例子:
下例中，我们演示了当用户选择"file->open"时，将弹出一个打开文件对话框，当用户选择了某个文件打开时，会弹出一个对话框，告知要打开的文件的全路径名，文件名和文件扩展名。.386
.model flat,stdcall
option casemap:none
winmain proto :dword,:dword,:dword,:dword
include \masm32\include\windows.inc
include \masm32\include\user32.inc
include \masm32\include\kernel32.inc
include \masm32\include\comdlg32.inc
includelib \masm32\lib\user32.lib
includelib \masm32\lib\kernel32.lib
includelib \masm32\lib\comdlg32.lib
.const
idm_open equ 1
idm_exit equ 2
maxsize equ 260
outputsize equ 512
.data
classname db "simplewinclass",0
appname db "our main window",0
menuname db "firstmenu",0
ofn openfilename <>
filterstring db "all files",0,"*.*",0
db "text files",0,"*.txt",0,0
buffer db maxsize dup(0)
ourtitle db "-=our first open file dialog box=-: choose the file to open",0
fullpathname db "the full filename with path is: ",0
fullname db "the filename is: ",0
extensionname db "the extension is: ",0
outputstring db outputsize dup(0)
crlf db 0dh,0ah,0
.data?
hinstance hinstance ?
commandline lpstr ?
.code
start:
invoke getmodulehandle, null
mov hinstance,eax
invoke getcommandline
mov commandline,eax
invoke winmain, hinstance,null,commandline, sw_showdefault
invoke exitprocess,eax
winmain proc hinst:hinstance,hprevinst:hinstance,cmdline:lpstr,cmdshow:dword
local wc:wndclassex
local msg:msg
local hwnd:hwnd
mov wc.cbsize,sizeof wndclassex
mov wc.style, cs_hredraw or cs_vredraw
mov wc.lpfnwndproc, offset wndproc
mov wc.cbclsextra,null
mov wc.cbwndextra,null
push hinst
pop wc.hinstance
mov wc.hbrbackground,color_window+1
mov wc.lpszmenuname,offset menuname
mov wc.lpszclassname,offset classname
invoke loadicon,null,idi_application
mov wc.hicon,eax
mov wc.hiconsm,eax
invoke loadcursor,null,idc_arrow
mov wc.hcursor,eax
invoke registerclassex, addr wc
invoke createwindowex,ws_ex_clientedge,addr classname,addr appname,\
ws_overlappedwindow,cw_usedefault,\
cw_usedefault,300,200,null,null,\
hinst,null
mov hwnd,eax
invoke showwindow, hwnd,sw_shownormal
invoke updatewindow, hwnd
.while true
invoke getmessage, addr msg,null,0,0
.break .if (!eax)
invoke translatemessage, addr msg
invoke dispatchmessage, addr msg
.endw
mov eax,msg.wparam
ret
winmain endp
wndproc proc hwnd:hwnd, umsg:uint, wparam:wparam, lparam:lparam
.if umsg==wm_destroy
invoke postquitmessage,null
.elseif umsg==wm_command
mov eax,wparam
.if ax==idm_open
mov ofn.lstructsize,sizeof ofn
push hwnd
