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237 lines
6.5 KiB
237 lines
6.5 KiB
using System;
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using System.Diagnostics;
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using System.Reflection;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace BO
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{
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/// <summary>
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/// 获取键盘输入或者USB扫描枪数据 可以是没有焦点 应为使用的是全局钩子
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/// USB扫描枪 是模拟键盘按下
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/// 这里主要处理扫描枪的值，手动输入的值不太好处理
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/// </summary>
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public class BardCodeHooK
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{
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public delegate void BardCodeDeletegate(BarCodes barCode);
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public event BardCodeDeletegate BarCodeEvent;
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//定义成静态，这样不会抛出回收异常
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private static HookProc hookproc;
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public struct BarCodes
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{
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public int VirtKey;//虚拟吗
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public int ScanCode;//扫描码
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public string KeyName;//键名
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public uint Ascll;//Ascll
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public char Chr;//字符
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public string OriginalChrs; //原始 字符
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public string OriginalAsciis;//原始 ASCII
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public string OriginalBarCode; //原始数据条码
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public bool IsValid;//条码是否有效
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public DateTime Time;//扫描时间,
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public string BarCode;//条码信息 保存最终的条码
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}
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private struct EventMsg
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{
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public int message;
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public int paramL;
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public int paramH;
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public int Time;
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public int hwnd;
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}
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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.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
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private static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);
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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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[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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public static extern IntPtr GetModuleHandle(string name);
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delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);
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BarCodes barCode = new BarCodes();
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int hKeyboardHook = 0;
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// string strBarCode = "";
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StringBuilder sbBarCode = new StringBuilder();
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private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
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{
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int i_calledNext = -10;
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if (nCode == 0)
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{
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EventMsg msg = (EventMsg)Marshal.PtrToStructure(lParam, typeof(EventMsg));
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if (wParam == 0x100)//WM_KEYDOWN=0x100
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{
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barCode.VirtKey = msg.message & 0xff;//虚拟吗
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barCode.ScanCode = msg.paramL & 0xff;//扫描码
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byte[] kbArray = new byte[256];
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uint uKey = 0;
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GetKeyboardState(kbArray);
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// if (barCode.KeyName.Equals("A") || barCode.KeyName.Equals("a"))
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// {
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if (ToAscii(barCode.VirtKey, barCode.ScanCode, kbArray, ref uKey, 0))
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{
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barCode.Ascll = uKey;
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barCode.Chr = Convert.ToChar(uKey);
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barCode.OriginalChrs += " " + Convert.ToString(barCode.Chr);
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barCode.OriginalAsciis += " " + Convert.ToString(barCode.Ascll);
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barCode.OriginalBarCode += Convert.ToString(barCode.Chr);
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}
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// }
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TimeSpan ts = DateTime.Now.Subtract(barCode.Time);
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if (ts.TotalMilliseconds > 50)
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{//时间戳，大于50 毫秒表示手动输入
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sbBarCode.Remove(0, sbBarCode.Length);
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sbBarCode.Append(barCode.Chr.ToString());
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barCode.OriginalChrs = " " + Convert.ToString(barCode.Chr);
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barCode.OriginalAsciis = " " + Convert.ToString(barCode.Ascll);
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barCode.OriginalBarCode = Convert.ToString(barCode.Chr);
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}
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else
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{
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if ((msg.message & 0xff) == 13 && sbBarCode.Length > 3)
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{
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//回车
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// barCode.BarCode = barCode.OriginalBarCode.Replace("\r","").Replace("\t","");
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barCode.BarCode = barCode.OriginalBarCode;
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barCode.IsValid = true;
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sbBarCode.Remove(0, sbBarCode.Length);
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}
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Debug.Print(sbBarCode.ToString()+ " "+ barCode.Chr.ToString());
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sbBarCode.Append(barCode.Chr.ToString());
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}
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try
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{
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if (BarCodeEvent != null && barCode.IsValid)
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{
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//barCode.BarCode = barCode.BarCode.Replace("\b", "").Replace("\0",""); 可以不需要 因为大于50毫秒已经处理
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//先进行 WINDOWS事件往下传
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i_calledNext = CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
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BarCodeEvent(barCode);//触发事件
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barCode.BarCode = "";
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barCode.OriginalChrs = "";
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barCode.OriginalAsciis = "";
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barCode.OriginalBarCode = "";
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}
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}
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catch { }
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finally
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{
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barCode.IsValid = false; //最后一定要 设置barCode无效
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barCode.Time = DateTime.Now;
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}
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}
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}
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if (i_calledNext == -10)
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{
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i_calledNext = CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
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}
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return i_calledNext;
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}
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//安装钩子
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public bool Start()
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{
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if (hKeyboardHook == 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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var moduleName1 = Process.GetCurrentProcess().MainModule.ModuleName;
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var moduleName = Assembly.GetExecutingAssembly().ManifestModule.Name;
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IntPtr modulePtr = GetModuleHandle(moduleName1);
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//WH_KEYBOARD_LL=13
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//全局钩子 WH_KEYBOARD_LL
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// hKeyboardHook = SetWindowsHookEx(13, hookproc, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
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hKeyboardHook = SetWindowsHookEx(13, hookproc, modulePtr, 0);
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}
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return (hKeyboardHook != 0);
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}
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//卸载钩子
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public bool Stop()
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{
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if (hKeyboardHook != 0)
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{
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return UnhookWindowsHookEx(hKeyboardHook);
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}
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return true;
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}
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}
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}
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