I've been looking for old post and I found this:
"Hi Bruno!
I am developing a web-application to edit and customize PDF-form fields
(especially textfields and pushbuttons as container for images) with
the help of iText. Therefore I need information about the fields of an
existing pdf-document. The latest version of iText contains the method
getNewPushbuttonFromField(String field). With the help of this method I
can get nearly all information I need about pushbuttons. For other
fieldtypes there is no such method. I added the following method to the
AcroFields class to get the needed information for other fieldtypes:
public TextField getNewTextFieldFromField(String field) {
try {
float[] pos = getFieldPositions(field);
Rectangle box = new Rectangle(pos[1], pos[2], pos[3],
pos[4]);
TextField newTextField = new TextField(writer, box, null);
Item item = (Item)fields.get(field);
PdfDictionary dic = (PdfDictionary)item.merged.get(0);
decodeGenericDictionary(dic, newTextField);
if(newTextField.getFont() == null)
{
PdfString da =
(PdfString)PdfReader.getPdfObject(dic.get(PdfName.DA));
if (da != null)
{
Object dab[] =
splitDAelements(da.toUnicodeString());
if (dab[DA_FONT] != null)
newTextField.setText(String.valueOf(dab[DA_FONT]));
}
}
return newTextField;
}
catch (Exception e) {
throw new ExceptionConverter(e);
}
}
As in the getNewPushbuttonFromField-method the non-public method
decodeGenericDictionary(PdfDictionary merged, BaseField tx) does the work,
and if the used font is not a DocumentFont the dab-object contains the
fontname of the DA-entry after calling the method splitDAelements(String
da).
This works fine (a lot of documents were tested). Is there something I
do not see that could cause problems? Or is it possible to add this
method to a new version?
With best regards,
Joachim
"
This method do exactly what I need. I put this code on source code of
iTextSharp to test. There's some plan to have this in a later version, because
at the class AcroFields there is a method that do like this, but for
PushButtonField
(AcroFields.GetNewPushbuttonFromField).
For now, I'll compile the iTextSharp with this method, but would be
interesting if new releases cames with a method like this, so when thre is a
new release, I don't need to insert this method again and compile the library.
Thanks
Rodrigo
Paulo Soares <[EMAIL PROTECTED]> escreveu:
Look at AcroFields source code. You'll need the pdf reference to understand
what's going on.
Paulo
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Develop
> Sent: Tuesday, March 06, 2007 4:40 PM
> To: itext-questions@lists.sourceforge.net
> Subject: [iText-questions] Get information from AcroForms
>
> Hi,
>
> I need to get information from acroforms. I need to read an
> PDF and identify textfield and buttonfiled. This I can do
> following the examples and I can get informations from positions.
> But I need get some extra information like rotation, text
> color, font name, font size, etc for textfield, and rotation,
> etc for buttonfield.
> At iTextSharp we have a class named TextField that I think
> can be filled with information from a textfiled form, but I
> don't know how to do this.
> I'm using PdfReader to open the document.
>
> Here is a peace of the code:
>
> PdfReader reader = new PdfReader("c:\\temp\\form.pdf");
> AcroFields form = reader.AcroFields;
> Hashtable fields = form.Fields;
> String key;
> foreach (DictionaryEntry de in fields)
> {
> key = de.Key.ToString();
> switch (form.GetFieldType(key))
> {
> case AcroFields.FIELD_TYPE_PUSHBUTTON:
> Console.WriteLine("Pushbutton");
> float[] positions2 = form.GetFieldPositions(key);
> for (int i = 0; i < positions2.Length; i++)
> {
> Console.WriteLine(positions2[i].ToString());
> }
> //I need more information here
> break;
> case AcroFields.FIELD_TYPE_TEXT:
> Console.WriteLine("Text");
> float[] positions = form.GetFieldPositions(key);
> for (int i = 0; i < positions.Length; i++)
> {
> Console.WriteLine(positions[i].ToString());
> }
> //I need more information here
> }
> }
>
>
> Thanks
>
> Rodrigo
>
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