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VO2740: BYTE PTR minus BYTE PTR data type? 19 Nov 2021 09:49 #20464

kitz
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Posts: 82

Hello,
I use a BYTE PTR set to the beginning of a PSZ and another moving to the end.
So according to the Programmers Guide of 2.7 the subtraction end pointer minus begin pointer should give the byte count-1
I tried

LOCAL pAnf, pEnd as BYTE PTR
LOCAL dwLen as DWORD
...
dwLen := pEnd - pAnf

But I get errors
converting PTR <-> DWORD: 51423
illegal automatic conversion to DWORD: 51521
Same happens with INT and LONGINT (similar errors of course)
Any hints?
BR Kurt

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VO2740: BYTE PTR minus BYTE PTR data type? 19 Nov 2021 10:31 #20465

Chris

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Posts: 3750

Hi Kurt,

You can use

dwLen := (DWORD)pEnd - (DWORD)pAnf

but usually there's a better way of doing things in .Net than using pointers. What does the code do?

XSharp Development Team
chris(at)xsharp.eu

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VO2740: BYTE PTR minus BYTE PTR data type? 19 Nov 2021 10:46 #20466

kitz
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Posts: 82

Chris,
unfortunately that doesn't work:
bad statement syntax: 51402
This is in VO 2740, so no .net

I have strings with mixed ( !! ) Windows1252 and UTF-8 character set and try to distinguish ANSII >127 and valid UTF-8 codes to be able to partially convert UTF-8 to Windows1252 to have all on the same character set. Cleaning up mess...
I scan the PSZ-String using dereferenced pointers byte per byte.
BR Kurt

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