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    <p>Not sure where the problem in your code is, but here's my code for generating thumbs of PDF pages. It is working flawlessly. Maybe it helps you. I think your issue might be what you are doing with the returned image when you're don.</p> <pre><code>public static UIImageView GetLowResPagePreview (CGPDFPage oPdfPage, RectangleF oTargetRect) { RectangleF oOriginalPdfPageRect = oPdfPage.GetBoxRect (CGPDFBox.Media); RectangleF oPdfPageRect = PdfViewerHelpers.RotateRectangle( oPdfPage.GetBoxRect (CGPDFBox.Media), oPdfPage.RotationAngle); // Create a low res image representation of the PDF page to display before the TiledPDFView // renders its content. int iWidth = Convert.ToInt32 ( oPdfPageRect.Size.Width ); int iHeight = Convert.ToInt32 ( oPdfPageRect.Size.Height ); CGColorSpace oColorSpace = CGColorSpace.CreateDeviceRGB(); CGBitmapContext oContext = new CGBitmapContext(null, iWidth, iHeight, 8, iWidth * 4, oColorSpace, CGImageAlphaInfo.PremultipliedLast); // First fill the background with white. oContext.SetFillColor (1.0f, 1.0f, 1.0f, 1.0f); oContext.FillRect (oOriginalPdfPageRect); // Scale the context so that the PDF page is rendered // at the correct size for the zoom level. oContext.ConcatCTM ( oPdfPage.GetDrawingTransform ( CGPDFBox.Media, oPdfPageRect, 0, true ) ); oContext.DrawPDFPage (oPdfPage); CGImage oImage = oContext.ToImage(); UIImage oBackgroundImage = UIImage.FromImage( oImage ); oContext.Dispose(); oImage.Dispose (); oColorSpace.Dispose (); UIImageView oBackgroundImageView = new UIImageView (oBackgroundImage); oBackgroundImageView.Frame = new RectangleF (new PointF (0, 0), oPdfPageRect.Size); oBackgroundImageView.ContentMode = UIViewContentMode.ScaleToFill; oBackgroundImageView.UserInteractionEnabled = false; oBackgroundImageView.AutoresizingMask = UIViewAutoresizing.None; return oBackgroundImageView; } </code></pre>
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    1. POMonoTouch: Memory leak when drawing PDF on a custom graphics context
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    1. COUsing a CGBitmapContext fixed the memory issues and also makes it possible to perform the process outside the main thread, which is a *considerable* boon. I had some problems figuring out the CGImageAlphaInfo and got a few "invalid handle" exceptions for some reason, but it seemed to fix itself after a few recompiles (or maybe I did something, who knows). Thanks!
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    2. COWhat is PdfViewerHelpers? Is that a custom class of yours?
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      1. USEmanuele Sabetta
    3. COYeah. Sorry. I missed to remove that. It is rotating a rectangle by 90, 180 or 270 degrees by swapping the coordinates accordingly.
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