First sample (Delphi)

Overview

This sample provides an introduction to using the Delphi edition of the Remoting SDK product.

The example shows how to define/implement methods on the server and how to access them from the client. The data consists of name information; four simple methods are provided by the service: Nicknames, VerifyName, CheckName and FullNames.

Getting Started

• Build or compile both projects.
• Launch the server (via the menu command: Tools -> Remoting SDK -> Launch Server Executable).
• Ensure that FirstSampleClient is the selected project and run it.
• Check that the client buttons work as expected.
• Modify the server names list and retry client actions.

Examine the Code

• See how the four methods were defined by editing the service library. Do this by making the server the selected project and by using the menu option: Tools -> Remoting SDK -> Edit Service Library.

• Check how the server methods were implemented in FirstSampleService_Impl.pas. For example, the Nicknames method's code is:

function TFirstSampleService.Nicknames(const FullName: Unicodestring): Unicodestring;
var
  i: integer;
begin
  Result := '';
  with FirstSampleServerMainForm do begin
    MultiReadSingleWriter.BeginRead;
    try
      with ValueListEditor.Strings do
        for i := 0 to Count - 1 do
          if (Fullname = '') or (CompareText(Values[Names[i]], FullName) = 0) then
            Result := Result + ',' + Names[i];
    finally
      MultiReadSingleWriter.EndRead;
    end;
  end;
  if Result <> '' then Delete(Result, 1, 1);
end;

• Examine the simple code needed to invoke the methods in FirstSampleClientMain.pas. First of all, it is necessary to create a service instance:

constructor TFirstSampleClientMainForm.Create(aOwner: TComponent);
begin
  inherited;

  fFirstService := (RORemoteService as IFirstSampleService);
end;

And call its method, Nicknames for example:

procedure TFirstSampleClientMainForm.GetButtonClick(Sender: TObject);
begin
  NamesBox.Items.CommaText := fFirstService.Nicknames(eFullname.Text);
end;