Pointer to a string

[xroot]

Is there a way to get or convert a string pointer to "equ" text?

Text db "A text string",0
TXT equ offset Text
print TXT,10    ;will show "A text string"

But TXT by itself evaluates to "offset Text"
How can I get TXT to evaluate to A text string.
TXT equ <A text string> with a string pointer.

[dedndave]

the question is a bit out of context, i think
if you show us how you intend to use the EQUate, we can give more information

but, you can make the EQUate resolve to a string
that string, however, will only have meaning at assembly-time - it cannot be referenced at run-time

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MyTXT   TEXTEQU <A text string>

maybe this is what you are trying to do...

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MyTXT   TEXTEQU <offset TXTStr>

        .data
TXTStr  db "A text string",13,10,0

        .code
        print   MyTXT
the assembler simply substitutes the text "MyTXT" with "offset TXTStr", prior to assembly-time evaluation

[xroot]

In my Dll a string pointer to a structure name is passed.
What I need is the sizeof the structure.

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sRec equ <offset Txt>
sSize equ <sizeof sRec>  <-This is what I can't figure out.
                                       I would think that sRec should
                                       be replaced with structure name.
.data
Txt  db "NONCLIENTMETRICS",0
.code



Thamks

[dedndave]

well - you shouldn't need to use EQUates, at all

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        .data?
NcmStruc NONCLIENTMETRICS <>
; cbSize As Long
; iBorderWidth As Long
; iScrollWidth As Long
; iScrollHeight As Long
; iCaptionWidth As Long
; iCaptionHeight As Long
; lfCaptionFont As LOGFONT
; iSMCaptionWidth As Long
; iSMCaptionHeight As Long
; lfSMCaptionFont As LOGFONT
; iMenuWidth As Long
; iMenuHeight As Long
; lfMenuFont As LOGFONT
; lfStatusFont As LOGFONT
; lfMessageFont As LOGFONT

        .code

        mov     NcmStruc.cbSize,sizeof NcmStruc

then pass the address of the structure as "offset NcmStruc"

notice that LOGFONT is also a structure (length of 60 bytes, i think)
"long"s are dwords in asm-speak   :bg
i come up with a NONCLIENTMETRICS structure size of 340 bytes

[jj2007]

What I need is the sizeof the structure.

Try this...

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include \masm32\include\masm32rt.inc

.code
start: inkey str$(NONCLIENTMETRICS)
exit

end start


Output: 340

[hutch--]

try it this way to get a direct pointer to data in the .DATA section.

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    item db "Howdy Folks",0
    pitem dd item


Variable "pitem" is a pointer to the data "item". Note that you put pitem after item.

[jj2007]

try it this way to get a direct pointer to data in the .DATA section.

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    item db "Howdy Folks",0
    pitem dd item


Variable "pitem" is a pointer to the data "item". Note that you put pitem after item.

I always put pitem before item, for alignment reasons. What's wrong with that?

[xroot]

OK, let me explain more, in my Dll the pointer can be any structure name.
So there are no hard coded db statements. This is it.

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.data
aStruc dd 0
sRec   equ offset aStruc
.code

GetStrucPtr proc iStruc:dword
    m2m aStruc,iStruc
    mov eax,sRec
    ret
GetStrucPtr endp



[clive]

Unfortunately it's still a code fragment, perhaps you can provide a more complete example of both ends? It's not particularly obvious what you're trying to achieve, or how iStruc or aStruc might be used in a larger context.

Couldn't you loose the whole sRec thing and use something like this?

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.data
aStruc dd 0
.code

GetStrucPtr proc iStruc:dword
    m2m aStruc,iStruc
    lea eax,aStruc
    ret
GetStrucPtr endp


[Farabi]

If you want to have the string length use lstrlen. You cannot use equ to since equ is not a pointer.