PRB: Problem Using Visual C++ v4.2b OLE Controls in VB v4.0

• Microsoft Visual C++, 32-bit Editions, versions 4.2, 5.0

SYMPTOMS

If you create an Appwizard-generated control using Visual C++ 4.2b or 5.0, you may not be able to use that control on some Windows 95 or Windows NT 3.51 machines. Two problems may occur: problems registering the control with the system registry, or problems loading the control for use in the Visual Basic 4.0 development environment. If you try to load the control using the Custom Controls dialog box in Visual Basic 4.0, you may see the error message "Error in loading DLL."

CAUSE

ActiveX controls built with the Visual C++ 4.2b technology update or Visual C++ 5.0, have dependencies to the newer version of Oleaut32.dll. If that DLL is missing, you may have problems registering and using the control. With Visual Basic, the type information generated for an ocx control implicitly imports type information that is contained in a file called Stdole2.tlb. If that type information is not on the target machine, Visual Basic reports an error loading the DLL into the Visual Basic development environment.

RESOLUTION

The Help topic called "OLE Controls, Distributing OLE Controls" lists the following files that you should redistribute with an MFC ActiveX control:

   Mfcx0.dll      MFC DLL (ANSI)
   Mfcx0u.dll     MFC DLL (Unicode)
   Msvcrtx0.dll   C run-time libraries
   Olepro32.dll   OLE property frame and standard types support
   Regsvr32.exe   Control registration utility 

© Microsoft Corporation 1996, All Rights Reserved.
Contributions by Michael Dice, Microsoft Corporation

Keywords : kbole kbCtrl kbMFC kbVC
Version : 4.2 5.0
Platform : NT WINDOWS
Issue type : kbprb