public static extern Boolean SetupDiEnumDeviceInterfaces(
IntPtr hDevInfo,
IntPtr devInfo,
ref Guid interfaceClassGuid,
int memberIndex,
ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData
);
public static extern bool SetupDiGetDeviceInterfaceDetail(
IntPtr hDevInfo,
ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData,
IntPtr deviceInterfaceDetailData,
int deviceInterfaceDetailDataSize,
out int requiredSize,
ref SP_DEVINFO_DATA deviceInfoData
);
public IList<string> FindDevices()
{
IList<string> deviceNames = new List<string>();
Guid hidGuid = new Guid();
Hid.HidD_GetHidGuid(ref hidGuid);
uint flags = (uint) (DiGetClassFlags.DIGCF_PRESENT | DiGetClassFlags.DIGCF_DEVICEINTERFACE);
IntPtr pnpHandle = IntPtr.Zero;
try
{
pnpHandle = SetupApi.SetupDiGetClassDevs(ref hidGuid, IntPtr.Zero, IntPtr.Zero, flags);
SP_DEVICE_INTERFACE_DATA data = new SP_DEVICE_INTERFACE_DATA();
data.cbSize = Marshal.SizeOf(data);
int devIndex = 0;
bool success = false;
do
{
success = SetupApi.SetupDiEnumDeviceInterfaces(pnpHandle, IntPtr.Zero, ref hidGuid, devIndex,
ref data);
if (success)
{
SP_DEVINFO_DATA devData = new SP_DEVINFO_DATA();
devData.cbSize = Marshal.SizeOf(devData);
int bytesReturned;
SetupApi.SetupDiGetDeviceInterfaceDetail(pnpHandle, ref data, IntPtr.Zero, 0, out bytesReturned,
ref devData);
if (bytesReturned != 0 && Marshal.GetLastWin32Error() == ErrorCodes.ERROR_INSUFFICIENT_BUFFER)
{
unsafe
{
IntPtr deviceInterfaceDetailData = Marshal.AllocHGlobal(bytesReturned);
SP_DEVICE_INTERFACE_DETAIL_DATA* interfaceData =
(SP_DEVICE_INTERFACE_DETAIL_DATA*) deviceInterfaceDetailData.ToPointer();
interfaceData->cbSize = sizeof (SP_DEVICE_INTERFACE_DETAIL_DATA);
if (SetupApi.SetupDiGetDeviceInterfaceDetail(pnpHandle, ref data,
deviceInterfaceDetailData,
bytesReturned,
out bytesReturned, ref devData))
{
IntPtr devicePathTchar = IntPtr.Add(deviceInterfaceDetailData, sizeof (int));
string devicePath = Marshal.PtrToStringAuto(devicePathTchar);
deviceNames.Add(devicePath);
}
Marshal.FreeHGlobal(deviceInterfaceDetailData);
}
}
}
++devIndex;
} while (success);
return deviceNames;
}
finally
{
if (pnpHandle != IntPtr.Zero)
{
SetupApi.SetupDiDestroyDeviceInfoList(pnpHandle);
}
}
}
