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flat assembler > Main > Invalid operands

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Mino



Joined: 14 Jan 2018
Posts: 142
Hello,
I don't understand the mistake I made. The compiler tells me "Error: invalid operands", but I don't really understand why... Maybe you already told me that, but then I've already forgotten (sorry if that's the case).
Without further delay, here is all my code (the names of the variables, parameters,... may seem "strange", this is not too much the problem here. I don't even think it's one of them:

Code:
format PE console
entry main
section '.idata' data readable import
include 'INCLUDE\win32a.inc'
library msvcrt, 'msvcrt.dll', \ 
        kernel32, 'kernel32.dll'
import kernel32, ExitProcess, 'ExitProcess'
import msvcrt, printf, 'printf'
section '.data' data readable writeable
wpostf.text db ?
wpostf.frmt db ?
wpostf_41 db "Hello", 0
wpostf_18467 db "%s", 0
section '.code' code executable
wpostf:
mov wpostf.text, eax
mov wpostf.frmt, ecx
cinvoke printf, wpostf.frmt, wpostf.text
ret
main:
push eax
mov eax, ecx
mov eax, wpostf_41
mov ecx, wpostf_18467
call wpostf
invoke ExitProcess, 0
    


Would you help me Very Happy ?
Thank you and have a nice day.

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The best way to predict the future is to invent it.
Post 03 Mar 2018, 00:29
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 15904
Location: SDSS J140821.67+025733.2
You need square brackets about memory operands that are targets or sources.
Code:
mov [wpostf.text], eax    
But also note that you only allocated one byte with db, yet you are trying to store 4 bytes with eax. Perhaps you should increase the storage size:
Code:
wpostf.text dd ?    
Also:
Code:
cinvoke printf, [wpostf.frmt], [wpostf.text]    
Post 03 Mar 2018, 04:48
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Mino



Joined: 14 Jan 2018
Posts: 142
Thank you:)
Your solution works well, was indeed the size (db) that was not enough.
Post 03 Mar 2018, 11:01
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