下面的代码老是报错，哪位有经验的大神帮我看看~
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");
}
}
}
}
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
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