MFC ActiveX Controls: Returning Error Codes From a Method
This article describes how to return error codes from an ActiveX control method.
To indicate that an error has occurred within a method, you should use the COleControl::ThrowError member function, which takes an SCODE (status code) as a parameter. You can use a predefined SCODE or define one of your own.
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ThrowError is meant to be used only as a means of returning an error from within a property's Get or Set function or an automation Method. These are the only times that the appropriate exception handler will be present on the stack. |
Helper functions exist for the most common predefined SCODEs, such as COleControl::SetNotSupported, COleControl::GetNotSupported, and COleControl::SetNotPermitted.
For a list of predefined SCODEs and instructions on defining custom SCODEs, see the section Handling Errors in Your ActiveX Control in ActiveX Controls: Advanced Topics.
For more information on reporting exceptions in other areas of your code, see COleControl::FireError and the section Handling Errors in Your ActiveX Control in ActiveX Controls: Advanced Topics.