Knowledge Base Nr: 00108 messagefilter.cpp - http://www.swe-kaiser.de

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OLE: Messagebox 'Server Busy' vermeiden

  
//Die Message erscheint meistens wenn eine Funktion zu lange dauert!
//(z.B.: Das Lesen/Schreiben eines Wertes im OPC-Server.)
//Ansonsten gibt es noch andere OLE Besonderheiten.

#include <afxole.h>

class CMyMessageFilter : public COleMessageFilter
{
    virtual BOOL OnMessagePending(const MSG* pMsg);
};

BOOL CMyMessageFilter::OnMessagePending(const MSG* pMsg)
{
    //The base class function dispatches WM_PAINT
    //by returning FALSE no messages are being processed; the
    //user can add code here to appropriately handle messages.
    //WARNING: Not processing WM_PAINT messages will cause the user
    //         interface to appear to hang and not update until the
    //         current COM method call returns.
    return FALSE;
}

BOOL CShellApp::InitInstance()
{
...
      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.
          pThread->m_pMessageFilter = new CMyMessageFilter;
          ASSERT(AfxOleGetMessageFilter() != NULL);

          pThread->m_pMessageFilter->EnableBusyDialog (FALSE);
          pThread->m_pMessageFilter->EnableNotRespondingDialog (FALSE);

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