DeflateStream.Write Metoda

Definicja

Przestrzeń nazw:

System.IO.Compression

Zestaw:

System.IO.Compression.dll

Przeciążenia

Write(ReadOnlySpan<Byte>)	Zapisuje sekwencję bajtów do bieżącego strumienia Deflate i rozwija bieżącą pozycję w tym strumieniu Deflate o liczbę zapisanych bajtów.
Write(Byte[], Int32, Int32)	Zapisuje skompresowane bajty do bazowego strumienia z określonej tablicy bajtów.

Write(ReadOnlySpan<Byte>)

Źródło:

DeflateStream.cs

Zapisuje sekwencję bajtów do bieżącego strumienia Deflate i rozwija bieżącą pozycję w tym strumieniu Deflate o liczbę zapisanych bajtów.

public:
 override void Write(ReadOnlySpan<System::Byte> buffer);

public override void Write (ReadOnlySpan<byte> buffer);

override this.Write : ReadOnlySpan<byte> -> unit

Public Overrides Sub Write (buffer As ReadOnlySpan(Of Byte))

Parametry

buffer

ReadOnlySpan<Byte>

Region pamięci. Ta metoda kopiuje zawartość tego regionu do bieżącego strumienia Deflate.

Uwagi

CanWrite Użyj właściwości , aby określić, czy bieżące wystąpienie obsługuje zapisywanie. WriteAsync Użyj metody , aby zapisać asynchronicznie do bieżącego strumienia.

Jeśli operacja zapisu zakończy się pomyślnie, pozycja w strumieniu Deflate jest zwiększana o liczbę zapisanych bajtów. Jeśli wystąpi wyjątek, pozycja w strumieniu Deflate pozostaje niezmieniona.

Write(Byte[], Int32, Int32)

Źródło:

DeflateStream.cs

Zapisuje skompresowane bajty do bazowego strumienia z określonej tablicy bajtów.

public:
 override void Write(cli::array <System::Byte> ^ buffer, int offset, int count);

public override void Write (byte[] buffer, int offset, int count);

override this.Write : byte[] * int * int -> unit

Public Overrides Sub Write (buffer As Byte(), offset As Integer, count As Integer)

Parametry

buffer

Byte[]

Bufor zawierający dane do skompresowania.

offset

Int32

Przesunięcie bajtu, z którego będą odczytywane bajty.

count

Int32

Maksymalna liczba bajtów do zapisu.

Uwagi

W poniższym przykładzie pokazano, jak kompresować i dekompresować bajty przy użyciu Read metod i Write .

using System;
using System.IO;
using System.IO.Compression;
using System.Text;

public static class MemoryWriteReadExample
{
    private const string Message = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.";
    private static readonly byte[] s_messageBytes = Encoding.ASCII.GetBytes(Message);

    public static void Run()
    {
        Console.WriteLine($"The original string length is {s_messageBytes.Length} bytes.");
        using var stream = new MemoryStream();
        CompressBytesToStream(stream);
        Console.WriteLine($"The compressed stream length is {stream.Length} bytes.");
        int decompressedLength = DecompressStreamToBytes(stream);
        Console.WriteLine($"The decompressed string length is {decompressedLength} bytes, same as the original length.");
        /*
         Output:
            The original string length is 445 bytes.
            The compressed stream length is 265 bytes.
            The decompressed string length is 445 bytes, same as the original length.
        */
    }

    private static void CompressBytesToStream(Stream stream)
    {
        using var compressor = new DeflateStream(stream, CompressionMode.Compress, leaveOpen: true);
        compressor.Write(s_messageBytes, 0, s_messageBytes.Length);
    }

    private static int DecompressStreamToBytes(Stream stream)
    {
        stream.Position = 0;
        int bufferSize = 512;
        byte[] buffer = new byte[bufferSize];
        using var deflateStream = new DeflateStream(stream, CompressionMode.Decompress);

        int totalRead = 0;
        while (totalRead < buffer.Length)
        {
            int bytesRead = deflateStream.Read(buffer.AsSpan(totalRead));
            if (bytesRead == 0) break;
            totalRead += bytesRead;
        }

        return totalRead;
    }
}

module MemoryWriteReadExample

open System.IO
open System.IO.Compression
open System.Text

let message =
    "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."

let s_messageBytes = Encoding.ASCII.GetBytes message

let compressBytesToStream stream =
    use compressor = new DeflateStream(stream, CompressionMode.Compress, true)
    compressor.Write(s_messageBytes, 0, s_messageBytes.Length)

let decompressStreamToBytes (stream: Stream) =
    stream.Position <- 0
    let bufferSize = 512
    let decompressedBytes = Array.zeroCreate bufferSize
    use decompressor = new DeflateStream(stream, CompressionMode.Decompress)
    decompressor.Read(decompressedBytes, 0, bufferSize)

[<EntryPoint>]
let main _ =
    printfn $"The original string length is {s_messageBytes.Length} bytes."
    use stream = new MemoryStream()
    compressBytesToStream stream
    printfn $"The compressed stream length is {stream.Length} bytes."
    let decompressedLength = decompressStreamToBytes stream
    printfn $"The decompressed string length is {decompressedLength} bytes, same as the original length."
    0

// Output:
//     The original string length is 445 bytes.
//     The compressed stream length is 265 bytes.
//     The decompressed string length is 445 bytes, same as the original length.

Imports System.IO
Imports System.IO.Compression
Imports System.Text

Module MemoryWriteReadExample
    Private Const Message As String = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
    Private ReadOnly s_messageBytes As Byte() = Encoding.ASCII.GetBytes(Message)

    Sub Main()
        Console.WriteLine($"The original string length is {s_messageBytes.Length} bytes.")

        Using stream = New MemoryStream()
            CompressBytesToStream(stream)
            Console.WriteLine($"The compressed stream length is {stream.Length} bytes.")
            Dim decompressedLength As Integer = DecompressStreamToBytes(stream)
            Console.WriteLine($"The decompressed string length is {decompressedLength} bytes, same as the original length.")
        End Using
        ' Output:
        '   The original string length is 445 bytes.
        '   The compressed stream length is 265 bytes.
        '   The decompressed string length is 445 bytes, same as the original length.
    End Sub

    Private Sub CompressBytesToStream(ByVal stream As Stream)
        Using compressor = New DeflateStream(stream, CompressionMode.Compress, leaveOpen:=True)
            compressor.Write(s_messageBytes, 0, s_messageBytes.Length)
        End Using
    End Sub

    Private Function DecompressStreamToBytes(ByVal stream As Stream) As Integer
        stream.Position = 0
        Dim bufferSize As Integer = 512
        Dim decompressedBytes As Byte() = New Byte(bufferSize - 1) {}
        Using decompressor = New DeflateStream(stream, CompressionMode.Decompress)
            Dim length As Integer = decompressor.Read(decompressedBytes, 0, bufferSize)
            Return length
        End Using
    End Function
End Module