创建互斥体让程序只打开一次

最新推荐文章于 2021-09-22 20:32:51 发布

hnhyliuzhiyuan

最新推荐文章于 2021-09-22 20:32:51 发布

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CC 4.0 BY-SA版权

文章标签： dialog application initialization null features

本文链接：https://blog.youkuaiyun.com/hnhyliuzhiyuan/article/details/3876361

本文介绍了一个使用单例模式的音频播放器应用程序初始化过程。该应用通过创建互斥量来确保只运行一个实例，并在已有实例的情况下将其激活并调整音量。此外，还展示了如何使用 COM 初始化多线程环境及对话框的处理。

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// CAudioPlayerApp initialization

BOOL CAudioPlayerApp::InitInstance()
{
// Standard initialization
// If you are not using these features and wish to reduce the size
// of your final executable, you should remove from the following
// the specific initialization routines you do not need.
////////////////////////////////////////////////////////////////////
HANDLE hMutexOneInstantance;
hMutexOneInstantance=CreateMutex(NULL,TRUE,_T("AudioPlayer"));

if (GetLastError()==ERROR_ALREADY_EXISTS)
{
     HWND oldHWnd=FindWindow(NULL,_T("AudioPlayer"));
  if(oldHWnd != NULL)
  {
   ::SendMessage(oldHWnd,WM_VOLUME, 0 , 0);
   ::ShowWindow(oldHWnd,SW_SHOWNORMAL);
   ::SetForegroundWindow(oldHWnd);
  }
  return false;
}
if(hMutexOneInstantance)
     ReleaseMutex(hMutexOneInstantance);

HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
// CoInitialize(NULL);

    ////////////////////////////////////////////////////////////////////
CAudioPlayerDlg dlg;
m_pMainWnd = &dlg;
int nResponse = dlg.DoModal();
if (nResponse == IDOK)
{
  // TODO: Place code here to handle when the dialog is
  // dismissed with OK
}
else if (nResponse == IDCANCEL)
{
  // TODO: Place code here to handle when the dialog is
  // dismissed with Cancel
}

// Since the dialog has been closed, return FALSE so that we exit the
// application, rather than start the application's message pump.
return FALSE;
}