(Delphi ActiveX) OSS List Bucket Objects (Alibaba Cloud)

See more Alibaba Cloud OSS Examples

Demonstrates how to list the objects in a bucket.

The Chilkat S3 functions in the HTTP class are compatible with Alibaba Cloud's OSS service.

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;
bucketName: WideString;
strXml: WideString;
xml: TChilkatXml;
success: Integer;
Key: WideString;
LastModified: WideString;
ETag: WideString;
SizeDecimalStr: WideString;
StorageClass: WideString;
ID: WideString;
DisplayName: WideString;
ListBucketResult_xmlns: WideString;
Name: WideString;
MaxKeys: Integer;
IsTruncated: WideString;
i: Integer;
count_i: Integer;

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

http := TChilkatHttp.Create(Self);

// Insert your AccessKey ID here:
http.AwsAccessKey := 'access-key';

// Insert your AccessKey Secret here:
http.AwsSecretKey := 'secret-key';

// To list objects in a bucket located in a different region, use the endpoint for that region, such as "oss-cn-hangzhou.aliyuncs.com 	"
// See Alibaba Object Storage Service Regions and Endpoints
http.AwsEndpoint := 'oss-us-east-1.aliyuncs.com';

bucketName := 'chilkat';

strXml := http.S3_ListBucketObjects(bucketName);
if (http.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Response status code = ' + IntToStr(http.LastStatus));

xml := TChilkatXml.Create(Self);
success := xml.LoadXml(strXml);
if (success <> 1) then
  begin
    Memo1.Lines.Add(xml.LastErrorText);
    Exit;
  end;

// If the response status code was not 200, then the XML response is not a 
// listing of objects, but instead contains error information.
if (http.LastStatus <> 200) then
  begin
    Memo1.Lines.Add(xml.GetXml());
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

// A sample response is shown below.
Memo1.Lines.Add(xml.GetXml());
Memo1.Lines.Add('----');

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

// <?xml version="1.0" encoding="UTF-8"?>
// <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
//     <Name>chilkat</Name>
//     <Prefix/>
//     <Marker/>
//     <MaxKeys>1000</MaxKeys>
//     <IsTruncated>false</IsTruncated>
//     <Contents>
//         <Key>orchard.json</Key>
//         <LastModified>2021-10-29T16:58:12.000Z</LastModified>
//         <ETag>"303FB46CF341094FEF6274B7789CD6AA"</ETag>
//         <Size>22</Size>
//         <StorageClass>STANDARD</StorageClass>
//         <Owner>
//             <ID>5035535379748121</ID>
//             <DisplayName>5035535379748121</DisplayName>
//         </Owner>
//     </Contents>
//     <Contents>
//         <Key>seahorse.jpg</Key>
//         <LastModified>2021-10-29T16:52:01.000Z</LastModified>
//         <ETag>"A8551F0A5437F43A796FCA7623EE9232"</ETag>
//         <Size>24388</Size>
//         <StorageClass>STANDARD</StorageClass>
//         <Owner>
//             <ID>5035535379748121</ID>
//             <DisplayName>5035535379748121</DisplayName>
//         </Owner>
// 
//     </Contents>
// </ListBucketResult>

ListBucketResult_xmlns := xml.GetAttrValue('xmlns');
Name := xml.GetChildContent('Name');
MaxKeys := xml.GetChildIntValue('MaxKeys');
IsTruncated := xml.GetChildContent('IsTruncated');
i := 0;
count_i := xml.NumChildrenHavingTag('Contents');
while i < count_i do
  begin
    xml.I := i;
    Key := xml.GetChildContent('Contents[i]|Key');
    LastModified := xml.GetChildContent('Contents[i]|LastModified');
    ETag := xml.GetChildContent('Contents[i]|ETag');
    SizeDecimalStr := xml.GetChildContent('Contents[i]|Size');
    StorageClass := xml.GetChildContent('Contents[i]|StorageClass');
    ID := xml.GetChildContent('Contents[i]|Owner|ID');
    DisplayName := xml.GetChildContent('Contents[i]|Owner|DisplayName');
    i := i + 1;
  end;
end;