2 replies to this topic

[untitled_1]

hey all, im trying to get user input in the form of like a stream of bytes from key board, im doing the following and its wrong

jmp main


input: resb 20


get_input:

         mov ah, 0ah ;user input function

         int 21h ;for user input

         ret


main:

         mov dx, input ;move address of input to dx where keyboard input will be returned

         call get_input

         int 20h ;return to dos

This code is not working, im using nasm, i want input to initialized to value input by user in keyboard

Edited by dargueta, 02 November 2010 - 01:28 PM.
Added code tags

[mebob]

How exactly is it not working?

[dargueta]

The buffer can't just be empty; you need a bit more information for the interrupt. The first byte of the buffer should be the length of the buffer not including the two info bytes; the second should be 0, and everything after that is your buffer in which the string will be stored. On a return the second byte of the buffer will contain a number indicating how many bytes were stored into the buffer.

In your case you want something like

input: resb 22

.

.

.


mov     ah, 0ah

mov     BYTE [input], 0x20

mov     BYTE [input + 1], 0x00

mov     dx, input

int     21h