Base64FormattingOptions 列挙体とは何？わかりやすく解説 Weblio辞書

すべての辞書から再検索する

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

Base64FormattingOptions 列挙体

メモ : この列挙体は、.NET Framework version 2.0 で新しく追加されたものです。

関連する System.Convert.ToBase64CharArray メソッドと System.Convert.ToBase64String メソッドで、それぞれの出力に改行を挿入するかどうかを指定します。

この列挙体には、メンバ値のビットごとの組み合わせを可能にする FlagsAttribute 属性が含まれています。

名前空間: System
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

<FlagsAttribute> _
Public Enumeration Base64FormattingOptions

Visual Basic (使用法)

Dim instance As Base64FormattingOptions

[FlagsAttribute] 
public enum Base64FormattingOptions

C++

[FlagsAttribute] 
public enum class Base64FormattingOptions

/** @attribute FlagsAttribute() */ 
public enum Base64FormattingOptions

JScript

FlagsAttribute 
public enum Base64FormattingOptions

メンバ

	メンバ名	説明
	InsertLineBreaks	文字列形式で 76 文字ごとに改行を挿入します。
	None	文字列形式で 76 文字ごとに改行を挿入しません。

解説

ToBase64CharArray メソッドと ToBase64String メソッドは、8 ビット符号なし整数配列の値を、base 64 の数字で構成される等価の文字列形式に変換します。この文字列形式には、1 つ以上の改行を含めることができます。この改行は、復帰文字 (U+000D) とその後に続くラインフィード文字 (U+000A) として定義されます。

使用例

Base64FormattingOptions 列挙体を使用して、System.Convert.ToBase64String メソッドの出力を個別の行に改行するコード例を次に示します。

Visual Basic

' This example demonstrates the Convert.ToBase64String() and 
'                               Convert.FromBase64String() methods
Imports System

Class Sample
   Public Shared Sub Main()
      Dim inArray(255)  As Byte
      Dim outArray(255) As Byte
      Dim s2 As String
      Dim s3 As String
      Dim step1 As String
 = "1) The input is a byte array (inArray) of arbitrary data."
      Dim step2 As String
 = "2) Convert a subarray of the input data array to a base 64
 string."
      Dim step3 As String
 = "3) Convert the entire input data array to a base 64 string."
      Dim step4 As String
 = "4) The two methods in steps 2 and 3 produce the same result?:
 {0}"
      Dim step5 As String
 = "5) Convert the base 64 string to an output byte array (outArray)."
      Dim step6 As String
 = "6) The input and output arrays, inArray and outArray, are
 equal?: {0}"
      Dim x As Integer
      Dim nl As String =
 Environment.NewLine
      Dim ruler1a As String
 = "         1         2         3         4"
      Dim ruler2a As String
 = "1234567890123456789012345678901234567890"
      Dim ruler3a As String
 = "----+----+----+----+----+----+----+----+"
      Dim ruler1b As String
 = "         5         6         7      "
      Dim ruler2b As String
 = "123456789012345678901234567890123456"
      Dim ruler3b As String
 = "----+----+----+----+----+----+----+-"
      Dim ruler As String
 = [String].Concat(ruler1a, ruler1b, nl, ruler2a, ruler2b, nl, ruler3a, ruler3b,
 nl)
      
      ' 1) Display an arbitrary array of input data (inArray). The data
 could be 
      '    derived from user input, a file, an algorithm, etc.
      Console.WriteLine(step1)
      Console.WriteLine()
      For x = 0 To inArray.Length - 1
         inArray(x) = CByte(x)
         Console.Write("{0:X2} ", inArray(x))
         If (x + 1) Mod 20 = 0 Then
            Console.WriteLine()
         End If
      Next x
      Console.Write("{0}{0}", nl)
      
      ' 2) Convert a subarray of the input data to a base64 string.
 In this case, 
      '    the subarray is the entire input data array. New lines (CRLF)
 are inserted.
      Console.WriteLine(step2)
      s2 = Convert.ToBase64String(inArray, 0, inArray.Length, _
                                  Base64FormattingOptions.InsertLineBreaks)
      Console.WriteLine("{0}{1}{2}{3}", nl, ruler,
 s2, nl)
      
      ' 3) Convert the input data to a base64 string. In this case,
 the entire 
      '    input data array is converted by default. New lines (CRLF)
 are inserted.
      Console.WriteLine(step3)
      s3 = Convert.ToBase64String(inArray, Base64FormattingOptions.InsertLineBreaks)
      
      ' 4) Test whether the methods in steps 2 and 3 produce the same
 result.
      Console.WriteLine(step4, s2.Equals(s3))
      
      ' 5) Convert the base 64 string to an output array (outArray).
      Console.WriteLine(step5)
      outArray = Convert.FromBase64String(s2)
      
      ' 6) Is outArray equal to inArray?
      Console.WriteLine(step6, ArraysAreEqual(inArray, outArray))
   End Sub 'Main
   
   
   Public Shared Function
 ArraysAreEqual(a1() As Byte, a2() As
 Byte) As Boolean
      If a1.Length <> a2.Length Then
         Return False
      End If
      Dim i As Integer
      For i = 0 To a1.Length - 1
         If a1(i) <> a2(i) Then
            Return False
         End If
      Next i
      Return True
   End Function 'ArraysAreEqual
End Class 'Sample
'
'This example produces the following results:
'
'1) The input is a byte array (inArray) of arbitrary data.
'
'00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
'14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
'28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
'3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
'50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
'64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
'78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
'8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
'A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
'B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
'C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
'DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
'F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF
'
'2) Convert a subarray of the input data array to a base 64 string.
'
'         1         2         3         4         5         6      
   7
'1234567890123456789012345678901234567890123456789012345678901234567890123456
'----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
'AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
'OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
'cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
'q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
'5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==
'
'3) Convert the entire input data array to a base 64 string.
'4) The two methods in steps 2 and 3 produce the same result?: True
'5) Convert the base 64 string to an output byte array (outArray).
'6) The input and output arrays, inArray and outArray, are equal?: True
'

// This example demonstrates the Convert.ToBase64String() and 
//                               Convert.FromBase64String() methods

using System;
class Sample 
{
    public static void Main()
 
    {
    byte[] inArray  = new byte[256];
    byte[] outArray = new byte[256];
    string s2;
    string s3;
    string step1 = "1) The input is a byte array (inArray)
 of arbitrary data.";
    string step2 = "2) Convert a subarray of the input data
 array to a base 64 string.";
    string step3 = "3) Convert the entire input data array
 to a base 64 string.";
    string step4 = "4) The two methods in
 steps 2 and 3 produce the same result?: {0}";
    string step5 = "5) Convert the base
 64 string to an output byte array (outArray).";
    string step6 = "6) The input and output arrays, inArray
 and outArray, are equal?: {0}";
    int x;
    string nl = Environment.NewLine;
    string ruler1a = "         1         2         3    
     4";
    string ruler2a = "1234567890123456789012345678901234567890";
    string ruler3a = "----+----+----+----+----+----+----+----+";
    string ruler1b = "         5         6         7    
  ";
    string ruler2b = "123456789012345678901234567890123456";
    string ruler3b = "----+----+----+----+----+----+----+-";
    string ruler   = String.Concat(ruler1a, ruler1b, nl, 
                                   ruler2a, ruler2b, nl,
                                   ruler3a, ruler3b, nl);

// 1) Display an arbitrary array of input data (inArray). The data could
 be 
//    derived from user input, a file, an algorithm, etc.

    Console.WriteLine(step1);
    Console.WriteLine();
    for (x = 0; x < inArray.Length; x++)
        {
        inArray[x] = (byte)x;
        Console.Write("{0:X2} ", inArray[x]);
        if (((x+1)%20) == 0) Console.WriteLine();
        }
    Console.Write("{0}{0}", nl);

// 2) Convert a subarray of the input data to a base64 string. In this
 case, 
//    the subarray is the entire input data array. New lines (CRLF)
 are inserted.

    Console.WriteLine(step2);
    s2 = Convert.ToBase64String(inArray, 0, inArray.Length, 
                                Base64FormattingOptions.InsertLineBreaks);
    Console.WriteLine("{0}{1}{2}{3}", nl, ruler, s2, nl);

// 3) Convert the input data to a base64 string. In this case, the entire
 
//    input data array is converted by default. New lines (CRLF) are
 inserted.

    Console.WriteLine(step3);
    s3 = Convert.ToBase64String(inArray, Base64FormattingOptions.InsertLineBreaks);

// 4) Test whether the methods in steps 2 and 3 produce the same result.
    Console.WriteLine(step4, s2.Equals(s3));

// 5) Convert the base 64 string to an output array (outArray).
    Console.WriteLine(step5);
    outArray = Convert.FromBase64String(s2);

// 6) Is outArray equal to inArray?
   Console.WriteLine(step6, ArraysAreEqual(inArray, outArray));
   }

    public static bool ArraysAreEqual(byte[]
 a1, byte[] a2)
    {
    if (a1.Length != a2.Length) return false;
    for (int i = 0; i < a1.Length; i++)
        if (a1[i] != a2[i]) return false;
    return true;
    }
}
/*
This example produces the following results:

1) The input is a byte array (inArray) of arbitrary data.

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF

2) Convert a subarray of the input data array to a base 64 string.

         1         2         3         4         5         6         7
1234567890123456789012345678901234567890123456789012345678901234567890123456
----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==

3) Convert the entire input data array to a base 64 string.
4) The two methods in steps 2 and 3 produce the same result?:
 True
5) Convert the base 64 string to an output
 byte array (outArray).
6) The input and output arrays, inArray and outArray, are equal?: True

*/

プラットフォーム

バージョン情報

.NET Framework
サポート対象 : 2.0

関連項目
System 名前空間

このページでは「.NET Framework クラスライブラリリファレンス」からBase64FormattingOptions 列挙体を検索した結果を表示しています。
Weblioに収録されているすべての辞書からBase64FormattingOptions 列挙体を検索する場合は、下記のリンクをクリックしてください。

全ての辞書からBase64FormattingOptions 列挙体を検索

>> 「Base64FormattingOptions 列挙体」を含む用語の索引
Base64FormattingOptions 列挙体のページへのリンク

Base64FormattingOptions 列挙体とは？わかりやすく解説

Base64FormattingOptions 列挙体

「Base64FormattingOptions 列挙体」の関連用語


	© 2025 Microsoft.All rights reserved.

Base64FormattingOptions 列挙体とは？ わかりやすく解説

Base64FormattingOptions 列挙体

急上昇のことば

「Base64FormattingOptions 列挙体」の関連用語

Base64FormattingOptions 列挙体とは？わかりやすく解説