是否可以在Qt应用程序中使用Win32 Hooks

时间:2010-01-30 12:36:26

标签: c++ qt winapi qt4 keyboard-hook

我想知道是否可以在Qt应用程序中使用win32键盘钩子函数(SetWindowsHookEx,SetWindowsHookEx)。

如果可能,请在Qt中使用SetWindowsHookEx,SetWindowsHookEx函数提供示例代码。

//截至2010年2月18日更新//

我还没想出如何在QT中做到这一点。

但作为一种解决方法,我使用vc ++ express edition创建了一个win32 dll,并将我的钩子命令放在dll函数中。 我使用QLibrary类

来调用Qt中的dll函数
 /* hearder file code*/
    QLibrary *myLib;
    typedef HHOOK (*MyPrototype)(HINSTANCE);

/* source file code */
    myLib = new QLibrary( "ekhook.dll" );
    MyPrototype myFunction;
    myFunction = (MyPrototype) myLib->resolve( "Init" );

init()是被称为ekhook.dll的函数

3 个答案:

答案 0 :(得分:5)

我想知道同样的事情并最终发现了这一点。感谢Voidrealms

该视频解释了使用以下代码制作有效的应用程序。

//Copied Code from YouTube Video

#include <QtCore/QCoreApplication>
#include <QDebug>
#include <QTime>
#include <QChar>
#include <iostream>
#include <windows.h>
#pragma comment(lib, "user32.lib")

HHOOK hHook = NULL;

using namespace std;

void UpdateKeyState(BYTE *keystate, int keycode) 
{
    keystate[keycode] = GetKeyState(keycode); 
}

LRESULT CALLBACK MyLowLevelKeyBoardProc(int nCode, WPARAM wParam, LPARAM lParam) 
{
    //WPARAM is WM_KEYDOWn, WM_KEYUP, WM_SYSKEYDOWN, or WM_SYSKEYUP
    //LPARAM is the key information

    qDebug() << "Key Pressed!";

    if (wParam == WM_KEYDOWN)
    {
        //Get the key information
        KBDLLHOOKSTRUCT cKey = *((KBDLLHOOKSTRUCT*)lParam);

        wchar_t buffer[5];

        //get the keyboard state
        BYTE keyboard_state[256];
        GetKeyboardState(keyboard_state);
        UpdateKeyState(keyboard_state, VK_SHIFT);
        UpdateKeyState(keyboard_state, VK_CAPITAL);
        UpdateKeyState(keyboard_state, VK_CONTROL);
        UpdateKeyState(keyboard_state, VK_MENU);

        //Get keyboard layout
        HKL keyboard_layout = GetKeyboardLayout(0);

        //Get the name
        char lpszName[0X100] = {0};

        DWORD dwMsg = 1;
        dwMsg += cKey.scanCode << 16;
        dwMsg += cKey.flags << 24;

        int i = GetKeyNameText(dwMsg, (LPTSTR)lpszName, 255);

        //Try to convert the key information
        int result = ToUnicodeEx(cKey.vkCode, cKey.scanCode, keyboard_state, buffer, 4, 0, keyboard_layout);
        buffer[4] = L'\0';

        //Print the output
        qDebug() << "Key: " << cKey.vkCode << " " << QString::fromUtf16((ushort*)buffer) << " " << QString::fromUtf16((ushort*)lpszName);

    }

    return CallNextHookEx(hHook, nCode, wParam, lParam); 
}

int main(int argc, char *argv[]) 
{
    QCoreApplication a(argc, argv);


    hHook = SetWindowsHookEx(WH_KEYBOARD_LL, MyLowLevelKeyBoardProc, NULL, 0);
    if (hHook == NULL)
    {
        qDebug() << "Hook Failed" << endl;
    }

    return a.exec(); 
}

答案 1 :(得分:3)

你不需要对Qt做任何事情。只需按照窗口示例:

http://msdn.microsoft.com/en-us/library/ms644960(VS.85).aspx

答案 2 :(得分:1)

我相信这是可能的,是的。使用QWidget::winId