一个delphi投票的问题

Question

procedure TForm1.Button1Click(Sender: TObject);const
  BaseUrl ='URL;
var strMsg:string;
    sParams:TStringStream;
    checkbox5:string;
    Params:TStrings;
    str1:string;
    str2:string;
    str3:string;  HTML:String;
beginstr1:='checkbox5='+'%BD%AD%CE%F7%CA%A1%C9%F3%BC%C6%CC%FC%BB%FA%B9%D8';
str2:='&name='+httpencode(memo2.Lines.Strings[i]);
str3:='&nums='+memo3.Lines.Strings[i];
i:=i+1;//label1.Caption:=inttostr (i);IdHTTP1.HandleRedirects :=true;
sParams:=TStringStream.Create('');
IdHTTP1.Request.Accept:='application/x-shockwave-flash, image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*';
IdHTTP1.Request.Referer:='URL';
IdHTTP1.Request.AcceptLanguage:='zh-cn';
IdHTTP1.Request.UserAgent:='Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0)';
IdHTTP1.Request.ContentType:='application/x-www-form-urlencoded';
IdHTTp1.Request.AcceptEncoding:='gzip, deflate';
IdHTTP1.Request.Host:='ip';
IdHTTP1.Request.Connection:='Keep-Alive'  ;
IdHTTP1.Request.CacheControl:='no-cache';
IdHTTP1.HTTPOptions:=IdHTTP1.HTTPOptions+[hoKeepOrigProtocol];  //使用HTTP1.1协议最关键的一步
IdHTTP1.ProtocolVersion:=pv1_1;
//IdHTTP1.Request.ContentLength :=length(Edit1.Text );
//sParams.Add(edit1.Text+edit2.Text+edit3.text+'&Submit=++++++%CE%D2%D2%AA%CD%B6%C6%B1++++++');
sParams.WriteString(str1+str2+str3+'&Submit=++++++%CE%D2%D2%AA%CD%B6%C6%B1++++++');
IdHTTP1.HTTPOptions:=[hoForceEncodeParams];
try
  HTML :=IdHTTP1.Post(BaseURL+'URL',sParams);
  except
  showmessage('error');
  exit;
  end;
  Memo1.text:=IdHTTP1.ResponseText;
  IdHTTP1.Disconnect;
  FreeAndNil(IdHTTP1);
  FreeAndNil(Params);
  end;i在interface中定义了，为什么我点第二次的时候会出错呢？

Answer 1

你首先要确定出错在什么地方，你可以试着每次先把IdHTTP1给disconnect

Answer 2

IdHTTP1:=TIdHttp.Create();
idHttp1.xxx:=;
  try
    HTML :=IdHTTP1.Post(BaseURL+'URL',sParams);
  except
    showmessage('error');
  exit;
  end;
  Memo1.text:=IdHTTP1.ResponseText;
  IdHTTP1.Disconnect;
  FreeAndNil(IdHTTP1);
  FreeAndNil(Params);
  end

Answer 3

要么你在过程中每次动态创建HTTP，要么你在过程中就别释放HTTP，在窗体关闭时再释放

Answer 4

procedure TForm1.Button1Click(Sender: TObject);const
  BaseUrl ='URL;
var strMsg:string;
  sParams:TStringStream;
  checkbox5:string;
  Params:TStrings;
  str1:string;
  str2:string;
  str3:string;  HTML:String;
beginstr1:='checkbox5='+'%BD%AD%CE%F7%CA%A1%C9%F3%BC%C6%CC%FC%BB%FA%B9%D8';
str2:='&name='+httpencode(memo2.Lines.Strings[i]);
str3:='&nums='+memo3.Lines.Strings[i];
i:=i+1;//label1.Caption:=inttostr (i);IdHTTP1.HandleRedirects :=true;
sParams:=TStringStream.Create('');
IdHTTP1.Request.Accept:='application/x-shockwave-flash, image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*';
IdHTTP1.Request.Referer:='URL';
IdHTTP1.Request.AcceptLanguage:='zh-cn';
IdHTTP1.Request.UserAgent:='Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0)';
IdHTTP1.Request.ContentType:='application/x-www-form-urlencoded';
IdHTTp1.Request.AcceptEncoding:='gzip, deflate';
IdHTTP1.Request.Host:='ip';
IdHTTP1.Request.Connection:='Keep-Alive' ;
IdHTTP1.Request.CacheControl:='no-cache';
IdHTTP1.HTTPOptions:=IdHTTP1.HTTPOptions+[hoKeepOrigProtocol]; //使用HTTP1.1协议最关键的一步
IdHTTP1.ProtocolVersion:=pv1_1;
//IdHTTP1.Request.ContentLength :=length(Edit1.Text );
//sParams.Add(edit1.Text+edit2.Text+edit3.text+'&Submit=++++++%CE%D2%D2%AA%CD%B6%C6%B1++++++');
sParams.WriteString(str1+str2+str3+'&Submit=++++++%CE%D2%D2%AA%CD%B6%C6%B1++++++');
IdHTTP1.HTTPOptions:=[hoForceEncodeParams];
try
  HTML :=IdHTTP1.Post(BaseURL+'URL',sParams);
  except
  showmessage('error');
  exit;
  end;
  Memo1.text:=IdHTTP1.ResponseText;
  IdHTTP1.Disconnect;
//  FreeAndNil(IdHTTP1);//不应该被释放
  FreeAndNil(sParams); //关键是这里，你释放错了
  end;