提取物iTextSharp的路径和形状 [英] Extract paths and shapes with iTextSharp

问题描述

iTextSharp的支持与 PdfContentByte创建形状和路径类，也可以设置颜色和油漆的曲线和基本要素...有哪些做的其他方式的机制？我可以通过调用 PdfReader.GetPageContent（...）来获取内容，但我没有找到一个解析器阅读这些操作，并将其应用到图形上下文和

iTextSharp supports creation of shapes and paths with PdfContentByte class, there you can set colors and paint curves and basic elements ... is there a mechanism which does the other way? I am able to get content by calling PdfReader.GetPageContent(...) but I didn't find a "parser" to read those operations, apply them to graphics context and for example paint it on a panel.

Example:

例1 RG
1 1 1 RG
0.12 0 0 0.12 1631厘米

Q
480421米
4318421升
4318 5459升
4805459升
480421升W N
0.074509806931 0.074509806931 0.074509806931 RG
0.074509806931 0.074509806931 0.074509806931 RG / OC /过流BDC
....

感谢您的回复！

推荐答案

下面是提取网页的不同命令的起点：

Here is the starting point of extracting the different commands of a page:

    var file = "test.pdf";
    var reader = new PdfReader(file);

    var streamBytes = reader.GetPageContent(2);
    var tokenizer = new PRTokeniser(new RandomAccessFileOrArray(streamBytes));
    var ps = new PdfContentParser(tokenizer);

    List<PdfObject> operands = new List<PdfObject>();
    while (ps.Parse(operands).Count > 0)
    {
        PdfLiteral oper = (PdfLiteral)operands[operands.Count - 1];
        var cmd = oper.ToString();

        switch (cmd)
        {
            case "q":
                Console.WriteLine("SaveGraphicsState(); //q");
                break;

            case "Q":
                Console.WriteLine("RestoreGraphicsState(); //Q");
                break;

           // good luck with the rest!

        }
    }

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