Get HWND on windows with Qt5 (from WId)

Question

I am trying to convert a Qt4 Application to Qt5. The only thing I couldn\'t figure out is how to get the HWND of a Widget. The program uses EcWin7 to show the progr

Answer 1

winId() worked for me on Qt 5.1 at least it has the same value when I'm using

bool Widget::nativeEvent(const QByteArray & eventType, void * message, long * result)
{
    MSG* msg = reinterpret_cast<MSG*>(message);
    qDebug() << msg->hwnd;

    return false;
}

and

qDebug() << winId();

Answer 2

#include <QtGui/5.0.0/QtGui/qpa/qplatformnativeinterface.h>

static QWindow* windowForWidget(const QWidget* widget) 
{
    QWindow* window = widget->windowHandle();
    if (window)
        return window;
    const QWidget* nativeParent = widget->nativeParentWidget();
    if (nativeParent) 
        return nativeParent->windowHandle();
    return 0; 
}

HWND getHWNDForWidget(const QWidget* widget)
{
    QWindow* window = ::windowForWidget(widget);
    if (window && window->handle())
    {
        QPlatformNativeInterface* interface = QGuiApplication::platformNativeInterface();
        return static_cast<HWND>(interface->nativeResourceForWindow(QByteArrayLiteral("handle"), window));
    }
    return 0; 
}

Answer 3

You may try:

(HWND)QWidget::winId();

Answer 4

Try this function: QWindowsNativeInterface::nativeResourceForWindow

Answer 5

In Qt5 winEvent was replaced by nativeEvent:

bool winEvent(MSG* pMsg, long* result)

is now

bool nativeEvent(const QByteArray & eventType, void * message, long *result)

And in EcWin7::winEvent you have to cast void to MSG:

bool EcWin7::winEvent(void * message, long * result)
{
    MSG* msg = reinterpret_cast<MSG*>(message);
    if (msg->message == mTaskbarMessageId)
    {
      ...

I was able to get the application to work! Just replace:

 mWindowId = wid;

with

 mWindowId = (HWND)wid;