Re: Message handling in class

Thank you, Dave. I knew this approach, but when I did this:

void CtreeDlg::OnItemexpandingTree(NMHDR* pNMHDR, LRESULT* pResult)
{
    fsp.OnItemexpandingTree(pNMHDR, pResult);
}

runtime error occured in this line (which is outside of
FileSystemParser::OnItemexpandingTree method -- in )

NETRESOURCE *const pNetResource = (NETRESOURCE *)(Tree-


it says: "Unhandled exception at 0x78a74dee (mfc90ud.dll) in tree.exe:
0xC0000005: Access violation reading location 0x00000020."

HERE:

// winctrl2.cpp
DWORD_PTR CTreeCtrl::GetItemData(HTREEITEM hItem) const
{
    ENSURE(::IsWindow(m_hWnd)); // <---- here error happens
        // ......... other code
}

If you need the code:

void FileSystemParser::OnItemexpandingTree(NMHDR* pNMHDR, LRESULT*
pResult)
{
    TRACE( _T("CDlgGetPath::OnItemexpandingTree(%p)\n"), pNMHDR );
    CWaitCursor CursorWaiting; //Show the wait cursor while
expanding
    NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
    ASSERT( pNMTreeView );
    ASSERT( pResult );
    //Only action 2 notifications
    if( pNMTreeView->action == 2 )
    {
        //Update location display
        CString sPath = GetItemPath( pNMTreeView->itemNew.hItem );
        //Refresh children
        if( !Tree->GetChildItem( pNMTreeView->itemNew.hItem ) )
        {
            PopulateTree(pNMTreeView->itemNew.hItem );
            if(Tree->GetSelectedItem( ) != pNMTreeView->itemNew.hItem )
                Tree->SelectItem( pNMTreeView->itemNew.hItem );
        }
    }
    *pResult = 0;
}

CString FileSystemParser::GetItemPath( HTREEITEM hItem )
{
    TRACE( _T("CtreeDlg::GetItemPath(%p)\n"), hItem );
    CString sRet;
    do
    {
        //End with a share name.
        NETRESOURCE *const pNetResource = (NETRESOURCE *)(Tree-
        
if( pNetResource )
        {
            sRet = CString(pNetResource->lpRemoteName) + _T('\\')+ sRet;
            break;
        }
        //Add the directory name to the path.
        sRet = Tree->GetItemText( hItem ) + _T('\\')+ sRet;
        hItem = Tree->GetParentItem( hItem );
    } while( hItem );
    return sRet;
}