const UINT CWndExcel::WM_GETNAVINFO = (0xC111); //::RegisterWindowMessage(_T("WM_GETNAVINFO"));
I have one dialog app(MFC based but question is Windows Q);
I also have a dll that loads to excel and subclass excel. I want to send message from
excel_subclassed window to dialog window.
if I use above a value WM_USER + x
I get the message.
if I use WM_APP + x < 0xc000
but if I use RegisterWindowMessage
to get my message no
for example the one I get is 49597
between 0xc000 and 0xffff
I dont receive the message.
both windows has exactly the same message no, but no response ????
this is windows 2000, I also randomly
selected (semi random) 0xc111,
that did not work. it seems if message no >= 0xc000 it fails ??
what to do ???