Neither GUI element (wrapper) nor wrapper method 'print_control_identifiers' were found (typo?) error is returned for Application and DialogWrapper classes. WindowSpecification class returns None.
I was expecting the WindowSpecification to return at least something. Because a few milliseconds later I am able to interact with it. For example I successfully iterate like this: for child in self.main_window_specification.Children():
Code:
def run(self, output_mod_name):
""" Runs the ArtManager executable """
logger.info("Starting art manager")
self.app = Application(backend="win32").start(self.path)
logger.debug(f"Type of self.app: {type(self.app)}")
try:
logger.debug("This is expected to fail")
logger.debug(f"{self.app.print_control_identifiers()}")
except Exception as exc:
traceback_formatted = traceback.format_exc()
logger.debug(traceback_formatted)
logger.debug("Launched art manager process")
# wait for the window to come up
expected_window_title = f"S: {output_mod_name} | A: {output_mod_name} | Art Manager"
self.main_window_dialog = self.app.window(best_match=expected_window_title).wait('ready', timeout=10)
logger.debug(f"Type of self.main_window_dialog: {type(self.main_window_dialog)}")
try:
logger.debug("This is expected to fail too")
logger.debug(f"{self.main_window_dialog.print_control_identifiers()}")
except Exception as exc:
traceback_formatted = traceback.format_exc()
logger.debug(traceback_formatted)
logger.info("Art manager started")
self.main_window_specification = self.app.window(best_match=expected_window_title)
logger.debug(f"Type of self.main_window_specification: {type(self.main_window_specification)}")
try:
logger.debug("This is expected to work")
logger.debug(f"{self.main_window_specification.print_control_identifiers()}")
except Exception as exc:
traceback_formatted = traceback.format_exc()
logger.debug(traceback_formatted)
logger.debug("Aquired handle on Art Manager window")
Output:
2023-10-09 12:21:24,756 - (art_manager.py:76) - tqma - INFO - Starting art manager
2023-10-09 12:21:26,007 - (art_manager.py:78) - tqma - DEBUG - Type of self.app: <class 'pywinauto.application.Application'>
2023-10-09 12:21:26,008 - (art_manager.py:80) - tqma - DEBUG - This is expected to fail
2023-10-09 12:21:26,008 - (art_manager.py:84) - tqma - DEBUG - Traceback (most recent call last):
File "src\binary_automation\art_manager.py", line 81, in run
logger.debug(f"{self.app.print_control_identifiers()}")
File "pywinauto\application.py", line 180, in __call__
AttributeError: Neither GUI element (wrapper) nor wrapper method 'print_control_identifiers' were found (typo?)
2023-10-09 12:21:26,008 - (art_manager.py:85) - tqma - DEBUG - Launched art manager process
2023-10-09 12:21:26,021 - (art_manager.py:90) - tqma - DEBUG - Type of self.main_window_dialog: <class 'pywinauto.controls.hwndwrapper.DialogWrapper'>
2023-10-09 12:21:26,021 - (art_manager.py:92) - tqma - DEBUG - This is expected to fail too
2023-10-09 12:21:26,021 - (art_manager.py:96) - tqma - DEBUG - Traceback (most recent call last):
File "src\binary_automation\art_manager.py", line 93, in run
logger.debug(f"{self.main_window_dialog.print_control_identifiers()}")
AttributeError: 'DialogWrapper' object has no attribute 'print_control_identifiers'
2023-10-09 12:21:26,021 - (art_manager.py:98) - tqma - INFO - Art manager started
2023-10-09 12:21:26,022 - (art_manager.py:100) - tqma - DEBUG - Type of self.main_window_specification: <class 'pywinauto.application.WindowSpecification'>
2023-10-09 12:21:26,022 - (art_manager.py:102) - tqma - DEBUG - This is expected to work
2023-10-09 12:21:26,101 - (art_manager.py:103) - tqma - DEBUG - None
2023-10-09 12:21:26,101 - (art_manager.py:107) - tqma - DEBUG - Aquired handle on Art Manager window
Because app object doesn't have method dump_tree() or its alias print_control_identifiers(). It is a method of WindowSpecification object only. In future releases it will be added to a wrapper object as well. No plans for Application object though.
But for Application and Desktop objects there is method windows() to return a list of top level windows as wrappers. Their properties/methods can be used to create proper WindowSpecification.
EDIT:
By default method dump_tree() prints to stdout / console. It can be redirected to a file by the method parameter filename. Yes, the method returns None. This is by design from the very beginning.