OpenCV window in Ultra App Kit viewport

[Jaimie Vos]

I saw the OpenGL example with the Ultra App Kit. Currently I have my OpenCV window instead of OpenGL and I am trying to get this into my Ultra Game Kit window. How can I go about this and get this done?

[Josh]

So you created the window with OpenCV? Can OpenCV create a window or context from an existing HWND?

[Josh]

It might also be possible for me to add a window creation command like this:

shared_ptr<Window> CreateWindow(HWND handle)

But in that case you would be responsible for feeding all events into the user interface.

[Jaimie Vos]

14 hours ago, Josh said:

So you created the window with OpenCV? Can OpenCV create a window or context from an existing HWND?

OpenCV has a method to receive the HWND. But I don't really get how I can change this with the opengl example.

[Josh]

Window::GetHandle() will return the HWND:
https://www.ultraengine.com/learn/CPP/Window_GetHandle

So start with that?

[Jaimie Vos]

2 hours ago, Josh said:

Window::GetHandle() will return the HWND:
https://www.ultraengine.com/learn/CPP/Window_GetHandle

So start with that?

I think I didn't explain well enough what I mean.

I want to have my opencv window inside my ultra app kit window. Not my ultra app kit window inside of my opencv window.

[Josh]

Maybe this will do it:
https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setparent

Then use ListenEvent to run a callback when a window resize event occurs, and use that to adjust the size of your child window whenever the parent resizes.

You will want to use the WS_CHILD style flag when your child window is created in OpenCV, or set it after.