loading adress from constant

[GouShou]

Hi everybody!

Like my question most likely reveals I'm very new to assembler.

This code works absolutely fine:

Code Select Expand

mov ebx, Nr
mov ebx, [ebx*4+55E0B8h]
                invoke wsprintf, addr text, CTEXT("Nr: %d"), addr Byte PTR DS: [ebx]


While this displays only nonsense on the screen:

Code Select Expand


.const
BA dd 55E0B8h
;...
.code
;...
mov ebx, Nr
mov ebx, [ebx*4+BA]
                invoke wsprintf, addr text, CTEXT("Nr: %d"), addr Byte PTR DS: [ebx]


So how do I put the adress 55E0B8 into a constant, while it works like i did not?

I tried google and everything, but didn't find help.
I appreciate any help. :)

[TNick]

Hello, GouShou, and welcome at board!!
You don't have to declare BA as a constant. Use an EQU instead:

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BA   EQU   55E0B8h

mov ebx, Nr
mov ebx, [ebx*4+BA]
.
.
.


This works fine. Take this advice , too, from Donkey!

If you want to use a variable, you can do this:

Code Select Expand


.DATA
BA dd 55E0B8h

.CODE
mov ebx, Nr
mov eax, BA
mov ebx, [ebx*4+eax]
.
.
.

Regards,
Nick

[GouShou]

Works! Thank you a lot.  :bg

I take the second version, as recommended. :)

[TNick]

As you wish, but, if you don't need to change the value of BA with some calculation, I would recommend the first choice, because second one needs one more instruction..

Regards,
Nick

[GouShou]

Yeah, you are right, I didn't think about that.

So I'll stick to the EQU version. :)