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   源码介绍

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        private void btnRequest_Click(object sender, EventArgs e)
        {
            short icdev = 0x0000;
            int status;
            byte type = (byte)'A';                  //mifare one 卡询卡方式为A
            byte mode = 0x52;
            ushort TagType = 0;
            byte bcnt = 0x04;                        //mifare 卡都用4
            IntPtr pSnr;
            byte len = 255;
            sbyte size = 0;


            if (!bConnectedDevice)
            {
                MessageBox.Show("没有连接设备或没有安装驱动或串口设置错误", "温馨提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            pSnr = Marshal.AllocHGlobal(1024);

            for (int i = 0; i < 2; i  )
            {
                status = rf_antenna_sta(icdev, 0);       //关闭天线
                if (status != 0)
                    continue;

                Sleep(20);
                status = rf_init_type(icdev, type);
                if (status != 0)
                    continue;

                Sleep(20);
                status = rf_antenna_sta(icdev, 1);        //启动天线
                if (status != 0)
                    continue;

                Sleep(50);
                status = rf_request(icdev, mode, ref TagType);          //搜寻所有的卡
                if (status != 0)
                    continue;

                status = rf_anticoll(icdev, bcnt, pSnr, ref len);       //返回卡的序列号
                if (status != 0)
                    continue;

                status = rf_select(icdev, pSnr, len, ref size);         //锁定一张ISO14443-3 TYPE_A 卡
                if (status != 0)
                    continue;

                byte[] szBytes = new byte[len   1];
                string str = Marshal.PtrToStringAnsi(pSnr);

                for (int j = 0; j < len; j  )
                {
                    szBytes[j] = (byte)str[j];
                }
                txtSearchPurse.Text = ToHexString(szBytes);


                break;
            }

            Marshal.FreeHGlobal(pSnr);
        }