C# - Loading a Large JPEG file (> 2Mb) - Memory Issue

C# - Loading a Large JPEG file (> 2Mb) - Memory Issue

• Kumar Shetgar

  The Imaging libraries in the SDF v2 should be able to do that.

  http://www.opennetcf.org/sdf

  Take a look at Alex's blog for details:

  http://blog.opennetcf.org/afeinman/

  
  

• George Longmire

  Thanks for the suggestion to debug the code, but as mentioned in the original question, I'm not familiar with c++, and 2 didn't find any project options in the c++ dll code/project that allowed starting the project as a separate instance of the IDE. i will make a post to the newsgroup, but there must be another way....
  
  

• Vasily Sokolov

  Ilya - Thanks for the link. I downloaded the example application, and gave it a whirl, however it didn't work either. I changed the location of the file to open to be my file, and I ran the application. It successfully popped up a message indicating the dimensions of the image, however the attempt to load the file failed (with no reason given). The return 'data' variable from the C++ DLL function call returned 0 bytes.
  
  
  

• Jim Harrison IsaDewd

  Excellent! That worked. Thank you for that Alex.

  Here are the steps that i followed to get it working:

  1. Go to http://www.opennetcf.org/PermaLink.aspx guid=d57ace50-2762-4b19-b07d-39421829d410 and download the Download the SDF 2.0 Beta1 Redistributables. Install.
  2. Create a Smart Device Project in VS.NET 2005 targeting PPC 2003 SE device. I had to right-click my project and choose "Upgrade" to ensure it was targetting the .NET CF v2.0 rather than .NET CF 1.1 SP3.
  3. I added the OpenNETCF.dll and OpenNETCF.Drawing.dll files as references from the default installation directory (C:\Program Files\OpenNETCF\Smart Device Framework 2.0\)
  4. I created a simple app with a picturebox on a form, that loads my image when the form is loaded. Here's the relevant code, some copied from Alex Feinman's web log:

  
  #region Using directives
  using System;
  using System.Drawing;
  using System.Collections;
  using System.Windows.Forms;
  using System.Runtime.InteropServices;
  using OpenNETCF.Drawing.Imaging;
  using System.IO;
  #endregion

  ....
  
  const string szFileName = @"\Storage Card\TEMP\2MBJPEG.JPG";

  
  private void Form1_Load(object sender, EventArgs e)
  {
  IBitmapImage imageBitmap;
  FileStream fsImage;
  fsImage = new FileStream(
  szFileName,
  FileMode.Open);
  imageBitmap = CreateThumbnail(
  fsImage,
  new Size(100, 100));
  
  Bitmap bm = ImageUtils.IBitmapImageToBitmap(
  imageBitmap);
  pictureBox1.Image = bm;
  }

  
  static public IBitmapImage CreateThumbnail(Stream stream, Size size)
  {
  IBitmapImage imageBitmap;
  ImageInfo ii;
  IImage image;
  ImagingFactory factory = new ImagingFactoryClass();
  factory.CreateImageFromStream(
  new StreamOnFile(stream),
  out image);
  image.GetImageInfo(out ii);
  factory.CreateBitmapFromImage(
  image,
  (uint)size.Width,
  (uint)size.Height,
  ii.PixelFormat,
  InterpolationHint.InterpolationHintDefault,
  out imageBitmap);
  return imageBitmap;
  }
  

  
  
  

• bakerbud9

  Is anyone else able to get the sample posted (http://www.alexfeinman.com/download.asp doc=LoadBitmap.zip) working with large images
  
  

• CYH24937

  Please see this:

  http://groups.google.com/group/microsoft.public.dotnet.framework.compactframework/browse_frm/thread/f689578f13b24825/58a6bf7395948c0c#58a6bf7395948c0c

  
  
  

• Frank I.

  I would suggest posting question about that on the mentioned NG. Or you can debug the code and find our what's going on.

  
  
  
• C# - Loading a Large JPEG file (> 2Mb) - Memory Issue