只能打开一进程

#define MUTEX_NAME _T("shit")     //unicode环境下

/*#define MUTEX_NAME “shit"     //多字节环境下*/

if (NULL == OpenMutex(MUTEX_ALL_ACCESS, FALSE, MUTEX_NAME))
 {
  CreateMutex(NULL, FALSE, MUTEX_NAME);
 }
 else
 {
  exit (0);
 }