Access violation Exception with Unmanaged/unsafe code

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Hi,

I have control bitmap data using unsafe code,which is working perfectly in 2008 whereas the same code is raising memory access violation exception when run in vs 2010.

The code is as below:

C#

Bitmap canvas = new Bitmap(pictureWater.Width, pictureWater.Height);
BitmapData data = canvas.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);

byte* pixel = (byte*)data.Scan0.ToPointer();
pixel[0] = (byte)0;//blue
pixel[1] = (byte)color;//green
pixel[2] = (byte)0;//red
pixel[3] = (byte)255;

I have verified framework .Net 4.0 using verification tool and succeeded.
The system is running on 32 bit windows XP service pack3

Can anybody help,what might be the problem?

Posted 26-Jun-12 19:05pm

chanu_babu

Updated 26-Jun-12 19:19pm

AmitGajjar

v2

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Bernhard Hiller 27-Jun-12 5:13am

Are pictureWater.Width and width the same? Also height.
Did you try ImageLockMode.ReadWrite?
MicroSoft's example at http://msdn.microsoft.com/en-us/library/5ey6h79d.aspx uses some Marshalling.

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Fun@learn · Answer 1 · 2012-07-03T06:21:00

Solution 2

Instead of

C#

byte* pixel = (byte*)data.Scan0.ToPointer();

use

C#

byte* pixel = (byte*)data.Scan0;

Refer this link[^] for bitmap read write operaton.

Posted 3-Jul-12 6:21am

Fun@learn

chanu_babu · Answer 2 · 2012-07-02T19:51:00

Solution 1

yes, i have tried ImageLockMode.ReadWrite too, but still no use..

and width = canvas.Width;

Posted 2-Jul-12 19:51pm

chanu_babu