C++创建窗口

#include <Windows.h>  //windows窗口标准库函数
#include <stdio.h>	  //c语言需要的库函数

LRESULT CALLBACK WindowProc(//窗口过程函数原型
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);
int WINAPI WinMain(//窗口主函数，相当于 DOS下的main函数
  HINSTANCE hInstance,  // handle to current instance
  HINSTANCE hPrevInstance,  // handle to previous instance
  LPSTR lpCmdLine,      // pointer to command line
  int nCmdShow          // show state of window
  )
{
	  WNDCLASS wcs;
	  wcs.cbClsExtra=0;	//窗口类附加参数
	  wcs.cbWndExtra=0; //窗口附加参数
	  wcs.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);//窗口ＤＣ背景
	  wcs.hCursor=LoadCursor(hInstance,IDC_CROSS); //鼠标样式
	  wcs.hIcon=LoadIcon(NULL,IDI_ERROR);//窗口icon
	  wcs.hInstance=hInstance;//应用程序实例
	  wcs.lpfnWndProc=WindowProc; 
	  wcs.lpszClassName="练习窗口";	
	  wcs.lpszMenuName=NULL;  
	  wcs.style=CS_VREDRAW|CS_HREDRAW;
	  RegisterClass(&wcs); 
	  HWND hWnd; 
	  hWnd=CreateWindow("练习窗口","练习窗口",WS_OVERLAPPEDWINDOW,0,0,600,600,NULL,NULL,hInstance,NULL);
	  ShowWindow(hWnd,nCmdShow);	
	  UpdateWindow(hWnd);  
	  MSG msg;				 
	  //消息循环
	  while(GetMessage(&msg,0,NULL,NULL))
	  {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	  }
	  return 0;
}
LRESULT CALLBACK WindowProc( 
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
  )
{
	switch(uMsg)
	{
	case WM_CLOSE:
		DestroyWindow(hwnd);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:   
		return DefWindowProc(hwnd,uMsg,wParam,lParam);
		break;
	}
	return 0;
}