QT自定义消息

1.派生QAbstractNativeEventFilter，重写nativeEventFilter()函数

#ifndef CMYMESSAGEHANDLER_H
#define CMYMESSAGEHANDLER_H

#include <QAbstractNativeEventFilter>

#define WM_SEND_MY_MESSAGE WM_USER+1000

class 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 <windows.h>
#pragma comment(lib, "user32.lib")

bool CMyMessageHandler::nativeEventFilter( const QByteArray &eventType, void *message, long *result )
{
	MSG* pMsg = reinterpret_cast<MSG*>(message);

	if(pMsg->message == WM_SEND_MY_MESSAGE)
	{
		// ....处理
		
		return true;
	}
	return false;
}

2.main函数添加类对象

#include <QtWidgets/QApplication>
#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();
}