A unique form field identifier specifying a required form field object. You can obtain this identifier using these methods: AddRadioButtonFormField(Single,Single,Single,Single,String,String,PdfCheckBoxStyle,Byte,Byte,Byte), GetFormFieldId or GetFormFieldChildID.

You can use either the identifier of the required radio button field or its child button as well.

Example





In This Topic
GdPicture14 Namespace / GdPicturePDF Class / ResetFormFieldDefaultCheckedState Method

ResetFormFieldDefaultCheckedState Method (GdPicturePDF)

In This Topic
Resets, in other words completely removes the currently defined default selection of a required form field, here a radio button. That means no child button in a group of radio buttons within a radio button field stays selected by default using this method. The radio button group or the child radio button in this group is specified by its unique form field's identifier and it is related to the currently loaded PDF document. As said, this method is explicitly applicable to radio button form field objects and their child buttons as well.
Syntax
'Declaration
 
Public Function ResetFormFieldDefaultCheckedState( _
   ByVal FieldId As Integer _
) As GdPictureStatus
public GdPictureStatus ResetFormFieldDefaultCheckedState( 
   int FieldId
)
public function ResetFormFieldDefaultCheckedState( 
    FieldId: Integer
): GdPictureStatus; 
public function ResetFormFieldDefaultCheckedState( 
   FieldId : int
) : GdPictureStatus;
public: GdPictureStatus ResetFormFieldDefaultCheckedState( 
   int FieldId
) 
public:
GdPictureStatus ResetFormFieldDefaultCheckedState( 
   int FieldId
) 

Parameters

FieldId
A unique form field identifier specifying a required form field object. You can obtain this identifier using these methods: AddRadioButtonFormField(Single,Single,Single,Single,String,String,PdfCheckBoxStyle,Byte,Byte,Byte), GetFormFieldId or GetFormFieldChildID.

You can use either the identifier of the required radio button field or its child button as well.

Return Value

A member of the GdPictureStatus enumeration. If the method has been successfully followed, then the return value is GdPictureStatus.OK.

We strongly recommend always checking this status first.

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

Just to remind you that this method is only meaningful for radio buttons, both the radio button fields and their children as well, otherwise it will fail.

Example
How to reset all radio buttons in the current document to be not checked by default. All radio buttons are completely unchecked.
Dim caption As String = "Example: ResetFormFieldDefaultCheckedState"
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, childCount As Integer = 0, radioButtons As Integer = 0
        Dim type As PdfFormFieldType = PdfFormFieldType.PdfFormFieldTypeUnknown
        Dim defChecked As Boolean = False, isChanged As Boolean = False
        For i As Integer = 0 To count - 1
            formID = gdpicturePDF.GetFormFieldId(i)
            If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                type = gdpicturePDF.GetFormFieldType(formID)
                If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                    If type = PdfFormFieldType.PdfFormFieldTypeRadioButton Then
                        radioButtons += 1
                        childCount = gdpicturePDF.GetFormFieldChildCount(formID)
                        If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                            For j As Integer = 0 To childCount - 1
                                defChecked = gdpicturePDF.GetFormFieldDefaultChecked(formID, j)
                                If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                                    If defChecked Then
                                        'Removing the current default selection for the given radio button completely.
                                        If gdpicturePDF.ResetFormFieldDefaultCheckedState(formID) = GdPictureStatus.OK Then
                                            message = message + (i + 1).ToString() + ". rb group has been changed successfully." + vbCrLf
                                            isChanged = True
                                            'Removing the current selection for the given radio button completely.
                                            If gdpicturePDF.ResetFormFieldCheckedState(formID) <> GdPictureStatus.OK Then
                                                MessageBox.Show(message + "Something has failed in unchecking buttons with the status: " + gdpicturePDF.GetStat().ToString(), caption)
                                            End If
                                        Else
                                            MessageBox.Show(message + "Something has failed in changing default settings with the status: " + gdpicturePDF.GetStat().ToString(), caption)
                                        End If
                                    'Only one radio button can be checked by default at a time.
                                    Exit For
                                    End If
                                Else
                                    MessageBox.Show(message + " The GetFormFieldDefaultChecked() method failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
                                End If
                            Next
                        Else
                            MessageBox.Show(message + "The GetFormFieldChildCount() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
                            Exit For
                        End If
                    End If
                Else
                    MessageBox.Show("The GetFormFieldType() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
                    Exit For
                End If
            Else
                MessageBox.Show("The GetFormFieldId() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)
                Exit For
            End If
        Next
        If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
            If radioButtons = 0 Then
                message = message + "This document does not contain radio buttons." + vbCrLf
            ElseIf Not isChanged Then
                message = message + "This document has not been changed."
            Else
                If gdpicturePDF.SaveToFile("forms_updated.pdf") = GdPictureStatus.OK Then
                    message = message + "The example has been followed successfully and the file has been saved."
                Else
                    message = message + "The example has been followed successfully, but the file can't be saved. Status: " + gdpicturePDF.GetStat().ToString()
                End If
            End If
            MessageBox.Show(message, caption)
        End If
    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: ResetFormFieldDefaultCheckedState";
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, childCount = 0, radioButtons = 0;
        PdfFormFieldType type = PdfFormFieldType.PdfFormFieldTypeUnknown;
        bool defChecked = false, isChanged = false;
        for (int i = 0; i < count; i++)
        {
            formID = gdpicturePDF.GetFormFieldId(i);
            if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
            {
                type = gdpicturePDF.GetFormFieldType(formID);
                if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
                {
                    if (type == PdfFormFieldType.PdfFormFieldTypeRadioButton)
                    {
                        radioButtons++;
                        childCount = gdpicturePDF.GetFormFieldChildCount(formID);
                        if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
                        {
                            for (int j = 0; j < childCount; j++)
                            {
                                defChecked = gdpicturePDF.GetFormFieldDefaultChecked(formID, j);
                                if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
                                {
                                    if (defChecked)
                                    {
                                        //Removing the current default selection for the given radio button completely.
                                        if (gdpicturePDF.ResetFormFieldDefaultCheckedState(formID) == GdPictureStatus.OK)
                                        {
                                            message = message + (i + 1).ToString() + ". rb group has been changed successfully.\n";
                                            isChanged = true;
                                            //Removing the current selection for the given radio button completely.
                                            if (gdpicturePDF.ResetFormFieldCheckedState(formID) != GdPictureStatus.OK)
                                                MessageBox.Show(message + "Something has failed in unchecking buttons with the status: " + gdpicturePDF.GetStat().ToString(), caption);
                                        }
                                        else
                                            MessageBox.Show(message + "Something has failed in changing default settings with the status: " + gdpicturePDF.GetStat().ToString(), caption);
                                        break; //Only one radio button can be checked by default at a time.
                                    }
                                }
                                else
                                    MessageBox.Show(message + " The GetFormFieldDefaultChecked() method failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
                            }
                        }
                        else
                        {
                            MessageBox.Show(message + "The GetFormFieldChildCount() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
                            break;
                        }
                    }
                }
                else
                {
                    MessageBox.Show("The GetFormFieldType() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
                    break;
                }
            }
            else
            {
                MessageBox.Show("The GetFormFieldId() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);
                break;
            }
        }
        if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
        {
            if (radioButtons == 0) message = message + "This document does not contain radio buttons.\n";
            else if (!isChanged) message = message + "This document has not been changed.";
            else
            {
                if (gdpicturePDF.SaveToFile("forms_updated.pdf") == GdPictureStatus.OK)
                    message = message + "The example has been followed successfully and the file has been saved.";
                else
                    message = message + "The example has been followed successfully, but the file can't be saved. Status: " + gdpicturePDF.GetStat().ToString();
            }
            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();
See Also