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m_hMutex = CreateMutex( NULL, TRUE, "MeinMutex_1" );
if ( m_hMutex )
{
if ( GetLastError() == ERROR_ALREADY_EXISTS )
{
// das Programm läuft schon, Meldung anzeigen, Programm beenden, Windows runterfahren, usw.
CloseHandle( m_hMutex );
return FALSE;
}
}
if ( m_hMutex )
{
ReleaseMutex( m_hMutex );
CloseHandle( m_hMutex );
m_hMutex = NULL;
}