QT源码解析之Qt处理Windows消息

QT中如何处理Windows消息是本文要介绍的内容，先来看代码实现。

bool QApplication::winEventFilter ( MSG * )  

消息程序在每次接受到消息时调用这个函数。如果你想处理Qt不处理的窗口消息msg，请重新实现这个函数。 

bool MainWindow::winEvent(MSG* pMsg)  
{  
 if ( pMsg->message == WM_COPYDATA )  
 {  
  COPYDATASTRUCT* pCopyDataStruct;  
  POSTERS_REC_STRUCT* pRec;  
  unsigned char* odapMsgPtr[MAX_POSTERS_SIZE];  
  QString str;  
  pCopyDataStruct = (COPYDATASTRUCT*) pMsg->lParam;  
  switch (pCopyDataStruct->dwData)  
  {  
  case VALID_REC1 :  
  case VALID_REC2 :  
   {  
    (void)memcpy(odapMsgPtr, pCopyDataStruct->lpData, pCopyDataStruct->cbData);  
    if (odapMsgPtr != NULL)  
    {  
     pRec = (POSTERS_REC_STRUCT *)odapMsgPtr;  
     class_data1 = pRec->var1;  
     class_data2 = pRec->var2;  
    }  
   }  
  }  
  return true;  
 }  
 else  
  return false;  
}  
Some Code on the web gives another example  
#ifdef HAVE_WIN32_API  
  virtual bool winEventFilter(MSG * msg) {  
    SPW_InputEvent sbEvent;  
    if (SPW_TranslateEventWin32(msg, &sbEvent)) {  
      QWidget * focus = this->focusWidget();  
      if (!focus) focus = this->activeWindow();  
      if (focus) {  
        QCustomEvent qevent((QEvent::Type)SoQtInternal::SPACEBALL_EVENT,  
                            (void *)&sbEvent);  
        QApplication::sendEvent(focus, &qevent);  
      }  
    }  
#if (QT_VERSION >= 0x040000)  
    long result = 0;  
    return QApplication::winEventFilter(msg, &result);  
#else  
    return QApplication::winEventFilter(msg);  
#endif 

The QSystemTrayIcon class provides an icon for an application in the system tray.
Modern operating systems usually provide a special area on the desktop, called the system tray or notification area, where long-running applications can display icons and short messages.

/* translates a Win32 event to a SPW_InputEvent. */  
int SPW_TranslateEventWin32(MSG * msg, SPW_InputEvent * sbEvent)  
{  
  SiSpwEvent spwEvent;  
  SiGetEventData eventdata;  
  if (Spw_DeviceHandle != SI_NO_HANDLE) {  
    SiGetEventWinInit (&eventdata, msg->message, msg->wParam, msg->lParam);  
    if (SiGetEvent (Spw_DeviceHandle, 0, &eventdata, &spwEvent) == SI_IS_EVENT) {  
      int i;  
      switch(spwEvent.type) {  
        case SI_MOTION_EVENT:  
          sbEvent->type = SPW_InputMotionEvent;        
          for(i=0; i<6; i++) {  
            sbEvent->sData[i] = (short)spwEvent.u.spwData.mData[i];  
          }    
          break;  
        case SI_BUTTON_EVENT:  
          sbEvent->type = SPW_InputButtonPressEvent;  
          sbEvent->buttonState.pressed = (SiButtonPressed(&spwEvent) != SI_NO_BUTTON);  
          sbEvent->buttonState.released = (SiButtonReleased(&spwEvent) != SI_NO_BUTTON);  
          break;  
      }  
      return TRUE;  
    }  
  }  
  return FALSE;  
} 

小结：QT源码解析之Qt处理Windows消息的内容介绍完了，希望本文对你有帮助。