[Project sorting] Win32 and MFC executable files can only run once

// Method 1: Execute an EXE file that controls the release version only once # In ifndef _ debug // debug version, project properties --> Preprocessor --> preprocessing definition: there are _ debugif (findwindow (null, _ T ("window title") // disadvantages of this method: When you first run a debug version of the EXE file, then, the release EXE file cannot run. The debug version affects the release version. The following method does not show this drawback {return false;} # endif // Method 2: the EXE file that controls the release version can only run once # ifndef _ debughandle hsem = createsemaphore (null, 1, 1, _ T ("softname_single_instance"); If (getlasterror () = error_already_exists) {closehandle (hsem); Return false ;}# endif