AN197

8

Rev. 0.6

portString[0] = '0';

portString[1] = '0';

portString[2] = '0';

portNum = atoi(portString);

}

//Make sure to close all open keys for cleanup

RegCloseKey(tmpPortKey);

}

else

{

portKeyString.Format("Vid_%04x&Pid_%04x\\%s\\Device

Parameters\\",

vid,

pid,

ser);

//If the portkey string is in the registry, then go ahead and open the portname

if

(ERROR_SUCCESS

==

RegOpenKeyEx(tmpSubKey,

portKeyString,

0,

KEY_READ,

&tmpPortKey))

{

if (ERROR_SUCCESS == RegQueryValueEx(tmpPortKey, "PortName", NULL, &valtype,

(unsigned char *)portString, &length))

{

// When we obtain this key, it will be in string format of

// "COMXX" where XX is the port. Simply make the first three

// elements of the string 0, and call the atoi function to obtain

// the number of the port.

portString[0] = '0';

portString[1] = '0';

portString[2] = '0';

portNum = atoi(portString);

}

//Make sure to close all open keys for cleanup

RegCloseKey(tmpPortKey);

}

}

RegCloseKey(tmpSubKey);

}

RegCloseKey(tmpKey);

}

RegCloseKey(HKEY_LOCAL_MACHINE);

delete portString;

// Return the number of the port the device is connected too

return portNum;

}