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Memory leak in PdfText.Find when no search results returned? - mhook
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mhook  
#1 Posted : Wednesday, September 25, 2019 10:14:14 AM(UTC)
mhook

Rank: Newbie

Groups: Registered
Joined: 9/25/2019(UTC)
Posts: 1
Italy
I am evaluating the Pdfium.Net for use in my organization and was surprised by a memory failure. The test PDF is a large file, ~200 pages of an industrial supply catalog, in which I am searching for a large number of products. This means iterative searches and a high percentage of searches that return no results.

I've reduced the code to the following and the memory leak continues. A single execution of this routine and process memory rises 750 MB. However, if I replace the search text with a value that is actually on the page, the process memory change is negligible.

I interpret this to mean that PdfText.Find() is not disposing of resources when it returns null (i.e., no results).

Is there another way I can structure my search to avoid the problem? Is this a bug that can be fixed quickly? I am testing with version 4.17.2704 downloaded through NuGet just now.

Code:

private void button1_Click(object sender, EventArgs e)
{
    PdfCommon.Initialize();

    catalog = PdfDocument.Load(textBoxCatalogFile.Text);

    PdfPage page = catalog.Pages[4];

    for (int i = 0; i < 100000; i++)
    {
        PdfFind results = page.Text.Find("NotOnThePage", FindFlags.MatchWholeWord, 0);
        if (results != null)
        {
            // Do something

            results.Dispose();
        }
    }

    page.Dispose();

    catalog.Dispose();
}


Thank you
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Paul Rayman  
#2 Posted : Wednesday, September 25, 2019 9:17:11 PM(UTC)
Paul Rayman

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Joined: 1/5/2016(UTC)
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Fixed.
https://forum.patagames....n-Sep--26--2019#post1795

Thanks a lot for bug report!
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