TIdHTTP.Get EIdIOHandlerPropInvalid错误 [英] TIdHTTP.Get EIdIOHandlerPropInvalid Error

问题描述

我正在尝试使用TIdHTTP.Get将USPS Zip4结果网页源加载到变量中（以提取4位邮政编码后缀），例如

I am trying to use TIdHTTP.Get to load the USPS Zip4 result web page source into a variable (to extract the 4 digit zip code suffix), e.g.,

PgSrc := IdHTTP1.Get('https://tools.usps.com/go/ZipLookupResultsAction!input.action?resultMode=0&companyName=&address1=1600+PENNSYLVANIA+AVE+NW&address2=&city=&state=Select&urbanCode=&postalCode=&zip=20500');

如果我将其粘贴到任何浏览器中，上述示例网址工作正常。但是，在我的代码中，我得到一个EIdIOHandlerPropInvalid错误，并显示以下消息IOHandler值无效。

The above example url works fine if I paste it into any browser. However, in my code I get an EIdIOHandlerPropInvalid error with the following message "IOHandler value is not valid."

我有很多邮政编码可以查找，所以我会赞赏任何帮助以避免此错误或建议使用不同的方法。

I have many zip codes to look up, so I would appreciate any help to avoid this error or a suggestion for a different approach.

推荐答案

为避免此异常，您必须分配IOHandler属性。

To avoid this exception you must assign the IOHandler property.

查看此示例。

{$APPTYPE CONSOLE}

{$R *.res}

uses
  IdHTTP,
  IdSSLOpenSSL,
  SysUtils;

Var
  IdHTTP1 : TIdHTTP;
  Src : string;
  LHandler: TIdSSLIOHandlerSocketOpenSSL;
begin
  try
   IdHTTP1:=TIdHTTP.Create(nil);
   try
    LHandler := TIdSSLIOHandlerSocketOpenSSL.Create(nil);
    try
      IdHTTP1.IOHandler:=LHandler;
      Src:= IdHTTP1.Get('https://tools.usps.com/go/ZipLookupResultsAction!input.action?resultMode=0&companyName=&address1=1600+PENNSYLVANIA+AVE+NW&address2=&city=&state=Select&urbanCode=&postalCode=&zip=20500');
      Writeln(Src);
    finally
      LHandler.Free;
    end;
   finally
     IdHTTP1.Free;
   end;
  except on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);
  end;
  Readln;
end.

注意：还要记住将SSL DLL（libeay32.dll，ssleay32.dll）复制到您的系统中。

Note : Also remember copy the SSL DLL (libeay32.dll, ssleay32.dll) to your system.

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