Pascal (Lazarus/Delphi)

Google Drive Multipart Upload String

See more REST Examples

Demonstrates a file upload to Google Drive where the contents of the file are contained in a string variable. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.AuthGoogle,
  Chilkat.JsonObject,
  Chilkat.Rest;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  gAuth: TAuthGoogle;
  rest: TRest;
  bAutoReconnect: Boolean;
  json: TJsonObject;
  jsonResponse: string;

begin
  success := False;

  //  This example will upload a file to Google Drive.
  success := True;

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

  gAuth := TAuthGoogle.Create;
  gAuth.Scope := 'https://www.googleapis.com/auth/drive';
  gAuth.SubEmailAddress := 'some.user@example.com';
  gAuth.ExpireNumSeconds := 3600;

  //  Obtain an access token as shown in one of the following examples:
  //  See Get Access Token using a Service Account JSON Key
  //  See Get Access Token using a P12 File

  rest := TRest.Create;

  //  Connect using TLS.
  bAutoReconnect := True;
  success := rest.Connect('www.googleapis.com',443,True,bAutoReconnect);

  //  Provide the authentication credentials (i.e. the access key)
  success := rest.SetAuthGoogle(gAuth);

  //  A multipart upload to Google Drive needs a multipart/related Content-Type
  success := rest.AddHeader('Content-Type','multipart/related');

  //  Specify each part of the request.

  //  The 1st part is JSON with information about the file.
  rest.PartSelector := '1';
  success := rest.AddHeader('Content-Type','application/json; charset=UTF-8');

  json := TJsonObject.Create;
  success := json.AddStringAt(-1,'title','helloWorld.txt');
  success := json.AddStringAt(-1,'description','A simple text file that says Hello World.');
  success := json.AddStringAt(-1,'mimeType','text/plain');
  success := rest.SetMultipartBodyString(json.Emit());

  //  The 2nd part is the file content.
  //  In this case, we'll upload a simple text file containing "Hello World!"
  rest.PartSelector := '2';
  success := rest.AddHeader('Content-Type','text/plain');
  success := rest.SetMultipartBodyString('Hello World!');

  //  POST https://www.googleapis.com/upload/drive/v2/files
  jsonResponse := rest.FullRequestMultipart('POST','/upload/drive/v2/files?uploadType=multipart');
  if (rest.LastMethodSuccess <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  Show the JSON response.
  WriteLn('Response Status Code: ' + rest.ResponseStatusCode);
  WriteLn('Json Response: ' + jsonResponse);


  gAuth.Free;
  rest.Free;
  json.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.