查找路径是否存在，包括根目录。& 检测磁盘剩余空间

BOOL   bRet=PathFileExists(strFileName);   

  
 Header:   shlwapi.h     
 Import   library:   shlwapi.lib  

// 检测磁盘剩余空间
// cDiskID: 磁盘盘符
// FreeDiskSpaceLimit: 剩余空间限制
UINT HardDiskOfCapacityCheck(char cDiskID, ULONG FreeDiskSpaceLimit)
{
 　　_ULARGE_INTEGER n64TotalNumberOfBytes, n64TotalNumberOfFreeBytes;
　　 __int64 n64TotalFree = 0, n64TotalSpace = 0;

 　　char crDrv[3];
　　// CStringArray strArray;

 　　sprintf(crDrv, "%c:\\",cDiskID);

 　　UINT nDrvType = GetDriveType((LPCTSTR)crDrv);

　　 if (nDrvType != DRIVE_FIXED)
 　　{
  　　　　return NOT_DISK;
 　　}
 　　BOOL bSuccess = SHGetDiskFreeSpaceEx((LPCTSTR)crDrv, NULL, &n64TotalNumberOfBytes, \
                       &n64TotalNumberOfFreeBytes);
 　　if (!bSuccess)
 　　{
  　　　　return STATE_ERROR;
 　　}

 　　n64TotalSpace = (ULONG)n64TotalNumberOfBytes.QuadPart/1024;
 　　n64TotalFree  = (ULONG)n64TotalNumberOfFreeBytes.QuadPart/1024;

 　　if (n64TotalFree < FreeDiskSpaceLimit)
 　　{
  　　　　return LACK_OF_DISK;
 　　}
 　　return SUFFICIENT_OF_DISK;

}