Re: BSTR and const BYTE*

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
Thu, 8 Nov 2007 09:03:43 -0500
"Andrew Brook" <> wrote in message

Hi everyone,

I'm not so hot on ATL or c++ so please be gentle :)

I have a file that contains some data, for example purposes let's say the
file contains the letters of the alphabet followed by a character with an
accent on it. The number of bytes in my file is 28 (1 per alpha character
and 2 for the special character). I create a stream to this data and pass
the stream into another function. This is good.

I now have another function where the same data is passed in as a BSTR
parameter (the data is coming from .NET). If I understand the BSTR
correctly then theres 4 bytes at the beginning for the length, followed by
2 bytes per character, followed by some empty value to close the string.
I'd now like to get the data in the BSTR in the same format as defined
above (1 byte per alpha character and 2 for the special character), is
this possible? ideally i'd like to get the data in a const BYTE* but i'm
having no luck.

Hopefully someone can understand what i'm going on about :)

CComBSTR is an ATL class that is a BSTR and adds extra methods for working
with BSTRs.

This call will copy bytes into the BSTR and can be passed to anything that
requires a BSTR:

  CComBSTR bs;
  bs.AppendBytes((const char*)your_byte_pointer, your_length_in_bytes);

Scott McPhillips [VC++ MVP]

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