Stream，byte[]，LZMA
//转自 瓦里奥
一. 二进制转换成图片
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MemoryStream ms = new MemoryStream(bytes);
ms.Position = 0;
Image img = Image.FromStream(ms);
ms.Close();
this.pictureBox1.Image
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二. C#中byte[]与string的转换代码
1.
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System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
byte[] inputBytes =converter.GetBytes(inputString);
string inputString = converter.GetString(inputBytes);
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2.
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string inputString = System.Convert.ToBase64String(inputBytes);
byte[] inputBytes = System.Convert.FromBase64String(inputString);
FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
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三. C# Stream 和 byte[] 之间的转换
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/// 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;
}
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四. Stream 和 文件之间的转换
将 Stream 写入文件
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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();
}
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五. 从文件读取 Stream
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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;
}
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六
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//Bitmap 转化为 Byte[]
Bitmap BitReturn = new Bitmap();
byte[] bReturn = null;
MemoryStream ms = new MemoryStream();
BitReturn.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
bReturn = ms.GetBuffer();
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//from stackoverflow
private static void CompressFileLZMA(string inFile, string outFile) { SevenZip.Compression.LZMA.Encoder coder = new SevenZip.Compression.LZMA.Encoder(); FileStream input = new FileStream(inFile, FileMode.Open); FileStream output = new FileStream(outFile, FileMode.Create); // Write the encoder properties coder.WriteCoderProperties(output); // Write the decompressed file size. output.Write(BitConverter.GetBytes(input.Length), 0, 8); // Encode the file. coder.Code(input, output, input.Length, -1, null); output.Flush(); output.Close(); } private static void DecompressFileLZMA(string inFile, string outFile) { SevenZip.Compression.LZMA.Decoder coder = new SevenZip.Compression.LZMA.Decoder(); FileStream input = new FileStream(inFile, FileMode.Open); FileStream output = new FileStream(outFile, FileMode.Create); // Read the decoder properties byte[] properties = new byte[5]; input.Read(properties, 0, 5); // Read in the decompress file size. byte [] fileLengthBytes = new byte[8]; input.Read(fileLengthBytes, 0, 8); long fileLength = BitConverter.ToInt64(fileLengthBytes, 0); coder.SetDecoderProperties(properties); coder.Code(input, output, input.Length, fileLength, null); output.Flush(); output.Close(); }
public static void Decompress(Stream inStream, Stream outStream){ byte[] properties = new byte[5]; inStream.Read(properties, 0, 5); SevenZip.Compression.LZMA.Decoder decoder = new SevenZip.Compression.LZMA.Decoder(); decoder.SetDecoderProperties(properties); long outSize = 0; for (int i = 0; i < 8; i++) { int v = inStream.ReadByte(); outSize |= ((long)(byte)v) << (8 * i); } long compressedSize = inStream.Length - inStream.Position; decoder.Code(inStream, outStream, compressedSize, outSize, null);}public static string DecompressLzma(string inputstring){ if (!string.IsNullOrEmpty(inputstring)) { byte[] myInts = Array.ConvertAll(inputstring.Split(','), s => (byte)int.Parse(s)); var stream = new MemoryStream(myInts); var outputStream = new MemoryStream(); Decompress(stream, outputStream); using (var reader = new StreamReader(outputStream)) { outputStream.Position = 0; string output = reader.ReadToEnd(); return output; } } return "";}
public static string CompressLzma(string inputstring){ if (!string.IsNullOrEmpty(inputstring)) { var stream = new MemoryStream(Encoding.Unicode.GetBytes(inputstring ?? "")); var outputStream = new MemoryStream(); Compress(stream, outputStream); byte[] bytes = outputStream.ToArray(); } return "";}public static void Compress(MemoryStream inStream, MemoryStream outStream){ CoderPropID[] propIDs; object[] properties; PrepareEncoder(out propIDs, out properties); SevenZip.Compression.LZMA.Encoder encoder = new SevenZip.Compression.LZMA.Encoder(); encoder.SetCoderProperties(propIDs, properties); encoder.WriteCoderProperties(outStream); Int64 fileSize = inStream.Length; for (int i = 0; i < 8; i++) { outStream.WriteByte((Byte)(fileSize >> (8 * i))); } encoder.Code(inStream, outStream, -1, -1, null);}public static void PrepareEncoder(out CoderPropID[] propIDs, out object[] properties){ bool eos = true; Int32 dictionary = 1 << 16; Int32 posStateBits = 2; Int32 litContextBits = 3; // for normal files // UInt32 litContextBits = 0; // for 32-bit data Int32 litPosBits = 0; // UInt32 litPosBits = 2; // for 32-bit data Int32 algorithm = 2; Int32 numFastBytes = 32; string mf = "bt2"; propIDs = new CoderPropID[] { CoderPropID.DictionarySize, CoderPropID.PosStateBits, CoderPropID.LitContextBits, CoderPropID.LitPosBits, CoderPropID.Algorithm, CoderPropID.NumFastBytes, CoderPropID.MatchFinder, CoderPropID.EndMarker }; properties = new object[] { dictionary, posStateBits, litContextBits, litPosBits, algorithm, numFastBytes, mf, eos };}
public static string CompressLzma(string inputstring){ if (!string.IsNullOrEmpty(inputstring)) { var stream = new MemoryStream(Encoding.UTF8.GetBytes(inputstring ?? "")); var outputStream = new MemoryStream(); Compress(stream, outputStream); byte[] bytes = outputStream.ToArray(); var result = string.Join(",", Array.ConvertAll(bytes, v => signedInt((int)v))); return result; } return "";}public static void PrepareEncoder(out CoderPropID[] propIDs, out object[] properties){ bool eos = true; Int32 dictionary = 1 << 16; Int32 posStateBits = 2; Int32 litContextBits = 3; // for normal files // UInt32 litContextBits = 0; // for 32-bit data Int32 litPosBits = 0; // UInt32 litPosBits = 2; // for 32-bit data Int32 algorithm = 2; Int32 numFastBytes = 64; string mf = "bt4"; propIDs = new CoderPropID[] { CoderPropID.DictionarySize, CoderPropID.PosStateBits, CoderPropID.LitContextBits, CoderPropID.LitPosBits, CoderPropID.Algorithm, CoderPropID.NumFastBytes, CoderPropID.MatchFinder, CoderPropID.EndMarker }; properties = new object[] { dictionary, posStateBits, litContextBits, litPosBits, algorithm, numFastBytes, mf, eos };}private static int signedInt(int unsignedInt){ return unsignedInt >= 128 ? Math.Abs(128 - unsignedInt) - 128 : unsignedInt;}public static void Compress(MemoryStream inStream, MemoryStream outStream){ CoderPropID[] propIDs; object[] properties; PrepareEncoder(out propIDs, out properties); SevenZip.Compression.LZMA.Encoder encoder = new SevenZip.Compression.LZMA.Encoder(); encoder.SetCoderProperties(propIDs, properties); encoder.WriteCoderProperties(outStream); Int64 fileSize = inStream.Length; for (int i = 0; i < 8; i++) { outStream.WriteByte((Byte)(fileSize >> (8 * i))); } encoder.Code(inStream, outStream, -1, -1, null);}
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