(Delphi ActiveX) Google Cloud Storage List Bucket Objects

See more Google Cloud Storage Examples

List the objects in a Google Cloud Storage bucket.

For more information, see https://cloud.google.com/storage/docs/json_api/v1/objects/list

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
sbToken: TChilkatStringBuilder;
http: TChilkatHttp;
success: Integer;
resp: IChilkatHttpResponse;
responseCode: Integer;
json: TChilkatJsonObject;
id: WideString;
selfLink: WideString;
mediaLink: WideString;
name: WideString;
bucket: WideString;
generation: WideString;
metageneration: WideString;
contentType: WideString;
storageClass: WideString;
size: WideString;
md5Hash: WideString;
crc32c: WideString;
etag: WideString;
timeCreated: WideString;
updated: WideString;
timeStorageClassUpdated: WideString;
kind: WideString;
i: Integer;
count_i: Integer;

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

// This example uses a previously obtained access token having permission for the 
// scope "https://www.googleapis.com/auth/cloud-platform"

// In this example, Get Google Cloud Storage OAuth2 Access Token, 
// the service account access token was saved to a text file.  This example fetches the access token from the file..
sbToken := TChilkatStringBuilder.Create(Self);
sbToken.LoadFile('qa_data/tokens/googleCloudStorageAccessToken.txt','utf-8');

http := TChilkatHttp.Create(Self);
http.AuthToken := sbToken.GetAsString();

// For more info see Cloud Storage Documentation - Objects: list 
// 
success := http.SetUrlVar('bucket','chilkat-ocean');
success := http.SetUrlVar('PROJECT_NAME','ChilkatCloud');

resp := http.QuickGetObj('https://www.googleapis.com/storage/v1/b/{$bucket}/o?project={$ChilkatCloud}');
if (http.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

responseCode := resp.StatusCode;
if (responseCode = 401) then
  begin
    Memo1.Lines.Add(resp.BodyStr);
    Memo1.Lines.Add('If invalid credentials, then it is likely the access token expired.');
    Memo1.Lines.Add('Your app should automatically fetch a new access token and re-try.');

    Exit;
  end;

Memo1.Lines.Add('Response code: ' + IntToStr(responseCode));
Memo1.Lines.Add('Response body');

json := TChilkatJsonObject.Create(Self);
success := json.Load(resp.BodyStr);

json.EmitCompact := 0;

Memo1.Lines.Add(json.Emit());

// A response code = 200 indicates success, and the response body contains JSON such as this:

// {
//   "kind": "storage#objects",
//   "items": [
//     {
//       "kind": "storage#object",
//       "id": "chilkat-ocean/file with space char.jpg/1555776690752366",
//       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/file%20with%20space%20char.jpg",
//       "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/file%20with%20space%20char.jpg?generation=1555776690752366&alt=media",
//       "name": "file with space char.jpg",
//       "bucket": "chilkat-ocean",
//       "generation": "1555776690752366",
//       "metageneration": "1",
//       "contentType": "image/jpeg",
//       "storageClass": "MULTI_REGIONAL",
//       "size": "6229",
//       "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
//       "crc32c": "9RjgwQ==",
//       "etag": "CO6WguiH3+ECEAE=",
//       "timeCreated": "2019-04-20T16:11:30.752Z",
//       "updated": "2019-04-20T16:11:30.752Z",
//       "timeStorageClassUpdated": "2019-04-20T16:11:30.752Z"
//     },
//     {
//       "kind": "storage#object",
// 
//       "id": "chilkat-ocean/penguins.jpg/1555775749593296",
//       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/penguins.jpg",
//       "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/penguins.jpg?generation=1555775749593296&alt=media",
//       "name": "penguins.jpg",
//       "bucket": "chilkat-ocean",
//       "generation": "1555775749593296",
//       "metageneration": "1",
//       "contentType": "image/jpeg",
//       "storageClass": "MULTI_REGIONAL",
//       "size": "777835",
//       "md5Hash": "nTd7EM53jEk4s8fixjoimg==",
//       "crc32c": "ixxYVw==",
//       "etag": "CNCxnqeE3+ECEAE=",
//       "timeCreated": "2019-04-20T15:55:49.593Z",
//       "updated": "2019-04-20T15:55:49.593Z",
//       "timeStorageClassUpdated": "2019-04-20T15:55:49.593Z"
//     },
//     {
//       "kind": "storage#object",
//       "id": "chilkat-ocean/starfish.jpg/1628958192639968",
//       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-ocean/o/starfish.jpg",
//       "mediaLink": "https://www.googleapis.com/download/storage/v1/b/chilkat-ocean/o/starfish.jpg?generation=1628958192639968&alt=media",
//       "name": "starfish.jpg",
//       "bucket": "chilkat-ocean",
//       "generation": "1628958192639968",
//       "metageneration": "1",
//       "contentType": "image/jpeg",
//       "storageClass": "MULTI_REGIONAL",
//       "size": "6229",
//       "md5Hash": "LpxZ2/JmI2fcl9/dqF2gSA==",
//       "crc32c": "9RjgwQ==",
//       "etag": "COC/tJP2sPICEAE=",
//       "timeCreated": "2021-08-14T16:23:12.660Z",
//       "updated": "2021-08-14T16:23:12.660Z",
//       "timeStorageClassUpdated": "2021-08-14T16:23:12.660Z"
//     }
//   ]
// }

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

kind := json.StringOf('kind');
i := 0;
count_i := json.SizeOfArray('items');
while i < count_i do
  begin
    json.I := i;
    kind := json.StringOf('items[i].kind');
    id := json.StringOf('items[i].id');
    selfLink := json.StringOf('items[i].selfLink');
    mediaLink := json.StringOf('items[i].mediaLink');
    name := json.StringOf('items[i].name');
    bucket := json.StringOf('items[i].bucket');
    generation := json.StringOf('items[i].generation');
    metageneration := json.StringOf('items[i].metageneration');
    contentType := json.StringOf('items[i].contentType');
    storageClass := json.StringOf('items[i].storageClass');
    size := json.StringOf('items[i].size');
    md5Hash := json.StringOf('items[i].md5Hash');
    crc32c := json.StringOf('items[i].crc32c');
    etag := json.StringOf('items[i].etag');
    timeCreated := json.StringOf('items[i].timeCreated');
    updated := json.StringOf('items[i].updated');
    timeStorageClassUpdated := json.StringOf('items[i].timeStorageClassUpdated');
    i := i + 1;
  end;
end;