GetFormFieldType Method (GdPicturePDF)

In This Topic

Returns the type of a required form field, that is specified by its unique form field's identifier and it is related to the currently loaded PDF document.

PDF Reference (see Section "Interactive Forms") defines these field types: Button Fields - these are push buttons, check boxes and radio buttons, Text Fields, Choice Fields - these are combo boxes and list boxes, and Signature Fields.

Syntax

Visual Basic
C#
Delphi
JScript
Managed Extensions for C++
C++/CLI

'Declaration
 
Public Function GetFormFieldType( _
   ByVal FieldId As Integer _
) As PdfFormFieldType

public PdfFormFieldType GetFormFieldType( 
   int FieldId
)

public function GetFormFieldType( 
    FieldId: Integer
): PdfFormFieldType;

public function GetFormFieldType( 
   FieldId : int
) : PdfFormFieldType;

public: PdfFormFieldType GetFormFieldType( 
   int FieldId
)

public:
PdfFormFieldType GetFormFieldType( 
   int FieldId
)

Parameters

FieldId: A unique form field identifier specifying a required form field object. You can obtain this identifier using methods like GetFormFieldId, GetFormFieldChildID or methods intended to add form fields.

Return Value

A member of the PdfFormFieldType enumeration. The GetStat method can be subsequently used to determine if this method has been successful.

Remarks

This method is only allowed for use with non-encrypted documents.

It is recommend to use the GetStat method to identify the specific reason for the method's failure, if any.

Example

How to determine types of all used form fields in the document.

VB.NET
C#

Dim caption As String = "Example: GetFormFieldType"
Dim gdpicturePDF As GdPicturePDF = New GdPicturePDF()
If gdpicturePDF.LoadFromFile("test.pdf", False) = GdPictureStatus.OK Then
    Dim count As Integer = gdpicturePDF.GetFormFieldsCount()
    If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
        Dim message As String = "This document contains " + count.ToString() + " form fields." + vbCrLf
        Dim formID As Integer = 0, pagenr As Integer = 0
        Dim name As String = ""
        Dim type As PdfFormFieldType = PdfFormFieldType.PdfFormFieldTypeUnknown
        For i As Integer = 0 To count - 1
            'Getting the form field unique identifier.
            formID = gdpicturePDF.GetFormFieldId(i)
            If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                message = message + (i + 1).ToString() + ". "
                'Getting the form fields' title (name).
                name = gdpicturePDF.GetFormFieldTitle(formID)
                If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                    message = message + name
                Else
                    message = message + gdpicturePDF.GetStat().ToString()
                End If
                'Getting the form field's type.
                message = message + "  type: "
                type = gdpicturePDF.GetFormFieldType(formID)
                If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                    message = message + type.ToString()
                Else
                    message = message + gdpicturePDF.GetStat().ToString()
                End If
                'Getting the form field's page.
                message = message + "  page nr."
                pagenr = gdpicturePDF.GetFormFieldPage(formID)
                If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                    message = message + pagenr.ToString()
                Else
                    message = message + gdpicturePDF.GetStat().ToString()
                End If
                message += vbCrLf
            Else
                message = message + "The GetFormFieldId() method has failed with the status: " + gdpicturePDF.GetStat().ToString()
                Exit For
            End If
        Next
        MessageBox.Show(message, caption)
    Else
        MessageBox.Show("The GetFormFieldsCount() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
    End If
Else
    MessageBox.Show("The file can't be loaded.", caption)
End If
gdpicturePDF.Dispose()

string caption = "Example: GetFormFieldType";
GdPicturePDF gdpicturePDF = new GdPicturePDF();
if (gdpicturePDF.LoadFromFile("test.pdf", false) == GdPictureStatus.OK)
{
    int count = gdpicturePDF.GetFormFieldsCount();
    if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
    {
        string message = "This document contains " + count.ToString() + " form fields.\n";
        int formID = 0, pagenr = 0;
        string name = "";
        PdfFormFieldType type = PdfFormFieldType.PdfFormFieldTypeUnknown;
        for (int i = 0; i < count; i++)
        {
            //Getting the form field unique identifier.
            formID = gdpicturePDF.GetFormFieldId(i);
            if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
            {
                message = message + (i + 1).ToString() + ". ";
                //Getting the form fields' title (name).
                name = gdpicturePDF.GetFormFieldTitle(formID);
                if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
                    message = message + name;
                else
                    message = message + gdpicturePDF.GetStat().ToString();
                //Getting the form field's type.
                message = message + "  type: ";
                type = gdpicturePDF.GetFormFieldType(formID);
                if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
                    message = message + type.ToString();
                else
                    message = message + gdpicturePDF.GetStat().ToString();
                //Getting the form field's page.
                message = message + "  page nr.";
                pagenr = gdpicturePDF.GetFormFieldPage(formID);
                if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
                    message = message + pagenr.ToString();
                else
                    message = message + gdpicturePDF.GetStat().ToString();
                message += "\n";
            }
            else
            {
                message = message + "The GetFormFieldId() method has failed with the status: " + gdpicturePDF.GetStat().ToString();
                break;
            }
        }
        MessageBox.Show(message, caption);
    }
    else
        MessageBox.Show("The GetFormFieldsCount() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
}
else
    MessageBox.Show("The file can't be loaded.", caption);
gdpicturePDF.Dispose();

Reference

GdPicturePDF Class
GdPicturePDF Members
GetFormFieldsCount Method
GetFormFieldId Method
GetFormFieldChildID Method
GetFormFieldPage Method
GetFormFieldTitle Method
RemoveFormField Method