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Variant Streaming Code

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Overview

This code provides two global functions, WriteVariantToStream and ReadVariantFromStream, that enable you to read and write a variant to a stream. In addition, there are two other global functions, ReadVariantFromBlob and WriteVariantToBlob, for reading and writing a variant to a BLOB.

Highlights

Here are some of the main advantages of these functions:
  • Uses any given IStream to stream the Variant into and out of.
  • Data is streamed in efficient binary form.
  • Stream is versioned for backwards compatibility.
  • Supports arbitrary size and arbitrary dimension safe-arrays.
  • Object streaming is supported if the object in variant supports IPersistStream[Init].
  • All code is in one header file (VariantStream.h) and only two routines are exposed: WriteVariantToStream and ReadVariantFromStream.
  • Comes with supporting test code that tests the header file -- in case code is modified
  • Does not use C++ exception handling.  Test project has EH flag turned..
  • Doesn't use the CRT.
  • Does not use any Direct-To-COM (VC++'s comdef.h, such as _variant_t, _bstr_t, _com_ptr, _com_error)
  • Works in both Unicode and ANSI

Downloads

Download source - 37 Kb


This article was originally published on October 9th, 2000

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