GetVolumeNameForVolumeMountPoint.Cpp

/*
GetVolumeNameForVolumeMountPoint.Cpp
参考：
http://msdn.microsoft.com/en-us/library/windows/desktop/aa365238(v=vs.85).aspx
http://msdn.microsoft.com/en-us/library/windows/desktop/aa364037(v=vs.85).aspx
http://msdn.microsoft.com/en-us/library/windows/desktop/aa365717(v=vs.85).aspx
*/

#include <Windows.h>

#define BUFSIZE MAX_PATH

int MountedFolder( TCHAR * szVolumeMountPoint , TCHAR * szVolumeMountPoint2 )
{
    BOOL bFlag;
    TCHAR Buf[BUFSIZE];     // temporary buffer for volume name

    // We should do some error checking on the inputs. Make sure there
    // are colons and backslashes in the right places, and so on
    bFlag = GetVolumeNameForVolumeMountPoint(
        szVolumeMountPoint2, // input volume mount point or directory
        Buf, // output volume name buffer
        BUFSIZE);  // size of volume name buffer      
    if (bFlag != TRUE) {
        int x = GetLastError();//2 系统找不到指定的文件。
        return (-2);
    }

    //_tprintf( TEXT("Volume name of %s is %s\n"), argv[2], Buf );
    bFlag = SetVolumeMountPoint(
        szVolumeMountPoint, // mount point
        Buf);  // volume to be mounted      
    if (bFlag == 0) {
        int x = GetLastError();
        x = 0;//目录不是空的。 0x00000091 还有0x57 系统找不到指定的文件。
    }

    return (bFlag);
}

void EnumeratingVolumeGUIDPaths()
{
    BOOL bFlag;
    TCHAR Buf[BUFSIZE];           // temporary buffer for volume name
    TCHAR Drive[] = TEXT("c:\\"); // template drive specifier
    TCHAR I;                      // generic loop counter

    // Walk through legal drive letters, skipping floppies.
    for (I = TEXT('c'); I < TEXT('z');  I++ )
    {
        // Stamp the drive for the appropriate letter.
        Drive[0] = I;

        bFlag = GetVolumeNameForVolumeMountPoint(
            Drive,     // input volume mount point or directory
            Buf,       // output volume name buffer
            BUFSIZE ); // size of volume name buffer
        if (bFlag)  {
            _tprintf (TEXT("The ID of drive \"%s\" is \"%s\"\n"), Drive, Buf);
        }
    }
}

int _tmain(int argc, _TCHAR* argv[])
{
    //这两个必须存在，不然返回错误。
    wchar_t * path = L"d:\\test\\";//必须为空。
    wchar_t * Volume = L"f:\\";

    int x =  MountedFolder(path , Volume );

    BOOL bFlag = DeleteVolumeMountPoint(path);// Path of the volume mount point

    EnumeratingVolumeGUIDPaths();

    return 0;
}