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Index > Windows > [Solved]What's wrong with my code ?

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lacamoura



Joined: 12 Dec 2014
Posts: 5
lacamoura
Hello,

I'm new to assembler, and decided to use FASM

ok, my first application in FASM was to try if conditional

Code:
include 'win32ax.inc'

.data
    handle db ?

.code

Start:
        invoke  MessageBox, 0, "Are you over 18 ?", "SimpleApp", MB_YESNO
        mov [handle], al
        if handle = IDYES
                invoke  MessageBox, 0, "You are an adult Smile", "SimpleApp", MB_OK
        end if
    
        invoke  ExitProcess, 0
.end Start
    


if I press Yes or No, I don't get the second MessageBox

did I miss something ?

thanks in advance


Last edited by lacamoura on 12 Dec 2014, 20:53; edited 1 time in total
Post 12 Dec 2014, 18:46
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sleepsleep



Joined: 05 Oct 2006
Posts: 9187
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sleepsleep
if [handle]
maybe?
Post 12 Dec 2014, 19:13
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lacamoura



Joined: 12 Dec 2014
Posts: 5
lacamoura
I get
Code:
flat assembler  version 1.71.22  (869198 kilobytes memory)
HELLO.asm [11]:
    if [handle] = IDYES
[b]error: invalid value.[/b]
    
Post 12 Dec 2014, 19:18
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sleepsleep



Joined: 05 Oct 2006
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sleepsleep
ah, so sorry, not much idea,
maybe is AH?
i guess maybe you are correct with if handle = IDYES,
Post 12 Dec 2014, 19:35
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lacamoura



Joined: 12 Dec 2014
Posts: 5
lacamoura
sleepsleep wrote:

maybe is AH?


I'm new to assemby, yes. but I know that AL is the least-significant byte, and the AH is the most-significant byte in AX
Confused

and i tried with
Code:
.data
    handle dd ?
    

and
Code:
mov [handle], eax
    


still doesn't work Confused
Post 12 Dec 2014, 19:51
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randomdude



Joined: 01 Jun 2012
Posts: 83
randomdude
i think 'if' checks it at compile time, try with '.if'

.if byte[handle] = IDYES
invoke MessageBox, 0, "You are an adult Smile", "SimpleApp", MB_OK
.endif
Post 12 Dec 2014, 20:22
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lacamoura



Joined: 12 Dec 2014
Posts: 5
lacamoura
randomdude wrote:
i think 'if' checks it at compile time, try with '.if'

.if byte[handle] = IDYES
invoke MessageBox, 0, "You are an adult Smile", "SimpleApp", MB_OK
.endif


thanks randomdude, you're right about compile time

but FASM gave a lot of errors when I tried .if .... .endif

so tried low level comparaison, and it works

Code:
include 'win32ax.inc'

.data
    handle db ?

.code

Start:
        invoke  MessageBox, 0, "Are you over 18 ?", "SimpleApp", MB_YESNO
    mov [handle], al
    ;if handle = IDYES
    cmp [handle], IDYES
    jne .ExitApp
    invoke      MessageBox, 0, "You are an adult Smile", "SimpleApp", MB_OK
    ;end if
    .ExitApp:
        invoke  ExitProcess, 0
.end Start
    
Post 12 Dec 2014, 20:52
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tthsqe



Joined: 20 May 2009
Posts: 730
tthsqe
see http://board.flatassembler.net/topic.php?t=7217 for lots of uses of .if .else ect
Post 12 Dec 2014, 22:39
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lacamoura



Joined: 12 Dec 2014
Posts: 5
lacamoura
@tthsqe thanks dude
Post 14 Dec 2014, 17:14
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CampTheBoss



Joined: 02 Feb 2015
Posts: 42
Location: A chair
CampTheBoss
There is an easy way to do it. (it requires Win32ax)
Code:
invoke MessageBox,0,yourmsg,yourcaption,MB_YESNO
.if EAX = IDYES
jmp good
.endif
invoke ExitProcess,0

good:
invoke MessageBox,0,goodmsg,yourcaptopn,MB_OK
invoke ExitProcess,0    
[/code]
Post 02 Feb 2015, 20:32
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