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is there anyone who knows if and where the messages WM_USER+780 (0x070C) and WM_USER+768 (0x0700) are documented?

These messages are dispatched to the webBrowser (mshtml.dll): 0x070C is sent when the readyState of HTML document is READYSTATE_COMPLETE. The message 0x0700 seems to be sent when readyState is READYSTATE_LOADING (that's the value returned by get_ReadyState() at that time).

Finally, both messages don't seem to use wParam and lParam (0).

Niall
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Neil
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  • Best your are going to get is: https://msdn.microsoft.com/en-us/library/windows/desktop/ms644931(v=vs.85).aspx That is they are internal private messages. – Richard Critten Mar 05 '18 at 21:26
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    It is a WM_USER message, you are not supposed to know. What are you going to do differently if you do know? – Hans Passant Mar 05 '18 at 21:42
  • I mean... maybe there's a header with an entry like this: #define WM_CAP_UNICODE_START WM_USER+100. In case I would use the official constant name. Handling this message is much more easier than connecting through IConnectionPoint::Advise(). – Neil Mar 05 '18 at 21:56

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