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Buffer::SetByte Method (Array^, Int32, Byte)

 

Assigns a specified value to a byte at a particular location in a specified array.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

public:
static void SetByte(
	Array^ array,
	int index,
	unsigned char value
)

Parameters

array
Type: System::Array^

An array.

index
Type: System::Int32

A location in the array.

value
Type: System::Byte

A value to assign.

Exception Condition
ArgumentException

array is not a primitive.

ArgumentNullException

array is null.

ArgumentOutOfRangeException

index is negative or greater than the length of array.

OverflowException

array is larger than 2 gigabytes (GB).

array must be an array of primitives.

The following code example assigns values to bytes at particular locations within arrays using the SetByte method.

// Example of the Buffer::SetByte method.
using namespace System;

// 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( "{0,7}:", name );
   for ( int loopX = arr->Length - 1; loopX >= 0; loopX-- )
      Console::Write( format, arr->GetValue( loopX ) );
   Console::WriteLine();
}

int main()
{

   // These are the arrays to be modified with SetByte.
   array<Int16>^shorts = gcnew array<Int16>(10);
   array<Int64>^longs = gcnew array<Int64>(3);
   Console::WriteLine( "This example of the "
   "Buffer::SetByte( Array*, int, unsigned char ) \n"
   "method generates the following output.\n"
   "Note: The arrays are displayed from right to left.\n" );
   Console::WriteLine( "  Initial values of arrays:\n" );

   // Display the initial values of the arrays.
   DisplayArray( shorts, "shorts" );
   DisplayArray( longs, "longs" );

   // Copy two regions of source array to destination array,
   // and two overlapped copies from source to source.
   Console::WriteLine( "\n  Array values after setting byte 3 = 25, \n"
   "  byte 6 = 64, byte 12 = 121, and byte 17 = 196:\n" );
   Buffer::SetByte( shorts, 3, 25 );
   Buffer::SetByte( shorts, 6, 64 );
   Buffer::SetByte( shorts, 12, 121 );
   Buffer::SetByte( shorts, 17, 196 );
   Buffer::SetByte( longs, 3, 25 );
   Buffer::SetByte( longs, 6, 64 );
   Buffer::SetByte( longs, 12, 121 );
   Buffer::SetByte( longs, 17, 196 );

   // Display the arrays again.
   DisplayArray( shorts, "shorts" );
   DisplayArray( longs, "longs" );
}

/*
This example of the Buffer::SetByte( Array*, int, unsigned char )
method generates the following output.
Note: The arrays are displayed from right to left.

  Initial values of arrays:

 shorts: 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
  longs: 0000000000000000 0000000000000000 0000000000000000

  Array values after setting byte 3 = 25,
  byte 6 = 64, byte 12 = 121, and byte 17 = 196:

 shorts: 0000 C400 0000 0079 0000 0000 0040 0000 1900 0000
  longs: 000000000000C400 0000007900000000 0040000019000000
*/

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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