(Delphi ActiveX) Firebase PUT - Writing Data

Demonstrates how to PUT new data to a Firebase JSON database. The data used in this example is at Chilkat Firebase Pigs Database, and is shown here:

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
fac: TCkFileAccess;
accessToken: WideString;
rest: TChilkatRest;
success: Integer;
authGoogle: TChilkatAuthGoogle;
prng: TChilkatPrng;
pushId: WideString;
pigRecord: TChilkatJsonObject;
path: TChilkatStringBuilder;
jsonResponse: WideString;

begin
// Demonstrates how to PUT new data to a Firebase JSON database.

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

// This example assumes a JWT authentication token, if required, has been previously obtained.
// See Get Firebase Access Token from JSON Service Account Private Key for sample code.

// Load the previously obtained Firebase access token into a string.
fac := TCkFileAccess.Create(Self);
accessToken := fac.ReadEntireTextFile('qa_data/tokens/firebaseToken.txt','utf-8');
if (fac.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(fac.LastErrorText);
    Exit;
  end;

rest := TChilkatRest.Create(Self);

// Make the initial connection (without sending a request yet).
// Once connected, any number of requests may be sent.  It is not necessary to explicitly
// call Connect before each request.  
success := rest.Connect('chilkat.firebaseio.com',443,1,1);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;
authGoogle := TChilkatAuthGoogle.Create(Self);
authGoogle.AccessToken := accessToken;
rest.SetAuthGoogle(authGoogle.ControlInterface);

// Chilkat's sample data (pig-rescue data) is publicly readable at: https://chilkat.firebaseio.com/.json
// This data is publicly readable, but not writable.  You'll need to 
// run against your own database..

// Generate a new push ID.
prng := TChilkatPrng.Create(Self);
pushId := prng.FirebasePushId();

// We're going to add a new pig with just the name.
pigRecord := TChilkatJsonObject.Create(Self);
pigRecord.AppendString('name','William');

path := TChilkatStringBuilder.Create(Self);
path.Append('/pig-rescue/animal/');
path.Append(pushId);
path.Append('.json');

// The string content of the last arg passed is  {"name":"William"} 
jsonResponse := rest.FullRequestString('PUT',path.GetAsString(),pigRecord.Emit());
if (rest.LastMethodSuccess <> 1) then
  begin
    // Something happened in the communications (either no request was sent, or no response was received.
    // (The Chilkat REST API also has lower-level methods where an app can send the request in one call,
    // and then receive the response in another call.)
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// Check the response status code.   A 200 response status indicates success.
if (rest.ResponseStatusCode <> 200) then
  begin
    Memo1.Lines.Add(rest.ResponseStatusText);
    Memo1.Lines.Add(jsonResponse);
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

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

// Note: In many of the Chilkat examples, you may notice strange ways
// of doing something that should be simpler and shorter.  For example,
// building the path (above) could've been written differently,
// with some simple string concatenation.
// 
// The reason is that the Chilkat examples are written in a 
// proprietary "example code" scripting language,
// and then automatically generated to each of the different programming
// languages you see on example-code.com.  The code generation is
// limited in what it can do.  For example, string concatentation
// is not yet a feature of the "example code" scripting language (as of May 2016), 
// and therefore you won't see the use of a programming language's string
// concatentation operators in any example.  
// 
end;