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BitConverter::ToUInt32 Method

Returns a 32-bit unsigned integer converted from four bytes at a specified position in a byte array.

This API is not CLS-compliant. 

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

[CLSCompliantAttribute(false)]
public:
static unsigned int ToUInt32(
	array<unsigned char>^ value, 
	int startIndex
)

Parameters

value
Type: array<System::Byte>
An array of bytes.
startIndex
Type: System::Int32
The starting position within value.

Return Value

Type: System::UInt32
A 32-bit unsigned integer formed by four bytes beginning at startIndex.

ExceptionCondition
ArgumentException

startIndex is greater than or equal to the length of value minus 3, and is less than or equal to the length of value minus 1.

ArgumentNullException

value is nullptr.

ArgumentOutOfRangeException

startIndex is less than zero or greater than the length of value minus 1.

The following code example converts elements of Byte arrays to UInt32 values with the ToUInt32 method.


// Example of the BitConverter::ToUInt32 method.
using namespace System;

// Convert four byte array elements to an unsigned int and display it.
void BAToUInt32( array<unsigned char>^bytes, int index )
{
   unsigned int value = BitConverter::ToUInt32( bytes, index );
   Console::WriteLine( "{0,5}{1,17}{2,15}", index, BitConverter::ToString( bytes, index, 4 ), value );
}

int main()
{
   array<unsigned char>^byteArray = {15,0,0,0,0,16,0,255,3,0,0,202,154,59,255,255,255,255,127};
   Console::WriteLine( "This example of the BitConverter::ToUInt32( unsigned "
   "char[ ], int ) \nmethod generates the following output. It "
   "converts elements of a \nbyte array to unsigned int "
   "values.\n" );
   Console::WriteLine( "initial byte array" );
   Console::WriteLine( "------------------" );
   Console::WriteLine( BitConverter::ToString( byteArray ) );
   Console::WriteLine();
   Console::WriteLine( "{0,5}{1,17}{2,15}", "index", "array elements", "unsigned int" );
   Console::WriteLine( "{0,5}{1,17}{2,15}", "-----", "--------------", "------------" );

   // Convert byte array elements to unsigned int values.
   BAToUInt32( byteArray, 1 );
   BAToUInt32( byteArray, 0 );
   BAToUInt32( byteArray, 7 );
   BAToUInt32( byteArray, 3 );
   BAToUInt32( byteArray, 10 );
   BAToUInt32( byteArray, 15 );
   BAToUInt32( byteArray, 14 );
}

/*
This example of the BitConverter::ToUInt32( unsigned char[ ], int )
method generates the following output. It converts elements of a
byte array to unsigned int values.

initial byte array
------------------
0F-00-00-00-00-10-00-FF-03-00-00-CA-9A-3B-FF-FF-FF-FF-7F

index   array elements   unsigned int
-----   --------------   ------------
    1      00-00-00-00              0
    0      0F-00-00-00             15
    7      FF-03-00-00           1023
    3      00-00-10-00        1048576
   10      00-CA-9A-3B     1000000000
   15      FF-FF-FF-7F     2147483647
   14      FF-FF-FF-FF     4294967295
*/


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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