Hi,

there is a code

using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.IO.Compression;
using System.Windows.Forms;

namespace TestImageTypeSize
{
  class Program
  {
    static void Main()
    {
      ImageFormat[ ] formats = new[ ] { ImageFormat.Gif, ImageFormat.Jpeg,
ImageFormat.Png };

      int screenId = 0;
      foreach (Screen screen in Screen.AllScreens)
      {
        Bitmap bmp = new Bitmap(screen.Bounds.Width, screen.Bounds.Height);
        Graphics g = Graphics.FromImage(bmp);

        g.CopyFromScreen(screen.Bounds.X, screen.Bounds.Y, 0, 0, new
Size(screen.Bounds.Width, screen.Bounds.Height));

        foreach (ImageFormat format in formats)
        {
          string filename = @"t:\screen_" + screenId + "." + format;

          bmp.Save(filename, format);

          FileStream fileStream = new FileStream(filename + ".zip",
FileMode.Create, FileAccess.ReadWrite);
          GZipStream gZipStream = new GZipStream(fileStream,
CompressionMode.Compress);
          bmp.Save(gZipStream, format);
          gZipStream.Close();
        }

        screenId++;
      }
    }
  }
}

which falls in line
bmp.Save(gZipStream, format);with exception
A generic error occurred in GDI+
What's error?


http://www.alvas.net - Audio tools for C# and VB.Net developers + Christmas
Gift

Alexander Vasilevsky wrote:
8< snip

Perhaps because you are using the same filename for all three files?

Why would you want to zip the files? The image formats are already
compressed, so you will not be able to get any significant compression.
Some files may even get larger if you zip them.

Show quote Hide quote I have checcked you code and it seems perfect to me.
I believe this is a bug in Framework.

The call to bmp.Save() succeeds only when Image Formats are Gif and
Jpeg. For all other formats it fails.
As a work around. you can always create a file from that Bitmap Object
and then compress it.

below is a code that will do if for you.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.IO.Compression;
using System.Windows.Forms;

namespace TestImageTypeSize
{
    class Program
    {
        static void Main()
        {
            ImageFormat[] formats = new[] { ImageFormat.Gif,
ImageFormat.Jpeg,
ImageFormat.Png};

            int screenId = 0;
            foreach (Screen screen in Screen.AllScreens)
            {
                Bitmap bmp = new Bitmap(screen.Bounds.Width,
screen.Bounds.Height);
                Graphics g = Graphics.FromImage(bmp);

                g.CopyFromScreen(screen.Bounds.X, screen.Bounds.Y, 0,
0, new
        Size(screen.Bounds.Width, screen.Bounds.Height));

                g.Flush();

                foreach (ImageFormat format in formats)
                {
                    string filename = @"D:\screen_" + screenId + "." +
format;

                    bmp.Save(filename, format);

                    FileStream fileStream = new FileStream(filename +
".zip",
          FileMode.Create, FileAccess.ReadWrite);
                    GZipStream gZipStream = new GZipStream(fileStream,
          CompressionMode.Compress);

// My Code Starts Here

                    FileStream fs = new FileStream(filename,
FileMode.Open);
                    Byte[] bt = new byte[fs.Length];
                    fs.Read(bt,0,bt.Length);
                    fs.Close();

                    gZipStream.Write(bt, 0, bt.Length);
//My Code End here
                    gZipStream.Close();
                    fileStream.Close();
                }

                screenId++;
            }
        }
    }

}

Is this syntax (using new without specifying the object) new to C# 3.0?
Because I like it! I've always thought you should be able to do this

    MyClass c = new(param1, param2);

instead of the redundant

    MyClass c = new MyClass(param1, param2);

Show quote Hide quote Aw, rats. Testing shows that the array syntax is allowed but you still have
to use the wordy syntax for classes. And yes, it's apparently new to C# 3.0,
although I don't find any references to it in the documentation for the new
operator. Hmmm, does this fall under the "Collection Initializers" topic?

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