Solved

RichEdit32 and WM_CONTEXTMENU

Posted on 1998-05-20
5
896 Views
Last Modified: 2013-12-03
I am using a richedit control (richedit32.dll) and I want to get the WM_CONTEXTMENU message to the parent window.  Problem is, RE32 eats all the mouse messages.  So, I used the events notify to capture the wm_rbuttonup message, and used SendMessage to send wm_contextmenu (with cursor x,y position) to the parent window.  Here's the problem--> the wm_contextmenu message dissappears!!  It seems so simple, what am I missing??  I do this:

case EN_MSGFILTER:
      {
      UINT uID = (UINT) wParam;
      MSGFILTER *pmf = (MSGFILTER*) lParam;
 
      if (pmf->msg == WM_RBUTTONUP)
            {
            if ((void*)GetWindowLong(hWnd,GWL_WNDPROC) != (void*)TextWndProc)
                  MessageBeep(0); // never gets here!!
            //TextWndProc(hWnd,WM_CONTEXTMENU,0,pmf->lParam); // works!!
            SendMessage(hWnd,WM_CONTEXTMENU,0,pmf->lParam);  // does not!!
            }
      *pResult = 0;
      }            
      
I put a breakpoint on the wm_contextmenu case in the parent window proc, trace thru SendMessage, (which returns) and the breakpoint is never hit.  If I call the window procedure directly (commented out above) it works fine.  Where did my message go????
0
Comment
Question by:tkirby052098
  • 3
5 Comments
 
LVL 23

Expert Comment

by:chensu
ID: 1402952
Try using PostMessage instead of SendMessage.
0
 

Author Comment

by:tkirby052098
ID: 1402953
I tried PostMessage with the same results.
0
 
LVL 2

Accepted Solution

by:
tonp earned 100 total points
ID: 1402954
This is no doubt a multiple thread issue. Under Win32 a SendMessage can return before the message is processed if the Window is created in another thread. Use SendMessageTimeOut if you want the message to be processed before the call returns. However, this may not always be possible.
0
 

Author Comment

by:tkirby052098
ID: 1402955
It's possible that richedit32 sends msgfilter notifications from another thread, so then the SendMessage thread issue might pop up.  However, even though the call returns immediately, the other (main) thread should process the message (eventually), right?  But, it does not happen: the message never gets to the intended window procedure.
The work-around for this problem was to call the wm_contextmenu handler function directly from the msgfilter notification.  If there was a thread problem, it would have definitely caused a failure (running TrackPopupMenu from a sub-thread).  Stumped?
0
 

Author Comment

by:tkirby052098
ID: 1402956
Never did find out why this does not work....
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This tutorial is about how to put some of your C++ program's functionality into a standard DLL, and how to make working with the EXE and the DLL simple and seamless.   We'll be using Microsoft Visual Studio 2008 and we will cut out the noise; that i…
For most people, the WrapPanel seems like a magic when they switch from WinForms to WPF. Most of us will think that the code that is used to write a control like that would be difficult. However, most of the work is done by the WPF engine, and the W…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
Edureka is one of the fastest growing and most effective online learning sites.  We are here to help you succeed.

912 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now