Creating thumbnail images using C #

Question

@functions{

    public void GetThumbnailView(string originalImagePath, int height, int width)
    {
        //Consider Image is stored at path like "ProductImage\\Product1.jpg"

        //Now we have created one another folder ProductThumbnail to store thumbnail image of product.
        //So let name of image be same, just change the FolderName while storing image.
        string thumbnailImagePath = originalImagePath;
        originalImagePath = originalImagePath.Replace("thumb_", "");
        //If thumbnail Image is not available, generate it.
        if (!System.IO.File.Exists(Server.MapPath(thumbnailImagePath)))
        {
            System.Drawing.Image imThumbnailImage; 
            System.Drawing.Image OriginalImage = System.Drawing.Image.FromFile(Server.MapPath(originalImagePath));

            double originalWidth = OriginalImage.Width;
            double originalHeight = OriginalImage.Height;

            double ratioX = (double)width / (double)originalWidth;
            double ratioY = (double)height / (double)originalHeight;

            double ratio = ratioX < ratioY ? ratioX : ratioY; // use whichever multiplier is smaller

            // now we can get the new height and width
            int newHeight = Convert.ToInt32(originalHeight * ratio);
            int newWidth = Convert.ToInt32(originalWidth * ratio);

            imThumbnailImage = OriginalImage.GetThumbnailImage(newWidth, newHeight,
                         new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero);
            imThumbnailImage.Save(Server.MapPath(thumbnailImagePath), System.Drawing.Imaging.ImageFormat.Jpeg);

            imThumbnailImage.Dispose();
            OriginalImage.Dispose();
        }

    }

    public bool ThumbnailCallback() { return false; }

}

in another stackowerflow question, I found this code and really liked it, but when using it, there was a problem when creating thumbnails, as shown below:

Server error in application "/".

Not enough memory. Description: An unhandled exception occurred during the execution of the current web request. Browse the trace stack for more information about the error and its occurrence in the code.

Exception Details: System.OutOfMemoryException: Out of memory.

Source Error:

Line 199: {

Line 200: System.Drawing.Image imThumbnailImage;

Line 201: System.Drawing.Image OriginalImage = System.Drawing.Image.FromFile (Server.MapPath (originalImagePath.ToString ()));

Line 202:

Line 203: double originalWidth = OriginalImage.Width;

: c:\Inetpub\wwwroot\Lokal\Views\Stok\SatisRaporu.cshtml
: 201

:

    //
    // Summary:
    //     Creates an System.Drawing.Image from the specified file.
    //
    // Parameters:
    //   filename:
    //     A string that contains the name of the file from which to create the System.Drawing.Image.
    //
    // Returns:
    //     The System.Drawing.Image this method creates.
    //
    // Exceptions:
    //   System.OutOfMemoryException:
    //     The file does not have a valid image format.-or- GDI+ does not support the
    //     pixel format of the file.
    //
    //   System.IO.FileNotFoundException:
    //     The specified file does not exist.
    //
    //   System.ArgumentException:
    //     filename is a System.Uri.
    [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
    public static Image FromFile(string filename);

".jpg" , . ".jpg" , ?

, - ".jpg" ? , ?

: . # .

:

:

GetThumbnailView("../pics/thumb_" + (("0000000" + stocks.stockcode).Substring(("0000000" + stocks.stockcode).Length - 7, 7)) + ".jpg", 200, 200);

Answer 1

, , , API- WPF GDI+. : WindowsBase, PresentationFramework PresentationCore. :

try
{
    using (var input = File.Open(inputFilename, FileMode.Open, FileAccess.Read, FileShare.Read))
    using (var thumb = File.Open(thumbFilename, FileMode.Create, FileAccess.Write, FileShare.None))
    {
        Thumbnail(input, thumb, 200, 100);
    }
}
catch (MyException)
{
    File.Delete(thumbFilename);
}

200x100, .

( - . POST . . , , . " " .)

- , , , , - , . , JPEG, , JPEG PNG. .

private static void Thumbnail(Stream source, Stream destination, int maxWidth, int maxHeight)
{
    int width = 0, height = 0;
    BitmapFrame frame = null;
    try
    {
        frame = BitmapDecoder.Create(source, BitmapCreateOptions.None, BitmapCacheOption.None).Frames[0];
        width = frame.PixelWidth;
        height = frame.PixelHeight;
    }
    catch
    {
        throw new MyException("The image file is not in any of the supported image formats.");
    }

    if (width > AbsoluteLargestUploadWidth || height > AbsoluteLargestUploadHeight)
        throw new MyException("This image is too large");

    try
    {
        int targetWidth, targetHeight;
        ResizeWithAspect(width, height, maxWidth, maxHeight, out targetWidth, out targetHeight);

        BitmapFrame targetFrame;
        if (frame.PixelWidth == targetWidth && frame.PixelHeight == targetHeight)
            targetFrame = frame;
        else
        {
            var group = new DrawingGroup();
            RenderOptions.SetBitmapScalingMode(group, BitmapScalingMode.HighQuality);
            group.Children.Add(new ImageDrawing(frame, new Rect(0, 0, targetWidth, targetHeight)));
            var targetVisual = new DrawingVisual();
            var targetContext = targetVisual.RenderOpen();
            targetContext.DrawDrawing(group);
            var target = new RenderTargetBitmap(targetWidth, targetHeight, 96, 96, PixelFormats.Default);
            targetContext.Close();
            target.Render(targetVisual);
            targetFrame = BitmapFrame.Create(target);
        }

        var enc = new JpegBitmapEncoder();
        enc.Frames.Add(targetFrame);
        enc.QualityLevel = 80;
        enc.Save(destination);
    }
    catch
    {
        throw new MyException("The image file appears to be corrupt.");
    }
}

/// <summary>Generic helper to compute width/height that fit into specified maxima while preserving aspect ratio.</summary>
public static void ResizeWithAspect(int origWidth, int origHeight, int maxWidth, int maxHeight, out int sizedWidth, out int sizedHeight)
{
    if (origWidth < maxWidth && origHeight < maxHeight)
    {
        sizedWidth = origWidth;
        sizedHeight = origHeight;
        return;
    }

    sizedWidth = maxWidth;
    sizedHeight = (int) ((double) origHeight / origWidth * sizedWidth + 0.5);
    if (sizedHeight > maxHeight)
    {
        sizedHeight = maxHeight;
        sizedWidth = (int) ((double) origWidth / origHeight * sizedHeight + 0.5);
    }
}

Answer 2

, , . , jpgs . OutOfMemory .

, , . , - X , .

. : SO # 6506089 SO # 1108607 SO # 1644108 SO # 9237457

, , OutOfMemoryException , . : Image.FromFile OutOfMemoryException ?