using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace Expert.Untity
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{
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public class FileTransferHelper
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{
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/// <summary>
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/// 流转化为字节 (方法内会释放流)
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/// </summary>
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public static byte[] Stream2Bytes(Stream stream)
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{
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if (stream == null)
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return null;
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byte[] bytes = new byte[stream.Length];
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stream.Seek(0, SeekOrigin.Begin);
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stream.Read(bytes, 0, bytes.Length);
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stream.Close();
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return bytes;
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}
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/// <summary>
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/// 流转化为字节 (方法内不会释放流)
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/// </summary>
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public static byte[] Stream2Bytes2(Stream stream)
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{
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if (stream == null)
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return null;
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byte[] bytes = new byte[stream.Length];
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stream.Seek(0, SeekOrigin.Begin);
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stream.Read(bytes, 0, bytes.Length);
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return bytes;
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}
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/// <summary>
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/// 字节转化为流
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/// </summary>
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public static Stream Bytes2Stream(byte[] bytes)
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{
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if (bytes == null)
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return null;
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Stream stream = new MemoryStream(bytes);
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return stream;
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}
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/// <summary>
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/// 字节保存至路径
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/// </summary>
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public static void Bytes2File(byte[] bytes, string path)
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{
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FileStream fs = new FileStream(path, FileMode.Create);
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fs.Write(bytes, 0, bytes.Length);
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fs.Dispose();
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}
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/// <summary>
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/// 文件转化为流
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/// </summary>
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public static Stream File2Stream(string filePath)
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{
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try
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{
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if (filePath == null)
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return null;
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if (!System.IO.File.Exists(filePath))
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return null;
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//必须先转成byte,否则出了using后，流会关闭
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byte[] bs = null;
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using (FileStream stream = new FileStream(filePath, FileMode.Open))
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{
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bs = Stream2Bytes(stream);
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}
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if (bs == null || bs.Count() == 0)
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return null;
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else
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return new MemoryStream(bs);
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}
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catch (Exception)
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{
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return null;
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}
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}
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/// <summary>
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/// 文件转化为字节
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/// </summary>
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public static byte[] File2Bytes(string filePath)
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{
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try
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{
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//System.IO.File.WriteAllBytes 也可以
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if (filePath == null)
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return null;
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if (!System.IO.File.Exists(filePath))
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return null;
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//必须先转成byte,否则出了using后，流会关闭
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byte[] bs = null;
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using (FileStream stream = new FileStream(filePath, FileMode.Open))
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{
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bs = Stream2Bytes(stream);
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}
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if (bs == null || bs.Count() == 0)
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return null;
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else
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return bs;
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}
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catch (Exception)
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{
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return null;
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}
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}
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/// <summary>
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/// 流变成文件 (方法内会释放流)
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/// </summary>
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public static void Stream2File(Stream fileStream, string fileFullName)
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{
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//判断文件是否可读
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if (!fileStream.CanRead)
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{
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throw new Exception("数据流不可读!");
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}
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//从开始读起
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if (fileStream.Position != 0)
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fileStream.Position = 0;
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//文件流传输
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FileStream targetStream = null;
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int fileSize = 0;
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using (targetStream = new FileStream(fileFullName, FileMode.Create, FileAccess.Write, FileShare.None))
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{
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//定义文件缓冲区
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const int bufferLen = 4096;
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byte[] buffer = new byte[bufferLen];
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int count = 0;
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while ((count = fileStream.Read(buffer, 0, bufferLen)) > 0)
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{
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targetStream.Write(buffer, 0, count);
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fileSize += count;
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}
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targetStream.Close();
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fileStream.Close();
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}
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}
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/// <summary>
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/// 流变成文件 (方法内不会释放流)
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/// </summary>
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public static void Stream2File2(Stream fileStream, string fileFullName)
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{
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//判断文件是否可读
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if (!fileStream.CanRead)
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{
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throw new Exception("数据流不可读!");
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}
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//从开始读起
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if (fileStream.Position != 0)
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fileStream.Position = 0;
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//文件流传输
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FileStream targetStream = null;
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int fileSize = 0;
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using (targetStream = new FileStream(fileFullName, FileMode.Create, FileAccess.Write, FileShare.None))
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{
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//定义文件缓冲区
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const int bufferLen = 4096;
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byte[] buffer = new byte[bufferLen];
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int count = 0;
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while ((count = fileStream.Read(buffer, 0, bufferLen)) > 0)
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{
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targetStream.Write(buffer, 0, count);
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fileSize += count;
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}
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targetStream.Close();
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}
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}
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}
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}
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