How to write TO a string with ASM?

[Clay Clear]

The following code always generates a Windows "...has peformed illegal function..."
error. It has been through MANY permutations, to no avail:

DEFSTR S
DEFWRD W
DEFINT I
 
S = " "
 
WSeg1 = CODESEG(Table1)
WPtr1 = CODEPTR(Table1)
 
WSeg2 = STRSEG(S)
WPtr2 = STRPTR(S)
 
! db &H66
! db &H60
 
! mov ds, WSeg1
! mov si, WPtr1
 
! mov es, WSeg2
! mov di, WPtr2
 
! mov al, ds:[si]
! mov es:[di], al
 
! db &H66
! db &H61
 
PRINT S
 
END(0)
 
Table1:
! db 084

I have tried replacing the Table1: with a second string that had
a letter in it. No luck. I have tried using CODEPTR32() and STRPTR32()
with ! lds and ! les, same results. I tried using ! movsb, with
no luck. So, I am forced to the conclusion that the error is being
generated by the program's trying to write to illegal memory.
Strangely enough, I have not had this problem with using ! mov
where its destination operand was a numeric variable - it only seems
to happen when it's a string variable.

Any replies gratefully received.


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[This message has been edited by Clay Clear (edited February 04, 2003).]

[Clay Clear]

Disregard! I just found out that I have to use VARPTR(SEG) on the
strings, *not* STRPTR(SEG).

Thanks anyway to anybody who might have replied.


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