使用Pywinauto访问桌面窗口属性时遭遇MatchError问题求助

Hey there! Let’s break down why you’re hitting that MatchError and walk through how to fix it step by step.

First, let’s clear up the core mistake here: when you tried to use the class_name like Desktop().Your_Class_Name, you were relying on pywinauto’s BestMatch feature—and that’s not how class names work with that syntax. The Desktop().Common_Files_Properties style is for matching window titles (converted to a snake_case friendly name), not class names. Pywinauto was trying to find a window with a title that matched your class name, which doesn’t exist, hence the MatchError.

Then there’s the other big factor: your target window has is_visible: False. By default, pywinauto only searches for visible windows. So even if you used the right class name syntax, it would have filtered out your invisible window automatically.

Here’s exactly what you need to do to fix this:

1. Use the correct syntax to search by class name #

Forget the dot notation for class names—use the window() method to explicitly define your search criteria. Make sure to add visible_only=False to include invisible windows:

# Pick the right backend (uia works better for modern/invisible windows; win32 for classic Win32 controls)
desktop = Desktop(backend="uia")
# Replace "Your_Exact_Class_Name" with the class name you got from w.get_properties()
target_window = desktop.window(class_name="Your_Exact_Class_Name", visible_only=False)

2. Verify the window exists before interacting #

Before trying to access properties, check if the window was actually found to avoid surprises:

if target_window.exists(timeout=5):
    # Now you can access its properties or control identifiers
    print(target_window.get_properties())
    target_window.print_control_identifiers()
else:
    print("Target window not found—double-check your class name!")

3. Narrow down results if multiple windows share the same class name #

If there are other windows with the same class name, add more filters from the properties you saw (like process_id from w.get_properties()):

target_window = desktop.window(
    class_name="Your_Exact_Class_Name",
    process_id=1234,  # Replace with your window's actual process ID
    visible_only=False
)

4. Avoid BestMatch dot notation for invisible/ambiguous windows #

The Desktop().Common_Files_Properties approach relies on pywinauto guessing a friendly name from the window title. This works great for visible, clearly titled windows, but fails hard for invisible ones or those with generic/empty titles. Stick to explicit window() searches for these cases.

Why your original attempts failed: #

• You tried using a class name with BestMatch’s dot syntax (which is for title matching, not class names)
• Pywinauto’s default search filters out invisible windows, so your target was being excluded even with the right class name

Give these steps a shot—this should resolve the MatchError and let you access that window’s properties properly.

备注：内容来源于stack exchange，提问作者noel