How can modify opacity of QT dialog using win32 api？

[Javalitterboy]

I obtained the window handle through the window title.
After changing the transparency, the window only flickered briefly and its position changed.
The target window is implemented using the QT5 framework.

handle = FindWindow(NULL, title);
style_ex = GetWindowLong(handle , -20);
SetWindowLong(handle , -20 , style_ex | 0x00080000);
SetLayeredWindowAttributes(handle, 0, 100, 2);

[ChrisW67]

Why not use the Qt facilities to do this? What is the problem you are trying to solve?

[Javalitterboy]

@ChrisW67 I am doing secondary development in Sketchup software, and I need to modify the window style to enrich the convenience and interactivity of the tool.