I am filtering keyboard messages delivered to a specific win32 application by hooking GetMessage/PeekMessage, it works fine except for context menu. For example, when i right click blank area in notepad and press P to paste text from clipboard, i am not seeing GetMessaage(WM_KEYDOWN...) invoked at all. Is there any other apis that are used to get keyboard messages from message queue for context menu? BTW, for specific reason, i cannot use WH_KEYBOARD_LL for this purpose.
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Menu keys are delivered by WM_MENUCHAR. – Raymond Chen Aug 15 '20 at 02:47
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Unfortunately i am not seeing a WM_MENUCHAR(0x0120) message retrieved in GetMessage/PeekMessage – herb Aug 15 '20 at 11:03
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the interesting thing is WH_GETMESSAGE hook can intercept these WM_KEYDOWN/UP messages – herb Aug 15 '20 at 13:59
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`WM_MENUCHAR` is a sent message, and `WH_GETMESSAGE` hooks do not see sent messages. – Raymond Chen Aug 15 '20 at 14:18
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WH_GETMESSAGE only sees posted messages. Use WH_CALLWNDPROC to hook sent messages. – Remy Lebeau Aug 15 '20 at 23:28
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guys, you are not answering my question, my question is why WM_KEYDOWN/UP is not monitored in GetMessage/PeekMessage hook, I am using Detours hook, not WH_XXX – herb Aug 16 '20 at 00:27
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This is by design.
I can reproduce this problem on Notepad/Edit control. After discussing with related engineer, it is certain that the menu that appears after pressing the right mouse button and press P can receive WM_KEYDOWN, but the WM_KEYDOWN message is handled inside the menu and it is converted to other messages. This is why we cannot monitor in GetMessage. We don't know the message processing mechanism inside the system menu, but if you are interested, you can draw a menu and test it yourself.
Strive Sun
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@herb Hi, if the answer is useful to you, don't forget to mark it. This can be beneficial to other community members reading this thread. [How to accept an answer?](https://meta.stackexchange.com/questions/5234/how-does-accepting-an-answer-work/5235#5235) – Strive Sun Aug 28 '20 at 08:03