Get text from popup window

You will only be able to read this text programmatically if it is contained in a windowed control. You can easily check this with Spy++. Many GUI frameworks don't use windowed controls for their child controls, or only use windowed controls for some children.

If it is a windowed control then you can identify it by calling GetWindow() and walking the child structure (obviously you need to use the win32gui equivalent).

I don't have access to the framework or the error dialog you are using, so I can only say in general what you want.

You need the FindWindowEx function, and use it to find a control whose class name is 'static' (or whatever the class name of the control is). I imagine this would be the line:

control = win32gui.FindWindowEx(window, 0, "Static", 0)

That returns the handle to the control, and you can then use GetWindowText on that to get the text.