让单文档程序只运行一次

 

BOOL XXXXApp::InitInstance()下添加

 

 if(::OpenMutex(MUTEX_ALL_ACCESS,false,"521G")==NULL)
 {
  ::CreateMutex(NULL,false,"521G");
 }
 else
 {
  ::MessageBox(NULL,"程序已启动","警告",MB_OK|MB_ICONINFORMATION);
  return FALSE;
 }