName.charAt(0));
buffer.append(firstChar);
buffer.append(propertyName.substring(1));
buffer.append(", ");
}
buffer.delete(buffer.length()-2, buffer.length());
buffer.append("]");
return buffer;
}
}
User
@CompareStrings(propertyNames={"password", "confirmPassword"})
public class User {
private String password;
private String confirmPassword;
public String getPassword() { return password; }
public void setPassword(String password) { this.password = password; }
public String getConfirmPassword() { return confirmPassword; }
public void setConfirmPassword(String confirmPassword) { this.confirmPassword = confirmPassword; }
}
Test
public void test() {
User user = new User();
user.setPassword("password");
user.setConfirmPassword("paSSword");
Set<ConstraintViolation<User>> violations = beanValidator.validate(user);
for(ConstraintViolation<User> violation : violations) {
logger.debug("Message:- " + violation.getMessage());
}
Assert.assertEquals(violations.size(), 1);
}
Output Message:- [Password, ConfirmPassword] must be equal.
By using the CompareStrings validation constraint, we can also compare more than two properties and we can mix any of four string comparison methods.
ColorChoice
@CompareStrings(propertyNames={"color1", "color2", "color3"}, matchMode=StringComparisonMode.NOT_EQUAL, message="Please choose three different colors.")
public class ColorChoice {
private String color1;
private String color2;
private String color3;
......
}
Test
ColorChoice colorChoice = new ColorChoice();
colorChoice.setColor1("black");
colorChoice.setColor2("white");
colorChoice.setColor3("white");
Set<ConstraintViolation<ColorChoice>> colorChoiceviolations = beanValidator.validate(colorChoice);
for(ConstraintViolation<ColorChoice> violation : colorChoiceviolations) {
logger.debug("Message:- " + violation.getMessage());
}
Output Message:- Please choose three different colors.
Similarly, we can have CompareNumbers, CompareDates, etc cross-fields validation constraints.
P.S. I have not tested this code under production environment (though I tested it under dev environment), so consider this code as Milestone Release. If you find a bug, please write a nice comment. :)
VB.Net Properties - Public Get, Private Set
I find marking the property as readonly cleaner than the above answers. I believe vb14 is required.
Private _Name As String
Public ReadOnly Property Name() As String
Get
Return _Name
End Get
End Property
This can be condensed to
Public ReadOnly Property Name As String
https://msdn.microsoft.com/en-us/library/dd293589.aspx?f=255&MSPPError=-2147217396
How to set environment variables from within package.json?
For a larger set of environment variables or when you want to reuse them you can use env-cmd.
./.env file:
# This is a comment
ENV1=THANKS
ENV2=FOR ALL
ENV3=THE FISH
./package.json:
{
"scripts": {
"test": "env-cmd mocha -R spec"
}
}
Auto Scale TextView Text to Fit within Bounds
Here is the approach I take. It's very simple. It uses successive approximation to zero in on the fontsize and can generally have it figured out in less than 10 iterations. Just replace "activityWidth" with the width of whatever view you are using to display the text in. In my example, it's set as a private field to the screen's width. The inital fontsize of 198 is only set in the event the method generates an exception (which really should never happen):
private float GetFontSizeForScreenWidth(String text)
{
float fontsize = 198;
try
{
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.RED);
Typeface typeface = Typeface.create("Helvetica", Typeface.BOLD);
paint.setTypeface(typeface);
paint.setTextAlign(Align.CENTER);
int lowVal = 0;
int highVal = 2000;
int currentVal = highVal;
/*
* Successively approximate the screen size until it is
* within 2 pixels of the maximum screen width. Generally
* this will get you to the closest font size within about 10
* iterations.
*/
do
{
paint.setTextSize(currentVal);
float textWidth = paint.measureText(text);
float diff = activityWidth - textWidth;
if ((diff >= 0) && (diff <= 2))
{
fontsize = paint.getTextSize();
return fontsize;
}
if (textWidth > activityWidth)
highVal = currentVal;
else if (textWidth < activityWidth)
lowVal = currentVal;
else
{
fontsize = paint.getTextSize();
return fontsize;
}
currentVal = (highVal - lowVal) / 2 + lowVal;
} while (true);
}
catch (Exception ex)
{
return fontsize;
}
}
What is C# equivalent of <map> in C++?
.NET Framework provides many collection classes too. You can use Dictionary in C#. Please find the below msdn link for details and samples http://msdn.microsoft.com/en-us/library/xfhwa508.aspx
jquery ajax get responsetext from http url
First you have to download a JQuery plugin to allow Cross-domain requests. Download it here: https://github.com/padolsey/jQuery-Plugins/downloads
Import the file called query.xdomainsajax.js into your project and include it with this code:
<script type="text/javascript" src="/path/to/the/file/jquery.xdomainajax.js"></script>
To get the html of an external web page in text form you can write this:
$.ajax({
url: "http://www.website.com",
type: 'GET',
success: function(res) {
var text = res.responseText;
// then you can manipulate your text as you wish
}
});
Select element based on multiple classes
You mean two classes? "Chain" the selectors (no spaces between them):
.class1.class2 {
/* style here */
}
This selects all elements with class1 that also have class2.
In your case:
li.left.ui-class-selector {
}
Official documentation : CSS2 class selectors.
As akamike points out a problem with this method in Internet Explorer 6 you might want to read this: Use double classes in IE6 CSS?
android - setting LayoutParams programmatically
For Xamarin Android align to the left of an object
int dp24 = (int)TypedValue.ApplyDimension( ComplexUnitType.Dip, 24, Resources.System.DisplayMetrics );
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams( dp24, dp24 );
lp.AddRule( LayoutRules.CenterInParent, 1 );
lp.AddRule( LayoutRules.LeftOf, //Id of the field Eg m_Button.Id );
m_Button.LayoutParameters = lp;
Proper usage of Java -D command-line parameters
I suspect the problem is that you've put the "-D" after the -jar. Try this:
java -Dtest="true" -jar myApplication.jar
From the command line help:
java [-options] -jar jarfile [args...]
In other words, the way you've got it at the moment will treat -Dtest="true" as one of the arguments to pass to main instead of as a JVM argument.
(You should probably also drop the quotes, but it may well work anyway - it probably depends on your shell.)
how to File.listFiles in alphabetical order?
In Java 8:
Arrays.sort(files, (a, b) -> a.getName().compareTo(b.getName()));
Reverse order:
Arrays.sort(files, (a, b) -> -a.getName().compareTo(b.getName()));
How can I get the current user directory?
you can use the following code:
if(Platform.Equals("WinCE"))
{
m_CurrentPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase);
}
else if(Platform.Equals("Win32NT"))
{
m_CurrentPath = Directory.GetCurrentDirectory();
}
more information see: Get Current Directory Path in both WinXP and WinCE with C#
How to install "make" in ubuntu?
I have no idea what linux distribution "ubuntu centOS" is. Ubuntu and CentOS are two different distributions.
To answer the question in the header: To install make in ubuntu you have to install build-essentials
sudo apt-get install build-essential
What is better, adjacency lists or adjacency matrices for graph problems in C++?
It depends on the problem.
- Uses O(n^2) memory
- It is fast to lookup and check for presence or absence of a specific edge
between any two nodes O(1) - It is slow to iterate over all edges
- It is slow to add/delete a node; a complex operation O(n^2)
- It is fast to add a new edge O(1)
- Memory usage depends on the number of edges (not number of nodes),
which might save a lot of memory if the adjacency matrix is sparse - Finding the presence or absence of specific edge between any two nodes
is slightly slower than with the matrix O(k); where k is the number of neighbors nodes - It is fast to iterate over all edges because you can access any node neighbors directly
- It is fast to add/delete a node; easier than the matrix representation
- It fast to add a new edge O(1)
Android: How to create a Dialog without a title?
set the "gravity" attribute on the entire dialog to "center". Then you will need to override that setting to all of the child components in the dialog that you do not want centered.
Excel Macro - Select all cells with data and format as table
Try this one for current selection:
Sub A_SelectAllMakeTable2()
Dim tbl As ListObject
Set tbl = ActiveSheet.ListObjects.Add(xlSrcRange, Selection, , xlYes)
tbl.TableStyle = "TableStyleMedium15"
End Sub
or equivalent of your macro (for Ctrl+Shift+End range selection):
Sub A_SelectAllMakeTable()
Dim tbl As ListObject
Dim rng As Range
Set rng = Range(Range("A1"), Range("A1").SpecialCells(xlLastCell))
Set tbl = ActiveSheet.ListObjects.Add(xlSrcRange, rng, , xlYes)
tbl.TableStyle = "TableStyleMedium15"
End Sub
Imported a csv-dataset to R but the values becomes factors
This only worked right for me when including strip.white = TRUE in the read.csv command.
(I found the solution here.)
Get skin path in Magento?
First of all it is not recommended to have php files with functions in design folder. You should create a new module or extend (copy from core to local a helper and add function onto that class) and do not change files from app/code/core.
To answer to your question you can use:
require(Mage::getBaseDir('design').'/frontend/default/mytheme/myfunc.php');
Best practice (as a start) will be to create in /app/code/local/Mage/Core/Helper/Extra.php a php file:
<?php
class Mage_Core_Helper_Extra extends Mage_Core_Helper_Abstract
{
public function getSomething()
{
return 'Someting';
}
}
And to use it in phtml files use:
$this->helper('core/extra')->getSomething();
Or in all the places:
Mage::helper('core/extra')->getSomething();
Constructor overload in TypeScript
You can handle this by :
class Box {
x: number;
y: number;
height: number;
width: number;
constructor(obj?: Partial<Box>) {
assign(this, obj);
}
}
Partial will make your fields (x,y, height, width) optionals, allowing multiple constructors
eg: you can do new Box({x,y}) without height, and width.
Script for rebuilding and reindexing the fragmented index?
Query for REBUILD/REORGANIZE Indexes
- 30%<= Rebuild
- 5%<= Reorganize
- 5%> do nothing
Query:
SELECT OBJECT_NAME(ind.OBJECT_ID) AS TableName,
ind.name AS IndexName, indexstats.index_type_desc AS IndexType,
indexstats.avg_fragmentation_in_percent,
'ALTER INDEX ' + QUOTENAME(ind.name) + ' ON ' +QUOTENAME(object_name(ind.object_id)) +
CASE WHEN indexstats.avg_fragmentation_in_percent>30 THEN ' REBUILD '
WHEN indexstats.avg_fragmentation_in_percent>=5 THEN 'REORGANIZE'
ELSE NULL END as [SQLQuery] -- if <5 not required, so no query needed
FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, NULL) indexstats
INNER JOIN sys.indexes ind ON ind.object_id = indexstats.object_id
AND ind.index_id = indexstats.index_id
WHERE
--indexstats.avg_fragmentation_in_percent , e.g. >10, you can specify any number in percent
ind.Name is not null
ORDER BY indexstats.avg_fragmentation_in_percent DESC
Output
TableName IndexName IndexType avg_fragmentation_in_percent SQLQuery
--------------------------------------------------------------------------------------- ------------------------------------------------------
Table1 PK_Table1 CLUSTERED INDEX 75 ALTER INDEX [PK_Table1] ON [Table1] REBUILD
Table1 IX_Table1_col1_col2 NONCLUSTERED INDEX 66,6666666666667 ALTER INDEX [IX_Table1_col1_col2] ON [Table1] REBUILD
Table2 IX_Table2_ NONCLUSTERED INDEX 10 ALTER INDEX [IX_Table2_] ON [Table2] REORGANIZE
Table2 IX_Table2_ NONCLUSTERED INDEX 3 NULL
How can I format a String number to have commas and round?
Here is the simplest way to get there:
String number = "10987655.876";
double result = Double.parseDouble(number);
System.out.println(String.format("%,.2f",result));
output: 10,987,655.88
Get list of passed arguments in Windows batch script (.bat)
Lot of the information above led me to further research and ultimately my answer so I wanted to contribute what I wound up doing in hopes it helps someone else:
I also wanted to pass a varied number of variables to a batch file so that they could be processed within the file.
I was ok with passing them to the batch file using quotes
I would want them processed similar to the below - but using a loop instead of writing out manually:
So I wanted to execute this:
prog_ZipDeleteFiles.bat "_appPath=C:\Services\Logs\PCAP" "_appFile=PCAP*.?"
And via the magic of for loops do this within the batch file:
set "_appPath=C:\Services\Logs\PCAP"
set "_appFile=PCAP*.?"
Problem I was having is that all my attempts to use a for loop weren't working. The below example:
for /f "tokens* delims= " in %%A (%*) DO (
set %%A
)
would just do:
set "_appPath=C:\Services\Logs\PCAP"
and not:
set "_appPath=C:\Services\Logs\PCAP"
set "_appFile=PCAP*.?"
even after setting
SETLOCAL EnableDelayedExpansion
Reason was that the for loop read the whole line and assigned my second parameter to %%B during the first iteration of the loop. Because %* represents all arguments, there is only a single line to process - ergo only one pass of the for loop happens. This is by design it turns out, and my logic was wrong.
So I stopped trying to use a for loop and simplified what I was trying to do by using if, shift, and a goto statement. Agreed its a bit of a hack but it's more suited to my needs. I can loop through all of the arguments and then use an if statement to drop out of the loop once I process them all.
The winning statement for what I was trying to accomplish:
echo on
:processArguments
:: Process all arguments in the order received
if defined %1 then (
set %1
shift
goto:processArguments
) ELSE (
echo off
)
UPDATE - I had to modify to the below instead, I was exposing all of the environment variables when trying to reference %1 and using shift in this manner:
echo on
shift
:processArguments
:: Process all arguments in the order received
if defined %0 then (
set %0
shift
goto:processArguments
) ELSE (
echo off
)
Array vs ArrayList in performance
It is pretty obvious that array[10] is faster than array.get(10), as the later internally does the same call, but adds the overhead for the function call plus additional checks.
Modern JITs however will optimize this to a degree, that you rarely have to worry about this, unless you have a very performance critical application and this has been measured to be your bottleneck.
'if' statement in jinja2 template
We need to remember that the {% endif %} comes after the {% else %}.
So this is an example:
{% if someTest %}
<p> Something is True </p>
{% else %}
<p> Something is False </p>
{% endif %}
How can I align all elements to the left in JPanel?
My favorite method to use would be the BorderLayout method. Here are the five examples with each position the component could go in. The example is for if the component were a button. We will add it to a JPanel, p. The button will be called b.
//To align it to the left
p.add(b, BorderLayout.WEST);
//To align it to the right
p.add(b, BorderLayout.EAST);
//To align it at the top
p.add(b, BorderLayout.NORTH);
//To align it to the bottom
p.add(b, BorderLayout.SOUTH);
//To align it to the center
p.add(b, BorderLayout.CENTER);
Don't forget to import it as well by typing:
import java.awt.BorderLayout;
There are also other methods in the BorderLayout class involving things like orientation, but you can do your own research on that if you curious about that. I hope this helped!
Indexing vectors and arrays with +:
Description and examples can be found in IEEE Std 1800-2017 § 11.5.1 "Vector bit-select and part-select addressing". First IEEE appearance is IEEE 1364-2001 (Verilog) § 4.2.1 "Vector bit-select and part-select addressing". Here is an direct example from the LRM:
logic [31: 0] a_vect; logic [0 :31] b_vect; logic [63: 0] dword; integer sel; a_vect[ 0 +: 8] // == a_vect[ 7 : 0] a_vect[15 -: 8] // == a_vect[15 : 8] b_vect[ 0 +: 8] // == b_vect[0 : 7] b_vect[15 -: 8] // == b_vect[8 :15] dword[8*sel +: 8] // variable part-select with fixed width
If sel is 0 then dword[8*(0) +: 8] == dword[7:0]
If sel is 7 then dword[8*(7) +: 8] == dword[63:56]
The value to the left always the starting index. The number to the right is the width and must be a positive constant. the + and - indicates to select the bits of a higher or lower index value then the starting index.
Assuming address is in little endian ([msb:lsb]) format, then if(address[2*pointer+:2]) is the equivalent of if({address[2*pointer+1],address[2*pointer]})
How do I access Configuration in any class in ASP.NET Core?
I know there may be several ways to do this, I'm using Core 3.1 and was looking for the optimal/cleaner option and I ended up doing this:
- My startup class is as default
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddControllers();
}
- My appsettings.json is like this
{
"CompanySettings": {
"name": "Fake Co"
}
}
- My class is an API Controller, so first I added the using reference and then injected the IConfiguration interface
using Microsoft.Extensions.Configuration;
public class EmployeeController
{
private IConfiguration _configuration;
public EmployeeController(IConfiguration configuration)
{
_configuration = configuration;
}
}
- Finally I used the GetValue method
public async Task<IActionResult> Post([FromBody] EmployeeModel form)
{
var companyName = configuration.GetValue<string>("CompanySettings:name");
// companyName = "Fake Co"
}
How to add hamburger menu in bootstrap
CSS only (no icon sets) Codepen
.nav-link #navBars {_x000D_
margin-top: -3px;_x000D_
padding: 8px 15px 3px;_x000D_
border: 1px solid rgba(0,0,0,.125);_x000D_
border-radius: .25rem;_x000D_
}_x000D_
_x000D_
.nav-link #navBars input {_x000D_
display: none;_x000D_
}_x000D_
_x000D_
.nav-link #navBars span {_x000D_
position: relative;_x000D_
z-index: 1;_x000D_
display: block;_x000D_
margin-bottom: 6px;_x000D_
width: 24px;_x000D_
height: 2px;_x000D_
background-color: rgba(125, 125, 126, 1);_x000D_
border-radius: .25rem;_x000D_
}<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" rel="stylesheet"/>_x000D_
<nav class="navbar navbar-expand-lg navbar-light bg-light">_x000D_
<!-- <a class="navbar-brand" href="#">_x000D_
<img src="https://getbootstrap.com/docs/4.0/assets/brand/bootstrap-solid.svg" width="30" height="30" class="d-inline-block align-top" alt="">_x000D_
Bootstrap_x000D_
</a> -->_x000D_
<!-- https://stackoverflow.com/questions/26317679 -->_x000D_
<a class="nav-link" href="#">_x000D_
<div id="navBars">_x000D_
<input type="checkbox" /><span></span>_x000D_
<span></span>_x000D_
<span></span>_x000D_
</div>_x000D_
</a>_x000D_
<!-- /26317679 -->_x000D_
<div class="collapse navbar-collapse" id="navbarNav">_x000D_
<ul class="navbar-nav">_x000D_
<li class="nav-item active"><a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a></li>_x000D_
<li class="nav-item"><a class="nav-link" href="#">Features</a></li>_x000D_
<li class="nav-item"><a class="nav-link" href="#">Pricing</a></li>_x000D_
<li class="nav-item"><a class="nav-link disabled" href="#">Disabled</a></li>_x000D_
</ul>_x000D_
</div>_x000D_
</nav>Copying HTML code in Google Chrome's inspect element
using httrack software you can download all the website content in your local. httrack : http://www.httrack.com/
How to implement linear interpolation?
import scipy.interpolate
y_interp = scipy.interpolate.interp1d(x, y)
print y_interp(5.0)
scipy.interpolate.interp1d does linear interpolation by and can be customized to handle error conditions.
C++ queue - simple example
std::queue<myclass*> that's it
How does one extract each folder name from a path?
Inspired by the earlier answers, but simpler, and without recursion. Also, it does not care what the separation symbol is, as Dir.Parent covers this:
/// <summary>
/// Split a directory in its components.
/// Input e.g: a/b/c/d.
/// Output: d, c, b, a.
/// </summary>
/// <param name="Dir"></param>
/// <returns></returns>
public static IEnumerable<string> DirectorySplit(this DirectoryInfo Dir)
{
while (Dir != null)
{
yield return Dir.Name;
Dir = Dir.Parent;
}
}
Either stick this in a static class to create a nice extension method, or just leave out the this (and static).
Usage example (as an extension method) to access the path parts by number:
/// <summary>
/// Return one part of the directory path.
/// Path e.g.: a/b/c/d. PartNr=0 is a, Nr 2 = c.
/// </summary>
/// <param name="Dir"></param>
/// <param name="PartNr"></param>
/// <returns></returns>
public static string DirectoryPart(this DirectoryInfo Dir, int PartNr)
{
string[] Parts = Dir.DirectorySplit().ToArray();
int L = Parts.Length;
return PartNr >= 0 && PartNr < L ? Parts[L - 1 - PartNr] : "";
}
Both above methods are now in my personal library, hence the xml comments. Usage example:
DirectoryInfo DI_Data = new DirectoryInfo(@"D:\Hunter\Data\2019\w38\abc\000.d");
label_Year.Text = DI_Data.DirectoryPart(3); // --> 2019
label_Entry.Text = DI_Data.DirectoryPart(6);// --> 000.d
Threading Example in Android
One of Androids powerful feature is the AsyncTask class.
To work with it, you have to first extend it and override doInBackground(...).
doInBackground automatically executes on a worker thread, and you can add some
listeners on the UI Thread to get notified about status update, those functions are
called: onPreExecute(), onPostExecute() and onProgressUpdate()
You can find a example here.
Refer to below post for other alternatives:
What's a standard way to do a no-op in python?
Use pass for no-op:
if x == 0:
pass
else:
print "x not equal 0"
And here's another example:
def f():
pass
Or:
class c:
pass
How to write to files using utl_file in oracle
Here is a robust function for using UTL_File.putline that includes the necessary error handling. It also handles headers, footers and a few other exceptional cases.
PROCEDURE usp_OUTPUT_ToFileAscii(p_Path IN VARCHAR2, p_FileName IN VARCHAR2, p_Input IN refCursor, p_Header in VARCHAR2, p_Footer IN VARCHAR2, p_WriteMode VARCHAR2) IS
vLine VARCHAR2(30000);
vFile UTL_FILE.file_type;
vExists boolean;
vLength number;
vBlockSize number;
BEGIN
UTL_FILE.fgetattr(p_path, p_FileName, vExists, vLength, vBlockSize);
FETCH p_Input INTO vLine;
IF p_input%ROWCOUNT > 0
THEN
IF vExists THEN
vFile := UTL_FILE.FOPEN_NCHAR(p_Path, p_FileName, p_WriteMode);
ELSE
--even if the append flag is passed if the file doesn't exist open it with W.
vFile := UTL_FILE.FOPEN(p_Path, p_FileName, 'W');
END IF;
--GET HANDLE TO FILE
IF p_Header IS NOT NULL THEN
UTL_FILE.PUT_LINE(vFile, p_Header);
END IF;
UTL_FILE.PUT_LINE(vFile, vLine);
DBMS_OUTPUT.PUT_LINE('Record count > 0');
--LOOP THROUGH CURSOR VAR
LOOP
FETCH p_Input INTO vLine;
EXIT WHEN p_Input%NOTFOUND;
UTL_FILE.PUT_LINE(vFile, vLine);
END LOOP;
IF p_Footer IS NOT NULL THEN
UTL_FILE.PUT_LINE(vFile, p_Footer);
END IF;
CLOSE p_Input;
UTL_FILE.FCLOSE(vFile);
ELSE
DBMS_OUTPUT.PUT_LINE('Record count = 0');
END IF;
EXCEPTION
WHEN UTL_FILE.INVALID_PATH THEN
DBMS_OUTPUT.PUT_LINE ('invalid_path');
DBMS_OUTPUT.PUT_LINE(SQLERRM);
RAISE;
WHEN UTL_FILE.INVALID_MODE THEN
DBMS_OUTPUT.PUT_LINE ('invalid_mode');
DBMS_OUTPUT.PUT_LINE(SQLERRM);
RAISE;
WHEN UTL_FILE.INVALID_FILEHANDLE THEN
DBMS_OUTPUT.PUT_LINE ('invalid_filehandle');
DBMS_OUTPUT.PUT_LINE(SQLERRM);
RAISE;
WHEN UTL_FILE.INVALID_OPERATION THEN
DBMS_OUTPUT.PUT_LINE ('invalid_operation');
DBMS_OUTPUT.PUT_LINE(SQLERRM);
RAISE;
WHEN UTL_FILE.READ_ERROR THEN
DBMS_OUTPUT.PUT_LINE ('read_error');
DBMS_OUTPUT.PUT_LINE(SQLERRM);
RAISE;
WHEN UTL_FILE.WRITE_ERROR THEN
DBMS_OUTPUT.PUT_LINE ('write_error');
DBMS_OUTPUT.PUT_LINE(SQLERRM);
RAISE;
WHEN UTL_FILE.INTERNAL_ERROR THEN
DBMS_OUTPUT.PUT_LINE ('internal_error');
DBMS_OUTPUT.PUT_LINE(SQLERRM);
RAISE;
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE ('other write error');
DBMS_OUTPUT.PUT_LINE(SQLERRM);
RAISE;
END;
No output to console from a WPF application?
You can use
Trace.WriteLine("text");
This will output to the "Output" window in Visual Studio (when debugging).
make sure to have the Diagnostics assembly included:
using System.Diagnostics;
How to check if a user is logged in (how to properly use user.is_authenticated)?
Django 1.10+
Use an attribute, not a method:
if request.user.is_authenticated: # <- no parentheses any more!
# do something if the user is authenticated
The use of the method of the same name is deprecated in Django 2.0, and is no longer mentioned in the Django documentation.
Note that for Django 1.10 and 1.11, the value of the property is a
CallableBool and not a boolean, which can cause some strange bugs.
For example, I had a view that returned JSON
return HttpResponse(json.dumps({
"is_authenticated": request.user.is_authenticated()
}), content_type='application/json')
that after updated to the property request.user.is_authenticated was throwing the exception TypeError: Object of type 'CallableBool' is not JSON serializable. The solution was to use JsonResponse, which could handle the CallableBool object properly when serializing:
return JsonResponse({
"is_authenticated": request.user.is_authenticated
})
Download File Using Javascript/jQuery
let args = {"data":htmlData,"filename":exampleName}
To create a HTMl file and download
window.downloadHTML = function(args) {
var data, filename, link;
var csv = args.data;
if (csv == null) return;
filename = args.filename || 'report.html';
data = 'data:text/html;charset=utf-8,' + encodeURIComponent(csv);
console.log(data);
link = document.createElement('a');
link.setAttribute('href', data);
link.setAttribute('download', filename);
document.body.appendChild(link);
link.click();
document.body.removeChild(link);}
To create and download a CSV
window.downloadCSV = function(args) {
var data, filename, link;
var csv = args.data;
if (csv == null) return;
filename = args.filename || 'report.csv';
if (!csv.match(/^data:text\/csv/i)) {
csv = 'data:text/csv;charset=utf-8,' + csv;
}
data = encodeURI(csv);
link = document.createElement('a');
link.setAttribute('href', data);
link.setAttribute('download', filename);
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}
Use multiple @font-face rules in CSS
Note, you may also be interested in:
Custom web font not working in IE9
Which includes a more descriptive breakdown of the CSS you see below (and explains the tweaks that make it work better on IE6-9).
@font-face {
font-family: 'Bumble Bee';
src: url('bumblebee-webfont.eot');
src: local('?'),
url('bumblebee-webfont.woff') format('woff'),
url('bumblebee-webfont.ttf') format('truetype'),
url('bumblebee-webfont.svg#webfontg8dbVmxj') format('svg');
}
@font-face {
font-family: 'GestaReFogular';
src: url('gestareg-webfont.eot');
src: local('?'),
url('gestareg-webfont.woff') format('woff'),
url('gestareg-webfont.ttf') format('truetype'),
url('gestareg-webfont.svg#webfontg8dbVmxj') format('svg');
}
body {
background: #fff url(../images/body-bg-corporate.gif) repeat-x;
padding-bottom: 10px;
font-family: 'GestaRegular', Arial, Helvetica, sans-serif;
}
h1 {
font-family: "Bumble Bee", "Times New Roman", Georgia, Serif;
}
And your follow-up questions:
Q. I would like to use a font such as "Bumble bee," for example. How can I use
@font-faceto make that font available on the user's computer?
Note that I don't know what the name of your Bumble Bee font or file is, so adjust accordingly, and that the font-face declaration should precede (come before) your use of it, as I've shown above.
Q. Can I still use the other
@font-facetypeface "GestaRegular" as well? Can I use both in the same stylesheet?
Just list them together as I've shown in my example. There is no reason you can't declare both. All that @font-face does is instruct the browser to download and make a font-family available. See: http://iliadraznin.com/2009/07/css3-font-face-multiple-weights
How are parameters sent in an HTTP POST request?
The content is put after the HTTP headers. The format of an HTTP POST is to have the HTTP headers, followed by a blank line, followed by the request body. The POST variables are stored as key-value pairs in the body.
You can see this in the raw content of an HTTP Post, shown below:
POST /path/script.cgi HTTP/1.0
From: [email protected]
User-Agent: HTTPTool/1.0
Content-Type: application/x-www-form-urlencoded
Content-Length: 32
home=Cosby&favorite+flavor=flies
You can see this using a tool like Fiddler, which you can use to watch the raw HTTP request and response payloads being sent across the wire.
HTML input textbox with a width of 100% overflows table cells
Take out the "http://www.w3.org/TR/html4/loose.dtd" from the DOCTYPE declaration and it fix your problem.
Cheers! :)
Python: Find in list
lstr=[1, 2, 3]
lstr=map(str,lstr)
r=re.compile('^(3){1}')
results=list(filter(r.match,lstr))
print(results)
Runtime error: Could not load file or assembly 'System.Web.WebPages.Razor, Version=3.0.0.0
You can find it in Nuget Package Microsoft ASP.NET Web Pages Version 3.2.0
If you have a reference to an earlier version than 3.0.0.0, Delete the reference, add the reference to the correct .dll in your packages folder and make sure "Copy Local" is set to "True" in the properties of the .dll.
Then in your web.config (as mentioned by @MichaelEvanchik)
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages.Razor" PublicKeyToken="31bf3856ad364e35"/>
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
</dependentAssembly>
</assemblyBinding>
How to validate IP address in Python?
Don't parse it. Just ask.
import socket
try:
socket.inet_aton(addr)
# legal
except socket.error:
# Not legal
Update Rows in SSIS OLEDB Destination
Use Lookupstage to decide whether to insert or update. Check this link for more info - http://beingoyen.blogspot.com/2010/03/ssis-how-to-update-instead-of-insert.html
Steps to do update:
- Drag OLEDB Command [instead of oledb destination]
- Go to properties window
Under Custom properties select SQLCOMMAND and insert update command ex:
UPDATE table1 SET col1 = ?, col2 = ? where id = ?
map columns in exact order from source to output as in update command
Deleting all files from a folder using PHP?
Another solution: This Class delete all files, subdirectories and files in the sub directories.
class Your_Class_Name {
/**
* @see http://php.net/manual/de/function.array-map.php
* @see http://www.php.net/manual/en/function.rmdir.php
* @see http://www.php.net/manual/en/function.glob.php
* @see http://php.net/manual/de/function.unlink.php
* @param string $path
*/
public function delete($path) {
if (is_dir($path)) {
array_map(function($value) {
$this->delete($value);
rmdir($value);
},glob($path . '/*', GLOB_ONLYDIR));
array_map('unlink', glob($path."/*"));
}
}
}
Unable to execute dex: Multiple dex files define Lcom/myapp/R$array;
I was basically facing the same issue. I deleted the BIN folder, then removed unused jar files for Order and Import from eclipse. IT WORKED after that
Convert string to date then format the date
Tested this code
java.text.DateFormat formatter = new java.text.SimpleDateFormat("MM-dd-yyyy");
java.util.Date newDate = new java.util.Date();
System.out.println(formatter.format(newDate ));
http://download.oracle.com/javase/1,5.0/docs/api/java/text/SimpleDateFormat.html
File loading by getClass().getResource()
getClass().getResource() uses the class loader to load the resource. This means that the resource must be in the classpath to be loaded.
When doing it with Eclipse, everything you put in the source folder is "compiled" by Eclipse:
- .java files are compiled into .class files that go the the bin directory (by default)
- other files are copied to the bin directory (respecting the package/folder hirearchy)
When launching the program with Eclipse, the bin directory is thus in the classpath, and since it contains the Test.properties file, this file can be loaded by the class loader, using getResource() or getResourceAsStream().
If it doesn't work from the command line, it's thus because the file is not in the classpath.
Note that you should NOT do
FileInputStream inputStream = new FileInputStream(new File(getClass().getResource(url).toURI()));
to load a resource. Because that can work only if the file is loaded from the file system. If you package your app into a jar file, or if you load the classes over a network, it won't work. To get an InputStream, just use
getClass().getResourceAsStream("Test.properties")
And finally, as the documentation indicates,
Foo.class.getResourceAsStream("Test.properties")
will load a Test.properties file located in the same package as the class Foo.
Foo.class.getResourceAsStream("/com/foo/bar/Test.properties")
will load a Test.properties file located in the package com.foo.bar.
CertificateException: No name matching ssl.someUrl.de found
The server name should be same as the first/last name which you give while create a certificate
How to create a floating action button (FAB) in android, using AppCompat v21?
I've generally used xml drawables to create shadow/elevation on a pre-lollipop widget. Here, for example, is an xml drawable that can be used on pre-lollipop devices to simulate the floating action button's elevation.
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:top="8px">
<layer-list>
<item>
<shape android:shape="oval">
<solid android:color="#08000000"/>
<padding
android:bottom="3px"
android:left="3px"
android:right="3px"
android:top="3px"
/>
</shape>
</item>
<item>
<shape android:shape="oval">
<solid android:color="#09000000"/>
<padding
android:bottom="2px"
android:left="2px"
android:right="2px"
android:top="2px"
/>
</shape>
</item>
<item>
<shape android:shape="oval">
<solid android:color="#10000000"/>
<padding
android:bottom="2px"
android:left="2px"
android:right="2px"
android:top="2px"
/>
</shape>
</item>
<item>
<shape android:shape="oval">
<solid android:color="#11000000"/>
<padding
android:bottom="1px"
android:left="1px"
android:right="1px"
android:top="1px"
/>
</shape>
</item>
<item>
<shape android:shape="oval">
<solid android:color="#12000000"/>
<padding
android:bottom="1px"
android:left="1px"
android:right="1px"
android:top="1px"
/>
</shape>
</item>
<item>
<shape android:shape="oval">
<solid android:color="#13000000"/>
<padding
android:bottom="1px"
android:left="1px"
android:right="1px"
android:top="1px"
/>
</shape>
</item>
<item>
<shape android:shape="oval">
<solid android:color="#14000000"/>
<padding
android:bottom="1px"
android:left="1px"
android:right="1px"
android:top="1px"
/>
</shape>
</item>
<item>
<shape android:shape="oval">
<solid android:color="#15000000"/>
<padding
android:bottom="1px"
android:left="1px"
android:right="1px"
android:top="1px"
/>
</shape>
</item>
<item>
<shape android:shape="oval">
<solid android:color="#16000000"/>
<padding
android:bottom="1px"
android:left="1px"
android:right="1px"
android:top="1px"
/>
</shape>
</item>
<item>
<shape android:shape="oval">
<solid android:color="#17000000"/>
<padding
android:bottom="1px"
android:left="1px"
android:right="1px"
android:top="1px"
/>
</shape>
</item>
</layer-list>
</item>
<item>
<shape android:shape="oval">
<solid android:color="?attr/colorPrimary"/>
</shape>
</item>
</layer-list>
In place of ?attr/colorPrimary you can choose any color. Here's a screenshot of the result:
What does $ mean before a string?
It is more convenient than string.Format and you can use intellisense here too.
And here is my test method:
[TestMethod]
public void StringMethodsTest_DollarSign()
{
string name = "Forrest";
string surname = "Gump";
int year = 3;
string sDollarSign = $"My name is {name} {surname} and once I run more than {year} years.";
string expectedResult = "My name is Forrest Gump and once I run more than 3 years.";
Assert.AreEqual(expectedResult, sDollarSign);
}
Setting dynamic scope variables in AngularJs - scope.<some_string>
Create Dynamic angular variables from results
angular.forEach(results, function (value, key) {
if (key != null) {
$parse(key).assign($scope, value);
}
});
ps. don't forget to pass in the $parse attribute into your controller's function
What is the purpose of meshgrid in Python / NumPy?
The purpose of meshgrid is to create a rectangular grid out of an array of x values and an array of y values.
So, for example, if we want to create a grid where we have a point at each integer value between 0 and 4 in both the x and y directions. To create a rectangular grid, we need every combination of the x and y points.
This is going to be 25 points, right? So if we wanted to create an x and y array for all of these points, we could do the following.
x[0,0] = 0 y[0,0] = 0
x[0,1] = 1 y[0,1] = 0
x[0,2] = 2 y[0,2] = 0
x[0,3] = 3 y[0,3] = 0
x[0,4] = 4 y[0,4] = 0
x[1,0] = 0 y[1,0] = 1
x[1,1] = 1 y[1,1] = 1
...
x[4,3] = 3 y[4,3] = 4
x[4,4] = 4 y[4,4] = 4
This would result in the following x and y matrices, such that the pairing of the corresponding element in each matrix gives the x and y coordinates of a point in the grid.
x = 0 1 2 3 4 y = 0 0 0 0 0
0 1 2 3 4 1 1 1 1 1
0 1 2 3 4 2 2 2 2 2
0 1 2 3 4 3 3 3 3 3
0 1 2 3 4 4 4 4 4 4
We can then plot these to verify that they are a grid:
plt.plot(x,y, marker='.', color='k', linestyle='none')
Obviously, this gets very tedious especially for large ranges of x and y. Instead, meshgrid can actually generate this for us: all we have to specify are the unique x and y values.
xvalues = np.array([0, 1, 2, 3, 4]);
yvalues = np.array([0, 1, 2, 3, 4]);
Now, when we call meshgrid, we get the previous output automatically.
xx, yy = np.meshgrid(xvalues, yvalues)
plt.plot(xx, yy, marker='.', color='k', linestyle='none')
Creation of these rectangular grids is useful for a number of tasks. In the example that you have provided in your post, it is simply a way to sample a function (sin(x**2 + y**2) / (x**2 + y**2)) over a range of values for x and y.
Because this function has been sampled on a rectangular grid, the function can now be visualized as an "image".
Additionally, the result can now be passed to functions which expect data on rectangular grid (i.e. contourf)
How to open a folder in Windows Explorer from VBA?
Here is what I did.
Dim strPath As String
strPath = "\\server\Instructions\"
Shell "cmd.exe /c start """" """ & strPath & """", vbNormalFocus
Pros:
- Avoids opening new explorer instances (only sets focus if window exists).
- Relatively simple (does not need to reference win32 libraries).
- Window maximization (or minimization) is not mandatory. Window will open with normal size.
Cons:
- The cmd-window is visible for a short time.
This consistently opens a window to the folder if there is none open and switches to the open window if there is one open to that folder.
Thanks to PhilHibbs and AnorZaken for the basis for this. PhilHibbs comment didn't quite work for me, I needed to the command string to have a pair of double quotes before the folder name. And I preferred having a command prompt window appear for a bit rather than be forced to have the Explorer window maximized or minimized.
JavaScript sleep/wait before continuing
JS does not have a sleep function, it has setTimeout() or setInterval() functions.
If you can move the code that you need to run after the pause into the setTimeout() callback, you can do something like this:
//code before the pause
setTimeout(function(){
//do what you need here
}, 2000);
see example here : http://jsfiddle.net/9LZQp/
This won't halt the execution of your script, but due to the fact that setTimeout() is an asynchronous function, this code
console.log("HELLO");
setTimeout(function(){
console.log("THIS IS");
}, 2000);
console.log("DOG");
will print this in the console:
HELLO
DOG
THIS IS
(note that DOG is printed before THIS IS)
You can use the following code to simulate a sleep for short periods of time:
function sleep(milliseconds) {
var start = new Date().getTime();
for (var i = 0; i < 1e7; i++) {
if ((new Date().getTime() - start) > milliseconds){
break;
}
}
}
now, if you want to sleep for 1 second, just use:
sleep(1000);
example: http://jsfiddle.net/HrJku/1/
please note that this code will keep your script busy for n milliseconds. This will not only stop execution of Javascript on your page, but depending on the browser implementation, may possibly make the page completely unresponsive, and possibly make the entire browser unresponsive. In other words this is almost always the wrong thing to do.
How to get enum value by string or int
There are numerous ways to do this, but if you want a simple example, this will do. It just needs to be enhanced with necessary defensive coding to check for type safety and invalid parsing, etc.
/// <summary>
/// Extension method to return an enum value of type T for the given string.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="value"></param>
/// <returns></returns>
public static T ToEnum<T>(this string value)
{
return (T) Enum.Parse(typeof(T), value, true);
}
/// <summary>
/// Extension method to return an enum value of type T for the given int.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="value"></param>
/// <returns></returns>
public static T ToEnum<T>(this int value)
{
var name = Enum.GetName(typeof(T), value);
return name.ToEnum<T>();
}
Android ListView with different layouts for each row
I know how to create a custom row + custom array adapter to support a custom row for the entire list view. But how can one listview support many different row styles?
You already know the basics. You just need to get your custom adapter to return a different layout/view based on the row/cursor information being provided.
A ListView can support multiple row styles because it derives from AdapterView:
An AdapterView is a view whose children are determined by an Adapter.
If you look at the Adapter, you'll see methods that account for using row-specific views:
abstract int getViewTypeCount()
// Returns the number of types of Views that will be created ...
abstract int getItemViewType(int position)
// Get the type of View that will be created ...
abstract View getView(int position, View convertView, ViewGroup parent)
// Get a View that displays the data ...
The latter two methods provide the position so you can use that to determine the type of view you should use for that row.
Of course, you generally don't use AdapterView and Adapter directly, but rather use or derive from one of their subclasses. The subclasses of Adapter may add additional functionality that change how to get custom layouts for different rows. Since the view used for a given row is driven by the adapter, the trick is to get the adapter to return the desired view for a given row. How to do this differs depending on the specific adapter.
For example, to use ArrayAdapter,
- override
getView()to inflate, populate, and return the desired view for the given position. ThegetView()method includes an opportunity reuse views via theconvertViewparameter.
But to use derivatives of CursorAdapter,
- override
newView()to inflate, populate, and return the desired view for the current cursor state (i.e. the current "row") [you also need to overridebindViewso that widget can reuse views]
However, to use SimpleCursorAdapter,
- define a
SimpleCursorAdapter.ViewBinderwith asetViewValue()method to inflate, populate, and return the desired view for a given row (current cursor state) and data "column". The method can define just the "special" views and defer to SimpleCursorAdapter's standard behavior for the "normal" bindings.
Look up the specific examples/tutorials for the kind of adapter you end up using.
How can I make visible an invisible control with jquery? (hide and show not work)
It's been more than 10 years and not sure if anyone still finding this question or answer relevant.
But a quick workaround is just to wrap the asp control within a html container
<div id="myElement" style="display: inline-block">
<asp:TextBox ID="textBox1" runat="server"></asp:TextBox>
</div>
Whenever the Javascript Event is triggered, if it needs to be an event by the asp control, just wrap the asp control around the div container.
<div id="testG">
<asp:Button ID="Button2" runat="server" CssClass="btn" Text="Activate" />
</div>
The jQuery Code is below:
$(document).ready(function () {
$("#testG").click(function () {
$("#myElement").css("display", "none");
});
});
Display rows with one or more NaN values in pandas dataframe
Use df[df.isnull().any(axis=1)] for python 3.6 or above.
Allowing Untrusted SSL Certificates with HttpClient
Or you can use for the HttpClient in the Windows.Web.Http namespace:
var filter = new HttpBaseProtocolFilter();
#if DEBUG
filter.IgnorableServerCertificateErrors.Add(ChainValidationResult.Expired);
filter.IgnorableServerCertificateErrors.Add(ChainValidationResult.Untrusted);
filter.IgnorableServerCertificateErrors.Add(ChainValidationResult.InvalidName);
#endif
using (var httpClient = new HttpClient(filter)) {
...
}
Custom checkbox image android
If you are using custom adapters than android:focusable="false" and android:focusableInTouchMode="false" are nessesury to make list items clickable while using checkbox.
<CheckBox
android:id="@+id/checkbox_fav"
android:focusable="false"
android:focusableInTouchMode="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:button="@drawable/checkbox_layout"/>
In drawable>checkbox_layout.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:drawable="@drawable/uncked_checkbox"
android:state_checked="false"/>
<item android:drawable="@drawable/selected_checkbox"
android:state_checked="true"/>
<item android:drawable="@drawable/uncked_checkbox"/>
</selector>
Add string in a certain position in Python
If you want many inserts
from rope.base.codeanalyze import ChangeCollector
c = ChangeCollector(code)
c.add_change(5, 5, '<span style="background-color:#339999;">')
c.add_change(10, 10, '</span>')
rend_code = c.get_changed()
How can I change the color of my prompt in zsh (different from normal text)?
man zshall and search for PROMPT EXPANSION
After reading the existing answers here, several of them are conflicting. I've tried the various approaches on systems running zsh 4.2 and 5+ and found that the reason these answers are conflicting is that they do not say which version of ZSH they are targeted at. Different versions use different syntax for this and some of them require various autoloads.
So, the best bet is probably to man zshall and search for PROMPT EXPANSION to find out all the rules for your particular installation of zsh. Note in the comments, things like "I use Ubuntu 11.04 or 10.4 or OSX" Are not very meaningful as it's unclear which version of ZSH you are using. Ubuntu 11.04 does not imply a newer version of ZSH than ubuntu 10.04. There may be any number of reasons that an older version was installed. For that matter a newer version of ZSH does not imply which syntax to use without knowing which version of ZSH it is.
Error when trying vagrant up
if "Vagrantfile" already exists in this directory. Remove it before running "vagrant init".
error shows then
1. rm Vagrantfile
2. vagrant init hashicorp/precise64
3. vagrant up
Returning IEnumerable<T> vs. IQueryable<T>
I recently ran into an issue with IEnumerable v. IQueryable. The algorithm being used first performed an IQueryable query to obtain a set of results. These were then passed to a foreach loop, with the items instantiated as an Entity Framework (EF) class. This EF class was then used in the from clause of a Linq to Entity query, causing the result to be IEnumerable.
I'm fairly new to EF and Linq for Entities, so it took a while to figure out what the bottleneck was. Using MiniProfiling, I found the query and then converted all of the individual operations to a single IQueryable Linq for Entities query. The IEnumerable took 15 seconds and the IQueryable took 0.5 seconds to execute. There were three tables involved and, after reading this, I believe that the IEnumerable query was actually forming a three table cross-product and filtering the results.
Try to use IQueryables as a rule-of-thumb and profile your work to make your changes measurable.
How do I call a Django function on button click?
here is a pure-javascript, minimalistic approach. I use JQuery but you can use any library (or even no libraries at all).
<html>
<head>
<title>An example</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>
function call_counter(url, pk) {
window.open(url);
$.get('YOUR_VIEW_HERE/'+pk+'/', function (data) {
alert("counter updated!");
});
}
</script>
</head>
<body>
<button onclick="call_counter('http://www.google.com', 12345);">
I update object 12345
</button>
<button onclick="call_counter('http://www.yahoo.com', 999);">
I update object 999
</button>
</body>
</html>
Alternative approach
Instead of placing the JavaScript code, you can change your link in this way:
<a target="_blank"
class="btn btn-info pull-right"
href="{% url YOUR_VIEW column_3_item.pk %}/?next={{column_3_item.link_for_item|urlencode:''}}">
Check It Out
</a>
and in your views.py:
def YOUR_VIEW_DEF(request, pk):
YOUR_OBJECT.objects.filter(pk=pk).update(views=F('views')+1)
return HttpResponseRedirect(request.GET.get('next')))
Getting the URL of the current page using Selenium WebDriver
Put sleep. It will work. I have tried. The reason is that the page wasn't loaded yet. Check this question to know how to wait for load - Wait for page load in Selenium
Calculate difference in keys contained in two Python dictionaries
If you want a built-in solution for a full comparison with arbitrary dict structures, @Maxx's answer is a good start.
import unittest
test = unittest.TestCase()
test.assertEqual(dictA, dictB)
Splitting String with delimiter
How are you calling split? It works like this:
def values = '1182-2'.split('-')
assert values[0] == '1182'
assert values[1] == '2'
Change icon on click (toggle)
Instead of overwriting the html every time, just toggle the class.
$('#click_advance').click(function() {
$('#display_advance').toggle('1000');
$("i", this).toggleClass("icon-circle-arrow-up icon-circle-arrow-down");
});
How to add a line break in an Android TextView?
very easy : use "\n"
String aString1 = "abcd";
String aString2 = "1234";
mSomeTextView.setText(aString1 + "\n" + aString2);
\n corresponds to ASCII char 0xA, which is 'LF' or line feed
\r corresponds to ASCII char 0xD, which is 'CR' or carriage return
this dates back from the very first typewriters, where you could choose to do only a line feed (and type just a line lower), or a line feed + carriage return (which also moves to the beginning of a line)
on Android / java the \n corresponds to a carriage return + line feed, as you would otherwise just 'overwrite' the same line
Is there a way to only install the mysql client (Linux)?
Maybe try this:
yum -y groupinstall "MYSQL Database Client"
Fastest way to check if a value exists in a list
As stated by others, in can be very slow for large lists. Here are some comparisons of the performances for in, set and bisect. Note the time (in second) is in log scale.
Code for testing:
import random
import bisect
import matplotlib.pyplot as plt
import math
import time
def method_in(a, b, c):
start_time = time.time()
for i, x in enumerate(a):
if x in b:
c[i] = 1
return time.time() - start_time
def method_set_in(a, b, c):
start_time = time.time()
s = set(b)
for i, x in enumerate(a):
if x in s:
c[i] = 1
return time.time() - start_time
def method_bisect(a, b, c):
start_time = time.time()
b.sort()
for i, x in enumerate(a):
index = bisect.bisect_left(b, x)
if index < len(a):
if x == b[index]:
c[i] = 1
return time.time() - start_time
def profile():
time_method_in = []
time_method_set_in = []
time_method_bisect = []
# adjust range down if runtime is to great or up if there are to many zero entries in any of the time_method lists
Nls = [x for x in range(10000, 30000, 1000)]
for N in Nls:
a = [x for x in range(0, N)]
random.shuffle(a)
b = [x for x in range(0, N)]
random.shuffle(b)
c = [0 for x in range(0, N)]
time_method_in.append(method_in(a, b, c))
time_method_set_in.append(method_set_in(a, b, c))
time_method_bisect.append(method_bisect(a, b, c))
plt.plot(Nls, time_method_in, marker='o', color='r', linestyle='-', label='in')
plt.plot(Nls, time_method_set_in, marker='o', color='b', linestyle='-', label='set')
plt.plot(Nls, time_method_bisect, marker='o', color='g', linestyle='-', label='bisect')
plt.xlabel('list size', fontsize=18)
plt.ylabel('log(time)', fontsize=18)
plt.legend(loc='upper left')
plt.yscale('log')
plt.show()
profile()
Valid characters in a Java class name
I'd like to add to bosnic's answer that any valid currency character is legal for an identifier in Java. th€is is a legal identifier, as is €this, and € as well. However, I can't figure out how to edit his or her answer, so I am forced to post this trivial addition.
Highlight text similar to grep, but don't filter out text
Maybe this is an XY problem, and what you are really trying to do is to highlight occurrences of words as they appear in your shell. If so, you may be able to use your terminal emulator for this. For instance, in Konsole, start Find (ctrl+shift+F) and type your word. The word will then be highlighted whenever it occurs in new or existing output until you cancel the function.
Connection refused on docker container
Command EXPOSE in your Dockerfile lets you bind container's port to some port on the host machine but it doesn't do anything else.
When running container, to bind ports specify -p option.
So let's say you expose port 5000. After building the image when you run the container, run docker run -p 5000:5000 name. This binds container's port 5000 to your laptop/computers port 5000 and that portforwarding lets container to receive outside requests.
This should do it.
How to remove illegal characters from path and filenames?
For file names:
var cleanFileName = string.Join("", fileName.Split(Path.GetInvalidFileNameChars()));
For full paths:
var cleanPath = string.Join("", path.Split(Path.GetInvalidPathChars()));
Note that if you intend to use this as a security feature, a more robust approach would be to expand all paths and then verify that the user supplied path is indeed a child of a directory the user should have access to.
Java and SQLite
David Crawshaw project(sqlitejdbc-v056.jar) seems out of date and last update was Jun 20, 2009, source here
I would recomend Xerials fork of Crawshaw sqlite wrapper. I replaced sqlitejdbc-v056.jar with Xerials sqlite-jdbc-3.7.2.jar file without any problem.
Uses same syntax as in Bernie's answer and is much faster and with latest sqlite library.
What is different from Zentus's SQLite JDBC?
The original Zentus's SQLite JDBC driver http://www.zentus.com/sqlitejdbc/ itself is an excellent utility for using SQLite databases from Java language, and our SQLiteJDBC library also relies on its implementation. However, its pure-java version, which totally translates c/c++ codes of SQLite into Java, is significantly slower compared to its native version, which uses SQLite binaries compiled for each OS (win, mac, linux).
To use the native version of sqlite-jdbc, user had to set a path to the native codes (dll, jnilib, so files, which are JNDI C programs) by using command-line arguments, e.g., -Djava.library.path=(path to the dll, jnilib, etc.), or -Dorg.sqlite.lib.path, etc. This process was error-prone and bothersome to tell every user to set these variables. Our SQLiteJDBC library completely does away these inconveniences.
Another difference is that we are keeping this SQLiteJDBC libray up-to-date to the newest version of SQLite engine, because we are one of the hottest users of this library. For example, SQLite JDBC is a core component of UTGB (University of Tokyo Genome Browser) Toolkit, which is our utility to create personalized genome browsers.
EDIT : As usual when you update something, there will be problems in some obscure place in your code(happened to me). Test test test =)
Conversion failed when converting from a character string to uniqueidentifier
this fails:
DECLARE @vPortalUID NVARCHAR(32)
SET @vPortalUID='2A66057D-F4E5-4E2B-B2F1-38C51A96D385'
DECLARE @nPortalUID AS UNIQUEIDENTIFIER
SET @nPortalUID = CAST(@vPortalUID AS uniqueidentifier)
PRINT @nPortalUID
this works
DECLARE @vPortalUID NVARCHAR(36)
SET @vPortalUID='2A66057D-F4E5-4E2B-B2F1-38C51A96D385'
DECLARE @nPortalUID AS UNIQUEIDENTIFIER
SET @nPortalUID = CAST(@vPortalUID AS UNIQUEIDENTIFIER)
PRINT @nPortalUID
the difference is NVARCHAR(36), your input parameter is too small!
Should I return EXIT_SUCCESS or 0 from main()?
0 is, by definition, a magic number. EXIT_SUCCESS is almost universally equal to 0, happily enough. So why not just return/exit 0?
exit(EXIT_SUCCESS); is abundantly clear in meaning.
exit(0); on the other hand, is counterintuitive in some ways. Someone not familiar with shell behavior might assume that 0 == false == bad, just like every other usage of 0 in C. But no - in this one special case, 0 == success == good. For most experienced devs, not going to be a problem. But why trip up the new guy for absolutely no reason?
tl;dr - if there's a defined constant for your magic number, there's almost never a reason not to used the constant in the first place. It's more searchable, often clearer, etc. and it doesn't cost you anything.
VBScript - How to make program wait until process has finished?
Probably something like this? (UNTESTED)
Sub Sample()
Dim strWB4, strMyMacro
strMyMacro = "Sheet1.my_macro_name"
'
'~~> Rest of Code
'
'loop through the folder and get the file names
For Each Fil In FLD.Files
Set x4WB = x1.Workbooks.Open(Fil)
x4WB.Application.Visible = True
x1.Run strMyMacro
x4WB.Close
Do Until IsWorkBookOpen(Fil) = False
DoEvents
Loop
Next
'
'~~> Rest of Code
'
End Sub
'~~> Function to check if the file is open
Function IsWorkBookOpen(FileName As String)
Dim ff As Long, ErrNo As Long
On Error Resume Next
ff = FreeFile()
Open FileName For Input Lock Read As #ff
Close ff
ErrNo = Err
On Error GoTo 0
Select Case ErrNo
Case 0: IsWorkBookOpen = False
Case 70: IsWorkBookOpen = True
Case Else: Error ErrNo
End Select
End Function
How would you count occurrences of a string (actually a char) within a string?
If you want to be able to search for whole strings, and not just characters:
src.Select((c, i) => src.Substring(i))
.Count(sub => sub.StartsWith(target))
Read as "for each character in the string, take the rest of the string starting from that character as a substring; count it if it starts with the target string."
Apache Tomcat Not Showing in Eclipse Server Runtime Environments
In my case I needed to install "JST Server Adapters". I am running Eclipse 3.6 Helios RCP Edition.
Here are the steps I followed:
- Help -> Install New Software
- Choose "Helios - http://download.eclipse.org/releases/helios" site or kepler - http://download.ecliplse.org/releases/kepler
- Expand "Web, XML, and Java EE Development"
- Check JST Server Adapters (version 3.2.2)
After that I could define new Server Runtime Environments.
EDIT: With Eclipse 3.7 Indigo Classic, Eclipse Kepler and Luna, the steps are the same (with appropriate update site) but you need both JST Server Adapters and JST Server Adapters Extentions to get the Server Runtime Environment options.
call javascript function on hyperlink click
The JQuery answer. Since JavaScript was invented in order to develop JQuery, I am giving you an example in JQuery doing this:
<div class="menu">
<a href="http://example.org">Example</a>
<a href="http://foobar.com">Foobar.com</a>
</div>
<script>
jQuery( 'div.menu a' )
.click(function() {
do_the_click( this.href );
return false;
});
// play the funky music white boy
function do_the_click( url )
{
alert( url );
}
</script>