Microsoft KB Archive/193272

= MFC does not call the CPrintDialog::OnInitDialog function in Visual C++ 6.0 =

Article ID: 193272

Article Last Modified on 8/7/2007

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APPLIES TO

 Microsoft Foundation Class Library 4.2, when used with:  Microsoft Visual C++ 6.0 Enterprise Edition

 Microsoft Visual C++ 6.0 Professional Edition

 Microsoft Visual C++ 6.0 Standard Edition 

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This article was previously published under Q193272

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SYMPTOMS
The OnInitDialog function (which is called in response to a WM_INITDIALOG message) for a CPrintDialog-derived class, was called in MFC prior to Visual C++ 6.0. However, this is no longer true for MFC DLLs of Visual C++ 6.0. Therefore, programs that rely on OnInitDialog to be called will not work as expected.

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CAUSE
Previously, MFC set up a message hook for CPrintDialog. This hook was the only way to catch a WM_INITDIALOG message. MFC for Visual C++ 6.0 purposely removed this hook so MFC applications would automatically get the new Print dialog by default on Windows 2000; however, this causes applications that rely on CPringDialog::OnInitDialog to fail to work.

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RESOLUTION
Set up the message hook function, _AfxCommDlgProc, in the constructor of your CPrintDialog-derived class as shown below: // CMyPrintDialog is a CPrintDialog-derived class. CMyPrintDialog::CMyPrintDialog(DWORD dwFlags) : CPrintDialog(FALSE,dwFlags) {     //AFX_DATA_INIT // MFCBUG: MFC 6.0 doesn't set the message hook! m_pd.Flags |= PD_ENABLEPRINTHOOK | PD_ENABLESETUPHOOK; // _AfxCommDlgProc is exported from static MFC libraries m_pd.lpfnPrintHook = _AfxCommDlgProc; m_pd.lpfnSetupHook = _AfxCommDlgProc; } Then, make your project statically linked to MFC.

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STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been fixed in the Visual Studio 6.0 Service Pack 1.

To obtain this service pack, visit the following MIcrosoft Developer Network (MSDN) Web site:

http://msdn2.microsoft.com/en-us/vstudio/Aa718362.aspx

For more information about Visual Studio 6.0 Service Pack 1, click the following article numbers to view the articles in the Microsoft Knowledge Base:

193009 Visual Studio 6.0 Service Pack 1 readme

194022 Visual Studio 6.0 service packs, what, where, why

194295 How to tell that a Visual Studio service pack is installed

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Steps to reproduce the behavior

 * 1) Derive a class from CPrintDialog.
 * 2) Add a message handler for WM_INITDIALOG in the CPrintDialog-derived class. The message handler OnInitDialog is not called in Visual C++ 6.0.

(c) Microsoft Corporation 1998, All Rights Reserved. Contributions by Yeong-Kah Tam, Microsoft Corporation.

Keywords: kbtshoot kbbug kbcmndlg kbfix kbvs600sp1fix KB193272

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