ASM: Convert DWORD to string in Assembly using MSVCRT _ultoa

This post shows how to convert unsigned int (DWORD) to string using MSVCRT function _ultoa.

	.386
	.model flat, stdcall
	option casemap :none
	include \masm32\include\windows.inc
	include \masm32\include\masm32.inc
	include \masm32\include\kernel32.inc
	include \masm32\include\msvcrt.inc
	includelib \masm32\lib\kernel32.lib
	includelib \masm32\lib\masm32.lib
	includelib \masm32\lib\msvcrt.lib
	.data
	buffer DB 11 DUP(0)
	value DWORD 4294967295
	.code
	start:
	invoke crt__ultoa,value,ADDR buffer,10
	invoke StdOut, addr buffer
	invoke ExitProcess, 0
	end start

view raw int2string3.asm hosted with ❤ by GitHub

Pre-requisite:

• Install MASM

To assemble:

\masm32\bin\ml /c /Zd /coff int2string3.asm

To link:

\masm32\bin\Link /SUBSYSTEM:CONSOLE int2string3.obj

Keywords: Assembly, Win32