Delphi DLL
Outlook --Download Attachments for a Specific Message

Demonstrates how to download the attachments for a particular email message.
Note: This example requires Chilkat v9.5.0.67 or greater.
Chilkat Delphi DLL Downloads

Delphi DLL
uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, CkDateTime, FileAccess, StringBuilder, JsonObject, Http, BinData;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
http: HCkHttp;
sbResponse: HCkStringBuilder;
messageId: PWideChar;
json: HCkJsonObject;
sbSavePath: HCkStringBuilder;
attachData: HCkBinData;
lastMod: HCkDateTime;
fac: HCkFileAccess;
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 := CkHttp_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).

CkHttp_putAuthToken(http,'MICROSOFT_GRAPH_ACCESS_TOKEN');

sbResponse := CkStringBuilder_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

CkHttp_ClearUrlVars(http);
CkHttp_SetUrlVar(http,'userPrincipalName','chilkatsoft@outlook.com');

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

// Send the request to download the attachments.
success := CkHttp_QuickGetSb(http,'https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments',sbResponse);
if ((success <> True) and (CkHttp_getLastStatus(http) = 0)) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

// The attachment data is contained within the JSON response.
json := CkJsonObject_Create();
CkJsonObject_LoadSb(json,sbResponse);
CkJsonObject_putEmitCompact(json,False);

Memo1.Lines.Add('Status code = ' + IntToStr(CkHttp_getLastStatus(http)));
if (CkHttp_getLastStatus(http) <> 200) then
  begin
    Memo1.Lines.Add(CkJsonObject__emit(json));
    Memo1.Lines.Add('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 := CkStringBuilder_Create();
attachData := CkBinData_Create();
lastMod := CkDateTime_Create();
fac := CkFileAccess_Create();

i := 0;
numMessages := CkJsonObject_SizeOfArray(json,'value');
while i < numMessages do
  begin
    CkJsonObject_putI(json,i);

    Memo1.Lines.Add('name: ' + CkJsonObject__stringOf(json,'value[i].name'));
    Memo1.Lines.Add('contentType: ' + CkJsonObject__stringOf(json,'value[i].contentType'));
    sizeInBytes := CkJsonObject_IntOf(json,'value[i].size');
    Memo1.Lines.Add('size: ' + IntToStr(sizeInBytes));

    // Extract the data and save to a file.
    CkStringBuilder_SetString(sbSavePath,'qa_output/');
    CkStringBuilder_Append(sbSavePath,CkJsonObject__stringOf(json,'value[i].name'));

    CkBinData_Clear(attachData);
    CkBinData_AppendEncoded(attachData,CkJsonObject__stringOf(json,'value[i].contentBytes'),'base64');
    CkBinData_WriteFile(attachData,CkStringBuilder__getAsString(sbSavePath));

    // Get the last-modified date/time and set the output file's last-mod date/time..
    CkDateTime_SetFromTimestamp(lastMod,CkJsonObject__stringOf(json,'value[i].lastModifiedDateTime'));
    CkFileAccess_SetLastModified(fac,CkStringBuilder__getAsString(sbSavePath),lastMod);

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

    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
// 	----
// 

CkHttp_Dispose(http);
CkStringBuilder_Dispose(sbResponse);
CkJsonObject_Dispose(json);
CkStringBuilder_Dispose(sbSavePath);
CkBinData_Dispose(attachData);
CkDateTime_Dispose(lastMod);
CkFileAccess_Dispose(fac);

end;