AfxOleGetMessageFilter

检索应用程序当前消息筛选器。

COleMessageFilter* AFXAPI AfxOleGetMessageFilter( );

返回值

为当前消息筛选器的指针。

备注

可以像调用 AfxGetApp 访问当前应用程序对象，则调用此函数访问当前 COleMessageFilter派生的对象。

示例

COleMessageFilter* pFilter = AfxOleGetMessageFilter();
ASSERT_VALID(pFilter);
pFilter->BeginBusyState();
// do things requiring a busy state
pFilter->EndBusyState();

// Another example 
//CWinApp-derived class
BOOL CCMFCAutomationApp::InitInstance()
{
    CWinApp::InitInstance();

    // Initialize OLE libraries 
    if (!AfxOleInit())
    {
        AfxMessageBox(IDP_OLE_INIT_FAILED);
        return FALSE;
    }

   CWinThread* pThread = AfxGetThread();
   if (pThread != NULL)
   {
      // Destroy message filter, thereby unregistering it. 
      delete pThread->m_pMessageFilter;
      pThread->m_pMessageFilter = NULL;

      // Create the new message filter object. 
      //CMyMessageFilter is derived from COleMessageFilter
      pThread->m_pMessageFilter = new CMyMessageFilter;
      ASSERT(AfxOleGetMessageFilter() != NULL);

      // Register the new message filter object.
      AfxOleGetMessageFilter()->Register();
   }
   //... 
   //... 
   //...

要求

标头:: <afxwin.h>

请参见

参考

COleMessageFilter 类

AfxGetApp

概念

MFC 宏和全局函数