RPA.Windows: Not possible to close a window after a popup of it has been closed

[kkotenko]

A Win32 Framework application may open a modal window (ControlType Window, ClassName #32770). At least in the example I am facing, it has the same ProcessId as the main application.

Therefore, closing a popup that has been Control windowed is not possible using Close Current Window - Close Current Window just kills the whole process via SIGTERM (in this case, including the main application, because they share ProcessId). The popup has to be closed by other means (e.g. by sending an ESC keystroke).

However, that means self.window still points to the now closed popup. It is a WindowsElement object, whose item has a ProcessId of 0.

When you try to call Close current window later, you are therefore sending a SIGTERM to PID 0 (which is the idle process), which throws an OSError: [WinError 87] The parameter is incorrect.

The solution, obviously, is to re-take control of the main application after the popup has been closed. However, I wonder whether this deserves more documentation somewhere, or adding error messages to catch the case of attempting to close PID 0.

rpaframework/packages/windows/src/RPA/Windows/keywords/window.py

Lines 328 to 345 in 3853cf7

	window = self.window
	if window is None:
	self.logger.warning("There is no active window!")
	self.ctx.window_element = None
	return False
	pid = window.item.ProcessId
	self.logger.info("Closing window with name: %s (PID: %d)", window.name, pid)
	os.kill(pid, signal.SIGTERM)
	self.ctx.window_element = None
	anchor = self.ctx.anchor_element
	if anchor and window.is_sibling(anchor):
	# We just closed the anchor as well (along with its relatives), so clear
	# it out properly.
	self.ctx.clear_anchor()
	return True