知识大全 C#操控条形码扫描枪

Posted 2022-07-17 条形码

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　　// 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

　　textBox Text = barCode KeyName;

　　textBox Text = barCode VirtKey ToString();

　　textBox Text = barCode ScanCode ToString();

　　textBox Text = barCode AscII ToString();

　　textBox Text = barCode Chr ToString();

　　textBox 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 textBox _TextChanged(object sender EventArgs e)

　　if (textBox Text Length > )

　　MessageBox Show(textBox 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( user dll CharSet = CharSet Auto CallingConvention = CallingConvention StdCall)]

　　private static extern int SetWindowsHookEx(int idHook HookProc lpfn IntPtr hInstance int threadId);

　　[DllImport( user dll CharSet = CharSet Auto CallingConvention = CallingConvention StdCall)]

　　private static extern bool UnhookWindowsHookEx(int idHook);

　　[DllImport( user dll CharSet = CharSet Auto CallingConvention = CallingConvention StdCall)]

　　private static extern int CallNextHookEx(int idHook int nCode Int wParam IntPtr lParam);

　　[DllImport( user EntryPoint = GetKeyNameText )]

　　private static extern int GetKeyNameText(int lParam StringBuilder lpBuffer int nSize);

　　[DllImport( user EntryPoint = GetKeyboardState )]

　　private static extern int GetKeyboardState(byte[] pbKeyState);

　　[DllImport( user EntryPoint = ToAscii )]

　　private static extern bool ToAscii(int VirtualKey int ScanCode byte[] lpKeyState ref uint lpChar int uFlags);

　　delegate int HookProc(int nCode Int wParam IntPtr lParam);

　　BarCodes barCode = new BarCodes();

　　int hKeyboardHook = ;

　　string strBarCode = ;

　　private int KeyboardHookProc(int nCode Int wParam IntPtr lParam)

　　if (nCode == )

　　EventMsg msg = (EventMsg)Marshal PtrToStructure(lParam typeof(EventMsg));

　　if (wParam == x ) //WM_KEYDOWN = x

　　barCode VirtKey = ssage & xff; //虚拟码

　　barCode ScanCode = msg paramL & xff; //扫描码

　　StringBuilder strKeyName = new StringBuilder( );

　　if (GetKeyNameText(barCode ScanCode * strKeyName ) > )

　　barCode KeyName = strKeyName ToString() Trim(new char[] \\ );

　　else

　　barCode KeyName = ;

　　byte[] kbArray = new byte[ ];

　　uint uKey = ;

　　GetKeyboardState(kbArray);

　　if (ToAscii(barCode VirtKey barCode ScanCode kbArray ref uKey ))

　　barCode AscII = uKey;

　　barCode Chr = Convert ToChar(uKey);

　　if (DateTime Now Subtract(barCode Time) TotalMilliseconds > )

　　strBarCode = barCode Chr ToString();

　　else

　　if ((ssage & xff) == && strBarCode Length > ) //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 == )

　　//WH_KEYBOARD_LL =

　　hKeyboardHook = SetWindowsHookEx( new HookProc(KeyboardHookProc) Marshal GetHINSTANCE(Assembly GetExecutingAssembly() GetModules()[ ]) );

　　return (hKeyboardHook != );

　　// 卸载钩子

　　public bool Stop()

　　if (hKeyboardHook != )

　　return UnhookWindowsHookEx(hKeyboardHook);

　　return true;

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