// initializes a GUID from a 873FDF-61A8-11D1-AA5E-00C04FB1728B
private static UsbNativeType.GUID ParseClassGuid(string classGuid)
{
UsbNativeType.GUID guid = new UsbNativeType.GUID();
if ((classGuid == null) && (classGuid == string.Empty))
{
return(guid);
}
string[] data = classGuid.Split('-');
if (data.Length != 5)
{
return(guid);
}
guid.Data1 = Int32.Parse(data[0], System.Globalization.NumberStyles.AllowHexSpecifier);
guid.Data2 = UInt16.Parse(data[1], System.Globalization.NumberStyles.AllowHexSpecifier);
guid.Data3 = UInt16.Parse(data[2], System.Globalization.NumberStyles.AllowHexSpecifier);
guid.data4 = new byte[8];
byte[] dataAux = BitConverter.GetBytes(UInt16.Parse(data[3], System.Globalization.NumberStyles.AllowHexSpecifier));
guid.data4[0] = dataAux[1]; guid.data4[1] = dataAux[0];
dataAux = BitConverter.GetBytes(Int64.Parse(data[4], System.Globalization.NumberStyles.AllowHexSpecifier));
guid.data4[2] = dataAux[5]; guid.data4[3] = dataAux[4];
guid.data4[4] = dataAux[3]; guid.data4[5] = dataAux[2];
guid.data4[6] = dataAux[1]; guid.data4[7] = dataAux[0];
return(guid);
}
public unsafe static List <string> GetDevices(string identification, string classGuid)
{
string devicePath = string.Empty;
int deviceNumber = 0;
int hardwareDevInfo = 0;
UsbNativeType.GUID guid;
List <string> devices = new List <string>();
if (classGuid != null)
{
guid = ParseClassGuid(classGuid);
}
else
{
// falback to human interface devices GUID class
guid = new UsbNativeType.GUID();
UsbNativeApi.HidD_GetHidGuid(ref guid);
}
hardwareDevInfo = UsbNativeApi.SetupDiGetClassDevs(
ref guid,
null,
null,
UsbNativeApi.DIGCF_INTERFACEDEVICE | UsbNativeApi.DIGCF_PRESENT);
// iterate through the available GUID interface devices
while (true)
{
devicePath = GetDevicePath(guid, hardwareDevInfo, deviceNumber);
if ((devicePath == null) || devicePath.Equals(String.Empty))
{
UsbNativeApi.SetupDiDestroyDeviceInfoList(hardwareDevInfo);
return(devices);
}
// get 2Virt devices interfaces only
if ((identification == null) || (devicePath.ToUpper().IndexOf(identification) > 0))
{
devices.Add(devicePath);
}
deviceNumber++;
}
}
private unsafe static string GetDevicePath(UsbNativeType.GUID guid, int hardwareDevInfo, int device_number)
{
int result = 0;
UsbNativeType.SP_DEVICE_INTERFACE_DATA interfaceData = new UsbNativeType.SP_DEVICE_INTERFACE_DATA();
interfaceData.cbSize = Marshal.SizeOf(interfaceData);
// get the device_number device interface
result = UsbNativeApi.SetupDiEnumDeviceInterfaces(
hardwareDevInfo,
0,
ref guid,
device_number,
ref interfaceData);
// get the required size for the device interface system path
int devicePathSize = 0;
result = UsbNativeApi.SetupDiGetDeviceInterfaceDetail(
hardwareDevInfo, // IN HDEVINFO DeviceInfoSet,
ref interfaceData, // IN PSP_DEVICE_INTERFACE_DATA DeviceInterfaceData,
null, // DeviceInterfaceDetailData, OPTIONAL
0, // IN DWORD DeviceInterfaceDetailDataSize,
ref devicePathSize, // OUT PDWORD RequiredSize, OPTIONAL
null); //
// get the actual device interface details
UsbNativeType.PSP_DEVICE_INTERFACE_DETAIL_DATA interfaceDetail = new UsbNativeType.PSP_DEVICE_INTERFACE_DETAIL_DATA();
interfaceDetail.cbSize = 5; // sizeof (SP_DEVICE_INTERFACE_DETAIL_DATA) == 5 in C
result = UsbNativeApi.SetupDiGetDeviceInterfaceDetail(
hardwareDevInfo, // IN HDEVINFO DeviceInfoSet,
ref interfaceData, // IN PSP_DEVICE_INTERFACE_DATA DeviceInterfaceData,
ref interfaceDetail, // DeviceInterfaceDetailData, OPTIONAL
devicePathSize, // IN DWORD DeviceInterfaceDetailDataSize,
ref devicePathSize, // OUT PDWORD RequiredSize, OPTIONAL
null); //
return(interfaceDetail.DevicePath);
}
public static extern unsafe int SetupDiEnumDeviceInterfaces(
int DeviceInfoSet,
int DeviceInfoData,
ref UsbNativeType.GUID lpHidGuid,
int MemberIndex,
ref UsbNativeType.SP_DEVICE_INTERFACE_DATA lpDeviceInterfaceData);
public static extern unsafe int SetupDiGetClassDevs(
ref UsbNativeType.GUID lpHidGuid,
int *Enumerator,
int *hwndParent,
int Flags);
public static extern unsafe void HidD_GetHidGuid(
ref UsbNativeType.GUID lpHidGuid);
