网站个人和企业有什么区别,微网站html5模板,沈阳网站建设024idc,支付网站模板1.扫描枪获取数据原理基本相当于键盘数据#xff0c;获取扫描枪扫描出来的数据#xff0c;一般分为两种实现方式。 a#xff09;文本框输入获取焦点#xff0c;扫描后自动显示在文本框内。 b#xff09;使用键盘钩子#xff0c;勾取扫描枪虚拟按键#xff0c;根据按键频…1.扫描枪获取数据原理基本相当于键盘数据获取扫描枪扫描出来的数据一般分为两种实现方式。 a文本框输入获取焦点扫描后自动显示在文本框内。 b使用键盘钩子勾取扫描枪虚拟按键根据按键频率进行手动输入和扫描枪扫描判断。
2.要实现系统钩子其实很简单调用三个Win32的API即可。
SetWindowsHookEx 用于设置钩子。设立一道卡子盘查需要的信息
CallNextHookEx 用于传递钩子消息是重要的所以从哪里来就应该回到哪里去除非你决定要封锁消息
UnhookWindowsHookEx 卸载钩子卸载很重要卡子设多了会造成拥堵
版本一
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Diagnostics;
namespace SaomiaoTest2
{/// summary/// 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/// USB扫描枪 是模拟键盘按下/// 这里主要处理扫描枪的值手动输入的值不太好处理/// /summarypublic class BardCodeHooK{public delegate void BardCodeDeletegate(BarCodes barCode);public event BardCodeDeletegate BarCodeEvent;//定义成静态这样不会抛出回收异常private static HookProc hookproc;public struct BarCodes{public int VirtKey;//虚拟吗public int ScanCode;//扫描码public string KeyName;//键名public uint Ascll;//Ascllpublic char Chr;//字符public string BarCode;//条码信息 保存最终的条码public bool IsValid;//条码是否有效public DateTime Time;//扫描时间,}private struct EventMsg{public int message;public int paramL;public int paramH;public int Time;public int hwnd;}[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.dll, CharSet CharSet.Auto, CallingConvention CallingConvention.StdCall)]private static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);[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);delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);BarCodes barCode new BarCodes();int hKeyboardHook 0;string strBarCode ;private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam){if (nCode 0){EventMsg msg (EventMsg)Marshal.PtrToStructure(lParam, typeof(EventMsg));if (wParam 0x100)//WM_KEYDOWN0x100{barCode.VirtKey msg.message 0xff;//虚拟吗barCode.ScanCode msg.paramL 0xff;//扫描码StringBuilder strKeyName new StringBuilder(225);if (GetKeyNameText(barCode.ScanCode * 65536, strKeyName, 255) 0){barCode.KeyName strKeyName.ToString().Trim(new char[] { , \0 });}else{barCode.KeyName ;}byte[] kbArray new byte[256];uint uKey 0;GetKeyboardState(kbArray);if (ToAscii(barCode.VirtKey, barCode.ScanCode, kbArray, ref uKey, 0)){barCode.Ascll uKey;barCode.Chr Convert.ToChar(uKey);}TimeSpan ts DateTime.Now.Subtract(barCode.Time);if (ts.TotalMilliseconds 50){//时间戳大于50 毫秒表示手动输入strBarCode barCode.Chr.ToString();}else{if ((msg.message 0xff) 13 strBarCode.Length 3){//回车barCode.BarCode strBarCode;barCode.IsValid true;}strBarCode barCode.Chr.ToString();}barCode.Time DateTime.Now;if (BarCodeEvent ! null)BarCodeEvent(barCode);//触发事件barCode.IsValid false;}}return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);}//安装钩子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_LL13//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);}//卸载钩子public bool Stop(){if (hKeyboardHook ! 0){return UnhookWindowsHookEx(hKeyboardHook);}return true;}}
}
在实践过程中发现版本一的代码只能扫描条形码如伴随二维码中的字母出现就不能正确获取数据。
版本二
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Text;namespace BarcodeScanner
{public class ScanerHook{public delegate void ScanerDelegate(ScanerCodes codes);public event ScanerDelegate ScanerEvent;//private const int WM_KEYDOWN 0x100;//KEYDOWN //private const int WM_KEYUP 0x101;//KEYUP //private const int WM_SYSKEYDOWN 0x104;//SYSKEYDOWN //private const int WM_SYSKEYUP 0x105;//SYSKEYUP
//private static int HookProc(int nCode, Int32 wParam, IntPtr lParam);private int hKeyboardHook 0;//声明键盘钩子处理的初始值private ScanerCodes codes new ScanerCodes();//13为键盘钩子//定义成静态这样不会抛出回收异常private static HookProc hookproc;delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);[DllImport(user32.dll, CharSet CharSet.Auto, CallingConvention CallingConvention.StdCall)] //设置钩子private static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);[DllImport(user32.dll, CharSet CharSet.Auto, CallingConvention CallingConvention.StdCall)] //卸载钩子private static extern bool UnhookWindowsHookEx(int idHook);[DllImport(user32.dll, CharSet CharSet.Auto, CallingConvention CallingConvention.StdCall)] //继续下个钩子private static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);[DllImport(user32, EntryPoint GetKeyNameText)]private static extern int GetKeyNameText(int IParam, StringBuilder lpBuffer, int nSize);[DllImport(user32, EntryPoint GetKeyboardState)] //获取按键的状态private static extern int GetKeyboardState(byte[] pbKeyState);[DllImport(user32, EntryPoint ToAscii)] //ToAscii职能的转换指定的虚拟键码和键盘状态的相应字符或字符private static extern bool ToAscii(int VirtualKey, int ScanCode, byte[] lpKeySate, ref uint lpChar, int uFlags); //int VirtualKey //[in] 指定虚拟关键代码进行翻译。 //int uScanCode, // [in] 指定的硬件扫描码的关键须翻译成英文。高阶位的这个值设定的关键如果是不压 //byte[] lpbKeyState, // [in] 指针以256字节数组包含当前键盘的状态。每个元素字节的数组包含状态的一个关键。如果高阶位的字节是一套关键是下跌按下。在低比特如/果设置表明关键是对切换。在此功能只有肘位的CAPS LOCK键是相关的。在切换状态的NUM个锁和滚动锁定键被忽略。 //byte[] lpwTransKey, // [out] 指针的缓冲区收到翻译字符或字符。 //uint fuState); // [in] Specifies whether a menu is active. This parameter must be 1 if a menu is active, or 0 otherwise.[DllImport(kernel32.dll)] //使用WINDOWS API函数代替获取当前实例的函数,防止钩子失效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_LL13 //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){bool retKeyboard UnhookWindowsHookEx(hKeyboardHook);hKeyboardHook 0;return retKeyboard;}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 CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);}public class ScanerCodes{private int ts 100; // 指定输入间隔为300毫秒以内时为连续输入 private ListListEventMsg _keys new ListListEventMsg();private Listint _keydown new Listint(); // 保存组合键状态 private Liststring _result new Liststring(); // 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 Listint 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 ListEventMsg());_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 ListEventMsg());_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)// 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;} // 备选 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 z){chr (char)((int)chr - 32);}else if (chr A chr Z){if (chrZ){string s ;}chr (char)((int)chr 32);} else{ string s 1234567890-[];,./;string u ~!#$%^*()_{}:\?;if (s.IndexOf(chr) 0){return (u.ToCharArray())[s.IndexOf(chr)];}}}return chr;}}public struct EventMsg{public int message;public int paramL;public int paramH;public int Time;public int hwnd;}}
}
版本二中的代码实践中发现出现了获取扫描数据却省略“”加号的情况出现。
因此在版本二中备选处添加
//判断是 强制添加
else if (_key.Length 5 msg.paramH 0msg.paramL78msg.message107)
{// 根据键盘状态和shift缓存判断输出字符 _cur Convert.ToChar().ToString();_result[_result.Count - 1] _cur;
}
3.winform在无焦点情况下的使用方式
using BarcodeScanner;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace BarCodeTest
{public partial class Form1 : Form{private ScanerHook listener new ScanerHook(); public Form1(){InitializeComponent();listener.ScanerEvent Listener_ScanerEvent; }private void Listener_ScanerEvent(ScanerHook.ScanerCodes codes){textBox3.Text codes.Result; } private void Form1_Load(object sender, EventArgs e){listener.Start(); }private void Form1_FormClosed(object sender, FormClosedEventArgs e){listener.Stop(); } }
}
