Microsoft KB Archive/168289

= PRB: Toolbar Buttons Not Updated/Painted Correctly in Windows 95 =

Article ID: 168289

Article Last Modified on 11/21/2006

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APPLIES TO

 Microsoft Foundation Class Library 4.2, when used with:  Microsoft Visual C++ 4.0 Standard Edition

 Microsoft Visual C++ 4.1 Subscription

 Microsoft Visual C++ 4.2 Professional Edition

 Microsoft Visual C++ 4.2 Enterprise Edition</li></ul>

 Microsoft Visual C++ 4.2 Professional Edition</li></ul>

 Microsoft Visual C++ 5.0 Enterprise Edition</li></ul>

 Microsoft Visual C++ 5.0 Professional Edition</li></ul> </li></ul>

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This article was previously published under Q168289

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SYMPTOMS
Buttons on a toolbar that were created using CToolBar may not update or paint correctly if the buttons have text associated with them. This happens only on Windows 95 machines with Internet Explorer 3.x installed.

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CAUSE
This is due to a bug in the ComCtl32.dll (version 4.70) that is installed with Internet Explorer 3.x.

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RESOLUTION
To work around this problem, derive a class from CToolBar and override DefWindowProc as follows: // MyToolBar.h : headerfile class CMyToolBar : public CToolBar {  ...   protected: virtual LRESULT DefWindowProc(UINT message, WPARAM wParam,        LPARAM lParam); ...  };

// MyToolBar.cpp : implementation file #include "stdafx.h"  #include "mytoolbar.h"   ... LRESULT CMyToolBar::DefWindowProc(UINT message, WPARAM wParam,     LPARAM lParam) {     // the toolbar common control does not handle these messages well // if the WS_VISIBLE style is not turned on under Windows 95 DWORD style = GetStyle; if (message == TB_DELETEBUTTON || message == TB_INSERTBUTTON) {        if (!(style & WS_VISIBLE)) {           ModifyStyle(0,WS_VISIBLE); }     }      LRESULT lresult = CToolBar::DefWindowProc(message, wParam, lParam); if (message == TB_DELETEBUTTON || message ==TB_INSERTBUTTON) {        if (!(style & WS_VISIBLE)) {           ModifyStyle(WS_VISIBLE,0); }     }      return lresult; } You can derive the CToolBar by using ClassWizard to derive from "generic CWnd" and changing all CWnd references to CToolBar.

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STATUS
Because Microsoft Visual C++, version 6.0 requires Internet Explorer 4.01, Service Pack 1, this problem no longer exists in Visual C++, version 6.0.

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Steps to Reproduce Behavior
Add the following code to CMainFrame::OnCreate in a Default Appwizard Application: BOOL CMainFrame::OnCreate(...) {     ...      m_wndToolBar.SetButtonText(0,"New"); m_wndToolBar.SetButtonText(1,"Open"); m_wndToolBar.SetButtonText(2,"Save"); m_wndToolBar.SetButtonText(4,"Cut"); m_wndToolBar.SetButtonText(5,"Copy"); m_wndToolBar.SetButtonText(6,"Paste"); m_wndToolBar.SetButtonText(8,"Print"); m_wndToolBar.SetButtonText(9,"About");

CRect temp; m_wndToolBar.GetItemRect(0,&temp); m_wndToolBar.SetSizes( CSize(temp.Width,temp.Height),        CSize(16,15));

return 0;

} (c) Microsoft Corporation 1997, All Rights Reserved. Contributions by Sridhar S. Madhugiri, Microsoft Corporation

Keywords: kbnoupdate kbtoolbar kbuidesign kbprb KB168289

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