public static string GetInstanceIDByKeyName(string driverKeyName)
{
var result = string.Empty;
var h = SetupApi.SetupDiGetClassDevs(default(int), UsbConstants.REGSTR_KEY_USB, IntPtr.Zero, UsbConstants.DIGCF_PRESENT | UsbConstants.DIGCF_ALLCLASSES);
if (h.ToInt32() != UsbConstants.INVALID_HANDLE_VALUE)
{
var ptrBuf = Marshal.AllocHGlobal(UsbConstants.BUFFER_SIZE);
var keyName = string.Empty;
var i = default(int);
var success = default(bool);
do
{
var da = new SpDevinfoData();
da.cbSize = Marshal.SizeOf(da);
success = SetupApi.SetupDiEnumDeviceInfo(h, i, ref da);
if (success)
{
var regType = UsbConstants.REG_SZ;
var requiredSize = default(int);
keyName = string.Empty;
if (SetupApi.SetupDiGetDeviceRegistryProperty(h, ref da, UsbConstants.SPDRP_DRIVER, ref regType, ptrBuf, UsbConstants.BUFFER_SIZE, ref requiredSize))
{
keyName = Marshal.PtrToStringAuto(ptrBuf);
}
if (keyName == driverKeyName)
{
var nBytes = UsbConstants.BUFFER_SIZE;
var sb = new StringBuilder(nBytes);
SetupApi.SetupDiGetDeviceInstanceId(h, ref da, sb, nBytes, out requiredSize);
result = sb.ToString();
break;
}
}
i++;
} while (success);
Marshal.FreeHGlobal(ptrBuf);
SetupApi.SetupDiDestroyDeviceInfoList(h);
}
return(result);
}
public static string GetDeviceInstanceId(string enum_device)
// Returns the device instance ID of the specified device
// 'enum_device' should have the following format:
// <enumerator>\<device_id>
{
const int BUFFER_SIZE = 4096;
string enumerator = enum_device.Split(new char[] { '\\' })[0];
StringBuilder deviceInstanceId = new StringBuilder(BUFFER_SIZE);
SetupApi.SP_DEVINFO_DATA devInfoData;
int reqSize;
using (SetupApi.DeviceInfoSet devInfoSet =
new SetupApi.DeviceInfoSet(
IntPtr.Zero,
enumerator,
IntPtr.Zero,
SetupApi.DiGetClassFlags.DIGCF_ALLCLASSES |
SetupApi.DiGetClassFlags.DIGCF_PRESENT))
{
devInfoData = Device.FindInSystem(
enum_device,
devInfoSet,
false
);
if (devInfoData == null)
{
return("");
}
if (!SetupApi.SetupDiGetDeviceInstanceId(
devInfoSet.Get(),
devInfoData,
deviceInstanceId,
BUFFER_SIZE,
out reqSize))
{
Win32Error.Set("SetupDiGetDeviceInstanceId");
throw new Exception(Win32Error.GetFullErrMsg());
}
}
return(deviceInstanceId.ToString());
}
