Porting and Upgrading OCXs and VBXs

|  Overview |  How Do I |  FAQ |  Details

As of Visual C++ 4.0, the Microsoft OLE Control Development Kit (CDK) became fully integrated with the Microsoft Foundation Class Library (MFC). For development of 32-bit ActiveX controls (formerly OLE controls), use the ActiveX Template library (ATL) or the MFC library.

You can use 16-bit controls only in 16-bit containers and 32-bit controls only in 32-bit containers. However, you can write 32-bit controls, then port them to 16 bits. (Some control features are not available in 16-bit controls.)

You can use Visual Basic controls in your Visual C++ projects, and vice versa.

To port or upgrade your ActiveX controls and Visual Basic controls, see these in-depth articles:

• Adding an ActiveX Control to an Existing CDK Project

• VBX Control Migration

• Converting a CDK Project to a Visual C++ Project