Please help and teach me :)

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mastek

Joined: 29 Jun 2006
Posts: 17

mastek 08 Apr 2015, 09:06

Hello. I am new and beginner about assembler. I choose fasm because it is updating always.

I have C code simple program (source below). But I could not convert fasm code. Can you help me ?

I want to convert fasm 32 bit dos (I love DOS Smile

and Win 32 Window application

Would you tech me ?

best regards

C code :

#include <stdio.h>

int main

{
printf(" Hello World 1 \n");
printf(" Hello World 2 \n");
printf(" Hello World 3 \n");

return 0;
}

08 Apr 2015, 09:06

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20461
Location: In your JS exploiting you and your system

revolution 08 Apr 2015, 09:08

The "hello World" source codes for various systems are already included in the fasm download. See the folder named "examples".

08 Apr 2015, 09:08

CandyMan

Joined: 04 Sep 2009
Posts: 414
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop

CandyMan 08 Apr 2015, 15:16

the simplest examples

Code:

        org     100h

        mov     bx,Hello
        call    PrintStr
        mov     byte [bx+12],'2'
        call    PrintStr
        mov     byte [bx+12],'3'
PrintStr:
        mov     ah,9
        mov     dx,bx
        int     21h
        ret

Hello   db      'Hello World 1',13,10,36

Code:

        org     100h

        call    PrintStr
        call    PrintInc
PrintInc:
        inc     byte [Hello+12]
PrintStr:
        mov     ah,9
        mov     dx,Hello
        int     21h
        ret

Hello   db      'Hello World 1',13,10,36

Code:

        org     100h

        mov     cx,3
      @@:
        mov     ah,9
        mov     dx,Hello
        int     21h
        inc     [Hello+12]
        loop    @B
        ret

Hello   db      'Hello World 1',13,10,36

_________________
smaller is better

08 Apr 2015, 15:16

mastek

Joined: 29 Jun 2006
Posts: 17

mastek 08 Apr 2015, 20:17

CandyMan wrote:

the simplest examples

Code:

        org     100h

        mov     bx,Hello
        call    PrintStr
        mov     byte [bx+12],'2'
        call    PrintStr
        mov     byte [bx+12],'3'
PrintStr:
        mov     ah,9
        mov     dx,bx
        int     21h
        ret

Hello   db      'Hello World 1',13,10,36

Code:

        org     100h

        call    PrintStr
        call    PrintInc
PrintInc:
        inc     byte [Hello+12]
PrintStr:
        mov     ah,9
        mov     dx,Hello
        int     21h
        ret

Hello   db      'Hello World 1',13,10,36

Code:

        org     100h

        mov     cx,3
      @@:
        mov     ah,9
        mov     dx,Hello
        int     21h
        inc     [Hello+12]
        loop    @B
        ret

Hello   db      'Hello World 1',13,10,36

@CandyMan

thank you soo much. Can you show me 32 bit unreal mode and win32 window versions?

08 Apr 2015, 20:17

CandyMan

Joined: 04 Sep 2009
Posts: 414
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop

CandyMan 09 Apr 2015, 12:53

in 32-bit unreal mode sample is the same as real mode
see also:
http://board.flatassembler.net/topic.php?p=134745#134745
http://board.flatassembler.net/topic.php?p=145936#145936
http://board.flatassembler.net/topic.php?p=104631#104631

_________________
smaller is better

Last edited by CandyMan on 14 Apr 2015, 17:48; edited 1 time in total

09 Apr 2015, 12:53

mastek

Joined: 29 Jun 2006
Posts: 17

mastek 10 Apr 2015, 12:50

CandyMan wrote:

in 32-bit unreal mode sample is the same as real mode
see also:
http://board.flatassembler.net/topic.php?p=134745#134745
http://board.flatassembler.net/topic.php?p=145936#145936
http://board.flatassembler.net/topic.php?p=104631#104631

Thank you candyman.

Time to work for me Smile

10 Apr 2015, 12:50

El Tangas

Joined: 11 Oct 2003
Posts: 120
Location: Sunset Empire

El Tangas 24 May 2015, 23:05

Here is an example for windows command line:

Code:

format PE console  ;this is a command line program

include 'win32ax.inc'  ;load standard fasm macros for windows


define  \n 13,10  ;define newline as convenience for C programmers 

.code
start:
        invoke  GetStdHandle,STD_OUTPUT_HANDLE    ;windows funtion that returns handle to STDOUT
        mov     [handle],eax                      ;save handle
        invoke  WriteFile,[handle],string1,str_len1,n_written,0   ;this windows functtion is similar to C "fwrite"
        invoke  WriteFile,[handle],string2,str_len2,n_written,0   ;since we are not using printf formating anyway
        invoke  WriteFile,[handle],string3,str_len3,n_written,0   ;there is a wsprintf function in windows if you really need it

        mov     eax,0   ;these 2 lines are C "return 0;"
        ret

.data

string1 db "Hello, World!!! 1",\n
str_len1 = $-string1   ;to calculate the lenght of the string

string2 db "Hello, World!!! 2",\n
str_len2 = $-string2

string3 db "Hello, World!!! 3",\n
str_len3 = $-string3

n_written dd 0   ;we don't use this variable, but WriteFile requires it...
handle dd 0

.end start      ;.end is a very convenient standard fasm macro

To get details on windows functions, you can check msdn. I used 3 strings instead of a dynamically modifying string like CandyMan did, for clearness. So, you can try to write the windows version of the modifying code as exercise Smile

BTW, I notice you registered here in 2006 Shocked

lol, you post even less than me Laughing

24 May 2015, 23:05

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