[Dev-C++] windows program error

this windows program isn't working. It says i have invalid conversions at 
the lines where there is a comment that says so.



#include <windows.h>

long FAR PASCAL _export 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 = SelectObject(hdc, hpen); //invalid conversion from void*
       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 PASCAL WinMain(HANDLE hInstance, HANDLE 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 = GetStockObject(WHITE_BRUSH); //invalid 
conversion from void*
            wndclass.lpszMenuName  = NULL;
            wndclass.lpszClassName = szAppName;

            RegisterClass(&wndclass);
        }

        hwnd = CreateWindow(szAppName,     //window class name
             "HELLO Program",              //windows caption
             WS_OVERLAPPEDWINDOW,          //window style
             CW_USEDEFAULT,                 //inital x position
             CW_USEDEFAULT,                 //inital y position
             CW_USEDEFAULT,                 //inital x size
             CW_USEDEFAULT,                 //inital y size
             NULL,                         //parent window handle
             NULL,                         //window menu handle
             hInstance,                    //program instance handle
             NULL);                        //creation paramaters   //invalid 
conversion from void

       ShowWindow(hwnd, nCmdShow);
       UpdateWindow(hwnd);

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

}

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