What is Activity.finish() method doing exactly?
My study shows that finish() method actually places some destruction operations in the queue, but the Activity is not destroyed immediately. The destruction is scheduled though.
For example, if you place finish() in onActivityResult() callback, while onResume() has yet to run, then first onResume() will be executed, and only after that onStop() and onDestroy() are called.
NOTE: onDestroy() may not be called at all, as stated on the documentation.
How do you resize a form to fit its content automatically?
This might be useful. It resizes a new form to a user control, and then anchors the user control to the new form:
Form f = new Form();
MyUserControl muc = new MyUserControl();
f.ClientSize = muc.Size;
f.Controls.Add(muc);
muc.Anchor = AnchorStyles.Top | AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right;
f.ShowDialog();
How can I pad an integer with zeros on the left?
You need to use a Formatter, following code uses NumberFormat
int inputNo = 1;
NumberFormat nf = NumberFormat.getInstance();
nf.setMaximumIntegerDigits(4);
nf.setMinimumIntegerDigits(4);
nf.setGroupingUsed(false);
System.out.println("Formatted Integer : " + nf.format(inputNo));
Output: 0001
How to install JQ on Mac by command-line?
For CentOS, RHEL, Amazon Linux: sudo yum install jq
How to get cookie expiration date / creation date from javascript?
Yes, It is possible. I've separated the code in two files:
index.php
<?php
$time = time()+(60*60*24*10);
$timeMemo = (string)$time;
setcookie("cookie", "" . $timeMemo . "", $time);
?>
<html>
<head>
<title>
Get cookie expiration date from JS
</title>
<script type="text/javascript">
function cookieExpirationDate(){
var infodiv = document.getElementById("info");
var xmlhttp;
if (window.XMLHttpRequest){
xmlhttp = new XMLHttpRequest;
}else{
xmlhttp = new ActiveXObject(Microsoft.XMLHTTP);
}
xmlhttp.onreadystatechange = function (){
if(xmlhttp.readyState == 4 && xmlhttp.status == 200){
infodiv.innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "cookie.php", true);
xmlhttp.send();
}
</script>
</head>
<body>
<input type="button" onclick="javascript:cookieExpirationDate();" value="Get Cookie expire date" />
<hr />
<div id="info">
</div>
</body>
</html>
cookie.php
<?php
function secToDays($sec){
return ($sec / 60 / 60 / 24);
}
if(isset($_COOKIE['cookie'])){
if(round(secToDays((intval($_COOKIE['cookie']) - time())),1) < 1){
echo "Cookie will expire today";
}else{
echo "Cookie will expire in " . round(secToDays((intval($_COOKIE['cookie']) - time())),1) . " day(s)";
}
}else{
echo "Cookie not set...";
}
?>
Now, index.php must be loaded once. The button "Get Cookie expire date", thru an AJAX request, will always get you an updated "time left" for cookie expiration, in this case in days.
Working with time DURATION, not time of day
Use format d "days" h:mm:ss or [h]:mm:ss, depending on your needs.
Say you have a duration of 30h 12m 54s:
h:mm:ss-> 6:12:54 (not correct for a duration)[h]:mm:ss-> 30:12:54d "days" h:mm:ss-> 1 days 6:12:54
Variations are possible: I like something like d"d" h"h" mm"m" ss"s" which formats as 1d 6h 12m 54s.
Converting string to tuple without splitting characters
Just in case someone comes here trying to know how to create a tuple assigning each part of the string "Quattro" and "TT" to an element of the list, it would be like this
print tuple(a.split())
MySQL - Replace Character in Columns
Replace below characters
~ ! @ # $ % ^ & * ( ) _ +
` - =
{ } |
[ ] \
: "
; '
< > ?
, .
with this SQL
SELECT note as note_original,
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(
REPLACE(note, '\"', ''),
'.', ''),
'?', ''),
'`', ''),
'<', ''),
'=', ''),
'{', ''),
'}', ''),
'[', ''),
']', ''),
'|', ''),
'\'', ''),
':', ''),
';', ''),
'~', ''),
'!', ''),
'@', ''),
'#', ''),
'$', ''),
'%', ''),
'^', ''),
'&', ''),
'*', ''),
'_', ''),
'+', ''),
',', ''),
'/', ''),
'(', ''),
')', ''),
'-', ''),
'>', ''),
' ', '-'),
'--', '-') as note_changed FROM invheader
How to make the 'cut' command treat same sequental delimiters as one?
Try:
tr -s ' ' <text.txt | cut -d ' ' -f4
From the tr man page:
-s, --squeeze-repeats replace each input sequence of a repeated character
that is listed in SET1 with a single occurrence
of that character
jackson deserialization json to java-objects
It looks like you are trying to read an object from JSON that actually describes an array. Java objects are mapped to JSON objects with curly braces {} but your JSON actually starts with square brackets [] designating an array.
What you actually have is a List<product> To describe generic types, due to Java's type erasure, you must use a TypeReference. Your deserialization could read: myProduct = objectMapper.readValue(productJson, new TypeReference<List<product>>() {});
A couple of other notes: your classes should always be PascalCased. Your main method can just be public static void main(String[] args) throws Exception which saves you all the useless catch blocks.
SQL ORDER BY date problem
Unsure what dbms you're using however I'd do it this way in Microsoft SQL:
select [date]
from tbemp
order by cast([date] as datetime) asc
How to transfer paid android apps from one google account to another google account
It's totally feasible now. Google now allow you to transfer Android apps between accounts. Please take a look at this link: https://support.google.com/googleplay/android-developer/checklist/3294213?hl=en
Concatenate two slices in Go
Nothing against the other answers, but I found the brief explanation in the docs more easily understandable than the examples in them:
func append
func append(slice []Type, elems ...Type) []TypeThe append built-in function appends elements to the end of a slice. If it has sufficient capacity, the destination is resliced to accommodate the new elements. If it does not, a new underlying array will be allocated. Append returns the updated slice. It is therefore necessary to store the result of append, often in the variable holding the slice itself:slice = append(slice, elem1, elem2) slice = append(slice, anotherSlice...)As a special case, it is legal to append a string to a byte slice, like this:
slice = append([]byte("hello "), "world"...)
Using Razor within JavaScript
A simple and a good straight-forward example:
<script>
// This gets the username from the Razor engine and puts it
// in JavaScript to create a variable I can access from the
// client side.
//
// It's an odd workaraound, but it works.
@{
var outScript = "var razorUserName = " + "\"" + @User.Identity.Name + "\"";
}
@MvcHtmlString.Create(outScript);
</script>
This creates a script in your page at the location you place the code above which looks like the following:
<script>
// This gets the username from the Razor engine and puts it
// in JavaScript to create a variable I can access from
// client side.
//
// It's an odd workaraound, but it works.
var razorUserName = "daylight";
</script>
Now you have a global JavaScript variable named razorUserName which you can access and use on the client. The Razor engine has obviously extracted the value from @User.Identity.Name (server-side variable) and put it in the code it writes to your script tag.
MySQL: Can't create/write to file '/tmp/#sql_3c6_0.MYI' (Errcode: 2) - What does it even mean?
For those using VPS / virtual hosting.
I was using a VPS, getting errors with MySQL not being able to write to /tmp, and everything looked correct. I had enough free space, enough free inodes, correct permissions. Turned out the problem was outside my VPS, it was the machine hosting the VPS that was full. I only had "virtual space" in my file system, but the machine in the background which hosted the VPS had no "physical space" left. I had to contact the VPS company any they fixed it.
If you think this might be your problem, you could test writing a larger file to /tmp (1GB):
dd if=/dev/zero of=/tmp/file.txt count=1024 bs=1048576
I got a No space left on device error message, which was a giveaway that it was a disk/volume in the background that was full.
Error: Could not find or load main class
I was using Java 1.8, and this error suddenly occurred when I pressed "Build and clean" in NetBeans. I switched for a brief moment to 1.7 again, clicked OK, re-opened properties and switched back to 1.8, and everything worked perfectly.
I hope I can help someone out with this, as these errors can be quite time-consuming.
How to format dateTime in django template?
This is exactly what you want. Try this:
{{ wpis.entry.lastChangeDate|date:'Y-m-d H:i' }}
Center the content inside a column in Bootstrap 4
.row>.col, .row>[class^=col-] {_x000D_
padding-top: .75rem;_x000D_
padding-bottom: .75rem;_x000D_
background-color: rgba(86,61,124,.15);_x000D_
border: 1px solid rgba(86,61,124,.2);_x000D_
}<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"/>_x000D_
<div class="container">_x000D_
<div class="row justify-content-md-center">_x000D_
<div class="col col-lg-2">_x000D_
1 of 3_x000D_
</div>_x000D_
<div class="col col-lg-2">_x000D_
1 of 2_x000D_
</div>_x000D_
<div class="col col-lg-2">_x000D_
3 of 3_x000D_
</div>_x000D_
</div>_x000D_
</div>What is an "index out of range" exception, and how do I fix it?
Why does this error occur?
Because you tried to access an element in a collection, using a numeric index that exceeds the collection's boundaries.
The first element in a collection is generally located at index 0. The last element is at index n-1, where n is the Size of the collection (the number of elements it contains). If you attempt to use a negative number as an index, or a number that is larger than Size-1, you're going to get an error.
How indexing arrays works
When you declare an array like this:
var array = new int[6]
The first and last elements in the array are
var firstElement = array[0];
var lastElement = array[5];
So when you write:
var element = array[5];
you are retrieving the sixth element in the array, not the fifth one.
Typically, you would loop over an array like this:
for (int index = 0; index < array.Length; index++)
{
Console.WriteLine(array[index]);
}
This works, because the loop starts at zero, and ends at Length-1 because index is no longer less than Length.
This, however, will throw an exception:
for (int index = 0; index <= array.Length; index++)
{
Console.WriteLine(array[index]);
}
Notice the <= there? index will now be out of range in the last loop iteration, because the loop thinks that Length is a valid index, but it is not.
How other collections work
Lists work the same way, except that you generally use Count instead of Length. They still start at zero, and end at Count - 1.
for (int index = 0; i < list.Count; index++)
{
Console.WriteLine(list[index]);
}
However, you can also iterate through a list using foreach, avoiding the whole problem of indexing entirely:
foreach (var element in list)
{
Console.WriteLine(element.ToString());
}
You cannot index an element that hasn't been added to a collection yet.
var list = new List<string>();
list.Add("Zero");
list.Add("One");
list.Add("Two");
Console.WriteLine(list[3]); // Throws exception.
How to refresh an access form
I recommend that you use REQUERY the specific combo box whose data you have changed AND that you do it after the Cmd.Close statement. that way, if you were inputing data, that data is also requeried.
DoCmd.Close
Forms![Form_Name]![Combo_Box_Name].Requery
you might also want to point to the recently changed value
Dim id As Integer
id = Me.[Index_Field]
DoCmd.Close
Forms![Form_Name]![Combo_Box_Name].Requery
Forms![Form_Name]![Combo_Box_Name] = id
this example supposes that you opened a form to input data into a secondary table.
let us say you save School_Index and School_Name in a School table and refer to it in a Student table (which contains only the School_Index field). while you are editing a student, you need to associate him with a school that is not in your School table, etc etc
How do I detect if software keyboard is visible on Android Device or not?
Try this code it's really working if KeyboardShown is Shown then this function return true value....
private final String TAG = "TextEditor";
private TextView mTextEditor;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_editor);
mTextEditor = (TextView) findViewById(R.id.text_editor);
mTextEditor.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
isKeyboardShown(mTextEditor.getRootView());
}
});
}
private boolean isKeyboardShown(View rootView) {
/* 128dp = 32dp * 4, minimum button height 32dp and generic 4 rows soft keyboard */
final int SOFT_KEYBOARD_HEIGHT_DP_THRESHOLD = 128;
Rect r = new Rect();
rootView.getWindowVisibleDisplayFrame(r);
DisplayMetrics dm = rootView.getResources().getDisplayMetrics();
/* heightDiff = rootView height - status bar height (r.top) - visible frame height (r.bottom - r.top) */
int heightDiff = rootView.getBottom() - r.bottom;
/* Threshold size: dp to pixels, multiply with display density */
boolean isKeyboardShown = heightDiff > SOFT_KEYBOARD_HEIGHT_DP_THRESHOLD * dm.density;
Log.d(TAG, "isKeyboardShown ? " + isKeyboardShown + ", heightDiff:" + heightDiff + ", density:" + dm.density
+ "root view height:" + rootView.getHeight() + ", rect:" + r);
return isKeyboardShown;
}
How to split a String by space
Not only white space, but my solution also solves the invisible characters as well.
str = "Hello I'm your String";
String[] splited = str.split("\p{Z}");
Cross-browser window resize event - JavaScript / jQuery
Besides the window resize functions mentioned it is important to understand that the resize events fire a lot if used without a deboucing the events.
Paul Irish has an excellent function that debounces the resize calls a great deal. Very recommended to use. Works cross-browser. Tested it in IE8 the other day and all was fine.
http://www.paulirish.com/2009/throttled-smartresize-jquery-event-handler/
Make sure to check out the demo to see the difference.
Here is the function for completeness.
(function($,sr){
// debouncing function from John Hann
// http://unscriptable.com/index.php/2009/03/20/debouncing-javascript-methods/
var debounce = function (func, threshold, execAsap) {
var timeout;
return function debounced () {
var obj = this, args = arguments;
function delayed () {
if (!execAsap)
func.apply(obj, args);
timeout = null;
};
if (timeout)
clearTimeout(timeout);
else if (execAsap)
func.apply(obj, args);
timeout = setTimeout(delayed, threshold || 100);
};
}
// smartresize
jQuery.fn[sr] = function(fn){ return fn ? this.bind('resize', debounce(fn)) : this.trigger(sr); };
})(jQuery,'smartresize');
// usage:
$(window).smartresize(function(){
// code that takes it easy...
});
To draw an Underline below the TextView in Android
For anyone still looking at this querstion. This is for a hyperlink but you can modify it for just a plain underline:
Create a drawable (hyperlink_underline.xml):
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:top="-10dp"
android:left="-10dp"
android:right="-10dp">
<shape android:shape="rectangle">
<solid android:color="@android:color/transparent"/>
<stroke android:width="2dp"
android:color="#3498db"/>
</shape>
</item>
</layer-list>
Create a new style:
<style name="Hyperlink">
<item name="android:textColor">#3498db</item>
<item name="android:background">@drawable/hyperlink_underline</item>
</style>
Then use this style on your TextView:
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
local:MvxBind="Text Id; Click ShowJobInfoCommand"
style="@style/HyperLink"/>
Proxy with express.js
I used the following setup to direct everything on /rest to my backend server (on port 8080), and all other requests to the frontend server (a webpack server on port 3001). It supports all HTTP-methods, doesn't lose any request meta-info and supports websockets (which I need for hot reloading)
var express = require('express');
var app = express();
var httpProxy = require('http-proxy');
var apiProxy = httpProxy.createProxyServer();
var backend = 'http://localhost:8080',
frontend = 'http://localhost:3001';
app.all("/rest/*", function(req, res) {
apiProxy.web(req, res, {target: backend});
});
app.all("/*", function(req, res) {
apiProxy.web(req, res, {target: frontend});
});
var server = require('http').createServer(app);
server.on('upgrade', function (req, socket, head) {
apiProxy.ws(req, socket, head, {target: frontend});
});
server.listen(3000);
Mockito - difference between doReturn() and when()
The latter alternative is used for methods on mocks that return void.
Please have a look, for example, here: How to make mock to void methods with mockito
char initial value in Java
Either you initialize the variable to something
char retChar = 'x';
or you leave it automatically initialized, which is
char retChar = '\0';
an ascii 0, the same as
char retChar = (char) 0;
What can one initialize char values to?
Sounds undecided between automatic initialisation, which means, you have no influence, or explicit initialisation. But you cannot change the default.
Simple JavaScript problem: onClick confirm not preventing default action
There's a typo in your code (the tag a is closed too early). You can either use:
<a href="whatever" onclick="return confirm('are you sure?')"><img ...></a>
note the return (confirm): the value returned by scripts in intrinsic evens decides whether the default browser action is run or not; in case you need to run a big piece of code you can of course call another function:
<script type="text/javascript">
function confirm_delete() {
return confirm('are you sure?');
}
</script>
...
<a href="whatever" onclick="return confirm_delete()"><img ...></a>
(note that delete is a keyword)
For completeness: modern browsers also support DOM events, allowing you to register more than one handler for the same event on each object, access the details of the event, stop the propagation and much more; see DOM Events.
Using Gulp to Concatenate and Uglify files
Solution using gulp-uglify, gulp-concat and gulp-sourcemaps. This is from a project I'm working on.
gulp.task('scripts', function () {
return gulp.src(scripts, {base: '.'})
.pipe(plumber(plumberOptions))
.pipe(sourcemaps.init({
loadMaps: false,
debug: debug,
}))
.pipe(gulpif(debug, wrapper({
header: fileHeader,
})))
.pipe(concat('all_the_things.js', {
newLine:'\n;' // the newline is needed in case the file ends with a line comment, the semi-colon is needed if the last statement wasn't terminated
}))
.pipe(uglify({
output: { // http://lisperator.net/uglifyjs/codegen
beautify: debug,
comments: debug ? true : /^!|\b(copyright|license)\b|@(preserve|license|cc_on)\b/i,
},
compress: { // http://lisperator.net/uglifyjs/compress, http://davidwalsh.name/compress-uglify
sequences: !debug,
booleans: !debug,
conditionals: !debug,
hoist_funs: false,
hoist_vars: debug,
warnings: debug,
},
mangle: !debug,
outSourceMap: true,
basePath: 'www',
sourceRoot: '/'
}))
.pipe(sourcemaps.write('.', {
includeContent: true,
sourceRoot: '/',
}))
.pipe(plumber.stop())
.pipe(gulp.dest('www/js'))
});
This combines and compresses all your scripts, puts them into a file called all_the_things.js. The file will end with a special line
//# sourceMappingURL=all_the_things.js.map
Which tells your browser to look for that map file, which it also writes out.
How to start automatic download of a file in Internet Explorer?
Back to the roots, i use this:
<meta http-equiv="refresh" content="0; url=YOURFILEURL"/>
Maybe not WC3 conform but works perfect on all browsers, no HTML5/JQUERY/Javascript.
Greetings Tom :)
Combating AngularJS executing controller twice
Been scratching my head over this problem with AngularJS 1.4 rc build, then realised none of the above answers was applicable since it was originated from the new router library for Angular 1.4 and Angular 2 at the time of this writing. Therefore, I am dropping a note here for anyone who might be using the new Angular route library.
Basically if a html page contains a ng-viewport directive for loading parts of your app, by clicking on a hyperlink specified in with ng-link would cause the target controller of the associated component to be loaded twice. The subtle difference is that, if the browser has already loaded the target controller, by re-clicking the same hyperlink would only invoke the controller once.
Haven't found a viable workaround yet, though I believe this behaviour is consistent with the observation raised by shaunxu, and hopefully this issue would be resolved in the future build of new route library and along with AngularJS 1.4 releases.
Describe table structure
Sql server
DECLARE @tableName nvarchar(100)
SET @tableName = N'members' -- change with table name
SELECT
[column].*,
COLUMNPROPERTY(object_id([column].[TABLE_NAME]), [column].[COLUMN_NAME], 'IsIdentity') AS [identity]
FROM
INFORMATION_SCHEMA.COLUMNS [column]
WHERE
[column].[Table_Name] = @tableName
Excel - Combine multiple columns into one column
I created an example spreadsheet here of how to do this with simple Excel formulae, and without use of macros (you will need to make your own adjustments for getting rid of the first row, but this should be easy once you figure out how my example spreadsheet works):
Can you autoplay HTML5 videos on the iPad?
As of iOS 10, videos now can autoplay, but only of they are either muted, or have no audio track. Yay!
In short:
<video autoplay>elements will now honor the autoplay attribute, for elements which meet the following conditions:<video>elements will be allowed to autoplay without a user gesture if their source media contains no audio tracks.<video muted>elements will also be allowed to autoplay without a user gesture.- If a
<video>element gains an audio track or becomes un-muted without a user gesture, playback will pause. <video autoplay>elements will only begin playing when visible on-screen such as when they are scrolled into the viewport, made visible through CSS, and inserted into the DOM.<video autoplay>elements will pause if they become non-visible, such as by being scrolled out of the viewport.
More info here: https://webkit.org/blog/6784/new-video-policies-for-ios/
what's the default value of char?
The default value of a char data type is '\u0000' (or 0) and a maximum value of '\uffff' (or 65,535 inclusive).
You can see the info here.
Removing duplicate objects with Underscore for Javascript
When I have an attribute id, this is my preffered way in underscore:
var x = [{i:2}, {i:2, x:42}, {i:4}, {i:3}];
_.chain(x).indexBy("i").values().value();
// > [{i:2, x:42}, {i:4}, {i:3}]
Regular Expression - 2 letters and 2 numbers in C#
This should get you for starting with two letters and ending with two numbers.
[A-Za-z]{2}(.*)[0-9]{2}
If you know it will always be just two and two you can
[A-Za-z]{2}[0-9]{2}
CMake link to external library
One more alternative, in the case you are working with the Appstore, need "Entitlements" and as such need to link with an Apple-Framework.
For Entitlements to work (e.g. GameCenter) you need to have a "Link Binary with Libraries"-buildstep and then link with "GameKit.framework". CMake "injects" the libraries on a "low level" into the commandline, hence Xcode doesn't really know about it, and as such you will not get GameKit enabled in the Capabilities screen.
One way to use CMake and have a "Link with Binaries"-buildstep is to generate the xcodeproj with CMake, and then use 'sed' to 'search & replace' and add the GameKit in the way XCode likes it...
The script looks like this (for Xcode 6.3.1).
s#\/\* Begin PBXBuildFile section \*\/#\/\* Begin PBXBuildFile section \*\/\
26B12AA11C10544700A9A2BA \/\* GameKit.framework in Frameworks \*\/ = {isa = PBXBuildFile; fileRef = 26B12AA01C10544700A9A2BA \/\* GameKit.framework xxx\*\/; };#g
s#\/\* Begin PBXFileReference section \*\/#\/\* Begin PBXFileReference section \*\/\
26B12AA01C10544700A9A2BA \/\* GameKit.framework xxx\*\/ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = GameKit.framework; path = System\/Library\/Frameworks\/GameKit.framework; sourceTree = SDKROOT; };#g
s#\/\* End PBXFileReference section \*\/#\/\* End PBXFileReference section \*\/\
\
\/\* Begin PBXFrameworksBuildPhase section \*\/\
26B12A9F1C10543B00A9A2BA \/\* Frameworks \*\/ = {\
isa = PBXFrameworksBuildPhase;\
buildActionMask = 2147483647;\
files = (\
26B12AA11C10544700A9A2BA \/\* GameKit.framework in Frameworks xxx\*\/,\
);\
runOnlyForDeploymentPostprocessing = 0;\
};\
\/\* End PBXFrameworksBuildPhase section \*\/\
#g
s#\/\* CMake PostBuild Rules \*\/,#\/\* CMake PostBuild Rules \*\/,\
26B12A9F1C10543B00A9A2BA \/\* Frameworks xxx\*\/,#g
s#\/\* Products \*\/,#\/\* Products \*\/,\
26B12AA01C10544700A9A2BA \/\* GameKit.framework xxx\*\/,#g
save this to "gamecenter.sed" and then "apply" it like this ( it changes your xcodeproj! )
sed -i.pbxprojbak -f gamecenter.sed myproject.xcodeproj/project.pbxproj
You might have to change the script-commands to fit your need.
Warning: it's likely to break with different Xcode-version as the project-format could change, the (hardcoded) unique number might not really by unique - and generally the solutions by other people are better - so unless you need to Support the Appstore + Entitlements (and automated builds), don't do this.
This is a CMake bug, see http://cmake.org/Bug/view.php?id=14185 and http://gitlab.kitware.com/cmake/cmake/issues/14185
How to open URL in Microsoft Edge from the command line?
While the accepted answer is correct, it has the unwanted artifact of flashing a console window when running from a non-console application.
The solution I found works best, which is only mentioned here in a comments to the question, is the following command line:
explorer.exe "microsoft-edge:<URL>"
Keep in mind that if contains the % sign you will need to type %% as Windows uses the symbol for variable expansion.
Hope someone finds this helpful.
php $_POST array empty upon form submission
In addition to MRMage's post:
I had to set this variable to solve the problem that some $_POST variables (with an large array > 1000 items) disappeared:
suhosin.request.max_vars = 2500
"request", not "post" was the solution...
Query to display all tablespaces in a database and datafiles
If you want to get a list of all tablespaces used in the current database instance, you can use the DBA_TABLESPACES view as shown in the following SQL script example:
SQL> connect SYSTEM/fyicenter
Connected.
SQL> SELECT TABLESPACE_NAME, STATUS, CONTENTS
2 FROM USER_TABLESPACES;
TABLESPACE_NAME STATUS CONTENTS
------------------------------ --------- ---------
SYSTEM ONLINE PERMANENT
UNDO ONLINE UNDO
SYSAUX ONLINE PERMANENT
TEMP ONLINE TEMPORARY
USERS ONLINE PERMANENT
http://dba.fyicenter.com/faq/oracle/Show-All-Tablespaces-in-Current-Database.html
How to generate range of numbers from 0 to n in ES2015 only?
You can use the spread operator on the keys of a freshly created array.
[...Array(n).keys()]
or
Array.from(Array(n).keys())
The Array.from() syntax is necessary if working with TypeScript
how to find 2d array size in c++
#include<iostream>
using namespace std ;
int main()
{
int A[3][4] = { {1,2,3,4} , {4,5,7,8} , {9,10,11,12} } ;
for(int rows=0 ; rows<sizeof(A)/sizeof(*A) ; rows++)
{
for(int columns=0 ; columns< sizeof(*A) / sizeof(*A[0]) ; columns++)
{
cout<<A[rows][columns] <<"\t" ;
}
cout<<endl ;
}
}
JavaScript/jQuery - "$ is not defined- $function()" error
Im using Asp.Net Core 2.2 with MVC and Razor cshtml My JQuery is referenced in a layout page I needed to add the following to my view.cshtml:
@section Scripts {
$script-here
}
CSS Input with width: 100% goes outside parent's bound
Do you want the input fields to be centered? A trick to center elements: specify the width of the element and set the margin to auto, eg:
margin : 0px auto;
width:300px
A link to your updated fiddle:
What's the best way to check if a file exists in C?
Usually when you want to check if a file exists, it's because you want to create that file if it doesn't. Graeme Perrow's answer is good if you don't want to create that file, but it's vulnerable to a race condition if you do: another process could create the file in between you checking if it exists, and you actually opening it to write to it. (Don't laugh... this could have bad security implications if the file created was a symlink!)
If you want to check for existence and create the file if it doesn't exist, atomically so that there are no race conditions, then use this:
#include <fcntl.h>
#include <errno.h>
fd = open(pathname, O_CREAT | O_WRONLY | O_EXCL, S_IRUSR | S_IWUSR);
if (fd < 0) {
/* failure */
if (errno == EEXIST) {
/* the file already existed */
...
}
} else {
/* now you can use the file */
}
python replace single backslash with double backslash
The backslash indicates a special escape character. Therefore, directory = path_to_directory.replace("\", "\\") would cause Python to think that the first argument to replace didn't end until the starting quotation of the second argument since it understood the ending quotation as an escape character.
directory=path_to_directory.replace("\\","\\\\")
When should I really use noexcept?
I think it is too early to give a "best practices" answer for this as there hasn't been enough time to use it in practice. If this was asked about throw specifiers right after they came out then the answers would be very different to now.
Having to think about whether or not I need to append
noexceptafter every function declaration would greatly reduce programmer productivity (and frankly, would be a pain).
Well, then use it when it's obvious that the function will never throw.
When can I realistically expect to observe a performance improvement after using
noexcept? [...] Personally, I care aboutnoexceptbecause of the increased freedom provided to the compiler to safely apply certain kinds of optimizations.
It seems like the biggest optimization gains are from user optimizations, not compiler ones due to the possibility of checking noexcept and overloading on it. Most compilers follow a no-penalty-if-you-don't-throw exception handling method, so I doubt it would change much (or anything) on the machine code level of your code, although perhaps reduce the binary size by removing the handling code.
Using noexcept in the big four (constructors, assignment, not destructors as they're already noexcept) will likely cause the best improvements as noexcept checks are 'common' in template code such as in std containers. For instance, std::vector won't use your class's move unless it's marked noexcept (or the compiler can deduce it otherwise).
websocket closing connection automatically
You need to send ping messages from time to time. I think the default timeout is 300 seconds. Sending websocket ping/pong frame from browser
Animate an element's width from 0 to 100%, with it and it's wrapper being only as wide as they need to be, without a pre-set width, in CSS3 or jQuery
Please check following snippet
/* DEBUG */_x000D_
.lwb-col {_x000D_
transition: box-shadow 0.5s ease;_x000D_
}_x000D_
.lwb-col:hover{_x000D_
box-shadow: 0 15px 30px -4px rgba(136, 155, 166, 0.4);_x000D_
_x000D_
}_x000D_
_x000D_
_x000D_
.lwb-col--link {_x000D_
font-weight: 500;_x000D_
position: relative;_x000D_
display: inline-block;_x000D_
}_x000D_
.lwb-col--link::after{_x000D_
border-bottom: 2px solid;_x000D_
bottom: -3px;_x000D_
content: "";_x000D_
display: block;_x000D_
left: 0;_x000D_
position: absolute;_x000D_
width: 100%;_x000D_
color: #E5E9EC;_x000D_
_x000D_
}_x000D_
.lwb-col--link::before{_x000D_
border-bottom: 2px solid;_x000D_
bottom: -3px;_x000D_
content: "";_x000D_
display: block;_x000D_
left: 0;_x000D_
position: absolute;_x000D_
width: 100%;_x000D_
color: #57B0FB;_x000D_
transform: scaleX(0);_x000D_
_x000D_
_x000D_
}_x000D_
.lwb-col:hover .lwb-col--link::before {_x000D_
border-color: #57B0FB;_x000D_
display: block;_x000D_
z-index: 2;_x000D_
transition: transform 0.3s;_x000D_
transform: scaleX(1);_x000D_
transform-origin: left center;_x000D_
}<div class="lwb-col">_x000D_
<h2>Webdesign</h2>_x000D_
<p>Steigern Sie Ihre Bekanntheit im Web mit individuellem & professionellem Webdesign. Organisierte Codestruktur, sowie perfekte SEO Optimierung und jahrelange Erfahrung sprechen für uns.</p>_x000D_
<span class="lwb-col--link">Mehr erfahren</span>_x000D_
</div>What is the difference between `git merge` and `git merge --no-ff`?
The --no-ff flag prevents git merge from executing a "fast-forward" if it detects that your current HEAD is an ancestor of the commit you're trying to merge. A fast-forward is when, instead of constructing a merge commit, git just moves your branch pointer to point at the incoming commit. This commonly occurs when doing a git pull without any local changes.
However, occasionally you want to prevent this behavior from happening, typically because you want to maintain a specific branch topology (e.g. you're merging in a topic branch and you want to ensure it looks that way when reading history). In order to do that, you can pass the --no-ff flag and git merge will always construct a merge instead of fast-forwarding.
Similarly, if you want to execute a git pull or use git merge in order to explicitly fast-forward, and you want to bail out if it can't fast-forward, then you can use the --ff-only flag. This way you can regularly do something like git pull --ff-only without thinking, and then if it errors out you can go back and decide if you want to merge or rebase.
Extract public/private key from PKCS12 file for later use in SSH-PK-Authentication
Solution 1:
Extract P12 from jks
keytool -importkeystore -srckeystore MyRootCA.jks -destkeystore MyRootCA.p12 -deststoretype PKCS12
Extract PEM from P12 and Edit file and pem from crt file
openssl pkcs12 -in MyRootCA.p12 -clcerts -nokeys -out MyRootCA.crt
Extract key from jks
openssl pkcs12 -in MyRootCA.p12 -nocerts -out encryptedPrivateKey.pem
openssl rsa -in encryptedPrivateKey.pem -out decryptedPrivateKey.key
Solution 2:
Extract PEM and encryptedPrivateKey to txt file```
openssl pkcs12 -in MyRootCA.p12 -out keys_out.txt
Decrypt privateKey
openssl rsa -in encryptedPrivateKey.key [-outform PEM] -out decryptedPrivateKey.key
How can I use String substring in Swift 4? 'substring(to:)' is deprecated: Please use String slicing subscript with a 'partial range from' operator
Some useful extensions:
extension String {
func substring(from: Int, to: Int) -> String {
let start = index(startIndex, offsetBy: from)
let end = index(start, offsetBy: to - from)
return String(self[start ..< end])
}
func substring(range: NSRange) -> String {
return substring(from: range.lowerBound, to: range.upperBound)
}
}
Android "Only the original thread that created a view hierarchy can touch its views."
If you are within a fragment, then you also need to get the activity object as runOnUIThread is a method on the activity.
An example in Kotlin with some surrounding context to make it clearer - this example is navigating from a camera fragment to a gallery fragment:
// Setup image capture listener which is triggered after photo has been taken
imageCapture.takePicture(
outputOptions, cameraExecutor, object : ImageCapture.OnImageSavedCallback {
override fun onError(exc: ImageCaptureException) {
Log.e(TAG, "Photo capture failed: ${exc.message}", exc)
}
override fun onImageSaved(output: ImageCapture.OutputFileResults) {
val savedUri = output.savedUri ?: Uri.fromFile(photoFile)
Log.d(TAG, "Photo capture succeeded: $savedUri")
//Do whatever work you do when image is saved
//Now ask navigator to move to new tab - as this
//updates UI do on the UI thread
activity?.runOnUiThread( {
Navigation.findNavController(
requireActivity(), R.id.fragment_container
).navigate(CameraFragmentDirections
.actionCameraToGallery(outputDirectory.absolutePath))
})
GUI Tool for PostgreSQL
Postgres Enterprise Manager from EnterpriseDB is probably the most advanced you'll find. It includes all the features of pgAdmin, plus monitoring of your hosts and database servers, predictive reporting, alerting and a SQL Profiler.
http://www.enterprisedb.com/products-services-training/products/postgres-enterprise-manager
Ninja edit disclaimer/notice: it seems that this user is affiliated with EnterpriseDB, as the linked Postgres Enterprise Manager website contains a video of one Dave Page.
In log4j, does checking isDebugEnabled before logging improve performance?
Like @erickson it depends. If I recall, isDebugEnabled is already build in the debug() method of Log4j.
As long as you're not doing some expensive computations in your debug statements, like loop on objects, perform computations and concatenate strings, you're fine in my opinion.
StringBuilder buffer = new StringBuilder();
for(Object o : myHugeCollection){
buffer.append(o.getName()).append(":");
buffer.append(o.getResultFromExpensiveComputation()).append(",");
}
log.debug(buffer.toString());
would be better as
if (log.isDebugEnabled(){
StringBuilder buffer = new StringBuilder();
for(Object o : myHugeCollection){
buffer.append(o.getName()).append(":");
buffer.append(o.getResultFromExpensiveComputation()).append(",");
}
log.debug(buffer.toString());
}
No resource found that matches the given name '@style/Theme.AppCompat.Light'
If you are looking for the solution in Android Studio :
- Right click on your app
- Open Module Settings
- Select Dependencies tab
- Click on green + symbol which is on the right side
- Select Library Dependency
- Choose appcompat-v7 from list
MySQL: Get column name or alias from query
Something similar to the proposed solutions, only the result is json with column_header : vaule for db_query ie sql.
cur = conn.cursor()
cur.execute(sql)
res = [dict((cur.description[i][0], value) for i, value in enumerate(row)) for row in cur.fetchall()]
output json example:
[
{
"FIRST_ROW":"Test 11",
"SECOND_ROW":"Test 12",
"THIRD_ROW":"Test 13"
},
{
"FIRST_ROW":"Test 21",
"SECOND_ROW":"Test 22",
"THIRD_ROW":"Test 23"
}
]
How can I get the current contents of an element in webdriver
I believe prestomanifesto was on the right track. It depends on what kind of element it is. You would need to use element.get_attribute('value') for input elements and element.text to return the text node of an element.
You could check the WebElement object with element.tag_name to find out what kind of element it is and return the appropriate value.
This should help you figure out:
driver = webdriver.Firefox()
driver.get('http://www.w3c.org')
element = driver.find_element_by_name('q')
element.send_keys('hi mom')
element_text = element.text
element_attribute_value = element.get_attribute('value')
print element
print 'element.text: {0}'.format(element_text)
print 'element.get_attribute(\'value\'): {0}'.format(element_attribute_value)
driver.quit()
How to add parameters to a HTTP GET request in Android?
I use a List of NameValuePair and URLEncodedUtils to create the url string I want.
protected String addLocationToUrl(String url){
if(!url.endsWith("?"))
url += "?";
List<NameValuePair> params = new LinkedList<NameValuePair>();
if (lat != 0.0 && lon != 0.0){
params.add(new BasicNameValuePair("lat", String.valueOf(lat)));
params.add(new BasicNameValuePair("lon", String.valueOf(lon)));
}
if (address != null && address.getPostalCode() != null)
params.add(new BasicNameValuePair("postalCode", address.getPostalCode()));
if (address != null && address.getCountryCode() != null)
params.add(new BasicNameValuePair("country",address.getCountryCode()));
params.add(new BasicNameValuePair("user", agent.uniqueId));
String paramString = URLEncodedUtils.format(params, "utf-8");
url += paramString;
return url;
}
How to sum columns in a dataTable?
There is also a way to do this without loops using the DataTable.Compute Method. The following example comes from that page. You can see that the code used is pretty simple.:
private void ComputeBySalesSalesID(DataSet dataSet)
{
// Presumes a DataTable named "Orders" that has a column named "Total."
DataTable table;
table = dataSet.Tables["Orders"];
// Declare an object variable.
object sumObject;
sumObject = table.Compute("Sum(Total)", "EmpID = 5");
}
I must add that if you do not need to filter the results, you can always pass an empty string:
sumObject = table.Compute("Sum(Total)", "")
PowerShell equivalent to grep -f
This question already has an answer, but I just want to add that in Windows there is Windows Subsystem for Linux WSL.
So for example if you want to check if you have service named Elasicsearch that is in status running you can do something like the snippet below in powershell
net start | grep Elasticsearch
Java escape JSON String?
public static String ecapse(String jsString) {
jsString = jsString.replace("\\", "\\\\");
jsString = jsString.replace("\"", "\\\"");
jsString = jsString.replace("\b", "\\b");
jsString = jsString.replace("\f", "\\f");
jsString = jsString.replace("\n", "\\n");
jsString = jsString.replace("\r", "\\r");
jsString = jsString.replace("\t", "\\t");
jsString = jsString.replace("/", "\\/");
return jsString;
}
How to kill a child process by the parent process?
In the parent process, fork()'s return value is the process ID of the child process. Stuff that value away somewhere for when you need to terminate the child process. fork() returns zero(0) in the child process.
When you need to terminate the child process, use the kill(2) function with the process ID returned by fork(), and the signal you wish to deliver (e.g. SIGTERM).
Remember to call wait() on the child process to prevent any lingering zombies.
How to test REST API using Chrome's extension "Advanced Rest Client"
From the screenshot I can see that you want to pass "user" and "password" values to the service. You have send the parameter values in the request header part which is wrong.
The values are sent in the request body and not in the request header.
Also your syntax is wrong.
Correct syntax is: {"user":"user_val","password":"password_val"}.
Also check what is the the content type. It should match with the content type you have set to your service.
How to get row count in sqlite using Android?
Using DatabaseUtils.queryNumEntries():
public long getProfilesCount() {
SQLiteDatabase db = this.getReadableDatabase();
long count = DatabaseUtils.queryNumEntries(db, TABLE_NAME);
db.close();
return count;
}
or (more inefficiently)
public int getProfilesCount() {
String countQuery = "SELECT * FROM " + TABLE_NAME;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
int count = cursor.getCount();
cursor.close();
return count;
}
In Activity:
int profile_counts = db.getProfilesCount();
db.close();
WPF: ItemsControl with scrollbar (ScrollViewer)
You have to modify the control template instead of ItemsPanelTemplate:
<ItemsControl >
<ItemsControl.Template>
<ControlTemplate>
<ScrollViewer x:Name="ScrollViewer" Padding="{TemplateBinding Padding}">
<ItemsPresenter />
</ScrollViewer>
</ControlTemplate>
</ItemsControl.Template>
</ItemsControl>
Maybe, your code does not working because StackPanel has own scrolling functionality. Try to use StackPanel.CanVerticallyScroll property.
Difference between array_push() and $array[] =
The difference is in the line below to "because in that way there is no overhead of calling a function."
array_push()will raise a warning if the first argument is not an array. This differs from the$var[]behaviour where a new array is created.
Count the Number of Tables in a SQL Server Database
Try this:
SELECT Count(*)
FROM <DATABASE_NAME>.INFORMATION_SCHEMA.TABLES
WHERE TABLE_TYPE = 'BASE TABLE'
div inside table
You can't put a div directly inside a table, like this:
<!-- INVALID -->
<table>
<div>
Hello World
</div>
</table>
Putting a div inside a td or th element is fine, however:
<!-- VALID -->
<table>
<tr>
<td>
<div>
Hello World
</div>
</td>
</tr>
</table>
Dump a NumPy array into a csv file
As already discussed, the best way to dump the array into a CSV file is by using .savetxt(...)method. However, there are certain things we should know to do it properly.
For example, if you have a numpy array with dtype = np.int32 as
narr = np.array([[1,2],
[3,4],
[5,6]], dtype=np.int32)
and want to save using savetxt as
np.savetxt('values.csv', narr, delimiter=",")
It will store the data in floating point exponential format as
1.000000000000000000e+00,2.000000000000000000e+00
3.000000000000000000e+00,4.000000000000000000e+00
5.000000000000000000e+00,6.000000000000000000e+00
You will have to change the formatting by using a parameter called fmt as
np.savetxt('values.csv', narr, fmt="%d", delimiter=",")
to store data in its original format
Saving Data in Compressed gz format
Also, savetxt can be used for storing data in .gz compressed format which might be useful while transferring data over network.
We just need to change the extension of the file as .gz and numpy will take care of everything automatically
np.savetxt('values.gz', narr, fmt="%d", delimiter=",")
Hope it helps
Run multiple python scripts concurrently
You can use Gnu-Parallel to run commands concurrently, works on Windows, Linux/Unix.
parallel ::: "python script1.py" "python script2.py"
Javascript "Uncaught TypeError: object is not a function" associativity question
I was getting this same error and spent a day and a half trying to find a solution. Naomi's answer lead me to the solution I needed.
My input (type=button) had an attribute name that was identical to a function name that was being called by the onClick event. Once I changed the attribute name everything worked.
<input type="button" name="clearEmployer" onClick="clearEmployer();">
changed to:
<input type="button" name="clearEmployerBtn" onClick="clearEmployer();">
Error "library not found for" after putting application in AdMob
Running 'pod update' in my project fixed my problem with the 'library not found for -lSTPopup' error.
Remarking Trevor Panhorst's answer:
"Just be careful doing pod update if you don't use explicit versions in your pod file."
'do...while' vs. 'while'
I've used a do while when I'm reading a sentinel value at the beginning of a file, but other than that, I don't think it's abnormal that this structure isn't too commonly used--do-whiles are really situational.
-- file --
5
Joe
Bob
Jake
Sarah
Sue
-- code --
int MAX;
int count = 0;
do {
MAX = a.readLine();
k[count] = a.readLine();
count++;
} while(count <= MAX)
X close button only using css
As a pure CSS solution for the close or 'times' symbol you can use the ISO code with the content property. I often use this for :after or :before pseudo selectors.
The content code is \00d7.
Example
div:after{
display: inline-block;
content: "\00d7"; /* This will render the 'X' */
}
You can then style and position the pseudo selector in any way you want. Hope this helps someone :).
one line if statement in php
You can use Ternary operator logic Ternary operator logic is the process of using "(condition)? (true return value) : (false return value)" statements to shorten your if/else structures. i.e
/* most basic usage */
$var = 5;
$var_is_greater_than_two = ($var > 2 ? true : false); // returns true
List supported SSL/TLS versions for a specific OpenSSL build
It's clumsy, but you can get this from the usage messages for s_client or s_server, which are #ifed at compile time to match the supported protocol versions. Use something like
openssl s_client -help 2>&1 | awk '/-ssl[0-9]|-tls[0-9]/{print $1}'
# in older releases any unknown -option will work; in 1.1.0 must be exactly -help
Nesting await in Parallel.ForEach
I am a little late to party but you may want to consider using GetAwaiter.GetResult() to run your async code in sync context but as paralled as below;
Parallel.ForEach(ids, i =>
{
ICustomerRepo repo = new CustomerRepo();
// Run this in thread which Parallel library occupied.
var cust = repo.GetCustomer(i).GetAwaiter().GetResult();
customers.Add(cust);
});
posting hidden value
You have to use $_POST['date'] instead of $date if it's coming from a POST request ($_GET if it's a GET request).
How the single threaded non blocking IO model works in Node.js
Node.js uses libuv behind the scenes. libuv has a thread pool (of size 4 by default). Therefore Node.js does use threads to achieve concurrency.
However, your code runs on a single thread (i.e., all of the callbacks of Node.js functions will be called on the same thread, the so called loop-thread or event-loop). When people say "Node.js runs on a single thread" they are really saying "the callbacks of Node.js run on a single thread".
how do you view macro code in access?
EDIT: Per Michael Dillon's answer, SaveAsText does save the commands in a macro without having to go through converting to VBA. I don't know what happened when I tested that, but it didn't produce useful text in the resulting file.
So, I learned something new today!
ORIGINAL POST: To expand the question, I wondered if there was a way to retrieve the contents of a macro from code, and it doesn't appear that there is (at least not in A2003, which is what I'm running).
There are two collections through which you can access stored Macros:
CurrentDB.Containers("Scripts").Documents
CurrentProject.AllMacros
The properties that Intellisense identifies for the two collections are rather different, because the collections are of different types. The first (i.e., traditional, pre-A2000 way) is via a documents collection, and the methods/properties/members of all documents are the same, i.e., not specific to Macros.
Likewise, the All... collections of CurrentProject return collections where the individual items are of type Access Object. The result is that Intellisense gives you methods/properties/members that may not exist for the particular document/object.
So far as I can tell, there is no way to programatically retrieve the contents of a macro.
This would stand to reason, as macros aren't of much use to anyone who would have the capability of writing code to examine them programatically.
But if you just want to evaluate what the macros do, one alternative would be to convert them to VBA, which can be done programmatically thus:
Dim varItem As Variant
Dim strMacroName As String
For Each varItem In CurrentProject.AllMacros
strMacroName = varItem.Name
'Debug.Print strMacroName
DoCmd.SelectObject acMacro, strMacroName, True
DoCmd.RunCommand acCmdConvertMacrosToVisualBasic
Application.SaveAsText acModule, "Converted Macro- " & strMacroName, _
CurrentProject.Path & "\" & "Converted Macro- " & strMacroName & ".txt"
Next varItem
Then you could use the resulting text files for whatever you needed to do.
Note that this has to be run interactively in Access because it uses DoCmd.RunCommand, and you have to click OK for each macro -- tedious for databases with lots of macros, but not too onerous for a normal app, which shouldn't have more than a handful of macros.
CSS opacity only to background color, not the text on it?
Use:
background:url("location of image"); // Use an image with opacity
This method will work in all browsers.
Which language uses .pde extension?
Bad news I'm afraid (or maybe great news?) : it isn't C code, it's an example of "Processing" - an open source language aimed at programming images. Take a look here
Looks very cool.
Load CSV data into MySQL in Python
I think you have to do mydb.commit() all the insert into.
Something like this
import csv
import MySQLdb
mydb = MySQLdb.connect(host='localhost',
user='root',
passwd='',
db='mydb')
cursor = mydb.cursor()
csv_data = csv.reader(file('students.csv'))
for row in csv_data:
cursor.execute('INSERT INTO testcsv(names, \
classes, mark )' \
'VALUES("%s", "%s", "%s")',
row)
#close the connection to the database.
mydb.commit()
cursor.close()
print "Done"
How can I remove an element from a list?
You can also negatively index from a list using the extract function of the magrittr package to remove a list item.
a <- seq(1,5)
b <- seq(2,6)
c <- seq(3,7)
l <- list(a,b,c)
library(magrittr)
extract(l,-1) #simple one-function method
[[1]]
[1] 2 3 4 5 6
[[2]]
[1] 3 4 5 6 7
Removing All Items From A ComboBox?
Private Sub cmdClear_Click()
ComboBox1.Value = Null
ComboBox2.Value = Null
End Sub
How to access a property of an object (stdClass Object) member/element of an array?
To access an array member you use $array['KEY'];
To access an object member you use $obj->KEY;
To access an object member inside an array of objects:
$array[0] // Get the first object in the array
$array[0]->KEY // then access its key
You may also loop over an array of objects like so:
foreach ($arrayOfObjs as $key => $object) {
echo $object->object_property;
}
Think of an array as a collection of things. It's a bag where you can store your stuff and give them a unique id (key) and access them (or take the stuff out of the bag) using that key. I want to keep things simple here, but this bag can contain other bags too :)
Update (this might help someone understand better):
An array contains 'key' and 'value' pairs. Providing a key for an array member is optional and in this case it is automatically assigned a numeric key which starts with 0 and keeps on incrementing by 1 for each additional member. We can retrieve a 'value' from the array by it's 'key'.
So we can define an array in the following ways (with respect to keys):
First method:
$colorPallete = ['red', 'blue', 'green'];
The above array will be assigned numeric keys automatically. So the key assigned to red will be 0, for blue 1 and so on.
Getting values from the above array:
$colorPallete[0]; // will output 'red'
$colorPallete[1]; // will output 'blue'
$colorPallete[2]; // will output 'green'
Second method:
$colorPallete = ['love' => 'red', 'trust' => 'blue', 'envy' => 'green']; // we expliicitely define the keys ourself.
Getting values from the above array:
$colorPallete['love']; // will output 'red'
$colorPallete['trust']; // will output 'blue'
$colorPallete['envy']; // will output 'green'
How do I add a auto_increment primary key in SQL Server database?
It can be done in a single command. You need to set the IDENTITY property for "auto number":
ALTER TABLE MyTable ADD mytableID int NOT NULL IDENTITY (1,1) PRIMARY KEY
More precisely, to set a named table level constraint:
ALTER TABLE MyTable
ADD MytableID int NOT NULL IDENTITY (1,1),
CONSTRAINT PK_MyTable PRIMARY KEY CLUSTERED (MyTableID)
See ALTER TABLE and IDENTITY on MSDN
How to get to a particular element in a List in java?
String[] is an array of Strings. Such an array is internally a class. Like all classes that don't explicitly extend some other class, it extends Object implicitly. The method toString() of class Object, by default, gives you the representation you see: the class name, followed by @, followed by the hash code in hex. Since the String[] class doesn't override the toString() method, you get that as a result.
Create some method that outputs the array elements for you. Iterate over the array and use System.out.print() (not print*ln*) on the elements.
Getting error: ISO C++ forbids declaration of with no type
Your declaration is int ttTreeInsert(int value);
However, your definition/implementation is
ttTree::ttTreeInsert(int value)
{
}
Notice that the return type int is missing in the implementation. Instead it should be
int ttTree::ttTreeInsert(int value)
{
return 1; // or some valid int
}
Using if-else in JSP
You may try this example:
<form>_x000D_
<h1>Hello! I'm duke! What's you name?</h1>_x000D_
<input type="text" name="user">_x000D_
<br>_x000D_
<br>_x000D_
<input type="submit" value="submit"> _x000D_
<input type="reset">_x000D_
</form>_x000D_
<h1>Hello ${param.user}</h1> _x000D_
<!-- its Expression Language -->Where can I find free WPF controls and control templates?
I strongly recommend the MahApps it's simply awesome!
How to make a loop in x86 assembly language?
Yet another method is using the LOOP instruction:
mov cx, 3
myloop:
; Your loop content
loop myloop
The loop instruction automatically decrements cx, and only jumps if cx != 0. There are also LOOPE, and LOOPNE variants, if you want to do some additional check for your loop to break out early.
If you want to modify cx during your loop, make sure to push it onto the stack before the loop content, and pop it off after:
mov cx, 3
myloop:
push cx
; Your loop content
pop cx
loop myloop
MYSQL Sum Query with IF Condition
Try with a CASE in this way :
SUM(CASE
WHEN PaymentType = "credit card"
THEN TotalAmount
ELSE 0
END) AS CreditCardTotal,
Should give what you are looking for ...
JavaScript Extending Class
If you don't like the prototype approach, because it doesn't really behave in a nice OOP-way, you could try this:
var BaseClass = function()
{
this.some_var = "foobar";
/**
* @return string
*/
this.someMethod = function() {
return this.some_var;
}
};
var MyClass = new Class({ extends: BaseClass }, function()
{
/**
* @param string value
*/
this.__construct = function(value)
{
this.some_var = value;
}
})
Using lightweight library (2k minified): https://github.com/haroldiedema/joii
ImportError: No module named 'pygame'
go to python/scripts folder, open a command window to this path, type the following:
C:\python34\scripts> python -m pip install pygame
To test it, open python IDE and type
import pygame
print (pygame.ver)
It worked for me...
Typescript import/as vs import/require?
These are mostly equivalent, but import * has some restrictions that import ... = require doesn't.
import * as creates an identifier that is a module object, emphasis on object. According to the ES6 spec, this object is never callable or newable - it only has properties. If you're trying to import a function or class, you should use
import express = require('express');
or (depending on your module loader)
import express from 'express';
Attempting to use import * as express and then invoking express() is always illegal according to the ES6 spec. In some runtime+transpilation environments this might happen to work anyway, but it might break at any point in the future without warning, which will make you sad.
How to find the length of an array list?
System.out.println(myList.size());
Since no elements are in the list
output => 0
myList.add("newString"); // use myList.add() to insert elements to the arraylist
System.out.println(myList.size());
Since one element is added to the list
output => 1
Excel VBA - Range.Copy transpose paste
Here's an efficient option that doesn't use the clipboard.
Sub transposeAndPasteRow(rowToCopy As Range, pasteTarget As Range)
pasteTarget.Resize(rowToCopy.Columns.Count) = Application.WorksheetFunction.Transpose(rowToCopy.Value)
End Sub
Use it like this.
Sub test()
Call transposeAndPasteRow(Worksheets("Sheet1").Range("A1:A5"), Worksheets("Sheet2").Range("A1"))
End Sub
How do I compile with -Xlint:unchecked?
A cleaner way to specify the Gradle compiler arguments follow:
compileJava.options.compilerArgs = ['-Xlint:unchecked','-Xlint:deprecation']
Alternative to Intersect in MySQL
I just checked it in MySQL 5.7 and am really surprised how no one offered a simple answer: NATURAL JOIN
When the tables or (select outcome) have IDENTICAL columns, you can use NATURAL JOIN as a way to find intersection:
For example:
table1:
id, name, jobid
'1', 'John', '1'
'2', 'Jack', '3'
'3', 'Adam', '2'
'4', 'Bill', '6'
table2:
id, name, jobid
'1', 'John', '1'
'2', 'Jack', '3'
'3', 'Adam', '2'
'4', 'Bill', '5'
'5', 'Max', '6'
And here is the query:
SELECT * FROM table1 NATURAL JOIN table2;
Query Result: id, name, jobid
'1', 'John', '1'
'2', 'Jack', '3'
'3', 'Adam', '2'
Vim clear last search highlighting
There are two 'must have' plugins for this:
MIPS: Integer Multiplication and Division
To multiply, use mult for signed multiplication and multu for unsigned multiplication. Note that the result of the multiplication of two 32-bit numbers yields a 64-number. If you want the result back in $v0 that means that you assume the result will fit in 32 bits.
The 32 most significant bits will be held in the HI special register (accessible by mfhi instruction) and the 32 least significant bits will be held in the LO special register (accessible by the mflo instruction):
E.g.:
li $a0, 5
li $a1, 3
mult $a0, $a1
mfhi $a2 # 32 most significant bits of multiplication to $a2
mflo $v0 # 32 least significant bits of multiplication to $v0
To divide, use div for signed division and divu for unsigned division. In this case, the HI special register will hold the remainder and the LO special register will hold the quotient of the division.
E.g.:
div $a0, $a1
mfhi $a2 # remainder to $a2
mflo $v0 # quotient to $v0
How to check iOS version?
if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_6_1) {
// Your code here
}
Where of course, NSFoundationVersionNumber_iOS_6_1 must be changed to by applicable for the iOS version you want to check. What I have now written will probably be used a lot when testing if a device is running iOS7 or a previous version.
Populating spinner directly in the layout xml
In regards to the first comment: If you do this you will get an error(in Android Studio). This is in regards to it being out of the Android namespace. If you don't know how to fix this error, check the example out below. Hope this helps!
Example -Before :
<string-array name="roomSize">
<item>Small(0-4)</item>
<item>Medium(4-8)</item>
<item>Large(9+)</item>
</string-array>
Example - After:
<string-array android:name="roomSize">
<item>Small(0-4)</item>
<item>Medium(4-8)</item>
<item>Large(9+)</item>
</string-array>
Write a formula in an Excel Cell using VBA
You can try using FormulaLocal property instead of Formula. Then the semicolon should work.
Java: Get last element after split
In java 8
String lastItem = Stream.of(str.split("-")).reduce((first,last)->last).get();
Resolve absolute path from relative path and/or file name
Without having to have another batch file to pass arguments to (and use the argument operators), you can use FOR /F:
FOR /F %%i IN ("..\relativePath") DO echo absolute path: %%~fi
where the i in %%~fi is the variable defined at /F %%i. eg. if you changed that to /F %%a then the last part would be %%~fa.
To do the same thing right at the command prompt (and not in a batch file) replace %% with %...
Converting a string to JSON object
var Data=[{"id": "name2", "label": "Quantity"}]
Pass the string variable into Json parse :
Objdata= Json.parse(Data);
Disable F5 and browser refresh using JavaScript
$(window).bind('beforeunload', function(e) {
return "Unloading this page may lose data. What do you want to do..."
e.preventDefault();
});
Laravel 5 - artisan seed [ReflectionException] Class SongsTableSeeder does not exist
i got [ReflectionException] Class Seeder does not exist too and when i use composer dump-autoload, i got an error preg_match(): JIT compilation failed: no more memory when i run it.
What i did is that i change ;pcre.jit=1 to pcre.jit=Off in php.ini!
You can find the path by using php --ini in your terminal!
I am using mac with php 7.3! Hope that help any of you guys out there!
Java keytool easy way to add server cert from url/port
I use openssl, but if you prefer not to, or are on a system (particularly Windows) that doesn't have it, since java 7 in 2011 keytool can do the whole job:
keytool -printcert -sslserver host[:port] -rfc >tempfile
keytool -import [-noprompt] -alias nm -keystore file [-storepass pw] [-storetype ty] <tempfile
# or with noprompt and storepass (so nothing on stdin besides the cert) piping works:
keytool -printcert -sslserver host[:port] -rfc | keytool -import -noprompt -alias nm -keystore file -storepass pw [-storetype ty]
Conversely, for java 9 up always, and for earlier versions in many cases, Java can use a PKCS12 file for a keystore instead of the traditional JKS file, and OpenSSL can create a PKCS12 without any assistance from keytool:
openssl s_client -connect host:port </dev/null | openssl pkcs12 -export -nokeys [-name nm] [-passout option] -out p12file
# <NUL on Windows
# default is to prompt for password, but -passout supports several options
# including actual value, envvar, or file; see the openssl(1ssl) man page
URL rewriting with PHP
PHP is not what you are looking for, check out mod_rewrite
Deleting array elements in JavaScript - delete vs splice
delete will delete the object property, but will not reindex the array or update its length. This makes it appears as if it is undefined:
> myArray = ['a', 'b', 'c', 'd']
["a", "b", "c", "d"]
> delete myArray[0]
true
> myArray[0]
undefined
Note that it is not in fact set to the value undefined, rather the property is removed from the array, making it appear undefined. The Chrome dev tools make this distinction clear by printing empty when logging the array.
> myArray[0]
undefined
> myArray
[empty, "b", "c", "d"]
myArray.splice(start, deleteCount) actually removes the element, reindexes the array, and changes its length.
> myArray = ['a', 'b', 'c', 'd']
["a", "b", "c", "d"]
> myArray.splice(0, 2)
["a", "b"]
> myArray
["c", "d"]
If else in stored procedure sql server
You do not have to have the RETURN stament.
Have anther look at Using a Stored Procedure with Output Parameters
Also have another look at the OUT section in CREATE PROCEDURE
Get a list of dates between two dates using a function
-- ### Six of one half dozen of another. Another method assuming MsSql
Declare @MonthStart datetime = convert(DateTime,'07/01/2016')
Declare @MonthEnd datetime = convert(DateTime,'07/31/2016')
Declare @DayCount_int Int = 0
Declare @WhileCount_int Int = 0
set @DayCount_int = DATEDIFF(DAY, @MonthStart, @MonthEnd)
select @WhileCount_int
WHILE @WhileCount_int < @DayCount_int + 1
BEGIN
print convert(Varchar(24),DateAdd(day,@WhileCount_int,@MonthStart),101)
SET @WhileCount_int = @WhileCount_int + 1;
END;
One command to create a directory and file inside it linux command
Just a simple command below is enough.
mkdir a && touch !$/file.txt
Thx
if condition in sql server update query
DECLARE @JCnt int=null
SEt @JCnt=(SELECT COUNT( ISNUll(EmpCode,0)) FROM tbl_Employees WHERE EmpCode=1 )
UPDATE #TempCode
SET janCA= CASE WHEN @JCnt>0 THEN (SELECT SUM (ISNUll(Amount,0)) FROM tbl_Salary WHERE Code=1 )ELSE 0 END
WHERE code=1
python-dev installation error: ImportError: No module named apt_pkg
A last resort is sudo cp /usr/lib/python3/dist-packages/apt_pkg.cpython-35m-x86_64-linux-gnu.so /usr/lib/python3/dist-packages/apt_pkg.cpython-36m-x86_64-linux-gnu.so
if the ln command is too much for you or somehow magically doesn't work.
cp above can also be mv if you are only dedicated to using one Python version.
Jquery - Uncaught TypeError: Cannot use 'in' operator to search for '324' in
You have a JSON string, not an object. Tell jQuery that you expect a JSON response and it will parse it for you. Either use $.getJSON instead of $.get, or pass the dataType argument to $.get:
$.get(
'index.php?r=admin/post/ajax',
{"parentCatId":parentCatId},
function(data){
$.each(data, function(key, value){
console.log(key + ":" + value)
})
},
'json'
);
What does "Table does not support optimize, doing recreate + analyze instead" mean?
That's really an informational message.
Likely, you're doing OPTIMIZE on an InnoDB table (table using the InnoDB storage engine, rather than the MyISAM storage engine).
InnoDB doesn't support the OPTIMIZE the way MyISAM does. It does something different. It creates an empty table, and copies all of the rows from the existing table into it, and essentially deletes the old table and renames the new table, and then runs an ANALYZE to gather statistics. That's the closest that InnoDB can get to doing an OPTIMIZE.
The message you are getting is basically MySQL server repeating what the InnoDB storage engine told MySQL server:
Table does not support optimize is the InnoDB storage engine saying...
"I (the InnoDB storage engine) don't do an OPTIMIZE operation like my friend (the MyISAM storage engine) does."
"doing recreate + analyze instead" is the InnoDB storage engine saying...
"I have decided to perform a different set of operations which will achieve an equivalent result."
Passing data through intent using Serializable
In kotlin: Object class implements Serializable:
class MyClass: Serializable {
//members
}
At the point where the object sending:
val fragment = UserDetailFragment()
val bundle = Bundle()
bundle.putSerializable("key", myObject)
fragment.arguments = bundle
At the fragment, where we want to get our object:
val bundle: Bundle? = arguments
bundle?.let {
val myObject = it.getSerializable("key") as MyClass
myObject.memberName?.let { it1 -> showShortToast(it1) }
}
Copy and Paste a set range in the next empty row
Be careful with the "Range(...)" without first qualifying a Worksheet because it will use the currently Active worksheet to make the copy from. It's best to fully qualify both sheets. Please give this a shot (please change "Sheet1" with the copy worksheet):
EDIT: edited for pasting values only based on comments below.
Private Sub CommandButton1_Click()
Application.ScreenUpdating = False
Dim copySheet As Worksheet
Dim pasteSheet As Worksheet
Set copySheet = Worksheets("Sheet1")
Set pasteSheet = Worksheets("Sheet2")
copySheet.Range("A3:E3").Copy
pasteSheet.Cells(Rows.Count, 1).End(xlUp).Offset(1, 0).PasteSpecial xlPasteValues
Application.CutCopyMode = False
Application.ScreenUpdating = True
End Sub
How to make script execution wait until jquery is loaded
A tangential note on the approaches here that load use setTimeout or setInterval. In those cases it's possible that when your check runs again, the DOM will already have loaded, and the browser's DOMContentLoaded event will have been fired, so you can't detect that event reliably using these approaches. What I found is that jQuery's ready still works, though, so you can embed your usual
jQuery(document).ready(function ($) { ... }
inside your setTimeout or setInterval and everything should work as normal.
Can two or more people edit an Excel document at the same time?
No, sadly:
The Excel 2010 client application does not support co-authoring workbooks in SharePoint Server 2010. However, the Excel client application does support non-real-time co-authoring workbooks stored locally or on network (UNC) paths by using the Shared Workbook feature. Co-authoring workbooks in SharePoint is supported by using the Microsoft Excel Web App, included with Office Web Apps
From Co-authoring overview (SharePoint Server 2010)
...and not for SharePoint 2013 either. Though it works for pretty much all other Office documents. Go figure.
How to view changes made to files on a certain revision in Subversion
Call this in the project:
svn diff -r REVNO:HEAD --summarize
REVNO is the start revision number and HEAD is the end revision number. If HEAD is equal to the last revision number, it can skip it.
The command returns a list with all files that are changed/added/deleted in this revision period.
The command can be called with the URL revision parameter to check changes like this:
svn diff -r REVNO:HEAD --summarize SVN_URL
HTML5 Canvas background image
Why don't you style it out:
<canvas id="canvas" width="800" height="600" style="background: url('./images/image.jpg')">
Your browser does not support the canvas element.
</canvas>
node.js - how to write an array to file
If it's a huuge array and it would take too much memory to serialize it to a string before writing, you can use streams:
var fs = require('fs');
var file = fs.createWriteStream('array.txt');
file.on('error', function(err) { /* error handling */ });
arr.forEach(function(v) { file.write(v.join(', ') + '\n'); });
file.end();
Scroll Automatically to the Bottom of the Page
A simple way if you want to scroll down specific element
Call this function whenever you want to scroll down.
function scrollDown() {_x000D_
document.getElementById('scroll').scrollTop = document.getElementById('scroll').scrollHeight_x000D_
}ul{_x000D_
height: 100px;_x000D_
width: 200px;_x000D_
overflow-y: scroll;_x000D_
border: 1px solid #000;_x000D_
}<ul id='scroll'>_x000D_
<li>Top Here</li>_x000D_
<li>Something Here</li>_x000D_
<li>Something Here</li>_x000D_
<li>Something Here</li>_x000D_
<li>Something Here</li>_x000D_
<li>Something Here</li>_x000D_
<li>Something Here</li>_x000D_
<li>Something Here</li>_x000D_
<li>Something Here</li>_x000D_
<li>Something Here</li>_x000D_
<li>Bottom Here</li>_x000D_
<li style="color: red">Bottom Here</li>_x000D_
</ul>_x000D_
_x000D_
<br />_x000D_
_x000D_
<button onclick='scrollDown()'>Scroll Down</button>How do I revert back to an OpenWrt router configuration?
You can run this command for making a factory reset:
killall dropbear uhttpd; sleep 1; mtd -r erase rootfs_data
How to increase Maximum Upload size in cPanel?
Login to your WHM panel if you have access to
Then go to Software -> MultiPHP INI Editor
Then select the php version from the dropdown, then scroll down for the upload_max_filesize which will be 2M by default, now increase it according to your need.
Also enable the file_uploads for HTTP file uploads for convenience.
If you don't have access to WHM, then follow the .htaccess method.
Split code over multiple lines in an R script
Dirk's method above will absolutely work, but if you're looking for a way to bring in a long string where whitespace/structure is important to preserve (example: a SQL query using RODBC) there is a two step solution.
1) Bring the text string in across multiple lines
long_string <- "this
is
a
long
string
with
whitespace"
2) R will introduce a bunch of \n characters. Strip those out with strwrap(), which destroys whitespace, per the documentation:
strwrap(long_string, width=10000, simplify=TRUE)
By telling strwrap to wrap your text to a very, very long row, you get a single character vector with no whitespace/newline characters.
How to call multiple functions with @click in vue?
I'd add, that you can also use this to call multiple emits or methods or both together by separating with ; semicolon
@click="method1(); $emit('emit1'); $emit('emit2');"
Create GUI using Eclipse (Java)
Yes. Use WindowBuilder Pro (provided by Google). It supports SWT and Swing as well with multiple layouts (Group layout, MiGLayout etc.) It's integrated out of the box with Eclipse Indigo, but you can install plugin on previous versions (3.4/3.5/3.6):
Is there a GUI design app for the Tkinter / grid geometry?
Apart from the options already given in other answers, there's a current more active, recent and open-source project called pygubu.
This is the first description by the author taken from the github repository:
Pygubu is a RAD tool to enable quick & easy development of user interfaces for the python tkinter module.
The user interfaces designed are saved as XML, and by using the pygubu builder these can be loaded by applications dynamically as needed. Pygubu is inspired by Glade.
Pygubu hello world program is an introductory video explaining how to create a first project using Pygubu.
The following in an image of interface of the last version of pygubu designer on a OS X Yosemite 10.10.2:
I would definitely give it a try, and contribute to its development.
How to do this using jQuery - document.getElementById("selectlist").value
Chaos is spot on, though for these sorts of questions you should check out the Jquery Documentation online - it really is quite comprehensive. The feature you are after is called 'jquery selectors'
Generally you do $('#ID').val() - the .afterwards can do a number of things on the element that is returned from the selector. You can also select all of the elements on a certain class and do something to each of them. Check out the documentation for some good examples.
Simple GUI Java calculator
assuming that string1 is your whole operation
use mdas
double result;
string recurAndCheck(string operation){
if(operation.indexOf("/")){
String leftSide = recurAndCheck(operation.split("/")[0]);
string rightSide = recurAndCheck(operation.split("/")[1]);
result = Double.parseDouble(leftSide)/Double.parseDouble(rightSide);
} else if (..continue w/ *...) {
//same as above but change / with *
} else if (..continue w/ -) {
//change as above but change with -
} else if (..continuew with +) {
//change with add
} else {
return;
}
}
How to search for file names in Visual Studio?
Visual Assist: link.
Install, load solution, press Shift+Alt+O, search for files in solution by substring. Try also Shift+Alt+S, for the equivalent for symbols. This addin has a bunch of completion popup and syntax colouring stuff in it that aren't to all tastes, but the code browsing features are done well and seem uncontroversial.
Judging by comments on the forums, compatibility with Resharper is something they pay attention to.
For free, try also Nifty Solution: link.
I haven't used this myself, but I use the author's Nifty Perforce plugin, and that is pretty tidy.
ISO C90 forbids mixed declarations and code in C
Up until the C99 standard, all declarations had to come before any statements in a block:
void foo()
{
int i, j;
double k;
char *c;
// code
if (c)
{
int m, n;
// more code
}
// etc.
}
C99 allowed for mixing declarations and statements (like C++). Many compilers still default to C89, and some compilers (such as Microsoft's) don't support C99 at all.
So, you will need to do the following:
Determine if your compiler supports C99 or later; if it does, configure it so that it's compiling C99 instead of C89;
If your compiler doesn't support C99 or later, you will either need to find a different compiler that does support it, or rewrite your code so that all declarations come before any statements within the block.
AttributeError: 'datetime' module has no attribute 'strptime'
I got the same problem and it is not the solution that you told. So I changed the "from datetime import datetime" to "import datetime". After that with the help of "datetime.datetime" I can get the whole modules correctly. I guess this is the correct answer to that question.
Set margins in a LinearLayout programmatically
Try this:
MarginLayoutParams params = (MarginLayoutParams) view.getLayoutParams();
params.width = 250;
params.leftMargin = 50;
params.topMargin = 50;
Allowing the "Enter" key to press the submit button, as opposed to only using MouseClick
I know this isn't the best way to do it, but right click the button in question, events, key, key typed. This is a simple way to do it, but reacts to any key
Is recursion ever faster than looping?
Most of the answers here are wrong. The right answer is it depends. For example, here are two C functions which walks through a tree. First the recursive one:
static
void mm_scan_black(mm_rc *m, ptr p) {
SET_COL(p, COL_BLACK);
P_FOR_EACH_CHILD(p, {
INC_RC(p_child);
if (GET_COL(p_child) != COL_BLACK) {
mm_scan_black(m, p_child);
}
});
}
And here is the same function implemented using iteration:
static
void mm_scan_black(mm_rc *m, ptr p) {
stack *st = m->black_stack;
SET_COL(p, COL_BLACK);
st_push(st, p);
while (st->used != 0) {
p = st_pop(st);
P_FOR_EACH_CHILD(p, {
INC_RC(p_child);
if (GET_COL(p_child) != COL_BLACK) {
SET_COL(p_child, COL_BLACK);
st_push(st, p_child);
}
});
}
}
It's not important to understand the details of the code. Just that p are nodes and that P_FOR_EACH_CHILD does the walking. In the iterative version we need an explicit stack st onto which nodes are pushed and then popped and manipulated.
The recursive function runs much faster than the iterative one. The reason is because in the latter, for each item, a CALL to the function st_push is needed and then another to st_pop.
In the former, you only have the recursive CALL for each node.
Plus, accessing variables on the callstack is incredibly fast. It means you are reading from memory which is likely to always be in the innermost cache. An explicit stack, on the other hand, has to be backed by malloc:ed memory from the heap which is much slower to access.
With careful optimization, such as inlining st_push and st_pop, I can reach roughly parity with the recursive approach. But at least on my computer, the cost of accessing heap memory is bigger than the cost of the recursive call.
But this discussion is mostly moot because recursive tree walking is incorrect. If you have a large enough tree, you will run out of callstack space which is why an iterative algorithm must be used.
How to strip HTML tags from string in JavaScript?
var html = "<p>Hello, <b>World</b>";
var div = document.createElement("div");
div.innerHTML = html;
alert(div.innerText); // Hello, World
That pretty much the best way of doing it, you're letting the browser do what it does best -- parse HTML.
Edit: As noted in the comments below, this is not the most cross-browser solution. The most cross-browser solution would be to recursively go through all the children of the element and concatenate all text nodes that you find. However, if you're using jQuery, it already does it for you:
alert($("<p>Hello, <b>World</b></p>").text());
Check out the text method.
Best C++ Code Formatter/Beautifier
AStyle can be customized in great detail for C++ and Java (and others too)
This is a source code formatting tool.
clang-format is a powerful command line tool bundled with the clang compiler which handles even the most obscure language constructs in a coherent way.
It can be integrated with Visual Studio, Emacs, Vim (and others) and can format just the selected lines (or with git/svn to format some diff).
It can be configured with a variety of options listed here.
When using config files (named .clang-format) styles can be per directory - the closest such file in parent directories shall be used for a particular file.
Styles can be inherited from a preset (say LLVM or Google) and can later override different options
It is used by Google and others and is production ready.
Also look at the project UniversalIndentGUI. You can experiment with several indenters using it: AStyle, Uncrustify, GreatCode, ... and select the best for you. Any of them can be run later from a command line.
Uncrustify has a lot of configurable options. You'll probably need Universal Indent GUI (in Konstantin's reply) as well to configure it.
Should __init__() call the parent class's __init__()?
If you need something from super's __init__ to be done in addition to what is being done in the current class's __init__, you must call it yourself, since that will not happen automatically. But if you don't need anything from super's __init__, no need to call it. Example:
>>> class C(object):
def __init__(self):
self.b = 1
>>> class D(C):
def __init__(self):
super().__init__() # in Python 2 use super(D, self).__init__()
self.a = 1
>>> class E(C):
def __init__(self):
self.a = 1
>>> d = D()
>>> d.a
1
>>> d.b # This works because of the call to super's init
1
>>> e = E()
>>> e.a
1
>>> e.b # This is going to fail since nothing in E initializes b...
Traceback (most recent call last):
File "<pyshell#70>", line 1, in <module>
e.b # This is going to fail since nothing in E initializes b...
AttributeError: 'E' object has no attribute 'b'
__del__ is the same way, (but be wary of relying on __del__ for finalization - consider doing it via the with statement instead).
I rarely use __new__. I do all the initialization in __init__.
How to print binary tree diagram?
This is a very simple solution to print out a tree. It is not that pretty, but it is really simple:
enum { kWidth = 6 };
void PrintSpace(int n)
{
for (int i = 0; i < n; ++i)
printf(" ");
}
void PrintTree(struct Node * root, int level)
{
if (!root) return;
PrintTree(root->right, level + 1);
PrintSpace(level * kWidth);
printf("%d", root->data);
PrintTree(root->left, level + 1);
}
Sample output:
106
105
104
103
102
101
100
How to form tuple column from two columns in Pandas
Get comfortable with zip. It comes in handy when dealing with column data.
df['new_col'] = list(zip(df.lat, df.long))
It's less complicated and faster than using apply or map. Something like np.dstack is twice as fast as zip, but wouldn't give you tuples.
urllib and "SSL: CERTIFICATE_VERIFY_FAILED" Error
Try
pip install --trusted-host pypi.python.org packagename
It worked for me.
Does JavaScript have the interface type (such as Java's 'interface')?
there is no native interfaces in JavaScript, there are several ways to simulate an interface. i have written a package that does it
you can see the implantation here
Put content in HttpResponseMessage object?
For any T object you can do:
return Request.CreateResponse<T>(HttpStatusCode.OK, Tobject);
Check if an object belongs to a class in Java
Use the instanceof operator:
if(a instanceof MyClass)
{
//do something
}
How to clear the canvas for redrawing
context.clearRect(0,0,w,h)
fill the given rectangle with RGBA values :
0 0 0 0 : with Chrome
0 0 0 255 : with FF & Safari
But
context.clearRect(0,0,w,h);
context.fillStyle = 'rgba(0,0,0,1)';
context.fillRect(0,0,w,h);
let the rectangle filled with
0 0 0 255
no matter the browser !
Fling gesture detection on grid layout
Also as a minor enhancement.
The main reason for the try/catch block is that e1 could be null for the initial movement. in addition to the try/catch, include a test for null and return. similar to the following
if (e1 == null || e2 == null) return false;
try {
...
} catch (Exception e) {}
return false;
Which TensorFlow and CUDA version combinations are compatible?
I had installed CUDA 10.1 and CUDNN 7.6 by mistake. You can use following configurations (This worked for me - as of 9/10). :
- Tensorflow-gpu == 1.14.0
- CUDA 10.1
- CUDNN 7.6
- Ubuntu 18.04
But I had to create symlinks for it to work as tensorflow originally works with CUDA 10.
sudo ln -s /opt/cuda/targets/x86_64-linux/lib/libcublas.so /opt/cuda/targets/x86_64-linux/lib/libcublas.so.10.0
sudo cp /usr/lib/x86_64-linux-gnu/libcublas.so.10 /usr/local/cuda-10.1/lib64/
sudo ln -s /usr/local/cuda-10.1/lib64/libcublas.so.10 /usr/local/cuda-10.1/lib64/libcublas.so.10.0
sudo ln -s /usr/local/cuda/targets/x86_64-linux/lib/libcusolver.so.10 /usr/local/cuda/lib64/libcusolver.so.10.0
sudo ln -s /usr/local/cuda/targets/x86_64-linux/lib/libcurand.so.10 /usr/local/cuda/lib64/libcurand.so.10.0
sudo ln -s /usr/local/cuda/targets/x86_64-linux/lib/libcufft.so.10 /usr/local/cuda/lib64/libcufft.so.10.0
sudo ln -s /usr/local/cuda/targets/x86_64-linux/lib/libcudart.so /usr/local/cuda/lib64/libcudart.so.10.0
sudo ln -s /usr/local/cuda/targets/x86_64-linux/lib/libcusparse.so.10 /usr/local/cuda/lib64/libcusparse.so.10.0
And add the following to my ~/.bashrc -
export PATH=/usr/local/cuda/bin:$PATH
export LD_LIBRARY_PATH=/usr/local/cuda/lib64:$LD_LIBRARY_PATH
export PATH=/usr/local/cuda-10.1/bin:$PATH
export LD_LIBRARY_PATH=/usr/local/cuda-10.1/lib64:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/cuda/targets/x86_64-linux/lib/
Looping from 1 to infinity in Python
def to_infinity():
index = 0
while True:
yield index
index += 1
for i in to_infinity():
if i > 10:
break
How to decode encrypted wordpress admin password?
MD5 encrypting is possible, but decrypting is still unknown (to me). However, there are many ways to compare these things.
Using compare methods like so:
<?php $db_pass = $P$BX5675uhhghfhgfhfhfgftut/0; $my_pass = "mypass"; if ($db_pass === md5($my_pass)) { // password is matched } else { // password didn't match }Only for WordPress users. If you have access to your PHPMyAdmin, focus you have because you paste that hashing here: $P$BX5675uhhghfhgfhfhfgftut/0, WordPress
user_passis not only MD5 format it also usesutf8_mb4_clicharset so what to do?That's why I use another Approach if I forget my WordPress password I use
I install other WordPress with new password :P, and I then go to PHPMyAdmin and copy that hashing from the database and paste that hashing to my current PHPMyAdmin password ( which I forget )
EASY is use this :
- password = "ARJUNsingh@123"
- password_hasing = " $P$BDSdKx2nglM.5UErwjQGeVtVWvjEvD1 "
- Replace your $P$BX5675uhhghfhgfhfhfgftut/0 with my $P$BDSdKx2nglM.5UErwjQGeVtVWvjEvD1
I USE THIS APPROACH FOR MY SELF WHEN I DESIGN THEMES AND PLUGINS
WORDPRESS USE THIS
https://developer.wordpress.org/reference/functions/wp_hash_password/
At least one JAR was scanned for TLDs yet contained no TLDs
(tomcat 7.0.32) I had problems to see debug messages althought was enabling TldLocationsCache row in tomcat/conf/logging.properties file. All I could see was a warning but not what libs were scanned. Changed every loglevel tried everything no luck. Then I went rogue debug mode (=remove one by one, clean install etc..) and finally found a reason.
My webapp had a customized tomcat/webapps/mywebapp/WEB-INF/classes/logging.properties file. I copied TldLocationsCache row to this file, finally I could see jars filenames.
# To see debug messages in TldLocationsCache, uncomment the following line: org.apache.jasper.compiler.TldLocationsCache.level = FINE
How to declare a type as nullable in TypeScript?
Just add a question mark ? to the optional field.
interface Employee{
id: number;
name: string;
salary?: number;
}
How to remove a character at the end of each line in unix
This Perl code removes commas at the end of the line:
perl -pe 's/,$//' file > file.nocomma
This variation still works if there is whitespace after the comma:
perl -lpe 's/,\s*$//' file > file.nocomma
This variation edits the file in-place:
perl -i -lpe 's/,\s*$//' file
This variation edits the file in-place, and makes a backup file.bak:
perl -i.bak -lpe 's/,\s*$//' file
X-Frame-Options Allow-From multiple domains
Strictly speaking no, you cant.
You can however specify X-Frame-Options: mysite.com and therefore allow subdomain1.mysite.com and subdomain2.mysite.com. But yes, that's still one domain. There happens to be some workaround for this, but I think it's easiest to read that directly at the RFC specs: https://tools.ietf.org/html/rfc7034
It's also worth to point out that the Content-Security-Policy (CSP) header's frame-ancestor directive obsoletes X-Frame-Options. Read more here.
Contains case insensitive
You can try this
str = "Wow its so COOL"_x000D_
searchStr = "CoOl"_x000D_
_x000D_
console.log(str.toLowerCase().includes(searchStr.toLowerCase()))How do you determine the ideal buffer size when using FileInputStream?
Reading files using Java NIO's FileChannel and MappedByteBuffer will most likely result in a solution that will be much faster than any solution involving FileInputStream. Basically, memory-map large files, and use direct buffers for small ones.
Python data structure sort list alphabetically
ListName.sort() will sort it alphabetically. You can add reverse=False/True in the brackets to reverse the order of items: ListName.sort(reverse=False)
How do you define a class of constants in Java?
My preferred method is not to do that at all. The age of constants pretty much died when Java 5 introduced typesafe enums. And even before then Josh Bloch published a (slightly more wordy) version of that, which worked on Java 1.4 (and earlier).
Unless you need interoperability with some legacy code there's really no reason to use named String/integer constants anymore.
Fix CSS hover on iPhone/iPad/iPod
I successfully used
(function(l){var i,s={touchend:function(){}};for(i in s)l.addEventListener(i,s)})(document);
which was documented on http://fofwebdesign.co.uk/template/_testing/ios-sticky-hover-fix.htm
so a variation of Andrew M answer.
VBA changing active workbook
Use ThisWorkbook which will refer to the original workbook which holds the code.
Alternatively at code start
Dim Wb As Workbook
Set Wb = ActiveWorkbook
sample code that activates all open books before returning to ThisWorkbook
Sub Test()
Dim Wb As Workbook
Dim Wb2 As Workbook
Set Wb = ThisWorkbook
For Each Wb2 In Application.Workbooks
Wb2.Activate
Next
Wb.Activate
End Sub
Removing Java 8 JDK from Mac
Managing Java versions on Mac OSX is a nightmare. I recently switched over to using JDK 1.7, deleting JDK 6 from my MacBook entirely (I also had traces of JDK 5 - this laptop has been updated a few times).
Here's what I did to move to JDK 7.
1) download the latest from Oracle (http://www.oracle.com/technetwork/java/javase/downloads/index.html) and install it.
2) Remove (using rm - if you've got backups, you can revert if you make a mistake) all the JDK6 and JRE6 files.
At this stage, you should see:
% ls /Library/Java/JavaVirtualMachines/
jdk1.7.0_nn.jdk
(and nothing else)
3) In the folder /Library/Java/Extensions/, you'll need to remove all the old jar files, the ones that correspond to other releases of Java. If you don't, you'll get the infamous message about the wrong version of tools.jar (see Builds failing after upgrading to Java7, Missing Tools.jar and bad class versions). It is not enough to rename the jar files, because Java will open every jar in that folder - I moved mine into a sub-directory. It's safe to remove them once you know everything else works.
I haven't found I need to set JAVA_HOME for simple things.
Note: I just tried running IntelliJ and it will not start unless you have Apple's JDK 6 installed (see http://youtrack.jetbrains.com/issue/IDEA-93710). Same is true for Eclipse. Netbeans works fine.
iTunes Connect Screenshots Sizes for all iOS (iPhone/iPad/Apple Watch) devices
The following resolutions are acceptable to iTunes connect:
- iPhone 3+4 (3.5 Inch)
- 640 x 960
- iPhone 5, iPhone 5S, iPhone 5C (4 Inch)
- 640 x 1136
- iPhone 6, iPhone 6S, iPhone 7, iPhone 8 (4.7 Inch)
- 750 x 1334
- iPhone 6 Plus, iPhone 6S Plus, iPhone 7 Plus, iPhone 8 Plus (5.5 Inch)
- 1242 x 2208
- You need the screenshot in this resolution, the phone scales them down to 1080 x 1920
- iPhone X (5.8 Inch)
- 1125 x 2436
- iPhone XR (6.1 Inch)
- 828 x 1792
- iPhone XS (5.8 Inch)
- 1125 x 2436
- iPhone XS Max (6.5 Inch)
- 1242 x 2688
- iPad Mini 2, iPad Mini 3, iPad Mini 4 (7.9 Inch)
- 1536 x 2048
- iPad 3, iPad 4, iPad Pro, iPad Air, iPad Air 2 (9.7 Inch)
- 1536 x 2048
- iPad Pro (10.5 Inch)
- 1668 x 2224
- iPad Pro (12.9 Inch)
- 2048 x 2732
- Apple Watch Series 1, Apple Watch Series 2, Apple Watch Series 3 - 38mm (1.5 Inch)
- 272 x 340
- Apple Watch Series 4 - 40mm (1.57 Inch)
- 394 x 324
- Apple Watch Series 1, Apple Watch Series 2, Apple Watch Series 3 - 42mm (1.65 Inch)
- 312 x 390
- Apple Watch Series 4 - 44mm (1.78 Inch)
- 448 x 368
Hope this helps. Even Apple's Documentation on the matter is incomplete.
Update: Apple has introduced a new Media Manager which requires only that you create artwork for the largest iPhone and/or iPad devices. The smaller images will be created for you. Note that if you hadn't been creating iPad Pro images before, you have to now (if you support iPad).
Update: Screenshots and app previews for new devices now supported.
How do I remove the height style from a DIV using jQuery?
maybe something like
$('div#someDiv').css("height", "auto");
How to synchronize a static variable among threads running different instances of a class in Java?
If you're simply sharing a counter, consider using an AtomicInteger or another suitable class from the java.util.concurrent.atomic package:
public class Test {
private final static AtomicInteger count = new AtomicInteger(0);
public void foo() {
count.incrementAndGet();
}
}
How to uncheck checked radio button
try this
var radio_button=false;_x000D_
$('.radio-button').on("click", function(event){_x000D_
var this_input=$(this);_x000D_
if(this_input.attr('checked1')=='11') {_x000D_
this_input.attr('checked1','11')_x000D_
} else {_x000D_
this_input.attr('checked1','22')_x000D_
}_x000D_
$('.radio-button').prop('checked', false);_x000D_
if(this_input.attr('checked1')=='11') {_x000D_
this_input.prop('checked', false);_x000D_
this_input.attr('checked1','22')_x000D_
} else {_x000D_
this_input.prop('checked', true);_x000D_
this_input.attr('checked1','11')_x000D_
}_x000D_
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>_x000D_
<input type='radio' class='radio-button' name='re'>_x000D_
<input type='radio' class='radio-button' name='re'>_x000D_
<input type='radio' class='radio-button' name='re'>error Failed to build iOS project. We ran "xcodebuild" command but it exited with error code 65
If you don't have cocoa pods installed you need to:
sudo gem install cocoapods
Then run:
cd /ios
pod install
delete the build folder in ios folder of your react native project
run:
react-native run-ios
if error persists:
- delete
buildfolder again - open the
/iosfolder in Xcode - navigate File -> Project Settings -> Build System -> change (Shared workspace settings and Per-User workspace settings): Build System -> Legacy Build System
How can I convert a string to upper- or lower-case with XSLT?
<xsl:variable name="upper">UPPER CASE</xsl:variable>
<xsl:variable name="lower" select="translate($upper,'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')"/>
<xsl:value-of select ="$lower"/>
//displays UPPER CASE as upper case
Can (domain name) subdomains have an underscore "_" in it?
Clarifying bortzmeyer and David Tonhofer, domain name and subdomain name labels can contain leading underscores, but nowhere else.
As David Tonhofer wrote, labels are the in-between-the-periods parts and should follow the LDH rule except when specifying service labels and port labels to differentiate them from regular labels. Then they must occur at the beginning of the label which should be the "Short Names" from the Service Name and Port Number Registry, the port number with no leading 0s, or the protocol (ie. tcp, udp). These service labels are further limited to 15 characters.
- RFC2782 specifies prefixing service record subdomains with underscores.
- RFC6698 specifies prefixing port numbers with underscores in TLSA certificate records.
Contrary to David Tonhofer's answer, IDN does not allows for encoding underscore ('_' U+005F LOW LINE) or any other invalid ASCII character.
From RFC5890
[..] two new subsets of LDH labels are created by the introduction of IDNA. These are called Reserved LDH labels (R-LDH labels) and Non-Reserved LDH labels (NR-LDH labels). Reserved LDH labels, known as "tagged domain names" in some other contexts, have the property that they contain "--" in the third and fourth characters but which otherwise conform to LDH label rules.
Punycode encodes all ASCII codepoints as ASCII directly, including underscore. The resulting R-LDH would not conform the the LDH label rules. For example, S_.com would be encoded as xn--_-zmb.com which violates the rules. There may be a homographic codepoint which looks like an underscore that can be coded legally (perhaps '_' U+FF3F fullwidth low line), but these kinds of codepoints would be categorized as DISALLOWED by RFC5892 under 2.3 IgnorableProperties as a Noncharacter_Code_Point.
RACE (the other proposed IDN encoding scheme) was not accepted as a standard by IETF and should not be used.
Install pdo for postgres Ubuntu
Pecl PDO package is now deprecated. By the way the debian package php5-pgsql now includes both the regular and the PDO driver, so just:
apt-get install php-pgsql
Apache also needs to be restarted before sites can use it:
sudo systemctl restart apache2
How do I toggle an element's class in pure JavaScript?
I know that I am late but, I happen to see this and I have a suggestion.. For those looking for cross-browser support, I wouldn't recommend class toggling via JS. It may be a little more work but it is more supported through all browsers.
document.getElementById("myButton").addEventListener('click', themeswitch);
function themeswitch() {
const Body = document.body
if (Body.style.backgroundColor === 'white') {
Body.style.backgroundColor = 'black';
} else {
Body.style.backgroundColor = 'white';
}
}body {
background: white;
}<button id="myButton">Switch</button>"unary operator expected" error in Bash if condition
Took me a while to find this but note that if you have a spacing error you will also get the same error:
[: =: unary operator expected
Correct:
if [ "$APP_ENV" = "staging" ]
vs
if ["$APP_ENV" = "staging" ]
As always setting -x debug variable helps to find these:
set -x
How do I add a simple jQuery script to WordPress?
The solutions I've seen are from the perspective of adding javascript features to a theme. However, the OP asked, specifically, "How exactly do I add it for a single WordPress page?" This sounds like it might be how I use javascript in my Wordpress blog, where individual posts may have different javascript-powered "widgets". For instance, a post might let the user change variables (sliders, checkboxes, text input fields), and plots or lists the results.
Starting from the JavaScript perspective:
- Write your JavaScript functions in a separate “.js” file
Don’t even think about including significant JavaScript in your post’s html—create a JavaScript file, or files, with your code.
- Interface your JavaScript with your post's html
If your JavaScript widget interacts with html controls and fields, you’ll need to understand how to query and set those elements from JavaScript, and also how to let UI elements call your JavaScript functions. Here are a couple of examples; first, from JavaScript:
var val = document.getElementById(“AM_Freq_A_3”).value;
And from html:
<input type="range" id="AM_Freq_A_3" class="freqSlider" min="0" max="1000" value="0" oninput='sliderChanged_AM_widget(this);'/>
- Use jQuery to call your JavaScript widget’s initialization function
Add this to your .js file, using the name of your function that configures and draws your JavaScript widget when the page is ready for it:
jQuery(document).ready(function( $ ) {
your_init_function();
});
- In your post’s html code, load the scripts needed for your post
In the Wordpress code editor, I typically specify the scripts at the end of the post. For instance, I have a scripts folder in my main directory. Inside I have a utilities directory with common JavaScript that some of my posts may share—in this case some of my own math utility function and the flotr2 plotting library. I find it more convenient to group the post-specific JavaScript in another directory, with subdirectories based on date instead of using the media manager, for instance.
<script type="text/javascript" src="/scripts/utils/flotr2.min.js"></script>
<script type="text/javascript" src="/scripts/utils/math.min.js"></script>
<script type="text/javascript" src="/scripts/widgets/20161207/FreqRes.js"></script>
- Enqueue jQuery
Wordpress registers jQuery, but it isn’t available unless you tell Wordpress you need it, by enqueuing it. If you don’t, the jQuery command will fail. Many sources tell you how to add this command to your functions.php, but assume you know some other important details.
First, it’s a bad idea to edit a theme—any future update of the theme will wipe out your changes. Make a child theme. Here’s how:
https://developer.wordpress.org/themes/advanced-topics/child-themes/
The child’s functions.php file does not override the parent theme’s file of the same name, it adds to it. The child-themes tutorial suggest how to enqueue the parent and child style.css file. We can simply add another line to that function to also enqueue jQuery. Here's my entire functions.php file for the child theme:
<?php
add_action( 'wp_enqueue_scripts', 'earlevel_scripts_enqueue' );
function earlevel_scripts_enqueue() {
// styles
$parent_style = 'parent-style';
wp_enqueue_style( $parent_style, get_template_directory_uri() . '/style.css' );
wp_enqueue_style( 'child-style',
get_stylesheet_directory_uri() . '/style.css',
array( $parent_style ),
wp_get_theme()->get('Version')
);
// posts with js widgets need jquery
wp_enqueue_script('jquery');
}
Delete keychain items when an app is uninstalled
@amro's answer translated to Swift 4.0:
if UserDefaults.standard.object(forKey: "FirstInstall") == nil {
UserDefaults.standard.set(false, forKey: "FirstInstall")
UserDefaults.standard.synchronize()
}
How to capture a JFrame's close button click event?
import javax.swing.JOptionPane;
import javax.swing.JFrame;
/*Some piece of code*/
frame.addWindowListener(new java.awt.event.WindowAdapter() {
@Override
public void windowClosing(java.awt.event.WindowEvent windowEvent) {
if (JOptionPane.showConfirmDialog(frame,
"Are you sure you want to close this window?", "Close Window?",
JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE) == JOptionPane.YES_OPTION){
System.exit(0);
}
}
});
If you also want to prevent the window from closing unless the user chooses 'Yes', you can add:
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
iPhone App Development on Ubuntu
Not officially, no. It's just Objective-C though and the compiler's open source - you could probably get the headers and compile it and somehow get the binary on the device. Another option is compiling on the device. All these options will require jailbreaking though.
A Mac Mini is just $599...
Angular 2 declaring an array of objects
I assume you're using typescript.
To be extra cautious you can define your type as an array of objects that need to match certain interface:
type MyArrayType = Array<{id: number, text: string}>;
const arr: MyArrayType = [
{id: 1, text: 'Sentence 1'},
{id: 2, text: 'Sentence 2'},
{id: 3, text: 'Sentence 3'},
{id: 4, text: 'Sentenc4 '},
];
Or short syntax without defining a custom type:
const arr: Array<{id: number, text: string}> = [...];
How do I concatenate strings with variables in PowerShell?
Try the Join-Path cmdlet:
Get-ChildItem c:\code\*\bin\* -Filter *.dll | Foreach-Object {
Join-Path -Path $_.DirectoryName -ChildPath "$buildconfig\$($_.Name)"
}
Java: Rotating Images
This is how you can do it. This code assumes the existance of a buffered image called 'image' (like your comment says)
// The required drawing location
int drawLocationX = 300;
int drawLocationY = 300;
// Rotation information
double rotationRequired = Math.toRadians (45);
double locationX = image.getWidth() / 2;
double locationY = image.getHeight() / 2;
AffineTransform tx = AffineTransform.getRotateInstance(rotationRequired, locationX, locationY);
AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_BILINEAR);
// Drawing the rotated image at the required drawing locations
g2d.drawImage(op.filter(image, null), drawLocationX, drawLocationY, null);
Instagram API - How can I retrieve the list of people a user is following on Instagram
You can use Phantombuster. Instagram has set some rate limit, so you will have to use either multiple accounts or wait for 15 minutes for the next run.
What is the purpose of shuffling and sorting phase in the reducer in Map Reduce Programming?
I thought of just adding some points missing in above answers. This diagram taken from here clearly states the what's really going on.
If I state again the real purpose of
Split: Improves the parallel processing by distributing the processing load across different nodes (Mappers), which would save the overall processing time.
Combine: Shrinks the output of each Mapper. It would save the time spending for moving the data from one node to another.
Sort (Shuffle & Sort): Makes it easy for the run-time to schedule (spawn/start) new reducers, where while going through the sorted item list, whenever the current key is different from the previous, it can spawn a new reducer.
Add inline style using Javascript
A few people have an example using setAttribute which I like. However it assumes you don't have any styles currently set. I would maybe do something like:
nFilter.setAttribute('style', nFilter.getAttribute('style') + ';width:330px;float:left;');
Or make it into a helper function like this:
function setStyle(el, css){
el.setAttribute('style', el.getAttribute('style') + ';' + css);
}
setStyle(nFilter, 'width:330px;float:left;');
This makes sure that you can add styles to it continuously and it won't remove any style currently set by always appending to the current styles. It also adds an extra semi colon so that if there is a style ever missing one it will append another to make sure it is fully delimited.
connecting to phpMyAdmin database with PHP/MySQL
Set up a user, a host the user is allowed to talk to MySQL by using (e.g. localhost), grant that user adequate permissions to do what they need with the database .. and presto.
The user will need basic CRUD privileges to start, that's sufficient to store data received from a form. The rest of the permissions are self explanatory, i.e. permission to alter tables, etc. Give the user no more, no less power than it needs to do its work.
Using the "start" command with parameters passed to the started program
Change The "Virtual PC.exe" to a name without space like "VirtualPC.exe" in the folder.
When you write start "path" with "" the CMD starts a new cmd window with the path as the title.
Change the name to a name without space,write this on Notepad and after this save like Name.cmd or Name.bat:
CD\
CD Program Files
CD Microsoft Virtual PC
start VirtualPC.exe
timeout 2
exit
This command will redirect the CMD to the folder,start the VirualPC.exe,wait 2 seconds and exit.
Pattern matching using a wildcard
If you really do want to use wildcards to identify specific variables, then you can use a combination of ls() and grep() as follows:
l = ls()
vars.with.result <- l[grep("result", l)]
Django - iterate number in for loop of a template
[Django HTML template doesn't support index as of now], but you can achieve the goal:
If you use Dictionary inside Dictionary in views.py then iteration is possible using key as index. example:
{% for key, value in DictionartResult.items %} <!-- dictionartResult is a dictionary having key value pair-->
<tr align="center">
<td bgcolor="Blue"><a href={{value.ProjectName}}><b>{{value.ProjectName}}</b></a></td>
<td> {{ value.atIndex0 }} </td> <!-- atIndex0 is a key which will have its value , you can treat this key as index to resolve-->
<td> {{ value.atIndex4 }} </td>
<td> {{ value.atIndex2 }} </td>
</tr>
{% endfor %}
Elseif you use List inside dictionary then not only first and last iteration can be controlled, but all index can be controlled. example:
{% for key, value in DictionaryResult.items %}
<tr align="center">
{% for project_data in value %}
{% if forloop.counter <= 13 %} <!-- Here you can control the iteration-->
{% if forloop.first %}
<td bgcolor="Blue"><a href={{project_data}}><b> {{ project_data }} </b></a></td> <!-- it will always refer to project_data[0]-->
{% else %}
<td> {{ project_data }} </td> <!-- it will refer to all items in project_data[] except at index [0]-->
{% endif %}
{% endif %}
{% endfor %}
</tr>
{% endfor %}
End If ;)
// Hope have covered the solution with Dictionary, List, HTML template, For Loop, Inner loop, If Else. Django HTML Documentaion for more methods: https://docs.djangoproject.com/en/2.2/ref/templates/builtins/
mailto link with HTML body
Some things are possible, but not all, say for example you want line breaks, instead of using <br />use %0D%0A
Example:
<a href="mailto:?subject=&body=Hello,%0D%0A%0D%0AHere is the link to the PDF Brochure.%0D%0A%0D%0ATo view the brochure please click the following link: http://www.uyslist.com/yachts/brochure.pdf"><img src="images/email.png" alt="EMail PDF Brochure" /></a>
Can I Set "android:layout_below" at Runtime Programmatically?
Kotlin version with infix function
infix fun View.below(view: View) {
(this.layoutParams as? RelativeLayout.LayoutParams)?.addRule(RelativeLayout.BELOW, view.id)
}
Then you can write:
view1 below view2
Or you can call it as a normal function:
view1.below(view2)
IIS: Where can I find the IIS logs?
I'm adding this answer because after researching the web, I ended up at this answer but still didn't know which subfolder of the IIS logs folder to look in.
If your server has multiple websites, you will need to know the IIS ID for the site. An easy way to get this in IIS is to simply click on the Sites folder in the left panel. The ID for each site is shown in the right panel.
Once you know the ID, let's call it n, the corresponding logs are in the W3SVCn subfolder of the IIS logs folder. So, if your website ID is 4, say, and the IIS logs are in the default location, then the logs are in this folder:
%SystemDrive%\inetpub\logs\LogFiles\W3SVC4
Acknowlegements:
- Answer by @jishi tells where the logs are by default.
- Answer by @Rafid explains how to find actual location (maybe not default).
- Answer by @Bergius gives a programmatic way to find the log folder location for a specific website, taking ID into account, without using IIS.
Efficiently finding the last line in a text file
If you do know the maximal length of a line, you can do
def getLastLine(fname, maxLineLength=80):
fp=file(fname, "rb")
fp.seek(-maxLineLength-1, 2) # 2 means "from the end of the file"
return fp.readlines()[-1]
This works on my windows machine. But I do not know what happens on other platforms if you open a text file in binary mode. The binary mode is needed if you want to use seek().
Get querystring from URL using jQuery
Have a look at this Stack Overflow answer.
function getParameterByName(name, url) {
if (!url) url = window.location.href;
name = name.replace(/[\[\]]/g, "\\$&");
var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
results = regex.exec(url);
if (!results) return null;
if (!results[2]) return '';
return decodeURIComponent(results[2].replace(/\+/g, " "));
}
You can use the method to animate:
I.e.:
var thequerystring = getParameterByName("location");
$('html,body').animate({scrollTop: $("div#" + thequerystring).offset().top}, 500);
How to assign pointer address manually in C programming language?
Your code would be like this:
int *p = (int *)0x28ff44;
int needs to be the type of the object that you are referencing or it can be void.
But be careful so that you don't try to access something that doesn't belong to your program.
Can I exclude some concrete urls from <url-pattern> inside <filter-mapping>?
I don't think you can, the only other configuration alternative is to enumerate the paths that you want to be filtered, so instead of /* you could add some for /this/* and /that/* etc, but that won't lead to a sufficient solution when you have alot of those paths.
What you can do is add a parameter to the filter providing an expression (like a regular expression) which is used to skip the filter functionality for the paths matched. The servlet container will still call your filter for those url's but you will have better control over the configuration.
Edit
Now that you mention you have no control over the filter, what you could do is either inherit from that filter calling super methods in its methods except when the url path you want to skip is present and follow the filter chain like @BalusC proposed, or build a filter which instantiates your filter and delegates under the same circumstances. In both cases the filter parameters would include both the expression parameter you add and those of the filter you inherit from or delegate to.
The advantage of building a delegating filter (a wrapper) is that you can add the filter class of the wrapped filter as parameter and reuse it in other situations like this one.