我正在使用iTextSharp从特定矩形内的pdf中获取数据

在高度情况下获取的数据工作正常,但在宽度情况下,返回的是整行而不是矩形中的单词。

我使用的代码如下:

  PdfReader reader = new PdfReader(Home.currentInstance.Get_PDF_URL());
            iTextSharp.text.Rectangle pageRectangle = reader.GetPageSize(currentPage);
            float selection_x = ((float)(selectionRectangle.RenderTransform.Value.OffsetX) / (float)canvas.Width) * pageRectangle.Width;
            float selection_y = pageRectangle.Height - (((float)(selectionRectangle.RenderTransform.Value.OffsetY) / (float)canvas.Height) * pageRectangle.Height);
            float selection_height = ((float)(selectionRectangle.Height) / (float)canvas.Height) * pageRectangle.Height;
            float selection_width = ((float)(selectionRectangle.Width) / (float)canvas.Width) * pageRectangle.Width;
            selection_y -= selection_height;
            RectangleJ rect = new RectangleJ(selection_x,selection_y,selection_width,selection_height);
            RenderFilter[] filter = { new RegionTextRenderFilter(rect) };
            ITextExtractionStrategy strategy;
            strategy = new FilteredTextRenderListener(
           new LocationTextExtractionStrategy(), filter
         );
String pageText = PdfTextExtractor.GetTextFromPage(reader, currentPage, strategy);


任何帮助将不胜感激。

提前致谢

最佳答案

最后,我能够解决问题

我创建了以下课程

public class LimitedTextStrategy : iTextSharp.text.pdf.parser.ITextExtractionStrategy
    {

        public readonly ITextExtractionStrategy textextractionstrategy;

        public LimitedTextStrategy(ITextExtractionStrategy strategy)
        {
            this.textextractionstrategy = strategy;
        }
        public void RenderText(iTextSharp.text.pdf.parser.TextRenderInfo renderInfo)
        {
          foreach (TextRenderInfo info in renderInfo.GetCharacterRenderInfos())
        {
            this.textextractionstrategy.RenderText(info);
        }
        }
        public string GetResultantText()
        {
            return this.textextractionstrategy.GetResultantText();
        }

        public void BeginTextBlock() {
            this.textextractionstrategy.BeginTextBlock();

        }
        public void EndTextBlock() {
            this.textextractionstrategy.EndTextBlock();

        }
        public void RenderImage(ImageRenderInfo renderInfo) {
            this.textextractionstrategy.RenderImage(renderInfo);
        }
    }


然后将提取线更改为

String pageText = PdfTextExtractor.GetTextFromPage(reader, currentPage, new LimitedTextStrategy(strategy));


现在它工作正常。我希望它也能帮助其他人

关于c# - iTextSharp RegionTextRenderFilter在宽度情况下不起作用,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/22110703/

10-11 06:35