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Environment Variables and Win32 API Functions

 
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nwongfeiying
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PostPosted: Sat Aug 21, 2010 2:29 pm    Post subject: Environment Variables and Win32 API Functions Reply with quote
I'm trying to use FindFirstFile and FindNextFile using %appdata%\\* as my argument. Why won't it work?

Code:
LPCTSTR lpFileName = _T("%appdata%\\Macromedia\\Flash Player\\#SharedObjects\\*");


Produces exit code 3.


Code:
LPCTSTR lpFileName = _T("%appdata%*");


Produces exit code 2.
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atom0s
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PostPosted: Sat Aug 21, 2010 3:07 pm    Post subject: This post has 1 review(s) Reply with quote
Not sure if FindFirstFile/NextFile will let you use environment variables inside the strings, which may be causing your exit codes.

Error code 2 is: file not found.
Error code 3 is: path not found.

Instead, you could try using getenv to obtain the environment variable first then append the rest to that.

You can also use:
- GetEnvironmentStrings
- GetEnvironmentVariable
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nwongfeiying
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PostPosted: Sat Aug 21, 2010 7:10 pm    Post subject: Reply with quote
Conversion disaster Sad I'm trying to append the rest of the path onto the LPCTSTR for FindFirstFile but I'm having trouble.

Suggestions?
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Slugsnack
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PostPosted: Sat Aug 21, 2010 7:20 pm    Post subject: Reply with quote
ExpandEnvironmentStrings()
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justa_dude
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PostPosted: Sun Aug 22, 2010 8:32 am    Post subject: Reply with quote
justa_dude <3 buffer overflow
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Slugsnack
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PostPosted: Sun Aug 22, 2010 10:50 am    Post subject: Reply with quote
That function takes a size parameter..
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nwongfeiying
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PostPosted: Sun Aug 22, 2010 11:19 am    Post subject: Reply with quote
Slugsnack wrote:
That function takes a size parameter..


Don't worry about it. I did this and it worked.

Quote:
LPTSTRING lpFileName = _tgetenv(_T("AppData"));

. . .

_tcscat(lpFileName, _T("\\Path\\To\\Folder\\*));


Thank you Wiccaan and Slugsnack.
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atom0s
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PostPosted: Sun Aug 22, 2010 4:42 pm    Post subject: Reply with quote
Be careful with things like that, you can lead into overflows and such.

MSDN wrote:
Returns a pointer to the environment table entry containing varname. It is not safe to modify the value of the environment variable using the returned pointer.


You can define paths with MAX_PATH and just append to the buffers. Such as:

Code:
TCHAR* lpEnvVar = _tgetenv( _T( "AppData" ) );
TCHAR tszFilePath[ MAX_PATH ] = { 0 };
_tcscpy_s( tszFilePath, MAX_PATH, lpEnvVar );
_tcscat_s( tszFilePath, MAX_PATH, _T( "\\Path\\To\\Folder\\*" ) );


Also with that, I'd suggest looking at the secured versions of the CRT library functions to prevent overflows and so on.

getenv_s:
http://msdn.microsoft.com/en-us/library/tb2sfw2z%28VS.80%29.aspx
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nwongfeiying
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PostPosted: Sun Aug 22, 2010 9:28 pm    Post subject: Reply with quote
Wiccaan wrote:
Be careful with things like that, you can lead into overflows and such.

MSDN wrote:
Returns a pointer to the environment table entry containing varname. It is not safe to modify the value of the environment variable using the returned pointer.


You can define paths with MAX_PATH and just append to the buffers. Such as:

Code:
TCHAR* lpEnvVar = _tgetenv( _T( "AppData" ) );
TCHAR tszFilePath[ MAX_PATH ] = { 0 };
_tcscpy_s( tszFilePath, MAX_PATH, lpEnvVar );
_tcscat_s( tszFilePath, MAX_PATH, _T( "\\Path\\To\\Folder\\*" ) );


Also with that, I'd suggest looking at the secured versions of the CRT library functions to prevent overflows and so on.

getenv_s:
http://msdn.microsoft.com/en-us/library/tb2sfw2z%28VS.80%29.aspx


Thanks Wiccaan. Areas that I always fall short on are these access violations because I'm doing something I'm not suppose to and overflows.
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