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最近在做个国外很火的项目,碰到一些问题,下面的代码老是报错,哪位有经验的大神帮我看看~
扫描器是优力科的MS3398下面是扫描器的参数API http://www.posunitech.com/products_detail/productId=83.html
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Runtime.InteropServices;
- using System.Text;
- namespace Common
- {
- public class BardCodeHooK
- {
- public delegate void BardCodeDeletegate(BarCodes barCode);
- public event BardCodeDeletegate BarCodeEvent;
- public struct BarCodes
- {
- public int VirtKey;//虚拟吗
- public int ScanCode;//扫描码
- public string KeyName;//键名
- public uint Ascll;//Ascll
- 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 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);
- 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)
- {
- strBarCode = barCode.Chr.ToString();
- }
- else
- {
- if ((msg.message & 0xff) == 13 && strBarCode.Length > 3)
- {
- 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;
- }
- }
- }
- 页面中用法:
- using System;
- using System.Collections.Generic;
- using System.ComponentModel;
- using System.Data;
- using System.Drawing;
- using System.Text;
- using System.Windows.Forms;
- namespace Common
- {
- public partial class FrmMain : Form
- {
- BardCodeHooK BarCode = new BardCodeHooK();
- public FrmMain()
- {
- InitializeComponent();
- BarCode.BarCodeEvent += new BardCodeHooK.BardCodeDeletegate(BarCode_BarCodeEvent);
- }
- private delegate void ShowInfoDelegate(BardCodeHooK.BarCodes barCode);
- private void ShowInfo(BardCodeHooK.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.Ascll.ToString();
- textBox5.Text = barCode.Chr.ToString();
- textBox6.Text = barCode.IsValid? barCode.BarCode : "";//是否为扫描枪输入,如果为true则是 否则为键盘输入
- textBox7.Text += barCode.KeyName;
- //MessageBox.Show(barCode.IsValid.ToString());
- }
- }
- //C#中判断扫描枪输入与键盘输入
- //Private DateTime _dt = DateTime.Now; //定义一个成员函数用于保存每次的时间点
- //private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
- //{
- // DateTime tempDt = DateTime.Now; //保存按键按下时刻的时间点
- // TimeSpan ts = tempDt .Subtract(_dt); //获取时间间隔
- // if (ts.Milliseconds > 50) //判断时间间隔,如果时间间隔大于50毫秒,则将TextBox清空
- // textBox1.Text = "";
- // dt = tempDt ;
- //}
- void BarCode_BarCodeEvent(BardCodeHooK.BarCodes barCode)
- {
- ShowInfo(barCode);
- }
- private void FrmMain_Load(object sender, EventArgs e)
- {
- BarCode.Start();
- }
- private void FrmMain_FormClosed(object sender, FormClosedEventArgs e)
- {
- BarCode.Stop();
- }
- private void textBox6_TextChanged(object sender, EventArgs e)
- {
- if (textBox6.Text.Length > 0)
- {
- MessageBox.Show("条码长度:" + textBox6.Text.Length + "\n条码内容:" + textBox6.Text, "系统提示");
- }
- }
- }
- }
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