[SOLVED] Show HWND from a win32 application in a QMdiSubwindow

Stefan

Hello everyone,

my job is to replace the GUI of a win32 application by Qt. The application is quite complex and we want a step by step integration of the graphical elements. Is it possible to show a HWND from an existing win32 application in a QMdiSubwindow?

I have found the QWinHost Documentation, but I am not sure if this is the right approach. Does anyone have experience with it?

Thanks in advance.

Stefan

Rondog

That link is old (Qt 3.x). This class might not exist in current versions of Qt.

I assume you want to minimize changes to the parts of the program that use SendMessage() as much as possible. I believe you can get the HWND value for all widgets (winId() ?) although I have not tried this. You will need to setup a callback function as well to monitor for messages.

I would avoid this if I were you. Hopefully your application separated the GUI from the program which will help when porting (usually is not the case). The signal/slot from Qt would be the replacement for SendMessage() for user defined messages.

JKSH

Hi @Stefan, and welcome to the Qt Dev Net!

That functionality is not officially supported in Qt 5. It's kind of possible, but it's buggy.

See here for an example: https://forum.qt.io/topic/43708/can-t-receive-key-and-mouse-wheel-events-after-qwidget-createwindowcontainer

Stefan

Thank you for your advice, i guess we have to refactor parts of the code to meet our goal.