GetFormFieldChildCount Method (GdPicturePDF)

In This Topic

Returns the number of the immediate children 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. For further assistance, please refer to the PDF Reference, Section "Interactive Forms".

Syntax

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

'Declaration
 
Public Function GetFormFieldChildCount( _
   ByVal FieldId As Integer _
) As Integer

public int GetFormFieldChildCount( 
   int FieldId
)

public function GetFormFieldChildCount( 
    FieldId: Integer
): Integer;

public function GetFormFieldChildCount( 
   FieldId : int
) : int;

public: int GetFormFieldChildCount( 
   int FieldId
)

public:
int GetFormFieldChildCount( 
   int FieldId
)

Parameters

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

Return Value

The number of the immediate children of the specified parent 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.

Example

How to find out the number of kids and their types of all form fields in the current document.

VB.NET
C#

Dim caption As String = "Example: GetFormFieldChildCount"
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 status As GdPictureStatus = GdPictureStatus.OK
        Dim message As String = ""
        Dim formID As Integer = 0, chCount As Integer = 0, kidsID 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
                message = message + (i + 1).ToString() + ".field's type: "
                type = gdpicturePDF.GetFormFieldType(formID)
                If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                    message = message + type.ToString() + "   number of kids: "
                    chCount = gdpicturePDF.GetFormFieldChildCount(formID)
                    If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                        message = message + chCount.ToString()
                        For j As Integer = 0 To chCount - 1
                            kidsID = gdpicturePDF.GetFormFieldChildID(formID, j)
                            status = gdpicturePDF.GetStat()
                            If status = GdPictureStatus.OK Then
                                message = message + vbCrLf + "   " + (j + 1).ToString() + ".kid's type: "
                                type = gdpicturePDF.GetFormFieldType(kidsID)
                                If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
                                    message = message + type.ToString()
                                Else
                                    message = message + gdpicturePDF.GetStat().ToString()
                                End If
                            Else
                                message = message + vbCrLf + "The GetFormFieldChildID() method has failed with the status: " + status.ToString()
                                Exit For
                            End If
                        Next
                    Else
                        message = message + gdpicturePDF.GetStat().ToString()
                    End If
                Else
                    message = message + gdpicturePDF.GetStat().ToString()
                End If
                message = message + vbCrLf
                If status <> GdPictureStatus.OK Then Exit For
            Else
                message = message + "The GetFormFieldId() method has failed with the status: " + gdpicturePDF.GetStat().ToString()
                Exit For
            End If
        Next
        If count = 0 Then message = "This file doesn't include forms."
        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: GetFormFieldChildCount";
GdPicturePDF gdpicturePDF = new GdPicturePDF();
if (gdpicturePDF.LoadFromFile("forms.pdf", false) == GdPictureStatus.OK)
{
    int count = gdpicturePDF.GetFormFieldsCount();
    if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
    {
        GdPictureStatus status = GdPictureStatus.OK;
        string message = "";
        int formID = 0, chCount = 0, kidsID = 0 ;
        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() + ".field's type: ";
                type = gdpicturePDF.GetFormFieldType(formID);
                if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
                {
                    message = message + type.ToString() + "   number of kids: ";
                    chCount = gdpicturePDF.GetFormFieldChildCount(formID);
                    if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
                    {
                        message = message + chCount.ToString();
                        for (int j = 0; j < chCount; j++)
                        {
                            kidsID = gdpicturePDF.GetFormFieldChildID(formID, j);
                            status = gdpicturePDF.GetStat();
                            if (status == GdPictureStatus.OK)
                            {
                                message = message + "\n   " + (j + 1).ToString() + ".kid's type: ";
                                type = gdpicturePDF.GetFormFieldType(kidsID);
                                if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
                                    message = message + type.ToString();
                                else
                                    message = message + gdpicturePDF.GetStat().ToString();
                            }
                            else
                            {
                                message = message + "\nThe GetFormFieldChildID() method has failed with the status: " + status.ToString();
                                break;
                            }
                        }
                    }
                    else
                        message = message + gdpicturePDF.GetStat().ToString();
                }
                else
                    message = message + gdpicturePDF.GetStat().ToString();
                message = message + "\n";
                if (status != GdPictureStatus.OK)
                    break;
            }
            else
            {
                message = message + "The GetFormFieldId() method has failed with the status: " + gdpicturePDF.GetStat().ToString();
                break;
            }
        }
        if (count == 0) message = "This file doesn't include forms.";
        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
GetFormFieldType Method