(Delphi DLL) S3 List Bucket Objects (using Chilkat REST)

Demonstrates how to fetch a list of objects in an S3 bucket.

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, AuthAws, Rest, Xml, StringBuilder;

...

procedure TForm1.Button1Click(Sender: TObject);
var
rest: HCkRest;
bTls: Boolean;
port: Integer;
bAutoReconnect: Boolean;
success: Boolean;
authAws: HCkAuthAws;
sbResponse: HCkStringBuilder;
statusCode: Integer;
xml: HCkXml;
Key: PWideChar;
LastModified: PWideChar;
ETag: PWideChar;
SizeDecimalStr: PWideChar;
ID: PWideChar;
DisplayName: PWideChar;
StorageClass: PWideChar;
Name: PWideChar;
MaxKeys: Integer;
IsTruncated: PWideChar;
i: Integer;
count_i: Integer;

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

rest := CkRest_Create();

// Connect to the Amazon AWS REST server.
bTls := True;
port := 443;
bAutoReconnect := True;
success := CkRest_Connect(rest,'s3.amazonaws.com',port,bTls,bAutoReconnect);

// ----------------------------------------------------------------------------
// Important: For buckets created in regions outside us-east-1,
// there are three important changes that need to be made.
// See Working with S3 Buckets in Non-us-east-1 Regions for the details.
// ----------------------------------------------------------------------------

// Provide AWS credentials for the REST call.
authAws := CkAuthAws_Create();
CkAuthAws_putAccessKey(authAws,'AWS_ACCESS_KEY');
CkAuthAws_putSecretKey(authAws,'AWS_SECRET_KEY');
CkAuthAws_putServiceName(authAws,'s3');
success := CkRest_SetAuthAws(rest,authAws);

//  Set the bucket name via the HOST header.
//  In this case, the bucket name is "chilkat100".
CkRest_putHost(rest,'chilkat100.s3.amazonaws.com');

sbResponse := CkStringBuilder_Create();
success := CkRest_FullRequestNoBodySb(rest,'GET','/',sbResponse);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

statusCode := CkRest_getResponseStatusCode(rest);
Memo1.Lines.Add('Response status code = ' + IntToStr(statusCode));

xml := CkXml_Create();
CkXml_LoadSb(xml,sbResponse,True);
Memo1.Lines.Add(CkXml__getXml(xml));

if (statusCode <> 200) then
  begin
    Memo1.Lines.Add('Failed.  See error information in the XML.');
    Exit;
  end;

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

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');
    ID := CkXml__getChildContent(xml,'Contents[i]|Owner|ID');
    DisplayName := CkXml__getChildContent(xml,'Contents[i]|Owner|DisplayName');
    StorageClass := CkXml__getChildContent(xml,'Contents[i]|StorageClass');
    i := i + 1;
  end;

CkRest_Dispose(rest);
CkAuthAws_Dispose(authAws);
CkStringBuilder_Dispose(sbResponse);
CkXml_Dispose(xml);

end;