[求救] windows api 创建程序调试 一直有错，急求帮助

我的程序如下：

# include<windows.h>

# include<stdio.h>







LRESULT CALLBACK WindowLiProc(WNDPROC lpPrevWndFunc,

    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_WINLOGO);

wndcls.hInstance=hInstance;

wndcls.lpfnWndProc=WindowLiProc;

wndcls.lpszClassName="CheersLi01";

wndcls.lpszMenuName=NULL;

wndcls.style=CS_HREDRAW	|	CS_VREDRAW;

RegisterClass(&wndcls);



HWND hwnd;

hwnd=CreateWindow("CheersLi01","Cheers Li Api 学习",WS_OVERLAPPEDWINDOW,0,0,800,600,NULL,NULL,hInstance,NULL);



ShowWindow(hwnd,SW_SHOWNORMAL);

UpdateWindow(hwnd);



MSG msg;



while(GetMessage(&msg,NULL,0,0))

	{

		TranslateMessage(&msg);

		DispatchMessage(&msg);

	}

return 0;



}







 WindowLiProc(WNDPROC lpPrevWndFunc,

    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,"CheersLi01",0);

		 break;

	 case WM_LBUTTONDOWN	:

		 MessageBox(hwnd,"mouse click","CheersLi01",0);

		 HDC hdc;

		 hdc=GetDC(hwnd);

		 TextOut(hdc,0,50,"我的C++学习",ARRAYSIZE("我的C++学习"));

		 ReleaseDC(hwnd,hdc);

	 case WM_PAINT	:

		 HDC hDc;

		 PAINTSTRUCT ps;

		 hDc=BeginPaint(hwnd,&ps);

		 TextOut(hDc,0,50,"C++ Programming",ARRAYSIZE("C++ Programming"));

		 EndPaint(hwnd,&ps);

		 break;

	 case WM_CLOSE	:

		 if(IDYES==MessageBox(hwnd,"是否真的结束？","Hints for you",0))

		 {

			 DestroyWindow(hwnd);

		 }

		 break;

	 case WM_DESTROY	:

		 PostQuitMessage(0);

		 break;

	 default:

		 return DefWindowProc(hwnd,uMsg,wParam,lParam);

	 }



 	 return 0;

 }

我在vs2008 下运行，找了半天还是调试有错误，希望大家帮我，我已经折腾的筋疲力尽了，提前谢过^_^


我编译一直报错如下：
1>------ 已启动生成: 项目: WinMain, 配置: Debug Win32 ------
1>正在编译...
1>WinMain.cpp
1>d:\c++\sunxin_practice\chapter01\winmain\winmain\winmain.cpp(26) : error C2440: “=”: 无法从“LRESULT (__stdcall *)(WNDPROC,HWND,UINT,WPARAM,LPARAM)”转换为“WNDPROC”
1> 该转换要求 reinterpret_cast、C 样式转换或函数类型转换
1>d:\c++\sunxin_practice\chapter01\winmain\winmain\winmain.cpp(56) : error C4430: 缺少类型说明符 - 假定为 int。注意: C++ 不支持默认 int
1>d:\c++\sunxin_practice\chapter01\winmain\winmain\winmain.cpp(56) : error C2556: “int WindowLiProc(WNDPROC,HWND,UINT,WPARAM,LPARAM)”: 重载函数与“LRESULT WindowLiProc(WNDPROC,HWND,UINT,WPARAM,LPARAM)”只是在返回类型上不同
1> d:\c++\sunxin_practice\chapter01\winmain\winmain\winmain.cpp(6) : 参见“WindowLiProc”的声明
1>d:\c++\sunxin_practice\chapter01\winmain\winmain\winmain.cpp(56) : error C2373: “WindowLiProc”: 重定义；不同的类型修饰符
1> d:\c++\sunxin_practice\chapter01\winmain\winmain\winmain.cpp(6) : 参见“WindowLiProc”的声明
1>生成日志保存在“file://d:\C++\sunxin_practice\chapter01\WinMain\WinMain\Debug\BuildLog.htm”
1>WinMain - 4 个错误，0 个警告
========== 生成: 成功 0 个，失败 1 个，最新 0 个，跳过 0 个 ==========