Basic Strings (BSTRs)

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Azu

Joined: 16 Dec 2008
Posts: 1159

Azu

Alexander wrote:

Length Prefix | Data itself | Terminator

4 Byte | 2 Bytes * number of characters | NULL

Just out of curiosity.. what is the terminator used for if there is a length prefix? Confused

06 Feb 2009, 06:01

Alexander

Joined: 22 Dec 2008
Posts: 40

Alexander

Azu wrote:

Alexander wrote:
Length Prefix | Data itself | Terminator

4 Byte | 2 Bytes * number of characters | NULL
Just out of curiosity.. what is the terminator used for if there is a length prefix?

Hi Azu,

the terminator is used to convert a BSTR to a C-String or a C-Style-String easyly.

11 Feb 2009, 14:20

Alexander

Joined: 22 Dec 2008
Posts: 40

Alexander

bitRAKE,

thanks for your suggestions. Japheth's website is great, but not directly what I wanted. Isn't there a simple solution to create a structure in FASM and to export it to the caller (in my case this would be any language which uses the component object model for string manipulation like VB6)?

Thanks
Alexander

11 Feb 2009, 14:39

bitRAKE

Joined: 21 Jul 2003
Posts: 2914
Location: [RSP+8*5]

bitRAKE

Japheth defines BSTR as "BSTR typedef ptr word" and looking over the code we see stuff like:

Code:

invoke SysAllocStringByteLen, NULL, MAX_PATH
mov [bstr],eax
.
.
.
invoke WideCharToMultiByte,CP_ACP,0,\
 [bstr],-1,addr szValue, sizeof szValue,0,0
.
.
.
invoke SysFreeString, [bstr]

Maybe, I'm missing something because he never uses the BSTR directly, afaik.
(Looks like he is using a UTF-16 string - not a BSTR?)

11 Feb 2009, 17:26

Alexander

Joined: 22 Dec 2008
Posts: 40

Alexander

Thanks bitRAKE

11 Feb 2009, 17:36

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