Windows/WinCE應用程序防止重複打開

m_hMutex = OpenMutex( MUTEX_ALL_ACCESS, FALSE, strClassName);
if(m_hMutex   ==   NULL) 
{ 
m_hMutex   =   CreateMutex(NULL,   TRUE,   strClassName); 
} 
else 
{ 
AfxMessageBox( "FTPServer already running! ", MB_ICONEXCLAMATION ); 
::PostMessage( this->m_hWnd, WM_CLOSE, 0, 0 );
return FALSE; 
}