在C#中读取USB扫描枪的信息_c# 通过usb识别不同的扫码枪 csdn

要在C#中读取USB扫描枪的信息，你可以使用HID设备的API。以下是一个示例代码，演示如何在C#中读取USB扫描枪的信息：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Runtime.InteropServices;

class Program
{
    private const int WM_INPUT = 0x00FF;
    private const int RIDEV_INPUTSINK = 0x00000100;
    private const int RIDEV_REMOVE = 0x00000001;

    [StructLayout(LayoutKind.Sequential)]
    public struct RAWINPUTDEVICE
    {
        public ushort usUsagePage;
        public ushort usUsage;
        public uint dwFlags;
        public IntPtr hwndTarget;
    }

    [DllImport("user32.dll")]
    private static extern bool RegisterRawInputDevices(RAWINPUTDEVICE[] pRawInputDevice, uint uiNumDevices, uint cbSize);

    [DllImport("user32.dll")]
    private static extern uint GetRawInputData(IntPtr hRawInput, uint uiCommand, IntPtr pData, ref uint pcbSize, uint cbSizeHeader);

    [DllImport("kernel32.dll", SetLastError = true)]
    private static extern IntPtr GetConsoleWindow();

    static void Main(string[] args)
    {
        // 注册原始输入设备
        RAWINPUTDEVICE[] rawInputDevices = new RAWINPUTDEVICE[1];
        rawInputDevices[0].usUsagePage = 0x01;
        rawInputDevices[0].usUsage = 0x06;
        rawInputDevices[0].dwFlags = RIDEV_INPUTSINK;
        rawInputDevices[0].hwndTarget = GetConsoleWindow();
        RegisterRawInputDevices(rawInputDevices, (uint)rawInputDevices.Length, (uint)Marshal.SizeOf(typeof(RAWINPUTDEVICE)));

        // 获取输入数据
        while (true)
        {
            uint size = 0;
            GetRawInputData(IntPtr.Zero, 0x10000003, IntPtr.Zero, ref size, (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER)));

            IntPtr rawInput = Marshal.AllocHGlobal((int)size);
            try
            {
                GetRawInputData(rawInput, 0x10000003, rawInput, ref size, (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER)));

                // 解析输入数据
                RAWINPUT raw = (RAWINPUT)Marshal.PtrToStructure(rawInput, typeof(RAWINPUT));
                if (raw.header.dwType == 0x0100 && raw.hDevice != IntPtr.Zero)
                {
                    uint dataSize = 0;
                    GetRawInputData(raw.hDevice, 0x10000003, IntPtr.Zero, ref dataSize, (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER)));

                    IntPtr data = Marshal.AllocHGlobal((int)dataSize);
                    try
                    {
                        GetRawInputData(raw.hDevice, 0x10000003, data, ref dataSize, (uint)Marshal.SizeOf(typeof(RAWINPUTHEADER)));

                        RAWINPUTDATA input = (RAWINPUTDATA)Marshal.PtrToStructure(data, typeof(RAWINPUTDATA));
                        Console.WriteLine($"扫描枪数据：{input.keyboard.VKey}");
                    }
                    finally
                    {
                        Marshal.FreeHGlobal(data);
                    }
                }
            }
            finally
            {
                Marshal.FreeHGlobal(rawInput);
            }
        }
    }
}

[StructLayout(LayoutKind.Sequential)]
public struct RAWINPUTHEADER
{
    public uint dwType;
    public uint dwSize;
    public IntPtr hDevice;
    public IntPtr wParam;
}

[StructLayout(LayoutKind.Explicit)]
public struct RAWINPUTDATA
{
    [FieldOffset(0)]
    public RAWKEYBOARD keyboard;
}

[StructLayout(LayoutKind.Sequential)]
public struct RAWKEYBOARD
{
    public ushort MakeCode;
    public ushort Flags;
    public ushort Reserved;
    public ushort VKey;
    public uint Message;
    public uint ExtraInformation;
}

在上述代码中，我们使用了注册原始输入设备的API函数RegisterRawInputDevices来注册HID设备。然后，使用GetRawInputData函数来获取原始输入数据。通过解析原始输入数据，可以获取到扫描枪的键盘码（VKey）。在示例代码中，我们简单地将扫描枪的键盘码输出到控制台。
请注意，由于扫描枪作为HID设备，它的输入数据可能与键盘输入数据混合在一起。因此，在实际应用中，你可能需要根据扫描枪的特定HID设备信息来过滤和处理输入数据。
希望以上信息对你有所帮助！