Hello Window

#include <windows.h>
#include <commdlg.h>

LRESULT CALLBACK WndProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow)
{
 //static CHOOSECOLOR cc;
 //static COLORREF crCustColors[16];

 //cc.lStructSize = sizeof(CHOOSECOLOR);
 //cc.hwndOwner = NULL;
 //cc.hInstance = NULL;
 //cc.rgbResult = RGB(0x80,0x80,0x80);
 //cc.lpCustColors = crCustColors;
 //cc.Flags = CC_RGBINIT | CC_FULLOPEN;
 //cc.lCustData = 0;
 //cc.lpfnHook = NULL;
 //cc.lpTemplateName = NULL;

 //return ChooseColor(&cc);

 

 //wchar_t b[4];
 //
 //lstrcpyW(b,L"oo");

 //MessageBoxW(NULL,b,L"caption",MB_OK);

 TCHAR szAppName[100] = "ChooseColor";
 
 HWND hWnd;
 WNDCLASS wndClass;
 MSG msg;

 wndClass.cbClsExtra = 0;
 wndClass.cbWndExtra = 0;
 wndClass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
 wndClass.hCursor  = LoadCursor(NULL,IDC_ARROW);
 wndClass.hIcon = NULL;
 wndClass.hInstance = hInstance;
 wndClass.lpfnWndProc = WndProc;
 wndClass.lpszClassName = szAppName;
 wndClass.lpszMenuName = NULL;
 wndClass.style = NULL;

 RegisterClass(&wndClass);

 hWnd = CreateWindow(szAppName,szAppName,WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,0,800,600,NULL,NULL,hInstance,NULL);

 ShowWindow(hWnd,iCmdShow);

 UpdateWindow(hWnd);

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

 return (int)msg.wParam;

}

LRESULT CALLBACK WndProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
 HDC hDC;
 PAINTSTRUCT ps;
 RECT rect;
 switch(uMsg)
 {
 case WM_CREATE:
  
  break;
 case WM_PAINT:
  
  hDC = BeginPaint(hWnd,&ps);

  GetClientRect(hWnd,&rect);
  DrawTextW(hDC,L"Hello Windows xp",-1,&rect,DT_SINGLELINE|DT_CENTER|DT_VCENTER);

  EndPaint(hWnd,&ps);

  break;
 case WM_DESTROY:
  PostQuitMessage(0);
  break;
  
 }
 return DefWindowProc(hWnd,uMsg,wParam,lParam);
}