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Marshal.Copy Method (Int64[], Int32, IntPtr, Int32)

Copies data from a one-dimensional, managed 64-bit signed integer array to an unmanaged memory pointer.

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

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

Marshal.Copy(source, startIndex, destination, length)
public static void Copy (
	long[] source, 
	int startIndex, 
	IntPtr destination, 
	int length
)
public static function Copy (
	source : long[], 
	startIndex : int, 
	destination : IntPtr, 
	length : int
)
Not applicable.

Parameters

source

The one-dimensional array to copy from.

startIndex

The zero-based index into the array where Copy should start.

destination

The memory pointer to copy to.

length

The number of array elements to copy.

Exception typeCondition

ArgumentOutOfRangeException

startIndex and length are not valid.

ArgumentNullException

source, startIndex, destination, or length is a null reference (Nothing in Visual Basic).

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

NoteNote:

This method uses SecurityAction.LinkDemand to prevent it from being called from untrusted code; only the immediate caller is required to have SecurityPermissionAttribute.UnmanagedCode permission. If your code can be called from partially trusted code, do not pass user input to Marshal class methods without validation. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand.

The following code 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 Int64() = {1, 2, 3, 4}

        ' Initialize unmanged 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 Int64

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

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

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

    End Sub
End Module



Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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