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我有一个使用 itextsharp 填充 PDF 表单域的应用程序。

我从客户那里得到了新的要求,允许在字段值下划线。

我已经阅读了很多帖子,包括这个网站上问题的答案,但我想不出办法。

当前我的代码执行以下操作:

  1. 创建一个 PDFStamper 实例
  2. 使用 stamper.AcroFields 属性获取表单字段
  3. 使用 AcroFields.SetFieldRichValue() 方法设置字段值。

但是当我打开 PDF 时,该字段为空。

我验证了该字段在 PDF 本身中设置为富文本。

知道我做错了什么吗?

这是我的代码的片段:

                FileStream stream = File.Open(targetFile, FileMode.Create);                                     
                var pdfStamper = new PdfStamper(new PdfReader(sourceFile), stream);                     

                // Iterate the fields in the PDF
                foreach (var fieldName in pdfStamper.AcroFields.Fields.Keys)
                {                       
                    // Get the field value of the current field
                    var fieldValue = "<?xml version=\"1.0\"?><body xmlns=\"http://www.w3.org/1999/xtml\" xmlns:xfa=\"http://www.xfa.org/schema/xfa-data/1.0/\" xfa:contentType=\"text/html\" xfa:APIVersion=\"Acrobat:8.0.0\" xfa:spec=\"2.4\"><p style=\"text-align:left\"><b><i>Here is some bold italic text</i></b></p><p style= \"font-size:16pt\">This text uses default text state parameters but changes the font size to 16.</p></body>"

                    // Set the field value
                    if (String.IsNullOrEmpty(fieldValue) == false)
                    {
                        pdfStamper.AcroFields.SetFieldRichValue(key, fieldValue);
                    }
                }

编辑:

我已经根据 Mark Storer 的帖子修改了我的代码到一个问题(http://stackoverflow.com/questions/1454701/adding-rich-text-to-an-acrofield-in-itextsharp)。新代码是:

        // Create reader to read the source file
        var reader = new PdfReader(sourceFile);

        // Create a stream for the generated file
        var stream = File.Open(targetFile, FileMode.Create); 

        // Create stamper to generate the new file
        var pdfStamper = new PdfStamper(reader, stream);

        // Field name and value
        var fieldName = "myfield";
        var fieldValue = "<?xml version=\"1.0\"?><body xfa:APIVersion=\"Acroform:2.7.0.0\" xfa:spec=\"2.1\" xmlns=\"http://www.w3.org/1999/xhtml\" xmlns:xfa=\"http://www.xfa.org/schema/xfa-data/1.0/\"><p dir=\"ltr\" style=\"margin-top:0pt;margin-bottom:0pt;font-family:Helvetica;font-size:12pt\"><b>write line1 bold</b></p</body>";

        // Output stream for the temporary file that should contain the apearance of the field
        var msOutput = new FileStream(@"d:\temp.pdf", FileMode.Create);

        // string reader to read the field value
        var textReader = new StringReader(fieldValue);

        // Create new document
        var document = new Document(pdfStamper.AcroFields.GetFieldPositions(fieldName)[0].position);

         // writer for the new doucment
        var writer = PdfWriter.GetInstance(document, msOutput);

        // Open the document                
        document.Open();

        // Get elements to append to the doucment
        var list = HTMLWorker.ParseToList(textReader, null);

        // Append elements to the doucment
        foreach (var element in list)
        {
            document.Add(element);
        }                                           

        // close the documnet
        document.Close();                            

        // Append push button that contains the generated content as its apearance
        // this approach is based on the suggestion from Mark storer that can be found in:
        // http://stackoverflow.com/questions/1454701/adding-rich-text-to-an-acrofield-in-itextsharp
        var button = new PushbuttonField(pdfStamper.Writer, pdfStamper.AcroFields.GetFieldPositions(fieldName)[0].position, fieldName + "_")
                             {
                                 Layout = PushbuttonField.LAYOUT_ICON_ONLY,
                                 BackgroundColor = null,
                                 Template = pdfStamper.Writer.GetImportedPage(new PdfReader(targetFile, 1)
                             };
            pdfStamper.AddAnnotation(button.Field, 1);                

        pdfStamper.FormFlattening = true;
        pdfStamper.Close();
        pdfStamper.Dispose();

但是现在的问题是临时文件不包含任何内容......

有任何想法吗 ?

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2 回答 2

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我设法用小技巧解决了它 - 我在 ColumnText 元素中使用了 Anchor (hyperling)元素并将其放置在表单字段上方。默认情况下,锚点显示为带下划线。为了避免用户将鼠标悬停在锚点上时出现手形标记,我将锚点的“参考”属性设置为空。

这是我使用的代码:

 // Create reader
 var reader = new PdfReader(sourceFilePathAndName);

 // Create stream for the target file
 var stream = File.Open(targetFilePathAndName, FileMode.Create); 

 // Create the stamper
 var pdfStamper = new PdfStamper(reader, stream);

 const string fieldName = "MyField";     

 // Get the position of the field
 var targetPosition = pdfStamper.AcroFields.GetFieldPositions(fieldName)[0].position;

 // Set the font
 var fontNormal = FontFactory.GetFont("Arial", 16, Font.UNDERLINE, BaseColor.BLACK);

 // Create the anchor
 var url = new Anchor("some default text", fontNormal) { Reference = null };

 // Create the element that will contain the anchor and allow to position it anywhere on the document
 var data = new ColumnText(pdfStamper.GetOverContent(1));

 // Add the anchor to its container
 data.SetSimpleColumn(url, targetPosition.Left, targetPosition.Bottom, targetPosition.Right, targetPosition.Top, 0, 0);

 // Write the content to the document
 data.Go();

 pdfStamper.FormFlattening = true;
 pdfStamper.Close();
 pdfStamper.Dispose();
于 2012-05-03T13:16:15.613 回答
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上面有很多代码,将近 400 行。将来,尝试将所有内容提炼成一个非常简单且可重现的测试用例。

使用SetFieldRichValue时还需要将PdfStamper' AcroFields.GenerateAppearances属性设置为false

stamper.AcroFields.GenerateAppearances = false;

您可以在此处阅读有关此内容的更多信息以及一些注意事项和其他解决方法。

于 2012-05-01T13:11:53.590 回答