C#键盘钩子问题
最近用网上写的C#键盘钩子获取USB扫描枪条码的一段代码遇到比较头疼的问题，扫描的条码值不对扫描条码“KK25F1840W/019203001156”，用此代码结果是“kkk255F18400w/019203001156”
代码如下:(求高手解答)
BarCodeHook类：
using System.Runtime.InteropServices;
using System.Reflection;
namespace WindowsApplication2
{
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 = "";
}
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;
}
}
}
页面代码：
BarCodeHook BarCode = new BarCodeHook();
public Form2()
{
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 : "";
textBox6.Text = barCode.BarCode;
}
}
void BarCode_BarCodeEvent(BarCodeHook.BarCodes barCode)
{
ShowInfo(barCode);
}
private void Form2_Load(object sender, EventArgs e)
{
BarCode.Start();
}
private void Form2_FormClosed(object sender, FormClosedEventArgs e)
{
BarCode.Stop();
}
--------------------编程问答-------------------- 条码值KK25F1840W/019203001156是哪几个参数？ --------------------编程问答-------------------- ToUpper方法 --------------------编程问答-------------------- 如果只是大小写问题可以
string s = "kkk255F18400w/019203001156".ToUpper(); --------------------编程问答-------------------- 楼主说多个K？ --------------------编程问答-------------------- 是的，有时出现讲1解析成！，将2解析成@…… --------------------编程问答-------------------- 找到问题原因了 谢谢各位@
补充：.NET技术 , C#
