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Index > Windows > program does nothing :(

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Paul6253



Joined: 19 Oct 2003
Posts: 31
Location: NY
Paul6253
ok here's the code--
I;m running this within winxp
the prog does wait for keypress,as expected ,but
doesnt print anything on screen!
???
Thanks for help Wink
Code:

 ;print string 3 times,silly thing


           lea  esi,[str1]
          ;could use loop but this gives more control,I think
           mov ecx,3
           begin:
                 dec ecx
                 js exit
                 call print
                 jmp begin




            exit:
                 ;wait for key press then exit
                  mov ah,01h
                  int 021h
                  int 020h



 print:

 @1:     mov byte dl,[esi] ; load byte at esi
         cmp dl,0          ;check for NULL
         je endp           ;if so return
         mov ah,02h        ;call DOS
         int 021h
         inc esi           ;point to next char
         jmp @1            ;load next char
         endp:  ret        ;end of string

         str1  db 'hello world!',13,10,0


    

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Post 07 Dec 2003, 17:40
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Tommy



Joined: 17 Jun 2003
Posts: 489
Location: Norway
Tommy
Use 16-bit registers (ax instead of eax etc.). Wink You can't use 32-bit registers!
Post 07 Dec 2003, 18:08
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JohnFound



Joined: 16 Jun 2003
Posts: 3500
Location: Bulgaria
JohnFound
Hi.
You missed "org $100" as first row.
And Tommy, you are wrong here. There is no problem with 32bit registers - the programm will work, but using 32bit registers here is meaningless.

Regards.
Post 07 Dec 2003, 18:13
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Tommy



Joined: 17 Jun 2003
Posts: 489
Location: Norway
Tommy
Embarassed Opps... My fault... Sorry, was too quick there.. Very Happy Thanks for correcting me John! Wink
Post 07 Dec 2003, 18:54
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Gomer73



Joined: 29 Nov 2003
Posts: 151
Gomer73
I did the org 100h thing and complied this as a com file.
Mine printed out one line.

To fix this, I put the lea esi,[str1] after the begin statement.

Worked in windows 2000 for me.
Post 07 Dec 2003, 18:55
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Paul6253



Joined: 19 Oct 2003
Posts: 31
Location: NY
Paul6253
yeah forgot that org100 bit!
also as Gomer73 pointed out ,have to put the lea inside begin label cuz
the print loop modifes esi! So on the next loop god only know whats at
esi...lol
thanks again

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Post 07 Dec 2003, 19:09
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