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define() vs. const
...ld only use this from within a class. This should be used when you want to set some kind of constant option or setting that pertains to that class. Or maybe you want to create some kind of enum.
define can be used for the same purpose, but it can only be used in the global scope. It should only be ...
Play audio from a stream using C#
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The SoundPlayer class can do this. It looks like all you have to do is set its Stream property to the stream, then call Play.
edit
I don't think it can play MP3 files though; it seems limited to .wav. I'm not certain if there's anything in the framework that can play an MP3 file directly. Eve...
Run automatically program on startup under linux ubuntu [closed]
...and symbolic links (ln).
Edit
At this point in the boot process PATH isn't set yet, so it is critical that absolute paths are used throughout. BUT, as pointed out in the comments by Steve HHH, explicitly declaring the full file path (/etc/init.d/filename) for the update-rc.d command is not valid in ...
How to remove Left property when position: absolute?
...Class"></div>
.myClass
{
position:absolute;
left:0;
}
When setting RTL, you could change to:
<div class="myClass rtl"></div>
.myClass
{
position:absolute;
left:0;
}
.myClass.rtl
{
left:auto;
right:0;
}
...
Tooltip on image
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I am set Tooltips On My Working Project That Is 100% Working
<!DOCTYPE html>
<html>
<style>
.tooltip {
position: relative;
display: inline-block;
border-bottom: 1px dotted black;
}
.tooltip ....
svn强制设定commit时写一定长度的日志 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...本（其实就是批处理文件）文件：pre-commit.bat
@echo off
setlocal
set REPOS=%1
set TXN=%2
rem check that logmessage contains at least 30 characters
c:\svnlook log "%REPOS%" -t "%TXN%" | findstr ".............................." > nul
if %errorlevel% gtr 0 goto err
exit 0
:err
...
How do I know the current width of system scrollbar?
... use the Control.ClientSize property.
From the documentation:
Gets or sets the height and width of the client area of the control.
The client area of a control is the bounds of the control, minus the nonclient elements such as scroll bars, borders, title bars, and menus.
...
A free tool to check C/C++ source code against a set of coding standards? [closed]
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Vera does not have a very comprehensive set of rules - but they are extendable (in TCL)
– fmuecke
Oct 8 '11 at 7:00
2
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Aggregate / summarize multiple variables per group (e.g. sum, mean)
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Using the data.table package, which is fast (useful for larger datasets)
https://github.com/Rdatatable/data.table/wiki
library(data.table)
df2 <- setDT(df1)[, lapply(.SD, sum), by=.(year, month), .SDcols=c("x1","x2")]
setDF(df2) # convert back to dataframe
Using the plyr package
req...
Getting the last argument passed to a shell script
... that for loop variables aren't scoped: they keep the last value they were set to.
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