互斥体单实例

BOOL CMutexApp::InitInstance() { ... m_handMutex = CreateMutex(NULL, TRUE, _T("互斥体单实例")); if (m_handMutex) { if (ERROR_ALREADY_EXISTS == GetLastError()) { AfxMessageBox(_T("实例已经运行！")); ReleaseMutex(m_handMutex); return FALSE; } } else { AfxMessageBox(_T("创建实例失败!")); return FALSE; } ... }