GetBookmarkChildCount Method (GdPicturePDF)

In This Topic

Returns the number of child bookmark items (all descendants on lower level only) contained within a specified bookmark item in the bookmark's hierarchy of the currently loaded PDF document.

Syntax

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

'Declaration
 
Public Function GetBookmarkChildCount( _
   ByVal BookmarkID As Integer _
) As Integer

public int GetBookmarkChildCount( 
   int BookmarkID
)

public function GetBookmarkChildCount( 
    BookmarkID: Integer
): Integer;

public function GetBookmarkChildCount( 
   BookmarkID : int
) : int;

public: int GetBookmarkChildCount( 
   int BookmarkID
)

public:
int GetBookmarkChildCount( 
   int BookmarkID
)

Parameters

BookmarkID: A unique bookmark identifier specifying a required bookmark object.
You can obtain this identifier using these methods: GdPicturePDF.NewBookmark, GdPicturePDF.GetBookmarkRootID, GdPicturePDF.GetBookmarkFirstChildID, GdPicturePDF.GetBookmarkNextID, GdPicturePDF.GetBookmarkPrevID or GdPicturePDF.GetBookmarkParentID.

Return Value

The number of all child bookmark items contained within the specified bookmark in the bookmark's hierarchy. 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.

Example

This example shows you titles of all bookmark entries in the PDF document organized by the top level (denoted as level 0).

VB.NET
C#

'The main entry point.
Dim caption As String = "Example: GetBookmarkChildCount"
Dim gdpicturePDF As New GdPicturePDF()
Dim status As GdPictureStatus = gdpicturePDF.LoadFromFile("bookmarks.pdf", False)
If status = GdPictureStatus.OK Then
    Dim message As String = ""
    Dim rootID As Integer = gdpicturePDF.GetBookmarkRootID()
    status = gdpicturePDF.GetStat()
    If status = GdPictureStatus.OK Then
        'Please see the sub-method below.
        ParseOutlines(gdpicturePDF, rootID, 0, message)
        MessageBox.Show("The example has been followed successfully.", caption)
    Else
        If status = GdPictureStatus.PropertyNotFound Then
            MessageBox.Show("This PDF document doesn't contain any bookmarks.", caption)
        Else
            MessageBox.Show("The GetBookmarkRootID() method has failed with the status: " + status.ToString(), caption)
        End If
End If
Else
    MessageBox.Show("The file can't be loaded. Status: " + status.ToString(), caption)
End If
gdpicturePDF.Dispose()
            
'The sub-method.
Private Sub ParseOutlines(gdpicturePDF As GdPicturePDF, bookmarkID As Integer, level As Integer, ByRef message As String)
    Dim title As String = ""
    Dim status As GdPictureStatus = GdPictureStatus.OK
    While True
        title = gdpicturePDF.GetBookmarkTitle(bookmarkID)
        status = gdpicturePDF.GetStat()
        If status = GdPictureStatus.OK Then
            message = message + "Title: """ + title + """  Level: " + level.ToString() + vbCrLf
        Else
            message = message + "Title: this error occurs - " + status.ToString() + "    Level: " + level.ToString() + vbCrLf
        End If
            
        'Checking the children.
        Dim childCount As Integer = gdpicturePDF.GetBookmarkChildCount(bookmarkID)
        status = gdpicturePDF.GetStat()
        If status <> GdPictureStatus.OK Then
            message = message + "This error occurs in GetBookmarkChildCount(): status = " + status.ToString() + vbCrLf
        End If
        If childCount > 0 Then
            Dim childID As Integer = gdpicturePDF.GetBookmarkFirstChildID(bookmarkID)
            status = gdpicturePDF.GetStat()
            If status <> GdPictureStatus.OK Then
                message = message + "This error occurs in GetBookmarkFirstChildID(): status = " + status.ToString() + vbCrLf
            Else
                ParseOutlines(gdpicturePDF, childID, level + 1, message)
            End If
        End If
        'Checking for subsequent bookmarks if the current bookmark has no children.
        bookmarkID = gdpicturePDF.GetBookmarkNextID(bookmarkID)
        status = gdpicturePDF.GetStat()
        If (status <> GdPictureStatus.OK) AndAlso (status <> GdPictureStatus.PropertyNotFound) Then
            message = message + "This error occurs in GetBookmarkNextID(): status = " + status.ToString() + vbCrLf
        End If
            
        If level = 0 Then
            MessageBox.Show(message, "Example: GetBookmarkChildCount")
            message = ""
        End If
            
        If bookmarkID = 0 Then
            Exit While
        End If
    End While
    Return
End Sub

//The main entry point.
string caption = "Example: GetBookmarkChildCount";
GdPicturePDF gdpicturePDF = new GdPicturePDF();
GdPictureStatus status = gdpicturePDF.LoadFromFile("bookmarks.pdf", false);
if (status == GdPictureStatus.OK)
{
    string message = "";
    int rootID = gdpicturePDF.GetBookmarkRootID();
    status = gdpicturePDF.GetStat();
    if (status == GdPictureStatus.OK)
    {
        //Pleae see the sub-method below.
        ParseOutlines(gdpicturePDF, rootID, 0, ref message);
        MessageBox.Show("The example has been followed successfully.", caption);
    }
    else
    {
        if (status == GdPictureStatus.PropertyNotFound)
            MessageBox.Show("This PDF document doesn't contain any bookmarks.", caption);
        else
            MessageBox.Show("The GetBookmarkRootID() method has failed with the status: " + status.ToString(), caption);
    }
}
else
{
    MessageBox.Show("The file can't be loaded. Status: " + status.ToString(), caption);
}
gdpicturePDF.Dispose();
            
 //The sub-method.
 void ParseOutlines(GdPicturePDF gdpicturePDF, int bookmarkID, int level, ref string message)
 {
     string title = "";
     GdPictureStatus status = GdPictureStatus.OK;
     while (true)
     {
         title = gdpicturePDF.GetBookmarkTitle(bookmarkID);
         status = gdpicturePDF.GetStat();
         if (status == GdPictureStatus.OK)
             message = message + "Title: \"" + title + "\"  Level: " + level.ToString() + "\n";
         else
             message = message + "Title: this error occurs - " + status.ToString() + "    Level: " + level.ToString() + "\n";
            
         //Checking children.
         int childCount = gdpicturePDF.GetBookmarkChildCount(bookmarkID);
         status = gdpicturePDF.GetStat();
         if (status != GdPictureStatus.OK)
             message = message + "This error occurs in GetBookmarkChildCount(): status = " + status.ToString() + "\n";
         if (childCount > 0)
         {
             int childID = gdpicturePDF.GetBookmarkFirstChildID(bookmarkID);
             status = gdpicturePDF.GetStat();
             if (status != GdPictureStatus.OK)
                 message = message + "This error occurs in GetBookmarkFirstChildID(): status = " + status.ToString() + "\n";
             else
             {
                 ParseOutlines(gdpicturePDF, childID, level + 1, ref message);
             }
         }
         //Checking for subsequent bookmarks if the current bookmark has no children.
         bookmarkID = gdpicturePDF.GetBookmarkNextID(bookmarkID);
         status = gdpicturePDF.GetStat();
         if ((status != GdPictureStatus.OK) && (status != GdPictureStatus.PropertyNotFound))
             message = message + "This error occurs in GetBookmarkNextID(): status = " + status.ToString() + "\n";
            
         if (level == 0)
         {
             MessageBox.Show(message, "Example: GetBookmarkChildCount");
             message = "";
         }
            
         if (bookmarkID == 0)
             break;
     }
     return;
}

Reference

GdPicturePDF Class
GdPicturePDF Members
GetBookmarkRootID Method
GetBookmarkFirstChildID Method
GetBookmarkNextID Method
GetBookmarkPrevID Method
GetBookmarkParentID Method
NewBookmark Method