can't open drive by CreateFile("\\\\.\\C:")

[visor]

I'm using for open device
CreateFile("\\\\.\\C:", GENERIC_READ,FILE_SHARE_READ| FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);

it is working good if another application didn't open drive c: earlier.
How i must use this function or read disk t osolve this problem?

[Andreas Masur]

Well...always check the error code first...take a look at the following FAQ (http://www.codeguru.com/forum/showthread.php?t=318721)...

[visor]

error: File is used by another process.
Can i read disk by another method which hasn't problem like that?

[NoHero]

You always have to give FILE_SHARE_READ | FILE_SHARE_WRITE when opening a complet drive. And you cannot open the system partition where your Windows is on with write access. Only for read.