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大家帮忙看看运行没反映是怎么回事啊！

#include"windows.h"
extern char szTitle[];
extern char szWindowClass[];
ATOM InitApplication(HINSTANCE);
BOOL InitInstance(HINSTANCE,int);
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
int APIENTRY WinMain(HINSTANCE,HINSTANCE,LPSTR,int);
char szTitle[]="简单Hello程序";
char szWindowClass[]="W32";
char szMenuName[]="NULL";
int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
MSG msg;
InitApplication(hInstance);
if(!InitInstance(hInstance,nCmdShow)) return FALSE;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
ATOM InitApplication(HINSTANCE hInstance)
{
WNDCLASS wc;
wc.style=CS_HREDRAW|CS_VREDRAW;
wc.lpfnWndProc=(WNDPROC)WndProc;
wc.cbClsExtra=0;
wc.cbWndExtra=0;
wc.hInstance=hInstance;
wc.hCursor=LoadIcon(NULL,IDI_APPLICATION);
wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wc.lpszMenuName=szMenuName;
wc.lpszClassName=szWindowClass;
return RegisterClass(&wc);
}
BOOL InitInstance(HINSTANCE hInstance,int nCmdShow)
{
HWND hWnd;
hWnd=CreateWindow(
szWindowClass,
szTitle,
WS_OVERLAPPEDWINDOW|WS_VSCROLL|WS_HSCROLL,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL
);
if(!hWnd) return FALSE;
ShowWindow(hWnd,nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
LRESULT CALLBACK WndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
char szHello[]="Hello";
switch(message)
{
case WM_PAINT:
hdc=BeginPaint(hWnd,&ps);
TextOut(hdc,80,150,szHello,strlen(szHello));
EndPaint(hWnd,&ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd,message,wParam,lParam);
}
return 0;
}
以上是我照着书上抄上去的，可是编译，连接成功之后运行却没反映，大家帮个忙看看问题在那里啊！我是新手，调试也不是很懂！

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