Delphi DLL

Download a Binary File into Memory

See more Azure Cloud Storage Examples

Downloads a binary file into memory. Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, BinData, Rest, AuthAzureStorage, StringBuilder;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
rest: HCkRest;
bTls: Boolean;
port: Integer;
bAutoReconnect: Boolean;
azAuth: HCkAuthAzureStorage;
bdFileContents: HCkBinData;
sbXmlErr: HCkStringBuilder;

begin
success := False;

// Azure File Service Example: Download a Binary File to Memory
// See:  https://docs.microsoft.com/en-us/rest/api/storageservices/get-file

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

rest := CkRest_Create();

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

// Provide Azure Cloud credentials for the REST calls.
azAuth := CkAuthAzureStorage_Create();
CkAuthAzureStorage_putAccessKey(azAuth,'AZURE_ACCESS_KEY');
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
CkAuthAzureStorage_putAccount(azAuth,'chilkat');
CkAuthAzureStorage_putScheme(azAuth,'SharedKey');
CkAuthAzureStorage_putService(azAuth,'File');
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
CkAuthAzureStorage_putXMsVersion(azAuth,'2021-08-06');
success := CkRest_SetAuthAzureStorage(rest,azAuth);

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

// Send a GET request to download the file "penguins.jpg" to a BinData object.
// (The share name is "pip")
bdFileContents := CkBinData_Create();
success := CkRest_FullRequestNoBodyBd(rest,'GET','/pip/wildlife/antarctic/penguins.jpg',bdFileContents);
if (success = False) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// When successful, the response status will be 200.
// If a non-success status code is returned, then the bdFileContents actually contains the XML error message.
if (CkRest_getResponseStatusCode(rest) <> 200) then
  begin
    // Examine the request/response to see what happened.
    Memo1.Lines.Add('response status code = ' + IntToStr(CkRest_getResponseStatusCode(rest)));
    Memo1.Lines.Add('response status text = ' + CkRest__responseStatusText(rest));
    Memo1.Lines.Add('response header: ' + CkRest__responseHeader(rest));
    sbXmlErr := CkStringBuilder_Create();
    CkStringBuilder_AppendBd(sbXmlErr,bdFileContents,'utf-8',0,0);
    Memo1.Lines.Add('response body (if any): ' + CkStringBuilder__getAsString(sbXmlErr));
    Memo1.Lines.Add('---');
    Memo1.Lines.Add('LastRequestStartLine: ' + CkRest__lastRequestStartLine(rest));
    Memo1.Lines.Add('LastRequestHeader: ' + CkRest__lastRequestHeader(rest));
    Exit;
  end;

Memo1.Lines.Add('Size of the downloaded file = ' + IntToStr(CkBinData_getNumBytes(bdFileContents)));

// See the online reference documentation for the BinData class for ways
// to access the bytes.

CkBinData_WriteFile(bdFileContents,'qa_output/penguins.jpg');

CkRest_Dispose(rest);
CkAuthAzureStorage_Dispose(azAuth);
CkBinData_Dispose(bdFileContents);
    CkStringBuilder_Dispose(sbXmlErr);

end;