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What is the maximum number of characters you can put on a BSTR?

Posted on 1999-01-29
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Last Modified: 2013-11-20
What is the maximum number of characters you can put on a BSTR?
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Question by:lucent2000
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by:jhance
ID: 1328511
BSTRs are double NULL terminated and can be of any length under Win32.  Some functions that take a BSTR, however, may not be so forgiving, however...
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by:lucent2000
ID: 1328512
The correct answer is this:
Quote from Nathan

2 gig...  I would not count on that being available as physical memory and
swap space will have to  actually hold the data if it is to be in memory.  

Why?  BSTR is, by defintion a length prefixed array of data.  The length
field for Win32 is a 32-bit integer, so the largest size is 2^32.  But under
WinNT and Win95, you can only access 2 gig of addressable space (as a user
process, a kernel level process could get all 4 gig), so it is 2 gig that
could be potentially used.



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jhance earned 50 total points
ID: 1328513
I'll have to disagree.  The 2G limit is NOT a BSTR limit but rather a Win32 limit. BSTR on another platform will not have this limit.
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