使用c#捕获usb扫描枪扫描二维码、条形码结果 |
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目录 中文二维码扫码处理 起因 代码实现 分析需求的不同之处 实现的过程解析 中文二维码扫码处理关于扫描枪对包含中文的二维码扫描的处理，请参考使用c#捕获usb扫描枪扫描二维码、条形码结果（支持中文版），本文之后的评论不再回复关于中文扫码的问题 另外，请仔细阅读本文，因为中文支持博文仅修改了本文中的一个类，其他代码沿用本文 ----------------------------------------------------------------- 起因最近公司买了一些扫描枪，要做个展会门票扫描，门票格式为一个网址，生成方式是qr二维码 以前没玩过这东西，尝试一下看看，结果发现扫描枪根本就是个纯输入设备，和键盘一个性质 好吧，先不管这些，把扫描结果记录下来才是正经的，于是在网上搜了一下“c# winform 无焦点监听键盘输入”，然后一大堆同质化的内容，虽然包含了usb扫描枪数据捕捉，但是。。。。这tmd的全是条形码的！ 好吧，根据这个咱们自己调整调整吧 代码实现先发一个类，用来支持扫描枪扫描结果获取 using System; using System.Collections.Generic; using System.Diagnostics; using System.Runtime.InteropServices; using System.Text; namespace WinForm_Scaner { public class ScanerHook { public delegate void ScanerDelegate(ScanerCodes codes); public event ScanerDelegate ScanerEvent; delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam); private int hKeyboardHook = 0; private ScanerCodes codes = new ScanerCodes(); private HookProc hookproc; [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] private static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId); [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] private static extern bool UnhookWindowsHookEx(int idHook); [DllImport("user32", EntryPoint = "GetKeyNameText")] private static extern int GetKeyNameText(int IParam, StringBuilder lpBuffer, int nSize); [DllImport("user32", EntryPoint = "GetKeyboardState")] private static extern int GetKeyboardState(byte[] pbKeyState); [DllImport("user32", EntryPoint = "ToAscii")] private static extern bool ToAscii(int VirtualKey, int ScanCode, byte[] lpKeySate, ref uint lpChar, int uFlags); [DllImport("kernel32.dll")] public static extern IntPtr GetModuleHandle(string name); public ScanerHook() { } public bool Start() { if (hKeyboardHook == 0) { hookproc = new HookProc(KeyboardHookProc); //GetModuleHandle 函数 替代 Marshal.GetHINSTANCE //防止在 framework4.0中 注册钩子不成功 IntPtr modulePtr = GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName); //WH_KEYBOARD_LL=13 //全局钩子 WH_KEYBOARD_LL // hKeyboardHook = SetWindowsHookEx(13, hookproc, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0); hKeyboardHook = SetWindowsHookEx(13, hookproc, modulePtr, 0); } return (hKeyboardHook != 0); } public bool Stop() { if (hKeyboardHook != 0) { return UnhookWindowsHookEx(hKeyboardHook); } return true; } private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam) { EventMsg msg = (EventMsg)Marshal.PtrToStructure(lParam, typeof(EventMsg)); codes.Add(msg); if (ScanerEvent != null && msg.message == 13 && msg.paramH > 0 && !string.IsNullOrEmpty(codes.Result)) { ScanerEvent(codes); } return 0; } public class ScanerCodes { private int ts = 300; // 指定输入间隔为300毫秒以内时为连续输入 private List _keys = new List(); private List _keydown = new List(); // 保存组合键状态 private List _result = new List(); // 返回结果集 private DateTime _last = DateTime.Now; private byte[] _state = new byte[256]; private string _key = string.Empty; private string _cur = string.Empty; public EventMsg Event { get { if (_keys.Count == 0) { return new EventMsg(); } else { return _keys[_keys.Count - 1][_keys[_keys.Count - 1].Count - 1]; } } } public List KeyDowns { get { return _keydown; } } public DateTime LastInput { get { return _last; } } public byte[] KeyboardState { get { return _state; } } public int KeyDownCount { get { return _keydown.Count; } } public string Result { get { if (_result.Count > 0) { return _result[_result.Count - 1].Trim(); } else { return null; } } } public string CurrentKey { get { return _key; } } public string CurrentChar { get { return _cur; } } public bool isShift { get { return _keydown.Contains(160); } } public void Add(EventMsg msg) { #region 记录按键信息 // 首次按下按键 if (_keys.Count == 0) { _keys.Add(new List()); _keys[0].Add(msg); _result.Add(string.Empty); } // 未释放其他按键时按下按键 else if (_keydown.Count > 0) { _keys[_keys.Count - 1].Add(msg); } // 单位时间内按下按键 else if (((TimeSpan)(DateTime.Now - _last)).TotalMilliseconds < ts) { _keys[_keys.Count - 1].Add(msg); } // 从新记录输入内容 else { _keys.Add(new List()); _keys[_keys.Count - 1].Add(msg); _result.Add(string.Empty); } #endregion _last = DateTime.Now; #region 获取键盘状态 // 记录正在按下的按键 if (msg.paramH == 0 && !_keydown.Contains(msg.message)) { _keydown.Add(msg.message); } // 清除已松开的按键 if (msg.paramH > 0 && _keydown.Contains(msg.message)) { _keydown.Remove(msg.message); } #endregion #region 计算按键信息 int v = msg.message & 0xff; int c = msg.paramL & 0xff; StringBuilder strKeyName = new StringBuilder(500); if (GetKeyNameText(c * 65536, strKeyName, 255) > 0) { _key = strKeyName.ToString().Trim(new char[] { ' ', '\0' }); GetKeyboardState(_state); if (_key.Length == 1 && msg.paramH == 0) { // 根据键盘状态和shift缓存判断输出字符 _cur = ShiftChar(_key, isShift, _state).ToString(); _result[_result.Count - 1] += _cur; } else { _cur = string.Empty; } } #endregion } private char ShiftChar(string k, bool isShiftDown, byte[] state) { bool capslock = state[0x14] == 1; bool numlock = state[0x90] == 1; bool scrolllock = state[0x91] == 1; bool shiftdown = state[0xa0] == 1; char chr = (capslock ? k.ToUpper() : k.ToLower()).ToCharArray()[0]; if (isShiftDown) { if (chr >= 'a' && chr = 'A' && chr |
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