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POCreating thumbnail images with C#
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  1. POCreating thumbnail images with C#
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    copied!<pre><code>@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 &lt; 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; } } </code></pre> <p>in another stackowerflow question i found this code and really liked it but while using it there was a problem occured while creating the thumbnail images as shown below:</p> <blockquote> <h2>Server Error in '/' Application.</h2> <p>Out of memory. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. </p> <p>Exception Details: System.OutOfMemoryException: Out of memory.</p> <p>Source Error: </p> <p>Line 199: {</p> <p>Line 200: System.Drawing.Image imThumbnailImage;</p> <p>Line 201: System.Drawing.Image OriginalImage = System.Drawing.Image.FromFile(Server.MapPath(originalImagePath.ToString()));</p> <p>Line 202:</p> <p>Line 203: double originalWidth = OriginalImage.Width; </p> <p>Source File: c:\Inetpub\wwwroot\Lokal\Views\Stok\SatisRaporu.cshtml<br> Line: 201</p> </blockquote> <p>my curiosity about this issue got me into the exception details and seen this :</p> <pre><code> // // 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); </code></pre> <p>but all my pictures in that folder has ".jpg" extention so it seems wierd to me. if im not gonna be able to create thumbnails from ".jpg" what else i can do?</p> <p>I actually want to learn about if anyone else tried this on ".jpg" files and got a problem with it? and If no problem occured what i might be doing wrong?</p> <p>A little note: I do this in a view using razor syntax. I know a little about c# language and improving my knowledge about it everyday.</p> <p><strong>Edit :</strong></p> <p>How i call the function: </p> <pre><code>GetThumbnailView("../pics/thumb_" + (("0000000" + stocks.stockcode).Substring(("0000000" + stocks.stockcode).Length - 7, 7)) + ".jpg", 200, 200); </code></pre>
 

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