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What is the difference between NULL, '\0' and 0?
...implicitly checks "is not 0", so we reverse that to mean "is 0".
The following are INVALID ways to check for a null pointer:
int mynull = 0;
<some code>
if (pointer == mynull)
To the compiler this is not a check for a null pointer, but an equality check on two variables. This might work if...
How to identify platform/compiler from preprocessor macros?
I'm writing a cross-platform code, which should compile at linux, windows, Mac OS. On windows, I must support visual studio and mingw.
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Map a network drive to be used by a service
Suppose some Windows service uses code that wants mapped network drives and no UNC paths. How can I make the drive mapping available to the service's session when the service is started? Logging in as the service user and creating a persistent mapping will not establish the mapping in the context of...
How to see which plugins are making Vim slow?
... wondering, this doesn't exist in all vim/gvim distros. Doesn't in a stock Win Gvim 7.4 over here (though it is documented in viminfo)
– thynctank
Aug 26 '14 at 16:28
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Import a module from a relative path
..._file__ !!!
# __file__ fails if the script is called in different ways on Windows.
# __file__ fails if someone does os.chdir() before.
# sys.argv[0] also fails, because it doesn't not always contains the path.
As a bonus, this approach does let you force Python to use your module instead of the...
Setting href attribute at runtime
...lement.attr() function in jQuery.
To get the href attribute, use the following code:
var a_href = $('selector').attr('href');
To set the href attribute, use the following code:
$('selector').attr('href','http://example.com');
In both cases, please use the appropriate selector. If you have set...
How can I get a file's size in C? [duplicate]
....g.:
fseek(fp, 0L, SEEK_SET);
or (if seeking to go to the beginning)
rewind(fp);
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How to not run an example using roxygen2?
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this doesn't work for me (running on Win 10, 64 bit, R version 3.5.0)
– JBJ
Apr 26 '19 at 9:59
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Connect different Windows User in SQL Server Management Studio (2005 or later)
... there a way in SQL Server Management Studio 2005 (or later) to change the Windows Authentication user (as you could in SQL Server 2000 and older)?
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How to use QueryPerformanceCounter?
...bly my safest bet. (The warning on Boost::Posix that it may not works on Win32 API put me off a bit). However, I'm not really sure how to implement it.
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