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

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.
To perform step 2, you need to have a member variable that is associated
with the control, or you need to get a CWnd pointer (*) that is associated
with the control. The Sample code at the end of this article shows both
techniques.


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
Calling Subclass3dCtl will call the Ctl3d32.dll function Ctl3dSubclassCtlEx
and pass it the HWND of your control and the value of 1 for the ControlID.
The valid control IDs that can be used with Ctl3d32.dll are listed in the
header file Ctl3d.h under the heading:

   /* Ctl3d Control ID*/ 
The value 1 corresponds to a list box control, so actually what you are
telling Ctl3d32.dll is that you are subclassing a list box control. Because
the DLL only handles the painting of the border of the control, this method
should work with the previously listed controls.


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:CMyApp::InitInstance(){  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:


Technical Articles
Windows Articles
User Interface Articles
Windows(16-bit)Only
This article discusses the implementation of earlier versions of
Ctl3d32.dll.
Lastnosti

ID članka: 138564 – Zadnji pregled: 14. feb. 2017 – Revizija: 1

Povratne informacije