Encoding.ASCII プロパティ
ASCII (7 ビット) 文字セットのエンコーディングを取得します。
Public Shared ReadOnly Property ASCII As Encoding
[C#]
public static Encoding ASCII {get;}
[C++]
public: __property static Encoding* get_ASCII();
[JScript]
public static function get ASCII() : Encoding;
プロパティ値
ASCII (7 ビット) 文字セットのエンコーディング。
解説
ASCII 文字は、U+0000 から U+007f までの、最小 128 Unicode 文字に限定されます。
使用例
Imports System
Imports System.Text
Imports Microsoft.VisualBasic
Namespace Encoding_Examples
Class EncodingExample
Public Shared Sub Main()
' Create and ASCII encoding.
Dim ascii As Encoding = Encoding.ASCII
' A Unicode string with two characters outside the ASCII code range.
Dim unicodeString As [String] = "This unicode string contains two characters " + "with codes outside the ASCII code range, " + "Pi (" & ChrW(&H03A0) & ") and Sigma (" & ChrW(&H03A3) & ")."
Console.WriteLine("Original string:")
Console.WriteLine(unicodeString)
' Save the positions of the special characters for later reference.
Dim indexOfPi As Integer = unicodeString.IndexOf(ChrW(&H03A0))
Dim indexOfSigma As Integer = unicodeString.IndexOf(ChrW(&H03A3))
' Encode the string.
Dim encodedBytes As [Byte]() = ascii.GetBytes(unicodeString)
Console.WriteLine()
Console.WriteLine("Encoded bytes:")
Dim b As [Byte]
For Each b In encodedBytes
Console.Write("[{0}]", b)
Next b
Console.WriteLine()
' Notice that the special characters have been replaced with
' the value 63, which is the ASCII character code for '?'.
Console.WriteLine()
Console.WriteLine("Value at position of Pi character: {0}", encodedBytes(indexOfPi))
Console.WriteLine("Value at position of Sigma character: {0}", encodedBytes(indexOfSigma))
' Decode bytes back to a string.
' Notice missing Pi and Sigma characters.
Dim decodedString As [String] = ascii.GetString(encodedBytes)
Console.WriteLine()
Console.WriteLine("Decoded bytes:")
Console.WriteLine(decodedString)
End Sub
End Class
End Namespace
[C#]
using System;
using System.Text;
namespace Encoding_Examples
{
using System;
using System.Text;
class EncodingExample
{
public static void Main()
{
// Create an ASCII encoding.
Encoding ascii = Encoding.ASCII;
// A Unicode string with two characters outside the ASCII code range.
String unicodeString =
"This unicode string contains two characters " +
"with codes outside the ASCII code range, " +
"Pi (\u03a0) and Sigma (\u03a3).";
Console.WriteLine("Original string:");
Console.WriteLine(unicodeString);
// Save the positions of the special characters for later reference.
int indexOfPi = unicodeString.IndexOf('\u03a0');
int indexOfSigma = unicodeString.IndexOf('\u03a3');
// Encode the string.
Byte[] encodedBytes = ascii.GetBytes(unicodeString);
Console.WriteLine();
Console.WriteLine("Encoded bytes:");
foreach (Byte b in encodedBytes)
{
Console.Write("[{0}]", b);
}
Console.WriteLine();
// Notice that the special characters have been replaced with
// the value 63, which is the ASCII character code for '?'.
Console.WriteLine();
Console.WriteLine(
"Value at position of Pi character: {0}",
encodedBytes[indexOfPi]
);
Console.WriteLine(
"Value at position of Sigma character: {0}",
encodedBytes[indexOfSigma]
);
// Decode bytes back to a string.
// Notice missing the Pi and Sigma characters.
String decodedString = ascii.GetString(encodedBytes);
Console.WriteLine();
Console.WriteLine("Decoded bytes:");
Console.WriteLine(decodedString);
}
}
}
[C++]
#using <mscorlib.dll>
using namespace System;
using namespace System::Text;
using namespace System::Collections;
int main()
{
// Create an ASCII encoding.
Encoding * ascii = Encoding::ASCII;
// A Unicode String* with two characters outside the ASCII code range.
String * unicodeString =
S"This unicode string contains two characters with codes outside the ASCII code range, Pi (\u03a0) and Sigma (\u03a3).";
Console::WriteLine(S"Original string:");
Console::WriteLine(unicodeString);
// Save the positions of the special characters for later reference.
int indexOfPi = unicodeString -> IndexOf(L'\u03a0');
int indexOfSigma = unicodeString -> IndexOf(L'\u03a3');
// Encode the String*.
Byte encodedBytes[] = ascii -> GetBytes(unicodeString);
Console::WriteLine();
Console::WriteLine(S"Encoded bytes:");
IEnumerator* myEnum = encodedBytes->GetEnumerator();
while (myEnum->MoveNext())
{
Byte b = *__try_cast<Byte __gc*>(myEnum->Current);
Console::Write(S"[{0}]", __box(b));
}
Console::WriteLine();
// Notice that the special characters have been replaced with
// the value 63, which is the ASCII character code for '?'.
Console::WriteLine();
Console::WriteLine(S"Value at position of Pi character: {0}",
encodedBytes->Item[indexOfPi]);
Console::WriteLine(S"Value at position of Sigma character: {0}",
encodedBytes->Item[indexOfSigma]);
// Decode bytes back to String*.
// Notice the missing Pi and Sigma characters.
String * decodedString = ascii -> GetString(encodedBytes);
Console::WriteLine();
Console::WriteLine(S"Decoded bytes:");
Console::WriteLine(decodedString);
}
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必要条件
プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ, .NET Compact Framework - Windows CE .NET, Common Language Infrastructure (CLI) Standard