下面的程序本是书上的原程序，我只是把它的结构改了一下，原程序是把_WinMain和_ProcWinMain这两个过程的定义放在前面，
而我就把它们的定义放在后面了，然后就在数据段前面加了下面两条语句：
_WinMain                proto
_ProcWinMain        proto    hWnd:DWORD ,uMsg:DWORD ,wParam:DWORD ,lParam:DWORD
可链接时就出错了，我实在不知问题出在哪了，哪位高手帮我指正一下

.386
.model flat,stdcall
option casemap:none

;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
;Include 文件定义
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Include        windows.inc
Include         gdi32.inc
Includelib     gdi32.lib
Include         user32.inc
Includelib     user32.lib
Include         kernel32.inc
Includelib     kernel32.lib

_WinMain                proto
_ProcWinMain        proto    hWnd:DWORD ,uMsg:DWORD ,wParam:DWORD ,lParam:DWORD 

;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
;数据段
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
.data?
hInstance    DWORD ?
hWinMain        DWORD ?
.const
szClassName     BYTE  'MyClass',0
szCaptionMain    BYTE  'My first Window!',0
szText            BYTE  'I am coming! Win32!',0

;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
;代码段
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
.code
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
start:
    invoke _WinMain
    invoke ExitProcess,NULL
end start
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
_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 szCaptionMain,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
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
;窗口过程
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
_ProcWinMain        proc    uses ebx edi esi,hWnd,uMsg,wParam,lParam
                        local @stPs:PAINTSTRUCT
                        local @stRect:RECT
                        local    @hDc:DWORD
                        
                        mov    eax,uMsg
                        .if    eax==WM_PAINT
                                invoke     BeginPaint,hWnd,addr @stPs
                                mov         @hDc,eax
                                invoke    GetClientRect,hWnd,addr @stRect
                                invoke    DrawText,@hDc,addr szText,-1,addr @stRect,DT_SINGLELINE or DT_CENTER or DT_VCENTER
                                invoke    EndPaint,hWnd,addr @stPs
                    .elseif     eax==WM_CLOSE
                                invoke    DestroyWindow,hWinMain
                                invoke    PostQuitMessage,NULL
                        .else    
                                invoke    DefWindowProc,hWnd,uMsg,wParam,lParam
                                ret
                        .endif
                        xor eax,eax
                        ret
_ProcWinMain        endp
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>