初学VC 请教啊

我想创建一个主窗口及其子窗口，我这样写了代码，为什么不行 啊？谢谢#include<windows.h>
#include<stdio.h>
LRESULT CALLBACK WinProc(HWND h1,UINT msg,WPARAM wParam,LPARAM lParam);int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
   WNDCLASS w;
   w.cbClsExtra=0;
   w.cbWndExtra=0;
   w.hbrBackground=(HBRUSH)::GetStockObject(DKGRAY_BRUSH);
   w.hCursor=::LoadCursor(NULL,IDC_UPARROW);
   w.hIcon=::LoadIcon(NULL,IDI_EXCLAMATION);
   w.hInstance=hInstance;
   w.lpfnWndProc=WinProc;
   w.lpszClassName="窗口";
   w.lpszMenuName=NULL;
   w.style=CS_HREDRAW|CS_VREDRAW;
      ::RegisterClass(&w);   HWND h1,h2;
   h1=::CreateWindow("窗口","1",WS_OVERLAPPEDWINDOW,0,0,400,400,NULL,NULL,hInstance,NULL);
   h2=::CreateWindow("窗口","2",WS_CHILD,400,400,600,600,NULL,NULL,hInstance,NULL);   ShowWindow(h1,nCmdShow);
   
   UpdateWindow(h1);
   ShowWindow(h2,nCmdShow);
   UpdateWindow(h2);
   MSG msg;
   while(::GetMessage(&msg,NULL,0,0))
   {
   ::TranslateMessage(&msg);
   ::DispatchMessage(&msg);
   }   return msg.wParam;
}
LRESULT CALLBACK WinProc(HWND h1,UINT msg,WPARAM wParam,LPARAM lParam){
switch(msg)
{
case WM_CLOSE:

::DestroyWindow(h1);

break; case WM_DESTROY:
::PostQuitMessage(0);
break; default:
return DefWindowProc(h1,msg,wParam,lParam);
}
return 0;
}