调试易

这几天要开发一个程序，用USB二维码扫描器读取中文二文码。基本思路是用虚拟键盘的方式处理，但处理后发现，中文内容全部丢失。谁处理过此类问题。
代码如下
   private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
        {            barCode.IsValid = false;
            bool notChar = false;
            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);//  取得的按键状态中文全部丢失！！！
                   
                    if (ToAscii(barCode.VirtKey, barCode.ScanCode, kbArray, ref uKey, 0))
                    {
                        barCode.AscII = uKey;
                        //Console.WriteLine(uKey);
                        barCode.Chr = Convert.ToChar(uKey);
                    }
                    else
                    {
                        notChar = true;   //转到ascii字符失败，这不是一个正常字符，要去掉
                    }
                    if (DateTime.Now.Subtract(barCode.Time).TotalMilliseconds > 30)     //30ms可以过滤掉连续按住一个键时的情况
                    {
                        if (notChar == false)
                            strBarCode = barCode.Chr.ToString();
                        else
                            strBarCode = "";
                        barCode.IsValid = false;
                    }
                    else
                    {
                        if (strBarCode.Length >= 5)
                        {
                            barCode.IsValid = true;      //isValid为true表明这是个条码
                        }
                        if (notChar == false)
                        {
                            strBarCode += barCode.Chr.ToString();
                        }
                        barCode.BarCode = strBarCode;
                    }                    barCode.Time = DateTime.Now;
                    if (BarCodeEvent != null && barCode.IsValid) BarCodeEvent(barCode);    //触发事件                }
            }
            return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
        }