MFC does not call the CPrintDialog::OnInitDialog function in Visual C++ 6.0 (193272)

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.

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.

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(CMyPrintDialog)
      //}}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.

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://msdn.microsoft.com/vstudio/downloads/updates/sp/vs6/default.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

MORE INFORMATION

Steps to reproduce the behavior

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