vc用微软的bluetooth api如何传送文件

利用微软蓝牙的API,以SOCKET方式，看了例子，现在可以进行数据通讯，但是不知道怎么才可以传文件，代码如下：
SOCKET client_socket = socket (AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM);
if (client_socket!=INVALID_SOCKET)
{
GUID guid_SPP = SerialPortServiceClass_UUID;
SOCKADDR_BTH sa;
memset (&sa, 0, sizeof(sa));
sa.addressFamily=AF_BTH;
sa.btAddr = bd; sa.serviceClassId=OBEXFileTransferServiceClass_UUID;
if (connect (client_socket,(SOCKADDR *)&sa,sizeof(sa)) == SOCKET_ERROR)
{
client_socket = INVALID_SOCKET;
wprintf(L"connet failed %d\r\n",WSAGetLastError());
getch();
return WSAGetLastError();
}

}
iResult=send(client_socket,"hello,from client",100,0);//这是传数据，如何传文件。
if (iResult == SOCKET_ERROR) {
wprintf(L"send() failed with error: %d\n", WSAGetLastError());
closesocket(client_socket);
WSACleanup();
getch();
return 1;
}