Iohandler value is not valid как исправить

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');

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.»

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.

asked Jul 19, 2012 at 4:34

I’m trying to grab the XML file results after using a Google Maps API query, but my Delphi app is throwing a »

iohandler value is not valid

.» error. The «IdHTTP1.Get» line appears to be the culprit, but why?

My goal is to get the latitude and longitude coordinates from the results of the query and post them to a database. Here’s my code that’s producing the error.

 procedure TViewMaps.GetXMLBtnClick(Sender: TObject);
var
    lat, lng: String;
    xml: IXMLDocument;
    s: TStream;
begin
  // Create XML File to hard disk
  s := TFileStream.Create('mydata.xml', fmCreate);
    try
      IdHTTP1.Get('https://maps.googleapis.com/maps/api/geocode/xml?address=1600+Amphitheatre+Parkway,+Mountain+View,+CA&key=MyKey',s);
      xml := TXMLDocument.Create(nil);
             {xml.LoadFromXML(sName),  at: xml.ChildNodes.FindNode = ('result') ChildNodes.FindNode ('formatted_address . ');  }
      // Load XML file for data display
      XMLDocument1.LoadFromFile('mydata.xml');
      XMLDocument1.Active := True;
        //lat := XMLDocument1.DocumentElement;
    finally
      XMLDocument1.Active := False;
      s.Free;
    end;
  end;

I am having issues posting to Amazon’s SES Service using Indy’s TIdHTTP.

Here is an example of the code i am using:

procedure TMainFrm.btnAmazonSESClick(Sender: TObject);
var
  SSLHandler: TIdSSLIOHandlerSocket;
  HttpClient: TIdHTTP;  
  Params: TStringStream;
begin
  SSLHandler := TIdSSLIOHandlerSocket.Create(Self);
  HttpClient := TIdHTTP.Create(Self);  
  Params := TStringStream.create('');
  try
    with SSLHandler do
      SSLOptions.Method := sslvSSLv3
    with HttpClient do
    begin
      IOHandler := SSLHandler;
      AllowCookies := True;
      HandleRedirects := True;
      HTTPOptions := [hoForceEncodeParams];
      Request.ContentType := 'application/x-www-form-urlencoded';
    end;
    PageMemo.Text := HttpClient.Post('https://email.us-east-1.amazonaws.com?Action=VerifyEmailAddress&AWSAccessKeyId=012Some123Key46&EmailAddress=test@test%2Ecom', Params);
  finally
    SSLHandler.Free;
    HttpClient.Free; 
    Params.Free;
  end;
end;

Result

• Under Indy 10.5.7 I get the error: HTTP/1.1 404 Not Found

• Under Indy 9.0.14 I get the error: Socket

  Error # 11004

Debugging Trials

• This same demo can successfully GET the HTML from an HTTPS web page.

• If i paste the URL above into a browser it displays the expected XML result.

I would appreciate any advice on the cause.

This post is

just an incomplete wild guess

.

Maybe Remy might help you to correct it. With the following code I’m getting HTTP/1.1 400 Bad Request but I’m not wondering because the

API reference

talks about

Common Query Parameters

where is at least required the digital signature you’ll create for the request what I don’t know how to do.

I can’t test this at all because I have no account there. But I think the

procedure TForm1.Button1Click(Sender: TObject);
var
  HTTPClient: TIdHTTP;
  Parameters: TStrings;
  SSLHandler: TIdSSLIOHandlerSocketOpenSSL;
begin
  SSLHandler := TIdSSLIOHandlerSocketOpenSSL.Create(nil);
  HTTPClient := TIdHTTP.Create(nil);
  Parameters := TStringList.Create;
  try
    SSLHandler.SSLOptions.Method := sslvSSLv3;
    SSLHandler.SSLOptions.Mode := sslmUnassigned;
    HTTPClient.IOHandler := SSLHandler;
    HTTPClient.HTTPOptions := [hoForceEncodeParams];
    HTTPClient.Request.ContentType := 'application/x-www-form-urlencoded';
    Parameters.Add('Action=VerifyEmailAddress');
    Parameters.Add('EmailAddress=test@test.com');
    Parameters.Add('AWSAccessKeyId=012Some123Key46');
    Parameters.Add('SignatureVersion=2');
    Parameters.Add('Expires='); // ???
    Parameters.Add('Signature='); // ???
    PageMemo.Text := HTTPClient.Post('https://email.us-east-1.amazonaws.com', Parameters);
  finally
    SSLHandler.Free;
    HTTPClient.Free; 
    Parameters.Free;
  end;
end;

Basically, you need to use the right library, i.e.:

For Indy 10.5.7 use openssl-1.0.1e-i386-win32 or openssl-1.0.1e-x64_86-win64 from http://indy.fulgan.com/SSL/
You may want to download an ssl demo from: http://indy.fulgan.com/ZIP/

Regards

Jose

I’m trying to load a

TImage

starting from an URL as explained in this answer.

uses
  GIFImg;
procedure TForm1.Button1Click(Sender: TObject);
var
  Stream : TMemoryStream;
  GIF : TGIFImage;
begin
  Stream := TMemoryStream.Create;
  GIF := TGIFImage.Create;
  try
    IdHTTP1.Get('http://www.google.com/intl/en_ALL/images/logo.gif', Stream);
    //IdHTTP1.Get('https://www.google.com/intl/en_ALL/images/logo.gif', Stream);
    Stream.Position := 0;
    GIF.LoadFromStream(Stream);
    Image1.Picture.Assign(GIF);
  finally
    FreeAndNil(GIF);
    FreeAndNil(Stream);
  end;
end;

All works good if the URL starts with a simple HTTP.

When I try to load from an HTTPS URL, I get an

EIdIOHandlerPropInvalid

exception with message:

IOHandler value is not valid.

I’ve tried adding a

TIdSSLIOHandlerSocketOpenSSL

and setting it as

IOHandler

for the

TIdHTTP

component.

After doing that, I get an

EIdOSSLCouldNotLoadSSLLibrary

exception with the following message:

Could not load SSL library

.

Is there something wrong in the properties or some other problem?

You need the SSL library (two .DLL files) either installed in your Windows, or distributed along with your application.

Seems to be downloadable here:

https://slproweb.com/products/Win32OpenSSL.html

Or via their official web site (but I can’t find downloadable binaries there — only source code):

https://www.openssl.org/source/

Pre-compiled .DLLs for use with Indy can be downloaded here:

https://indy.fulgan.com/SSL/ (Thanks, Zed)

When I try to load from an HTTPS URL, I get an

EIdIOHandlerPropInvalid

exception with message:

IOHandler value is not valid.

That error means you don’t have an

TIdSSLIOHandlerSocketBase

-derived component attached to the

TIdHTTP.IOHandler

property, such as

TIdSSLIOHandlerSocketOpenSSL

.

This error also tells me that you are using an outdated version of Indy and need to upgrade.

TIdHTTP

automatically creates a default

SSLIOHandler

when requesting an HTTPS url and no

IOHandler

is currently assigned, and has done so for a long time.

I’ve tried adding a

TIdSSLIOHandlerSocketOpenSSL

and setting it as

IOHandler

for the

TIdHTTP

component.

That is the correct solution, if you do not want to upgrade, or if you need to customize the

SSLIOHandler

settings, such as for enabling TLS 1.1+ (which

TIdSSLIOHandlerSocketOpenSSL

does not do by default yet).

After doing that, I get an

EIdOSSLCouldNotLoadSSLLibrary

exception with the following message:

Could not load SSL library.

That error means that either

• you have not deployed the

  OpenSSL DLLs

  (
  
libeay32.dll

  and
  
ssleay32.dll

  ) with your app, or at least have them installed somewhere on your system’s DLL search path.

• you are using a version of the DLLs that is incompatible with your version of Indy. The current version of Indy supports

  openssl 1.0.2

  and earlier (support for OpenSSL 1.1.x is currently a work in progress).

After the error is raised, you can use Indy’s

WhichFailedToLoad()

function in the

IdSSLOpenSSLHeaders

unit to determine the root cause of the failure — whether the DLLs themselves could not be loaded in memory (because they were not found, etc), or because they are missing specific exports that Indy requires.