(Delphi DLL) 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 non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Xml, Http;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
bucketName: PWideChar;
strXml: PWideChar;
xml: HCkXml;
success: Boolean;
Key: PWideChar;
LastModified: PWideChar;
ETag: PWideChar;
SizeDecimalStr: PWideChar;
StorageClass: PWideChar;
ID: PWideChar;
DisplayName: PWideChar;
ListBucketResult_xmlns: PWideChar;
Name: PWideChar;
MaxKeys: Integer;
IsTruncated: PWideChar;
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 := CkHttp_Create();

// Insert your AccessKey ID here:
CkHttp_putAwsAccessKey(http,'access-key');

// Insert your AccessKey Secret here:
CkHttp_putAwsSecretKey(http,'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
CkHttp_putAwsEndpoint(http,'oss-us-east-1.aliyuncs.com');

bucketName := 'chilkat';

strXml := CkHttp__s3_ListBucketObjects(http,bucketName);
if (CkHttp_getLastMethodSuccess(http) <> True) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

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

xml := CkXml_Create();
success := CkXml_LoadXml(xml,strXml);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkXml__lastErrorText(xml));
    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 (CkHttp_getLastStatus(http) <> 200) then
  begin
    Memo1.Lines.Add(CkXml__getXml(xml));
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

// A sample response is shown below.
Memo1.Lines.Add(CkXml__getXml(xml));
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 := CkXml__getAttrValue(xml,'xmlns');
Name := CkXml__getChildContent(xml,'Name');
MaxKeys := CkXml_GetChildIntValue(xml,'MaxKeys');
IsTruncated := CkXml__getChildContent(xml,'IsTruncated');
i := 0;
count_i := CkXml_NumChildrenHavingTag(xml,'Contents');
while i < count_i do
  begin
    CkXml_putI(xml,i);
    Key := CkXml__getChildContent(xml,'Contents[i]|Key');
    LastModified := CkXml__getChildContent(xml,'Contents[i]|LastModified');
    ETag := CkXml__getChildContent(xml,'Contents[i]|ETag');
    SizeDecimalStr := CkXml__getChildContent(xml,'Contents[i]|Size');
    StorageClass := CkXml__getChildContent(xml,'Contents[i]|StorageClass');
    ID := CkXml__getChildContent(xml,'Contents[i]|Owner|ID');
    DisplayName := CkXml__getChildContent(xml,'Contents[i]|Owner|DisplayName');
    i := i + 1;
  end;

CkHttp_Dispose(http);
CkXml_Dispose(xml);

end;