iTextSharp：展平表格单元格中的字段会向上移动文本

问题描述

我遇到了对表格单元格中生成的字段进行展平的问题。我已经创建了一个示例项目来说明问题。

I'm having an issue with flattening fields that were generated in a table cell. I've created a sample project to illustrate the issue.

private static void dummyFunction2()
    {
        // Create a PDF with a TextBox in a table cell
        //Get the font ready
        BaseFont bfHelvetica = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1250, false);
        var helvetica12 = new Font(bfHelvetica, 12, Font.NORMAL, BaseColor.BLACK);

        //Create the document and filestream
        var doc = new Document(PageSize.LETTER, 18f, 18f, 18f, 18f);
        var fs = new FileStream("TextBoxInTableCell.pdf", FileMode.Create);
        PdfWriter writer = PdfWriter.GetInstance(doc, fs);

        //Create the table
        doc.Open();
        var myTable = new PdfPTable(1);
        myTable.TotalWidth = 568f;
        myTable.LockedWidth = true;
        myTable.HorizontalAlignment = 0;

        //Create the textfield that will sit on a cell in the table
        var tf = new TextField(writer, new Rectangle(67, 585, 140, 800), "cellTextBox");
        tf.Text = "test";
        //Create the table cell
        var tbCell = new PdfPCell(new Phrase(" ", helvetica12));
        //Use fieldpositioningevents to make the field appear on top of the cell
        var events =
            new FieldPositioningEvents(writer, tf.GetTextField());
        tbCell.CellEvent = events;
        //Add the cell to the table
        myTable.AddCell(tbCell);
        PdfContentByte cb = writer.DirectContent;
        //Write out the table to the middle of the document
        myTable.WriteSelectedRows(0, -1, 0, -1, 0, 400, cb);
        doc.Close();
        fs.Close();

        //Open back up the document so that we can set GenerateAppearances to false.
        //This solution proposed and accepted at https://stackoverflow.com/questions/25169342/itextsharp-fields-generated-in-a-table-not-shown-in-adobe-reader
        var reader2 = new PdfReader("TextBoxInTableCell.pdf");
        var stamper2 = new PdfStamper(reader2, new FileStream("tempdoc.pdf", FileMode.Create));
        stamper2.AcroFields.GenerateAppearances = false;
        stamper2.Close();
        reader2.Close();
        Process.Start("tempdoc.pdf");

        //Open the pdf back up
        var reader = new PdfReader("tempdoc.pdf");
        var stamper = new PdfStamper(reader, new FileStream("tempdoc.pdf" + "1.pdf", FileMode.Create));

        //Flatten the form
        stamper.FormFlattening = true;

        //Close everything
        stamper.Close();
        reader.Close();
        Process.Start("tempdoc.pdf" + "1.pdf");
    }

生成的这个unflattened pdf看起来像。正如您所看到的，该字段应该是它应该存在的位置。然而，展平的pdf看起来像。该字段的文本已被移动了一个显着的数量。

This unflattened pdf that is generated looks like . As you can see, the field is where it should be. The flattened pdf, however, looks like . The field's text has been shifted a noticeable amount.

我，以便有人可以在需要时查看pdf语言。

I've posted the flattened pdf so that someone can check out the pdf language if needed.

我知道这是一个利基问题，但希望有人可以帮助我。

I know this is sort of a niche issue but hopefully someone can help me out.

EDIT1：In回应Bruno的评论，我正在使用从Nuget下载的iTextsharp 5.5.2，可以找到unflattened pdf

In response to Bruno's comment, I'm using iTextsharp 5.5.2 downloaded from Nuget and the unflattened pdf can be found here.

EDIT2：更新了SO链接以指向正确的问题。以下是我之前提到的与此问题相关的两个问题：，

Updated SO link to point to the correct question. For reference here are my two previous questions that relate to this problem: First, Second

推荐答案

iText的Java版本不包含此问题。这是一个Java - > C＃移植问题。我们会照顾好。

Java version of iText does not contain this problem. It's a Java -> C# porting issue. We'll take care of that.

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