Microsoft KB Archive/153677

= PRB: Implementing Stock Error Event in Custom OLE Control =

Article ID: 153677

Article Last Modified on 6/24/2004

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APPLIES TO


 * Microsoft Visual Basic 4.0 Standard Edition
 * Microsoft Visual Basic 4.0 Professional Edition
 * Microsoft Visual Basic 4.0 Professional Edition
 * Microsoft Visual Basic 4.0 16-bit Enterprise Edition
 * Microsoft Visual Basic 4.0 32-Bit Enterprise Edition

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This article was previously published under Q153677



SYMPTOMS
Visual Basic generates an error message if the MFC Class Wizard's stock Error event is implemented in a custom OLE Control.

For example, if you go to the OLE Events tab in the MFC Class Wizard and add the stock Error event, you will get the following definition in the control's ODL file: dispinterface _DTestEvents {    properties: // Event interface has no properties

methods: // NOTE - ClassWizard will maintain event information here. //   Use extreme caution when editing this section. //AFX_ODL_EVENT }; This will generate the following event stub in Visual Basic: Private Sub Test1_Error(Number As Integer, Description As String, _           Scode As Error, Source As String, HelpFile As String, _            HelpContext As Long, CancelDisplay As Boolean)

End Sub



RESOLUTION
To avoid the error generated by Visual Basic, you need to change the event definition of the stock error event in the ODL such that the third parameter is of type long instead of SCODE:

[id(DISPID_ERROREVENT)] void Error(short Number, BSTR* Description, long Scode, BSTR Source, BSTR HelpFile, long HelpContext,boolean*CancelDisplay);

This will change the third parameter in the Visual Basic event stub from "Scode As Error" to "Scode As Long," and the error will no longer be generated.



STATUS
This behavior is by design.

Additional query words: 4.00 vb4win vb4all vbctrl

Keywords: kbprb kbctrl KB153677

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