398 lines
12 KiB
C#
398 lines
12 KiB
C#
/******************************************************************************
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* SunnyUI 开源控件库、工具类库、扩展类库、多页面开发框架。
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* CopyRight (C) 2012-2024 ShenYongHua(沈永华).
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* QQ群：56829229 QQ：17612584 EMail：SunnyUI@QQ.Com
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*
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* Blog: https://www.cnblogs.com/yhuse
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* Gitee: https://gitee.com/yhuse/SunnyUI
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* GitHub: https://github.com/yhuse/SunnyUI
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*
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* SunnyUI.dll can be used for free under the GPL-3.0 license.
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* If you use this code, please keep this note.
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* 如果您使用此代码，请保留此说明。
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******************************************************************************
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* 文件名称: UScaner.cs
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* 文件说明: 扫码枪键盘钩子类
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* 当前版本: V3.3
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* 创建日期: 2023-06-17
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*
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* 2023-06-17: V3.3.9 增加文件说明
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******************************************************************************/
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/******************************************************************************
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using Sunny.UI;
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using System.Collections.Concurrent;
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using System;
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public partial class Form1 : UIForm
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{
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private readonly ScanerHook Scaner = new ScanerHook(200, 3);
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private readonly ConcurrentQueue<string> ScanerCodes = new ConcurrentQueue<string>();
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public Form1()
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{
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InitializeComponent();
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Scaner.Start();
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if (Scaner.IsHook) Console.WriteLine("键盘钩子安装成功。");
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Scaner.OnReceiveScanerCodes += Scaner_OnReceiveScanerCodes;
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timer1.Start();
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}
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/// <summary>
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/// 扫码枪扫描结果
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/// </summary>
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/// <param name="codes"></param>
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/// <exception cref="NotImplementedException"></exception>
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private void Scaner_OnReceiveScanerCodes(ScanerCodes codes)
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{
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ScanerCodes.Enqueue(codes.Result);
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Console.WriteLine(codes.Result);
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}
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private void Form1_FormClosed(object sender, System.Windows.Forms.FormClosedEventArgs e)
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{
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timer1.Stop();
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Scaner.Stop();
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}
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private void timer1_Tick(object sender, EventArgs e)
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{
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timer1.Stop();
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while (ScanerCodes.Count > 0)
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{
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if (ScanerCodes.TryDequeue(out var codesresult))
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{
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//使用扫描结果，可以再次以条码规则校验，例如起始字符、长度等
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Text = codesresult;
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}
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}
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timer1.Start();
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}
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}
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******************************************************************************/
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using Sunny.UI.Win32;
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace Sunny.UI
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{
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/// <summary>
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/// 扫码枪键盘钩子类
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/// 扫码枪扫描内容：ASCII字母组合，以回车结束
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/// 指定输入间隔以内时为有效输入，默认200毫秒
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/// </summary>
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public class ScanerHook
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{
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private delegate int HookProc(int nCode, IntPtr wParam, IntPtr lParam);
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public event OnScanerCodes OnReceiveScanerCodes;
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private int idHook = 0;
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private readonly ScanerCodes codes;
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private HookProc hookproc;
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private GCHandle gc;
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//是否安装了钩子
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public bool IsHook { get; private set; } = false;
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[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
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private static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
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[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
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private static extern bool UnhookWindowsHookEx(int idHook);
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[DllImport("user32", EntryPoint = "ToAscii")]
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private static extern bool ToAscii(int VirtualKey, int ScanCode, byte[] lpKeySate, ref uint lpChar, int uFlags);
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[DllImport("kernel32.dll")]
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private static extern IntPtr GetModuleHandle(string name);
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//把击键信息传递到下一个监听键盘事件的应用程序
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[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
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private static extern int CallNextHookEx(int idHook, int nCode, IntPtr wParam, IntPtr lParam);
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private int MinLength { get; set; } = 0;
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private int MaxLength { get; set; } = ushort.MaxValue;
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/// <summary>
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/// 构造函数
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/// </summary>
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/// <param name="timeout">指定输入间隔以内时为有效输入(单位：毫秒)</param>
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/// <param name="minLength">条码最小长度</param>
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/// <param name="maxLength">条码最大长度</param>
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public ScanerHook(int timeout = 200, int minLength = 0, int maxLength = ushort.MaxValue)
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{
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codes = new ScanerCodes(200);
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MinLength = minLength;
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MaxLength = maxLength;
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}
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public bool Start()
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{
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if (idHook == 0)
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{
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hookproc = new HookProc(KeyboardHookProc);
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//GetModuleHandle 函数 替代 Marshal.GetHINSTANCE
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//防止在 framework4.0中 注册钩子不成功
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IntPtr modulePtr = GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName);
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//全局钩子 WH_KEYBOARD_LL = 13
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idHook = SetWindowsHookEx(13, hookproc, modulePtr, 0);
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if (idHook > 0)
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{
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IsHook = true;
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//保持活动 避免 回调过程 被垃圾回收
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gc = GCHandle.Alloc(hookproc);
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}
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else
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{
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IsHook = false;
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UnhookWindowsHookEx(idHook);
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}
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}
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return idHook != 0;
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}
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public bool Stop()
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{
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if (idHook != 0)
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{
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return UnhookWindowsHookEx(idHook);
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}
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return true;
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}
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private int KeyboardHookProc(int nCode, IntPtr wParam, IntPtr lParam)
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{
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EVENTMSG msg = (EVENTMSG)Marshal.PtrToStructure(lParam, typeof(EVENTMSG));
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codes.Add(msg);
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if (OnReceiveScanerCodes != null && msg.message == 13 && msg.paramH > 0 && !string.IsNullOrEmpty(codes.Result))
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{
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if (codes.Result.Length >= MinLength && codes.Result.Length <= MaxLength)
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{
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OnReceiveScanerCodes(codes);
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}
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}
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return CallNextHookEx(idHook, nCode, wParam, lParam);
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}
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}
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public delegate void OnScanerCodes(ScanerCodes codes);
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public class ScanerCodes
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{
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private int ts = 200; //指定输入间隔为200毫秒以内时为有效输入
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private List<List<EVENTMSG>> _keys = new List<List<EVENTMSG>>();
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private List<int> _keydown = new List<int>(); // 保存组合键状态
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private List<string> _result = new List<string>(); // 返回结果集
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private DateTime _last = DateTime.Now;
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private byte[] _state = new byte[256];
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private string _key = string.Empty;
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private string _cur = string.Empty;
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public ScanerCodes(int timeout)
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{
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ts = timeout;
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}
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public EVENTMSG Event
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{
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get
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{
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if (_keys.Count == 0)
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{
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return new EVENTMSG();
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}
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else
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{
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return _keys[_keys.Count - 1][_keys[_keys.Count - 1].Count - 1];
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}
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}
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}
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public List<int> KeyDowns
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{
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get
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{
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return _keydown;
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}
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}
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public DateTime LastInput
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{
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get
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{
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return _last;
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}
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}
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public byte[] KeyboardState
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{
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get
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{
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return _state;
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}
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}
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public int KeyDownCount
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{
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get
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{
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return _keydown.Count;
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}
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}
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public string Result
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{
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get
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{
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if (_result.Count > 0)
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{
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return _result[_result.Count - 1].Trim();
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}
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else
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{
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return null;
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}
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}
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}
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public string CurrentKey
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{
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get
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{
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return _key;
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}
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}
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public string CurrentChar
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{
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get
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{
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return _cur;
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}
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}
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public bool isShift
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{
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get
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{
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return _keydown.Contains(160);
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}
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}
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public void Add(EVENTMSG msg)
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{
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#region 记录按键信息
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if (_keys.Count == 0)
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{
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// 首次按下按键
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_keys.Add(new List<EVENTMSG>());
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_keys[0].Add(msg);
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_result.Add(string.Empty);
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}
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else if (_keydown.Count > 0)
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{
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// 未释放其他按键时按下按键
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_keys[_keys.Count - 1].Add(msg);
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}
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else if ((DateTime.Now - _last).TotalMilliseconds < ts)
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{
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// 单位时间内按下按键
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_keys[_keys.Count - 1].Add(msg);
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}
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else
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{
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// 从新记录输入内容
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_keys.Add(new List<EVENTMSG>());
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_keys[_keys.Count - 1].Add(msg);
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_result.Add(string.Empty);
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}
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#endregion
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_last = DateTime.Now;
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#region 获取键盘状态
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// 记录正在按下的按键
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if (msg.paramH == 0 && !_keydown.Contains(msg.message))
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{
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_keydown.Add(msg.message);
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}
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// 清除已松开的按键
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if (msg.paramH > 0 && _keydown.Contains(msg.message))
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{
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_keydown.Remove(msg.message);
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}
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#endregion
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#region 计算按键信息
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int v = msg.message & 0xff;
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int c = msg.paramL & 0xff;
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StringBuilder strKeyName = new StringBuilder(500);
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if (GetKeyNameText(c * 65536, strKeyName, 255) > 0)
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{
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_key = strKeyName.ToString().Trim(new char[] { ' ', '\0' });
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GetKeyboardState(_state);
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if (_key.Length == 1 && msg.paramH == 0)
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{
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// 根据键盘状态和shift缓存判断输出字符
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_cur = ShiftChar(_key, isShift, _state).ToString();
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_result[_result.Count - 1] += _cur;
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}
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else
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{
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_cur = string.Empty;
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}
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}
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#endregion
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}
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[DllImport("user32", EntryPoint = "GetKeyNameText")]
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private static extern int GetKeyNameText(int IParam, StringBuilder lpBuffer, int nSize);
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[DllImport("user32", EntryPoint = "GetKeyboardState")]
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private static extern int GetKeyboardState(byte[] pbKeyState);
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private char ShiftChar(string k, bool isShiftDown, byte[] state)
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{
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bool capslock = state[0x14] == 1;
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bool numlock = state[0x90] == 1;
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bool scrolllock = state[0x91] == 1;
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bool shiftdown = state[0xa0] == 1;
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char chr = (capslock ? k.ToUpper() : k.ToLower()).ToCharArray()[0];
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if (isShiftDown)
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{
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if (chr >= 'a' && chr <= 'z')
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{
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chr = (char)(chr - 32);
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}
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else if (chr >= 'A' && chr <= 'Z')
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{
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chr = (char)(chr + 32);
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}
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else
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{
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string s = "`1234567890-=[];',./";
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string u = "~!@#$%^&*()_+{}:\"<>?";
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if (s.IndexOf(chr) >= 0)
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{
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return (u.ToCharArray())[s.IndexOf(chr)];
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}
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}
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}
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return chr;
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}
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}
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} |