qt 获取windows 的消息（qt get message from win32 API ）

qt 给win32 发送消息很简单，但是要获取windows 消息却十分复杂，最后想了一个不是很完美 但是也是以现在本人能力所能实现的唯一途径了，基本原理是 利用vc编写一个mfc 的dll，这个dll 中创建一个透明窗体，利用这个dll 获取win32 API 消息。

源码 已经在vs2010 vs6.0 qt 4.7 下试验通过

下面贴出 重要的实现源码：

VC dll- ReceiveMessage.cpp

#include "stdafx.h"

#include "resource.h"

typedef int (*CALLBACKFUNC)(DWORD Type, DWORD position);

CALLBACKFUNC pfnCallback_tmp;

HINSTANCE hInstance;

unsigned longWM_UNITOKEN_NOTIFY = RegisterWindowMessage("notify_HuFeng");

BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved)

{
switch(ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
hInstance = (HINSTANCE)hModule;
break;
}
return TRUE;
}

HWND m_hWnd = 0;
unsigned long nStep = 0;
unsigned long TotalStep = 0;

//INT_PTR __stdcall

BOOL CALLBACK DialogProcedure(HWND hWnd, UINT Message, WPARAM wParam, LPARAM lParam)

{

switch(Message)

case WM_CREATE:{
break;};
case WM_COMMAND:
{
SendMessage(hWnd, WM_DESTROY, 0, 0);
break;
};
case WM_DESTROY:{PostQuitMessage(0);break;};
case WM_INITDIALOG : { break;};
default :{
if(Message==WM_UNITOKEN_NOTIFY)
{pfnCallback_tmp(wParam,lParam);};break;}
}

return 0;

}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

if (message==WM_DESTROY)
{
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;

}

DWORD __stdcall ThreadFuction(LPVOID pParam)

{

MSG Msg;

HWND hWnd_HuFeng= CreateDialog(hInstance, MAKEINTRESOURCE(IDD_DIALOGH), NULL, DialogProcedure);

int erro = GetLastError();

ShowWindow(hWnd_HuFeng, SW_HIDE);

while(GetMessage(&Msg, NULL, 0, 0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return 0;

}

extern "C" void __stdcall ReceiveMessageFun(CALLBACKFUNC pfnCallback)

{

DWORDThreadID;

HANDLE m_hThread;

pfnCallback_tmp = pfnCallback;
m_hThread=CreateThread(NULL, 0, ThreadFuction, NULL, 0, &ThreadID);
CloseHandle(m_hThread);

}

QT 接收部分

头文件.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "windows.h"
#include "qthread.h"
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow {
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
~MainWindow();

protected:
void changeEvent(QEvent *e);

private:
Ui::MainWindow *ui;
};

class MyThread : public QThread
{
public:
void run();
void foo();
};

#endif // MAINWINDOW_H

QT 接收部分

receive.cpp

#include <QtGui/QApplication>
#include "mainwindow.h"

#include <QtCore/qobject.h>

#include <limits.h>
#include "QLibrary"
typedef int (* CALLBACKFUNC)(unsigned long Type, unsigned long position);
//extern "C" void __stdcall ReceiveMessageFun(CALLBACKFUNC pfnCallback);
CALLBACKFUNC pfnCallback;

int outputMsg(unsigned long Type, unsigned long position)
{
qDebug("Received Message");
return 0;
}

int main(int argc, char *argv[])
{
int m;
QApplication a(argc, argv);
//MainWindow w;
// outputMsg(12,34);
MyThread aa;
// aa.start();
aa.run();
// w.show();
return a.exec();
}

void MyThread::run()
{
QLibrary myLib("../ReceiveMessage");
if(myLib.load())
{
qDebug("link lib success");}

else
{
qDebug("link lib failed");
}
pfnCallback = outputMsg;
typedef void(*ReceiveMessageFun_HF)(CALLBACKFUNC pfnCallback);//库版本
ReceiveMessageFun_HF pGetLibraryVerion =(ReceiveMessageFun_HF)myLib.resolve("ReceiveMessageFun");
pGetLibraryVerion(pfnCallback);
// sleep(1);
}

QT 发送部分 头文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "windows.h"
#include "stdlib.h"
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow {
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
~MainWindow();

protected:
void changeEvent(QEvent *e);
void _SendNotify(DWORD fuccode,DWORD retcode);
private:
Ui::MainWindow *ui;
DWORD a,b;
private slots:
void on_pushButton_clicked();
};

#endif // MAINWINDOW_H

QT 发送部分

receive.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "QFileDialog"
#include "QDebug"
#include "QTextCodec"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}

MainWindow::~MainWindow()
{
delete ui;
}

void MainWindow::changeEvent(QEvent *e)
{
QMainWindow::changeEvent(e);
switch (e->type()) {
case QEvent::LanguageChange:
ui->retranslateUi(this);
break;
default:
break;
}
}

void MainWindow::on_pushButton_clicked()
{
a=200;
b=50;
MainWindow::_SendNotify(a, b);
}

void MainWindow::_SendNotify(DWORD fuccode, DWORD retcode)
{
unsigned long WM_UNITOKEN_NOTIFY=::RegisterWindowMessageW(L"notify_HuFeng");
PostMessageW(HWND_BROADCAST, WM_UNITOKEN_NOTIFY, fuccode, retcode);
}

代码不尽完善 只是提供一个思路