Delphi通过解析搜狐网页来获取天气的函数

{
  获取城市的天气
  //使用方法
  Edit1.text:=GetWeather('北京');

}

 1 function GetWeather(City: String): String;
 2 const
 3    sys01='<table border=0 cellpadding=0 cellspacing=0 width=186 bgcolor=#ffffff>';
 4    sys02='<img src="';
 5    sys03='" width=';
 6    sys04='<td class=blu01>';
 7    sys05='</td>';
 8 var
 9  tmpstr,str1:string;
  j:integer;
  vFileStream:TFileStream;
  http:tidhttp;
 begin
  http:=tidhttp.Create(nil); 
  tmpstr:=http.Get('http://weather.news.sohu.com/citymake.php?city='+City);
  j:=pos(sys01,tmpstr);
  tmpstr:=copy(tmpstr,j,length(tmpstr));
  j:=pos(sys02, tmpstr);
  tmpstr:=copy(tmpstr,j+length(sys02),length(tmpstr));
  j:=pos(sys03,tmpstr);
  str1:=copy(tmpstr,0,j-1);
 
  //下载图片
   vFileStream:=TFileStream.Create(ExtractFilePath(application.ExeName)+'/weather.jpg',fmCreate,fmShareDenyNone);
   try
     //IdHTTP1.Get('http://173.16.80.26/inputdb.mdb',vFileStream);
     HTTP.Get(str1,vFileStream);
    //mage1.Picture.Bitmap.LoadFromStream(vfilestream);
   finally
    vFileStream.Free;
   end;//try..finally
  {sleep(1000);
  image1.Picture.LoadFromFile( ExtractFilePath(application.ExeName)+'/weather.jpg');
  }
  j:=pos(sys04,tmpstr);
  tmpstr:=copy(tmpstr, j+length(sys04),length(tmpstr));
  j:=pos(sys05,tmpstr);
  str1:=copy(tmpstr,0,j-1);
  str1:=stringreplace(str1,' ','',[rfreplaceall]);
  str1:=stringreplace(str1,chr(13),'',[rfreplaceall]);
  str1:=stringreplace(str1,chr(10),'',[rfreplaceall]);
  str1:=stringreplace(str1,'<br>','  ',[rfreplaceall]);
  http.Free;
  result:=str1;
 end;