te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>c# - How to get shapes from PDF using PDFsharp - Stack Overflow

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    c# - How to get shapes from PDF using PDFsharp - Stack Overflow

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    I have a file and draw a rectangle in it.

    var brush = new XSolidBrush(XColor.FromArgb(255, colorArray.R, colorArray.G, colorArray.B));
XGraphics gfx = XGraphics.FromPdfPage(document.Pages[0]);
gfx.DrawRectangle(brush, xRect);

    Next time I want to get this rectangle and get its color. How can I do this?

    I tried to get

    PdfDictionary resources = document.Pages[0].Elements.GetDictionary("/Resources");
PdfDictionary xObjects = resources.Elements.GetDictionary("/XObject");

    But I didn't find the square I created there. I tried to figure out how to get XGraphics from the page, but I didn't see this information in the documentation.

    Context: I try to mark my file by drawing a small rectangle in the corner of the page with a unique color. Next time I want to get the file and read the color of this rectangle.

    I have a file and draw a rectangle in it.

    var brush = new XSolidBrush(XColor.FromArgb(255, colorArray.R, colorArray.G, colorArray.B));
XGraphics gfx = XGraphics.FromPdfPage(document.Pages[0]);
gfx.DrawRectangle(brush, xRect);

    Next time I want to get this rectangle and get its color. How can I do this?

    I tried to get

    PdfDictionary resources = document.Pages[0].Elements.GetDictionary("/Resources");
PdfDictionary xObjects = resources.Elements.GetDictionary("/XObject");

    But I didn't find the square I created there. I tried to figure out how to get XGraphics from the page, but I didn't see this information in the documentation.

    Context: I try to mark my file by drawing a small rectangle in the corner of the page with a unique color. Next time I want to get the file and read the color of this rectangle.

    • c#
    • pdfsharp
    Share Improve this question edited 2 days ago I liked the old Stack Overflow 21.7k10 gold badges98 silver badges160 bronze badges asked Feb 17 at 14:12 Nikolas McRainNikolas McRain 14 bronze badges New contributor Nikolas McRain is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct. 3
    • Tip: Use a Debug build of PDFsharp and look at the PDF file that was written to disk (using e.g. VS Code or Notepad++ or your text editor of choice). Some items are separate objects in PDF, but text and rectangles (sets of lines) are not. You can download the PDF specification for version 1.7 or 2.0 for further information. – I liked the old Stack Overflow Commented Feb 18 at 6:52
    • @IlikedtheoldStackOverflow yes, thanks for the advice. I'm trying to do that, but I can't turn the data I've received into anything adequate. – Nikolas McRain Commented Feb 18 at 8:54
    • IF your graphics are always generated the same way by the same writer. It should be trivial to see how they are always built by that function, compared to any other function. As PDF lines are simply text and when text is written the same way it has the same output format. The problem comes when any other PDF processor regenerates those lines in a different fashion. Such as a polygon or rectangle or randomly ordered curves (yes curves can be flat) or even 4 straight lines, or ALL of the above for one sub xobject. – K J Commented 2 days ago
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    1 Answer 1

    Reset to default 0

    A typical PDF page has one content stream with post-script instructions that draw what's on the page. For a rectangle you will probably find four lines drawn on the page.

    You have to get the content stream and parse it.

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