BitConverter.ToDouble メソッド
定義
重要
一部の情報は、リリース前に大きく変更される可能性があるプレリリースされた製品に関するものです。 Microsoft は、ここに記載されている情報について、明示または黙示を問わず、一切保証しません。
オーバーロード
| ToDouble(ReadOnlySpan<Byte>) |
読み取り専用のバイト スパンを倍精度浮動小数点の値に変換します。 |
| ToDouble(Byte[], Int32) |
バイト配列内の指定位置にある 8 バイトから変換された倍精度浮動小数点数を返します。 |
ToDouble(ReadOnlySpan<Byte>)
読み取り専用のバイト スパンを倍精度浮動小数点の値に変換します。
public:
static double ToDouble(ReadOnlySpan<System::Byte> value);public static double ToDouble (ReadOnlySpan<byte> value);static member ToDouble : ReadOnlySpan<byte> -> doublePublic Shared Function ToDouble (value As ReadOnlySpan(Of Byte)) As Doubleパラメーター
- value
- ReadOnlySpan<Byte>
変換するバイトを含む読み取り専用のスパン。
戻り値
変換されたバイトを表す倍精度浮動小数点の値。
例外
value の長さが Double の値の長さを下回っています。
適用対象
ToDouble(Byte[], Int32)
バイト配列内の指定位置にある 8 バイトから変換された倍精度浮動小数点数を返します。
public:
static double ToDouble(cli::array <System::Byte> ^ value, int startIndex);public static double ToDouble (byte[] value, int startIndex);static member ToDouble : byte[] * int -> doublePublic Shared Function ToDouble (value As Byte(), startIndex As Integer) As Doubleパラメーター
- value
- Byte[]
変換する 8 バイトを含むバイトの配列。
- startIndex
- Int32
value 内の開始位置。
戻り値
で始まる startIndex8 バイトで形成された倍精度浮動小数点数。
例外
startIndex が value の長さから 7 を引いた値以上で、value の長さから 1 を引いた値以下です。
value が nullです。
startIndex が 0 未満か、value の長さから 1 を引いた値より大きい値です。
例
次のコード例では、メソッドを使用して配列のByte要素を値にDoubleToDouble変換します。
// Example of the BitConverter::ToDouble method.
using namespace System;
// Convert eight byte array elements to a double and display it.
void BAToDouble( array<unsigned char>^bytes, int index )
{
double value = BitConverter::ToDouble( bytes, index );
Console::WriteLine( "{0,5}{1,27}{2,27:E16}", index, BitConverter::ToString( bytes, index, 8 ), value );
}
// Display a byte array, using multiple lines if necessary.
void WriteMultiLineByteArray( array<unsigned char>^bytes )
{
const int rowSize = 20;
int iter;
Console::WriteLine( "initial unsigned char array" );
Console::WriteLine( "---------------------------" );
for ( iter = 0; iter < bytes->Length - rowSize; iter += rowSize )
{
Console::Write( BitConverter::ToString( bytes, iter, rowSize ) );
Console::WriteLine( "-" );
}
Console::WriteLine( BitConverter::ToString( bytes, iter ) );
Console::WriteLine();
}
int main()
{
array<unsigned char>^byteArray = {0,0,0,0,0,0,0,0,240,63,0,0,0,0,0,224,111,64,0,0,224,255,255,255,239,65,0,0,0,0,0,0,112,63,0,0,0,0,0,0,240,61,223,136,30,28,254,116,170,1,250,89,140,66,202,192,243,63,251,89,140,66,202,192,243,63,252,89,140,66,202,192,243,63,82,211,187,188,232,126,61,126,255,255,255,255,255,255,239,255,255,255,255,255,255,239,127,1,0,0,0,0,0,0,0,248,255,0,0,0,0,0,0,240,255,0,0,0,0,0,0,240,127};
Console::WriteLine( "This example of the BitConverter::ToDouble( unsigned "
"char[ ], int ) \nmethod generates the following output. It "
"converts elements of a \nbyte array to double values.\n" );
WriteMultiLineByteArray( byteArray );
Console::WriteLine( "{0,5}{1,27}{2,27:E16}", "index", "array elements", "double" );
Console::WriteLine( "{0,5}{1,27}{2,27:E16}", "-----", "--------------", "------" );
// Convert byte array elements to double values.
BAToDouble( byteArray, 0 );
BAToDouble( byteArray, 2 );
BAToDouble( byteArray, 10 );
BAToDouble( byteArray, 18 );
BAToDouble( byteArray, 26 );
BAToDouble( byteArray, 34 );
BAToDouble( byteArray, 42 );
BAToDouble( byteArray, 50 );
BAToDouble( byteArray, 58 );
BAToDouble( byteArray, 66 );
BAToDouble( byteArray, 74 );
BAToDouble( byteArray, 82 );
BAToDouble( byteArray, 89 );
BAToDouble( byteArray, 97 );
BAToDouble( byteArray, 99 );
BAToDouble( byteArray, 107 );
BAToDouble( byteArray, 115 );
}
/*
This example of the BitConverter.ToDouble( byte( ), int )
method generates the following output. It converts elements
of a byte array to double values.
initial byte array
------------------
00-00-00-00-00-00-00-00-F0-3F-00-00-00-00-00-E0-6F-40-00-00-
E0-FF-FF-FF-EF-41-00-00-00-00-00-00-70-3F-00-00-00-00-00-00-
F0-3D-DF-88-1E-1C-FE-74-AA-01-FA-59-8C-42-CA-C0-F3-3F-FB-59-
8C-42-CA-C0-F3-3F-FC-59-8C-42-CA-C0-F3-3F-52-D3-BB-BC-E8-7E-
3D-7E-FF-FF-FF-FF-FF-FF-EF-FF-FF-FF-FF-FF-FF-EF-7F-01-00-00-
00-00-00-00-00-F8-FF-00-00-00-00-00-00-F0-FF-00-00-00-00-00-
00-F0-7F
index array elements double
----- -------------- ------
0 00-00-00-00-00-00-00-00 0.0000000000000000E+000
2 00-00-00-00-00-00-F0-3F 1.0000000000000000E+000
10 00-00-00-00-00-E0-6F-40 2.5500000000000000E+002
18 00-00-E0-FF-FF-FF-EF-41 4.2949672950000000E+009
26 00-00-00-00-00-00-70-3F 3.9062500000000000E-003
34 00-00-00-00-00-00-F0-3D 2.3283064365386963E-010
42 DF-88-1E-1C-FE-74-AA-01 1.2345678901234500E-300
50 FA-59-8C-42-CA-C0-F3-3F 1.2345678901234565E+000
58 FB-59-8C-42-CA-C0-F3-3F 1.2345678901234567E+000
66 FC-59-8C-42-CA-C0-F3-3F 1.2345678901234569E+000
74 52-D3-BB-BC-E8-7E-3D-7E 1.2345678901234569E+300
82 FF-FF-FF-FF-FF-FF-EF-FF -1.7976931348623157E+308
89 FF-FF-FF-FF-FF-FF-EF-7F 1.7976931348623157E+308
97 01-00-00-00-00-00-00-00 4.9406564584124654E-324
99 00-00-00-00-00-00-F8-FF NaN
107 00-00-00-00-00-00-F0-FF -Infinity
115 00-00-00-00-00-00-F0-7F Infinity
*/
// Example of the BitConverter.ToDouble method.
using System;
class BytesToDoubleDemo
{
const string formatter = "{0,5}{1,27}{2,27:E16}";
// Convert eight byte array elements to a double and display it.
public static void BAToDouble( byte[ ] bytes, int index )
{
double value = BitConverter.ToDouble( bytes, index );
Console.WriteLine( formatter, index,
BitConverter.ToString( bytes, index, 8 ), value );
}
// Display a byte array, using multiple lines if necessary.
public static void WriteMultiLineByteArray( byte[ ] bytes )
{
const int rowSize = 20;
int iter;
Console.WriteLine( "initial byte array" );
Console.WriteLine( "------------------" );
for( iter = 0; iter < bytes.Length - rowSize; iter += rowSize )
{
Console.Write(
BitConverter.ToString( bytes, iter, rowSize ) );
Console.WriteLine( "-" );
}
Console.WriteLine( BitConverter.ToString( bytes, iter ) );
Console.WriteLine( );
}
public static void Main( )
{
byte[ ] byteArray = {
0, 0, 0, 0, 0, 0, 0, 0, 240, 63,
0, 0, 0, 0, 0, 224, 111, 64, 0, 0,
224, 255, 255, 255, 239, 65, 0, 0, 0, 0,
0, 0, 112, 63, 0, 0, 0, 0, 0, 0,
240, 61, 223, 136, 30, 28, 254, 116, 170, 1,
250, 89, 140, 66, 202, 192, 243, 63, 251, 89,
140, 66, 202, 192, 243, 63, 252, 89, 140, 66,
202, 192, 243, 63, 82, 211, 187, 188, 232, 126,
61, 126, 255, 255, 255, 255, 255, 255, 239, 255,
255, 255, 255, 255, 255, 239, 127, 1, 0, 0,
0, 0, 0, 0, 0, 248, 255, 0, 0, 0,
0, 0, 0, 240, 255, 0, 0, 0, 0, 0,
0, 240, 127 };
Console.WriteLine(
"This example of the BitConverter.ToDouble( byte[ ], " +
"int ) \nmethod generates the following output. It " +
"converts elements \nof a byte array to double values.\n" );
WriteMultiLineByteArray( byteArray );
Console.WriteLine( formatter, "index", "array elements",
"double" );
Console.WriteLine( formatter, "-----", "--------------",
"------" );
// Convert byte array elements to double values.
BAToDouble( byteArray, 0 );
BAToDouble( byteArray, 2 );
BAToDouble( byteArray, 10 );
BAToDouble( byteArray, 18 );
BAToDouble( byteArray, 26 );
BAToDouble( byteArray, 34 );
BAToDouble( byteArray, 42 );
BAToDouble( byteArray, 50 );
BAToDouble( byteArray, 58 );
BAToDouble( byteArray, 66 );
BAToDouble( byteArray, 74 );
BAToDouble( byteArray, 82 );
BAToDouble( byteArray, 89 );
BAToDouble( byteArray, 97 );
BAToDouble( byteArray, 99 );
BAToDouble( byteArray, 107 );
BAToDouble( byteArray, 115 );
}
}
/*
This example of the BitConverter.ToDouble( byte[ ], int )
method generates the following output. It converts elements
of a byte array to double values.
initial byte array
------------------
00-00-00-00-00-00-00-00-F0-3F-00-00-00-00-00-E0-6F-40-00-00-
E0-FF-FF-FF-EF-41-00-00-00-00-00-00-70-3F-00-00-00-00-00-00-
F0-3D-DF-88-1E-1C-FE-74-AA-01-FA-59-8C-42-CA-C0-F3-3F-FB-59-
8C-42-CA-C0-F3-3F-FC-59-8C-42-CA-C0-F3-3F-52-D3-BB-BC-E8-7E-
3D-7E-FF-FF-FF-FF-FF-FF-EF-FF-FF-FF-FF-FF-FF-EF-7F-01-00-00-
00-00-00-00-00-F8-FF-00-00-00-00-00-00-F0-FF-00-00-00-00-00-
00-F0-7F
index array elements double
----- -------------- ------
0 00-00-00-00-00-00-00-00 0.0000000000000000E+000
2 00-00-00-00-00-00-F0-3F 1.0000000000000000E+000
10 00-00-00-00-00-E0-6F-40 2.5500000000000000E+002
18 00-00-E0-FF-FF-FF-EF-41 4.2949672950000000E+009
26 00-00-00-00-00-00-70-3F 3.9062500000000000E-003
34 00-00-00-00-00-00-F0-3D 2.3283064365386963E-010
42 DF-88-1E-1C-FE-74-AA-01 1.2345678901234500E-300
50 FA-59-8C-42-CA-C0-F3-3F 1.2345678901234565E+000
58 FB-59-8C-42-CA-C0-F3-3F 1.2345678901234567E+000
66 FC-59-8C-42-CA-C0-F3-3F 1.2345678901234569E+000
74 52-D3-BB-BC-E8-7E-3D-7E 1.2345678901234569E+300
82 FF-FF-FF-FF-FF-FF-EF-FF -1.7976931348623157E+308
89 FF-FF-FF-FF-FF-FF-EF-7F 1.7976931348623157E+308
97 01-00-00-00-00-00-00-00 4.9406564584124654E-324
99 00-00-00-00-00-00-F8-FF NaN
107 00-00-00-00-00-00-F0-FF -Infinity
115 00-00-00-00-00-00-F0-7F Infinity
*/
open System
let print obj1 obj2 obj3 = printfn $"{obj1,5}{obj2,27}{obj3,27:E16}"
// Convert eight byte array elements to a double and display it.
let BAToDouble bytes index =
let value = BitConverter.ToDouble(bytes, index)
print index (BitConverter.ToString(bytes, index, 8)) value
// Display a byte array, using multiple lines if necessary.
let writeMultiLineByteArray (bytes: byte []) =
let rowSize = 20
printfn "initial byte array"
printfn "------------------"
let mutable iter = 0
for i in 0 .. rowSize .. (bytes.Length - rowSize - 1) do
printfn $"{BitConverter.ToString(bytes, iter, rowSize)}-"
iter <- i
printfn $"{BitConverter.ToString(bytes, iter + rowSize)}\n"
let byteArray =
[| 0uy; 0uy; 0uy; 0uy; 0uy; 0uy; 0uy; 0uy; 240uy; 63uy
0uy; 0uy; 0uy; 0uy; 0uy; 224uy; 111uy; 64uy; 0uy; 0uy;
224uy; 255uy; 255uy; 255uy; 239uy; 65uy; 0uy; 0uy; 0uy; 0uy
0uy; 0uy; 112uy; 63uy; 0uy; 0uy; 0uy; 0uy; 0uy; 0uy
240uy; 61uy; 223uy; 136uy; 30uy; 28uy; 254uy; 116uy; 170uy; 1uy
250uy; 89uy; 140uy; 66uy; 202uy; 192uy; 243uy; 63uy; 251uy; 89uy
140uy; 66uy; 202uy; 192uy; 243uy; 63uy; 252uy; 89uy; 140uy; 66uy
202uy; 192uy; 243uy; 63uy; 82uy; 211uy; 187uy; 188uy; 232uy; 126uy
61uy; 126uy; 255uy; 255uy; 255uy; 255uy; 255uy; 255uy; 239uy; 255uy
255uy; 255uy; 255uy; 255uy; 255uy; 239uy; 127uy; 1uy; 0uy; 0uy
0uy; 0uy; 0uy; 0uy; 0uy; 248uy; 255uy; 0uy; 0uy; 0uy
0uy; 0uy; 0uy; 240uy; 255uy; 0uy; 0uy; 0uy; 0uy; 0uy
0uy; 240uy; 127uy |]
printfn "This example of the BitConverter.ToDouble(byte [], int) \nmethod generates the following output. It converts elements \nof a byte array to double values.\n"
writeMultiLineByteArray byteArray
print "index" "array elements" "double"
print "-----" "--------------" "------"
// Convert byte array elements to double values.
BAToDouble byteArray 0
BAToDouble byteArray 2
BAToDouble byteArray 10
BAToDouble byteArray 18
BAToDouble byteArray 26
BAToDouble byteArray 34
BAToDouble byteArray 42
BAToDouble byteArray 50
BAToDouble byteArray 58
BAToDouble byteArray 66
BAToDouble byteArray 74
BAToDouble byteArray 82
BAToDouble byteArray 89
BAToDouble byteArray 97
BAToDouble byteArray 99
BAToDouble byteArray 107
BAToDouble byteArray 115
// This example of the BitConverter.ToDouble(byte [], int )
// method generates the following output. It converts elements
// of a byte array to double values.
// initial byte array
// ------------------
// 00-00-00-00-00-00-00-00-F0-3F-00-00-00-00-00-E0-6F-40-00-00-
// 00-00-00-00-00-00-00-00-F0-3F-00-00-00-00-00-E0-6F-40-00-00-
// E0-FF-FF-FF-EF-41-00-00-00-00-00-00-70-3F-00-00-00-00-00-00-
// F0-3D-DF-88-1E-1C-FE-74-AA-01-FA-59-8C-42-CA-C0-F3-3F-FB-59-
// 8C-42-CA-C0-F3-3F-FC-59-8C-42-CA-C0-F3-3F-52-D3-BB-BC-E8-7E-
// 3D-7E-FF-FF-FF-FF-FF-FF-EF-FF-FF-FF-FF-FF-FF-EF-7F-01-00-00-
// 00-F0-7F
//
// index array elements double
// ----- -------------- ------
// 0 00-00-00-00-00-00-00-00 0.0000000000000000E+000
// 2 00-00-00-00-00-00-F0-3F 1.0000000000000000E+000
// 10 00-00-00-00-00-E0-6F-40 2.5500000000000000E+002
// 18 00-00-E0-FF-FF-FF-EF-41 4.2949672950000000E+009
// 26 00-00-00-00-00-00-70-3F 3.9062500000000000E-003
// 34 00-00-00-00-00-00-F0-3D 2.3283064365386963E-010
// 42 DF-88-1E-1C-FE-74-AA-01 1.2345678901234500E-300
// 50 FA-59-8C-42-CA-C0-F3-3F 1.2345678901234565E+000
// 58 FB-59-8C-42-CA-C0-F3-3F 1.2345678901234567E+000
// 66 FC-59-8C-42-CA-C0-F3-3F 1.2345678901234569E+000
// 74 52-D3-BB-BC-E8-7E-3D-7E 1.2345678901234569E+300
// 82 FF-FF-FF-FF-FF-FF-EF-FF -1.7976931348623157E+308
// 89 FF-FF-FF-FF-FF-FF-EF-7F 1.7976931348623157E+308
// 97 01-00-00-00-00-00-00-00 4.9406564584124654E-324
// 99 00-00-00-00-00-00-F8-FF NaN
// 107 00-00-00-00-00-00-F0-FF -∞
// 115 00-00-00-00-00-00-F0-7F ∞
' Example of the BitConverter.ToDouble method.
Module BytesToDoubleDemo
Const formatter As String = "{0,5}{1,27}{2,27:E16}"
' Convert eight Byte array elements to a Double and display it.
Sub BAToDouble( bytes( ) As Byte, index As Integer )
Dim value As Double = BitConverter.ToDouble( bytes, index )
Console.WriteLine( formatter, index, _
BitConverter.ToString( bytes, index, 8 ), value )
End Sub
' Display a Byte array, using multiple lines if necessary.
Sub WriteMultiLineByteArray( bytes( ) As Byte )
Const rowSize As Integer = 20
Dim iter As Integer
Console.WriteLine( "initial Byte array" )
Console.WriteLine( "------------------" )
For iter = 0 To bytes.Length - rowSize - 1 Step rowSize
Console.Write( _
BitConverter.ToString( bytes, iter, rowSize ) )
Console.WriteLine( "-" )
Next iter
Console.WriteLine( BitConverter.ToString( bytes, iter ) )
Console.WriteLine( )
End Sub
Sub Main( )
Dim byteArray as Byte( ) = { _
0, 0, 0, 0, 0, 0, 0, 0, 240, 63, _
0, 0, 0, 0, 0, 224, 111, 64, 0, 0, _
224, 255, 255, 255, 239, 65, 0, 0, 0, 0, _
0, 0, 112, 63, 0, 0, 0, 0, 0, 0, _
240, 61, 223, 136, 30, 28, 254, 116, 170, 1, _
250, 89, 140, 66, 202, 192, 243, 63, 251, 89, _
140, 66, 202, 192, 243, 63, 252, 89, 140, 66, _
202, 192, 243, 63, 82, 211, 187, 188, 232, 126, _
61, 126, 255, 255, 255, 255, 255, 255, 239, 255, _
255, 255, 255, 255, 255, 239, 127, 1, 0, 0, _
0, 0, 0, 0, 0, 248, 255, 0, 0, 0, _
0, 0, 0, 240, 255, 0, 0, 0, 0, 0, _
0, 240, 127 }
Console.WriteLine( _
"This example of the BitConverter.ToDouble( Byte( ), " & _
"Integer ) " & vbCrLf & "method generates the " & _
"following output. It converts elements " & vbCrLf & _
"of a Byte array to Double values." & vbCrLf )
WriteMultiLineByteArray( byteArray )
Console.WriteLine( formatter, "index", "array elements", _
"Double" )
Console.WriteLine( formatter, "-----", "--------------", _
"------" )
' Convert Byte array elements to Double values.
BAToDouble( byteArray, 0 )
BAToDouble( byteArray, 2 )
BAToDouble( byteArray, 10 )
BAToDouble( byteArray, 18 )
BAToDouble( byteArray, 26 )
BAToDouble( byteArray, 34 )
BAToDouble( byteArray, 42 )
BAToDouble( byteArray, 50 )
BAToDouble( byteArray, 58 )
BAToDouble( byteArray, 66 )
BAToDouble( byteArray, 74 )
BAToDouble( byteArray, 82 )
BAToDouble( byteArray, 89 )
BAToDouble( byteArray, 97 )
BAToDouble( byteArray, 99 )
BAToDouble( byteArray, 107 )
BAToDouble( byteArray, 115 )
End Sub
End Module
' This example of the BitConverter.ToDouble( Byte( ), Integer )
' method generates the following output. It converts elements
' of a Byte array to Double values.
'
' initial Byte array
' ------------------
' 00-00-00-00-00-00-00-00-F0-3F-00-00-00-00-00-E0-6F-40-00-00-
' E0-FF-FF-FF-EF-41-00-00-00-00-00-00-70-3F-00-00-00-00-00-00-
' F0-3D-DF-88-1E-1C-FE-74-AA-01-FA-59-8C-42-CA-C0-F3-3F-FB-59-
' 8C-42-CA-C0-F3-3F-FC-59-8C-42-CA-C0-F3-3F-52-D3-BB-BC-E8-7E-
' 3D-7E-FF-FF-FF-FF-FF-FF-EF-FF-FF-FF-FF-FF-FF-EF-7F-01-00-00-
' 00-00-00-00-00-F8-FF-00-00-00-00-00-00-F0-FF-00-00-00-00-00-
' 00-F0-7F
'
' index array elements Double
' ----- -------------- ------
' 0 00-00-00-00-00-00-00-00 0.0000000000000000E+000
' 2 00-00-00-00-00-00-F0-3F 1.0000000000000000E+000
' 10 00-00-00-00-00-E0-6F-40 2.5500000000000000E+002
' 18 00-00-E0-FF-FF-FF-EF-41 4.2949672950000000E+009
' 26 00-00-00-00-00-00-70-3F 3.9062500000000000E-003
' 34 00-00-00-00-00-00-F0-3D 2.3283064365386963E-010
' 42 DF-88-1E-1C-FE-74-AA-01 1.2345678901234500E-300
' 50 FA-59-8C-42-CA-C0-F3-3F 1.2345678901234565E+000
' 58 FB-59-8C-42-CA-C0-F3-3F 1.2345678901234567E+000
' 66 FC-59-8C-42-CA-C0-F3-3F 1.2345678901234569E+000
' 74 52-D3-BB-BC-E8-7E-3D-7E 1.2345678901234569E+300
' 82 FF-FF-FF-FF-FF-FF-EF-FF -1.7976931348623157E+308
' 89 FF-FF-FF-FF-FF-FF-EF-7F 1.7976931348623157E+308
' 97 01-00-00-00-00-00-00-00 4.9406564584124654E-324
' 99 00-00-00-00-00-00-F8-FF NaN
' 107 00-00-00-00-00-00-F0-FF -Infinity
' 115 00-00-00-00-00-00-F0-7F Infinity
注釈
このメソッドは ToDouble 、バイトをインデックス startIndex から + 7 に startIndex 値に Double 変換します。 配列内のバイト数は、コンピューター システムのアーキテクチャのエンディアンを反映している必要があります。 詳細については、クラス トピックの「解説」セクションを BitConverter 参照してください。