masm32,API函数编程显示hello

masm32，API函数编程显示hello？

.686 .model flat,stdcall

option casemap:none

includelib \masm32\lib\kernel32.lib

includelib \masm32\lib\user32.lib

ExitProcess proto,:DWORD

MessageBoxA PROTO:DWORD,:DWORD,:DWORD,:DWORD

MessageBox equ <MessageBoxA>

NULL equ 0

MB_OK equ 0

.data

szCaption byte '消息窗口',0

outbuffer byte 'hello world!',12 dup (0),0

outbufsize = sizeof outbuffer-1

.code

start:

mov eax,0

invoke MessageBox,NULL,addr outbuffer,addr szCaption,MB_OK

invoke ExitProcess,NULL

end start