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Which comment style should I use in batch files?
... supported way to embed comments in batch files whereas :: is merely an artifact of a particular implementation.
Here is an example where :: produces a problem in a FOR loop.
This example will not work in a file called test.bat on your desktop:
@echo off
for /F "delims=" %%A in ('type C:\Users\...
How can I check if an element exists in the visible DOM?
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It seems some people are landing here, and simply want to know if an element exists (a little bit different to the original question).
That's as simple as using any of the browser's selecting method, and checking it for a truthy value (generally).
For example, if my element had an id o...
jquery $(window).width() and $(window).height() return different values when viewport has not been r
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Note that if the problem is being caused by appearing scrollbars, putting
body {
overflow: hidden;
}
in your CSS might be an easy fix (if you don't need the page to scroll).
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Is sizeof(bool) defined in the C++ language standard?
...d later, the same call yields 1. This can cause memory corruption problems if you have defined structure members of type bool in Visual C++ 4.2 and are mixing object files (OBJ) and/or DLLs built with the 4.2 and 5.0 or later compilers."
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Is there type Long in SQLite?
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Create the column as an INTEGER type:
db.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE_A + "("
+ KEY + " INTEGER" + ")");
Put the long value in INTEGER column:
contentValues.put(KEY, object.getLongValue());
db.insert(TABLE_A, null, contentValues);
Important: retrieve...
Stopping an Android app from console
...ll stop the app process and clear out all the stored data for that app.
If you're on Linux:
adb shell ps | grep com.myapp | awk '{print $2}' | xargs adb shell kill
That will only work for devices/emulators where you have root immediately upon running a shell. That can probably be refined slight...
How to change default timezone for Active Record in Rails?
...onfig.active_record.default_timezone determines whether to use Time.local (if set to :local) or Time.utc (if set to :utc) when pulling dates and times from the database. The default is :utc.
http://guides.rubyonrails.org/configuring.html
If you want to change Rails timezone, but continue to ha...
Converting int to bytes in Python 3
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It should also be noted that bytes([3]) is still different from what the OP wanted – namely the byte value used to encode the digit "3" in ASCII, ie. bytes([51]), which is b'3', not b'\x03'.
– lenz
Apr 1 '17 at 21:13
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String concatenation in MySQL
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MySQL is different from most DBMSs use of + or || for concatenation. It uses the CONCAT function:
SELECT CONCAT(first_name, " ", last_name) AS Name FROM test.student
As @eggyal pointed out in comments, you can enable string concaten...
Why does the Visual Studio editor show dots in blank spaces?
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Visual Studio is configured to show whitespace.
Press Ctrl+R, Ctrl+W.
If you are using C# keyboard mappings: (thanks Simeon)
Press Ctrl+E, S.
If you want to use the menu: (thanks angularsen)
Edit > Advanced > View White Space
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