如何使用iTextSharp向现有pdf中添加表单字段?
我有一个现有的pdf文档,希望在其中添加表单字段,而不需要创建副本并写入新文档。
我有一个现有的pdf文档,希望在其中添加表单字段,而不需要创建副本并写入新文档。
public void ABetterWayToAddFormFieldToExistingPDF( )
{
PdfReader reader = new PdfReader(@"c:\existing.pdf");
FileStream out = new FileStream(@"C:\existingPlusFields.pdf", FileMode.Create, FileAccess.Write);
PdfStamper stamp = new PdfStamper(reader, out);
TextField field = new TextField(stamp.Writer, new iTextSharp.text.Rectangle(40, 500, 360, 530), "some_text");
// add the field here, the second param is the page you want it on
stamp.AddAnnotation(field.GetTextField(), 1);
stamp.FormFlattening = true; // lock fields and prevent further edits.
stamp.Close();
}
我曾经为此苦苦挣扎,所以决定发布这个问题和答案。
使用itext的PdfStamper类是关键。(我猜这确实会创建一个副本,但比使用itext的PdfCopy类更加干净)。
public void AddFormFieldToExistingPDF( )
{
PdfReader reader = new PdfReader(@"c:\existing.pdf");
FileStream out = new FileStream(@"C:\existingPlusFields.pdf", FileMode.Create, FileAccess.Write);
PdfStamper stamp = new PdfStamper(reader, out);
PdfFormField field = PdfFormField.CreateTextField(stamp.Writer, false, false, 50);
// set a field w/some position and size
field.SetWidget(new iTextSharp.text.Rectangle(40, 500, 360, 530),
PdfAnnotation.HIGHLIGHT_INVERT);
field.SetFieldFlags(PdfAnnotation.FLAGS_PRINT);
field.FieldName = "some_field";
// add the field here, the second param is the page you want it on
stamp.AddAnnotation(field, 1);
stamp.Close();
}
PdfStamper Stamper= new PdfStamper(new PdfReader(sourcefile), File.Create(NewOutputFile));
TextField moreText = new TextField(Stamper.Writer,
new iTextSharp.text.Rectangle(20, 20, 590, 780), "moreText");
moreText.Visibility = TextField.VISIBLE_BUT_DOES_NOT_PRINT;
moreText.Text = "Use this space for any additional information";
moreText.Options = (TextField.MULTILINE);
PdfFormField Fieldtxt = moreText.GetTextField();
Stamper.AddAnnotation(Fieldtxt, n);