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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
Assembly: mscorlib (in mscorlib.dll)

public static void Copy (
	int[] source,
	int startIndex,
	IntPtr destination,
	int length
)
public static void Copy (
	int[] source, 
	int startIndex, 
	IntPtr destination, 
	int length
)
public static function Copy (
	source : int[], 
	startIndex : int, 
	destination : IntPtr, 
	length : int
)

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

startIndex 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.

using System;
using System.Runtime.InteropServices;

class Example
{

    static void Main()
    {
        // Create a managed array.
        int[] managedArray = { 1, 2, 3, 4 };

        // Initialize unmanged memory to hold the array.
        int size = Marshal.SizeOf(managedArray[0]) * managedArray.Length;

        IntPtr pnt = 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.

            int[] managedArray2 = new int[managedArray.Length];

            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);
        }
        


    }

}

Windows 98, Windows 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0
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