QML and Windows API

[Wilha]

How do i go about implementing the Windows API with QML, specifically the sendInput() method where i can call it after a press event is triggered in QML. For example I have the following c++ code that I want to implement on the QML code following it.

I'm new to Qt and QML so bear with my ignorance if this is harder than it may seem.

       #include "Windows.h"
       #include "WinUser.h"
        INPUT key;
        key.type = INPUT_KEYBOARD;
        key.ki.wScan = 0; // hardware scan code for key
        key.ki.time = 0;
        key.ki.dwExtraInfo = 0;
        key.ki.wVk = 0x30; // virtual-key code for the "0" key
        key.ki.dwFlags = 0; // 0 for key press
        SendInput(1, &key, sizeof(INPUT));
        key.ki.wVk = 0x30; // virtual-key code for the "0" key
        key.ki.dwFlags = KEYEVENTF_KEYUP; // KEYEVENTF_KEYUP for key release
        SendInput(1, &key, sizeof(INPUT));

*********************************

Window {

    visible: true
    width: Screen.width/2
    height: Screen.height/2

    Rectangle {
        id: numberZero
        border.width : 2
        border.color : "blue"
        width: parent.width/8
        height: parent.width/8
    }

    Text {
        id: numberZeroText
        anchors.centerIn: numberZero
        text: "0"
    }

    MouseArea {
        id: clickNumberZeroMouseArea
        anchors.fill: numberZero
        width: numberZero.width
        height: numberZero.height
        onPressed: {
            console.log(Qt.Key_0);
        }
    }
}

[raven-worx]

@Wilha
This needs to be done from C++.
So you could create a custom QObject with invokable methods and publish it to QML.

[Wilha]

@raven-worx
Thanks for pointing me in the right direction. I'll give it a go and come back with results later.
Thanks again.

[Wilha]

@raven-worx
I went ahead and did as you specified, the issue is that the Qt application is the layer that is capturing my key events, how do I send the events to Windows OS directly bypassing the Qt app. Therefore, Windows OS captures the events and the input is sent to "notepad" for example.

heres a snippet of the code:

main.qml:

    MouseArea {
        id: clickNumberZeroMouseArea
        anchors.fill: numberZero
        width: numberZero.width
        height: numberZero.height
        onPressed: {
            //console.log(Qt.Key_0);
            keyEvent.typeNow();
        }
    }

keyevent.h:

class KeyEvent : public QObject
{
    Q_OBJECT
public:
    Q_INVOKABLE void typeNow();
};

keyevent.cpp:

void KeyEvent::typeNow(){
    INPUT key;
    key.type = INPUT_KEYBOARD;
    key.ki.wScan = 0; // hardware scan code for key
    key.ki.time = 0;
    key.ki.dwExtraInfo = 0;
    key.ki.wVk = 0x30; // virtual-key code for the "0" key
    key.ki.dwFlags = 0; // 0 for key press
    SendInput(1, &key, sizeof(INPUT));
    key.ki.wVk = 0x30; // virtual-key code for the "0" key
    key.ki.dwFlags = KEYEVENTF_KEYUP; // KEYEVENTF_KEYUP for key release
    SendInput(1, &key, sizeof(INPUT));
}

main.cpp:

    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    qmlRegisterType<KeyEvent>("keyEvent", 1, 0, "keyEvent");
    KeyEvent keyEvent;
    engine.rootContext()->setContextProperty("keyEvent", &keyEvent);
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));