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using IoTClient.Models;
using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Text;
using System.Threading;
namespace IoTClient
{
/// <summary>
/// SerialPort基类
/// </summary>
public abstract class SerialPortBase
{
/// <summary>
/// 串行端口对象
/// </summary>
protected SerialPort serialPort;
/// <summary>
/// 是否自动打开关闭
/// </summary>
protected bool isAutoOpen = true;
/// <summary>
/// 获取设备上的COM端口集合
/// </summary>
/// <returns></returns>
public static string[] GetPortNames()
{
return SerialPort.GetPortNames();
}
/// <summary>
/// 连接
/// </summary>
/// <returns></returns>
protected Result Connect()
{
var result = new Result();
serialPort?.Close();
try
{
serialPort.Open();
}
catch (Exception ex)
{
if (serialPort?.IsOpen ?? false) serialPort?.Close();
result.IsSucceed = false;
result.Err = ex.Message;
result.ErrCode = 408;
result.Exception = ex;
}
return result.EndTime();
}
/// <summary>
/// 打开连接
/// </summary>
/// <returns></returns>
public Result Open()
{
isAutoOpen = false;
return Connect();
}
/// <summary>
/// 关闭连接
/// </summary>
/// <returns></returns>
protected Result Dispose()
{
var result = new Result();
try
{
serialPort.Close();
}
catch (Exception ex)
{
result.IsSucceed = false;
result.Err = ex.Message;
}
return result;
}
/// <summary>
/// 关闭连接
/// </summary>
/// <returns></returns>
public Result Close()
{
isAutoOpen = true;
return Dispose();
}
/// <summary>
/// 读取
/// </summary>
/// <param name="serialPort"></param>
/// <returns></returns>
protected Result<byte[]> SerialPortRead(SerialPort serialPort)
{
Result<byte[]> result = new Result<byte[]>();
DateTime beginTime = DateTime.Now;
var tempBufferLength = serialPort.BytesToRead;
//在(没有取到数据或BytesToRead在继续读取)且没有超时的情况,延时处理
while ((serialPort.BytesToRead == 0 || tempBufferLength != serialPort.BytesToRead) && DateTime.Now - beginTime <= TimeSpan.FromMilliseconds(serialPort.ReadTimeout))
{
tempBufferLength = serialPort.BytesToRead;
//延时处理
Thread.Sleep(20);
}
byte[] buffer = new byte[serialPort.BytesToRead];
var receiveFinish = 0;
while (receiveFinish < buffer.Length)
{
var readLeng = serialPort.Read(buffer, receiveFinish, buffer.Length);
if (readLeng == 0)
{
result.Value = null;
return result.EndTime();
}
receiveFinish += readLeng;
}
result.Value = buffer;
return result.EndTime();
}
}
}
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