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Gibt eine Gleitkommazahl mit einfacher Genauigkeit zurück, die aus vier Bytes an der angegebenen Position in einem Bytearray konvertiert wurde.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function ToSingle ( _
value As Byte(), _
startIndex As Integer _
) As Single
'Usage
Dim value As Byte()
Dim startIndex As Integer
Dim returnValue As Single
returnValue = BitConverter.ToSingle(value, startIndex)
public static float ToSingle (
byte[] value,
int startIndex
)
public:
static float ToSingle (
array<unsigned char>^ value,
int startIndex
)
public static float ToSingle (
byte[] value,
int startIndex
)
public static function ToSingle (
value : byte[],
startIndex : int
) : float
Parameter
- value
Ein Bytearray.
- startIndex
Die Anfangsposition in value.
Rückgabewert
Eine Gleitkommazahl mit einfacher Genauigkeit, die beginnend bei startIndex aus vier Bytes gebildet wird.
Ausnahmen
| Ausnahmetyp | Bedingung |
|---|---|
value ist NULL (Nothing in Visual Basic). |
|
startIndex ist kleiner als 0 (null) oder größer als die Länge von value minus 4. |
Beispiel
Im folgenden Codebeispiel werden Elemente von Byte-Arrays mithilfe der ToSingle-Methode in Single-Werte konvertiert.
' Example of the BitConverter.ToSingle method.
Imports System
Imports Microsoft.VisualBasic
Module BytesToSingleDemo
Const formatter As String = "{0,5}{1,17}{2,18:E7}"
' Convert four Byte array elements to a Single and display it.
Sub BAToSingle( bytes( ) As Byte, index As Integer )
Dim value As Single = BitConverter.ToSingle( bytes, index )
Console.WriteLine( formatter, index, _
BitConverter.ToString( bytes, index, 4 ), 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, 128, 63, 0, 0, 112, 65, _
0, 255, 127, 71, 0, 0, 128, 59, 0, 0, _
128, 47, 73, 70, 131, 5, 75, 6, 158, 63, _
77, 6, 158, 63, 80, 6, 158, 63, 30, 55, _
190, 121, 255, 255, 127, 255, 255, 127, 127, 1, _
0, 0, 0, 192, 255, 0, 0, 128, 255, 0, _
0, 128, 127 }
Console.WriteLine( _
"This example of the BitConverter.ToSingle( Byte( ), " & _
"Integer ) " & vbCrLf & "method generates the " & _
"following output. It converts elements " & vbCrLf & _
"of a Byte array to Single values." & vbCrLf )
WriteMultiLineByteArray( byteArray )
Console.WriteLine( formatter, "index", "array elements", _
"Single" )
Console.WriteLine( formatter, "-----", "--------------", _
"------" )
' Convert Byte array elements to Single values.
BAToSingle( byteArray, 0 )
BAToSingle( byteArray, 2 )
BAToSingle( byteArray, 6 )
BAToSingle( byteArray, 10 )
BAToSingle( byteArray, 14 )
BAToSingle( byteArray, 18 )
BAToSingle( byteArray, 22 )
BAToSingle( byteArray, 26 )
BAToSingle( byteArray, 30 )
BAToSingle( byteArray, 34 )
BAToSingle( byteArray, 38 )
BAToSingle( byteArray, 42 )
BAToSingle( byteArray, 45 )
BAToSingle( byteArray, 49 )
BAToSingle( byteArray, 51 )
BAToSingle( byteArray, 55 )
BAToSingle( byteArray, 59 )
End Sub
End Module
' This example of the BitConverter.ToSingle( Byte( ), Integer )
' method generates the following output. It converts elements
' of a Byte array to Single values.
'
' initial Byte array
' ------------------
' 00-00-00-00-80-3F-00-00-70-41-00-FF-7F-47-00-00-80-3B-00-00-
' 80-2F-49-46-83-05-4B-06-9E-3F-4D-06-9E-3F-50-06-9E-3F-1E-37-
' BE-79-FF-FF-7F-FF-FF-7F-7F-01-00-00-00-C0-FF-00-00-80-FF-00-
' 00-80-7F
'
' index array elements Single
' ----- -------------- ------
' 0 00-00-00-00 0.0000000E+000
' 2 00-00-80-3F 1.0000000E+000
' 6 00-00-70-41 1.5000000E+001
' 10 00-FF-7F-47 6.5535000E+004
' 14 00-00-80-3B 3.9062500E-003
' 18 00-00-80-2F 2.3283064E-010
' 22 49-46-83-05 1.2345000E-035
' 26 4B-06-9E-3F 1.2345671E+000
' 30 4D-06-9E-3F 1.2345673E+000
' 34 50-06-9E-3F 1.2345676E+000
' 38 1E-37-BE-79 1.2345679E+035
' 42 FF-FF-7F-FF -3.4028235E+038
' 45 FF-FF-7F-7F 3.4028235E+038
' 49 01-00-00-00 1.4012985E-045
' 51 00-00-C0-FF NaN
' 55 00-00-80-FF -Infinity
' 59 00-00-80-7F Infinity
// Example of the BitConverter.ToSingle method.
using System;
class BytesToSingleDemo
{
const string formatter = "{0,5}{1,17}{2,18:E7}";
// Convert four byte array elements to a float and display it.
public static void BAToSingle( byte[ ] bytes, int index )
{
float value = BitConverter.ToSingle( bytes, index );
Console.WriteLine( formatter, index,
BitConverter.ToString( bytes, index, 4 ), 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, 128, 63, 0, 0, 112, 65,
0, 255, 127, 71, 0, 0, 128, 59, 0, 0,
128, 47, 73, 70, 131, 5, 75, 6, 158, 63,
77, 6, 158, 63, 80, 6, 158, 63, 30, 55,
190, 121, 255, 255, 127, 255, 255, 127, 127, 1,
0, 0, 0, 192, 255, 0, 0, 128, 255, 0,
0, 128, 127 };
Console.WriteLine(
"This example of the BitConverter.ToSingle( byte( ), " +
"int ) \nmethod generates the following output. It " +
"converts elements \nof a byte array to float values.\n" );
WriteMultiLineByteArray( byteArray );
Console.WriteLine( formatter, "index", "array elements",
"float" );
Console.WriteLine( formatter, "-----", "--------------",
"-----" );
// Convert byte array elements to float values.
BAToSingle( byteArray, 0 );
BAToSingle( byteArray, 2 );
BAToSingle( byteArray, 6 );
BAToSingle( byteArray, 10 );
BAToSingle( byteArray, 14 );
BAToSingle( byteArray, 18 );
BAToSingle( byteArray, 22 );
BAToSingle( byteArray, 26 );
BAToSingle( byteArray, 30 );
BAToSingle( byteArray, 34 );
BAToSingle( byteArray, 38 );
BAToSingle( byteArray, 42 );
BAToSingle( byteArray, 45 );
BAToSingle( byteArray, 49 );
BAToSingle( byteArray, 51 );
BAToSingle( byteArray, 55 );
BAToSingle( byteArray, 59 );
}
}
/*
This example of the BitConverter.ToSingle( byte( ), int )
method generates the following output. It converts elements
of a byte array to float values.
initial byte array
------------------
00-00-00-00-80-3F-00-00-70-41-00-FF-7F-47-00-00-80-3B-00-00-
80-2F-49-46-83-05-4B-06-9E-3F-4D-06-9E-3F-50-06-9E-3F-1E-37-
BE-79-FF-FF-7F-FF-FF-7F-7F-01-00-00-00-C0-FF-00-00-80-FF-00-
00-80-7F
index array elements float
----- -------------- -----
0 00-00-00-00 0.0000000E+000
2 00-00-80-3F 1.0000000E+000
6 00-00-70-41 1.5000000E+001
10 00-FF-7F-47 6.5535000E+004
14 00-00-80-3B 3.9062500E-003
18 00-00-80-2F 2.3283064E-010
22 49-46-83-05 1.2345000E-035
26 4B-06-9E-3F 1.2345671E+000
30 4D-06-9E-3F 1.2345673E+000
34 50-06-9E-3F 1.2345676E+000
38 1E-37-BE-79 1.2345679E+035
42 FF-FF-7F-FF -3.4028235E+038
45 FF-FF-7F-7F 3.4028235E+038
49 01-00-00-00 1.4012985E-045
51 00-00-C0-FF NaN
55 00-00-80-FF -Infinity
59 00-00-80-7F Infinity
*/
// Example of the BitConverter::ToSingle method.
using namespace System;
// Convert four byte array elements to a float and display it.
void BAToSingle( array<unsigned char>^bytes, int index )
{
float value = BitConverter::ToSingle( bytes, index );
Console::WriteLine( "{0,5}{1,17}{2,18:E7}", index, BitConverter::ToString( bytes, index, 4 ), 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 = {0,0,0,0,128,63,0,0,112,65,0,255,127,71,0,0,128,59,0,0,128,47,73,70,131,5,75,6,158,63,77,6,158,63,80,6,158,63,30,55,190,121,255,255,127,255,255,127,127,1,0,0,0,192,255,0,0,128,255,0,0,128,127};
Console::WriteLine( "This example of the BitConverter::ToSingle( unsigned "
"char[ ], int ) \nmethod generates the following output. It "
"converts elements of a \nbyte array to float values.\n" );
WriteMultiLineByteArray( byteArray );
Console::WriteLine( "{0,5}{1,17}{2,18:E7}", "index", "array elements", "float" );
Console::WriteLine( "{0,5}{1,17}{2,18:E7}", "-----", "--------------", "-----" );
// Convert byte array elements to float values.
BAToSingle( byteArray, 0 );
BAToSingle( byteArray, 2 );
BAToSingle( byteArray, 6 );
BAToSingle( byteArray, 10 );
BAToSingle( byteArray, 14 );
BAToSingle( byteArray, 18 );
BAToSingle( byteArray, 22 );
BAToSingle( byteArray, 26 );
BAToSingle( byteArray, 30 );
BAToSingle( byteArray, 34 );
BAToSingle( byteArray, 38 );
BAToSingle( byteArray, 42 );
BAToSingle( byteArray, 45 );
BAToSingle( byteArray, 49 );
BAToSingle( byteArray, 51 );
BAToSingle( byteArray, 55 );
BAToSingle( byteArray, 59 );
}
/*
This example of the BitConverter::ToSingle( unsigned char[ ], int )
method generates the following output. It converts elements of a
byte array to float values.
initial unsigned char array
---------------------------
00-00-00-00-80-3F-00-00-70-41-00-FF-7F-47-00-00-80-3B-00-00-
80-2F-49-46-83-05-4B-06-9E-3F-4D-06-9E-3F-50-06-9E-3F-1E-37-
BE-79-FF-FF-7F-FF-FF-7F-7F-01-00-00-00-C0-FF-00-00-80-FF-00-
00-80-7F
index array elements float
----- -------------- -----
0 00-00-00-00 0.0000000E+000
2 00-00-80-3F 1.0000000E+000
6 00-00-70-41 1.5000000E+001
10 00-FF-7F-47 6.5535000E+004
14 00-00-80-3B 3.9062500E-003
18 00-00-80-2F 2.3283064E-010
22 49-46-83-05 1.2345000E-035
26 4B-06-9E-3F 1.2345671E+000
30 4D-06-9E-3F 1.2345673E+000
34 50-06-9E-3F 1.2345676E+000
38 1E-37-BE-79 1.2345679E+035
42 FF-FF-7F-FF -3.4028235E+038
45 FF-FF-7F-7F 3.4028235E+038
49 01-00-00-00 1.4012985E-045
51 00-00-C0-FF NaN
55 00-00-80-FF -Infinity
59 00-00-80-7F Infinity
*/
// Example of the BitConverter.ToSingle method.
import System.*;
class BytesToSingleDemo
{
private static String formatter = "{0,5}{1,17}{2,18:E7}";
// Convert four byte array elements to a float and display it.
public static void BAToSingle(ubyte bytes[], int index)
{
float value = BitConverter.ToSingle(bytes, index);
Console.WriteLine(formatter, (Int32)index,
BitConverter.ToString(bytes, index, 4), (Single)value);
} //BAToSingle
// 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, 128, 63, 0, 0, 112, 65, 0, 255, 127,
71, 0, 0, 128, 59, 0, 0, 128, 47, 73, 70, 131,
5, 75, 6, 158, 63, 77, 6, 158, 63, 80, 6, 158,
63, 30, 55, 190, 121, 255, 255, 127, 255, 255,
127, 127, 1, 0, 0, 0, 192, 255, 0, 0, 128, 255,
0, 0, 128, 127 };
Console.WriteLine("This example of the "
+ "BitConverter.ToSingle( byte( ), int ) \n"
+ "method generates the following output. "
+ "It converts elements \nof a byte array to float values.\n");
WriteMultiLineByteArray(byteArray);
Console.WriteLine(formatter, "index", "array elements", "float");
Console.WriteLine(formatter, "-----", "--------------", "-----");
// Convert byte array elements to float values.
BAToSingle(byteArray, 0);
BAToSingle(byteArray, 2);
BAToSingle(byteArray, 6);
BAToSingle(byteArray, 10);
BAToSingle(byteArray, 14);
BAToSingle(byteArray, 18);
BAToSingle(byteArray, 22);
BAToSingle(byteArray, 26);
BAToSingle(byteArray, 30);
BAToSingle(byteArray, 34);
BAToSingle(byteArray, 38);
BAToSingle(byteArray, 42);
BAToSingle(byteArray, 45);
BAToSingle(byteArray, 49);
BAToSingle(byteArray, 51);
BAToSingle(byteArray, 55);
BAToSingle(byteArray, 59);
} //main
} //BytesToSingleDemo
/*
This example of the BitConverter.ToSingle( byte( ), int )
method generates the following output. It converts elements
of a byte array to float values.
initial byte array
------------------
00-00-00-00-80-3F-00-00-70-41-00-FF-7F-47-00-00-80-3B-00-00-
80-2F-49-46-83-05-4B-06-9E-3F-4D-06-9E-3F-50-06-9E-3F-1E-37-
BE-79-FF-FF-7F-FF-FF-7F-7F-01-00-00-00-C0-FF-00-00-80-FF-00-
00-80-7F
index array elements float
----- -------------- -----
0 00-00-00-00 0.0000000E+000
2 00-00-80-3F 1.0000000E+000
6 00-00-70-41 1.5000000E+001
10 00-FF-7F-47 6.5535000E+004
14 00-00-80-3B 3.9062500E-003
18 00-00-80-2F 2.3283064E-010
22 49-46-83-05 1.2345000E-035
26 4B-06-9E-3F 1.2345671E+000
30 4D-06-9E-3F 1.2345673E+000
34 50-06-9E-3F 1.2345676E+000
38 1E-37-BE-79 1.2345679E+035
42 FF-FF-7F-FF -3.4028235E+038
45 FF-FF-7F-7F 3.4028235E+038
49 01-00-00-00 1.4012985E-045
51 00-00-C0-FF NaN
55 00-00-80-FF -Infinity
59 00-00-80-7F Infinity
*/
Plattformen
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
.NET Compact Framework
Unterstützt in: 2.0, 1.0
Siehe auch
Referenz
BitConverter-Klasse
BitConverter-Member
System-Namespace
Single