FIX: ClassWizard Generates Bad Code for Tree View Messages

The information in this article applies to:

• The ClassWizard included with: Microsoft Visual C++, 32-bit Edition, version 2.1

SYMPTOMS

The Class Wizard generates the following incorrect code for the TVN_BEGINLABELEDIT, TVN_ENDLABELEDIT, TVN_GETDISPINFO, TVN_SETDISPINFO, and TVN_KEYDOWN Tree View Control notification messages.

void CMyDialog::OnXXXXtreeview1(NMHDR* pNMHDR, LRESULT* pResult)

   NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
   // TODO: Add your control notification hander code here

   *pResult = 0;

RESOLUTION

For TVN_BEGINLABELEDIT, TVN_ENDLABELEDIT, TVN_GETDISPINFO, and TVN_SETDISPINFO, the pNMHDR parameter should be cast to a TV_DISPINFO*. For example:

void CMyDialog::OnXXXXtreeview1(NMHDR* pNMHDR, LRESULT* pResult)

   TV_DISPINFO* pTVDispInfo = (TV_DISPINFO*)pNMHDR;
   // TODO: Add your control notification hander code here

   *pResult = 0;

For TVN_KEYDOWN, the pNMHDR parameter should be cast to a TV_KEYDOWN*. For example:

void CMyDialog::OnXXXXtreeview1(NMHDR* pNMHDR, LRESULT* pResult)

   TV_KEYDOWN* pTVKeyDown = (TV_KEYDOWN*)pNMHDR;
   // TODO: Add your control notification hander code here

   *pResult = 0;

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem was corrected in Visual C++ version 4.0.