Pascal (Lazarus/Delphi)
Pascal (Lazarus/Delphi)
Google Cloud Storage List Bucket Objects
See more Google Cloud Storage Examples
List the objects in a Google Cloud Storage bucket.Chilkat Pascal (Lazarus/Delphi) Downloads
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.Http,
Chilkat.StringBuilder,
Chilkat.HttpResponse,
Chilkat.JsonObject;
// ---------------------------------------------------------------------------
procedure RunDemo;
var
success: Boolean;
sbToken: TStringBuilder;
http: THttp;
resp: THttpResponse;
responseCode: Integer;
json: TJsonObject;
id: string;
selfLink: string;
mediaLink: string;
name: string;
bucket: string;
generation: string;
metageneration: string;
contentType: string;
storageClass: string;
size: string;
md5Hash: string;
crc32c: string;
etag: string;
timeCreated: string;
updated: string;
timeStorageClassUpdated: string;
kind: string;
i: Integer;
count_i: Integer;
begin
success := False;
// 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 := TStringBuilder.Create;
sbToken.LoadFile('qa_data/tokens/googleCloudStorageAccessToken.txt','utf-8');
http := THttp.Create;
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 := THttpResponse.Create;
success := http.HttpNoBody('GET','https://www.googleapis.com/storage/v1/b/{$bucket}/o?project={$ChilkatCloud}',resp);
if (success = False) then
begin
WriteLn(http.LastErrorText);
Exit;
end;
responseCode := resp.StatusCode;
if (responseCode = 401) then
begin
WriteLn(resp.BodyStr);
WriteLn('If invalid credentials, then it is likely the access token expired.');
WriteLn('Your app should automatically fetch a new access token and re-try.');
Exit;
end;
WriteLn('Response code: ' + responseCode);
WriteLn('Response body');
json := TJsonObject.Create;
success := json.Load(resp.BodyStr);
json.EmitCompact := False;
WriteLn(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;
sbToken.Free;
http.Free;
resp.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.