AccessViolation при использовании блокировки ⇐ C#

[Anonymous]

Я хотел бы сравнить аналогичные изображения более быстрее, используя метод блокировки следующим образом < /p>

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;

public class CompareImages {

public static void Main ( String[] args ) {

Bitmap bm1 = new Bitmap ( "PB270029.JPG" );
Console.WriteLine ( bm1.PixelFormat.ToString() );

int width = bm1.Width;
int height = bm1.Height;
Console.WriteLine ( "width = " + width + " height = " + height );

Rectangle rect1 = new Rectangle ( 0, 0, width, height );
BitmapData bm1Data = bm1.LockBits ( rect1, ImageLockMode.ReadOnly, bm1.PixelFormat );

Console.WriteLine ( "stride = " + bm1Data.Stride );

IntPtr bm1Ptr = bm1Data.Scan0;

int bytes = Math.Abs(bm1Data.Stride) * height;
Console.WriteLine ( "bytes = " + bytes );

byte[] rgbValues1 = new byte [ bytes ];
Marshal.Copy ( bm1Ptr, rgbValues1, 0, bytes );

Console.WriteLine ( "After 1st Marshal.Copy ..." );

Bitmap bm2 = new Bitmap ( "PA050164.JPG" );
Rectangle rect2 = new Rectangle ( 0, 0, bm2.Width, bm2.Height );
BitmapData bm2Data = bm2.LockBits ( rect2, ImageLockMode.ReadOnly, bm2.PixelFormat );

IntPtr bm2Ptr = bm2Data.Scan0;
byte[] rgbValues2 = new byte [ Math.Abs(bm2Data.Stride) * bm2.Height ];
Marshal.Copy ( bm2Ptr, rgbValues2, 0, rgbValues2.Length );

}

}
< /code>

Но во время второго маршала.copy возникает AccessViolationException: < /p>

C:\CompareImages>csc CompareImages.cs
Microsoft (R) Visual C# 2010 Compiler version 4.0.30319.1
Copyright (C) Microsoft Corporation. All rights reserved.

C:\CompareImages>CompareImages.exe
Format24bppRgb
width = 3648 height = 2736
stride = 10944
bytes = 29942784
After 1st Marshal.Copy ...

Unhandled Exception: System.AccessViolationException: Attempted to read or write
protected memory. This is often an indication that other memory is corrupt.
at System.Runtime.InteropServices.Marshal.CopyToManaged(IntPtr source, Object
destination, Int32 startIndex, Int32 length)
at CompareImages.Main(String[] args)
< /code>

Что не так в моей программе?>

Подробнее здесь: https://stackoverflow.com/questions/481 ... g-lockbits