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Index > Windows > Basic Strings (BSTRs)

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Azu



Joined: 16 Dec 2008
Posts: 1160
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
Post 06 Feb 2009, 06:01
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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? Confused


Hi Azu,

the terminator is used to convert a BSTR to a C-String or a C-Style-String easyly.
Post 11 Feb 2009, 14:20
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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
Post 11 Feb 2009, 14:39
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bitRAKE



Joined: 21 Jul 2003
Posts: 2888
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?)
Post 11 Feb 2009, 17:26
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Alexander



Joined: 22 Dec 2008
Posts: 40
Alexander
Thanks bitRAKE
Post 11 Feb 2009, 17:36
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