Re: Searching for text in PDF files is wrong

[Emmanuele Bassi <ebassi gmail com>]

Hi;

this list is for the development of applications with GTK; your question
relates to Poppler, so you should ask on a Poppler-related mailing list or
developers forum, e.g.
https://lists.freedesktop.org/mailman/listinfo/poppler

Ciao,
 Emmanuele.

On Fri, 30 Nov 2018 at 20:56, Радомир Хаџић via gtk-app-devel-list <
gtk-app-devel-list gnome org> wrote:

> Hi.
>
> I use poppler_page_find_text() to find text in PDF files. This returns
> GList of pointers to PopplerRectangles. Then I use
> poppler_page_render_selection() to mark the found text.
>
> What is wrong is that PopplerRectangles returned by
> poppler_page_find_text() are incompatible with those that
> poppler_page_render_selection() requests, which is why the wrong text
> is selected.
>
> I have found that to make those two compatible, I have to do the
> following to PopplerRectangles returned by poppler_page_find_text():
> 1) SWAP(rectangle.x1, rectangle.x2);
> 2) SWAP(rectangle.y1, rectangle.y2);
> 3) rectangle.y1 = page_height - rectangle.y1;
> 4) rectangle.y2 = page_height - rectangle.y2;
> But this does not solve the problem because the marked text cycles
> between right and wrong again while resizing the window.
>
> I have created a small program that illustrates the problem. Here it
> is: https://pastebin.com/h3F56Yv7 (I've also sent an attachment but
> last time you didn't get it so this paste is a fallback in case you
> don't get it again.)
> You ought to supply two arguments when running the program: the
> absolute path to a PDF file and the text you want to search for,
> respectively. Pay attention to the selected text with and without
> lines 54-57.
>
> How can I make the found text to be marked properly? This "workaround"
> does not work very well and it is an ugly solution anyway.
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