BitConverter.ToDouble メソッド
アセンブリ: mscorlib (mscorlib.dll 内)

Dim value As Byte() Dim startIndex As Integer Dim returnValue As Double returnValue = BitConverter.ToDouble(value, startIndex)
戻り値
startIndex から始まる 8 バイトで構成される倍精度浮動小数点数。


ToDouble メソッドを使用して、Byte 配列の要素を Double 値に変換するコード例を次に示します。
' Example of the BitConverter.ToDouble method. Imports System Imports Microsoft.VisualBasic 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
// 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 */
// 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. import System.*; class BytesToDoubleDemo { private static String formatter = "{0 ,5}{1,27}{2,27:E16}"; // Convert eight byte array elements to a double and display it. public static void BAToDouble(ubyte bytes[], int index) { double value = BitConverter.ToDouble(bytes, index); Console.WriteLine(formatter, (Int32)index, BitConverter.ToString(bytes, index, 8), (System.Double)value); } //BAToDouble // Display a byte array, using multiple lines if necessary. public static void WriteMultiLineByteArray(ubyte bytes[]) { final 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(); } //WriteMultiLineByteArray public static void main(String[] args) { ubyte 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 ) \n" + "method 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); } //main } //BytesToDoubleDemo /* 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 */

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