GetFormFieldValue(Int32) Method

In This Topic

Returns the current value 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. The value's format varies depending on the type of the form field. This method returns the string representation of the field's current value.

Syntax

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

'Declaration
 
Public Overloads Function GetFormFieldValue( _
   ByVal FieldId As Integer _
) As String

public string GetFormFieldValue( 
   int FieldId
)

public function GetFormFieldValue( 
    FieldId: Integer
): String;

public function GetFormFieldValue( 
   FieldId : int
) : String;

public: string* GetFormFieldValue( 
   int FieldId
)

public:
String^ GetFormFieldValue( 
   int FieldId
)

Parameters

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

Return Value

A string representation of the current value of the specified form field. The GdPicturePDF.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 GdPicturePDF.GetStat method to identify the specific reason for the method's failure, if any.

Just to inform you, that for list boxes allowing multiple selections the currently selected items are delimited in the resulting string with the separator set to "," by default. You can use the GdPicturePDF.GetFormFieldValue method to set this separator to your preferred value.

Example

How to determine all used form fields in the document, their types, names and values.

VB.NET
C#

Dim caption As String = "Example: GetFormFieldValue"
Dim gdpicturePDF As GdPicturePDF = New GdPicturePDF()
If gdpicturePDF.LoadFromFile("forms.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
        Dim name As String = "", value As String = ""
        Dim type As PdfFormFieldType = PdfFormFieldType.PdfFormFieldTypeUnknown
        For i As Integer = 0 To count - 1
            formID = gdpicturePDF.GetFormFieldId(i)
            If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                message = message + (i + 1).ToString() + ". "
                '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 fields' title (name).
                message = message + "  title: "
                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 value.
                message = message + "  value: "
                value = gdpicturePDF.GetFormFieldValue(formID)
                If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                    message = message + value
                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: GetFormFieldValue";
GdPicturePDF gdpicturePDF = new GdPicturePDF();
if (gdpicturePDF.LoadFromFile("forms.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;
        string name = "", value = "";
        PdfFormFieldType type = PdfFormFieldType.PdfFormFieldTypeUnknown;
        for (int i = 0; i < count; i++)
        {
            formID = gdpicturePDF.GetFormFieldId(i);
            if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
            {
                message = message + (i + 1).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 fields' title (name).
                message = message + "  title: ";
                name = gdpicturePDF.GetFormFieldTitle(formID);
                if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
                    message = message + name;
                else
                    message = message + gdpicturePDF.GetStat().ToString();
                //Getting the form field's value.
                message = message + "  value: ";
                value = gdpicturePDF.GetFormFieldValue(formID);
                if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
                    message = message + value;
                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
Overload List
SetFormFieldValue(Int32,String) Method
GetFormFieldDefaultValue Method
GetFormFieldsCount Method
GetFormFieldId Method
GetFormFieldChildID Method
GetFormFieldType Method