[原创]一个问题.

永不后悔

我是一名初学vc++的学生.
这里有一个问题我弄不明白.
我该怎样调试这个程序.
#include
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInst,LPSTR lpszCmdLine,int nCmdShow)
{HWND hwnd;
MSG Msg;
WNDCLASS wndclass;
char lpszClassName[]="窗口";
char lpszTitle[]="my-windows";
wndclass.style=0;
wndclass.lpfnWndProc=WndProc;
wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hInstance=hInstance;
wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);

wndclass.lpszMenuName=NULL;
wndclass.lpszClassName=lpszClassName;
if(!RegisterClass(&wndclass))
{MessageBeep(0);
return FALSE;

}
hwnd=CreateWindow(lpszClassName,lpszTitle,WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&Msg,NULL,0,0))
{ TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,LPARAM lParam)
{switch(message)
{case WM_DESTROY:
PostQuitMessage(0);
default:
return DefWindowProc(hwnd,message,5,lParam);

}
return (0);
}
这是错误信息.
Linking...
ji.obj : error LNK2001: unresolved external symbol "long __stdcall WndProc(struct HWND__ *,unsigned int,unsigned int,long)" (?WndProc@@YGJPAUHWND__@@IIJ@Z)
LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/ji.exe : fatal error LNK1120: 2 unresolved externals
Error executing link.exe.

ji.exe - 3 error(s), 0 warning(s)

鸡总

想用API编程，建议买套《Windows程序设计（第5版）》。不过，买了4年了，我到现在也没有看完！编程太无趣了！