Q157142: PRB:CFormView/Dialogs Sized Larger Under Win32s/WinNT 3.50

Article: Q157142
Product(s): Microsoft C Compiler
Version(s): winnt:2.0,2.1,2.2,4.0,4.1
Operating System(s): 
Keyword(s): kbDocView kbMFC kbOSWinNT310 kbOSWinNT350 kbOSWinNT351 KbUIDesign kbVC210 kbVC220 kbVC4
Last Modified: 04-AUG-2001

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The information in this article applies to:

- The Microsoft Foundation Classes (MFC), used with:
   - Microsoft Visual C++, 32-bit Editions, versions 2.0, 2.1, 2.2, 4.0, 4.1 
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SYMPTOMS
========

CFormViews and Dialogs will appear larger when running under Win32s or versions
of Windows NT earlier than 3.51. This can cause problems if the dialog template
was sized so it would fit on a screen in 640x480 resolution or if special sizing
was done.

CAUSE
=====

Win32s and versions of Windows NT before 3.51 used bold fonts for dialogs.
Because dialog templates are designed in dialog units, and dialog units are
based on the average font size, this will cause the dialogs to be resized.

RESOLUTION
==========

The easiest workaround is to create two dialog templates: one sized for Windows
95 and Windows NT 3.51 or later, and one sized for Win32s and Windows NT version
3.5 or earlier. All of the controls on the two dialog templates should have the
same ID so they can be used interchangeably with the same CFormView or CDialog
class.

The sample code below demonstrates this workaround with a default Visual C++ 4.x
AppWizard-created CFormView derived class.

STATUS
======

This behavior is by design.

MORE INFORMATION
================

The font is automatically changed to bold inside the Windows dialog manager
under Win32s and Windows NT version 3.5 and it is not possible to change this
behavior. Furthermore, it is not possible to specify a bold version of a font or
to use the same font on all platforms because the font is specified only by its
typeface name in the dialog template.

It is easy to change the font inside the dialog or CFormView after it is
displayed by calling CWnd::SetFont(). However, this will not resize the dialog
because it is sized based on the font specified in the dialog template.

While it's possible to resize the dialog in the OnInitDialog(), all of the
controls will also need to be resized. This can be tedious and slow if there are
a lot of controls in the dialog template.

The following steps show the changes necessary to use multiple dialog templates
in a Visual C++ 4.x AppWizard-created project.

Sample Code
-----------

1. Add a static member variable in the CFormView or Dialog to hold the template
  that is used:

     ////////////////////////////////////////// 
     // CFormViewView.h

     class CFormViewView : public CFormView
     {

         /// .... Standard code omitted

     public:
         //{{AFX_DATA(CFormtestView)
         enum{ IDD = IDD_FORMVIEW_REGULAR };
             // NOTE: the ClassWizard will add data members here
         //}}AFX_DATA
         static int m_nIDD; //The ID for the dialog template that is used

     // Attributes
     public:

         /// .... Standard code omitted

     };

2. Initialize the static member variable, and change the constructor of the
  CFormView derived class to use it:

     //////////////////////////////////////////////////////////////////////// 
     // 
     // CFormViewView.CPP

     //construction/destruction

     //Set the default dialog template to IDD_FORMVIEW_REGULAR
     int CFormViewView::m_nIDD = IDD_FORMVIEW_REGULAR;

     CFormViewView::CFormViewView()
         : CFormView(m_nIDD) //Use the static member variable for the
                             // template
     {

         /// .... Standard code omitted

     }

3. Before any CFormViews/Dialogs are created, check the version, and use the
  appropriate template:

     //////////////////////////////////////////////////////////////////////// 
     /// 
     // CFormViewApp.CPP

     BOOL CFormViewApp::InitInstance()
     {
         /// .... Standard code omitted

        //Check version
        OSVERSIONINFO osvi;
        memset(&osvi, 0, sizeof(OSVERSIONINFO));
        osvi.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
        GetVersionEx (&osvi);

        //Set alternative template based on platform
        if ((osvi.dwPlatformId == VER_PLATFORM_WIN32s) ||
            ((osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) &&
             (osvi.dwMajorVersion == 3) && (osvi.dwMinorVersion < 51)))
           CFormtestView::m_nIDD = IDD_FORMVIEW_BOLD;

         // Dispatch commands specified on the command line
         if (!ProcessShellCommand(cmdInfo))
             return FALSE;

         return TRUE;
     }
     }

Additional query words: 2.00 2.10 2.20 4.00 4.10 W32s kbdsd

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Keywords          : kbDocView kbMFC kbOSWinNT310 kbOSWinNT350 kbOSWinNT351 KbUIDesign kbVC210 kbVC220 kbVC400 kbVC410 kbOSWin32s kbGrpDSMFCATL kbNoUpdate 
Technology        : kbAudDeveloper kbMFC
Version           : winnt:2.0,2.1,2.2,4.0,4.1
Issue type        : kbprb

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