C# Stream 和 byte[] 之间的转换(文件流的应用)

Posted 2020-08-02 落叶的瞬间

一. 二进制转换成图片
MemoryStream ms = new MemoryStream(bytes);

ms.Position = 0;

Image img = Image.FromStream(ms);

ms.Close();

this.pictureBox1.Image

二. C#中byte[]与string的转换代码

1、System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
　　byte[] inputBytes =converter.GetBytes(inputString);
　　string inputString = converter.GetString(inputBytes);

2、string inputString = System.Convert.ToBase64String(inputBytes);
　　byte[] inputBytes = System.Convert.FromBase64String(inputString);

FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);

三. C# Stream 和 byte[] 之间的转换

/// 将 Stream 转成 byte[]

public byte[] StreamToBytes(Stream stream) 

{

byte[] bytes = new byte[stream.Length]; 

stream.Read(bytes, 0, bytes.Length); 

// 设置当前流的位置为流的开始 

stream.Seek(0, SeekOrigin.Begin); 

return bytes; 

}

/// 将 byte[] 转成 Stream

public Stream BytesToStream(byte[] bytes) 

{ 

Stream stream = new MemoryStream(bytes); 

return stream; 

}

四. Stream 和 文件之间的转换

将 Stream 写入文件

public void StreamToFile(Stream stream,string fileName) 

{ 

// 把 Stream 转换成 byte[] 

byte[] bytes = new byte[stream.Length]; 

stream.Read(bytes, 0, bytes.Length); 

// 设置当前流的位置为流的开始 

stream.Seek(0, SeekOrigin.Begin); 

// 把 byte[] 写入文件 

FileStream fs = new FileStream(fileName, FileMode.Create); 

BinaryWriter bw = new BinaryWriter(fs); 

bw.Write(bytes);

bw.Close(); 

fs.Close(); 

}

五. 从文件读取 Stream

public Stream FileToStream(string fileName) 

{ 

// 打开文件 

FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read); 

// 读取文件的 byte[] 

byte[] bytes = new byte[fileStream.Length]; 

fileStream.Read(bytes, 0, bytes.Length); 

fileStream.Close(); 

// 把 byte[] 转换成 Stream 

Stream stream = new MemoryStream(bytes); 

return stream;

}