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POMonotouch: Generating UIImage from PDF leaking entire document size
 

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  1. POMonotouch: Generating UIImage from PDF leaking entire document size
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    <p>In a Monotouch application the following code converts a page from a PDF document to a UIImage. It works, but it doesn't correctly dispose the PDF document. </p> <pre><code>public class KillerLeak { public static void RunOnce() { using (CGPDFDocument doc = CGPDFDocument.FromFile("DMSWorkbook.pdf")) { Console.WriteLine("Opened: pages={0}", doc.Pages); UIImage img = GetThumbImage(doc, 1000, 1); img.Dispose(); } GC.Collect(GC.MaxGeneration); GC.WaitForPendingFinalizers(); } private static UIImage GetThumbImage(CGPDFDocument document, float thumbContentSize, int pageNumber) { if ((pageNumber &lt;= 0) || (pageNumber &gt; document.Pages)) { return null; } // Calc page view size SizeF pageSize = new SizeF(768, 1024); if (pageSize.Width % 2 &gt; 0) { pageSize.Width--; } if (pageSize.Height % 2 &gt; 0) { pageSize.Height--; } // Calc target size var targetSize = new Size((int)pageSize.Width, (int)pageSize.Height); // Draw page on CGImage CGImage pageImage; using (CGColorSpace rgb = CGColorSpace.CreateDeviceRGB()) { using (CGBitmapContext context = new CGBitmapContext(null, targetSize.Width, targetSize.Height, 8, 0, rgb, CGBitmapFlags.ByteOrder32Little | CGBitmapFlags.NoneSkipFirst)) { using (CGPDFPage pdfPage = document.GetPage(pageNumber)) { RectangleF thumbRect = new RectangleF(0.0f, 0.0f, targetSize.Width, targetSize.Height); context.SetFillColor(1.0f, 1.0f, 1.0f, 1.0f); context.FillRect(thumbRect); context.ConcatCTM(pdfPage.GetDrawingTransform(CGPDFBox.Crop, thumbRect, 0, true)); context.SetRenderingIntent(CGColorRenderingIntent.Default); context.InterpolationQuality = CGInterpolationQuality.Default; context.DrawPDFPage(pdfPage); pageImage = context.ToImage(); } } } UIImage result = UIImage.FromImage(pageImage); pageImage.Dispose(); return result; } } </code></pre> <p>If I comment out the DrawPDFPage(...) line, the code doesn't leak. Is this a Monotouch bug or am I doing something wrong?</p>
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    1. USDave Weaver
    1. USDave Weaver
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      1. POMonotouch: Generating UIImage from PDF leaking entire document size
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      1. VTUpMod
    1. COYou don't call Dispose on pageImage, that might be it.
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      1. POMonotouch: Generating UIImage from PDF leaking entire document size
      1. USRolf Bjarne Kvinge
    2. CORolf, thanks for pointing that out. I've corrected it in the example code. Turns out the leak is not associated with Monotouch but with the next (beta) version of IOS.
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      1. POMonotouch: Generating UIImage from PDF leaking entire document size
      1. USDave Weaver
 

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