这个Win32程序为什么没弹出窗口啊？
Win32汇编刚接触，感觉一开始好困难啊，下面的程序基本和书上的例子相同，怎么就没弹出窗口呢？纳闷啊麻烦哪位给看看
程序代码：.386
.model flat, stdcall
option casemap:none
_WinMain proto :DWORD, :DWORD, :DWORD, :DWORD
include windows.inc
include user32.inc
includelib user32.lib
include kernel32.inc
includelib kernel32.lib
include gdi32.inc
includelib gdi32.inc
.data
className BYTE "My class",0
TextString BYTE "I have paint teh text successfully!",0
classCaptin BYTE "This is captin.",0
.data?
hinstance DWORD ?
hWinMain DWORD ?
.code
start:
invoke GetModuleHandle,NULL
mov hinstance,eax
invoke _WinMain,hinstance,NULL,NULL,SW_NORMAL
invoke ExitProcess,0
_WinMain proc hInst:HINSTANCE, hPrevInst:HINSTANCE, CmdLine:LPSTR, CmdShow:DWORD
local ms:MSG
local wc:WNDCLASSEX
local hWnd:DWORD
;填充wc
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,NULL
mov wc.lpszClassName,OFFSET className
invoke LoadIcon,NULL,IDI_APPLICATION;加载窗口最左上方的图标，若第一个为NULL则加载Windows自定义的
mov wc.hIcon,eax
mov wc.hIconSm,eax
invoke LoadCursor,NULL,IDC_APPSTARTING
mov wc.hCursor,eax
;注册新窗口
invoke RegisterClassEx,addr wc
;创建窗口
invoke CreateWindowEx,WS_EX_CLIENTEDGE,addr className,addr classCaptin,WS_ACTIVECAPTION,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInst,NULL
mov hWnd,eax
;显示窗口
invoke ShowWindow,hWnd,SW_SHOWNORMAL
;更新窗口
invoke UpdateWindow,hWnd
;消息循环
.while TRUE
invoke GetMessage,addr ms,hWnd,0,0
;当检索到消息WM_QUIT时，GetMessage的返回值为0
.break .if(!eax)
invoke TranslateMessage,addr ms
invoke DispatchMessage,addr ms
.endw
ret
_WinMain endp
;窗口过程
WndProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM
local hdc:DWORD
local ps:PAINTSTRUCT
local rectage:RECT
mov eax,uMsg
.if eax==WM_DESTROY
invoke PostQuitMessage,0
.elseif eax==WM_PAINT
invoke BeginPaint,NULL,addr ps
mov hdc,eax
invoke GetClientRect,hWnd,addr rectage
invoke DrawText,hdc,addr TextString,-1,addr rectage,DT_SINGLELINE or DT_VCENTER or DT_CENTER
invoke EndPaint,hdc,addr ps
.else
invoke DefWindowProc,hWnd,WM_ACTIVATE,wParam,lParam
ret
.endif
xor eax,eax
ret
WndProc endp
end start
