Bluetooth Virtual Com Port Error 2404

Question

 

I'm trying to connect to a bluetooth device using the RegisterDevice function.  Unfortunately no matter which port I select I always get error code 2404 ERROR_DEVICE_IN_USE.  There is nothing currently connected to the Bluetooth device and no devices already registered to any com port.  Has anyone had this problem before and know of a way to fix it?  I've included the code snippet below.

 

char *Bth::BtRegister(char *DeviceAddress)

   {

   char *Addr = DeviceAddress;

   PORTEMUPortParams pp = {0};

   TCHAR Prefix[5];

   int i;

   pp.channel = 1;

   for (i=0; i<12; ++i, ++Addr){

      int c = *Addr;

      if(c >= 'a') c = c - 'a' + 0xa;

      else if (c >= 'A') c = c - 'A' + 0xa;

      else c = c - '0';

      pp.device = pp.device * 16 + c;

   }

   _tcscpy(Prefix, _T(PORT_PREFIX_BT));

   for(i = 0; i < 5; i++){

      DWORD err;

      BtHandle = RegisterDevice(&Prefix[0],

                                              PORT_SUFFIX_BT,

                                              L"btd.dll",

                                              (DWORD)&pp);

      err = GetLastError();

      if(BtHandle) {

         strcpy(&BtPortName[0], PORT_NAME_BT);

         return &BtPortName[0];

      }

   }

   return 0;

}

Answer 1

 Hi,
Register device should be invoked with the following parameters, Make sure that the variables (&Prefix[0],PORT_SUFFIX_BT and &pp.device) holding correct input.

HbtPrint= RegisterDevice (L"COM", 6, L"btd.dll", (DWORD)&pp);

---

Sree

Answer 2

ok, I know it's probably few months to late but for future reference:

I had the same issue with my bluetooth virtual com ports and it was caused by registering the device using RegisterDevice() and not deregistering it later with UnregisterDevice(). Such device / serial port stay opened until you unregister it, reboot the device or unload/reload the driver perhaps.