Output a message to the console window, 32 bit.

• nasm -f win32 ConsoleMessage32.asm -o ConsoleMessage32.obj

• golink /entry:Start /console kernel32.dll user32.dll ConsoleMessage32.obj
• polink /ENTRY:Start /SUBSYSTEM:CONSOLE /LIBPATH:c:\lib32 kernel32.lib user32.lib ConsoleMessage32.obj

Open a console window, and run the executable.

The message length is calculated by subtracting the starting address of Message from the starting address of the line containing the $.

_WriteFile@20 was chosen Instead of _WriteConsoleA@20, as the output can be redirected to a file using > filename

                                                ; Console Message, 32 bit. V1.02
NULL              EQU 0                         ; Constants
STD_OUTPUT_HANDLE EQU -11

extern _GetStdHandle@4                          ; Import external symbols
extern _WriteFile@20                            ; Windows API functions, decorated
extern _ExitProcess@4

global Start                                    ; Export symbols. The entry point

section .data                                   ; Initialized data segment
 Message        db "Console Message 32", 0Dh, 0Ah
 MessageLength  EQU $-Message                   ; Address of this line ($) - address of Message

section .bss                                    ; Uninitialized data segment
 StandardHandle resd 1
 Written        resd 1

section .text                                   ; Code segment
Start:
 push  STD_OUTPUT_HANDLE
 call  _GetStdHandle@4
 mov   dword [StandardHandle], EAX

 push  NULL                                     ; 5th parameter
 push  Written                                  ; 4th parameter
 push  MessageLength                            ; 3rd parameter
 push  Message                                  ; 2nd parameter
 push  dword [StandardHandle]                   ; 1st parameter
 call  _WriteFile@20                            ; Output can be redirect to a file using >

 push  NULL
 call  _ExitProcess@4