那位大哥帮忙注释一段代码 c++的

#include <windows.h>
#include <stdio.h>

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

int WINAPI WinMain(
  HINSTANCE hInstance,
  HINSTANCE hPrevInstance,
  LPSTR lpCmdLine,
  int nCmdShow
)
{
   WNDCLASS wndclass;
   wndclass.cbClsExtra =0;
   wndclass.cbWndExtra =0;
   wndclass.hbrBackground =(HBRUSH)GetStockObject(BLACK_BRUSH);
   wndclass.hCursor =LoadCursor(NULL,IDC_CROSS);
   wndclass.hIcon=LoadIcon(NULL,IDI_ERROR);
   wndclass.hInstance =hInstance;
   wndclass.lpfnWndProc =WinSunProc;
   wndclass.lpszClassName= "风。。";
   wndclass.lpszMenuName =NULL;
   wndclass.style =CS_HREDRAW | CS_VREDRAW;
   RegisterClass(&wndclass);

   HWND hwnd;
   hwnd=CreateWindow("风。。","习题一。。",WS_OVERLAPPEDWINDOW,
    0,0,600,400,NULL,NULL,hInstance,NULL);

   ShowWindow(hwnd,SW_SHOWNORMAL);
   UpdateWindow(hwnd);

   MSG msg;
   while(GetMessage(&msg,NULL,0,0))
   {
     TranslateMessage(&msg);
  DispatchMessage(&msg);
   }
   return 0;
}
LRESULT CALLBACK WinSunProc(
  HWND hwnd,
  UINT uMsg,
  WPARAM wParam,
  LPARAM lParam
 )
{
 switch(uMsg)
 {
 case WM_CHAR:
  char szChar[20];
  sprintf(szChar,"char is %d",wParam);
  MessageBox(hwnd,szChar,"风。。",0);
  break;
 case WM_LBUTTONDOWN:
  MessageBox(hwnd,"mouse clicked","风。。",0);
  HDC hdc;
  hdc=GetDC(hwnd);
  TextOut(hdc,0,50,"第二次输出",strlen("第二次输出"));
  ReleaseDC(hwnd,hdc);
  break;
 case WM_PAINT:
  HDC hDC;
  PAINTSTRUCT ps;
  hDC=BeginPaint(hwnd,&ps);
     TextOut(hDC,0,0,"第三次输出",strlen("第三次输出"));
  EndPaint(hwnd,&ps);
  break;
 case WM_CLOSE:
  if(IDYES==MessageBox(hwnd,"是否真的结束？","风。。",MB_YESNO))
  {
    DestroyWindow(hwnd);
  }
  break;
 case WM_DESTROY:
  PostQuitMessage(0);
  break;
 default:
  return DefWindowProc(hwnd,uMsg,wParam,lParam);
 }
 return 0;
}

追问：能帮我再把那些函数在说明一下吗
还有 
int WINAPI WinMain(//windows main，类似于C语言程序的main主函数
  HINSTANCE hInstance, 
  HINSTANCE hPrevInstance, 
  LPSTR lpCmdLine, 
  int nCmdShow
)
里面的参数说明一下吗 主要的用途

答案：
#include <windows.h>//windows标准定义头文件
#include <stdio.h>//标准i/o函数库
LRESULT CALLBACK WinSunProc(   //"调用返回"结构
  HWND hwnd,//窗口句柄
  UINT uMsg,//消息标识符
      WPARAM wParam,//第一个消息参数
  LPARAM lParam //第二个消息参数
);
int WINAPI WinMain(//windows main，类似于C语言程序的main主函数
  HINSTANCE hInstance, 
  HINSTANCE hPrevInstance, 
  LPSTR lpCmdLine, 
  int nCmdShow
)
//以下是关于windows窗口属性的描述
{  WNDCLASS wndclass;//声明窗口类wndclass
   wndclass.cbClsExtra =0;
   wndclass.cbWndExtra =0;
   wndclass.hbrBackground =(HBRUSH)GetStockObject(BLACK_BRUSH);
   wndclass.hCursor =LoadCursor(NULL,IDC_CROSS);
   wndclass.hIcon=LoadIcon(NULL,IDI_ERROR);
   wndclass.hInstance =hInstance;
   wndclass.lpfnWndProc =WinSunProc;
   wndclass.lpszClassName= "风。。";
   wndclass.lpszMenuName =NULL;
   wndclass.style =CS_HREDRAW | CS_VREDRAW;
   RegisterClass(&wndclass); //注册窗口类 wndclass   
   HWND hwnd;//操作句柄
   hwnd=CreateWindow("风。。","习题一。。",WS_OVERLAPPEDWINDOW,
    0,0,600,400,NULL,NULL,hInstance,NULL);//创建指定的窗口（实体），此时还未显示该窗口
   ShowWindow(hwnd,SW_SHOWNORMAL);//以一般（normal）方式显示hwnd所指向的窗口
   UpdateWindow(hwnd);//更新窗口
   MSG msg;//声明一个消息结构msg
   while(GetMessage(&msg,NULL,0,0)) //循环获得系统发给自己想要的消息
   {
     TranslateMessage(&msg);//翻译当前消息
  DispatchMessage(&msg);//分发当前消息
   }
   return 0;//正常返回
}
LRESULT CALLBACK WinSunProc( //消息处理函数
  HWND hwnd,
  UINT uMsg,
  WPARAM wParam,
  LPARAM lParam
 )
{
 switch(uMsg) //根据参数uMsg的值（即消息类型）进行相应的操作
 {
 case WM_CHAR:
  char szChar[20];
  sprintf(szChar,"char is %d",wParam);
  MessageBox(hwnd,szChar,"风。。",0);
  break;
 case WM_LBUTTONDOWN:
  MessageBox(hwnd,"mouse clicked","风。。",0);
  HDC hdc;
  hdc=GetDC(hwnd);
  TextOut(hdc,0,50,"第二次输出",strlen("第二次输出"));
  ReleaseDC(hwnd,hdc);
  break;
 case WM_PAINT:
  HDC hDC;
  PAINTSTRUCT ps;
  hDC=BeginPaint(hwnd,&ps);
     TextOut(hDC,0,0,"第三次输出",strlen("第三次输出"));
  EndPaint(hwnd,&ps);
  break;
 case WM_CLOSE://当获得关闭消息时做以下操作
  if(IDYES==MessageBox(hwnd,"是否真的结束？","风。。",MB_YESNO))//显示一个消息窗口，并把返回值跟IDYES比较
  {
    DestroyWindow(hwnd);//比较得知用户选择:"是（yes）",摧毁窗口wndclass
  }
  break;
 case WM_DESTROY:
  PostQuitMessage(0);//当收到摧毁消息时，发送退出消息给操作系统
  break;
 default:
  return DefWindowProc(hwnd,uMsg,wParam,lParam);//执行默认的相关处理函数，并返回它的返回值
 }
 return 0;
}

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