Trying to understand how to work with files in assembly language(notepad++ editor)
0
I started learning assembly and now im trying to some stuff that i really cant handle. I have a number 'nr' in hex and i want to write his digits to a file 'test.txt' ,separated by a 'separator'. OllyDebuger didnt help me very much.It write some strange characters in that file.Please help me with some advice to refresh this code
segment data use32 class=data
filename db "test.txt", 0
acces_mode db "w", 0
nr dd 0ABCh
descriptor_file dd -1
separator db "/",0
digit dd "%d"
; our code starts here
segment code use32 class=code
start:
push dword acces_mode
push dword filename
call [fopen]
add esp, 4*2
mov [descriptor_file], eax
cmp eax, 0
je final
mov ecx,0
mov eax,[nr]
repetitive:
mov ebx,eax
and ebx,00000000000000000000000000001111b
mov [digit],ebx
push eax
push dword digit
push dword [descriptor_file]
call [fprintf]
add esp, 4*2
push dword separator
push dword [descriptor_file]
call [fprintf]
add esp, 4*2
pop eax
shr eax,4
mov ecx,eax
add ecx,1
loop repetitive
push dword [descriptor_file]
call [fclose]
add esp, 4
assembly
edited Dec 27 at 15:15
AS Mackay
1,9174816
asked Dec 27 at 14:00
Marmureanu Marius
1
New contributor
Marmureanu Marius is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
0
I started learning assembly and now im trying to some stuff that i really cant handle. I have a number 'nr' in hex and i want to write his digits to a file 'test.txt' ,separated by a 'separator'. OllyDebuger didnt help me very much.It write some strange characters in that file.Please help me with some advice to refresh this code
segment data use32 class=data
filename db "test.txt", 0
acces_mode db "w", 0
nr dd 0ABCh
descriptor_file dd -1
separator db "/",0
digit dd "%d"
; our code starts here
segment code use32 class=code
start:
push dword acces_mode
push dword filename
call [fopen]
add esp, 4*2
mov [descriptor_file], eax
cmp eax, 0
je final
mov ecx,0
mov eax,[nr]
repetitive:
mov ebx,eax
and ebx,00000000000000000000000000001111b
mov [digit],ebx
push eax
push dword digit
push dword [descriptor_file]
call [fprintf]
add esp, 4*2
push dword separator
push dword [descriptor_file]
call [fprintf]
add esp, 4*2
pop eax
shr eax,4
mov ecx,eax
add ecx,1
loop repetitive
push dword [descriptor_file]
call [fclose]
add esp, 4
assembly
edited Dec 27 at 15:15
AS Mackay
1,9174816
asked Dec 27 at 14:00
Marmureanu Marius
1
New contributor
Marmureanu Marius is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
mov [digit],ebxoverwrites the format string"%d".
– rkhb
Dec 27 at 16:17
add a comment |
0
0
0
I started learning assembly and now im trying to some stuff that i really cant handle. I have a number 'nr' in hex and i want to write his digits to a file 'test.txt' ,separated by a 'separator'. OllyDebuger didnt help me very much.It write some strange characters in that file.Please help me with some advice to refresh this code
segment data use32 class=data
filename db "test.txt", 0
acces_mode db "w", 0
nr dd 0ABCh
descriptor_file dd -1
separator db "/",0
digit dd "%d"
; our code starts here
segment code use32 class=code
start:
push dword acces_mode
push dword filename
call [fopen]
add esp, 4*2
mov [descriptor_file], eax
cmp eax, 0
je final
mov ecx,0
mov eax,[nr]
repetitive:
mov ebx,eax
and ebx,00000000000000000000000000001111b
mov [digit],ebx
push eax
push dword digit
push dword [descriptor_file]
call [fprintf]
add esp, 4*2
push dword separator
push dword [descriptor_file]
call [fprintf]
add esp, 4*2
pop eax
shr eax,4
mov ecx,eax
add ecx,1
loop repetitive
push dword [descriptor_file]
call [fclose]
add esp, 4
assembly
edited Dec 27 at 15:15
AS Mackay
1,9174816
asked Dec 27 at 14:00
Marmureanu Marius
1
New contributor
Marmureanu Marius is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I started learning assembly and now im trying to some stuff that i really cant handle. I have a number 'nr' in hex and i want to write his digits to a file 'test.txt' ,separated by a 'separator'. OllyDebuger didnt help me very much.It write some strange characters in that file.Please help me with some advice to refresh this code
segment data use32 class=data
filename db "test.txt", 0
acces_mode db "w", 0
nr dd 0ABCh
descriptor_file dd -1
separator db "/",0
digit dd "%d"
; our code starts here
segment code use32 class=code
start:
push dword acces_mode
push dword filename
call [fopen]
add esp, 4*2
mov [descriptor_file], eax
cmp eax, 0
je final
mov ecx,0
mov eax,[nr]
repetitive:
mov ebx,eax
and ebx,00000000000000000000000000001111b
mov [digit],ebx
push eax
push dword digit
push dword [descriptor_file]
call [fprintf]
add esp, 4*2
push dword separator
push dword [descriptor_file]
call [fprintf]
add esp, 4*2
pop eax
shr eax,4
mov ecx,eax
add ecx,1
loop repetitive
push dword [descriptor_file]
call [fclose]
add esp, 4
assembly
assembly
edited Dec 27 at 15:15
AS Mackay
1,9174816
asked Dec 27 at 14:00
Marmureanu Marius
1
New contributor
Marmureanu Marius is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited Dec 27 at 15:15
AS Mackay
1,9174816
asked Dec 27 at 14:00
Marmureanu Marius
1
New contributor
Marmureanu Marius is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited Dec 27 at 15:15
AS Mackay
1,9174816
edited Dec 27 at 15:15
AS Mackay
1,9174816
edited Dec 27 at 15:15
AS Mackay
1,9174816
1,9174816
asked Dec 27 at 14:00
Marmureanu Marius
1
New contributor
Marmureanu Marius is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Dec 27 at 14:00
Marmureanu Marius
1
asked Dec 27 at 14:00
Marmureanu Marius
1
1
New contributor
Marmureanu Marius is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Marmureanu Marius is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Marmureanu Marius is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
mov [digit],ebxoverwrites the format string"%d".
– rkhb
Dec 27 at 16:17
add a comment |
mov [digit],ebxoverwrites the format string"%d".
– rkhb
Dec 27 at 16:17
mov [digit],ebx overwrites the format string "%d".– rkhb
Dec 27 at 16:17
mov [digit],ebx overwrites the format string "%d".– rkhb
Dec 27 at 16:17
add a comment |
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mov [digit],ebxoverwrites the format string"%d".– rkhb
Dec 27 at 16:17