Question

I recently tried to get access to a serial communication using a Bluetooth usb dongle.
I used the C code below, and keep getting error 5, which is “Access denied”. I am the administrator for the system (which seemed to be the common solution to this problem on the forums) and no other application is accessing the same port I am using (also another common solution). I’m running on a Windows Vista Home Basic 32bit system. I was wondering if anyone had a solution for this
My C code is:

HANDLE hComm;

hComm = CreateFile( _T(“\\.\COM3”),
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL);

if (hComm == INVALID_HANDLE_VALUE)
    printf("Error number: %ld\n", GetLastError());
else
    printf("success\n");

Answer 1

Thanks for the tips but it turns out the bluetooth passkey was not set properly and therefore it was denying access to the serial port.