wndclass.hbrBackground=GetStockObject(WHITE_BRUSH); 这一句为什么出错？？ 解决了就给分

// this is my first windows application
//name: SimpleWindows
//-------------------
#include <windows.h>
LONG FAR PASCAL WindowFun(HWND,UINT,WPARAM,LPARAM);int WINAPI WinMain(HINSTANCE CurInstance,HINSTANCE PreInstance,LPSTR CmdParaStr,int ShowStyle )
{
static char ProgName[]="MyProg1_1";  // this is application name
HWND hwnd;  //this is windows's piont
MSG msg;                             //the message struct
WNDCLASS wndclass;                   //windows type
//register
//regist one time is ok
if(!PreInstance)
{
wndclass.lpszClassName =ProgName;
wndclass.hInstance = CurInstance;
wndclass.lpfnWndProc =WindowFun;
wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor =LoadCursor(NULL,IDC_IBEAM);
wndclass.lpszMenuName =NULL;
wndclass.hbrBackground=GetStockObject(WHITE_BRUSH);
wndclass.style =CS_HREDRAW|CS_VREDRAW;
wndclass.cbClsExtra =0;
wndclass.cbWndExtra =0;
RegisterClass(&wndclass);
}
//create the windows
hwnd=CreateWindow(ProgName,           //Need register windows class name
              ProgName,           //the window naem
  WS_OVERLAPPEDWINDOW,//the window style
  100,                //the x
  100,                // the y
  300,                // the x
  200,                //the y
  NULL,               //father windows handle
  NULL,               //menu handle
  CurInstance,        //this window's handle
  NULL);              //the param
//show windows
ShowWindow(hwnd,ShowStyle);
UpdateWindow(hwnd);
//message
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam ;
}//-----------------------
//windows process funcation
//-----------------------
long FAR PASCAL WindowFun(HWND hwnd,
  UINT message,
  WPARAM wParam,
  LPARAM lParam)
{
switch(message)
{
case WM_DESTROY:  //Close windows
PostQuitMessage(0);
return (0);
case WM_PAINT:  //ONPAINT
HDC hDC;
PAINTSTRUCT paintStruct;
hDC=BeginPaint(hwnd,&paintStruct);
EndPaint(hwnd,&paintStruct);
return (0);
default:  //other 
return DefWindowProc(hwnd,message,wParam,lParam);
}
}//=====================================
错误信息如下：
Compiling...
SimpleWindows.cpp
E:\WebTest\VCStudy\SimpleWindows\SimpleWindows.cpp(25) : error C2440: '=' : cannot convert from 'void *' to 'struct HBRUSH__ *'
        Conversion from 'void*' to pointer to non-'void' requires an explicit cast
Error executing cl.exe.