iTextSharp RegionTextRenderFilter在宽度的情况下不起作用

Question

我正在使用iTextSharp从特定矩形内的pdf中获取数据

在高度的情况下获取的数据工作正常但在宽度的情况下,它返回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);

任何帮助将受到高度赞赏.

提前致谢

Answer 1

最后,我能够解决这个问题

我创建了以下类

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.我希望它也可以帮助别人