1.派生QAbstractNativeEventFilter，重写nativeEventFilter()函数

#ifndef CMYMESSAGEHANDLER_H#define CMYMESSAGEHANDLER_H#include 
    
     #define WM_SEND_MY_MESSAGE WM_USER+1000class CMyMessageHandler : public QAbstractNativeEventFilter{	//Q_OBJECT //这个不需要...public:	virtual bool nativeEventFilter(const QByteArray &eventType, void *message, long *result) Q_DECL_OVERRIDE;//Signals: //	void SigTest()         //新增加信号SigTest()。};#endif // CMYMESSAGEHANDLER_H
    

#include "CMyMessageHandler.h"#include 
    
     #pragma comment(lib, "user32.lib")bool CMyMessageHandler::nativeEventFilter( const QByteArray &eventType, void *message, long *result ){	MSG* pMsg = reinterpret_cast
     
      (message);	if(pMsg->message == WM_SEND_MY_MESSAGE)	{		// ....处理				return true;	}	return false;}
     
    

2.main函数添加类对象

#include 
    
     #include "CMyMessageHandler.h"int main(int argc, char *argv[]){	QApplication a(argc, argv);	ChateRoom w;	w.show();//------------------main函数添加----------------	CMyMessageHandler myMsgHanler;	a.installNativeEventFilter(&myMsgHanler); //----------------------------------------------	return a.exec();}