BUG: GetDriveType Returns DRIVE_NO_ROOT_DIR for the Mount Point of an Empty Removable Media (244089)

RESOLUTION

As a workaround, you can use the GetVolumeNameForVolumeMountPoint function to obtain the actual drive name for the mount point, and then call GetDriveType on that. The following sample code demonstrates this workaround:

// Compiling for Windows 2000
#define _WIN32_WINNT    0x0500
 
#include <windows.h>
#include <tchar.h>
#include <stdio.h>


ULONG
GetMountPointDriveType(LPCTSTR lpRootPathName)
{
    _TCHAR lpszVolumeName[_MAX_PATH];

    SetLastError(ERROR_SUCCESS);
    if (lpRootPathName == NULL)
    {
        return GetDriveType(NULL);
    } 
    else if (!GetVolumeNameForVolumeMountPoint(lpRootPathName, 
        lpszVolumeName, _MAX_PATH))
    {
        return DRIVE_NO_ROOT_DIR;
    }

    return GetDriveType(lpszVolumeName);
}


void _tmain(int argc, _TCHAR *argv[])
{
    if (argc != 2) 
    {
        _tprintf(_T("Usage: %s PATHNAME\n"), argv[0]);
        return;
    }

    switch (GetMountPointDriveType(argv[1]))
    {
    case DRIVE_UNKNOWN:     
      _tprintf(_T("The drive type cannot be determined.\n")); 
      break;
    case DRIVE_NO_ROOT_DIR: 
      _tprintf(_T("The root path is invalid.\n")); 
      break;
    case DRIVE_REMOVABLE:   
      _tprintf(_T("The disk can be removed from the drive.\n")); 
      break;
    case DRIVE_FIXED:       
      _tprintf(_T("The disk cannot be removed from the drive.\n")); 
      break;
    case DRIVE_REMOTE:      
      _tprintf(_T("The drive is a remote (network) drive.\n")); 
      break;
    case DRIVE_CDROM:       
      _tprintf(_T("The drive is a CD-ROM drive.\n")); 
      break;
    case DRIVE_RAMDISK:     
      _tprintf(_T("The drive is a RAM disk.\n")); 
      break;
    default:                
      _tprintf(_T("BUG: Unrecognized drive type\n")); 
      break;
    }
}