I want to get system folder in windows, by reading SystemRoot. How can I do it? many thanks!
+1
A:
There's a windows API you should use instead: GetWindowsDirectory
But if you do want to read from the environment you can use GetEnvironmentVariable, or from the C runtime with getenv or even get the environment pointer from the unofficial third main argument int main(argc, argv, envp) which is supported by the VC runtime.
Rup
2010-07-01 08:43:28
+1 for good answer and the Microsoft '3rd argument to main' extension - it's always nice to learn something new.
Joe Gauterin
2010-07-01 08:50:17
It's not just Microsoft - pretty much everything does have envp. GNU Make relies on it even and that's supposed to just work out-of-the-box everywhere. The only system I've ever seen without it was Interix 2 (3+ has it though) and there's an exception in GNU Make for AmigaOS too I think.
Rup
2010-07-01 09:00:20
A:
This should be fairly easy with GetEnvironmentVariable():
DWORD WINAPI GetEnvironmentVariable(
__in_opt LPCTSTR lpName,
__out_opt LPTSTR lpBuffer,
__in DWORD nSize
);
See MSDN on GetEnvironmentVariable() for more infos and some examples (the function is used in Example 2)
Strayer
2010-07-01 08:44:48
+3
A:
If you want to read the environment variables, use getenv or GetEnvironmentVariable.
However, if you want to find the %SYSTEMROOT% directory consider using GetWindowsFolder
For other special folders, you can use SHGetKnownFolderPath or SHGetFolderPath
Joe Gauterin
2010-07-01 08:48:07