C#封装USB继电器C++操作类

要控制的东西：

淘宝上面有很多，1路到8路都有。可以通过控制继电器的开关来实现电路管理。

有C++调用的示例。

以下代码百度来的，C#封装了调用的代码：

namespace usb_relay_device{    public static class UsbRelayDevice    { /// <summary>      /// Init the USB Relay Libary      /// </summary>      /// <returns>This function returns 0 on success and -1 on error.</returns>        [DllImport("usb_relay_device.dll", EntryPoint = "usb_relay_init")]        public static extern int Init();        /// <summary>        /// Finalize the USB Relay Libary.        /// This function frees all of the static data associated with        /// USB Relay Libary. It should be called at the end of execution to avoid        /// memory leaks.        /// </summary>        /// <returns>This function returns 0 on success and -1 on error.</returns>        [DllImport("usb_relay_device.dll", EntryPoint = "usb_relay_exit")]        public static extern int Exit();        /// <summary>        /// Enumerate the USB Relay Devices.        /// </summary>        /// <returns></returns>        [DllImport("usb_relay_device.dll", EntryPoint = "usb_relay_device_enumerate")]        public static extern IntPtr usb_relay_device_enumerate();        public static UsbRelayDeviceInfo Enumerate()        {            IntPtr x = UsbRelayDevice.usb_relay_device_enumerate();            UsbRelayDeviceInfo a = (UsbRelayDeviceInfo)Marshal.PtrToStructure(x, typeof(UsbRelayDeviceInfo));            return a;        }        /// <summary>        /// Free an enumeration Linked List        /// </summary>        /// <param name="deviceInfo"></param>        [DllImport("usb_relay_device.dll", EntryPoint = "usb_relay_device_free_enumerate")]        public static extern void FreeEnumerate(UsbRelayDeviceInfo deviceInfo);        /// <summary>        /// Open device that serial number is serialNumber        /// </summary>        /// <param name="serialNumber"></param>        /// <param name="stringLength"></param>        /// <returns>This funcation returns a valid handle to the device on success or NULL on failure.</returns>        [DllImport("usb_relay_device.dll", EntryPoint = "usb_relay_device_open_with_serial_number", CharSet = CharSet.Ansi)]        public static extern int OpenWithSerialNumber([MarshalAs(UnmanagedType.LPStr)] string serialNumber, int stringLength);        /// <summary>        /// Open a usb relay device        /// </summary>        /// <param name="deviceInfo"></param>        /// <returns>This funcation returns a valid handle to the device on success or NULL on failure.</returns>        [DllImport("usb_relay_device.dll", EntryPoint = "usb_relay_device_open")]        public static extern int Open(UsbRelayDeviceInfo deviceInfo);        /// <summary>        /// Close a usb relay device        /// </summary>        /// <param name="hHandle"></param>        [DllImport("usb_relay_device.dll", EntryPoint = "usb_relay_device_close")]        public static extern void Close(int hHandle);        /// <summary>        /// open a relay channel on the USB-Relay-Device        /// </summary>        /// <param name="hHandle">Which usb relay device your want to operate</param>        /// <param name="index">Which channel your want to open</param>        /// <returns>0 -- success; 1 -- error; 2 -- index is outnumber the number of the usb relay device</returns>        [DllImport("usb_relay_device.dll", EntryPoint = "usb_relay_device_open_one_relay_channel")]        public static extern int OpenOneRelayChannel(int hHandle, int index);        /// <summary>        /// open all relay channel on the USB-Relay-Device        /// </summary>        /// <param name="hHandle">which usb relay device your want to operate</param>        /// <returns>0 -- success; 1 -- error</returns>        [DllImport("usb_relay_device.dll", EntryPoint = "usb_relay_device_open_all_relay_channel")]        public static extern int OpenAllRelayChannels(int hHandle);        /// <summary>        /// close a relay channel on the USB-Relay-Device        /// </summary>        /// <param name="hHandle">which usb relay device your want to operate</param>        /// <param name="index">which channel your want to close</param>        /// <returns>0 -- success; 1 -- error; 2 -- index is outnumber the number of the usb relay device</returns>        [DllImport("usb_relay_device.dll", EntryPoint = "usb_relay_device_close_one_relay_channel")]        public static extern int CloseOneRelayChannel(int hHandle, int index);        /// <summary>        /// close all relay channel on the USB-Relay-Device        /// </summary>        /// <param name="hHandle">hich usb relay device your want to operate</param>        /// <returns>0 -- success; 1 -- error</returns>        [DllImport("usb_relay_device.dll", EntryPoint = "usb_relay_device_close_all_relay_channel")]        public static extern int CloseAllRelayChannels(int hHandle);        /// <summary>        /// status bit: High --> Low 0000 0000 0000 0000 0000 0000 0000 0000, one bit indicate a relay status.        /// the lowest bit 0 indicate relay one status, 1 -- means open status, 0 -- means closed status.        /// bit 0/1/2/3/4/5/6/7/8 indicate relay 1/2/3/4/5/6/7/8 status        /// </summary>        /// <param name="hHandle"></param>        /// <param name="status"></param>        /// <returns>0 -- success; 1 -- error</returns>        [DllImport("usb_relay_device.dll", EntryPoint = "usb_relay_device_get_status")]        public static extern int GetStatus(int hHandle, ref int status);    }    /// <summary>    /// USB relay board info structure    /// </summary>    [StructLayout(LayoutKind.Sequential, Pack = 8)]    public class UsbRelayDeviceInfo    {        [MarshalAs(UnmanagedType.LPStr)]        public string SerialNumber;// { get; set; }        //[MarshalAs(UnmanagedType.LPStr)]        public IntPtr DevicePath{ get; set; }        public UsbRelayDeviceType Type { get; set; }        public IntPtr Next { get; set; }    }    public enum UsbRelayDeviceType    {        OneChannel = 1,        TwoChannel = 2,        FourChannel = 4,        EightChannel = 8    }}