chutian_terminal/tool/scanner/QRCodeScanner.cs

using System;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using tool;

namespace tool
{
    public class QRCodeScanner : ScannerInterface
    {
        Vbarapi vbarapi;
        string decoderesult = string.Empty;
        bool m_statu;
        public QRCodeScanner()
        {
            m_statu = false;
            //this.vbarapi = vbarapi;
            vbarapi = new Vbarapi();
            if (vbarapi.openDevice())
            {
                //StatusSettings.scanStatus = true;
                Log.Instance.WriteLog(LogType.PROCESS, LogFile.LOG, "扫描设备连接成功");
            }
            else
            {
                //StatusSettings.scanStatus = false;
                Log.Instance.WriteLog(LogType.PROCESS, LogFile.LOG, "扫描设备连接失败");
            }
            vbarapi.backlight(true);//打开背光
            vbarapi.controlScan(true);//打开扫码            
        }

        public void ScanInit()
        {
            m_statu = true;
        }

        private string Decoder()
        {
            byte[] result;
            string sResult = null;
            int size;
            if (vbarapi.getResultStr(out result, out size))
            {
                Log.Instance.WriteLog(LogType.PROCESS, LogFile.LOG, "vbar扫描结果：" + result);
                //以默认的方式读取结果字节
                string msg = System.Text.Encoding.UTF8.GetString(result);
                byte[] buffer = Encoding.UTF8.GetBytes(msg);
                sResult = Encoding.UTF8.GetString(buffer, 0, buffer.Length);
            }
            else
            {
                Log.Instance.WriteLog(LogType.PROCESS, LogFile.LOG, "vbar未扫描到结果");
                sResult = null;
            }
            return sResult;
        }

        public string Decode()
        {
            Task decodeTask = Task.Factory.StartNew(() =>
            {
                ScanInit();
                while (m_statu)
                {
                    decoderesult = Decoder();
                    //if (!(decoderesult.Length == 0))
                    if (decoderesult != null && decoderesult != "" && decoderesult != string.Empty)
                    {
                        Log.Instance.WriteLog(LogType.PROCESS, LogFile.LOG, "扫描结果：" + decoderesult);
                        break;
                    }
                    Thread.Sleep(200);
                }
            });
            decodeTask.Wait();
            return decoderesult;
        }

        public void Close()
        {
            vbarapi.backlight(false);//关闭背光
            vbarapi.controlScan(false);//关闭扫码
        }
    }
}