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  • C#操控条形码扫描枪

    // 条码扫描器
    
    // 窗体部分相关代码:
    
    using System; 
    using System.Collections.Generic;   
    using System.ComponentModel;   
    using System.Data;   
    using System.Drawing;   
    using System.Text;   
    using System.Windows.Forms;   
      
    namespace ReadBadCode   
    {   
        public partial class frmTest : Form   
        {   
            BarCodeHook BarCode = new BarCodeHook();   
            public frmTest()   
            {   
                InitializeComponent();   
                BarCode.BarCodeEvent += new BarCodeHook.BarCodeDelegate(BarCode_BarCodeEvent);   
            }   
      
            private delegate void ShowInfoDelegate(BarCodeHook.BarCodes barCode);   
            private void ShowInfo(BarCodeHook.BarCodes barCode)   
            {   
                if (this.InvokeRequired)   
                {   
                    this.BeginInvoke(new ShowInfoDelegate(ShowInfo), new object[] { barCode });   
                }   
                else  
                {   
                    textBox1.Text = barCode.KeyName;   
                    textBox2.Text = barCode.VirtKey.ToString();   
                    textBox3.Text = barCode.ScanCode.ToString();   
                    textBox4.Text = barCode.AscII.ToString();   
                    textBox5.Text = barCode.Chr.ToString();   
                    textBox6.Text = barCode.IsValid ? barCode.BarCode : "";   
                }   
            }   
      
            void BarCode_BarCodeEvent(BarCodeHook.BarCodes barCode)   
            {   
                ShowInfo(barCode);   
            }   
      
            private void frmTest_Load(object sender, EventArgs e)   
            {   
                BarCode.Start();   
            }   
      
            private void frmTest_FormClosed(object sender, FormClosedEventArgs e)   
            {   
                BarCode.Stop();   
            }   
      
            private void textBox6_TextChanged(object sender, EventArgs e)   
            {   
                if (textBox6.Text.Length > 0)   
                {   
                    MessageBox.Show(textBox6.Text);   
                }   
            }   
        }   
    }   
    
    BarCodeHook  类相关代码:
    
    using System;   
    using System.Collections.Generic;   
    using System.Text;   
    using System.Runtime.InteropServices;   
    using System.Reflection;   
      
    namespace ReadBadCode   
    {   
        public class BarCodeHook   
        {   
            public delegate void BarCodeDelegate(BarCodes barCode);   
            public event BarCodeDelegate BarCodeEvent;   
      
            public struct BarCodes   
            {   
                public int VirtKey;      //虚拟码   
                public int ScanCode;     //扫描码   
                public string KeyName;   //键名   
                public uint AscII;       //AscII   
                public char Chr;         //字符   
      
                public string BarCode;   //条码信息   
                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 lParam, 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[] lpKeyState, ref uint lpChar, int uFlags);   
      
            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_KEYDOWN = 0x100   
                    {   
                        barCode.VirtKey = msg.message & 0xff;  //虚拟码   
                        barCode.ScanCode = msg.paramL & 0xff;  //扫描码   
      
                        StringBuilder strKeyName = new StringBuilder(255);   
                        if (GetKeyNameText(barCode.ScanCode * 65536, strKeyName, 255) > 0)   
                        {   
                            barCode.KeyName = strKeyName.ToString().Trim(new char[] { ' ', '' });   
                        }   
                        else  
                        {   
                            barCode.KeyName = "";   
                        }   
      
                        byte[] kbArray = new byte[256];   
                        uint uKey = 0;   
                        GetKeyboardState(kbArray);                                           
                        if (ToAscii(barCode.VirtKey, barCode.ScanCode, kbArray, ref uKey, 0))   
                        {   
                            barCode.AscII = uKey;   
                            barCode.Chr = Convert.ToChar(uKey);   
                        }   
      
                        if (DateTime.Now.Subtract(barCode.Time).TotalMilliseconds > 50)    
                        {   
                            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)   
                {   
                    //WH_KEYBOARD_LL = 13   
                    hKeyboardHook = SetWindowsHookEx(13, new HookProc(KeyboardHookProc), Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);   
                }   
                return (hKeyboardHook != 0);   
            }   
      
            // 卸载钩子    
            public bool Stop()   
            {   
                if (hKeyboardHook != 0)   
                {   
                    return UnhookWindowsHookEx(hKeyboardHook);   
                }   
                return true;   
            }   
        }   
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  • 原文地址:https://www.cnblogs.com/Alvin-ftd/p/4090679.html
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