Envío de imágenes por bluetooth desde el PC al móvil

API de Bluetooth: es una buena idea
Puede utilizar los siguientes pasos:
1. Enumere los servicios telefónicos disponibles con las funciones WSALookupServiceBegin, WSALookupServiceNext
2. Obtenga la dirección del servicio de transferencia de archivos OBEX
3. Crear toma bluetooth
4. Conéctese a la dirección de servicio encontrada.
5. Implementar el protocolo de transferencia de archivos OBEX (comandos Conectar y Colocar – http://netwinder.osuosl.org/pub/netwinder/docs/nw/irda/IrOBEX12.pdf[^], http://dotcom.bluetoothsig.org/SiteCollectionDocuments/GOEP_SPEC_V12.pdf[^]) y enviar el archivo a través del socket
Puedo compartir mi propio proyecto de prueba, pero no sé cómo adjuntarlo a la solución.

<pre>/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// 
// MSDN Bluetooth and Connect
// See: https://msdn.microsoft.com/en-us/library/windows/desktop/aa362901(v=vs.85).aspx
//
// MSDN Send Function
// See: https://msdn.microsoft.com/en-us/library/windows/desktop/ms740149(v=vs.85).aspx
// 
// MSDN Bluetooth and read or write operations:
// See: https://msdn.microsoft.com/en-us/library/windows/desktop/aa362907(v=vs.85).aspx
// 
// Error Codes: 
// See: https://msdn.microsoft.com/en-us/library/windows/desktop/ms740668(v=vs.85).aspx
// 
#include "zss.cmnlib.h"
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
// #include <afxwin.h>
#include <WinSock2.h>
#include <bthsdpdef.h>
#include <bluetoothapis.h>

#include <ws2bth.h>
// #include "Zss.Zsslog.h"
// Preprocessor Directive: Pragma's:
// Need to link with Ws2_32.lib
#pragma comment(lib, "ws2_32.lib")

// define Directive's:
#define DEFAULT_BUFLEN 512

DEFINE_GUID(GUID_NULL, "00000000-0000-0000-0000-000000000000");


int __cdecl main(int argc, char **argv)
{
    std::cout << "******************************************************\r\n";

    //--------------------------------------------
    // Locals:
    //--------------------------------------------
    int result = 0;
    ULONG iResult = 0;

    //--------------------------------------------
    // Prep the Buffer's:
    //--------------------------------------------
    int recvbuflen = DEFAULT_BUFLEN;
    char recvbuf[DEFAULT_BUFLEN] = "";
    // char *sendbuf = "AT+COPS?\r";
    char *sendbuf = "AT+BTVER?\r";
    int len = (int)strlen(sendbuf);

    //--------------------------------------------
    // Initialise WinSock.
    //--------------------------------------------
    WSADATA WSAData = { 0 };
    WORD wVersionRequested = MAKEWORD(2, 2);
    if ((iResult = WSAStartup(wVersionRequested, &WSAData)) != 0)
    {
    }
    std::cout << "WINSOCK: 'WSAData' Return Code: " << WSAGetLastError() << "\r\n";


    //--------------------------------------------
    // The WinSock Socket.
    //--------------------------------------------
    SOCKET LocalSocket = INVALID_SOCKET;


    //--------------------------------------------
    // Local End Point SOCKADDR_BTH.
    //--------------------------------------------
    SOCKADDR_BTH LocalEndpoint;
    // number of service channel, 0 or BT_PORT_ANY;
    LocalEndpoint.port = 0;
    LocalEndpoint.addressFamily = AF_BTH;
    LocalEndpoint.btAddr = 0;
    LocalEndpoint.serviceClassId = GUID_NULL;
    std::cout << "   Local EndPoint Address: " << LocalEndpoint.btAddr << "\r\n";


    //--------------------------------------------
    // Remote End Point SOCKADDR_BTH.
    //--------------------------------------------
    SOCKADDR_BTH RemoteEndPoint;
    // number of service channel, 0 or BT_PORT_ANY;
    RemoteEndPoint.port = 0;
    RemoteEndPoint.addressFamily = AF_BTH;
    // bt address of my smartphone ;
    RemoteEndPoint.btAddr = BTH_ADDR(0xD428D57436B0);
    // RemoteEndPoint.serviceClassId = SerialPortServiceClass_UUID;   // COM Protocol
    // RemoteEndPoint.serviceClassId = OBEXFileTransferServiceClass_UUID;   // error, connect return 10049
    //RemoteEndPoint.serviceClassId = HandsfreeServiceClass_UUID; // RFCOMM_PROTOCOL_UUID
    RemoteEndPoint.serviceClassId = OBEXObjectPushServiceClass_UUID;
    int BTHAddrLength = sizeof(RemoteEndPoint);
    std::cout << "   Remote EndPoint Address: " << RemoteEndPoint.btAddr << "\r\n";

    //--------------------------------------------
    // Create the socket.
    //--------------------------------------------
    if ((LocalSocket = socket(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM)) == INVALID_SOCKET)
    {
    }
    std::cout << "WINSOCK: 'socket' Return Code: " << WSAGetLastError() << "\r\n";

    //--------------------------------------------
    // Bind the socket.
    //--------------------------------------------
    if ((iResult = bind(LocalSocket, (SOCKADDR *)&LocalEndpoint, sizeof(LocalEndpoint))) == SOCKET_ERROR)
    {
    }
    std::cout << "WINSOCK: 'bind' Return Code: " << WSAGetLastError() << "\r\n";

    //--------------------------------------------
    // Connect the socket.
    //--------------------------------------------
    if ((iResult = connect(LocalSocket, (SOCKADDR *)&RemoteEndPoint, sizeof(RemoteEndPoint))) == INVALID_SOCKET)
    {
    }
    std::cout << "WINSOCK: 'connect' Return Code: " << WSAGetLastError() << "\r\n";

    //--------------------------------------------
    // Send the Buffer.
    //--------------------------------------------
    // if ((iResult = send(LocalSocket, sendbuf, len, MSG_OOB)) == SOCKET_ERROR)
    char *strPath = "D:/bt.txt";
    const char package[] = 
    /* Connect | 2B of length| OBEX Ver 1.0| Flag| Max Size               */    
      {0x80,    0x00, 0x07,         0x10, 0x00, 2048>>8, 2048&0xFF};

    if ((iResult = send(LocalSocket, package, sizeof(package)/sizeof(char), 0)) == SOCKET_ERROR)
    {
    }
    std::cout << "WINSOCK: 'send' Return Code: " << WSAGetLastError() << "\r\n";

    //--------------------------------------------
    // Receive until the peer termination.
    //--------------------------------------------
    if ((iResult = recv(LocalSocket, recvbuf, recvbuflen, 0)) == SOCKET_ERROR){
        std::cout << "WINSOCK: 'recv' Return Code: " << WSAGetLastError() << "\r\n";
        return -1;
    }
    CString strdata = Byte2Ascn((BYTE*)recvbuf, iResult, 16);
    std::wcout << "recv data: " << (LPCTSTR) strdata << std::endl;
    
    if(0xA0 == static_cast<unsigned char>(recvbuf[0])){
        const char* str = "82002bc30000000f01001100620074002e007400780074000049001268656c6c6f2c20776f726c64200d0a";
                  /* Put | 2B len| HI len | Name|   b   t   .   t   x   t   |HI end|h e l l o ,   w o r l d  \r\n   */    
        int dstlen = strlen((const char*)str)/2;
        BYTE* strdst = (BYTE*)malloc(dstlen * sizeof(BYTE));
        Asc2Byten((void*)str, strdst, dstlen);

        const char package[] = 
        {  
            0x85,0x00,0x08,0x02,0x00,0x01,0x00,0x03
            // 0x82,0x01,0x65,0x01,0x00,0x0F,0x00,0x31,0x00,0x2E,0x00,0x6D,0x00,0x69,0x00,0x64,
            // 0x00,0x00,0xC3,0x00,0x00,0x01,0x39,0x44,0x00,0x12,0x32,0x30,0x30,0x35,0x30,0x32,
            // 0x31,0x34,0x54,0x31,0x39,0x34,0x39,0x33,0x38,0x49,0x01,0x3C,0x4D,0x54,0x68,0x64
            
        };
        if ((iResult = send(LocalSocket, (const char*)strdst, dstlen, 0)) == SOCKET_ERROR)
        {
        }
        std::cout << "WINSOCK: 'send' Return Code: " << WSAGetLastError() << "\r\n";
        delete strdst;

        if ((iResult = recv(LocalSocket, recvbuf, recvbuflen, 0)) == SOCKET_ERROR){
            std::cout << "WINSOCK: 'recv' Return Code: " << WSAGetLastError() << "\r\n";
            return -1;
        }
        strdata = Byte2Ascn((BYTE*)recvbuf, iResult, 16);
        std::wcout << "recv data: " << (LPCTSTR) strdata << std::endl;
    }

    //--------------------------------------------
    // Shutdown the connection.
    //--------------------------------------------
    if ((iResult = shutdown(LocalSocket, SD_SEND)) == SOCKET_ERROR)
    {
    }
    std::cout << "WINSOCK: 'shutdown' Return Code: " << WSAGetLastError() << "\r\n";


    //--------------------------------------------
    // Close the Socket.
    //--------------------------------------------
    if ((iResult = closesocket(LocalSocket)) == SOCKET_ERROR)
    {
    }
    std::cout << "WINSOCK: 'closesocket' Return Code: " << WSAGetLastError() << "\r\n";


    WSACleanup();


    std::cout << "END: " << "Application has completed!" << "\r\n";


    std::getchar();


    return 0;

}