Copy Method (IntPtr, Double[], Int32, Int32)

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

 

Copies data from an unmanaged memory pointer to a managed double-precision floating-point number array.

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

[SecurityCriticalAttribute]
public static void Copy(
	IntPtr source,
	double[] destination,
	int startIndex,
	int length
)

Parameters

source
Type: System.IntPtr

The memory pointer to copy from.

destination
Type: System.Double[]

The array to copy to.

startIndex
Type: System.Int32

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

length
Type: System.Int32

The number of array elements to copy.

Exception Condition
ArgumentNullException

source, destination, startIndex, or length is null.

Unmanaged, C-style arrays do not contain bounds information, which prevents the startIndex and length parameters from being validated. Thus, the unmanaged data corresponding to the source parameter populates the managed array regardless of its usefulness. You must initialize the managed array with the appropriate size before calling this method.

The following 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.
        double[] managedArray = { 0.1, 0.2, 0.3, 0.4 };

        // Initialize unmanaged 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.

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

            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);
        }



    }

}

SecurityCriticalAttribute

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

Universal Windows Platform
Available since 4.5
.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
Return to top
Show:
© 2016 Microsoft