Thread: Windows NT?

I'm using the book "Programming Windows Fifth edition and it uses windows NT c++ windows language. How can i edit this code to make it run on windows XP.

Code:

#include <windows.h>
#include <math.h>

#define NUM 1000
#define TWOPI (2*3.14159)

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT("Sine Wave");
HWND         hwnd;
MSG          msg;
WNDCLASS     wndclass;

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 = (HBUSH) GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;

if(!RegisterClass(&wndclass))
{
MessageBox(NULL, TEXT("Program requires Windows NT!"),szAppName, MB_ICONERROR);
return 0;
}

hwnd = CreateWindow(szAppName, TEXT("Sine Wave Using Polyline"),
WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, CW_USEDEFAULT,CW_USEDEFAULT,
CW_USEDEFAULT, NULL, NULL,hInstance, NULL);

ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);

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

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int cxClient, cyClient;
HDC hdc;
int i;
PAINTSTRUCT ps;
POINT apt[NUM];

switch(message)
{
case WM_SIZE:
     cxClient = LOWORD(lParam);
     cyClient = HIWORD(lParam);
     return 0;
case WM_PAINT:
hdc= BeginPaint(hwnd,&ps);

MoveToEx(hdc, 0, cyClient / 2, NULL);
LineTo(hdc, cxClient, cyClient/2);

for(i=0;i<NUM;i++)
{
apt[i].x = i*cxClient/NUM;
apt[i].y = (int)(cyClient/2*(1-sin(TWOPI*i/NUM)));
}

PolyLine(hdc,apt,NUM);
return 0;

case WM_DESTROY:
     PostQuitMessage(0);
     return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}