(Delphi ActiveX) SOAP Web Service (HTTP POST)

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

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
xml: TChilkatXml;
success: Integer;
strXml: WideString;
responseStatusCode: Integer;
http: TChilkatHttp;
endPoint: WideString;
resp: IChilkatHttpResponse;
xmlResp: TChilkatXml;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// --------------------------------------------------------------------------------
// Also see Chilkat's Online WSDL Code Generator
// to generate code and SOAP Request and Response XML for each operation in a WSDL.
// --------------------------------------------------------------------------------

// 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);
success := xml.LoadXmlFile('ukPostCodeSoap.xml');
if (success <> 1) then
  begin
    Memo1.Lines.Add(xml.LastErrorText);
    Exit;
  end;

strXml := xml.GetXml();

http := TChilkatHttp.Create(Self);

// 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 (http.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Memo1.Lines.Add('LastHeader:');
    Memo1.Lines.Add(http.LastHeader);
    Exit;
  end;

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);
xmlResp.LoadXml(resp.BodyStr);
Memo1.Lines.Add(xmlResp.GetXml());

// Use this online tool to generate parsing code from response XML: 
// Generate Parsing Code from XML
end;