Why is there no response when clicking on the menu displayed by TrackPopupMenu?

There could be several reasons why clicking on the menu displayed by TrackPopupMenu does not have any response.

1. The message loop is incorrect: after calling TrackPopupMenu, the menu click messages should be handled in the message loop. If the menu messages are not handled correctly, the menu click reactions will not be triggered.
2. The command ID of the menu item was not handled correctly: when processing menu click messages, the corresponding operation should be executed based on the command ID of the menu item. Without correctly handling the command ID, the response to the menu click cannot be triggered.
3. The menu item is not correctly linked to the corresponding message processing function: when creating a menu item, it is necessary to link the menu item to the corresponding message processing function. Failure to properly bind the message processing function will prevent the menu click response.
4. The availability of menu items has not been properly set: the availability of menu items needs to be configured based on the current context before displaying the menu. Without the correct availability settings, the menu click response will not be triggered.
5. The flag of the menu item has not been set correctly: When creating a menu item, it is necessary to set the corresponding flag according to the needs, such as MF_STRING, MF_POPUP, etc. If the flag of the menu item is not set correctly, then the menu click response cannot be triggered.

The reasons listed above may cause the menu items in TrackPopupMenu to not respond when clicked. Carefully examine and eliminate these possibilities to identify and correct the issue.