红外条码扫描器的另类使用C#版
3年前写了一篇《USB口的红外条形码扫描器的另类使用》,不过相关代码是VB编写,在这几年之间,有许多网友提出需要C#版的,起初还以为由VB修改C#应该很容易,最近研究了一下,发现C#和VB调用API的机制还是有所不同的,在迁移的过程中还是会遇到不少问题,所以我专门抽时间做了一个基于C#的程序。
【目前的条形码扫描器有点类似外接键盘(其实从消息传送上它就相当于一个键盘),把输入焦点定位到可输入的控件上,一扫描相应的条形码信息就输入到文本框中去了,但是如果没有输入焦点,或另一个不相干的程序获得输入焦点,那就有点乱套了。我想实现的是,不管什么情况,只要扫描器一工作,我的程序就能自动激活,并能获得当前输入的条形码信息。 实现思路:我用的是litele牌的USB口的红外条形码扫描器,仔细分析了一下,扫描成功后,以键盘按键消息的形式把条形码输入信息通知给系统。这样通过键盘钩子就可以方便的获得该信息了。但是,怎样区分信息是键盘还是条形码输入的哪?很简单,条形码扫描器在很短的时间内输入了至少3个字符以上信息,并且以“回车”作为结束字符,在这种思想指引下,很完美的实现了预定功能。】
VB相关的代码请见:http://yfsoft.blog.51cto.com/1635641/323475
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窗体相关代码:
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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);
}
}
}
}
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:
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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[] { ' ', '\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.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;
}
}
}
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[] { ' ', '\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.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;
}
}
}
【注意】和VB程序不同,要想测试实际的效果,必须执行编译后的Exe文件,在开发环境直接运行会没有效果的。
转载于:https://blog.51cto.com/yfsoft/323420
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