TreeView and WndProc

[PoovenM]

Greetings :)

I'm trying to intercept some Win32 messages; in particular I want to respond to a TVN_GETDISPINFO notification. This notification is sent in the form of a WM_NOTIFY (see here) and contains a pointer to NMTVDISPINFO which gives access to a TVITEM . TVITEM has a LPTSTR pszText field that I want to modify.

Here's what I don't understand: If the TVN_GETDISPINFO notification is sent as a WM_NOTIFY message, how to I distinguish it from any other WM_NOTIFY message?

protected override void WndProc(ref Message m)
{
  if (m.Msg == 0x004E) //WM_NOTIFY taken from WinUser.h
  {
    //How do I know if the message is a TVN_GETDISPINFO notification?
  }
  base.WndProc(ref m);
}

Thank you for reading my post. Any tips, hints or suggestions are welcomed :)