C++ Builder: Convert and print out Bitmap

Question

I'm creating an application on Android using C++ Builder, and I need to print out (not display on screen) a Bitmap already created. To print out, I'm using "Classic Bluetooth Basic App" that Embarcadero offers. To convert I'm using this code:

#include "System.NetEncoding.hpp"

TMemoryStream *ms;
TStringStream *ss;
String s;
UnicodeString result;

ms = new TMemoryStream();
ss = new TStringStream();
bmpResult->SaveToStream(ms);
ms->Position = 0;
EncodeStream(ms, ss);
s = ss->DataString;
ms->Free();
ss->Free();
result = s;
return result;

It returns to me the base64 string, so I could pass it in print out function, but it will print the whole string, and I need the bitmap (the image in itself).

How can I do it?

EDITED:

The code that I'm using to interact with the printer:

  TBytes ToSend;
  if((FSocket == NULL) || (ItemIndex != ComboBoxPaired->ItemIndex)) {
      if(ComboBoxPaired->ItemIndex > -1) {
          TBluetoothDevice * LDevice = FPairedDevices->Items[ComboBoxPaired->ItemIndex];
          FSocket = LDevice->CreateClientSocket(StringToGUID(ServiceGUI), false);
          if(FSocket != NULL) {
              ItemIndex = ComboBoxPaired->ItemIndex;
              FSocket->Connect();
              //func is AnsiString and passed as a parameter in this function
              ToSend = TEncoding::UTF8->GetBytes(func);
              FSocket->SendData(ToSend);

              delete FSocket;
              FSocket = NULL;
          }
          else {
              ShowMessage("Error 1");
          }
      }
      else {
              ShowMessage("Error 2");
      }
  }
      else {
          ShowMessage("Error 4");

      }

I tried to use TEncoding to encode the bitmap and pass to ToSend, but I couldn't found and doesn't make sense because it will print the String (same case as base64).