Delphi DLL
Outlook Send Email with Attachments

This example sends a plain-text email with attachments. Other examples exist for:
Sending plain-text email.
Sending HTML email.
Sending HTML email with embedded images.
Sending HTML email with embedded images and attachments.
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, Http, BinData, HttpResponse, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
http: HCkHttp;
attach1: HCkBinData;
attach2: HCkBinData;
json: HCkJsonObject;
resp: HCkHttpResponse;

begin
success := False;

// Important: This example requires Chilkat v9.5.0.68 or greater.

// 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');

// To send mail, we'll POST to the following endpoint:
// 
// POST /users/{id | userPrincipalName}/sendMail
// 
// (The special keyword "me" may be used in place of a principal name.)
// 

// Load the files to be attached.
attach1 := CkBinData_Create();
CkBinData_LoadFile(attach1,'qa_data/pdf/fishing.pdf');
attach2 := CkBinData_Create();
CkBinData_LoadFile(attach2,'qa_data/msword/sample.docx');

// The body of the POST request contains JSON that specifies the email subject, body,
// recipients, etc.  This example will build the following JSON plain-text email:
// 

// 	{
// 	  "message": {
// 	    "subject": "Sample Email with Attachments",
// 	    "body": {
// 	      "contentType": "Text",
// 	      "content": "This is the plain-text body..."
// 	    },
// 	    "toRecipients": [
// 	      {
// 	        "emailAddress": {
// 		  "name": "Chilkat Software",
// 	          "address": "admin@chilkat.io"
// 	        }
// 	      },
// 	      {
// 	        "emailAddress": {
// 	          "address": "chilkat.support@gmail.com"
// 	        }
// 	      }
// 	    ],
// 	    "ccRecipients": [
// 	      {
// 	        "emailAddress": {
// 		  "name": "Chilkat Blog",
// 		  "address": "admin@cknotes.com"
// 	        }
// 	      }
// 	    ],
// 	    "attachments": [
// 	       {
// 	         "@odata.type": "#microsoft.graph.fileAttachment",
// 	         "name": "fishing.pdf",
// 	         "contentType": "application/pdf",
// 	         "size": <theActualSize>,
// 	         "isInline": false,
// 	         "contentBytes": "base64_data_here"
// 	       },
// 	       {
// 	         "@odata.type": "#microsoft.graph.fileAttachment",
// 	         "name": "sample.docx",
// 	         "contentType": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
// 	         "size": <theActualSize>,
// 	         "isInline": false,
// 	         "contentBytes": "base64_data_here"
// 	       }
// 	    ]
// 	  },
// 	  "saveToSentItems": true
// 	}
// 
// Build the above JSON.
json := CkJsonObject_Create();
CkJsonObject_UpdateString(json,'message.subject','Sample Email with Attachments');
CkJsonObject_UpdateString(json,'message.body.contentType','Text');
CkJsonObject_UpdateString(json,'message.body.content','This is the plain-text body...');

CkJsonObject_UpdateString(json,'message.toRecipients[0].emailAddress.name','Chilkat Software');
CkJsonObject_UpdateString(json,'message.toRecipients[0].emailAddress.address','admin@chilkat.io');
CkJsonObject_UpdateString(json,'message.toRecipients[1].emailAddress.address','chilkat.support@gmail.com');
CkJsonObject_UpdateString(json,'message.ccRecipients[0].emailAddress.name','Chilkat Blog');
CkJsonObject_UpdateString(json,'message.ccRecipients[0].emailAddress.address','admin@cknotes.com');

CkJsonObject_UpdateString(json,'message.attachments[0]."@odata.type"','#microsoft.graph.fileAttachment');
CkJsonObject_UpdateString(json,'message.attachments[0].name','fishing.pdf');
CkJsonObject_UpdateString(json,'message.attachments[0].contentType','application/pdf');
CkJsonObject_UpdateInt(json,'message.attachments[0].size',CkBinData_getNumBytes(attach1));
CkJsonObject_UpdateBool(json,'message.attachments[0].isInline',False);
CkJsonObject_UpdateBd(json,'message.attachments[0].contentBytes','base64',attach1);

CkJsonObject_UpdateString(json,'message.attachments[1]."@odata.type"','#microsoft.graph.fileAttachment');
CkJsonObject_UpdateString(json,'message.attachments[1].name','sample.docx');
CkJsonObject_UpdateString(json,'message.attachments[1].contentType','application/vnd.openxmlformats-officedocument.wordprocessingml.document');
CkJsonObject_UpdateInt(json,'message.attachments[1].size',CkBinData_getNumBytes(attach2));
CkJsonObject_UpdateBool(json,'message.attachments[1].isInline',False);
CkJsonObject_UpdateBd(json,'message.attachments[1].contentBytes','base64',attach2);

CkJsonObject_UpdateBool(json,'saveToSentItems',True);

// -------------------------------------------------------------
// Important: This example requires Chilkat v9.5.0.68 or greater.
// -------------------------------------------------------------

// Send the HTTP POST (i.e. send the HTML email)
resp := CkHttpResponse_Create();
success := CkHttp_HttpJson(http,'POST','https://graph.microsoft.com/v1.0/me/sendMail',json,'application/json',resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

// The send succeeded if the response status code = 202.
// In the success case, there is no response body.  (We just get the response code to know that it succeeded.)
if (CkHttpResponse_getStatusCode(resp) <> 202) then
  begin
    CkJsonObject_Load(json,CkHttpResponse__bodyStr(resp));
    CkJsonObject_putEmitCompact(json,False);
    Memo1.Lines.Add(CkJsonObject__emit(json));
    Memo1.Lines.Add('Failed, response status code = ' + IntToStr(CkHttpResponse_getStatusCode(resp)));
  end
else
  begin
    Memo1.Lines.Add('Outlook Mail with Attachments Sent.');
  end;

CkHttp_Dispose(http);
CkBinData_Dispose(attach1);
CkBinData_Dispose(attach2);
CkJsonObject_Dispose(json);
CkHttpResponse_Dispose(resp);

end;