调用wince扫描机红外扫描

public class CLR_Barcode_1D
    {
        [DllImport("DeviceAPI.dll",EntryPoint="Barcode1D_init")]
        private static extern bool Barcode1D_init();

        [DllImport("DeviceAPI.dll", EntryPoint = "Barcode1D_scan")]
        private static extern int Barcode1D_scan(byte[] pszData);

        [DllImport("DeviceAPI.dll", EntryPoint = "Barcode1D_free")]
        private static extern void Barcode1D_free();

        public static bool Scan(out string barcode)
        {
            Barcode1D_init();
            byte[] pszData = new byte[64];
            int iRes = Barcode1D_scan(pszData);
            Barcode1D_free();
            if (iRes > 0)
            {
                barcode = System.Text.Encoding.GetEncoding(0).GetString(pszData, 0, iRes).Trim();
                if (barcode.Length > 0)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            else
            {
                barcode = string.Empty;
                return false;
            }
        }
    }

string barcode;
                bool result = CLR_Barcode_1D.Scan(out barcode);
                this.txtBarcode.Text = barcode;//扫描结果
                if (result)
                {
                    //TODO
                }