// ---------------------------------------------------------------------------
/**
* Manipulates a PDF file src with the file dest as result
* @param src the original PDF
*/
public byte[] ManipulatePdf(byte[] src)
{
PdfReader reader = new PdfReader(src);
using (MemoryStream ms = new MemoryStream()) {
using (PdfStamper stamper = new PdfStamper(reader, ms)) {
AcroFields form = stamper.AcroFields;
form.SetField("choice_1", "NL");
form.SetListSelection("choice_2", new String[] { "German", "Spanish" });
String[] languages = form.GetListOptionDisplay("choice_3");
String[] exportvalues = form.GetListOptionExport("choice_3");
int n = languages.Length;
String[] new_languages = new String[n + 2];
String[] new_exportvalues = new String[n + 2];
for (int i = 0; i < n; i++)
{
new_languages[i] = languages[i];
new_exportvalues[i] = exportvalues[i];
}
new_languages[n] = "Chinese";
new_exportvalues[n] = "CN";
new_languages[n + 1] = "Japanese";
new_exportvalues[n + 1] = "JP";
form.SetListOption("choice_3", new_exportvalues, new_languages);
form.SetField("choice_3", "CN");
form.SetField("choice_4", "Japanese");
}
return(ms.ToArray());
}
}
public static byte[] fill_template(byte[] templateFile, List <FormElement> elements)
{
using (MemoryStream output = new MemoryStream())
using (PdfReader pdfReader = new PdfReader(templateFile))
using (PdfStamper stamper = new PdfStamper(pdfReader, output))
{
//without this line of code, farsi fonts would not be visible
stamper.AcroFields.AddSubstitutionFont(GetFont().BaseFont);
AcroFields form = stamper.AcroFields;
form.GenerateAppearances = true;
elements.Where(e => !string.IsNullOrEmpty(e.Name) && form.Fields.ContainsKey(e.Name))
.ToList().ForEach(e =>
{
switch (form.GetFieldType(e.Name))
{
case AcroFields.FIELD_TYPE_TEXT:
case AcroFields.FIELD_TYPE_COMBO:
case AcroFields.FIELD_TYPE_RADIOBUTTON:
form.SetField(e.Name, e.Type == FormElementTypes.Numeric ? e.FloatValue.ToString() : e.TextValue);
break;
case AcroFields.FIELD_TYPE_CHECKBOX:
form.SetField(e.Name, e.BitValue.HasValue && e.BitValue.Value ? "Yes" : "Off");
break;
case AcroFields.FIELD_TYPE_LIST:
form.SetListOption(e.Name,
e.TextValue.Split('~').Select(t => t.Trim()).Where(t => !string.IsNullOrEmpty(t)).ToArray(), null);
form.SetField(e.Name, null);
break;
case AcroFields.FIELD_TYPE_PUSHBUTTON:
break;
case AcroFields.FIELD_TYPE_SIGNATURE:
break;
}
});
//by doing this, the form will not be editable anymore
stamper.FormFlattening = true;
//to make a specific field not editable
//stamper.PartialFormFlattening("[field_name]");
stamper.Close();
pdfReader.Close();
return(output.GetBuffer());
}
}
public static byte[] SetFields(byte[] pdfFile, IFormContentProvider contentProvider)
{
var pr = new PdfReader(pdfFile);
var ims = new MemoryStream();
var ps = new PdfStamper(pr, ims);
AcroFields flds = ps.AcroFields;
foreach (DictionaryEntry entry in flds.Fields)
{
string fieldName = entry.Key.ToString();
var type = (FieldTypes)flds.GetFieldType(fieldName);
switch (type)
{
case FieldTypes.Text:
string value = null;
string display = null;
contentProvider.PopulateTextField(fieldName, out value, out display);
if (value != null)
{
flds.SetField(fieldName, value);
}
break;
case FieldTypes.List:
string[] exportValues = null;
string[] displayValues = null;
string[] selected = null;
contentProvider.PopulateListField(fieldName, out exportValues, out displayValues, out selected);
if (exportValues != null)
{
flds.SetListOption(fieldName, exportValues, displayValues);
}
if (selected != null)
{
flds.SetListSelection(fieldName, selected);
}
break;
default:
break;
}
}
ps.Close();
return(ims.ToArray());
}
