(Delphi ActiveX) Azure Storage: List Blobs

Azure Storage Blob Service REST API: Sample code to fetch the list of blobs in the specified container.

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
rest: TChilkatRest;
bTls: Integer;
port: Integer;
bAutoReconnect: Integer;
success: Integer;
azAuth: TChilkatAuthAzureStorage;
responseStr: WideString;
xml: TChilkatXml;
lastMod: TCkDateTime;
numBlobs: Integer;
i: Integer;
dt: IDtObj;
lastModStr: WideString;

begin
// Azure Blob Service Example: List the blobs in a specified container.
// See also: https://msdn.microsoft.com/en-us/library/azure/dd135734.aspx

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

rest := TChilkatRest.Create(Self);

// Connect to the Azure Storage Blob Service
bTls := 1;
port := 443;
bAutoReconnect := 1;
// In this example, the storage account name is "chilkat".
success := rest.Connect('chilkat.blob.core.windows.net',port,bTls,bAutoReconnect);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// Provide Azure Cloud credentials for the REST call.
azAuth := TChilkatAuthAzureStorage.Create(Self);
azAuth.AccessKey := 'AZURE_ACCESS_KEY';
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
azAuth.Account := 'chilkat';
azAuth.Scheme := 'SharedKey';
azAuth.Service := 'Blob';
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
azAuth.XMsVersion := '2021-08-06';
success := rest.SetAuthAzureStorage(azAuth.ControlInterface);

// Note: The application does not need to explicitly set the following
// headers: x-ms-date, Authorization.  These headers
// are automatically set by Chilkat.

// The expected success response is a 200 response status code with an XML response body.
// In this example, we are listing the blobs in the container named "mycontainer".
responseStr := rest.FullRequestNoBody('GET','/mycontainer?restype=container&comp=list');
if (rest.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// When successful, the Azure Storage service will respond with a 200 response status code,
// with an XML response body.

if (rest.ResponseStatusCode <> 200) then
  begin
    // Examine the request/response to see what happened.
    Memo1.Lines.Add('response status code = ' + IntToStr(rest.ResponseStatusCode));
    Memo1.Lines.Add('response status text = ' + rest.ResponseStatusText);
    Memo1.Lines.Add('response header: ' + rest.ResponseHeader);
    Memo1.Lines.Add('response body (if any): ' + responseStr);
    Memo1.Lines.Add('---');
    Memo1.Lines.Add('LastRequestStartLine: ' + rest.LastRequestStartLine);
    Memo1.Lines.Add('LastRequestHeader: ' + rest.LastRequestHeader);
    Exit;
  end;

// Load the XML response for parsing.
// An example of the response XML is shown below.
xml := TChilkatXml.Create(Self);
success := xml.LoadXml(responseStr);

Memo1.Lines.Add(xml.GetXml());

// Let's iterate over the blobs...

lastMod := TCkDateTime.Create(Self);

numBlobs := xml.NumChildrenAt('Blobs');
i := 0;
while i < numBlobs do
  begin
    Memo1.Lines.Add('---- Blob ' + IntToStr(i) + ' ----');
    xml.I := i;
    Memo1.Lines.Add('Name: ' + xml.GetChildContent('Blobs|Blob[i]|Name'));
    Memo1.Lines.Add('Content-Length: ' + xml.GetChildContent('Blobs|Blob[i]|Properties|Content-Length'));
    Memo1.Lines.Add('Content-Type: ' + xml.GetChildContent('Blobs|Blob[i]|Properties|Content-Type'));
    Memo1.Lines.Add('Content-MD5: ' + xml.GetChildContent('Blobs|Blob[i]|Properties|Content-MD5'));
    Memo1.Lines.Add('BlobType: ' + xml.GetChildContent('Blobs|Blob[i]|Properties|BlobType'));
    Memo1.Lines.Add('LeaseStatus: ' + xml.GetChildContent('Blobs|Blob[i]|Properties|LeaseStatus'));
    lastMod.SetFromRfc822(xml.GetChildContent('Blobs|Blob[i]|Properties|Last-Modified'));
    dt := lastMod.GetDtObj(1);
    Memo1.Lines.Add('Last-Modified YMD: ' + IntToStr(dt.Year) + ',' + IntToStr(dt.Month) + ',' + IntToStr(dt.Day));

    i := i + 1;
  end;

Memo1.Lines.Add('-------------------------');

// Use the ChilkatPath method to get information for a specific blob:

// For example, let's say we want the Last-Modified date/time for
// the blob named "helloWorld.txt"
lastModStr := xml.ChilkatPath('/C/Name,helloWorld.txt|..|Properties|Last-Modified|*');
Memo1.Lines.Add('helloWorld.txt Last-Modified: ' + lastModStr);

Memo1.Lines.Add('Success.');

// <?xml version="1.0" encoding="utf-8" ?>
// <EnumerationResults ServiceEndpoint="https://chilkat.blob.core.windows.net/" ContainerName="test">
//     <Blobs>
//         <Blob>
//             <Name>hamletC.xml</Name>
//             <Properties>
//                 <Last-Modified>Mon, 02 May 2016 23:50:30 GMT</Last-Modified>
//                 <Etag>0x8D372E48B6D323A</Etag>
//                 <Content-Length>279658</Content-Length>
//                 <Content-Type>application/octet-stream</Content-Type>
//                 <Content-Encoding />
//                 <Content-Language />
//                 <Content-MD5>4E6prI9haw81xadSLeEj3Q==</Content-MD5>
//                 <Cache-Control />
//                 <Content-Disposition>attachment; filename="hamletC.xml"</Content-Disposition>
//                 <BlobType>BlockBlob</BlobType>
//                 <LeaseStatus>unlocked</LeaseStatus>
//                 <LeaseState>available</LeaseState>
//             </Properties>
//         </Blob>
//         <Blob>
//             <Name>helloWorld.txt</Name>
//             <Properties>
//                 <Last-Modified>Mon, 02 May 2016 15:21:55 GMT</Last-Modified>
//                 <Etag>0x8D3729D7EE38299</Etag>
//                 <Content-Length>12</Content-Length>
//                 <Content-Type>application/octet-stream</Content-Type>
//                 <Content-Encoding />
//                 <Content-Language />
//                 <Content-MD5>7Qdih1MuhjZehB6Sv8UNjA==</Content-MD5>
//                 <Cache-Control />
//                 <Content-Disposition>attachment; filename="helloWorld.txt"</Content-Disposition>
//                 <BlobType>BlockBlob</BlobType>
//                 <LeaseStatus>unlocked</LeaseStatus>
//                 <LeaseState>available</LeaseState>
//             </Properties>
//         </Blob>
//         <Blob>
//             <Name>thisIsATest.txt</Name>
//             <Properties>
//                 <Last-Modified>Tue, 03 May 2016 00:22:13 GMT</Last-Modified>
//                 <Etag>0x8D372E8F9B2A62E</Etag>
//                 <Content-Length>1600</Content-Length>
//                 <Content-Type>application/octet-stream</Content-Type>
//                 <Content-Encoding />
//                 <Content-Language />
//                 <Content-MD5>FhgUXYfePg2ItsraPmz0Xg==</Content-MD5>
//                 <Cache-Control />
//                 <Content-Disposition>attachment; filename="thisIsATest.txt"</Content-Disposition>
//                 <BlobType>BlockBlob</BlobType>
//                 <LeaseStatus>unlocked</LeaseStatus>
//                 <LeaseState>available</LeaseState>
//             </Properties>
//         </Blob>
//     </Blobs>
//     <NextMarker />
// </EnumerationResults>
// 
end;