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





In This Topic
GdPicture14 Namespace / GdPicturePDF Class / GetFormFieldItemCount Method

GetFormFieldItemCount Method (GdPicturePDF)

In This Topic
Returns the number of all items included in the required choice form field, hereabout a combo box or a list box, that is specified by its unique form field's identifier and it is related to the currently loaded PDF document. As said, this method is only applicable to combo boxes and list boxes.
Syntax
'Declaration

 

Public Function GetFormFieldItemCount( _

   ByVal FieldId As Integer _

) As Integer
public int GetFormFieldItemCount( 

   int FieldId

)
public function GetFormFieldItemCount( 

    FieldId: Integer

): Integer; 
public function GetFormFieldItemCount( 

   FieldId : int

) : int;
public: int GetFormFieldItemCount( 

   int FieldId

) 
public:

int GetFormFieldItemCount( 

   int FieldId

) 

Parameters

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

Return Value

The number of items included in the required form field. 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.

Just to remind you, that this method is only meaningful for choice form fields, that means for combo boxes and list boxes, otherwise it will fail.

Example
How to find out the total number of items in the combo box field.
Dim caption As String = "Example: GetFormFieldItemCount"

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 formID As Integer = 0

        Dim type As PdfFormFieldType = PdfFormFieldType.PdfFormFieldTypeUnknown

        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.PdfFormFieldTypeCombo Then

                        Dim itemsCount As Integer = gdpicturePDF.GetFormFieldItemCount(formID)

                        If gdpicturePDF.GetStat() = GdPictureStatus.OK Then

                            If itemsCount > 0 Then

                                If gdpicturePDF.DeleteFormFieldItem(formID, 0) = GdPictureStatus.OK Then

                                    Dim message As String = "The item has been successfully deleted." + vbCrLf

                                    If gdpicturePDF.AddFormFieldItem(formID, "Zucchini") = GdPictureStatus.OK Then

                                        message = message + "The new item has been successfully added." + vbCrLf

                                        If gdpicturePDF.SaveToFile("forms_updated.pdf") = GdPictureStatus.OK Then

                                            message = message + "The file has been saved."

                                        Else

                                            message = message + "The file can't be saved. Status: " + gdpicturePDF.GetStat().ToString()

                                        End If

                                    Else

                                        message = "The AddFormFieldItem() method has failed with the status: " + gdpicturePDF.GetStat().ToString()

                                    End If

                                    MessageBox.Show(message, caption)

                                    Exit For

                                Else

                                    MessageBox.Show("The DeleteFormFieldItem() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption)

                                    Exit For

                                End If

                            Else

                                MessageBox.Show("The first combo box includes no items.", caption)

                                Exit For

                            End If

                        Else

                            MessageBox.Show("The GetFormFieldItemCount() 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 count = 0 Then MessageBox.Show("This document includes no form fields.", 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. Status: " + gdpicturePDF.GetStat().ToString(), caption)

End If

gdpicturePDF.Dispose()
string caption = "Example: GetFormFieldItemCount";

GdPicturePDF gdpicturePDF = new GdPicturePDF();

if (gdpicturePDF.LoadFromFile("forms.pdf", false) == GdPictureStatus.OK)

{

    int count = gdpicturePDF.GetFormFieldsCount();

    if (gdpicturePDF.GetStat() == GdPictureStatus.OK)

    {

        int formID = 0;

        PdfFormFieldType type = PdfFormFieldType.PdfFormFieldTypeUnknown;

        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.PdfFormFieldTypeCombo)

                    {

                        int itemsCount = gdpicturePDF.GetFormFieldItemCount(formID);

                        if (gdpicturePDF.GetStat() == GdPictureStatus.OK)

                        {

                            if (itemsCount > 0)

                            {

                                if (gdpicturePDF.DeleteFormFieldItem(formID, 0) == GdPictureStatus.OK)

                                {

                                    string message = "The item has been successfully deleted.\n";

                                    if (gdpicturePDF.AddFormFieldItem(formID, "Zucchini") == GdPictureStatus.OK)

                                    {

                                        message = message + "The new item has been successfully added.\n";

                                        if (gdpicturePDF.SaveToFile("forms_updated.pdf") == GdPictureStatus.OK)

                                            message = message + "The file has been saved.";

                                        else

                                            message = message + "The file can't be saved. Status: " + gdpicturePDF.GetStat().ToString();

                                    }

                                    else

                                    {

                                        message = "The AddFormFieldItem() method has failed with the status: " + gdpicturePDF.GetStat().ToString();

                                    }

                                    MessageBox.Show(message, caption);

                                    break;

                                }

                                else

                                {

                                    MessageBox.Show("The DeleteFormFieldItem() method has failed with the status: " + gdpicturePDF.GetStat().ToString(), caption);

                                    break;

                                }

                            }

                            else

                            {

                                MessageBox.Show("The first combo box includes no items.", caption);

                                break;

                            }

                        }

                        else

                        {

                            MessageBox.Show("The GetFormFieldItemCount() 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 (count == 0)

            MessageBox.Show("This document includes no form fields.", 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. Status: " + gdpicturePDF.GetStat().ToString(), caption);

gdpicturePDF.Dispose();
See Also