(Delphi ActiveX) Initiate Resumable Upload Session

See more Google Cloud Storage Examples

Initiate a Google Cloud Storage resumable upload session..

For more information, see https://cloud.google.com/storage/docs/performing-resumable-uploads

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
http: TChilkatHttp;
jsonToken: TChilkatJsonObject;
success: Integer;
jsonMetaData: TChilkatJsonObject;
url: WideString;
resp: IChilkatHttpResponse;
statusCode: Integer;
sessionUrl: WideString;

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

http := TChilkatHttp.Create(Self);

jsonToken := TChilkatJsonObject.Create(Self);
success := jsonToken.LoadFile('qa_data/tokens/googleCloudStorage.json');
if (success = 0) then
  begin
    Memo1.Lines.Add(jsonToken.LastErrorText);
    Exit;
  end;

jsonMetaData := TChilkatJsonObject.Create(Self);
jsonMetaData.UpdateString('contentType','image/jpeg');

// Adds the "Authorization: Bearer <access_token>" header..
http.AuthToken := jsonToken.StringOf('access_token');

http.SetUrlVar('bucket_name','chilkat-bucket-b');
http.SetUrlVar('object_name','penguins2.jpg');
url := 'https://storage.googleapis.com/upload/storage/v1/b/{$bucket_name}/o?uploadType=resumable&name={$object_name}';
resp := http.PText('POST',url,jsonMetaData.Emit(),'utf-8','application/json',0,0);
if (http.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

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

sessionUrl := '';

if (statusCode <> 200) then
  begin
    Memo1.Lines.Add(resp.BodyStr);
  end
else
  begin
    // The session URL will be used to upload the file in chunks, in subsequent HTTP POSTs...
    sessionUrl := resp.GetHeaderField('Location');
    Memo1.Lines.Add('Session URL = ' + sessionUrl);
  end;
end;