Pascal (Lazarus/Delphi)
SendGrid HTML Email with Embedded Images

Demonstrates how to send an HTML email with embedded images using SendGrid.
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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.Http,
  Chilkat.HttpResponse,
  Chilkat.StringBuilder,
  Chilkat.JsonObject,
  Chilkat.HttpRequest,
  Chilkat.BinData;

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

procedure RunDemo;
var
  success: Boolean;
  req: THttpRequest;
  http: THttp;
  bdJpg: TBinData;
  sbHtml: TStringBuilder;
  json: TJsonObject;
  resp: THttpResponse;

begin
  success := False;

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

  req := THttpRequest.Create;
  http := THttp.Create;

  //  First.. load a JPG file and build an HTML img tag with the JPG data inline encoded.
  //  Our HTML img tag will look like this:
  //  <img src="data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEA3ADcAA..." alt="" style="border-width:0px;" />
  bdJpg := TBinData.Create;
  success := bdJpg.LoadFile('qa_data/jpg/starfish.jpg');
  if (success = False) then
    begin
      WriteLn('Failed to load JPG file.');
      Exit;
    end;

  //  Note: HTML containing embedded base64 image data may not be visible in all email clients.
  //  For example, GMail might not display the image, but viewing in Outlook might be OK.
  sbHtml := TStringBuilder.Create;
  sbHtml.Append('<html><body><b>This is a test<b><br /><img src="data:image/jpeg;base64,');
  //  Append the base64 image data to sbHtml.
  bdJpg.GetEncodedSb('base64',sbHtml);
  sbHtml.Append('" alt="" style="border-width:0px;" /></body></html>');

  json := TJsonObject.Create;
  json.UpdateString('personalizations[0].to[0].email','matt@chilkat.io');
  json.UpdateString('personalizations[0].to[0].name','Matt');
  json.UpdateString('from.email','admin@chilkatsoft.com');
  json.UpdateString('subject','Test HTML email with images');
  json.UpdateString('content[0].type','text/html');
  json.UpdateSb('content[0].value',sbHtml);

  http.AuthToken := 'SENDGRID_API_KEY';

  resp := THttpResponse.Create;
  success := http.HttpJson('POST','https://api.sendgrid.com/v3/mail/send',json,'application/json',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  WriteLn('response status code: ' + resp.StatusCode);
  //  Display the response.
  //  If successful, the response code is 202 and the response body string is empty.
  //  (The response body string may also be empty for error response codes.)
  WriteLn(resp.BodyStr);


  req.Free;
  http.Free;
  bdJpg.Free;
  sbHtml.Free;
  json.Free;
  resp.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.