Windows编程的小问题！！（very easy!)

Question

书旧了，有些东西难免也会有些过时，不过我想不通怎么会还有一些拼写错误啊？
下面我改了一下，可以编译通过了：#include <windows.h>long FAR PASCAL WndProc(HWND hwnd,UINT message,UINT wParam,LONG lParam)
{
HDC hdc;
HPEN hpen ,hpenOld;
PAINTSTRUCT ps;
RECT rect; switch(message)
{
case WM_PAINT :
hdc=BeginPaint(hwnd,&ps);
GetClientRect(hwnd,&rect);
hpen=CreatePen(PS_SOLID ,6,RGB(0,0,255));
hpenOld=(HPEN)SelectObject(hdc,hpen);
Rectangle(hdc,rect.left+10,rect.top+10,rect.right-10,rect.bottom-10);
DrawText(hdc,"Hello,world!",-1,&rect,DT_SINGLELINE|DT_CENTER|DT_VCENTER);
SelectObject(hdc,hpenOld);
DeleteObject(hpen);
EndPaint(hwnd,&ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd,message,wParam,lParam);
}int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,
   LPSTR lpszCmdParam,int nCmdShow)
{
static char szAppName[]="Hello";
HWND hwnd;
MSG msg;
WNDCLASS wndclass; if(!hPrevInstance)
{
wndclass.style=CS_HREDRAW|CS_VREDRAW;
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.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName=NULL;
wndclass.lpszClassName=szAppName;
RegisterClass(&wndclass);
}
hwnd=CreateWindow(szAppName,"Hello Program",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;
}