(Delphi ActiveX) Making SOAP Requests using the REST API

There's no reason a SOAP request cannot be sent using the REST API. It's only a matter of adding a SOAP specific header, and providing the SOAP XML request body. The response body is the SOAP response XML.

This example sends a request to ws.cdyne.com to get city weather by zip code.

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
rest: TChilkatRest;
bTls: Integer;
port: Integer;
bAutoReconnect: Integer;
success: Integer;
soapXml: TChilkatXml;
responseXml: WideString;
xml: TChilkatXml;

begin
// Demonstrates how to do a SOAP request using the REST API.

// 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.
// --------------------------------------------------------------------------------

rest := TChilkatRest.Create(Self);

// This is the request to be sent:

// POST /WeatherWS/Weather.asmx HTTP/1.1
// Host: wsf.cdyne.com
// Content-Type: text/xml; charset=utf-8
// Content-Length: length
// SOAPAction: "http://ws.cdyne.com/WeatherWS/GetCityWeatherByZIP"
// 
// <?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>
//     <GetCityWeatherByZIP xmlns="http://ws.cdyne.com/WeatherWS/">
//       <ZIP>string</ZIP>
//     </GetCityWeatherByZIP>
//   </soap:Body>
// </soap:Envelope>

// Note: The application does not need to set the Host or Content-Length headers.
// Chilkat will automatically add these headers.

// Make the initial connection (without sending a request yet).
bTls := 0;
port := 80;
bAutoReconnect := 1;
// In this particular case, it is important to connect to "wsf.cdyne.com", not "ws.cdyne.com"...
success := rest.Connect('wsf.cdyne.com',port,bTls,bAutoReconnect);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// Add request headers:
success := rest.AddHeader('Content-Type','text/xml; charset=utf-8');
success := rest.AddHeader('SOAPAction','http://ws.cdyne.com/WeatherWS/GetCityWeatherByZIP');

// Build the SOAP XML request body.
soapXml := TChilkatXml.Create(Self);

soapXml.Tag := 'soap:Envelope';
success := soapXml.AddAttribute('xmlns:xsi','http://www.w3.org/2001/XMLSchema-instance');
success := soapXml.AddAttribute('xmlns:xsd','http://www.w3.org/2001/XMLSchema');
success := soapXml.AddAttribute('xmlns:soap','http://schemas.xmlsoap.org/soap/envelope/');

soapXml.NewChild2('soap:Body','');
success := soapXml.GetChild2(0);
soapXml.NewChild2('GetCityWeatherByZIP','');
success := soapXml.GetChild2(0);
success := soapXml.AddAttribute('xmlns','http://ws.cdyne.com/WeatherWS/');
soapXml.NewChild2('ZIP','60187');
soapXml.GetRoot2();

Memo1.Lines.Add(soapXml.GetXml());

// Send the SOAP request
responseXml := rest.FullRequestString('POST','/WeatherWS/Weather.asmx',soapXml.GetXml());
if (rest.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// When successful, the response status code will equal 200.
if (rest.ResponseStatusCode <> 200) then
  begin
    // Examine the request/response to see what happened.
    Memo1.Lines.Add('response status code = ' + IntToStr(rest.ResponseStatusCode));
    Memo1.Lines.Add('response status text = ' + rest.ResponseStatusText);
    Memo1.Lines.Add('response header: ' + rest.ResponseHeader);
    Memo1.Lines.Add('response body (if any): ' + responseXml);
    Memo1.Lines.Add('---');
    Memo1.Lines.Add('LastRequestStartLine: ' + rest.LastRequestStartLine);
    Memo1.Lines.Add('LastRequestHeader: ' + rest.LastRequestHeader);
    Exit;
  end;

xml := TChilkatXml.Create(Self);
success := xml.LoadXml(responseXml);

// GetXml will emit XML that is nicely indented for human viewing..
Memo1.Lines.Add(xml.GetXml());

// A sample response XML is shown below...

// To get some information, use ChilkatPath.  For example...
Memo1.Lines.Add('Temperature: ' + xml.ChilkatPath('soap:Body|GetCityWeatherByZIPResponse|GetCityWeatherByZIPResult|Temperature|*'));

Memo1.Lines.Add('Success.');

// <?xml version="1.0" encoding="utf-8" ?>
// <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
//     <soap:Body>
//         <GetCityWeatherByZIPResponse xmlns="http://ws.cdyne.com/WeatherWS/">
//             <GetCityWeatherByZIPResult>
//                 <Success>true</Success>
//                 <ResponseText>City Found</ResponseText>
//                 <State>IL</State>
//                 <City>Wheaton</City>
//                 <WeatherStationCity>West Chicago</WeatherStationCity>
//                 <WeatherID>10</WeatherID>
//                 <Description>Mostly Sunny</Description>
//                 <Temperature>33</Temperature>
//                 <RelativeHumidity>39</RelativeHumidity>
//                 <Wind>VRB5</Wind>
//                 <Pressure>30.33F</Pressure>
//                 <Visibility />
//                 <WindChill />
//                 <Remarks />
//             </GetCityWeatherByZIPResult>
//         </GetCityWeatherByZIPResponse>
//     </soap:Body>
// </soap:Envelope>
end;