Solved

Problem with WM_USER message

Posted on 2000-03-09
2
407 Views
Last Modified: 2013-11-20
Hi,

I have a problem with WM_USER message. I have a class CRichListBox, child from CListBox. I overriden method
OnLButtonDown(UINT nFlags, CPoint point) this way:

//RichListBox.h:
#define WM_USER_RICHLISTBOX_LINK      WM_USER+0x1235

//RichListBox.cpp:

void CRichListBox::OnLButtonDown(UINT nFlags, CPoint point) {      
  //do something...
 
  //Send WM_USER message to parent
  GetParent()->SendMessage(WM_USER_RICHLISTBOX_LINK, 0, 0);
}


Dialog class:

//C_MFC_TESTDlg.h:

class C_MFC_TESTDlg : public CDialog
{
//...
  //{{AFX_MSG(C_MFC_TESTDlg)
  //...
  afx_msg void OnLink();
  //}}AFX_MSG
  DECLARE_MESSAGE_MAP()
//...
};


//C_MFC_TESTDlg.cpp:
//...
BEGIN_MESSAGE_MAP(C_MFC_TESTDlg, CDialog)
  //{{AFX_MSG_MAP(C_MFC_TESTDlg)
  //...
  ON_MESSAGE(WM_USER_RICHLISTBOX_LINK, OnLink)
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()

//...

void C_MFC_TESTDlg::OnLink() {
  //...
}

This construction works fine in Debug version (Debug configuration). But in Release vesion I get "This program has performad an illegal operation..." e.g. program crashed.

Someone can tell me why this happens? May be I need to delete message after processing?

regards,
 mahno
0
Comment
Question by:mahno
2 Comments
 
LVL 8

Accepted Solution

by:
VinExpert earned 50 total points
ID: 2600118
Hi,

Change Ur function declaration to

afx_msg void OnLink(WPARAM wParam, LPARAM lParam);

And function as
void C_MFC_TESTDlg::OnLink(WPARAM wParam, LPARAM lParam)
{
            //...
}

Hope this helps.

VinExpert
0
 
LVL 1

Author Comment

by:mahno
ID: 2600359
Thanx
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

Title # Comments Views Activity
repeatEnd java challenge 42 84
Unix / Linux grid computing 5 149
Folder Comparison 12 53
Problem to App 4 40
Introduction: Displaying information on the statusbar.   Continuing from the third article about sudoku.   Open the project in visual studio. Status bar – let’s display the timestamp there.  We need to get the timestamp from the document s…
Introduction: Database storage, where is the exe actually on the disc? Playing a game selected randomly (how to generate random numbers).  Error trapping with try..catch to help the code run even if something goes wrong. Continuing from the seve…
This Micro Tutorial will give you a basic overview how to record your screen with Microsoft Expression Encoder. This program is still free and open for the public to download. This will be demonstrated using Microsoft Expression Encoder 4.
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.

863 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

26 Experts available now in Live!

Get 1:1 Help Now