Variant Streaming Code

.

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