[MFC] Single app execute

檢查應用程式是否已經執行，已執行則將該程序顯示到最前面。

	BOOL CMyApp::InitInstance()
	{
	HANDLE hMutex = NULL;
	hMutex = CreateMutex(NULL, true, m_pszAppName);
	if (GetLastError() == ERROR_ALREADY_EXISTS)
	{
	CWnd* pFirstWnd = (CWnd::FindWindow(NULL, "My App Full Name"));
	if (pFirstWnd != NULL)
	{
	pFirstWnd->ShowWindow(SW_SHOWNORMAL);
	pFirstWnd->BringWindowToTop();
	pFirstWnd->GetLastActivePopup()->BringWindowToTop();
	}
	return(false);
	}
	}

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