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Marshal.Copy Method (Int32(), Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed 32-bit signed integer array to an unmanaged memory pointer.

Namespace:  System.Runtime.InteropServices
Assemblies:   System.Runtime.InteropServices (in System.Runtime.InteropServices.dll)
  mscorlib (in mscorlib.dll)

'Declaration
Public Shared Sub Copy ( _
	source As Integer(), _
	startIndex As Integer, _
	destination As IntPtr, _
	length As Integer _
)

Parameters

source
Type: System.Int32()

The one-dimensional array to copy from.

startIndex
Type: System.Int32

The zero-based index in the source array where copying should start.

destination
Type: System.IntPtr

The memory pointer to copy to.

length
Type: System.Int32

The number of array elements to copy.

ExceptionCondition
ArgumentOutOfRangeException

startIndex and length are not valid.

ArgumentNullException

startIndex or length is Nothing.

You can use this method to copy a subset of a one-dimensional managed array to an unmanaged C-style array.

The following example copies an array to unmanaged memory and then copies the unmanaged array back to managed memory.

Imports System
Imports System.Runtime.InteropServices



Module Example


    Sub Main()
        ' Create a managed array. 
        Dim managedArray As Integer() = {1, 2, 3, 4}

        ' Initialize unmanaged memory to hold the array. 
        Dim size As Integer = Marshal.SizeOf(managedArray(0)) * managedArray.Length

        Dim pnt As IntPtr = Marshal.AllocHGlobal(size)

        Try 
            ' Copy the array to unmanaged memory.
            Marshal.Copy(managedArray, 0, pnt, managedArray.Length)

            ' Copy the unmanaged array back to another managed array. 
            Dim managedArray2(managedArray.Length) As Integer

            Marshal.Copy(pnt, managedArray2, 0, managedArray.Length)

            Console.WriteLine("The array was copied to unmanaged memory and back.")

        Finally 
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)
        End Try 

    End Sub 
End Module

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

  • SecurityCriticalAttribute 

    requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

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