July 2003
Intermediate to advanced
736 pages
16h 35m
English
Content preview from Visual Basic® .NET Power CodingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Understanding Error Handling in COM Interop
COM Interop supports error handling from .NET to COM and from COM to .NET. Each HResult in COM is mapped to a .NET exception. Hence, if an exception is thrown in a .NET source, the CCW maps the exception to an HResult using the ISupportErrorInfo interface, which results in an Err object being created in VB6. If a VB6 COM source raises an error, the RCW converts the VB6 COM HResult into a .NET exception, and the mapped exception is thrown in .NET. Check out the VS .NET help topic ms-help://MS.VSCC/MS.MSDNVS/cpguide/html/cpconhresultsexceptions.htm for a complete mapping between HResult values and .NET exception classes.
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