Is it possible to use Win32 Hooks in Qt applications

Question

I like to know if its possible to use win32 keyboard hook function (SetWindowsHookEx , SetWindowsHookEx ) in a Qt application.

If possible pls provide a sample code on

Answer 1

I believe it is possible, yes. Use QWidget::winId.

Answer 2

I was wondering the same thing and found this finally.. Credit goes to Voidrealms.

The video explains enough to make a working application with the following code below.

//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 3

You don't need to do anything with Qt. Just follow the windows examples:

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