How to make sure docker's time syncs with that of the host?
The source for this answer is the comment to the answer at: Will docker container auto sync time with the host machine?
After looking at the answer, I realized that there is no way a clock drift will occur on the docker container. Docker uses the same clock as the host and the docker cannot change it. It means that doing an ntpdate inside the docker does not work.
The correct thing to do is to update the host time using ntpdate
As far as syncing timezones is concerned, -v /etc/localtime:/etc/localtime:ro works.
How to check if a textbox is empty using javascript
Canonical without using frameworks with added trim prototype for older browsers
<html>
<head>
<script type="text/javascript">
// add trim to older IEs
if (!String.trim) {
String.prototype.trim = function() {return this.replace(/^\s+|\s+$/g, "");};
}
window.onload=function() { // onobtrusively adding the submit handler
document.getElementById("form1").onsubmit=function() { // needs an ID
var val = this.textField1.value; // 'this' is the form
if (val==null || val.trim()=="") {
alert('Please enter something');
this.textField1.focus();
return false; // cancel submission
}
return true; // allow submit
}
}
</script>
</head>
<body>
<form id="form1">
<input type="text" name="textField1" value="" /><br/>
<input type="submit" />
</form>
</body>
</html>
Here is the inline version, although not recommended I show it here in case you need to add validation without being able to refactor the code
function validate(theForm) { // passing the form object
var val = theForm.textField1.value;
if (val==null || val.trim()=="") {
alert('Please enter something');
theForm.textField1.focus();
return false; // cancel submission
}
return true; // allow submit
}
passing the form object in (this)
<form onsubmit="return validate(this)">
<input type="text" name="textField1" value="" /><br/>
<input type="submit" />
</form>
Load a UIView from nib in Swift
All you have to do is call init method in your UIView class.
Do it that way:
class className: UIView {
@IBOutlet var view: UIView!
override init(frame: CGRect) {
super.init(frame: frame)
setup()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)!
}
func setup() {
UINib(nibName: "nib", bundle: nil).instantiateWithOwner(self, options: nil)
addSubview(view)
view.frame = self.bounds
}
}
Now, if you want to add this view as a sub view in view controller, do it that way in view controller.swift file:
self.view.addSubview(className())
Android Log.v(), Log.d(), Log.i(), Log.w(), Log.e() - When to use each one?
The Android Studio website has recently (I think) provided some advice what kind of messages to expect from different log levels that may be useful along with Kurtis' answer:
- Verbose - Show all log messages (the default).
- Debug - Show debug log messages that are useful during development only, as well as the message levels lower in this list.
- Info - Show expected log messages for regular usage, as well as the message levels lower in this list.
- Warn - Show possible issues that are not yet errors, as well as the message levels lower in this list.
- Error - Show issues that have caused errors, as well as the message level lower in this list.
- Assert - Show issues that the developer expects should never happen.
How to convert a data frame column to numeric type?
with hablar::convert
To easily convert multiple columns to different data types you can use hablar::convert. Simple syntax: df %>% convert(num(a)) converts the column a from df to numeric.
Detailed example
Lets convert all columns of mtcars to character.
df <- mtcars %>% mutate_all(as.character) %>% as_tibble()
> df
# A tibble: 32 x 11
mpg cyl disp hp drat wt qsec vs am gear carb
<chr> <chr> <chr> <chr> <chr> <chr> <chr> <chr> <chr> <chr> <chr>
1 21 6 160 110 3.9 2.62 16.46 0 1 4 4
2 21 6 160 110 3.9 2.875 17.02 0 1 4 4
3 22.8 4 108 93 3.85 2.32 18.61 1 1 4 1
With hablar::convert:
library(hablar)
# Convert columns to integer, numeric and factor
df %>%
convert(int(cyl, vs),
num(disp:wt),
fct(gear))
results in:
# A tibble: 32 x 11
mpg cyl disp hp drat wt qsec vs am gear carb
<chr> <int> <dbl> <dbl> <dbl> <dbl> <chr> <int> <chr> <fct> <chr>
1 21 6 160 110 3.9 2.62 16.46 0 1 4 4
2 21 6 160 110 3.9 2.88 17.02 0 1 4 4
3 22.8 4 108 93 3.85 2.32 18.61 1 1 4 1
4 21.4 6 258 110 3.08 3.22 19.44 1 0 3 1
Bat file to run a .exe at the command prompt
As described here, about the Start command, the following would start your application with the parameters you've specified:
start "svcutil" "svcutil.exe" "language:cs" "out:generatedProxy.cs" "config:app.config" "http://localhost:8000/ServiceModelSamples/service"
"svcutil", after thestartcommand, is the name given to the CMD window upon running the application specified. This is a required parameter of thestartcommand."svcutil.exe"is the absolute or relative path to the application you want to run. Using quotation marks allows you to have spaces in the path.After the application to start has been specified, all the following parameters are interpreted as arguments sent to the application.
SHOW PROCESSLIST in MySQL command: sleep
It's not a query waiting for connection; it's a connection pointer waiting for the timeout to terminate.
It doesn't have an impact on performance. The only thing it's using is a few bytes as every connection does.
The really worst case: It's using one connection of your pool; If you would connect multiple times via console client and just close the client without closing the connection, you could use up all your connections and have to wait for the timeout to be able to connect again... but this is highly unlikely :-)
See MySql Proccesslist filled with "Sleep" Entries leading to "Too many Connections"? and https://dba.stackexchange.com/questions/1558/how-long-is-too-long-for-mysql-connections-to-sleep for more information.
PDO support for multiple queries (PDO_MYSQL, PDO_MYSQLND)
After half a day of fiddling with this, found out that PDO had a bug where...
--
//This would run as expected:
$pdo->exec("valid-stmt1; valid-stmt2;");
--
//This would error out, as expected:
$pdo->exec("non-sense; valid-stmt1;");
--
//Here is the bug:
$pdo->exec("valid-stmt1; non-sense; valid-stmt3;");
It would execute the "valid-stmt1;", stop on "non-sense;" and never throw an error. Will not run the "valid-stmt3;", return true and lie that everything ran good.
I would expect it to error out on the "non-sense;" but it doesn't.
Here is where I found this info: Invalid PDO query does not return an error
Here is the bug: https://bugs.php.net/bug.php?id=61613
So, I tried doing this with mysqli and haven't really found any solid answer on how it works so I thought I's just leave it here for those who want to use it..
try{
// db connection
$mysqli = new mysqli("host", "user" , "password", "database");
if($mysqli->connect_errno){
throw new Exception("Connection Failed: [".$mysqli->connect_errno. "] : ".$mysqli->connect_error );
exit();
}
// read file.
// This file has multiple sql statements.
$file_sql = file_get_contents("filename.sql");
if($file_sql == "null" || empty($file_sql) || strlen($file_sql) <= 0){
throw new Exception("File is empty. I wont run it..");
}
//run the sql file contents through the mysqli's multi_query function.
// here is where it gets complicated...
// if the first query has errors, here is where you get it.
$sqlFileResult = $mysqli->multi_query($file_sql);
// this returns false only if there are errros on first sql statement, it doesn't care about the rest of the sql statements.
$sqlCount = 1;
if( $sqlFileResult == false ){
throw new Exception("File: '".$fullpath."' , Query#[".$sqlCount."], [".$mysqli->errno."]: '".$mysqli->error."' }");
}
// so handle the errors on the subsequent statements like this.
// while I have more results. This will start from the second sql statement. The first statement errors are thrown above on the $mysqli->multi_query("SQL"); line
while($mysqli->more_results()){
$sqlCount++;
// load the next result set into mysqli's active buffer. if this fails the $mysqli->error, $mysqli->errno will have appropriate error info.
if($mysqli->next_result() == false){
throw new Exception("File: '".$fullpath."' , Query#[".$sqlCount."], Error No: [".$mysqli->errno."]: '".$mysqli->error."' }");
}
}
}
catch(Exception $e){
echo $e->getMessage(). " <pre>".$e->getTraceAsString()."</pre>";
}
Add bottom line to view in SwiftUI / Swift / Objective-C / Xamarin
Here is swift3 code with @IBInspectable
create a new file Cocoa Touch Class Swift File
import UIKit
extension UIView {
@IBInspectable var cornerRadius: CGFloat {
get {
return layer.cornerRadius
}
set {
layer.cornerRadius = newValue
layer.masksToBounds = newValue > 0
}
}
@IBInspectable var borderWidth: CGFloat {
get {
return layer.borderWidth
}
set {
layer.borderWidth = newValue
}
}
@IBInspectable var borderColor: UIColor? {
get {
return UIColor(cgColor: layer.borderColor!)
}
set {
layer.borderColor = newValue?.cgColor
}
}
@IBInspectable var leftBorderWidth: CGFloat {
get {
return 0.0 // Just to satisfy property
}
set {
let line = UIView(frame: CGRect(x: 0.0, y: 0.0, width: newValue, height: bounds.height))
line.translatesAutoresizingMaskIntoConstraints = false
line.backgroundColor = UIColor(cgColor: layer.borderColor!)
line.tag = 110
self.addSubview(line)
let views = ["line": line]
let metrics = ["lineWidth": newValue]
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|[line(==lineWidth)]", options: [], metrics: metrics, views: views))
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[line]|", options: [], metrics: nil, views: views))
}
}
@IBInspectable var topBorderWidth: CGFloat {
get {
return 0.0 // Just to satisfy property
}
set {
let line = UIView(frame: CGRect(x: 0.0, y: 0.0, width: bounds.width, height: newValue))
line.translatesAutoresizingMaskIntoConstraints = false
line.backgroundColor = borderColor
line.tag = 110
self.addSubview(line)
let views = ["line": line]
let metrics = ["lineWidth": newValue]
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|[line]|", options: [], metrics: nil, views: views))
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[line(==lineWidth)]", options: [], metrics: metrics, views: views))
}
}
@IBInspectable var rightBorderWidth: CGFloat {
get {
return 0.0 // Just to satisfy property
}
set {
let line = UIView(frame: CGRect(x: bounds.width, y: 0.0, width: newValue, height: bounds.height))
line.translatesAutoresizingMaskIntoConstraints = false
line.backgroundColor = borderColor
line.tag = 110
self.addSubview(line)
let views = ["line": line]
let metrics = ["lineWidth": newValue]
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "[line(==lineWidth)]|", options: [], metrics: metrics, views: views))
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[line]|", options: [], metrics: nil, views: views))
}
}
@IBInspectable var bottomBorderWidth: CGFloat {
get {
return 0.0 // Just to satisfy property
}
set {
let line = UIView(frame: CGRect(x: 0.0, y: bounds.height, width: bounds.width, height: newValue))
line.translatesAutoresizingMaskIntoConstraints = false
line.backgroundColor = borderColor
line.tag = 110
self.addSubview(line)
let views = ["line": line]
let metrics = ["lineWidth": newValue]
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|[line]|", options: [], metrics: nil, views: views))
addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:[line(==lineWidth)]|", options: [], metrics: metrics, views: views))
}
}
func removeborder() {
for view in self.subviews {
if view.tag == 110 {
view.removeFromSuperview()
}
}
}
}
and replace the file with the below code and you will get the option in storyboard attribute inspector like this
Enjoy :)
How to log a method's execution time exactly in milliseconds?
Here's a Swift 3 solution for bisecting code anywhere to find a long running process.
var increment: Int = 0
var incrementTime = NSDate()
struct Instrumentation {
var title: String
var point: Int
var elapsedTime: Double
init(_ title: String, _ point: Int, _ elapsedTime: Double) {
self.title = title
self.point = point
self.elapsedTime = elapsedTime
}
}
var elapsedTimes = [Instrumentation]()
func instrument(_ title: String) {
increment += 1
let incrementedTime = -incrementTime.timeIntervalSinceNow
let newPoint = Instrumentation(title, increment, incrementedTime)
elapsedTimes.append(newPoint)
incrementTime = NSDate()
}
Usage: -
instrument("View Did Appear")
print("ELAPSED TIMES \(elapsedTimes)")
Sample output:-
ELAPSED TIMES [MyApp.SomeViewController.Instrumentation(title: "Start View Did Load", point: 1, elapsedTime: 0.040504038333892822), MyApp.SomeViewController.Instrumentation(title: "Finished Adding SubViews", point: 2, elapsedTime: 0.010585010051727295), MyApp.SomeViewController.Instrumentation(title: "View Did Appear", point: 3, elapsedTime: 0.56564098596572876)]
Android how to use Environment.getExternalStorageDirectory()
To get the directory, you can use the code below:
File cacheDir = new File(Environment.getExternalStorageDirectory() + File.separator + "");
How to find MAC address of an Android device programmatically
There is a simple way:
Android:
String macAddress =
android.provider.Settings.Secure.getString(this.getApplicationContext().getContentResolver(), "android_id");
Xamarin:
Settings.Secure.GetString(this.ContentResolver, "android_id");
Check if string has space in between (or anywhere)
If indeed the goal is to see if a string contains the actual space character (as described in the title), as opposed to any other sort of whitespace characters, you can use:
string s = "Hello There";
bool fHasSpace = s.Contains(" ");
If you're looking for ways to detect whitespace, there's several great options below.
In SQL Server, how do I generate a CREATE TABLE statement for a given table?
There is a Powershell script buried in the msdb forums that will script all the tables and related objects:
# Script all tables in a database
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.SMO")
| out-null
$s = new-object ('Microsoft.SqlServer.Management.Smo.Server') '<Servername>'
$db = $s.Databases['<Database>']
$scrp = new-object ('Microsoft.SqlServer.Management.Smo.Scripter') ($s)
$scrp.Options.AppendToFile = $True
$scrp.Options.ClusteredIndexes = $True
$scrp.Options.DriAll = $True
$scrp.Options.ScriptDrops = $False
$scrp.Options.IncludeHeaders = $False
$scrp.Options.ToFileOnly = $True
$scrp.Options.Indexes = $True
$scrp.Options.WithDependencies = $True
$scrp.Options.FileName = 'C:\Temp\<Database>.SQL'
foreach($item in $db.Tables) { $tablearray+=@($item) }
$scrp.Script($tablearray)
Write-Host "Scripting complete"
CKEditor instance already exists
Try this:
for (name in CKEDITOR.instances)
{
CKEDITOR.instances[name].destroy(true);
}
Official reasons for "Software caused connection abort: socket write error"
The java.net.SocketException is thrown when there is an error creating or accessing a socket (such as TCP). This usually can be caused when the server has terminated the connection (without properly closing it), so before getting the full response. In most cases this can be caused either by the timeout issue (e.g. the response takes too much time or server is overloaded with the requests), or the client sent the SYN, but it didn't receive ACK (acknowledgment of the connection termination). For timeout issues, you can consider increasing the timeout value.
The Socket Exception usually comes with the specified detail message about the issue.
Example of detailed messages:
Software caused connection abort: recv failed.
The error indicates an attempt to send the message and the connection has been aborted by your server. If this happened while connecting to the database, this can be related to using not compatible Connector/J JDBC driver.
Possible solution: Make sure you've proper libraries/drivers in your CLASSPATH.
Software caused connection abort: connect.
This can happen when there is a problem to connect to the remote. For example due to virus-checker rejecting the remote mail requests.
Possible solution: Check Virus scan service whether it's blocking the port for the outgoing requests for connections.
Software caused connection abort: socket write error.
Possible solution: Make sure you're writing the correct length of bytes to the stream. So double check what you're sending. See this thread.
Connection reset by peer: socket write error / Connection aborted by peer: socket write error
The application did not check whether keep-alive connection had been timed out on the server side.
Possible solution: Ensure that the HttpClient is non-null before reading from the connection.E13222_01
Connection reset by peer.
The connection has been terminated by the peer (server).
Connection reset.
The connection has been either terminated by the client or closed by the server end of the connection due to request with the request.
See: What's causing my java.net.SocketException: Connection reset?
Why is an OPTIONS request sent and can I disable it?
It can be solved in case of use of a proxy that intercept the request and write the appropriate headers. In the particular case of Varnish these would be the rules:
if (req.http.host == "CUSTOM_URL" ) {
set resp.http.Access-Control-Allow-Origin = "*";
if (req.method == "OPTIONS") {
set resp.http.Access-Control-Max-Age = "1728000";
set resp.http.Access-Control-Allow-Methods = "GET, POST, PUT, DELETE, PATCH, OPTIONS";
set resp.http.Access-Control-Allow-Headers = "Authorization,Content-Type,Accept,Origin,User-Agent,DNT,Cache-Control,X-Mx-ReqToken,Keep-Alive,X-Requested-With,If-Modified-Since";
set resp.http.Content-Length = "0";
set resp.http.Content-Type = "text/plain charset=UTF-8";
set resp.status = 204;
}
}
Fix height of a table row in HTML Table
This works, as long as you remove the height attribute from the table.
<table id="content" border="0px" cellspacing="0px" cellpadding="0px">
<tr><td height='9px' bgcolor="#990000">Upper</td></tr>
<tr><td height='100px' bgcolor="#990099">Lower</td></tr>
</table>
Using DataContractSerializer to serialize, but can't deserialize back
Other solution is:
public static T Deserialize<T>(string rawXml)
{
using (XmlReader reader = XmlReader.Create(new StringReader(rawXml)))
{
DataContractSerializer formatter0 =
new DataContractSerializer(typeof(T));
return (T)formatter0.ReadObject(reader);
}
}
One remark: sometimes it happens that raw xml contains e.g.:
<?xml version="1.0" encoding="utf-16"?>
then of course you can't use UTF8 encoding used in other examples..
How to set <iframe src="..."> without causing `unsafe value` exception?
I ran into this issue as well, but in order to use a safe pipe in my angular module, I installed the safe-pipe npm package, which you can find here. FYI, this worked in Angular 9.1.3, I haven't tried this in any other versions of Angular. Here's how you add it step by step:
Install the package via npm install safe-pipe or yarn add safe-pipe. This will store a reference to it in your dependencies in the package.json file, which you should already have from starting a new Angular project.
Add SafePipeModule module to NgModule.imports in your Angular module file like so:
import { SafePipeModule } from 'safe-pipe'; @NgModule({ imports: [ SafePipeModule ] }) export class AppModule { }Add the safe pipe to an element in the template for the Angular component you are importing into your NgModule this way:
<element [property]="value | safe: sanitizationType"></element>
- Here are some specific examples of the safePipe in an html element:
<div [style.background-image]="'url(' + pictureUrl + ')' | safe: 'style'" class="pic bg-pic"></div>
<img [src]="pictureUrl | safe: 'url'" class="pic" alt="Logo">
<iframe [src]="catVideoEmbed | safe: 'resourceUrl'" width="640" height="390"></iframe>
<pre [innerHTML]="htmlContent | safe: 'html'"></pre>
How do I improve ASP.NET MVC application performance?
1: Get Timings. Until you know where the slowdown is, the question is too broad to answer. A project I'm working on has this precise problem; There's no logging to even know how long certain things take; we can only guess as to the slow parts of the app until we add timings to the project.
2: If you have sequential operations, Don't be afraid to lightly multithread. ESPECIALLY if blocking operations are involved. PLINQ is your friend here.
3: Pregenerate your MVC Views when Publishing... That will help with some of the 'first page hit'
4: Some argue for the stored procedure/ADO advantages of speed. Others argue for speed of development of EF and a more clear seprataion of tiers and their purpose. I've seen really slow designs when SQL and the workarounds to use Sprocs/Views for data retrieval and storage. Also, your difficulty to test goes up. Our current codebase that we are converting from ADO to EF is not performing any worse (and in some cases better) than the old Hand-Rolled model.
5: That said, Think about application Warmup. Part of what we do to help eliminate most of our EF performance woes was to add a special warmup method. It doesn't precompile any queries or anything, but it helps with much of the metadata loading/generation. This can be even more important when dealing with Code First models.
6: As others have said, Don't use Session state or ViewState if possible. They are not necessarily performance optimizations that developers think about, but once you start writing more complex web applications, you want responsiveness. Session state precludes this. Imagine a long running query. You decide to open a new window and try a less complex one. Well, you may as well have waited with session state on, because the server will wait until the first request is done before moving to the next one for that session.
7: Minimize round trips to the database. Save stuff that you frequently use but will not realistically change to your .Net Cache. Try to batch your inserts/updates where possible.
7.1: Avoid Data Access code in your Razor views without a damn good reason. I wouldn't be saying this if I hadn't seen it. They were already accessing their data when putting the model together, why the hell weren't they including it in the model?
PHP: How to check if a date is today, yesterday or tomorrow
Pass the date into the function.
<?php
function getTheDay($date)
{
$curr_date=strtotime(date("Y-m-d H:i:s"));
$the_date=strtotime($date);
$diff=floor(($curr_date-$the_date)/(60*60*24));
switch($diff)
{
case 0:
return "Today";
break;
case 1:
return "Yesterday";
break;
default:
return $diff." Days ago";
}
}
?>
How to add facebook share button on my website?
This Facebook page has a simple tool to create various share buttons.
For example, this is some output I got:
<div id="fb-root"></div>
<script async defer crossorigin="anonymous" src="https://connect.facebook.net/en_US/sdk.js#xfbml=1&version=v8.0" nonce="dilSYGI6"></script>
<div class="fb-share-button" data-href="https://www.mocacleveland.org/exhibitions/lee-mingwei-you-are-not-stranger" data-layout="button" data-size="small">
<a target="_blank" href="https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.mocacleveland.org%2Fexhibitions%2Flee-mingwei-you-are-not-stranger&src=sdkpreparse" class="fb-xfbml-parse-ignore">Share</a>
</div>
Modify XML existing content in C#
The XmlTextWriter is usually used for generating (not updating) XML content. When you load the xml file into an XmlDocument, you don't need a separate writer.
Just update the node you have selected and .Save() that XmlDocument.
jQuery Validate Plugin - How to create a simple custom rule?
Thanks, it worked!
Here's the final code:
$.validator.addMethod("greaterThanZero", function(value, element) {
var the_list_array = $("#some_form .super_item:checked");
return the_list_array.length > 0;
}, "* Please check at least one check box");
Command-line Git on Windows
These instructions worked for a Windows 8 with a msysgit/TortoiseGit installation, but should be applicable for other types of git installations on Windows.
- Go to Control Panel\System and Security\System
- Click on Advanced System Settings on the left which opens System Properties.
- Click on the Advanced Tab
- Click on the Environment Variables button at the bottom of the dialog box.
- Edit the System Variable called PATH.
- Append these two paths to the list of existing paths already present in the system variable. The tricky part was two paths were required. These paths may vary for your PC.
;C:\msysgit\bin\;C:\msysgit\mingw\bin\ - Close the CMD prompt window if it is open already. CMD needs to restart to get the updated Path variable.
- Try typing git in the command line, you should see a list of the git commands scroll down the screen.
Java: Local variable mi defined in an enclosing scope must be final or effectively final
The error means you cannot use the local variable mi inside an inner class.
To use a variable inside an inner class you must declare it final. As long as mi is the counter of the loop and final variables cannot be assigned, you must create a workaround to get mi value in a final variable that can be accessed inside inner class:
final Integer innerMi = new Integer(mi);
So your code will be like this:
for (int mi=0; mi<colors.length; mi++){
String pos = Character.toUpperCase(colors[mi].charAt(0)) + colors[mi].substring(1);
JMenuItem Jmi =new JMenuItem(pos);
Jmi.setIcon(new IconA(colors[mi]));
// workaround:
final Integer innerMi = new Integer(mi);
Jmi.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JMenuItem item = (JMenuItem) e.getSource();
IconA icon = (IconA) item.getIcon();
// HERE YOU USE THE FINAL innerMi variable and no errors!!!
Color kolorIkony = getColour(colors[innerMi]);
textArea.setForeground(kolorIkony);
}
});
mnForeground.add(Jmi);
}
}
How to use matplotlib tight layout with Figure?
Just call fig.tight_layout() as you normally would. (pyplot is just a convenience wrapper. In most cases, you only use it to quickly generate figure and axes objects and then call their methods directly.)
There shouldn't be a difference between the QtAgg backend and the default backend (or if there is, it's a bug).
E.g.
import matplotlib.pyplot as plt
#-- In your case, you'd do something more like:
# from matplotlib.figure import Figure
# fig = Figure()
#-- ...but we want to use it interactive for a quick example, so
#-- we'll do it this way
fig, axes = plt.subplots(nrows=4, ncols=4)
for i, ax in enumerate(axes.flat, start=1):
ax.set_title('Test Axes {}'.format(i))
ax.set_xlabel('X axis')
ax.set_ylabel('Y axis')
plt.show()
Before Tight Layout
After Tight Layout
import matplotlib.pyplot as plt
fig, axes = plt.subplots(nrows=4, ncols=4)
for i, ax in enumerate(axes.flat, start=1):
ax.set_title('Test Axes {}'.format(i))
ax.set_xlabel('X axis')
ax.set_ylabel('Y axis')
fig.tight_layout()
plt.show()
Xcode - Warning: Implicit declaration of function is invalid in C99
I have the same warning (it's make my app cannot build). When I add C function in Objective-C's .m file, But forgot to declared it at .h file.
How do I replace text inside a div element?
If you really want us to just continue where you left off, you could do:
if (fieldNameElement)
fieldNameElement.innerHTML = 'some HTML';
JSON: why are forward slashes escaped?
Ugly PHP!
The JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES must be default, not an (strange) option... How to say it to php-developers?
The default MUST be the most frequent use, and the (current) most widely used standards as UTF8. How many PHP-code fragments in the Github or other place need this exoctic "embedded in HTML" feature?
docker build with --build-arg with multiple arguments
It's a shame that we need multiple ARG too, it results in multiple layers and slows down the build because of that, and for anyone also wondering that, currently there is no way to set multiple ARGs.
How do you run your own code alongside Tkinter's event loop?
This is the first working version of what will be a GPS reader and data presenter. tkinter is a very fragile thing with way too few error messages. It does not put stuff up and does not tell why much of the time. Very difficult coming from a good WYSIWYG form developer. Anyway, this runs a small routine 10 times a second and presents the information on a form. Took a while to make it happen. When I tried a timer value of 0, the form never came up. My head now hurts! 10 or more times per second is good enough for me. I hope it helps someone else. Mike Morrow
import tkinter as tk
import time
def GetDateTime():
# Get current date and time in ISO8601
# https://en.wikipedia.org/wiki/ISO_8601
# https://xkcd.com/1179/
return (time.strftime("%Y%m%d", time.gmtime()),
time.strftime("%H%M%S", time.gmtime()),
time.strftime("%Y%m%d", time.localtime()),
time.strftime("%H%M%S", time.localtime()))
class Application(tk.Frame):
def __init__(self, master):
fontsize = 12
textwidth = 9
tk.Frame.__init__(self, master)
self.pack()
tk.Label(self, font=('Helvetica', fontsize), bg = '#be004e', fg = 'white', width = textwidth,
text='Local Time').grid(row=0, column=0)
self.LocalDate = tk.StringVar()
self.LocalDate.set('waiting...')
tk.Label(self, font=('Helvetica', fontsize), bg = '#be004e', fg = 'white', width = textwidth,
textvariable=self.LocalDate).grid(row=0, column=1)
tk.Label(self, font=('Helvetica', fontsize), bg = '#be004e', fg = 'white', width = textwidth,
text='Local Date').grid(row=1, column=0)
self.LocalTime = tk.StringVar()
self.LocalTime.set('waiting...')
tk.Label(self, font=('Helvetica', fontsize), bg = '#be004e', fg = 'white', width = textwidth,
textvariable=self.LocalTime).grid(row=1, column=1)
tk.Label(self, font=('Helvetica', fontsize), bg = '#40CCC0', fg = 'white', width = textwidth,
text='GMT Time').grid(row=2, column=0)
self.nowGdate = tk.StringVar()
self.nowGdate.set('waiting...')
tk.Label(self, font=('Helvetica', fontsize), bg = '#40CCC0', fg = 'white', width = textwidth,
textvariable=self.nowGdate).grid(row=2, column=1)
tk.Label(self, font=('Helvetica', fontsize), bg = '#40CCC0', fg = 'white', width = textwidth,
text='GMT Date').grid(row=3, column=0)
self.nowGtime = tk.StringVar()
self.nowGtime.set('waiting...')
tk.Label(self, font=('Helvetica', fontsize), bg = '#40CCC0', fg = 'white', width = textwidth,
textvariable=self.nowGtime).grid(row=3, column=1)
tk.Button(self, text='Exit', width = 10, bg = '#FF8080', command=root.destroy).grid(row=4, columnspan=2)
self.gettime()
pass
def gettime(self):
gdt, gtm, ldt, ltm = GetDateTime()
gdt = gdt[0:4] + '/' + gdt[4:6] + '/' + gdt[6:8]
gtm = gtm[0:2] + ':' + gtm[2:4] + ':' + gtm[4:6] + ' Z'
ldt = ldt[0:4] + '/' + ldt[4:6] + '/' + ldt[6:8]
ltm = ltm[0:2] + ':' + ltm[2:4] + ':' + ltm[4:6]
self.nowGtime.set(gdt)
self.nowGdate.set(gtm)
self.LocalTime.set(ldt)
self.LocalDate.set(ltm)
self.after(100, self.gettime)
#print (ltm) # Prove it is running this and the external code, too.
pass
root = tk.Tk()
root.wm_title('Temp Converter')
app = Application(master=root)
w = 200 # width for the Tk root
h = 125 # height for the Tk root
# get display screen width and height
ws = root.winfo_screenwidth() # width of the screen
hs = root.winfo_screenheight() # height of the screen
# calculate x and y coordinates for positioning the Tk root window
#centered
#x = (ws/2) - (w/2)
#y = (hs/2) - (h/2)
#right bottom corner (misfires in Win10 putting it too low. OK in Ubuntu)
x = ws - w
y = hs - h - 35 # -35 fixes it, more or less, for Win10
#set the dimensions of the screen and where it is placed
root.geometry('%dx%d+%d+%d' % (w, h, x, y))
root.mainloop()
How to use not contains() in xpath?
I need to select every production with a category that doesn't contain "Business"
Although I upvoted @Arran's answer as correct, I would also add this... Strictly interpreted, the OP's specification would be implemented as
//production[category[not(contains(., 'Business'))]]
rather than
//production[not(contains(category, 'Business'))]
The latter selects every production whose first category child doesn't contain "Business". The two XPath expressions will behave differently when a production has no category children, or more than one.
It doesn't make any difference in practice as long as every <production> has exactly one <category> child, as in your short example XML. Whether you can always count on that being true or not, depends on various factors, such as whether you have a schema that enforces that constraint. Personally, I would go for the more robust option, since it doesn't "cost" much... assuming your requirement as stated in the question is really correct (as opposed to e.g. 'select every production that doesn't have a category that contains "Business"').
The Definitive C Book Guide and List
Warning!
This is a list of random books of diverse quality. In the view of some people (with some justification), it is no longer a list of recommended books. Some of the listed books contain blatantly incorrect statements or teach wrong/harmful practices. People who are aware of such books can edit this answer to help improve it. See The C book list has gone haywire. What to do with it?, and also Deleted question audit 2018.
Reference (All Levels)
The C Programming Language (2nd Edition) - Brian W. Kernighan and Dennis M. Ritchie (1988). Still a good, short but complete introduction to C (C90, not C99 or later versions), written by the inventor of C. However, the language has changed and good C style has developed in the last 25 years, and there are parts of the book that show its age.
C: A Reference Manual (5th Edition) - Samuel P. Harbison and Guy R. Steele (2002). An excellent reference book on C, up to and including C99. It is not a tutorial, and probably unfit for beginners. It's great if you need to write a compiler for C, as the authors had to do when they started.
C Pocket Reference (O'Reilly) - Peter Prinz and Ulla Kirch-Prinz (2002).
The comp.lang.c FAQ - Steve Summit. Web site with answers to many questions about C.
Various versions of the C language standards can be found here. There is an online version of the draft C11 standard.
The new C standard - an annotated reference (Free PDF) - Derek M. Jones (2009). The "new standard" referred to is the old C99 standard rather than C11.
Beginner
C Programming: A Modern Approach (2nd Edition) - K. N. King (2008). A good book for learning C.
Programming in C (4th Edition) - Stephen Kochan (2014). A good general introduction and tutorial.
C Primer Plus (5th Edition) - Stephen Prata (2004)
A Book on C - Al Kelley/Ira Pohl (1998).
The C Book (Free Online) - Mike Banahan, Declan Brady, and Mark Doran (1991).
C: How to Program (8th Edition) - Paul Deitel and Harvey M. Deitel (2015). Lots of good tips and best practices for beginners. The index is very good and serves as a decent reference (just not fully comprehensive, and very shallow).
Head First C - David Griffiths and Dawn Griffiths (2012).
Beginning C (5th Edition) - Ivor Horton (2013). Very good explanation of pointers, using lots of small but complete programs.
Sams Teach Yourself C in 21 Days - Bradley L. Jones and Peter Aitken (2002). Very good introductory stuff.
C In Easy Steps (5th Edition) - Mike McGrath (2018). It is a good book for learning and referencing C.
Effective C - Robert C Seacord (2020). A good introduction to modern C, including chapters on dynamic memory allocation, on program structure, and on debugging, testing and analysis. It has some pointers toward probable C2x features.
Intermediate
Modern C — Jens Gustedt (2017 1st Edn; 2020 2nd Edn). Covers C in 5 levels (encounter, acquaintance, cognition, experience, ambition) from beginning C to advanced C. It covers C11 and C17, including threads and atomic access, which few other books do. Not all compilers recognize these features in all environments.
C Interfaces and Implementations - David R. Hanson (1997). Provides information on how to define a boundary between an interface and implementation in C in a generic and reusable fashion. It also demonstrates this principle by applying it to the implementation of common mechanisms and data structures in C, such as lists, sets, exceptions, string manipulation, memory allocators, and more. Basically, Hanson took all the code he'd written as part of building Icon and lcc and pulled out the best bits in a form that other people could reuse for their own projects. It's a model of good C programming using modern design techniques (including Liskov's data abstraction), showing how to organize a big C project as a bunch of useful libraries.
The C Puzzle Book - Alan R. Feuer (1998)
The Standard C Library - P.J. Plauger (1992). It contains the complete source code to an implementation of the C89 standard library, along with extensive discussions about the design and why the code is designed as shown.
21st Century C: C Tips from the New School - Ben Klemens (2012). In addition to the C language, the book explains gdb, valgrind, autotools, and git. The comments on style are found in the last part (Chapter 6 and beyond).
Algorithms in C - Robert Sedgewick (1997). Gives you a real grasp of implementing algorithms in C. Very lucid and clear; will probably make you want to throw away all of your other algorithms books and keep this one.
- Pointers on C - Kenneth Reek (1997).
Problem Solving and Program Design in C (6th Edition) - Jeri R. Hanly and Elliot B. Koffman (2009).
Data Structures - An Advanced Approach Using C - Jeffrey Esakov and Tom Weiss (1989).
C Unleashed - Richard Heathfield, Lawrence Kirby, et al. (2000). Not ideal, but it is worth intermediate programmers practicing problems written in this book. This is a good cookbook-like approach suggested by comp.lang.c contributors.
- Object-oriented Programming with ANSI-C (Free PDF) - Axel-Tobias Schreiner (1993). The code gets a bit convoluted. If you want C++, use C++. It only uses C90, of course.
- Extreme C: Push the limits of what C and you can do - Kamran Amini (2019). This book builds on your existing C knowledge to help you become a more expert C programmer. You will gain insights into algorithm design, functions, and structures, and understand both multi-threading and multi-processing in a POSIX environment.
Expert
Expert C Programming: Deep C Secrets - Peter van der Linden (1994). Lots of interesting information and war stories from the Sun compiler team, but a little dated in places.
Advanced C Programming by Example - John W. Perry (1998).
Advanced Programming in the UNIX Environment - Richard W. Stevens and Stephen A. Rago (2013). Comprehensive description of how to use the Unix APIs from C code, but not so much about the mechanics of C coding.
Uncategorized
Essential C (Free PDF) - Nick Parlante (2003). Note that this describes the C90 language at several points (e.g., in discussing
//comments and placement of variable declarations at arbitrary points in the code), so it should be treated with some caution.C Programming FAQs: Frequently Asked Questions - Steve Summit (1995). This is the book of the web site listed earlier. It doesn't cover C99 or the later standards.
C in a Nutshell - Peter Prinz and Tony Crawford (2005). Excellent book if you need a reference for C99.
Functional C - Pieter Hartel and Henk Muller (1997). Teaches modern practices that are invaluable for low-level programming, with concurrency and modularity in mind.
The Practice of Programming - Brian W. Kernighan and Rob Pike (1999). A very good book to accompany K&R. It uses C++ and Java too.
C Traps and Pitfalls by A. Koenig (1989). Very good, but the C style pre-dates standard C, which makes it less recommendable these days.
Some have argued for the removal of 'Traps and Pitfalls' from this list because it has trapped some people into making mistakes; others continue to argue for its inclusion. Perhaps it should be regarded as an 'expert' book because it requires a moderately extensive knowledge of C to understand what's changed since it was published.
MISRA-C - industry standard published and maintained by the Motor Industry Software Reliability Association. Covers C89 and C99.
Although this isn't a book as such, many programmers recommend reading and implementing as much of it as possible. MISRA-C was originally intended as guidelines for safety-critical applications in particular, but it applies to any area of application where stable, bug-free C code is desired (who doesn't want fewer bugs?). MISRA-C is becoming the de facto standard in the whole embedded industry and is getting increasingly popular even in other programming branches. There are (at least) three publications of the standard (1998, 2004, and the current version from 2012). There is also a MISRA Compliance Guidelines document from 2016, and MISRA C:2012 Amendment 1 — Additional Security Guidelines for MISRA C:2012 (published in April 2016).
Note that some of the strictures in the MISRA rules are not appropriate to every context. For example, directive 4.12 states "Dynamic memory allocation shall not be used". This is appropriate in the embedded systems for which the MISRA rules are designed; it is not appropriate everywhere. (Compilers, for instance, generally use dynamic memory allocation for things like symbol tables, and to do without dynamic memory allocation would be difficult, if not preposterous.)
Archived lists of ACCU-reviewed books on Beginner's C (116 titles) from 2007 and Advanced C (76 titles) from 2008. Most of these don't look to be on the main site anymore, and you can't browse that by subject anyway.
Warnings
There is a list of books and tutorials to be cautious about at the ISO 9899 Wiki, which is not itself formally associated with ISO or the C standard, but contains information about the C standard (though it hails the release of ISO 9899:2011 and does not mention the release of ISO 9899:2018).
Be wary of books written by Herbert Schildt. In particular, you should stay away from C: The Complete Reference (4th Edition, 2000), known in some circles as C: The Complete Nonsense.
Also do not use the book Let Us C (16th Edition, 2017) by Yashwant Kanetkar. Many people view it as an outdated book that teaches Turbo C and has lots of obsolete, misleading and incorrect material. For example, page 137 discusses the expected output from printf("%d %d %d\n", a, ++a, a++) and does not categorize it as undefined behaviour as it should. It also consistently promotes unportable and buggy coding practices, such as using gets, %[\n]s in scanf, storing return value of getchar in a variable of type char or using fflush on stdin.
Learn C The Hard Way (2015) by Zed Shaw. A book with mixed reviews. A critique of this book by Tim Hentenaar:
To summarize my views, which are laid out below, the author presents the material in a greatly oversimplified and misleading way, the whole corpus is a bundled mess, and some of the opinions and analyses he offers are just plain wrong. I've tried to view this book through the eyes of a novice, but unfortunately I am biased by years of experience writing code in C. It's obvious to me that either the author has a flawed understanding of C, or he's deliberately oversimplifying to the point where he's actually misleading the reader (intentionally or otherwise).
"Learn C The Hard Way" is not a book that I could recommend to someone who is both learning to program and learning C. If you're already a competent programmer in some other related language, then it represents an interesting and unusual exposition on C, though I have reservations about parts of the book. Jonathan Leffler
Outdated
- Practical C Programming (3rd Edition) - Steve Oualline (1997)(Beginner)
Other contributors, not necessarily credited in the revision history, include:
Alex Lockwood,
Ben Jackson,
Bubbles,
claws,
coledot,
Dana Robinson,
Daniel Holden,
desbest,
Dervin Thunk,
dwc,
Erci Hou,
Garen,
haziz,
Johan Bezem,
Jonathan Leffler,
Joshua Partogi,
Lucas,
Lundin,
Matt K.,
mossplix,
Matthieu M.,
midor,
Nietzche-jou,
Norman Ramsey,
r3st0r3,
ridthyself,
Robert S. Barnes,
Steve Summit,
Tim Ring,
Tony Bai,
VMAtm
What are the advantages of Sublime Text over Notepad++ and vice-versa?
It's best if you judge on your own,
1) Sublime works on Mac & Linux that may be its plus point, with VI mode that makes things easily searchable for the VI lover(UNIX & Linux).
http://text-editors.findthebest.com/compare/9-45/Notepad-vs-Sublime-Text
This Link is no more working so please watch this video for similar details Video
Initial observation revealed that everything else should work fine and almost similar;(with help of available plugins in notepad++)
Some Variation: Some user find plugins useful for PHP coders on that
http://codelikeapoem.com/2013/01/goodbye-notepad-hellooooo-sublime-text.html
although, there are many plugins for Notepad Plus Plus ..
I am not sure of your requirements, nor I am promoter of either of these editors :)
So, judge on basis of your requirements, this should satisfy you query...
Yes we can add that both are evolving and changing fast..
Error: unmappable character for encoding UTF8 during maven compilation
I too faced a similar issue and my resolution was different. I went to the line of code mentioned and traversed to the character (For SpanishTest.java[31, 81], go to 31st line and 81th character including spaces). I observed an apostrophe in comment which was causing the issue. Though not a mistake, the maven compiler reports issue and in my case it was possible to remove maven's 'illegal' character.. lol.
Is there a command line utility for rendering GitHub flavored Markdown?
Building on this comment I wrote a one-liner to hit the Github Markdown API using curl and jq.
Paste this bash function onto the command line or into your ~/.bash_profile:
mdsee(){
HTMLFILE="$(mktemp -u).html"
cat "$1" | \
jq --slurp --raw-input '{"text": "\(.)", "mode": "markdown"}' | \
curl -s --data @- https://api.github.com/markdown > "$HTMLFILE"
echo $HTMLFILE
open "$HTMLFILE"
}
And then to see the rendered HTML in-browser run:
mdsee readme.md
Replace open "$HTMLFILE" with lynx "$HTMLFILE" if you need a pure terminal solution.
Summing radio input values
Your javascript is executed before the HTML is generated, so it doesn't "see" the ungenerated INPUT elements. For jQuery, you would either stick the Javascript at the end of the HTML or wrap it like this:
<script type="text/javascript"> $(function() { //jQuery trick to say after all the HTML is parsed. $("input[type=radio]").click(function() { var total = 0; $("input[type=radio]:checked").each(function() { total += parseFloat($(this).val()); }); $("#totalSum").val(total); }); }); </script> EDIT: This code works for me
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </head> <body> <strong>Choose a base package:</strong> <input id="item_0" type="radio" name="pkg" value="1942" />Base Package 1 - $1942 <input id="item_1" type="radio" name="pkg" value="2313" />Base Package 2 - $2313 <input id="item_2" type="radio" name="pkg" value="2829" />Base Package 3 - $2829 <strong>Choose an add on:</strong> <input id="item_10" type="radio" name="ext" value="0" />No add-on - +$0 <input id="item_12" type="radio" name="ext" value="2146" />Add-on 1 - (+$2146) <input id="item_13" type="radio" name="ext" value="2455" />Add-on 2 - (+$2455) <input id="item_14" type="radio" name="ext" value="2764" />Add-on 3 - (+$2764) <input id="item_15" type="radio" name="ext" value="3073" />Add-on 4 - (+$3073) <input id="item_16" type="radio" name="ext" value="3382" />Add-on 5 - (+$3382) <input id="item_17" type="radio" name="ext" value="3691" />Add-on 6 - (+$3691) <strong>Your total is:</strong> <input id="totalSum" type="text" name="totalSum" readonly="readonly" size="5" value="" /> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script> <script type="text/javascript"> $("input[type=radio]").click(function() { var total = 0; $("input[type=radio]:checked").each(function() { total += parseFloat($(this).val()); }); $("#totalSum").val(total); }); </script> </body> </html> jQuery Dialog Box
<script type="text/javascript">
// Increase the default animation speed to exaggerate the effect
$.fx.speeds._default = 1000;
$(function() {
$('#dialog1').dialog({
autoOpen: false,
show: 'blind',
hide: 'explode'
});
$('#Wizard1_txtEmailID').click(function() {
$('#dialog1').dialog('open');
return false;
});
$('#Wizard1_txtEmailID').click(function() {
$('#dialog2').dialog('close');
return false;
});
//mouseover
$('#Wizard1_txtPassword').click(function() {
$('#dialog1').dialog('close');
return false;
});
});
/////////////////////////////////////////////////////
<div id="dialog1" title="Email ID">
<p>
(Enter your Email ID here.)
<br />
</p>
</div>
////////////////////////////////////////////////////////
<div id="dialog2" title="Password">
<p>
(Enter your Passowrd here.)
<br />
</p>
</div>
Failed to locate the winutils binary in the hadoop binary path
Set up HADOOP_HOME variable in windows to resolve the problem.
You can find answer in org/apache/hadoop/hadoop-common/2.2.0/hadoop-common-2.2.0-sources.jar!/org/apache/hadoop/util/Shell.java :
IOException from
public static final String getQualifiedBinPath(String executable)
throws IOException {
// construct hadoop bin path to the specified executable
String fullExeName = HADOOP_HOME_DIR + File.separator + "bin"
+ File.separator + executable;
File exeFile = new File(fullExeName);
if (!exeFile.exists()) {
throw new IOException("Could not locate executable " + fullExeName
+ " in the Hadoop binaries.");
}
return exeFile.getCanonicalPath();
}
HADOOP_HOME_DIR from
// first check the Dflag hadoop.home.dir with JVM scope
String home = System.getProperty("hadoop.home.dir");
// fall back to the system/user-global env variable
if (home == null) {
home = System.getenv("HADOOP_HOME");
}
What does the exclamation mark do before the function?
It returns whether the statement can evaluate to false. eg:
!false // true
!true // false
!isValid() // is not valid
You can use it twice to coerce a value to boolean:
!!1 // true
!!0 // false
So, to more directly answer your question:
var myVar = !function(){ return false; }(); // myVar contains true
Edit: It has the side effect of changing the function declaration to a function expression. E.g. the following code is not valid because it is interpreted as a function declaration that is missing the required identifier (or function name):
function () { return false; }(); // syntax error
How to play an android notification sound
It's been a while since your question, but ... Have you tried setting the Audio stream type?
mp.setAudioStreamType(AudioManager.STREAM_NOTIFICATION);
It must be done before prepare.
How to call a php script/function on a html button click
You can also use
$(document).ready(function() {
//some even that will run ajax request - for example click on a button
var uname = $('#username').val();
$.ajax({
type: 'POST',
url: 'func.php', //this should be url to your PHP file
dataType: 'html',
data: {func: 'toptable', user_id: uname},
beforeSend: function() {
$('#right').html('checking');
},
complete: function() {},
success: function(html) {
$('#right').html(html);
}
});
});
And your func.php:
function toptable()
{
echo 'something happens in here';
}
Hope it helps somebody
Close dialog on click (anywhere)
When creating a JQuery Dialog window, JQuery inserts a ui-widget-overlay class. If you bind a click function to that class to close the dialog, it should provide the functionality you are looking for.
Code will be something like this (untested):
$('.ui-widget-overlay').click(function() { $("#dialog").dialog("close"); });
Edit: The following has been tested for Kendo as well:
$('.k-overlay').click(function () {
var popup = $("#dialogId").data("kendoWindow");
if (popup)
popup.close();
});
How can I return NULL from a generic method in C#?
Your other option would be to to add this to the end of your declaration:
where T : class
where T: IList
That way it will allow you to return null.
VBA - Select columns using numbers?
You can use resize like this:
For n = 1 To 5
Columns(n).Resize(, 5).Select
'~~> rest of your code
Next
In any Range Manipulation that you do, always keep at the back of your mind Resize and Offset property.
Bad operand type for unary +: 'str'
You say that if int(splitLine[0]) > int(lastUnix): is causing the trouble, but you don't actually show anything which suggests that.
I think this line is the problem instead:
print 'Pulled', + stock
Do you see why this line could cause that error message? You want either
>>> stock = "AAAA"
>>> print 'Pulled', stock
Pulled AAAA
or
>>> print 'Pulled ' + stock
Pulled AAAA
not
>>> print 'Pulled', + stock
PulledTraceback (most recent call last):
File "<ipython-input-5-7c26bb268609>", line 1, in <module>
print 'Pulled', + stock
TypeError: bad operand type for unary +: 'str'
You're asking Python to apply the + symbol to a string like +23 makes a positive 23, and she's objecting.
iFrame Height Auto (CSS)
This is my PURE CSS solution :)
Add, scrolling yes to your iframe.
<iframe src="your iframe link" width="100%" scrolling="yes" frameborder="0"></iframe>
The trick :)
<style>
html, body, iframe { height: 100%; }
html { overflow: hidden; }
</style>
You don't need to worry about responsiveness :)
Exception of type 'System.OutOfMemoryException' was thrown.
If you're using IIS Express, select Show All Application from IIS Express in the task bar notification area, then select Stop All.
Now re-run your application.
How to label each equation in align environment?
You can label each line separately, in your case:
\begin{align}
\lambda_i + \mu_i = 0 \label{eq:1}\\
\mu_i \xi_i = 0 \label{eq:2}\\
\lambda_i [y_i( w^T x_i + b) - 1 + \xi_i] = 0 \label{eq:3}
\end{align}
Note that this only works for AMS environments that are designed for multiple equations (as opposed to multiline single equations).
TypeScript: correct way to do string equality?
If you know x and y are both strings, using === is not strictly necessary, but is still good practice.
Assuming both variables actually are strings, both operators will function identically. However, TS often allows you to pass an object that meets all the requirements of string rather than an actual string, which may complicate things.
Given the possibility of confusion or changes in the future, your linter is probably correct in demanding ===. Just go with that.
How to set width of a div in percent in JavaScript?
Also you can use .prop() and it should be better because
Since jQuery 1.6, these properties can no longer be set with the .attr() method. They do not have corresponding attributes and are only properties.
$(elem).prop('width', '100%');
$(elem).prop('height', '100%');
How to change the DataTable Column Name?
dtTempColumn.Columns["EXCELCOLUMNS"].ColumnName = "COLUMN_NAME";
dtTempColumn.AcceptChanges();
How to remove not null constraint in sql server using query
ALTER TABLE YourTable ALTER COLUMN YourColumn columnType NULL
com.microsoft.sqlserver.jdbc.SQLServerDriver not found error
You dont need both jTDS and JDBC in your classpath. Any one is required. Here you need only sqljdbc.jar.
Also, I would suggest to place sqljdbc.jar at physical location to /WEB-INF/lib directory of your project rather than adding it in the Classpath via IDE. Then Tomcat takes care the rest. And also try restarting Tomcat.
You can download Jar from : www.java2s.com/Code/JarDownload/sqlserverjdbc/sqlserverjdbc.jar.zip
EDIT:
As you are supplying Username and Password when connecting,
You need only jdbc:sqlserver://localhost:1433;databaseName=test, Skip integratedSecurity attribute.
change Oracle user account status from EXPIRE(GRACE) to OPEN
Step-1 Need to find user details by using below query
SQL> select username, account_status from dba_users where username='BOB';
USERNAME ACCOUNT_STATUS
------------------------------ --------------------------------
BOB EXPIRED
Step-2 Get users password by using below query.
SQL>SELECT 'ALTER USER '|| name ||' IDENTIFIED BY VALUES '''|| spare4 ||';'|| password ||''';' FROM sys.user$ WHERE name='BOB';
ALTER USER BOB IDENTIFIED BY VALUES 'S:9BDD17811E21EFEDFB1403AAB1DD86AB481E;T:602E36430C0D8DF7E1E453;2F9933095143F432';
Step -3 Run Above alter query
SQL> ALTER USER BOB IDENTIFIED BY VALUES 'S:9BDD17811E21EFEDFB1403AAB1DD86AB481E;T:602E36430C0D8DF7E1E453;2F9933095143F432';
User altered.
Step-4 :Check users account status
SQL> select username, account_status from dba_users where username='BOB';
USERNAME ACCOUNT_STATUS
------------------------------ --------------------------------
BOB OPEN
List of all index & index columns in SQL Server DB
Since your profile states that you are using .NET you could use Server Managed Objects (SMO) programmatically... otherwise any of the above answers are fantastic.
Windows batch script to unhide files hidden by virus
Try this.
Does not require any options to change.
Does not require any command line activity.
Just run software and you will done the job.
www.vhghorecha.in/unhide-all-files-folders-virus/
Happy Knowledge Sharing
Static Classes In Java
There is a static nested class, this [static nested] class does not need an instance of the enclosing class in order to be instantiated itself.
These classes [static nested ones] can access only the static members of the enclosing class [since it does not have any reference to instances of the enclosing class...]
code sample:
public class Test {
class A { }
static class B { }
public static void main(String[] args) {
/*will fail - compilation error, you need an instance of Test to instantiate A*/
A a = new A();
/*will compile successfully, not instance of Test is needed to instantiate B */
B b = new B();
}
}
How to execute a shell script from C in Linux?
It depends on what you want to do with the script (or any other program you want to run).
If you just want to run the script system is the easiest thing to do, but it does some other stuff too, including running a shell and having it run the command (/bin/sh under most *nix).
If you want to either feed the shell script via its standard input or consume its standard output you can use popen (and pclose) to set up a pipe. This also uses the shell (/bin/sh under most *nix) to run the command.
Both of these are library functions that do a lot under the hood, but if they don't meet your needs (or you just want to experiment and learn) you can also use system calls directly. This also allows you do avoid having the shell (/bin/sh) run your command for you.
The system calls of interest are fork, execve, and waitpid. You may want to use one of the library wrappers around execve (type man 3 exec for a list of them). You may also want to use one of the other wait functions (man 2 wait has them all). Additionally you may be interested in the system calls clone and vfork which are related to fork.
fork duplicates the current program, where the only main difference is that the new process gets 0 returned from the call to fork. The parent process gets the new process's process id (or an error) returned.
execve replaces the current program with a new program (keeping the same process id).
waitpid is used by a parent process to wait on a particular child process to finish.
Having the fork and execve steps separate allows programs to do some setup for the new process before it is created (without messing up itself). These include changing standard input, output, and stderr to be different files than the parent process used, changing the user or group of the process, closing files that the child won't need, changing the session, or changing the environmental variables.
You may also be interested in the pipe and dup2 system calls. pipe creates a pipe (with both an input and an output file descriptor). dup2 duplicates a file descriptor as a specific file descriptor (dup is similar but duplicates a file descriptor to the lowest available file descriptor).
Dataframe to Excel sheet
Or you can do like this:
your_df.to_excel( r'C:\Users\full_path\excel_name.xlsx',
sheet_name= 'your_sheet_name'
)
How to install a Mac application using Terminal
To disable inputting password:
sudo visudo
Then add a new line like below and save then:
# The user can run installer as root without inputting password
yourusername ALL=(root) NOPASSWD: /usr/sbin/installer
Then you run installer without password:
sudo installer -pkg ...
fopen deprecated warning
Well you could add a:
#pragma warning (disable : 4996)
before you use fopen, but have you considered using fopen_s as the warning suggests? It returns an error code allowing you to check the result of the function call.
The problem with just disabling deprecated function warnings is that Microsoft may remove the function in question in a later version of the CRT, breaking your code (as stated below in the comments, this won't happen in this instance with fopen because it's part of the C & C++ ISO standards).
How to change Visual Studio 2012,2013 or 2015 License Key?
The ISO is probably pre-pidded. You'll need to delete the key from the setup files. It should then ask you for a key during installation.
Declare and assign multiple string variables at the same time
You can do it like:
string Camnr, Klantnr, Ordernr, Bonnr, Volgnr;// and so on.
Camnr = Klantnr = Ordernr = Bonnr = Volgnr = string.Empty;
First you have to define the variables and then you can use them.
How to use responsive background image in css3 in bootstrap
The file path 'images/ip-box.png' implies that the css file is at the same level as the images folder.
It's probably more common to have 'images' and 'css' folders at the same level as the 'index.html' file.
If that were the case and the css file were one level down in its respective folder, then the path to ip-box.jpg as specified in the css file would be: '../images/ip-box.png'
SQL Server: Null VS Empty String
NULL values are stored separately in a special bitmap space for all the columns.
If you do not distinguish between NULL and '' in your application, then I would recommend you to store '' in your tables (unless the string column is a foreign key, in which case it would probably be better to prohibit the column from storing empty strings and allow the NULLs, if that is compatible with the logic of your application).
How do you test running time of VBA code?
Sub Macro1()
Dim StartTime As Double
StartTime = Timer
''''''''''''''''''''
'Your Code'
''''''''''''''''''''
MsgBox "RunTime : " & Format((Timer - StartTime) / 86400, "hh:mm:ss")
End Sub
Output:
RunTime : 00:00:02
Anchor links in Angularjs?
$anchorScroll is indeed the answer to this, but there's a much better way to use it in more recent versions of Angular.
Now, $anchorScroll accepts the hash as an optional argument, so you don't have to change $location.hash at all. (documentation)
This is the best solution because it doesn't affect the route at all. I couldn't get any of the other solutions to work because I'm using ngRoute and the route would reload as soon as I set $location.hash(id), before $anchorScroll could do its magic.
Here is how to use it... first, in the directive or controller:
$scope.scrollTo = function (id) {
$anchorScroll(id);
}
and then in the view:
<a href="" ng-click="scrollTo(id)">Text</a>
Also, if you need to account for a fixed navbar (or other UI), you can set the offset for $anchorScroll like this (in the main module's run function):
.run(function ($anchorScroll) {
//this will make anchorScroll scroll to the div minus 50px
$anchorScroll.yOffset = 50;
});
What is the IntelliJ shortcut key to create a javadoc comment?
Shortcut Alt+Enter shows intention actions where you can choose "Add Javadoc".
How to beautify JSON in Python?
From the command-line:
echo '{"one":1,"two":2}' | python -mjson.tool
which outputs:
{
"one": 1,
"two": 2
}
Programmtically, the Python manual describes pretty-printing JSON:
>>> import json
>>> print json.dumps({'4': 5, '6': 7}, sort_keys=True, indent=4)
{
"4": 5,
"6": 7
}
Reading HTTP headers in a Spring REST controller
The error that you get does not seem to be related to the RequestHeader.
And you seem to be confusing Spring REST services with JAX-RS, your method signature should be something like:
@RequestMapping(produces = "application/json", method = RequestMethod.GET, value = "data")
@ResponseBody
public ResponseEntity<Data> getData(@RequestHeader(value="User-Agent") String userAgent, @RequestParam(value = "ID", defaultValue = "") String id) {
// your code goes here
}
And your REST class should have annotations like:
@Controller
@RequestMapping("/rest/")
Regarding the actual question, another way to get HTTP headers is to insert the HttpServletRequest into your method and then get the desired header from there.
Example:
@RequestMapping(produces = "application/json", method = RequestMethod.GET, value = "data")
@ResponseBody
public ResponseEntity<Data> getData(HttpServletRequest request, @RequestParam(value = "ID", defaultValue = "") String id) {
String userAgent = request.getHeader("user-agent");
}
Don't worry about the injection of the HttpServletRequest because Spring does that magic for you ;)
How to use pull to refresh in Swift?
For the pull to refresh i am using
DGElasticPullToRefresh
https://github.com/gontovnik/DGElasticPullToRefresh
Installation
pod 'DGElasticPullToRefresh'
import DGElasticPullToRefresh
and put this function into your swift file and call this funtion from your
override func viewWillAppear(_ animated: Bool)
func Refresher() {
let loadingView = DGElasticPullToRefreshLoadingViewCircle()
loadingView.tintColor = UIColor(red: 255.0/255.0, green: 255.0/255.0, blue: 255.0/255.0, alpha: 1.0)
self.table.dg_addPullToRefreshWithActionHandler({ [weak self] () -> Void in
//Completion block you can perfrom your code here.
print("Stack Overflow")
self?.table.dg_stopLoading()
}, loadingView: loadingView)
self.table.dg_setPullToRefreshFillColor(UIColor(red: 255.0/255.0, green: 57.0/255.0, blue: 66.0/255.0, alpha: 1))
self.table.dg_setPullToRefreshBackgroundColor(self.table.backgroundColor!)
}
And dont forget to remove reference while view will get dissapear
to remove pull to refresh put this code in to your
override func viewDidDisappear(_ animated: Bool)
override func viewDidDisappear(_ animated: Bool) {
table.dg_removePullToRefresh()
}
And it will looks like
Happy coding :)
Place input box at the center of div
#the_div input {
margin: 0 auto;
}
I'm not sure if this works in good ol' IE6, so you might have to do this instead.
/* IE 6 (probably) */
#the_div {
text-align: center;
}
How to fill color in a cell in VBA?
- Select all cells by left-top corner
- Choose [Home] >> [Conditional Formatting] >> [New Rule]
- Choose [Format only cells that contain]
- In [Format only cells with:], choose "Errors"
- Choose proper formats in [Format..] button
Can I use library that used android support with Androidx projects.
API 29.+ usage AndroidX libraries. If you are using API 29.+, then you cannot remove these. If you want to remove AndroidX, then you need to remove the entire 29.+ API from your SDK:
This will work fine.
await is only valid in async function
The error is not refering to myfunction but to start.
async function start() {
....
const result = await helper.myfunction('test', 'test');
}
// My function_x000D_
const myfunction = async function(x, y) {_x000D_
return [_x000D_
x,_x000D_
y,_x000D_
];_x000D_
}_x000D_
_x000D_
// Start function_x000D_
const start = async function(a, b) {_x000D_
const result = await myfunction('test', 'test');_x000D_
_x000D_
console.log(result);_x000D_
}_x000D_
_x000D_
// Call start_x000D_
start();I use the opportunity of this question to advise you about an known anti pattern using await which is : return await.
WRONG
async function myfunction() {_x000D_
console.log('Inside of myfunction');_x000D_
}_x000D_
_x000D_
// Here we wait for the myfunction to finish_x000D_
// and then returns a promise that'll be waited for aswell_x000D_
// It's useless to wait the myfunction to finish before to return_x000D_
// we can simply returns a promise that will be resolved later_x000D_
_x000D_
// useless async here_x000D_
async function start() {_x000D_
// useless await here_x000D_
return await myfunction();_x000D_
}_x000D_
_x000D_
// Call start_x000D_
(async() => {_x000D_
console.log('before start');_x000D_
_x000D_
await start();_x000D_
_x000D_
console.log('after start');_x000D_
})();CORRECT
async function myfunction() {_x000D_
console.log('Inside of myfunction');_x000D_
}_x000D_
_x000D_
// Here we wait for the myfunction to finish_x000D_
// and then returns a promise that'll be waited for aswell_x000D_
// It's useless to wait the myfunction to finish before to return_x000D_
// we can simply returns a promise that will be resolved later_x000D_
_x000D_
// Also point that we don't use async keyword on the function because_x000D_
// we can simply returns the promise returned by myfunction_x000D_
function start() {_x000D_
return myfunction();_x000D_
}_x000D_
_x000D_
// Call start_x000D_
(async() => {_x000D_
console.log('before start');_x000D_
_x000D_
await start();_x000D_
_x000D_
console.log('after start');_x000D_
})();Also, know that there is a special case where return await is correct and important : (using try/catch)
How to find the sum of an array of numbers
You can also use reduceRight.
[1,2,3,4,5,6].reduceRight(function(a,b){return a+b;})
which results output as 21.
Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/ReduceRight
No ConcurrentList<T> in .Net 4.0?
The reason why there is no ConcurrentList is because it fundamentally cannot be written. The reason why is that several important operations in IList rely on indices, and that just plain won't work. For example:
int catIndex = list.IndexOf("cat");
list.Insert(catIndex, "dog");
The effect that the author is going after is to insert "dog" before "cat", but in a multithreaded environment, anything can happen to the list between those two lines of code. For example, another thread might do list.RemoveAt(0), shifting the entire list to the left, but crucially, catIndex will not change. The impact here is that the Insert operation will actually put the "dog" after the cat, not before it.
The several implementations that you see offered as "answers" to this question are well-meaning, but as the above shows, they don't offer reliable results. If you really want list-like semantics in a multithreaded environment, you can't get there by putting locks inside the list implementation methods. You have to ensure that any index you use lives entirely inside the context of the lock. The upshot is that you can use a List in a multithreaded environment with the right locking, but the list itself cannot be made to exist in that world.
If you think you need a concurrent list, there are really just two possibilities:
- What you really need is a ConcurrentBag
- You need to create your own collection, perhaps implemented with a List and your own concurrency control.
If you have a ConcurrentBag and are in a position where you need to pass it as an IList, then you have a problem, because the method you're calling has specified that they might try to do something like I did above with the cat & dog. In most worlds, what that means is that the method you're calling is simply not built to work in a multi-threaded environment. That means you either refactor it so that it is or, if you can't, you're going to have to handle it very carefully. You you'll almost certainly be required to create your own collection with its own locks, and call the offending method within a lock.
How to change sa password in SQL Server 2008 express?
If you want to change your 'sa' password with SQL Server Management Studio, here are the steps:
- Login using Windows Authentication and ".\SQLExpress" as Server Name
Change server authentication mode - Right click on root, choose Properties, from Security tab select "SQL Server and Windows Authentication mode", click OK
Set sa password - Navigate to Security > Logins > sa, right click on it, choose Properties, from General tab set the Password (don't close the window)
Grant permission - Go to Status tab, make sure the Grant and Enabled radiobuttons are chosen, click OK
Restart SQLEXPRESS service from your local services (Window+R > services.msc)
Initialize a string in C to empty string
It's a bit late but I think your issue may be that you've created a zero-length array, rather than an array of length 1.
A string is a series of characters followed by a string terminator ('\0'). An empty string ("") consists of no characters followed by a single string terminator character - i.e. one character in total.
So I would try the following:
string[1] = ""
Note that this behaviour is not the emulated by strlen, which does not count the terminator as part of the string length.
Java parsing XML document gives "Content not allowed in prolog." error
I assume you have proper xml encoding and matching with Schema.
If you still get this error, check code that unmarshalls the xml and input type you have used. Because XML documents declare their own encoding, it is preferable to create a StreamSource object from an InputStream instead of from a Reader, so that XML processor can correctly handle the declared encoding [Ref Book: Java in A Nutshell ]
Hope this helps!
Speed up rsync with Simultaneous/Concurrent File Transfers?
I've developed a python package called: parallel_sync
https://pythonhosted.org/parallel_sync/pages/examples.html
Here is a sample code how to use it:
from parallel_sync import rsync
creds = {'user': 'myusername', 'key':'~/.ssh/id_rsa', 'host':'192.168.16.31'}
rsync.upload('/tmp/local_dir', '/tmp/remote_dir', creds=creds)
parallelism by default is 10; you can increase it:
from parallel_sync import rsync
creds = {'user': 'myusername', 'key':'~/.ssh/id_rsa', 'host':'192.168.16.31'}
rsync.upload('/tmp/local_dir', '/tmp/remote_dir', creds=creds, parallelism=20)
however note that ssh typically has the MaxSessions by default set to 10 so to increase it beyond 10, you'll have to modify your ssh settings.
SQL Query Where Field DOES NOT Contain $x
SELECT * FROM table WHERE field1 NOT LIKE '%$x%'; (Make sure you escape $x properly beforehand to avoid SQL injection)
Edit: NOT IN does something a bit different - your question isn't totally clear so pick which one to use. LIKE 'xxx%' can use an index. LIKE '%xxx' or LIKE '%xxx%' can't.
how to configure lombok in eclipse luna
After two weeks of searching and trying, the following instructions works in
Eclipse Java EE IDE for Web Developers.
Version: Oxygen.3a Release (4.7.3a) Build id: 20180405-1200
- Copy Lombok.jar to installation directory my case (/opt/eclipse-spring/)
- Modify eclipse.ini openFile --launcher.appendVmargs
as follows:
openFile
--launcher.appendVmargs
-vmargs
-javaagent:/opt/eclipse-spring/lombok.jar
-Dosgi.requiredJavaVersion=1.8
......
In build.gradle dependencies, add lombok.jar from file as follows
compileOnly files('/opt/eclipse-spring/lombok.jar')
And yippee, I have a great day coding with lombok.
Select Tag Helper in ASP.NET Core MVC
You can use below code for multiple select:
<select asp-for="EmployeeId" multiple="multiple" asp-items="@ViewBag.Employees">
<option>Please select</option>
</select>
You can also use:
<select id="EmployeeId" name="EmployeeId" multiple="multiple" asp-items="@ViewBag.Employees">
<option>Please select</option>
</select>
Wait .5 seconds before continuing code VB.net
In web application a timer will be the best approach.
Just fyi, in desktop application I use this instead, inside an async method.
...
Await Task.Run(Sub()
System.Threading.Thread.Sleep(5000)
End Sub)
...
It work for me, importantly it doesn't freeze entire screen. But again this is on desktop, i try in web application it does freeze.
Show values from a MySQL database table inside a HTML table on a webpage
<?php
$mysql_hostname = "localhost";
$mysql_user = "ram";
$mysql_password = "ram";
$mysql_database = "mydb";
$bd = mysql_connect($mysql_hostname, $mysql_user, $mysql_password) or die("Oops some thing went wrong");
mysql_select_db($mysql_database, $bd) or die("Oops some thing went wrong");// we are now connected to database
$result = mysql_query("SELECT * FROM users"); // selecting data through mysql_query()
echo '<table border=1px>'; // opening table tag
echo'<th>No</th><th>Username</th><th>Password</th><th>Email</th>'; //table headers
while($data = mysql_fetch_array($result))
{
// we are running a while loop to print all the rows in a table
echo'<tr>'; // printing table row
echo '<td>'.$data['id'].'</td><td>'.$data['username'].'</td><td>'.$data['password'].'</td><td>'.$data['email'].'</td>'; // we are looping all data to be printed till last row in the table
echo'</tr>'; // closing table row
}
echo '</table>'; //closing table tag
?>
it would print the table like this just read line by line so that you can understand it easily..
How can I debug a Perl script?
I would also recommend using the Perl debugger.
However, since you asked about something like shell's -x have a look at the Devel::Trace module which does something similar.
How do I look inside a Python object?
Try using:
print(object.stringify())
- where
objectis the variable name of the object you are trying to inspect.
This prints out a nicely formatted and tabbed output showing all the hierarchy of keys and values in the object.
NOTE: This works in python3. Not sure if it works in earlier versions
UPDATE: This doesn't work on all types of objects. If you encounter one of those types (like a Request object), use one of the following instead:
dir(object())
or
import pprint
then:
pprint.pprint(object.__dict__)
pandas dataframe convert column type to string or categorical
With pandas >= 1.0 there is now a dedicated string datatype:
1) You can convert your column to this pandas string datatype using .astype('string'):
df['zipcode'] = df['zipcode'].astype('string')
2) This is different from using str which sets the pandas object datatype:
df['zipcode'] = df['zipcode'].astype(str)
3) For changing into categorical datatype use:
df['zipcode'] = df['zipcode'].astype('category')
You can see this difference in datatypes when you look at the info of the dataframe:
df = pd.DataFrame({
'zipcode_str': [90210, 90211] ,
'zipcode_string': [90210, 90211],
'zipcode_category': [90210, 90211],
})
df['zipcode_str'] = df['zipcode_str'].astype(str)
df['zipcode_string'] = df['zipcode_str'].astype('string')
df['zipcode_category'] = df['zipcode_category'].astype('category')
df.info()
# you can see that the first column has dtype object
# while the second column has the new dtype string
# the third column has dtype category
# Column Non-Null Count Dtype
--- ------ -------------- -----
0 zipcode_str 2 non-null object
1 zipcode_string 2 non-null string
2 zipcode_category 2 non-null category
dtypes: category(1), object(1), string(1)
From the docs:
The 'string' extension type solves several issues with object-dtype NumPy arrays:
You can accidentally store a mixture of strings and non-strings in an object dtype array. A StringArray can only store strings.
object dtype breaks dtype-specific operations like DataFrame.select_dtypes(). There isn’t a clear way to select just text while excluding non-text, but still object-dtype columns.
When reading code, the contents of an object dtype array is less clear than string.
More info on working with the new string datatype can be found here: https://pandas.pydata.org/pandas-docs/stable/user_guide/text.html
How to send emails from my Android application?
I used this code to send mail by launching default mail app compose section directly.
Intent i = new Intent(Intent.ACTION_SENDTO);
i.setType("message/rfc822");
i.setData(Uri.parse("mailto:"));
i.putExtra(Intent.EXTRA_EMAIL , new String[]{"[email protected]"});
i.putExtra(Intent.EXTRA_SUBJECT, "Subject");
i.putExtra(Intent.EXTRA_TEXT , "body of email");
try {
startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
}
Authentication issues with WWW-Authenticate: Negotiate
The web server is prompting you for a SPNEGO (Simple and Protected GSSAPI Negotiation Mechanism) token.
This is a Microsoft invention for negotiating a type of authentication to use for Web SSO (single-sign-on):
- either NTLM
- or Kerberos.
See:
File size exceeds configured limit (2560000), code insight features not available
PhpStorm 2020
- Help -> Edit Custom Properties.
- File will open in Editor. Paste the section below to the file.
#---------------------------------------------------------------------
# Maximum file size (kilobytes) IDE should provide code assistance for.
# The larger file is the slower its editor works and higher overall system memory
requirements are
# if code assistance is enabled. Remove this property or set to very large number
if you need
# code assistance for any files available regardless their size.
#---------------------------------------------------------------------
idea.max.intellisense.filesize=2500
- File -> Invalidate / Restart -> Restart
This might not update sometimes and you might need to edit the root idea.properties file.
To edit this file for any version of Idea
- Go to application location i.e linux => /opt/PhpStorm[version]/bin
- Find file called idea.properties Make backup of file i.e idea.properties.old
- Open original with any txt editor.
- Find
idea.max.intellisense.filesize= - Replace with
idea.max.intellisense.filesize=your_required_sizei.eidea.max.intellisense.filesize=10480NB by default this size is in kb - Save and restart the IDE.
How to monitor network calls made from iOS Simulator
- Install WireShark
- get ip address from xcode network monitor
- listen to wifi interface
- set filter ip.addr == 192.168.1.122 in WireShark
ASP.Net MVC - Read File from HttpPostedFileBase without save
This can be done using httpPostedFileBase class returns the HttpInputStreamObject as per specified here
You should convert the stream into byte array and then you can read file content
Please refer following link
http://msdn.microsoft.com/en-us/library/system.web.httprequest.inputstream.aspx]
Hope this helps
UPDATE :
The stream that you get from your HTTP call is read-only sequential (non-seekable) and the FileStream is read/write seekable. You will need first to read the entire stream from the HTTP call into a byte array, then create the FileStream from that array.
Taken from here
// Read bytes from http input stream
BinaryReader b = new BinaryReader(file.InputStream);
byte[] binData = b.ReadBytes(file.ContentLength);
string result = System.Text.Encoding.UTF8.GetString(binData);
Toggle Class in React
For anybody reading this in 2019, after React 16.8 was released, take a look at the React Hooks. It really simplifies handling states in components. The docs are very well written with an example of exactly what you need.
Excel function to make SQL-like queries on worksheet data?
If you want run formula on worksheet by function that execute SQL statement then use Add-in A-Tools
Example, function BS_SQL("SELECT ..."):
Chrome: Uncaught SyntaxError: Unexpected end of input
See my case on another similar question:
In my case, I was trying to parse an empty JSON:
JSON.parse(stringifiedJSON);In other words, what happened was the following:
JSON.parse("");
Drawing rotated text on a HTML5 canvas
While this is sort of a follow up to the previous answer, it adds a little (hopefully).
Mainly what I want to clarify is that usually we think of drawing things like draw a rectangle at 10, 3.
So if we think about that like this: move origin to 10, 3, then draw rectangle at 0, 0.
Then all we have to do is add a rotate in between.
Another big point is the alignment of the text. It's easiest to draw the text at 0, 0, so using the correct alignment can allow us to do that without measuring the text width.
We should still move the text by an amount to get it centered vertically, and unfortunately canvas does not have great line height support, so that's a guess and check thing ( correct me if there is something better ).
I've created 3 examples that provide a point and a text with 3 alignments, to show what the actual point on the screen is where the font will go.
var font, lineHeight, x, y;
x = 100;
y = 100;
font = 20;
lineHeight = 15; // this is guess and check as far as I know
this.context.font = font + 'px Arial';
// Right Aligned
this.context.save();
this.context.translate(x, y);
this.context.rotate(-Math.PI / 4);
this.context.textAlign = 'right';
this.context.fillText('right', 0, lineHeight / 2);
this.context.restore();
this.context.fillStyle = 'red';
this.context.fillRect(x, y, 2, 2);
// Center
this.context.fillStyle = 'black';
x = 150;
y = 100;
this.context.save();
this.context.translate(x, y);
this.context.rotate(-Math.PI / 4);
this.context.textAlign = 'center';
this.context.fillText('center', 0, lineHeight / 2);
this.context.restore();
this.context.fillStyle = 'red';
this.context.fillRect(x, y, 2, 2);
// Left
this.context.fillStyle = 'black';
x = 200;
y = 100;
this.context.save();
this.context.translate(x, y);
this.context.rotate(-Math.PI / 4);
this.context.textAlign = 'left';
this.context.fillText('left', 0, lineHeight / 2);
this.context.restore();
this.context.fillStyle = 'red';
this.context.fillRect(x, y, 2, 2);
The line this.context.fillText('right', 0, lineHeight / 2); is basically 0, 0, except we move slightly for the text to be centered near the point
How do I open the "front camera" on the Android platform?
With the release of Android 2.3 (Gingerbread), you can now use the android.hardware.Camera class to get the number of cameras, information about a specific camera, and get a reference to a specific Camera. Check out the new Camera APIs here.
Is there an equivalent for var_dump (PHP) in Javascript?
Here is my solution. It replicates the behavior of var_dump well, and allows for nested objects/arrays. Note that it does not support multiple arguments.
function var_dump(variable) {
let out = "";
let type = typeof variable;
if(type == "object") {
var realType;
var length;
if(variable instanceof Array) {
realType = "array";
length = variable.length;
} else {
realType = "object";
length = Object.keys(variable).length;
}
out = `${realType}(${length}) {`;
for (const [key, value] of Object.entries(variable)) {
out += `\n [${key}]=>\n ${var_dump(value).replace(/\n/g, "\n ")}\n`;
}
out += "}";
} else if(type == "string") {
out = `${type}(${type.length}) "${variable}"`;
} else {
out = `${type}(${variable.toString()})`;
}
return out;
}
console.log(var_dump(1.5));
console.log(var_dump("Hello!"));
console.log(var_dump([]));
console.log(var_dump([1,2,3,[1,2]]));
console.log(var_dump({"a":"b"}));How to debug Lock wait timeout exceeded on MySQL?
The big problem with this exception is that its usually not reproducible in a test environment and we are not around to run innodb engine status when it happens on prod. So in one of the projects I put the below code into a catch block for this exception. That helped me catch the engine status when the exception happened. That helped a lot.
Statement st = con.createStatement();
ResultSet rs = st.executeQuery("SHOW ENGINE INNODB STATUS");
while(rs.next()){
log.info(rs.getString(1));
log.info(rs.getString(2));
log.info(rs.getString(3));
}
How to create an AVD for Android 4.0
You can also get this problem if you have your Android SDK version controlled. You get a slightly different error:
Unable to find a 'userdata.img' file for ABI .svn to copy into the AVD folder.
For some reason, the Android Virtual Device (AVD) manager believes the .svn folder is specifying an application binary interface (ABI). It looks for userdata.img within the .svn folder and can't find it, so it fails.
I used the shell extension found in the responses for the Stack Overflow question Removing .svn files from all directories to remove all .svn folders recursively from the android-sdk folder. After this, the AVD manager was able to create an AVD successfully. I have yet to figure out how to get the SDK to play nicely with Subversion.
ISO time (ISO 8601) in Python
Correct me if I'm wrong (I'm not), but the offset from UTC changes with daylight saving time. So you should use
tz = str.format('{0:+06.2f}', float(time.altzone) / 3600)
I also believe that the sign should be different:
tz = str.format('{0:+06.2f}', -float(time.altzone) / 3600)
I could be wrong, but I don't think so.
Converting Chart.js canvas chart to image using .toDataUrl() results in blank image
First convert your Chart.js canvas to base64 string.
var url_base64 = document.getElementById('myChart').toDataURL('image/png');
Set it as a href attribute for anchor tag.
link.href = url_base64;
<a id='link' download='filename.png'>Save as Image</a>
Permanently hide Navigation Bar in an activity
After watching the DevBytes video (by Roman Nurik) and reading the very last line in the docs, which says:
Note: If you like the auto-hiding behavior of IMMERSIVE_STICKY but need to show your own UI controls as well, just use IMMERSIVE combined with Handler.postDelayed() or something similar to re-enter immersive mode after a few seconds.
the answer, radu122 gave, worked for me. Just setup a handler and your will be good to go.
Here is the code which works for me:
@Override
protected void onResume() {
super.onResume();
executeDelayed();
}
private void executeDelayed() {
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
// execute after 500ms
hideNavBar();
}
}, 500);
}
private void hideNavBar() {
if (Build.VERSION.SDK_INT >= 19) {
View v = getWindow().getDecorView();
v.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
}
}
Google says "after a few seconds" - but I want to provide this functionality as soon as possible. Maybe I will change the value later, if I have to, I will update this answer.
How do I put the image on the right side of the text in a UIButton?
Finally I got the perfect result what I want.
Here is my code.
self.semanticContentAttribute = .forceRightToLeft
self.contentHorizontalAlignment = .left
self.imageView?.translatesAutoresizingMaskIntoConstraints = false
self.imageView?.centerYAnchor.constraint(equalTo: self.centerYAnchor, constant: 0.0).isActive = true
self.imageView?.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: 0.0).isActive = true
This code makes right text/left image button without any padding.
ab load testing
Please walk me through the commands I should run to figure this out.
The simplest test you can do is to perform 1000 requests, 10 at a time (which approximately simulates 10 concurrent users getting 100 pages each - over the length of the test).
ab -n 1000 -c 10 -k -H "Accept-Encoding: gzip, deflate" http://www.example.com/
-n 1000 is the number of requests to make.
-c 10 tells AB to do 10 requests at a time, instead of 1 request at a time, to better simulate concurrent visitors (vs. sequential visitors).
-k sends the KeepAlive header, which asks the web server to not shut down the connection after each request is done, but to instead keep reusing it.
I'm also sending the extra header Accept-Encoding: gzip, deflate because mod_deflate is almost always used to compress the text/html output 25%-75% - the effects of which should not be dismissed due to it's impact on the overall performance of the web server (i.e., can transfer 2x the data in the same amount of time, etc).
Results:
Benchmarking www.example.com (be patient)
Completed 100 requests
...
Finished 1000 requests
Server Software: Apache/2.4.10
Server Hostname: www.example.com
Server Port: 80
Document Path: /
Document Length: 428 bytes
Concurrency Level: 10
Time taken for tests: 1.420 seconds
Complete requests: 1000
Failed requests: 0
Keep-Alive requests: 995
Total transferred: 723778 bytes
HTML transferred: 428000 bytes
Requests per second: 704.23 [#/sec] (mean)
Time per request: 14.200 [ms] (mean)
Time per request: 1.420 [ms] (mean, across all concurrent requests)
Transfer rate: 497.76 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.1 0 1
Processing: 5 14 7.5 12 77
Waiting: 5 14 7.5 12 77
Total: 5 14 7.5 12 77
Percentage of the requests served within a certain time (ms)
50% 12
66% 14
75% 15
80% 16
90% 24
95% 29
98% 36
99% 41
100% 77 (longest request)
For the simplest interpretation, ignore everything BUT this line:
Requests per second: 704.23 [#/sec] (mean)
Multiply that by 60, and you have your requests per minute.
To get real world results, you'll want to test Wordpress instead of some static HTML or index.php file because you need to know how everything performs together: including complex PHP code, and multiple MySQL queries...
For example here is the results of testing a fresh install of Wordpress on the same system and WAMP environment (I'm using WampDeveloper, but there are also Xampp, WampServer, and others)...
Requests per second: 18.68 [#/sec] (mean)
That's 37x slower now!
After the load test, there are a number of things you can do to improve the overall performance (Requests Per Second), and also make the web server more stable under greater load (e.g., increasing the -n and the -c tends to crash Apache), that you can read about here:
batch file to list folders within a folder to one level
print all folders name where batch script file is kept
for /d %%d in (*.*) do (
set test=%%d
echo !test!
)
pause
How to convert password into md5 in jquery?
Get the field value through the id and send with ajax
var field = $("#field").val();
$.ajax({
type: "POST",
url: "db.php",
data: {variable_name:field},
async:false,
dataType:"json",
success: function(response) {
alert(response);
}
});
At db.php file get the variable name
$variable_name = $_GET['variable_name'];
mysql_query("SELECT password FROM table_name WHERE password='".md5($variable_name)."'");
How to encrypt a large file in openssl using public key
In more explanation for n. 'pronouns' m.'s answer,
Public-key crypto is not for encrypting arbitrarily long files. One uses a symmetric cipher (say AES) to do the normal encryption. Each time a new random symmetric key is generated, used, and then encrypted with the RSA cipher (public key). The ciphertext together with the encrypted symmetric key is transferred to the recipient. The recipient decrypts the symmetric key using his private key, and then uses the symmetric key to decrypt the message.
There is the flow of Encryption:
+---------------------+ +--------------------+
| | | |
| generate random key | | the large file |
| (R) | | (F) |
| | | |
+--------+--------+---+ +----------+---------+
| | |
| +------------------+ |
| | |
v v v
+--------+------------+ +--------+--+------------+
| | | |
| encrypt (R) with | | encrypt (F) |
| your RSA public key | | with symmetric key (R) |
| | | |
| ASym(PublicKey, R) | | EF = Sym(F, R) |
| | | |
+----------+----------+ +------------+-----------+
| |
+------------+ +--------------+
| |
v v
+--------------+-+---------------+
| |
| send this files to the peer |
| |
| ASym(PublicKey, R) + EF |
| |
+--------------------------------+
And the flow of Decryption:
+----------------+ +--------------------+
| | | |
| EF = Sym(F, R) | | ASym(PublicKey, R) |
| | | |
+-----+----------+ +---------+----------+
| |
| |
| v
| +-------------------------+-----------------+
| | |
| | restore key (R) |
| | |
| | R <= ASym(PrivateKey, ASym(PublicKey, R)) |
| | |
| +---------------------+---------------------+
| |
v v
+---+-------------------------+---+
| |
| restore the file (F) |
| |
| F <= Sym(Sym(F, R), R) |
| |
+---------------------------------+
Besides, you can use this commands:
# generate random symmetric key
openssl rand -base64 32 > /config/key.bin
# encryption
openssl rsautl -encrypt -pubin -inkey /config/public_key.pem -in /config/key.bin -out /config/key.bin.enc
openssl aes-256-cbc -a -pbkdf2 -salt -in $file_name -out $file_name.enc -k $(cat /config/key.bin)
# now you can send this files: $file_name.enc + /config/key.bin.enc
# decryption
openssl rsautl -decrypt -inkey /config/private_key.pem -in /config/key.bin.enc -out /config/key.bin
openssl aes-256-cbc -d -a -in $file_name.enc -out $file_name -k $(cat /config/key.bin)
How to recursively find and list the latest modified files in a directory with subdirectories and times
This could be done with a recursive function in Bash too.
Let F be a function that displays the time of file which must be lexicographically sortable yyyy-mm-dd, etc., (OS-dependent?)
F(){ stat --format %y "$1";} # Linux
F(){ ls -E "$1"|awk '{print$6" "$7}';} # SunOS: maybe this could be done easier
R, the recursive function that runs through directories:
R(){ local f;for f in "$1"/*;do [ -d "$f" ]&&R $f||F "$f";done;}
And finally
for f in *;do [ -d "$f" ]&&echo `R "$f"|sort|tail -1`" $f";done
To the power of in C?
There's no operator for such usage in C, but a family of functions:
double pow (double base , double exponent);
float powf (float base , float exponent);
long double powl (long double base, long double exponent);
Note that the later two are only part of standard C since C99.
If you get a warning like:
"incompatible implicit declaration of built in function 'pow' "
That's because you forgot #include <math.h>.
Optimal number of threads per core
If your threads don't do I/O, synchronization, etc., and there's nothing else running, 1 thread per core will get you the best performance. However that very likely not the case. Adding more threads usually helps, but after some point, they cause some performance degradation.
Not long ago, I was doing performance testing on a 2 quad-core machine running an ASP.NET application on Mono under a pretty decent load. We played with the minimum and maximum number of threads and in the end we found out that for that particular application in that particular configuration the best throughput was somewhere between 36 and 40 threads. Anything outside those boundaries performed worse. Lesson learned? If I were you, I would test with different number of threads until you find the right number for your application.
One thing for sure: 4k threads will take longer. That's a lot of context switches.
Force HTML5 youtube video
If you're using the iframe embed api, you can put html5:1 as one of the playerVars arguments, like so:
player = new YT.Player('player', {
height: '390',
width: '640',
videoId: '<VIDEO ID>',
playerVars: {
html5: 1
},
});
Totally works.
Show percent % instead of counts in charts of categorical variables
Here is a workaround for faceted data. (The accepted answer by @Andrew does not work in this case.) The idea is to calculate the percentage value using dplyr and then to use geom_col to create the plot.
library(ggplot2)
library(scales)
library(magrittr)
library(dplyr)
binwidth <- 30
mtcars.stats <- mtcars %>%
group_by(cyl) %>%
mutate(bin = cut(hp, breaks=seq(0,400, binwidth),
labels= seq(0+binwidth,400, binwidth)-(binwidth/2)),
n = n()) %>%
group_by(cyl, bin) %>%
summarise(p = n()/n[1]) %>%
ungroup() %>%
mutate(bin = as.numeric(as.character(bin)))
ggplot(mtcars.stats, aes(x = bin, y= p)) +
geom_col() +
scale_y_continuous(labels = percent) +
facet_grid(cyl~.)
This is the plot:
Execute a shell script in current shell with sudo permission
What you are trying to do is impossible; your current shell is running under your regular user ID (i.e. without root the access sudo would give you), and there is no way to grant it root access. What sudo does is create a new *sub*process that runs as root. The subprocess could be just a regular program (e.g. sudo cp ... runs the cp program in a root process) or it could be a root subshell, but it cannot be the current shell.
(It's actually even more impossible than that, because the sudo command itself is executed as a subprocess of the current shell -- meaning that in a sense it's already too late for it to do anything in the "current shell", because that's not where it executes.)
Insert line after first match using sed
Try doing this using GNU sed:
sed '/CLIENTSCRIPT="foo"/a CLIENTSCRIPT2="hello"' file
if you want to substitute in-place, use
sed -i '/CLIENTSCRIPT="foo"/a CLIENTSCRIPT2="hello"' file
Output
CLIENTSCRIPT="foo"
CLIENTSCRIPT2="hello"
CLIENTFILE="bar"
Doc
- see sed doc and search
\a(append)
How to increase executionTimeout for a long-running query?
RE. "Can we set this value for individual page" – MonsterMMORPG.
Yes, you can (& normally should) enclose the previous answer using the location-tag.
e.g.
...
<location path="YourWebpage.aspx">
<system.web>
<httpRuntime executionTimeout="300" maxRequestLength="29296" />
</system.web>
</location>
</configuration>
The above snippet is taken from the end of my own working web.config, which I tested yesterday - it works for me.
Customize UITableView header section
Use tableView: willDisplayHeaderView: to customize the view when it is about to be displayed.
This gives you the advantage of being able to take the view that was already created for the header view and extend it, instead of having to recreate the whole header view yourself.
Here is an example that colors the header section based on a BOOL and adds a detail text element to the header.
- (void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section
{
// view.tintColor = [UIColor colorWithWhite:0.825 alpha:1.0]; // gray
// view.tintColor = [UIColor colorWithRed:0.825 green:0.725 blue:0.725 alpha:1.0]; // reddish
// view.tintColor = [UIColor colorWithRed:0.925 green:0.725 blue:0.725 alpha:1.0]; // pink
// Conditionally tint the header view
BOOL isMyThingOnOrOff = [self isMyThingOnOrOff];
if (isMyThingOnOrOff) {
view.tintColor = [UIColor colorWithRed:0.725 green:0.925 blue:0.725 alpha:1.0];
} else {
view.tintColor = [UIColor colorWithRed:0.925 green:0.725 blue:0.725 alpha:1.0];
}
/* Add a detail text label (which has its own view to the section header… */
CGFloat xOrigin = 100; // arbitrary
CGFloat hInset = 20;
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(xOrigin + hInset, 5, tableView.frame.size.width - xOrigin - (hInset * 2), 22)];
label.textAlignment = NSTextAlignmentRight;
[label setFont:[UIFont fontWithName:@"Helvetica-Bold" size:14.0]
label.text = @"Hi. I'm the detail text";
[view addSubview:label];
}
JUnit Testing private variables?
I can't tell if you've found some special case code which requires you to test against private fields. But in my experience you never have to test something private - always public. Maybe you could give an example of some code where you need to test private?
Can you use a trailing comma in a JSON object?
Rather than engage in a debating club, I would apply Defensive Programming. As a developer of an app that receives json data, I'd allow the trailing comma. When developing an app that writes json, I'd use one of the clever techniques of the other answers to only add commas between items. There are bigger problems to be solved...
How can I create a dynamically sized array of structs?
This looks like an academic exercise which unfortunately makes it harder since you can't use C++. Basically you have to manage some of the overhead for the allocation and keep track how much memory has been allocated if you need to resize it later. This is where the C++ standard library shines.
For your example, the following code allocates the memory and later resizes it:
// initial size
int count = 100;
words *testWords = (words*) malloc(count * sizeof(words));
// resize the array
count = 76;
testWords = (words*) realloc(testWords, count* sizeof(words));
Keep in mind, in your example you are just allocating a pointer to a char and you still need to allocate the string itself and more importantly to free it at the end. So this code allocates 100 pointers to char and then resizes it to 76, but does not allocate the strings themselves.
I have a suspicion that you actually want to allocate the number of characters in a string which is very similar to the above, but change word to char.
EDIT: Also keep in mind it makes a lot of sense to create functions to perform common tasks and enforce consistency so you don't copy code everywhere. For example, you might have a) allocate the struct, b) assign values to the struct, and c) free the struct. So you might have:
// Allocate a words struct
words* CreateWords(int size);
// Assign a value
void AssignWord(word* dest, char* str);
// Clear a words structs (and possibly internal storage)
void FreeWords(words* w);
EDIT: As far as resizing the structs, it is identical to resizing the char array. However the difference is if you make the struct array bigger, you should probably initialize the new array items to NULL. Likewise, if you make the struct array smaller, you need to cleanup before removing the items -- that is free items that have been allocated (and only the allocated items) before you resize the struct array. This is the primary reason I suggested creating helper functions to help manage this.
// Resize words (must know original and new size if shrinking
// if you need to free internal storage first)
void ResizeWords(words* w, size_t oldsize, size_t newsize);
IF a cell contains a string
SEARCH does not return 0 if there is no match, it returns #VALUE!. So you have to wrap calls to SEARCH with IFERROR.
For example...
=IF(IFERROR(SEARCH("cat", A1), 0), "cat", "none")
or
=IF(IFERROR(SEARCH("cat",A1),0),"cat",IF(IFERROR(SEARCH("22",A1),0),"22","none"))
Here, IFERROR returns the value from SEARCH when it works; the given value of 0 otherwise.
Java FileOutputStream Create File if not exists
You can potentially get a FileNotFoundException if the file does not exist.
Java documentation says:
Whether or not a file is available or may be created depends upon the underlying platform http://docs.oracle.com/javase/7/docs/api/java/io/FileOutputStream.html
If you're using Java 7 you can use the java.nio package:
The options parameter specifies how the the file is created or opened... it opens the file for writing, creating the file if it doesn't exist...
http://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html
Apache Cordova - uninstall globally
This can happen when the cordova was installed globally on a different version of the node.
Being necessary to manually delete yourself as suggested in the previous comment:
which cordova
it will output something like this
/usr/local/bin/
then removing by
rm -rf /usr/local/bin/cordova
Entity Framework The underlying provider failed on Open
We had connection string in web.config with Data Source=localhost, and there was this error (MSSQL was on the same machine). Changing it to actual `DOMAIN\MACHINE' helped, somewhy.
Difference between / and /* in servlet mapping url pattern
<url-pattern>/*</url-pattern>
The /* on a servlet overrides all other servlets, including all servlets provided by the servletcontainer such as the default servlet and the JSP servlet. Whatever request you fire, it will end up in that servlet. This is thus a bad URL pattern for servlets. Usually, you'd like to use /* on a Filter only. It is able to let the request continue to any of the servlets listening on a more specific URL pattern by calling FilterChain#doFilter().
<url-pattern>/</url-pattern>
The / doesn't override any other servlet. It only replaces the servletcontainer's builtin default servlet for all requests which doesn't match any other registered servlet. This is normally only invoked on static resources (CSS/JS/image/etc) and directory listings. The servletcontainer's builtin default servlet is also capable of dealing with HTTP cache requests, media (audio/video) streaming and file download resumes. Usually, you don't want to override the default servlet as you would otherwise have to take care of all its tasks, which is not exactly trivial (JSF utility library OmniFaces has an open source example). This is thus also a bad URL pattern for servlets. As to why JSP pages doesn't hit this servlet, it's because the servletcontainer's builtin JSP servlet will be invoked, which is already by default mapped on the more specific URL pattern *.jsp.
<url-pattern></url-pattern>
Then there's also the empty string URL pattern . This will be invoked when the context root is requested. This is different from the <welcome-file> approach that it isn't invoked when any subfolder is requested. This is most likely the URL pattern you're actually looking for in case you want a "home page servlet". I only have to admit that I'd intuitively expect the empty string URL pattern and the slash URL pattern / be defined exactly the other way round, so I can understand that a lot of starters got confused on this. But it is what it is.
Front Controller
In case you actually intend to have a front controller servlet, then you'd best map it on a more specific URL pattern like *.html, *.do, /pages/*, /app/*, etc. You can hide away the front controller URL pattern and cover static resources on a common URL pattern like /resources/*, /static/*, etc with help of a servlet filter. See also How to prevent static resources from being handled by front controller servlet which is mapped on /*. Noted should be that Spring MVC has a builtin static resource servlet, so that's why you could map its front controller on / if you configure a common URL pattern for static resources in Spring. See also How to handle static content in Spring MVC?
favicon.png vs favicon.ico - why should I use PNG instead of ICO?
Avoid PNG in any case if you want reliable IE6 compatibility.
How to use document.getElementByName and getElementByTag?
- The
getElementsByName()method accesses all elements with the specified name. this method returns collection of elements that is an array. - The
getElementsByTagName()method accesses all elements with the specified tagname. this method returns collection of elements that is an array. - Accesses the first element with the specified id. this method returns only a single element.
eg:
<script type="text/javascript">
function getElements() {
var x=document.getElementById("y");
alert(x.value);
}
</script>
</head>
<body>
<input name="x" id="y" type="text" size="20" /><br />
This will return a single HTML element and display the value attribute of it.
<script type="text/javascript">
function getElements() {
var x=document.getElementsByName("x");
alert(x.length);
}
</script>
</head>
<body>
<input name="x" id="y" type="text" size="20" /><br />
<input name="x" id="y" type="text" size="20" /><br />
this will return an array of HTML elements and number of elements that match the name attribute.
Extracted from w3schools.
How I can print to stderr in C?
To print your context ,you can write code like this :
FILE *fp;
char *of;
sprintf(of,"%s%s",text1,text2);
fp=fopen(of,'w');
fprintf(fp,"your print line");
ng-if, not equal to?
Here is a nifty solution with a filter:
app.filter('status', function() {
var statusDict = {
0: "No payment",
1: "Late",
2: "Late",
3: "Some payment made",
4: "Some payment made",
5: "Some payment made",
6: "Late and further taken out"
};
return function(status) {
return statusDict[status] || 'Error';
};
});
Markup:
<div ng-repeat="details in myDataSet">
<p>{{ details.Name }}</p>
<p>{{ details.DOB }}</p>
<p>{{ details.Payment[0].Status | status }}</p>
<p>{{ details.Gender}}</p>
</div>
Detect the Enter key in a text input field
This code handled every input for me in the whole site. It checks for the ENTER KEY inside an INPUT field and doesn't stop on TEXTAREA or other places.
$(document).on("keydown", "input", function(e){
if(e.which == 13){
event.preventDefault();
return false;
}
});
Export data from Chrome developer tool
To get this in excel or csv format- right click the folder and select "copy response"- paste to excel and use text to columns.
How to retrieve Jenkins build parameters using the Groovy API?
Update: Jenkins 2.x solution:
With Jenkins 2 pipeline dsl, you can directly access any parameter with the trivial syntax based on the params (Map) built-in:
echo " FOOBAR value: ${params.'FOOBAR'}"
The returned value will be a String or a boolean depending on the Parameter type itself. The syntax is the same for scripted or declarative syntax. More info at: https://jenkins.io/doc/book/pipeline/jenkinsfile/#handling-parameters
Original Answer for Jenkins 1.x:
For Jenkins 1.x, the syntax is based on the build.buildVariableResolver built-ins:
// ... or if you want the parameter by name ...
def hardcoded_param = "FOOBAR"
def resolver = build.buildVariableResolver
def hardcoded_param_value = resolver.resolve(hardcoded_param)
Please note the official Jenkins Wiki page covers this in more details as well, especially how to iterate upon the build parameters: https://wiki.jenkins-ci.org/display/JENKINS/Parameterized+System+Groovy+script
The salient part is reproduced below:
// get parameters
def parameters = build?.actions.find{ it instanceof ParametersAction }?.parameters
parameters.each {
println "parameter ${it.name}:"
println it.dump()
}
java.net.ConnectException: Connection refused
I had same problem and the problem was that I was not closing socket object.After using socket.close(); problem solved. This code works for me.
ClientDemo.java
public class ClientDemo {
public static void main(String[] args) throws UnknownHostException,
IOException {
Socket socket = new Socket("127.0.0.1", 55286);
OutputStreamWriter os = new OutputStreamWriter(socket.getOutputStream());
os.write("Santosh Karna");
os.flush();
socket.close();
}
}
and ServerDemo.java
public class ServerDemo {
public static void main(String[] args) throws IOException {
System.out.println("server is started");
ServerSocket serverSocket= new ServerSocket(55286);
System.out.println("server is waiting");
Socket socket=serverSocket.accept();
System.out.println("Client connected");
BufferedReader reader=new BufferedReader(new InputStreamReader(socket.getInputStream()));
String str=reader.readLine();
System.out.println("Client data: "+str);
socket.close();
serverSocket.close();
}
}
bootstrap initially collapsed element
You need to remove "in" from "collapse in"
How to compare dates in c#
If you have date in DateTime variable then its a DateTime object and doesn't contain any format. Formatted date are expressed as string when you call DateTime.ToString method and provide format in it.
Lets say you have two DateTime variable, you can use the compare method for comparision,
DateTime date1 = new DateTime(2009, 8, 1, 0, 0, 0);
DateTime date2 = new DateTime(2009, 8, 2, 0, 0, 0);
int result = DateTime.Compare(date1, date2);
string relationship;
if (result < 0)
relationship = "is earlier than";
else if (result == 0)
relationship = "is the same time as";
else
relationship = "is later than";
Code snippet taken from msdn.
How to print like printf in Python3?
print("Name={}, balance={}".format(var-name, var-balance))
Show animated GIF
public class aiubMain {
public static void main(String args[]) throws MalformedURLException{
//home frame = new home();
java.net.URL imgUrl2 = home.class.getResource("Campus.gif");
Icon icon = new ImageIcon(imgUrl2);
JLabel label = new JLabel(icon);
JFrame f = new JFrame("Animation");
f.getContentPane().add(label);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
javascript popup alert on link click
just make it function,
<script type="text/javascript">
function AlertIt() {
var answer = confirm ("Please click on OK to continue.")
if (answer)
window.location="http://www.continue.com";
}
</script>
<a href="javascript:AlertIt();">click me</a>
How to fix "unable to write 'random state' " in openssl
I did not find where the .rnd file is so I ran the cmd as administrator and it worked like a charm.
Visual Studio: LINK : fatal error LNK1181: cannot open input file
Go to:
Project properties -> Linker -> General -> Link Library Dependencies set No.
Set folder browser dialog start location
Set the SelectedPath property before you call ShowDialog ...
folderBrowserDialog1.SelectedPath = @"c:\temp\";
folderBrowserDialog1.ShowDialog();
Will start them at C:\Temp
How can I create a progress bar in Excel VBA?
Sometimes a simple message in the status bar is enough:
This is very simple to implement:
Dim x As Integer
Dim MyTimer As Double
'Change this loop as needed.
For x = 1 To 50
' Do stuff
Application.StatusBar = "Progress: " & x & " of 50: " & Format(x / 50, "0%")
Next x
Application.StatusBar = False
Save and load MemoryStream to/from a file
Assuming that MemoryStream name is ms.
This code writes down MemoryStream to a file:
using (FileStream file = new FileStream("file.bin", FileMode.Create, System.IO.FileAccess.Write)) {
byte[] bytes = new byte[ms.Length];
ms.Read(bytes, 0, (int)ms.Length);
file.Write(bytes, 0, bytes.Length);
ms.Close();
}
and this reads a file to a MemoryStream :
using (MemoryStream ms = new MemoryStream())
using (FileStream file = new FileStream("file.bin", FileMode.Open, FileAccess.Read)) {
byte[] bytes = new byte[file.Length];
file.Read(bytes, 0, (int)file.Length);
ms.Write(bytes, 0, (int)file.Length);
}
In .Net Framework 4+, You can simply copy FileStream to MemoryStream and reverse as simple as this:
MemoryStream ms = new MemoryStream();
using (FileStream file = new FileStream("file.bin", FileMode.Open, FileAccess.Read))
file.CopyTo(ms);
And the Reverse (MemoryStream to FileStream):
using (FileStream file = new FileStream("file.bin", FileMode.Create, System.IO.FileAccess.Write))
ms.CopyTo(file);
Determine a string's encoding in C#
Another option, very late in coming, sorry:
http://www.architectshack.com/TextFileEncodingDetector.ashx
This small C#-only class uses BOMS if present, tries to auto-detect possible unicode encodings otherwise, and falls back if none of the Unicode encodings is possible or likely.
It sounds like UTF8Checker referenced above does something similar, but I think this is slightly broader in scope - instead of just UTF8, it also checks for other possible Unicode encodings (UTF-16 LE or BE) that might be missing a BOM.
Hope this helps someone!
How to add number of days to today's date?
This is for 5 days:
var myDate = new Date(new Date().getTime()+(5*24*60*60*1000));
You don't need JQuery, you can do it in JavaScript, Hope you get it.
How to add `style=display:"block"` to an element using jQuery?
$("#YourElementID").css("display","block");
Edit: or as dave thieben points out in his comment below, you can do this as well:
$("#YourElementID").css({ display: "block" });
Adding files to java classpath at runtime
Yes I believe it's possible but you might have to implement your own classloader. I have never done it but that is the path I would probably look at.
Rearrange columns using cut
Just been working on something very similar, I am not an expert but I thought I would share the commands I have used. I had a multi column csv which I only required 4 columns out of and then I needed to reorder them.
My file was pipe '|' delimited but that can be swapped out.
LC_ALL=C cut -d$'|' -f1,2,3,8,10 ./file/location.txt | sed -E "s/(.*)\|(.*)\|(.*)\|(.*)\|(.*)/\3\|\5\|\1\|\2\|\4/" > ./newcsv.csv
Admittedly it is really rough and ready but it can be tweaked to suit!
Deep copy vs Shallow Copy
Deep copy literally performs a deep copy. It means, that if your class has some fields that are references, their values will be copied, not references themselves. If, for example you have two instances of a class, A & B with fields of reference type, and perform a deep copy, changing a value of that field in A won't affect a value in B. And vise-versa. Things are different with shallow copy, because only references are copied, therefore, changing this field in a copied object would affect the original object.
What type of a copy does a copy constructor does?
It is implementation - dependent. This means that there are no strict rules about that, you can implement it like a deep copy or shallow copy, however as far as i know it is a common practice to implement a deep copy in a copy constructor. A default copy constructor performs a shallow copy though.
List of macOS text editors and code editors
I use Eclipse as my primary editor (for Python) but I always keep SubEthaEdit handy as my supplemental text editor (free trial, 30 euros to license). It's not super-complicated but it does what I need.
How to use the toString method in Java?
Whenever you access an Object (not being a String) in a String context then the toString() is called under the covers by the compiler.
This is why
Map map = new HashMap();
System.out.println("map=" + map);
works, and by overriding the standard toString() from Object in your own classes, you can make your objects useful in String contexts too.
(and consider it a black box! Never, ever use the contents for anything else than presenting to a human)
Why is the parent div height zero when it has floated children
Content that is floating does not influence the height of its container. The element contains no content that isn't floating (so nothing stops the height of the container being 0, as if it were empty).
Setting overflow: hidden on the container will avoid that by establishing a new block formatting context. See methods for containing floats for other techniques and containing floats for an explanation about why CSS was designed this way.
How to select a value in dropdown javascript?
Using some ES6:
Get the options first, filter the value based on the option and set the selected attribute to true.
window.onload = () => {_x000D_
_x000D_
Array.from(document.querySelector(`#Mobility`).options)_x000D_
.filter(x => x.value === "12")[0]_x000D_
.setAttribute('selected', true);_x000D_
_x000D_
};<select style="width: 280px" id="Mobility" name="Mobility">_x000D_
<option selected disabled>Please Select</option>_x000D_
<option>K</option>_x000D_
<option>1</option>_x000D_
<option>2</option>_x000D_
<option>3</option>_x000D_
<option>4</option>_x000D_
<option>5</option>_x000D_
<option>6</option>_x000D_
<option>7</option>_x000D_
<option>8</option>_x000D_
<option>9</option>_x000D_
<option>10</option>_x000D_
<option>11</option>_x000D_
<option>12</option>_x000D_
</select>Where is body in a nodejs http.get response?
http.request docs contains example how to receive body of the response through handling data event:
var options = {
host: 'www.google.com',
port: 80,
path: '/upload',
method: 'POST'
};
var req = http.request(options, function(res) {
console.log('STATUS: ' + res.statusCode);
console.log('HEADERS: ' + JSON.stringify(res.headers));
res.setEncoding('utf8');
res.on('data', function (chunk) {
console.log('BODY: ' + chunk);
});
});
req.on('error', function(e) {
console.log('problem with request: ' + e.message);
});
// write data to request body
req.write('data\n');
req.write('data\n');
req.end();
http.get does the same thing as http.request except it calls req.end() automatically.
var options = {
host: 'www.google.com',
port: 80,
path: '/index.html'
};
http.get(options, function(res) {
console.log("Got response: " + res.statusCode);
res.on("data", function(chunk) {
console.log("BODY: " + chunk);
});
}).on('error', function(e) {
console.log("Got error: " + e.message);
});
Android draw a Horizontal line between views
In each parent LinearLayout for which you want dividers between components, add android:divider="?android:dividerHorizontal" or android:divider="?android:dividerVertical.
Choose appropriate between them as per orientation of your LinearLayout.
Till I know, this resource style is added from Android 4.3.
Can I recover a branch after its deletion in Git?
If you don't have a reflog, eg. because you're working in a bare repository which does not have the reflog enabled and the commit you want to recover was created recently, another option is to find recently created commit objects and look through them.
From inside the .git/objects directory run:
find . -ctime -12h -type f | sed 's/[./]//g' | git cat-file --batch-check | grep commit
This finds all objects (commits, files, tags etc.) created in the last 12 hours and filters them to show only commits. Checking these is then a quick process.
I'd try the git-ressurect.sh script mentioned in Jakub's answer first though.
Ascending and Descending Number Order in java
Three possible solutions come to my mind:
1. Reverse the order:
//convert the arr to list first
Collections.reverse(listWithNumbers);
System.out.print("Numbers in Descending Order: " + listWithNumbers);
2. Iterate backwards and print it:
Arrays.sort(arr);
System.out.print("Numbers in Descending Order: " );
for(int i = arr.length - 1; i >= 0; i--){
System.out.print( " " +arr[i]);
}
3. Sort it with "oposite" comparator:
Arrays.sort(arr, new Comparator<Integer>(){
int compare(Integer i1, Integer i2) {
return i2 - i1;
}
});
// or Collections.reverseOrder(), could be used instead
System.out.print("Numbers in Descending Order: " );
for(int i = 0; i < arr.length; i++){
System.out.print( " " +arr[i]);
}
Chrome dev tools fails to show response even the content returned has header Content-Type:text/html; charset=UTF-8
One workaround is to use Postman with same request url, headers and payload.
It will give response for sure.
Git merge develop into feature branch outputs "Already up-to-date" while it's not
git fetch && git merge origin/develop
Center an element with "absolute" position and undefined width in CSS?
Responsive solution
Assuming the element in the div, is another div...
This solution works fine:
<div class="container">
<div class="center"></div>
</div>
The container can be any size (must be position relative):
.container {
position: relative; /* Important */
width: 200px; /* Any width */
height: 200px; /* Any height */
background: red;
}
The element (div) can also be any size (must be smaller than the container):
.center {
position: absolute; /* Important */
top: 50%; /* Position Y halfway in */
left: 50%; /* Position X halfway in */
transform: translate(-50%,-50%); /* Move it halfway back(x,y) */
width: 100px; /* Any width */
height: 100px; /* Any height */
background: blue;
}
The result will look like this. Run the code snippet:
.container {
position: relative;
width: 200px;
height: 200px;
background: red;
}
.center {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: 100px;
height: 100px;
background: blue;
}<div class="container">
<div class="center"></div>
</div>I found it very helpful.
How to turn on/off MySQL strict mode in localhost (xampp)?
I want to know how to check whether MySQL strict mode is on or off in localhost(xampp).
SHOW VARIABLES LIKE 'sql_mode';
If result has "STRICT_TRANS_TABLES", then it's ON. Otherwise, it's OFF.
If on then for what modes and how to off.
If off then how to on.
For Windows,
- Go to
C:\Program Files\MariaDB XX.X\data - Open the
my.inifile. - *On the line with "sql_mode", modify the value to turn strict mode ON/OFF.
- Save the file
- **Restart the MySQL service
- Run
SHOW VARIABLES LIKE 'sql_mode'again to see if it worked;
*3.a. To turn it ON, add STRICT_TRANS_TABLES on that line like this: sql_mode=STRICT_TRANS_TABLES. *If there are other values already, add a comma after this then join with the rest of the value.
*3.b. To turn it OFF, simply remove STRICT_TRANS_TABLES from value. *Remove the additional comma too if there is one.
**6. To restart the MySQL service on your computer,
- Open the Run command window (press WINDOWS + R button).
- Type
services.msc - Click
OK - Right click on the Name
MySQL - Click
Restart
uncaught syntaxerror unexpected token U JSON
I was getting this message while validating (in MVC project). For me, adding ValidationMessageFor element fixed the issue.
To be precise, line number 43 in jquery.validate.unobtrusive.js caused the issue:
replace = $.parseJSON(container.attr("data-valmsg-replace")) !== false;
is there something like isset of php in javascript/jQuery?
Not naturally, no... However, a googling of the thing gave this: http://phpjs.org/functions/isset:454
What is the default scope of a method in Java?
The default scope is package-private. All classes in the same package can access the method/field/class. Package-private is stricter than protected and public scopes, but more permissive than private scope.
More information:
http://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html
http://mindprod.com/jgloss/scope.html
Why does Boolean.ToString output "True" and not "true"
For Xml you can use XmlConvert.ToString method.
Oracle listener not running and won't start
In my Windows case the listener would not start, and 'lsnrctl start' would hang forever. The solution was to kill all processes of extproc. I suspect it had something funny to do with my vpn
..The underlying connection was closed: An unexpected error occurred on a receive
None of the solutions out there worked for me. What I eventually discovered was the following combination:
- Client system: Windows XP Pro SP3
- Client system has .NET Framework 2 SP1, 3, 3.5 installed
- Software targeting .NET 2 using classic web services (.asmx)
- Server: IIS6
- Web site "Secure Communications" set to:
- Require Secure Channel
- Accept client certificates
Apparently, it was this last option that was causing the issue. I discovered this by trying to open the web service URL directly in Internet Explorer. It just hung indefinitely trying to load the page. Disabling "Accept client certificates" allowed the page to load normally. I am not sure if it was a problem with this specific system (maybe a glitched client certificate?) Since I wasn't using client certificates this option worked for me.
Regex pattern to match at least 1 number and 1 character in a string
And an idea with a negative check.
/^(?!\d*$|[a-z]*$)[a-z\d]+$/i
^(?!at start look ahead if string does not\d*$contain only digits|or[a-z]*$contain only letters[a-z\d]+$matches one or more letters or digits until$end.
Have a look at this regex101 demo
(the i flag turns on caseless matching: a-z matches a-zA-Z)
What is the maximum length of a Push Notification alert text?
The limit of the enhanced format notifications is documented here.
It explicitly states:
The payload must not exceed 256 bytes and must not be null-terminated.
ascandroli claims above that they were able to send messages with 1400 characters. My own testing with the new notification format showed that a message just 1 byte over the 256 byte limit was rejected. Given that the docs are very explicit on this point I suggest it is safer to use 256 regardless of what you may be able to achieve experimentally as there is no guarantee Apple won't change it to 256 in the future.
As for the alert text itself, if you can fit it in the 256 total payload size then it will be displayed by iOS. They truncate the message that shows up on the status bar, but if you open the notification center, the entire message is there. It even renders newline characters \n.
How can we run a test method with multiple parameters in MSTest?
I couldn't get The DataRowAttribute to work in Visual Studio 2015, and this is what I ended up with:
[TestClass]
public class Tests
{
private Foo _toTest;
[TestInitialize]
public void Setup()
{
this._toTest = new Foo();
}
[TestMethod]
public void ATest()
{
this.Perform_ATest(1, 1, 2);
this.Setup();
this.Perform_ATest(100, 200, 300);
this.Setup();
this.Perform_ATest(817001, 212, 817213);
this.Setup();
}
private void Perform_ATest(int a, int b, int expected)
{
// Obviously this would be way more complex...
Assert.IsTrue(this._toTest.Add(a,b) == expected);
}
}
public class Foo
{
public int Add(int a, int b)
{
return a + b;
}
}
The real solution here is to just use NUnit (unless you're stuck in MSTest like I am in this particular instance).
How to get a JavaScript object's class?
I suggest using Object.prototype.constructor.name:
Object.defineProperty(Object.prototype, "getClass", {
value: function() {
return this.constructor.name;
}
});
var x = new DOMParser();
console.log(x.getClass()); // `DOMParser'
var y = new Error("");
console.log(y.getClass()); // `Error'
Alphanumeric, dash and underscore but no spaces regular expression check JavaScript
Don't escape the underscore. Might be causing some whackness.
API pagination best practices
Another option for Pagination in RESTFul APIs, is to use the Link header introduced here. For example Github use it as follow:
Link: <https://api.github.com/user/repos?page=3&per_page=100>; rel="next",
<https://api.github.com/user/repos?page=50&per_page=100>; rel="last"
The possible values for rel are: first, last, next, previous. But by using Link header, it may be not possible to specify total_count (total number of elements).
htaccess Access-Control-Allow-Origin
The other answers didn't work for me, this is what ended up doing the trick for apache2:
1) Enable the headers mod:
sudo a2enmod headers
2) Create the /etc/apache2/mods-enabled/headers.conf file and insert:
<IfModule mod_headers.c>
Header set Access-Control-Allow-Origin "*"
</IfModule>
3) Restart your server:
sudo service apache2 restart
How do I determine file encoding in OS X?
Using file command with the --mime-encoding option (e.g. file --mime-encoding some_file.txt) instead of the -I option works on OS X and has the added benefit of omitting the mime type, "text/plain", which you probably don't care about.
Implement specialization in ER diagram
So I assume your permissions table has a foreign key reference to admin_accounts table. If so because of referential integrity you will only be able to add permissions for account ids exsiting in the admin accounts table. Which also means that you wont be able to enter a user_account_id [assuming there are no duplicates!]
What online brokers offer APIs?
Only related with currency trading (Forex), but many Forex brokers are offering MetaTrader which let you code in MQL. The main problem with it (aside that it's limited to Forex) is that you've to code in MQL which might not be your preferred language.
Dynamically add data to a javascript map
Javascript now has a specific built in object called Map, you can call as follows :
var myMap = new Map()
You can update it with .set :
myMap.set("key0","value")
This has the advantage of methods you can use to handle look ups, like the boolean .has
myMap.has("key1"); // evaluates to false
You can use this before calling .get on your Map object to handle looking up non-existent keys
JS regex: replace all digits in string
You forgot to add the global operator. Use this:
var s = "04.07.2012";_x000D_
alert(s.replace(new RegExp("[0-9]","g"), "X")); dplyr change many data types
It's a one-liner with mutate_at:
dat %>% mutate_at("l1", factor) %>% mutate_at("l2", as.numeric)
How can I convert a Timestamp into either Date or DateTime object?
java.sql.Timestamp is a subclass of java.util.Date. So, just upcast it.
Date dtStart = resultSet.getTimestamp("dtStart");
Date dtEnd = resultSet.getTimestamp("dtEnd");
Using SimpleDateFormat and creating Joda DateTime should be straightforward from this point on.
How to get the selected item of a combo box to a string variable in c#
SelectedText = this.combobox.SelectionBoxItem.ToString();
How to convert a date string to different format
If you can live with 01 for January instead of 1, then try...
d = datetime.datetime.strptime("2013-1-25", '%Y-%m-%d')
print datetime.date.strftime(d, "%m/%d/%y")
You can check the docs for other formatting directives.
Avoid Adding duplicate elements to a List C#
If you don't want duplicates in a list, use a HashSet. That way it will be clear to anyone else reading your code what your intention was and you'll have less code to write since HashSet already handles what you are trying to do.
The server is not responding (or the local MySQL server's socket is not correctly configured) in wamp server
mysql default port is 3306 can you try putting it and then try
"The page has expired due to inactivity" - Laravel 5.5
Some information is stored in the cookie which is related to previous versions of laravel in development. So it's conflicting with csrf generated tokens which are generated by another's versions. Just Clear the cookie and give a try.
Load HTML page dynamically into div with jQuery
I think you are looking for the Jquery Load function. You would just use that function with an onclick function tied to the a tag or a button if you like.
Conversion from Long to Double in Java
I think it is good for you.
BigDecimal.valueOf([LONG_VALUE]).doubleValue()
How about this code? :D
Nested rows with bootstrap grid system?
Bootstrap Version 3.x
As always, read Bootstrap's great documentation:
3.x Docs: https://getbootstrap.com/docs/3.3/css/#grid-nesting
Make sure the parent level row is inside of a .container element. Whenever you'd like to nest rows, just open up a new .row inside of your column.
Here's a simple layout to work from:
<div class="container">
<div class="row">
<div class="col-xs-6">
<div class="big-box">image</div>
</div>
<div class="col-xs-6">
<div class="row">
<div class="col-xs-6"><div class="mini-box">1</div></div>
<div class="col-xs-6"><div class="mini-box">2</div></div>
<div class="col-xs-6"><div class="mini-box">3</div></div>
<div class="col-xs-6"><div class="mini-box">4</div></div>
</div>
</div>
</div>
</div>
Bootstrap Version 4.0
4.0 Docs: http://getbootstrap.com/docs/4.0/layout/grid/#nesting
Here's an updated version for 4.0, but you should really read the entire docs section on the grid so you understand how to leverage this powerful feature
<div class="container">
<div class="row">
<div class="col big-box">
image
</div>
<div class="col">
<div class="row">
<div class="col mini-box">1</div>
<div class="col mini-box">2</div>
</div>
<div class="row">
<div class="col mini-box">3</div>
<div class="col mini-box">4</div>
</div>
</div>
</div>
</div>
Demo in Fiddle jsFiddle 3.x | jsFiddle 4.0
Which will look like this (with a little bit of added styling):
Create a zip file and download it
I just ran into this problem. For me the issue was with:
readfile("$archive_file_name");
It was resulting in a out of memory error.
Allowed memory size of 134217728 bytes exhausted (tried to allocate 292982784 bytes)
I was able to correct the problem by replacing readfile() with the following:
$handle = fopen($zipPath, "rb");
while (!feof($handle)){
echo fread($handle, 8192);
}
fclose($handle);
Not sure if this is your same issue or not seeing that your file is only 1.2 MB. Maybe this will help someone else with a similar problem.
How to set the title text color of UIButton?
func setTitleColor(_ color: UIColor?, for state: UIControl.State)
Parameters:
color:
The color of the title to use for the specified state.state:
The state that uses the specified color. The possible values are described in UIControl.State.
Sample:
let MyButton = UIButton()
MyButton.setTitle("Click Me..!", for: .normal)
MyButton.setTitleColor(.green, for: .normal)
Convert byte slice to io.Reader
r := strings(byteData)
This also works to turn []byte into io.Reader
Check if String / Record exists in DataTable
You can loop over each row of the DataTable and check the value.
I'm a big fan of using a foreach loop when using IEnumerables. Makes it very simple and clean to look at or process each row
DataTable dtPs = // ... initialize your DataTable
foreach (DataRow dr in dtPs.Rows)
{
if (dr["item_manuf_id"].ToString() == "some value")
{
// do your deed
}
}
Alternatively you can use a PrimaryKey for your DataTable. This helps in various ways, but you often need to define one before you can use it.
An example of using one if at http://msdn.microsoft.com/en-us/library/z24kefs8(v=vs.80).aspx
DataTable workTable = new DataTable("Customers");
// set constraints on the primary key
DataColumn workCol = workTable.Columns.Add("CustID", typeof(Int32));
workCol.AllowDBNull = false;
workCol.Unique = true;
workTable.Columns.Add("CustLName", typeof(String));
workTable.Columns.Add("CustFName", typeof(String));
workTable.Columns.Add("Purchases", typeof(Double));
// set primary key
workTable.PrimaryKey = new DataColumn[] { workTable.Columns["CustID"] };
Once you have a primary key defined and data populated, you can use the Find(...) method to get the rows that match your primary key.
Take a look at http://msdn.microsoft.com/en-us/library/y06xa2h1(v=vs.80).aspx
DataRow drFound = dtPs.Rows.Find("some value");
if (drFound["item_manuf_id"].ToString() == "some value")
{
// do your deed
}
Finally, you can use the Select() method to find data within a DataTable also found at at http://msdn.microsoft.com/en-us/library/y06xa2h1(v=vs.80).aspx.
String sExpression = "item_manuf_id == 'some value'";
DataRow[] drFound;
drFound = dtPs.Select(sExpression);
foreach (DataRow dr in drFound)
{
// do you deed. Each record here was already found to match your criteria
}
Show hidden div on ng-click within ng-repeat
Remove the display:none, and use ng-show instead:
<ul class="procedures">
<li ng-repeat="procedure in procedures | filter:query | orderBy:orderProp">
<h4><a href="#" ng-click="showDetails = ! showDetails">{{procedure.definition}}</a></h4>
<div class="procedure-details" ng-show="showDetails">
<p>Number of patient discharges: {{procedure.discharges}}</p>
<p>Average amount covered by Medicare: {{procedure.covered}}</p>
<p>Average total payments: {{procedure.payments}}</p>
</div>
</li>
</ul>
Here's the fiddle: http://jsfiddle.net/asmKj/
You can also use ng-class to toggle a class:
<div class="procedure-details" ng-class="{ 'hidden': ! showDetails }">
I like this more, since it allows you to do some nice transitions: http://jsfiddle.net/asmKj/1/