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How can we transfer a PUNICODE_STRING to PCHAR?  PWCHAR to PCHAR?

Posted on 2002-03-20
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Last Modified: 2008-02-01
How can we transfer a PUNICODE_STRING to PCHAR?  PWCHAR to PCHAR?
This question is about a program with  Visual C++.
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Question by:mathematics
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5 Comments
 
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Expert Comment

by:jkr
ID: 6884482
?

PUNICODE_STRING pustr = ...;
PWCHAR pw = pustr->Buffer;

should do it...
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Expert Comment

by:ssr
ID: 6889847
Be careful here, since Unicode strings will have every other byte as a zero.  I suspect with the above code sample you will truncate your string to either zero or one bytes, from the PCHAR point of view.  

There are C Run time routines to do these conversions.  Lookup converting Unicode to ASCII and converting ASCII to Unicode.

SSR
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jkr earned 50 total points
ID: 6889871
>>from the PCHAR point of view

That's why I wrote

PWCHAR pw = pustr->Buffer;

A 'UNICODE_STRING' (like the NT Native API uses it) is

typedef struct _UNICODE_STRING {
    USHORT Length;
    USHORT MaximumLength;
#ifdef MIDL_PASS
    [size_is(MaximumLength / 2), length_is((Length) / 2) ] USHORT * Buffer;
#else // MIDL_PASS
    PWSTR  Buffer;
#endif // MIDL_PASS
} UNICODE_STRING;
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