if you run this code what happens?
HANDLE handle;
DWORD m\_Pos,m\_NumberofFile=0;
handle=CreateFile(\_T("e:\\\\1.bmp"),
GENERIC_READ,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
dwPos = SetFilePointer(handle, 0, NULL, FILE_END);
LockFile(handle, m_Pos, 0, m_NumberofFile, 0);
