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看看这代码怎样改

#include <windows.h>
#include <stdio.h>

LRESULT CALLBACK WinSunProc
(
   HWND hwnd,
   UINT uMsg,
   WPARAM wParam,
   LPARAM lParam
);

int WINAPI WinMain
(
  HINSTANCE hInstance,
  HINSTANCE hPrevInstance,
  LPSTR lpCmdLine,
  int nCmdShow
)
{
    WNDCLASS wndcls;

    wndcls.cbClsExtra=0;
    wndcls.cbWndExtra=0;
    wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
    wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);
    wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);
    wndcls.hInstance=hInstance;
    wndcls.lpfnWndProc=WinSunProc;
    wndcls.lpszClassName="Weixin2003";
    wndcls.lpszMenuName=NULL;
    wndcls.style=CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&wndcls);

    HWND hwnd;
    hwnd=CreateWindow("Weixin2003","北京维新科学技术中心",WS_OVERLAPPEDWINDOW,
        0,0,600,400,NULL,NULL,hInstance,NULL);

    ShowWindow(hwnd,SW_SHOWNORMAL);
    UpdateWindow(hwnd);

    MSG msg;
    while (GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}

LRESULT CALLBACK WindowProc
(
     HWND hwnd,
     UINT uMsg,
     WPARAM wParam,
     LPARAM lParam
)
{
    switch(uMsg)
    {
    case WM_CHAR:
        char szChar[20];
        sprintf(szChar,"char is %d",wParam);
        MessageBox(hwnd,szChar,"weixin",0);
        break;
    case WM_LBUTTONDOWN:
        MessageBox(hwnd,"mouse clicked","weixin",0);
        HDC hdc;
        hdc=GetDC(hwnd);
        TextOut(hdc,0,50,"计算机编程",strlen("计算机编程"));
        ReleaseDC(hwnd,hdc);
        break;
    case WM_PAINT:
        HDC hDC;
        PAINTSTRUCT ps;
        hDC=BeginPaint(hwnd,&ps);
        TextOut(hDC,0,0,"计算机",strlen("计算机"));
        EndPaint(hwnd,&ps);
        break;
    case WM_CLOSE:
        if(IDYES==MessageBox(hwnd,"是否真的要结束","weixin",MB_YESNO))
        {
            DestroyWindow(hwnd);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd,uMsg,wParam,lParam);
    }
    return 0;
}
--------------------Configuration: 2 - Win32 Debug--------------------
Compiling...
2.cpp
Linking...
2.obj : error LNK2001: unresolved external symbol "long __stdcall WinSunProc(struct HWND__ *,unsigned int,unsigned int,long)" (?WinSunProc@@YGJPAUHWND__@@IIJ@Z)
Debug/2.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

2.exe - 2 error(s), 0 warning(s)
不知道是哪里错了，和书上一个一个字的对，没有错，帮忙看下，谢谢！

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#include <windows.h> #include <stdio.h> LRESULT CALLBACK WindowProc //这里错了,我也改了,只是你把WindowProc写错了 ( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam ); int WINAPI WinMain ( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow ) { WNDCLASS wndcls; wndcls.cbClsExtra=0; wndcls.cbWndExtra=0; wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH); wndcls.hCursor=LoadCursor(NULL,IDC_CROSS); wndcls.hIcon=LoadIcon(NULL,IDI_ERROR); wndcls.hInstance=hInstance; wndcls.lpfnWndProc=WindowProc; //这里错了,我帮你改了 wndcls.lpszClassName="Weixin2003"; wndcls.lpszMenuName=NULL; wndcls.style=CS_HREDRAW | CS_VREDRAW; RegisterClass(&wndcls); HWND hwnd; hwnd=CreateWindow("Weixin2003","北京维新科学技术中心",WS_OVERLAPPEDWINDOW, 0,0,600,400,NULL,NULL,hInstance,NULL); ShowWindow(hwnd,SW_SHOWNORMAL); UpdateWindow(hwnd); MSG msg; while (GetMessage(&msg,NULL,0,0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return 0; } LRESULT CALLBACK WindowProc ( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam ) { switch(uMsg) { case WM_CHAR: char szChar[20]; sprintf(szChar,"char is %d",wParam); MessageBox(hwnd,szChar,"weixin",0); break; case WM_LBUTTONDOWN: MessageBox(hwnd,"mouse clicked","weixin",0); HDC hdc; hdc=GetDC(hwnd); TextOut(hdc,0,50,"计算机编程",strlen("计算机编程")); ReleaseDC(hwnd,hdc); break; case WM_PAINT: HDC hDC; PAINTSTRUCT ps; hDC=BeginPaint(hwnd,&ps); TextOut(hDC,0,0,"计算机",strlen("计算机")); EndPaint(hwnd,&ps); break; case WM_CLOSE: if(IDYES==MessageBox(hwnd,"是否真的要结束","weixin",MB_YESNO)) { DestroyWindow(hwnd); } break; case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hwnd,uMsg,wParam,lParam); } return 0; }