PRB: Windows 95 Common Controls Not Supported by Ctl3d32.dll

WINDOWS        | WINDOWS NT

The information in this article applies to:

• The Microsoft Foundation Classes (MFC) included with: Microsoft Visual C++, 32-bit Edition, versions 2.2 and 4.0
• Win32s version 1.30

SYMPTOMS

The Windows 95 common controls can be used under Win32s version 1.3 and Windows NT version 3.51. However, these controls will not appear in 3D if 3D controls are enabled under Windows NT version 3.51 and Win32s version 1.3. These controls will show up in 3D if 3D controls are enabled under Windows 95 only.

CAUSE

The 3D look of standard controls under Windows NT 3.51 and Win32s version 1.3 is provided by Ctl3d32.dll. Ctl3d32.dll does not support 3D effects for any of the Windows 95 common controls. These controls show up as 3D under Windows 95 because the drawing for these controls is handled by User32.dll under Windows 95.

RESOLUTION

To give Windows 95 common controls a 3D look under Windows NT 3.51 and Win32s version 1.3 in an MFC application, perform these steps:

1. In your override of CWinApp::InitInstance, call Enable3dControls(). This will initialize the Ctl3d32.dll file.

2. For each control you want to have the 3D effect, call the CWnd member function SubclassCtl3d, and pass a parameter of 1 for the nControlType parameter (the only parameter this function takes). Call this function before the control is displayed -- for a CDialog object this would be in the OnInitDialog function; for a CFormView, this would be in the OnInitialUpdate; and for any other window, this should be done right after the control is created.

NOTE: If you plan to use this approach, you need to have the proper version of Ctl3d32.dll on your system. This DLL should reside in the <Windows NT Dir>\System32 directory for 32-bit systems or in the <Windows Dir>\System directory for 16-bit systems using Win32s. The version of the DLL you must use is 2.29.00 or later.

STATUS

This behavior is by design.

MORE INFORMATION

Calling Enable3dControls in your override of CWinApp::InitInstance will load and initialize Ctl3d32.dll. If you call the CWnd member function Subclass3dCtl and pass a parameter of 1 for the following controls, they will appear with a 3D looking border around them in your application:

   Progress Control
   TreeView Control
   ListView Control
   Slider Control
   Tab Control
   Animate Control
   Spin Control

   /* Ctl3d Control ID*/

Please note that this is a workaround to the problem that Ctl3d32.dll does not support Winodws 95 common controls, it is not a limitation of the Win32s or the Windows NT 3.51 operating systems because they are not inherently 3D. (Any 3D support found in these operating systems is provided by another support such as Ctl3d32.dll.) Ctl3d32.dll is designed to give a 3D look only to the controls listed in the /* Ctl3d Control ID*/ section of Ctl3d.h. If you choose to use this workaround, you should test your programs thoroughly. Furthermore, there is no guarantee that Ctl3d32.dll would support this capability in future releases.

Sample Code

// This code shows how to give Windows 95 common controls a 3D look
// in an MFC application.

// Initialize Ctl3d32.dll as shown below. A default
// AppWizard-generated application will already have this code:

  Enable3dControls();
  ...

// If you have a member variable associated with the control,
// use code similar to the following in your OnInitDialog or your
// OnInitialUpdate function.

   m_Progress.SubclassCtl3d(1);

// If you do not have a variable associated with the control,
// then you can use GetDlgItem to obtain one, for example:

   GetDlgItem(IDC_PROGRESS1)->SubclassCtl3d(1);

REFERENCES

For more information, please see the article "Adding 3-D Effects to Controls" by Wes Cherry and Kyle Marsh. This article can be found on the MSDN July 1995 compact disc in the following place:

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