PRB: Custom Control or Library Not Working with VB 4.0

 Last reviewed: October 30, 1995
Article ID: Q118767
The information in this article applies to:

- Standard and Professional Editions of Microsoft Visual Basic, 

  16-bit and 32-bit, for Windows, version 4.0

SYMPTOMS

It is possible that a custom control or dynamic link library that used undocumented features of Visual Basic version 3.0 will not work correctly in Visual Basic version 4.0.

CAUSE

Visual Basic version 4.0 is designed to be backward compatible. However, some third-party companies have based custom controls and routines on undocumented features in Visual Basic version 3.0. The internal structure of Visual Basic has changed significantly for version 4.0. Therefore, controls and libraries based on undocumented features or undocumented internal structures may no longer work.

RESOLUTION

If you find that your third-party custom control or library that worked in Visual Basic version 3.0 is not working correctly in Visual Basic version 4.0, please contact the third-party add-on manufacturer. The company may have an updated version designed to work with Visual Basic version 4.0.

Additional reference words: 4.00 vbx incompatible incompatibility vb4all
vb4win
KBCategory: kb3rdparty kbprg kbprb
KBSubcategory: PrgCtrlsThird

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Last reviewed: October 30, 1995
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