MapError = Number in Java

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MapError = Number
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End If End Function 'Calling code Private Function MyVTableEntry() As Long On Error GoTo Error 'Perform processing here Exit Function Error: MyVTableEntry = MapError End Function You must error-trap and call MapError on publicly exposed vtable functions that might throw an error, but you do not need to trap if you can guarantee that an error will never be thrown If you call COM methods, you can actually redefine a version of the COM interface with methods that return Long instead of HRESULT VB doesn't consider the return value an error without the HRESULT in the function definition The ROTHook sample shown in 10 makes all COM calls using this mechanism to catch errors I originally designed the ROTHook code to live as a DLL object, and the continued reliance on HRESULTS rather than raising exceptions makes this code easy to move into a helper DLL There are several disadvantages to doing away with the HRESULTs First, you have to create the type library You can't put two interfaces with the same IID in the same library, but you can put multiple definitions of the same interface in separate referenced type libraries Multiple definitions allow you to have one version of the interface for use inside a lightweight and another that is called from normal code Once you have the type defined, you have to write extra code to check the error-return codes You also lose the benefits of return values and property statements
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Rich Error Information HRESULT values are only part of the picture when it comes to error information The error number is easily understood by code that calls the object, but a raw error number is of very little use to an end user Users prefer text, so COM allows you to return a set of rich error information to display to the user You can set the Description, Source, HelpFile, and HelpContext appropriate for the error
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Calling code should never programmatically rely on the strings in the rich information; it should just display the information to the user If your program relies on the string information, it is subject to localization dependencies and the whims of your documentation team, If you forward error information to another caller, you can change the error number so that it falls within the range of errors returned by the program, but you should not wholly replace the description field The source of the error is best qualified to provide high-quality feedback for the user You may add text to the beginning of the description to provide an error chain, but you should keep the original information intact whenever possible You set VB's rich error information by using the properties of the Err object Err lets you set the rich error properties before calling the ErrRaise method You can also use the optional parameters in the Raise method itself Populating the Err object is only the start of the rich error information's journey from the error's source back to the calling code COM must now negotiate with the object to ensure that rich error information is available and that the information is current Error negotiation relies on the IErrorInfo interface and the SetErrorInfo and GetErrorInfo API calls IErrorInfo has methods that look a lot like the properties on the Err object; ErrDescription maps to IErrorInfoGetDescription, and so on SetErrorInfo sets the thread's current IErrorInfo reference to a specified IErrorInfo implementation, and GetErrorInfo retrieves the reference GetErrorInfo clears the thread's current reference, so you should call it only once for each SetErrorInfo call Not every caller cares about error information, so it is possible that the thread's rich error information has nothing to do with the currently running code A secondary support interface, ISupportErrorInfo, is needed to verify that the error information is current ISupportErrorInfo has one method, InterfaceSupportsErrorInfo, which takes an IID parameter that corresponds to the owning interface of the method that just returned a failing HRESULT error code Rich Error Negotiation Steps 1 The object generating the error creates an IErrorInfo implementation and calls SetErrorInfo
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