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Asked: 2026-06-03T18:52:26+00:00

My problem is that I have code I cannot modify that reacts to ON_UPDATE_COMMAND_UI,

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My problem is that I have code I cannot modify that reacts to ON_UPDATE_COMMAND_UI, and I’ve hosted the code in WinForms, so it’s not routing the messages correctly.

I’ve hooked into the Idle override in my winform host, but I don’t know how to mimic the message.

If I wanted to mimic ON_UPDATE_COMMAND_UI by sending a message directly to a target, how would I arrange WPARAM and LPARAM.

I’ve looked at the guts of MFC, and it appears that it doesn’t send a message at all really, it goes straight from routing commands through methods in CmdTarget to manually searching through a target’s message map.

So, since I have no examples of pushing a real message, I don’t know how to do it.

Alternate solutions equally accepted!

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1 Answer

  1. Editorial Team

    I’ve looked at the guts of MFC, and it appears that it doesn’t send a message

    That statement is incorrect. Al routing starts with the WM_IDLEUPDATECMDUI message sent to the main window and all descendants when application enters idle state.

    It is also sent when menu pops up to update menu items.
    I do not think that implementing it in .NET world will be easy.

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