win32位汇编程序出错，望调试

                    .386
                    .model flat,stdcall
                    option casemap:none
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;  Include 文件定义
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include    windows.inc
include    gdi32.inc
includelib gdi32.lib
include    user32.inc
includelib user32.lib
include    kernel32.inc
includelib kernel32.lib
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;  数据段
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                           .data?
hInstance                  dd        ?
hWinMain                   dd        ?

                           .const
szClassName                db        "MyClass",0
szCaption                  db        "My first Window !",0
szText                     db        "Win32 Assembly, Simpel and powerful !",0
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;  代码段
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                           .code
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;  窗口过程
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_ProcWinMain                proc      hWnd,uMsg,wParam,lParam
                            local     @stPs:PAINTSTRUCT
                            local     @stRect:RECT
                            local     @hDc
                           
                            mov       eax,uMsg
;***********************************************************************************************
                           .if        eax == WM_PAINT
                                      invoke    BeginPaint,hWnd,addr @stPs
                                      mov       @hDc,eax
                                      invoke    GetClientRect,@hDc,addr @stRect
                                      invoke    DrawText,@hDc,offset szText,-1,addr @stRect,\
                                      DT_SINGLELINE or DT_CENTER or DT_VCENTER
                           
                                      invoke    EndPaint,hWnd,addr @stPs
;***********************************************************************************************
                           
                           .elseif    eax == WM_CLOSE
                                      invoke    DestroyWindow,hWnd
                                      invoke    PostQuitMessage,NULL
;************************************************************************************************

                           .else
                                      invoke     DefWindowProc,hWnd,uMsg,wParam,lParam
                                      ret
                           .endif
;*************************************************************************************************
                             xor      eax,eax
                             ret
                           
_ProcWinMain   endp
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_WinMain                    proc
                            local     @stWndClass:WNDCLASSEX
                            local     @stMsg:MSG
                           
                            invoke    GetModuleHandle,NULL
                            mov       hInstance,eax
                            invoke    RtlZeroMemory,addr @stWndClass,sizeof @stWndClass
;*************************************************************************************************
;  注册窗口类
;*************************************************************************************************
                            invoke    LoadCursor,0,IDC_ARROW
                            mov       @stWndClass.hCursor,eax
                            push      hInstance
                            pop       @stWndClass.hInstance
                            mov       @stWndClass.cbSize,sizeof WNDCLASSEX
                            mov       @stWndClass.style,CS_HREDRAW or CS_VREDRAW
                            mov       @stWndClass.lpfnWndProc, offset _ProcWinMain
                            mov       @stWndClass.hbrBackground,COLOR_WINDOW + 1
                            mov       @stWndClass.lpszClassName, offset szClassName
                            invoke    RegisterClassEx,addr @stWndClass
;*************************************************************************************************
;  建立并显示窗口
;*************************************************************************************************
                            invoke    CreateWindowEx, WS_EX_CLIENTEDGE, offset szClassName,\
                                                      offset szCaption,WS_OVERLAPPEDWINDOW,100,100,600,400,\
                                                      NULL,NULL,hInstance,NULL
                            mov       hWinMain,eax
                            invoke    ShowWindow,hWinMain,SW_SHOWNORMAL
                            invoke    UpdateWindow,hWinMain
;*************************************************************************************************
;  消息循环
;*************************************************************************************************
                            .while    TRUE
                                      invoke GetMessage,addr @stMsg,NULL,0,0
                                      .break .if eax == 0
                                      invoke TranslateMessage,addr @stMsg
                                      invoke DispatchMessage,addr @stMsg
                            .endw
                            ret
                           
_WinMain                              endp
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start:
                             call     _WinMain
                             invoke   ExitProcess,NULL
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                             end start