Message WndProc = 49619 -What is it?

Question

I am debugging a drag and drop error in wpf and subscribed to wndproc. I get message id 49619 with wparam = 0 and lparam = 0. I have exhausted my Google efforts and could not find out what the name of this window is.

If you know, great. If you can provide a website that includes it in your list of window messages, this is even better.

hex value = 0xC1D3

Answer 1

Take a look at WM_USER. http://msdn.microsoft.com/en-us/library/windows/desktop/ms644931(v=vs.85).aspx

RegisterWindowMessage

The message numbers in the fourth range (from 0xC000 to 0xFFFF) are determined at run time when the application calls the RegisterWindowMessage function to obtain the message number for the line. All applications that register the same line can use the associated message number for messaging. The actual message number, however, is not constant and cannot be considered the same between different sessions.