PRB: Rich Edit Control Message Handlers Are Not Called

• Microsoft Visual C++, 32-bit Editions, version 5.0

SYMPTOMS

There is a problem with the message-map entries that ClassWizard creates to handle the following Rich Edit control messages: EN_SETFOCUS, EN_KILLFOCUS. The message-map entry created by ClassWizard does not call the handler for these messages.

CAUSE

The wrong message map entries are added.

RESOLUTION

Replace the message-map entries generated for EN_SETFOCUS and EN_KILLFOCUS with the following entries:

   ON_EN_SETFOCUS(IDC_RICHEDIT1, OnSetfocusRichedit1)

   ON_EN_KILLFOCUS(IDC_RICHEDIT1, OnKillfocusRichedit1)

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

Steps to Reproduce Behavior

1. Use the MFC AppWizard to create a dialog-based application.

2. Drag a RichEdit control from the Controls palette onto the Dialog template using the Dialog Resource Editor.

3. Open ClassWizard, and choose IDC_RICHEDIT1 for the ObjectID. To add message handlers for the EN_SETFOCUS and the EN_KILLFOCUS messages, highlight the message and click Add Function.

4. Click OK, and look at the code. The following entry appears in the message-map if you selected EN_SETFOCUS:

         ON_NOTIFY(EN_SETFOCUS, IDC_RICHEDIT1, OnSetfocusRichedit1)
   

   However, this message-map entry should be:

         ON_EN_SETFOCUS(IDC_RICHEDIT1, OnSetfocusRichedit1)
   

   The following entry is also in the message-map if you selected EN_KILLFOCUS:

         ON_NOTIFY(EN_KILLFOCUS, IDC_RICHEDIT1, OnKillfocusRichedit1)
   

   However, this message-map entry should be:

         ON_EN_KILLFOCUS(IDC_RICHEDIT1, OnKillfocusRichedit1)
   

5. If you build and run this project to see the problematic behavior, remember to add the line AfxInitRichEdit(); in the InitInstance() function of the CWinApp derived class.

6. You can use the default handler created by ClassWizard and add a TRACE statement. Following is an example for the EN_KILLFOCUS message:

         void CMyDialog::OnSetfocusRichedit1(NMHDR* pNMHDR, LRESULT* pResult)
         {
            TRACE("This function will never be called\n");
            *pResult = 0;
         }
   
   

7. The TRACE statement does not execute when you run a Debug build.

REFERENCES

For additional information, please see the following articles in the Microsoft Knowledge Base:

   ARTICLE-ID: Q166132
   TITLE     : PRB: Dialog With RichEdit May Fail During Creation

   ARTICLE-ID: Q165744
   TITLE     : BUG: RichEditCtrl IDs Not Shown in Member Variables Tab