Buffer.GetByte(Array, Int32) Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Retrieves the byte at the specified location in the specified array.
public:
static System::Byte GetByte(Array ^ array, int index);public static byte GetByte (Array array, int index);static member GetByte : Array * int -> bytePublic Shared Function GetByte (array As Array, index As Integer) As ByteParameters
- array
- Array
An array.
- index
- Int32
A location in the array.
Returns
The byte at the specified location in the array.
Exceptions
array is not a primitive.
array is null.
index is negative or greater than the length of array.
array is larger than 2 gigabytes (GB).
Examples
The following code example displays the byte values at specified locations within arrays using the GetByte method.
// Example of the Buffer::GetByte method.
using namespace System;
#define formatter "{0,10}{1,10}{2,9} {3}"
// Display the array contents in hexadecimal.
void DisplayArray( Array^ arr, String^ name )
{
// Get the array element width; format the formatting string.
int elemWidth = Buffer::ByteLength( arr ) / arr->Length;
String^ format = String::Format( " {{0:X{0}}}", 2 * elemWidth );
// Display the array elements from right to left.
Console::Write( "{0,5}:", name );
for ( int loopX = arr->Length - 1; loopX >= 0; loopX-- )
Console::Write( format, arr->GetValue( loopX ) );
Console::WriteLine();
}
void ArrayInfo( Array^ arr, String^ name, int index )
{
unsigned char value = Buffer::GetByte( arr, index );
// Display the array name, index, and byte to be viewed.
Console::WriteLine( formatter, name, index, value, String::Format( "0x{0:X2}", value ) );
}
int main()
{
// These are the arrays to be viewed with GetByte.
array<__int64>^longs = {333333333333333333,666666666666666666,999999999999999999};
array<int>^ints = {111111111,222222222,333333333,444444444,555555555};
Console::WriteLine( "This example of the "
"Buffer::GetByte( Array*, int ) \n"
"method generates the following output.\n"
"Note: The arrays are displayed from right to left.\n" );
Console::WriteLine( " Values of arrays:\n" );
// Display the values of the arrays.
DisplayArray( longs, "longs" );
DisplayArray( ints, "ints" );
Console::WriteLine();
Console::WriteLine( formatter, "Array", "index", "value", "" );
Console::WriteLine( formatter, "-----", "-----", "-----", "----" );
// Display the Length and ByteLength for each array.
ArrayInfo( ints, "ints", 0 );
ArrayInfo( ints, "ints", 7 );
ArrayInfo( ints, "ints", 10 );
ArrayInfo( ints, "ints", 17 );
ArrayInfo( longs, "longs", 0 );
ArrayInfo( longs, "longs", 6 );
ArrayInfo( longs, "longs", 10 );
ArrayInfo( longs, "longs", 17 );
ArrayInfo( longs, "longs", 21 );
}
/*
This example of the Buffer::GetByte( Array*, int )
method generates the following output.
Note: The arrays are displayed from right to left.
Values of arrays:
longs: 0DE0B6B3A763FFFF 094079CD1A42AAAA 04A03CE68D215555
ints: 211D1AE3 1A7DAF1C 13DE4355 0D3ED78E 069F6BC7
Array index value
----- ----- ----- ----
ints 0 199 0xC7
ints 7 13 0x0D
ints 10 222 0xDE
ints 17 26 0x1A
longs 0 85 0x55
longs 6 160 0xA0
longs 10 66 0x42
longs 17 255 0xFF
longs 21 182 0xB6
*/
// Example of the Buffer.GetByte method.
using System;
class GetByteDemo
{
const string formatter = "{0,10}{1,10}{2,9} {3}";
// Display the array contents in hexadecimal.
public static void DisplayArray( Array arr, string name )
{
// Get the array element width; format the formatting string.
int elemWidth = Buffer.ByteLength( arr ) / arr.Length;
string format = String.Format( " {{0:X{0}}}", 2 * elemWidth );
// Display the array elements from right to left.
Console.Write( "{0,5}:", name );
for( int loopX = arr.Length - 1; loopX >= 0; loopX-- )
Console.Write( format, arr.GetValue( loopX ) );
Console.WriteLine( );
}
public static void ArrayInfo( Array arr, string name, int index )
{
byte value = Buffer.GetByte( arr, index );
// Display the array name, index, and byte to be viewed.
Console.WriteLine( formatter, name, index, value,
String.Format( "0x{0:X2}", value ) );
}
public static void Main( )
{
// These are the arrays to be viewed with GetByte.
long[ ] longs =
{ 333333333333333333, 666666666666666666, 999999999999999999 };
int[ ] ints =
{ 111111111, 222222222, 333333333, 444444444, 555555555 };
Console.WriteLine( "This example of the " +
"Buffer.GetByte( Array, int ) \n" +
"method generates the following output.\n" +
"Note: The arrays are displayed from right to left.\n" );
Console.WriteLine( " Values of arrays:\n" );
// Display the values of the arrays.
DisplayArray( longs, "longs" );
DisplayArray( ints, "ints" );
Console.WriteLine( );
Console.WriteLine( formatter, "Array", "index", "value", "" );
Console.WriteLine( formatter, "-----", "-----", "-----",
"----" );
// Display the Length and ByteLength for each array.
ArrayInfo( ints, "ints", 0 );
ArrayInfo( ints, "ints", 7 );
ArrayInfo( ints, "ints", 10 );
ArrayInfo( ints, "ints", 17 );
ArrayInfo( longs, "longs", 0 );
ArrayInfo( longs, "longs", 6 );
ArrayInfo( longs, "longs", 10 );
ArrayInfo( longs, "longs", 17 );
ArrayInfo( longs, "longs", 21 );
}
}
/*
This example of the Buffer.GetByte( Array, int )
method generates the following output.
Note: The arrays are displayed from right to left.
Values of arrays:
longs: 0DE0B6B3A763FFFF 094079CD1A42AAAA 04A03CE68D215555
ints: 211D1AE3 1A7DAF1C 13DE4355 0D3ED78E 069F6BC7
Array index value
----- ----- ----- ----
ints 0 199 0xC7
ints 7 13 0x0D
ints 10 222 0xDE
ints 17 26 0x1A
longs 0 85 0x55
longs 6 160 0xA0
longs 10 66 0x42
longs 17 255 0xFF
longs 21 182 0xB6
*/
open System
let print obj1 obj2 obj3 obj4 = printfn $"{obj1,10}{obj2,10}{obj3,9} {obj4}"
// Display the array contents in hexadecimal.
let inline displayArray (arr: ^a []) name =
// Get the array element width; format the formatting string.
let elemWidth = Buffer.ByteLength arr / arr.Length
// Display the array elements from right to left.
printf $"{name,5}:"
for i = arr.Length - 1 downto 0 do
printf " %0*X" (2 * elemWidth) arr[i]
printfn ""
let arrayInfo (arr: Array) name index =
let value = Buffer.GetByte(arr, index)
// Display the array name, index, and byte to be viewed.
print name index value $"0x{value:X2}"
// These are the arrays to be viewed with GetByte.
let longs =
[| 333333333333333333L; 666666666666666666L; 999999999999999999L |]
let ints =
[| 111111111; 222222222; 333333333; 444444444; 555555555 |]
printfn "This example of the Buffer.GetByte(Array, int) \nmethod generates the following output.\nNote: The arrays are displayed from right to left.\n"
printfn " Values of arrays:\n"
// Display the values of the arrays.
displayArray longs "longs"
displayArray ints "ints"
printfn ""
print "Array" "index" "value" ""
print "-----" "-----" "-----" "----"
// Display the Length and ByteLength for each array.
arrayInfo ints "ints" 0
arrayInfo ints "ints" 7
arrayInfo ints "ints" 10
arrayInfo ints "ints" 17
arrayInfo longs "longs" 0
arrayInfo longs "longs" 6
arrayInfo longs "longs" 10
arrayInfo longs "longs" 17
arrayInfo longs "longs" 21
// This example of the Buffer.GetByte( Array, int )
// method generates the following output.
// Note: The arrays are displayed from right to left.
//
// Values of arrays:
//
// longs: 0DE0B6B3A763FFFF 094079CD1A42AAAA 04A03CE68D215555
// ints: 211D1AE3 1A7DAF1C 13DE4355 0D3ED78E 069F6BC7
//
// Array index value
// ----- ----- ----- ----
// ints 0 199 0xC7
// ints 7 13 0x0D
// ints 10 222 0xDE
// ints 17 26 0x1A
// longs 0 85 0x55
// longs 6 160 0xA0
// longs 10 66 0x42
// longs 17 255 0xFF
// longs 21 182 0xB6
' Example of the Buffer.GetByte method.
Module GetByteDemo
Const formatter As String = "{0,10}{1,10}{2,9} {3}"
' Display the array contents in hexadecimal.
Sub DisplayArray( arr As Array, name As String )
' Get the array element width; format the formatting string.
Dim loopX As Integer
Dim elemWidth As Integer = _
Buffer.ByteLength( arr ) / arr.Length
Dim format As String = _
String.Format( " {{0:X{0}}}", 2 * elemWidth )
' Display the array elements from right to left.
Console.Write( "{0,7}:", name )
For loopX = arr.Length - 1 to 0 Step -1
Console.Write( format, arr( loopX ) )
Next loopX
Console.WriteLine( )
End Sub
Sub ArrayInfo( arr As Array, name As String, index As Integer )
Dim value As Byte = Buffer.GetByte( arr, index )
' Display the array name, index, and byte to be viewed.
Console.WriteLine( formatter, name, index, value, _
String.Format( "&H{0:X2}", value ) )
End Sub
Sub Main( )
' These are the arrays to be viewed with GetByte.
Dim longs( ) As Long = _
{ 333333333333333333, 666666666666666666, 999999999999999999 }
Dim ints( ) As Integer = _
{ 111111111, 222222222, 333333333, 444444444, 555555555 }
Console.WriteLine( "This example of the " & _
"Buffer.GetByte( Array, Integer ) " & vbCrLf & _
"method generates the following output." & vbCrLf & _
"Note: The arrays are displayed from right to left." )
Console.WriteLine( vbCrLf & " Values of arrays:" & vbCrLf )
' Display the values of the arrays.
DisplayArray( longs, "longs" )
DisplayArray( ints, "ints" )
Console.WriteLine( )
Console.WriteLine( formatter, "Array", "index", _
"value", "" )
Console.WriteLine( formatter, "-----", "-----", _
"-----", "----" )
' Display the Length and ByteLength for each array.
ArrayInfo( ints, "ints", 0 )
ArrayInfo( ints, "ints", 7 )
ArrayInfo( ints, "ints", 10 )
ArrayInfo( ints, "ints", 17 )
ArrayInfo( longs, "longs", 0 )
ArrayInfo( longs, "longs", 6 )
ArrayInfo( longs, "longs", 10 )
ArrayInfo( longs, "longs", 17 )
ArrayInfo( longs, "longs", 21 )
End Sub
End Module
' This example of the Buffer.GetByte( Array, Integer )
' method generates the following output.
' Note: The arrays are displayed from right to left.
'
' Values of arrays:
'
' longs: 0DE0B6B3A763FFFF 094079CD1A42AAAA 04A03CE68D215555
' ints: 211D1AE3 1A7DAF1C 13DE4355 0D3ED78E 069F6BC7
'
' Array index value
' ----- ----- ----- ----
' ints 0 199 &HC7
' ints 7 13 &H0D
' ints 10 222 &HDE
' ints 17 26 &H1A
' longs 0 85 &H55
' longs 6 160 &HA0
' longs 10 66 &H42
' longs 17 255 &HFF
' longs 21 182 &HB6
Remarks
The GetByte method gets a particular byte out of the array. The array must be an array of primitives.
Applies to
Spolupracujte s námi na GitHubu
Zdroj tohoto obsahu najdete na GitHubu, kde můžete také vytvářet a kontrolovat problémy a žádosti o přijetí změn. Další informace najdete v našem průvodci pro přispěvatele.
