Pascal (Lazarus/Delphi)

Outlook --Download Attachments for a Specific Message

See more Outlook Examples

Demonstrates how to download the attachments for a particular email message.

Note: This example requires Chilkat v9.5.0.67 or greater.

This example applies to: Exchange Online | Office 365 | Hotmail.com | Live.com | MSN.com | Outlook.com | Passport.com

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.CkDateTime,
  Chilkat.FileAccess,
  Chilkat.StringBuilder,
  Chilkat.JsonObject,
  Chilkat.Http,
  Chilkat.BinData;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  sbResponse: TStringBuilder;
  messageId: string;
  json: TJsonObject;
  sbSavePath: TStringBuilder;
  attachData: TBinData;
  lastMod: TCkDateTime;
  fac: TFileAccess;
  i: Integer;
  numMessages: Integer;
  sizeInBytes: Integer;

begin
  success := False;

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

  http := THttp.Create;

  //  Use your previously obtained access token here:
  //  See the following examples for getting an access token:
  //     Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
  //     Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
  //     Refresh Access Token (Azure AD v2.0 Endpoint).
  //     Refresh Access Token (Azure AD Endpoint).

  http.AuthToken := 'MICROSOFT_GRAPH_ACCESS_TOKEN';

  sbResponse := TStringBuilder.Create;

  //  Sends:  GET /users/{user_id | userPrincipalName}/messages/{message_id}/attachments
  //  Note: It is also possible to use the literal string "me" for the current logged-on user.
  //  For example: GET /me/messages/{message_id}/attachments

  http.ClearUrlVars();
  http.SetUrlVar('userPrincipalName','chilkatsoft@outlook.com');

  //  Assume we already have a message ID from previously listing the messages in a folder
  messageId := 'AAMkADYzZWE3YmZmLWU0YzgtNGNkZC04MGE1LWFiYTFlNTRlY2QwYQBGAAAAAAAu7cUXL5YOTrdsUIw7-v8FBwBUcG0qWqkmQYqWLHQataQxAACnwqJUAABUcG0qWqkmQYqWLHQataQxAACnwrnOAAA=';
  http.SetUrlVar('message_id',messageId);

  //  Send the request to download the attachments.
  success := http.QuickGetSb('https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments',sbResponse);
  if ((success <> True) and (http.LastStatus = 0)) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  //  The attachment data is contained within the JSON response.
  json := TJsonObject.Create;
  json.LoadSb(sbResponse);
  json.EmitCompact := False;

  WriteLn('Status code = ' + http.LastStatus);
  if (http.LastStatus <> 200) then
    begin
      WriteLn(json.Emit());
      WriteLn('Failed.');
    end;

  //  This is a sample JSON response.  The code for parsing and extracting/saving the attachments
  //  is shown below.

  //  	{
  //  	  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('chilkatsoft%40outlook.com')/messages('AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAA%3D%3D')/attachments",
  //  	  "value": [
  //  	    {
  //  	      "@odata.type": "#microsoft.graph.fileAttachment",
  //  	      "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAft6wtbaSJU6sgQLi98DI0Q==",
  //  	      "lastModifiedDateTime": "2017-05-10T00:30:51Z",
  //  	      "name": "fishing.pdf",
  //  	      "contentType": "application/pdf",
  //  	      "size": 295680,
  //  	      "isInline": false,
  //  	      "contentId": "F861B218BE380F44B16933097FDDACFC@namprd20.prod.outlook.com",
  //  	      "contentLocation": null,
  //  	      "contentBytes": "JVBERi0xLjMKJcfsj6 ... yZWYKMjk0MzY5CiUlRU9GCg=="
  //  	    },
  //  	    {
  //  	      "@odata.type": "#microsoft.graph.fileAttachment",
  //  	      "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAXS7qXQ-iRUCYXnhJpN8Ihg==",
  //  	      "lastModifiedDateTime": "2017-05-10T00:30:51Z",
  //  	      "name": "testCert.cer",
  //  	      "contentType": "application/octet-stream",
  //  	      "size": 1674,
  //  	      "isInline": false,
  //  	      "contentId": "5E51FA33EF0F8941ACC8260395CB1A33@namprd20.prod.outlook.com",
  //  	      "contentLocation": null,
  //  	      "contentBytes": "MIIFRjCCBC6gAwIBA ... 7pt3C5w=="
  //  	    }
  //  	  ]
  //  	}

  sbSavePath := TStringBuilder.Create;
  attachData := TBinData.Create;
  lastMod := TCkDateTime.Create;
  fac := TFileAccess.Create;

  i := 0;
  numMessages := json.SizeOfArray('value');
  while i < numMessages do
    begin
      json.I := i;

      WriteLn('name: ' + json.StringOf('value[i].name'));
      WriteLn('contentType: ' + json.StringOf('value[i].contentType'));
      sizeInBytes := json.IntOf('value[i].size');
      WriteLn('size: ' + sizeInBytes);

      //  Extract the data and save to a file.
      sbSavePath.SetString('qa_output/');
      sbSavePath.Append(json.StringOf('value[i].name'));

      attachData.Clear();
      attachData.AppendEncoded(json.StringOf('value[i].contentBytes'),'base64');
      attachData.WriteFile(sbSavePath.GetAsString());

      //  Get the last-modified date/time and set the output file's last-mod date/time..
      lastMod.SetFromTimestamp(json.StringOf('value[i].lastModifiedDateTime'));
      fac.SetLastModified(sbSavePath.GetAsString(),lastMod);

      WriteLn('----');

      i := i + 1;
    end;

  //  The output of the above loop is:
  //  
  //  	name: fishing.pdf
  //  	contentType: application/pdf
  //  	size: 295680
  //  	----
  //  	name: testCert.cer
  //  	contentType: application/octet-stream
  //  	size: 1674
  //  	----
  //  


  http.Free;
  sbResponse.Free;
  json.Free;
  sbSavePath.Free;
  attachData.Free;
  lastMod.Free;
  fac.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.