SOAP Web Service (HTTP POST)

Demonstrates how to call PostXml to call a SOAP web service.

Download Chilkat XML ActiveX

Download Chilkat HTTP ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATXMLLib_TLB,
    CHILKATHTTPLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: TChilkatHttp;
success: Integer;
xml: CHILKATXMLLib_TLB.IChilkatXml;
strXml: String;
resp: IChilkatHttpResponse;
responseStatusCode: Integer;
endPoint: String;
xmlResp: CHILKATXMLLib_TLB.IChilkatXml;
unwrappedXml: String;
xmlMeat: CHILKATXMLLib_TLB.IChilkatXml;

begin

http := TChilkatHttp.Create(Self);

//  Any string unlocks the component for the 1st 30-days.
success := http.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(http.LastErrorText);
    Exit;
  end;

//  This example uses a live web service at:
//  http://www.webservicex.net/uklocation.asmx
//  It gets the UK town,Postcode and County by Postcode(First Section of Post Code)

//  The SOAP XML will look like this:
//  <?xml version="1.0" encoding="utf-8"?>
//  <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
//    <soap:Body>
//      <GetUKLocationByPostCode xmlns="http://www.webserviceX.NET">
//        <PostCode>string</PostCode>
//      </GetUKLocationByPostCode>
//    </soap:Body>
//  </soap:Envelope>

//  For this example's sake, we'll load the XML from a file.  We'll test using PostCode "E3".
//  The SOAP XML for this example may be downloaded from:
//  http://www.chilkatsoft.com/testData/ukPostCodeSoap.xml
xml := TChilkatXml.Create(Self).ControlInterface;
success := xml.LoadXmlFile('ukPostCodeSoap.xml');
if (success <> 1) then
  begin
    ShowMessage(xml.LastErrorText);
    Exit;
  end;

strXml := xml.GetXml();

//  We'll need to add this in the HTTP header:
//  SOAPAction: "http://www.webserviceX.NET/GetUKLocationByPostCode"
http.SetRequestHeader('SOAPAction','http://www.webserviceX.NET/GetUKLocationByPostCode');

//  Some services expect the content-type in the HTTP header to be "application/xml" while
//  other expect text/xml.  The default sent by Chilkat is "application/xml", but this web service
//  expects "text/xml".  Therefore, change the content-type:
http.SetRequestHeader('Content-Type','text/xml; charset=utf-8');

//  The endpoint for this soap service is:
endPoint := 'http://www.webservicex.net/uklocation.asmx';

//  Note: This particular web service was live and functioning at the time this example
//  was written.  It is possible that as time progresses, this web service will no longer
//  be availble...
resp := http.PostXml(endPoint,strXml,'utf-8');
if (resp = nil ) then
  begin
    Memo1.Lines.Add(http.LastErrorText);

    Memo1.Lines.Add('LastHeader:');
    Memo1.Lines.Add(http.LastHeader);
  end
else
  begin

    responseStatusCode := resp.StatusCode;
    //  You may wish to verify that the responseStatusCode equals 200...
    Memo1.Lines.Add('Response Status Code: '
         + IntToStr(responseStatusCode));

    //  You may examine the exact HTTP header sent with the POST like this:
    Memo1.Lines.Add('LastHeader:');
    Memo1.Lines.Add(http.LastHeader);

    //  Examine the XML returned by the web service:
    Memo1.Lines.Add('XML Response:');
    xmlResp := TChilkatXml.Create(Self).ControlInterface;
    success := xmlResp.LoadXml(resp.BodyStr);
    //  Assume the LoadXml is successful...
    //  Get rid of the SOAP wrappings and get to the meat of this particular response.
    //  The TagContent method returns the content of the 1st node in the XML document
    //  having a specific tag:

    unwrappedXml := xmlResp.TagContent('GetUKLocationByPostCodeResult');
    Memo1.Lines.Add(unwrappedXml);

    //  The unwrapped XML could be loaded into an XML object and parsed...
    xmlMeat := TChilkatXml.Create(Self).ControlInterface;
    success := xmlMeat.LoadXml(unwrappedXml);

    //  ...
  end;


end;