LibUsbDotNet 2.2.8
IUsbDevice Interface
Library ReferenceLibUsbDotNetIUsbDevice
LibUsbDotNet on SourceForge
The IUsbDevice interface contains members needed to configure a USB device for use.
Declaration Syntax
C#Visual BasicVisual C++
public interface IUsbDevice : IUsbInterface
Public Interface IUsbDevice _
	Inherits IUsbInterface
public interface class IUsbDevice : IUsbInterface
All MembersMethods

Claims the specified interface of the device.

GetAltInterfaceSetting(Byte, Byte%)
Gets the selected alternate interface of the specified interface.

Gets the USB devices active configuration value.

Releases an interface that was previously claimed with ClaimInterface(Int32).

Sends a usb device reset command.

Sets an alternate interface for the most recent claimed interface.

Sets the USB devices active configuration value.

Only "whole" usb devices have a IUsbDevice interface such as a LibUsbDevice or a MonoUsbDevice. This indicates the USB device must be properly configured by the user before it can be used. Partial or interfaces of devices such as a WinUsbDevice do not have an IUsbDevice interface. This indicates that the driver is handling device configuration.
This example uses the IUsbDevice interface to select the desired configuration and interface for usb devices that require it.
using System;
using System.Text;
using System.Text.RegularExpressions;
using LibUsbDotNet;
using LibUsbDotNet.Main;

namespace Examples
    internal class ReadWrite
        public static UsbDevice MyUsbDevice;

        #region SET YOUR USB Vendor and Product ID!

        public static UsbDeviceFinder MyUsbFinder = new UsbDeviceFinder(1234, 1);


        public static void Main(string[] args)
            ErrorCode ec = ErrorCode.None;

                // Find and open the usb device.
                MyUsbDevice = UsbDevice.OpenUsbDevice(MyUsbFinder);

                // If the device is open and ready
                if (MyUsbDevice == null) throw new Exception("Device Not Found.");

                // If this is a "whole" usb device (libusb-win32, linux libusb)
                // it will have an IUsbDevice interface. If not (WinUSB) the 
                // variable will be null indicating this is an interface of a 
                // device.
                IUsbDevice wholeUsbDevice = MyUsbDevice as IUsbDevice;
                if (!ReferenceEquals(wholeUsbDevice, null))
                    // This is a "whole" USB device. Before it can be used, 
                    // the desired configuration and interface must be selected.

                    // Select config #1

                    // Claim interface #0.

                // open read endpoint 1.
                UsbEndpointReader reader = MyUsbDevice.OpenEndpointReader(ReadEndpointID.Ep01);

                // open write endpoint 1.
                UsbEndpointWriter writer = MyUsbDevice.OpenEndpointWriter(WriteEndpointID.Ep01);

                // Remove the exepath/startup filename text from the begining of the CommandLine.
                string cmdLine = Regex.Replace(
                    Environment.CommandLine, "^\".+?\"^.*? |^.*? ", "", RegexOptions.Singleline);

                if (!String.IsNullOrEmpty(cmdLine))
                    int bytesWritten;
                    ec = writer.Write(Encoding.Default.GetBytes(cmdLine), 2000, out bytesWritten);
                    if (ec != ErrorCode.None) throw new Exception(UsbDevice.LastErrorString);

                    byte[] readBuffer = new byte[1024];
                    while (ec == ErrorCode.None)
                        int bytesRead;

                        // If the device hasn't sent data in the last 100 milliseconds,
                        // a timeout error (ec = IoTimedOut) will occur. 
                        ec = reader.Read(readBuffer, 100, out bytesRead);

                        if (bytesRead == 0) throw new Exception("No more bytes!");

                        // Write that output to the console.
                        Console.Write(Encoding.Default.GetString(readBuffer, 0, bytesRead));

                    throw new Exception("Nothing to do.");
            catch (Exception ex)
                Console.WriteLine((ec != ErrorCode.None ? ec + ":" : String.Empty) + ex.Message);
                if (MyUsbDevice != null) 
                    if (MyUsbDevice.IsOpen)
                        // If this is a "whole" usb device (libusb-win32, linux libusb-1.0)
                        // it exposes an IUsbDevice interface. If not (WinUSB) the 
                        // 'wholeUsbDevice' variable will be null indicating this is 
                        // an interface of a device; it does not require or support 
                        // configuration and interface selection.
                        IUsbDevice wholeUsbDevice = MyUsbDevice as IUsbDevice;
                        if (!ReferenceEquals(wholeUsbDevice, null))
                            // Release interface #0.

                    MyUsbDevice = null;

                    // Free usb resources


                // Wait for user input..

Assembly: LibUsbDotNet (Module: LibUsbDotNet) Version: (