Buffer クラス

定義

プリミティブ型の配列を操作します。Manipulates arrays of primitive types.

public ref class Buffer abstract sealed
[System.Runtime.InteropServices.ComVisible(true)]
public static class Buffer
type Buffer = class
Public Class Buffer
継承
Buffer
属性

次のコード例は、いくつかBufferのクラスメソッドの使用方法を示しています。The following code example illustrates the use of several Buffer class methods.

// Example of the Buffer class methods.
using namespace System;

// Display the array elements from right to left in hexadecimal.
void DisplayArray( array<short>^arr )
{
   Console::Write( "  arr:" );
   for ( int loopX = arr->Length - 1; loopX >= 0; loopX-- )
      Console::Write( " {0:X4}", arr[ loopX ] );
   Console::WriteLine();
}

int main()
{
   
   // This array is to be modified and displayed.
   array<short>^arr = {258,259,260,261,262,263,264,265,266,267,268,269,270,271};
   Console::WriteLine( "This example of the Buffer class "
   "methods generates the following output.\n"
   "Note: The array is displayed from right to left.\n" );
   Console::WriteLine( "Initial values of array:\n" );
   
   // Display the initial array values and ByteLength.
   DisplayArray( arr );
   Console::WriteLine( "\nBuffer::ByteLength( arr ): {0}", Buffer::ByteLength( arr ) );
   
   // Copy a region of the array; set a byte within the array.
   Console::WriteLine( "\nCall these methods: \n"
   "  Buffer::BlockCopy( arr, 5, arr, 16, 9 ),\n"
   "  Buffer::SetByte( arr, 7, 170 ).\n" );
   Buffer::BlockCopy( arr, 5, arr, 16, 9 );
   Buffer::SetByte( arr, 7, 170 );
   
   // Display the array and a byte within the array.
   Console::WriteLine( "Final values of array:\n" );
   DisplayArray( arr );
   Console::WriteLine( "\nBuffer::GetByte( arr, 26 ): {0}", Buffer::GetByte( arr, 26 ) );
}

/*
This example of the Buffer class methods generates the following output.
Note: The array is displayed from right to left.

Initial values of array:

  arr: 010F 010E 010D 010C 010B 010A 0109 0108 0107 0106 0105 0104 0103 0102

Buffer::ByteLength( arr ): 28

Call these methods:
  Buffer::BlockCopy( arr, 5, arr, 16, 9 ),
  Buffer::SetByte( arr, 7, 170 ).

Final values of array:

  arr: 010F 0101 0801 0701 0601 0501 0109 0108 0107 0106 AA05 0104 0103 0102

Buffer::GetByte( arr, 26 ): 15
*/
// Example of the Buffer class methods.
using System;

class BufferClassDemo
{
    // Display the array elements from right to left in hexadecimal.
    public static void DisplayArray( short[ ] arr )
    {
        Console.Write( "  arr:" );
        for( int loopX = arr.Length - 1; loopX >= 0; loopX-- )
            Console.Write( " {0:X4}", arr[ loopX ] );
        Console.WriteLine( );
    }

    public static void Main( )
    {
        // This array is to be modified and displayed.
        short[ ] arr = { 258, 259, 260, 261, 262, 263, 264, 
                         265, 266, 267, 268, 269, 270, 271 };

        Console.WriteLine( "This example of the Buffer class " +
            "methods generates the following output.\n" +
            "Note: The array is displayed from right to left.\n" );
        Console.WriteLine( "Initial values of array:\n" );

        // Display the initial array values and ByteLength.
        DisplayArray( arr );
        Console.WriteLine( "\nBuffer.ByteLength( arr ): {0}", 
            Buffer.ByteLength( arr ) );

        // Copy a region of the array; set a byte within the array.
        Console.WriteLine( "\nCall these methods: \n" +
            "  Buffer.BlockCopy( arr, 5, arr, 16, 9 ),\n" +
            "  Buffer.SetByte( arr, 7, 170 ).\n" );

        Buffer.BlockCopy( arr, 5, arr, 16, 9 );
        Buffer.SetByte( arr, 7, 170 );

        // Display the array and a byte within the array.
        Console.WriteLine( "Final values of array:\n" );
        DisplayArray( arr );
        Console.WriteLine( "\nBuffer.GetByte( arr, 26 ): {0}", 
            Buffer.GetByte( arr, 26 ) );
    }
}

/*
This example of the Buffer class methods generates the following output.
Note: The array is displayed from right to left.

Initial values of array:

  arr: 010F 010E 010D 010C 010B 010A 0109 0108 0107 0106 0105 0104 0103 0102

Buffer.ByteLength( arr ): 28

Call these methods:
  Buffer.BlockCopy( arr, 5, arr, 16, 9 ),
  Buffer.SetByte( arr, 7, 170 ).

Final values of array:

  arr: 010F 0101 0801 0701 0601 0501 0109 0108 0107 0106 AA05 0104 0103 0102

Buffer.GetByte( arr, 26 ): 15
*/
' Example of the Buffer class methods.
Module BufferClassDemo

    ' Display the array elements from right to left in hexadecimal.
    Sub DisplayArray( arr( ) As Short )

        Console.Write( "  arr:" )
        Dim loopX     As Integer
        For loopX = arr.Length - 1 To 0 Step -1
            Console.Write( " {0:X4}", arr( loopX ) )
        Next loopX
        Console.WriteLine( )
    End Sub

    Sub Main( )

        ' This array is to be modified and displayed.
        Dim arr( ) As Short = { 258, 259, 260, 261, 262, 263, 264, _
                                265, 266, 267, 268, 269, 270, 271 }
        Console.WriteLine( _
            "This example of the Buffer class methods generates " & _
            "the following output." & vbCrLf & "Note: The " & _
            "array is displayed from right to left." & vbCrLf )
        Console.WriteLine( "Initial values of array:" & vbCrLf )

        ' Display the initial array values and ByteLength.
        DisplayArray( arr )
        Console.WriteLine( vbCrLf & _
            "Buffer.ByteLength( arr ): {0}", _
            Buffer.ByteLength( arr ) )

        ' Copy a region of the array; set a byte within the array.
        Console.WriteLine( vbCrLf & _
            "Call these methods: " & vbCrLf & _
            "  Buffer.BlockCopy( arr, 5, arr, 16, 9 )," & vbCrLf & _
            "  Buffer.SetByte( arr, 7, 170 )." & vbCrLf )

        Buffer.BlockCopy( arr, 5, arr, 16, 9 )
        Buffer.SetByte( arr, 7, 170 )

        ' Display the array and a byte within the array.
        Console.WriteLine( "Final values of array:" & vbCrLf )
        DisplayArray( arr )
        Console.WriteLine( vbCrLf & _
            "Buffer.GetByte( arr, 26 ): {0}", _
            Buffer.GetByte( arr, 26 ) )
    End Sub 
End Module 

' This example of the Buffer class methods generates the following output.
' Note: The array is displayed from right to left.
' 
' Initial values of array:
' 
'   arr: 010F 010E 010D 010C 010B 010A 0109 0108 0107 0106 0105 0104 0103 0102
' 
' Buffer.ByteLength( arr ): 28
' 
' Call these methods:
'   Buffer.BlockCopy( arr, 5, arr, 16, 9 ),
'   Buffer.SetByte( arr, 7, 170 ).
' 
' Final values of array:
' 
'   arr: 010F 0101 0801 0701 0601 0501 0109 0108 0107 0106 AA05 0104 0103 0102
' 
' Buffer.GetByte( arr, 26 ): 15

注釈

Bufferはプリミティブ型の配列にのみ影響します。このクラスは、オブジェクトには適用されません。Buffer only affects arrays of primitive types; this class does not apply to objects. 各プリミティブ型は、プリミティブ型に関連付けられた動作や制限に関係なく、一連のバイトとして扱われます。Each primitive type is treated as a series of bytes without regard to any behavior or limitation associated with the primitive type.

Bufferプリミティブ型の1つの配列からプリミティブ型の別の配列にバイトをコピーし、配列からバイトを取得し、配列にバイトを設定し、配列の長さを取得するメソッドを提供します。Buffer provides methods to copy bytes from one array of primitive types to another array of primitive types, get a byte from an array, set a byte in an array, and obtain the length of an array. このクラスを使用すると、 System.Arrayクラスの同様のメソッドよりもプリミティブ型を操作する場合のパフォーマンスが向上します。This class provides better performance for manipulating primitive types than similar methods in the System.Array class.

BufferBooleanは、UInt64、、 、UInt16 、、IntPtr 、、、、、の各プリミティブ型に適用されます。 Byte Int16 Char SByte Int32 UInt32 Int64UIntPtr、、および。 Single DoubleBuffer is applicable to the following primitive types: Boolean, Char, SByte, Byte, Int16, UInt16, Int32, UInt32, Int64, UInt64, IntPtr, UIntPtr, Single, and Double.

メソッド

BlockCopy(Array, Int32, Array, Int32, Int32)

コピー先の配列の指定したオフセット位置を先頭として、コピー元の配列の指定したオフセットから指定数のバイトをコピーします。Copies a specified number of bytes from a source array starting at a particular offset to a destination array starting at a particular offset.

ByteLength(Array)

指定した配列のバイト数を返します。Returns the number of bytes in the specified array.

GetByte(Array, Int32)

指定した配列の指定した位置にあるバイトを取得します。Retrieves the byte at the specified location in the specified array.

MemoryCopy(Void*, Void*, Int64, Int64)

長整数値として指定されたバイト数を、メモリ内のアドレス間でコピーします。Copies a number of bytes specified as a long integer value from one address in memory to another.

この API は、CLS に準拠していません。This API is not CLS-compliant.

MemoryCopy(Void*, Void*, UInt64, UInt64)

符号なし長整数値として指定されたバイト数を、メモリ内のアドレス間でコピーします。Copies a number of bytes specified as an unsigned long integer value from one address in memory to another.

この API は、CLS に準拠していません。This API is not CLS-compliant.

SetByte(Array, Int32, Byte)

指定した配列の指定した位置にあるバイトに、指定した値を代入します。Assigns a specified value to a byte at a particular location in a specified array.

適用対象