是否可以在Qt应用程序中使用Win32 Hooks

Question

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.

// 2010年2月18日更新//

我还没弄明白如何在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类从Qt调用该函数

 /* 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()是被调用的ekhook.dll中的函数

Answer 1

我想知道同样的事情并最终发现了这一点.归功于Voidrealms.

该视频解释了足以使用以下代码制作一个有效的应用程序.

//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(); 
}

Answer 2

我相信这是可能的，是的。使用QWidget::winId。