(Delphi ActiveX) Asynchronous HTTP SOAP 1.2 Request and Response using POST

Demonstrates a working asynchronous SOAP 1.2 request and response using POST with a live server. You may try running this example with the URLs and data provided. See http://wsf.cdyne.com/WeatherWS/Weather.asmx?op=GetCityWeatherByZIP for details.

Note: This example is correct in theory, but no longer works for live testing because the SOAP service provider (cdyne.com) has made changes or discontinued the free 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.httpTaskCompleted(ASender: TObject;  const completedTask: IChilkatTask);
var
      resp: TChilkatHttpResponse;
success: Integer;
xmlResponse: TChilkatXml;
begin
    // TThread.Synchronize provides safety for callbacks that occur in a background thread..
    TThread.Synchronize(nil, procedure begin
      // A finished task could be one that was canceled, aborted, or truly finished.  

      // If the task was "canceled", it was canceled prior to actually starting.  This could
      // happen if the task was canceled while waiting in a thread pool queue to be scheduled by Chilkat's
      // background thread pool scheduler.  

      // If the task was "aborted", it indicates that it was canceled while running in a background thread.  
      // The ResultErrorText will likely indicate that the task was aborted.

      // If the task "completed", then it ran to completion, but the actual success/failure of the method
      // is determined by the result obtained via a GetResult* method.  (A "completed" task will
      // have a StatusInt equal to 7.   If the task finished, but was not completed, then it must've
      // been aborted or canceled:
      if (completedTask.StatusInt <> 7) then
        begin
          Memo1.Lines.Add('Task did not complete.');
          Memo1.Lines.Add('task status: ' + completedTask.Status);
          Exit;
        end;

      // The synchronous call to QuickGetObj would return an HTTP response object.  To get this 
      // response object for the async call, we instantiate a new/empty HTTP response object,
      // and then load it from the completed task.
      resp := TChilkatHttpResponse.Create(Self);

      success := resp.LoadTaskResult(completedTask.ControlInterface);
      if (success <> 1) then
        begin
          Memo1.Lines.Add(resp.LastErrorText);
          Exit;
        end;

      // Now that we have the response, we can get all of the information:

      Memo1.Lines.Add('status code: ' + IntToStr(resp.StatusCode));
      Memo1.Lines.Add('response header: ' + resp.Header);

      xmlResponse := TChilkatXml.Create(Self);
      xmlResponse.LoadXml(resp.BodyStr);
      Memo1.Lines.Add(xmlResponse.GetXml());
      end);
end;


procedure TForm1.Button1Click(Sender: TObject);
var
http: TChilkatHttp;
success: Integer;
soapXml: TChilkatXml;
req: TChilkatHttpRequest;
task: IChilkatTask;

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

    http := TChilkatHttp.Create(Self);
    http.OnTaskCompleted := httpTaskCompleted;

    soapXml := TChilkatXml.Create(Self);

    soapXml.Tag := 'soap12:Envelope';
    soapXml.AddAttribute('xmlns:xsi','http://www.w3.org/2001/XMLSchema-instance');
    soapXml.AddAttribute('xmlns:xsd','http://www.w3.org/2001/XMLSchema');
    soapXml.AddAttribute('xmlns:soap12','http://www.w3.org/2003/05/soap-envelope');

    soapXml.NewChild2('soap12:Body','');
    soapXml.GetChild2(0);
    soapXml.NewChild2('GetCityWeatherByZIP','');
    soapXml.GetChild2(0);
    soapXml.AddAttribute('xmlns','http://ws.cdyne.com/WeatherWS/');
    soapXml.NewChild2('ZIP','60187');
    soapXml.GetRoot2();

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

    req := TChilkatHttpRequest.Create(Self);
    req.HttpVerb := 'POST';
    req.SendCharset := 0;
    req.AddHeader('Content-Type','application/soap+xml; charset=utf-8');
    req.AddHeader('SOAPAction','http://ws.cdyne.com/WeatherWS/GetCityWeatherByZIP');
    req.Path := '/WeatherWS/Weather.asmx';
    req.LoadBodyFromString(soapXml.GetXml(),'utf-8');

    http.FollowRedirects := 1;

    task := http.SynchronousRequestAsync('wsf.cdyne.com',80,0,req.ControlInterface);
    if (http.LastMethodSuccess <> 1) then
      begin
        Memo1.Lines.Add(http.LastErrorText);
        Exit;
      end;

    // Schedule the task for running on the thread pool.  This changes the task's state
    // from Inert to Live.
    success := task.Run();
    if (success <> 1) then
      begin
        Memo1.Lines.Add(task.LastErrorText);

        Exit;
      end;

    // The application is now free to do anything else
    // while the HTTP request is in progress.  When the task
    // is completed, the TaskCompleted method is called.

    // -------------------------------------------------------------------------------
    // The following is a general note that applies to all programming languages:
    // -------------------------------------------------------------------------------

    // NOTE: This is very important:  The TaskCompleted callback runs in the background thread.  
    // (All callbacks from an async task, such as AbortCheck, PercentDone, ProgressInfo, etc. are in the background thread.) 
    // An application that uses TaskCompleted must be very careful.  
    // For example, user interface elements (such as labels, text boxes, etc.) may not be directly
    // accessible from a background thread, and could crash the application if directly accessed.  Also, attempting to debug
    // code running in a background thread from an IDE, especially an older IDE (such as VB6) is likely to crash the IDE.
end;