GetBookmarkNextID Method (GdPicturePDF)

In This Topic

Returns a unique identifier of the next bookmark item located on the same level as 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 GetBookmarkNextID( _
   ByVal BookmarkID As Integer _
) As Integer

public int GetBookmarkNextID( 
   int BookmarkID
)

public function GetBookmarkNextID( 
    BookmarkID: Integer
): Integer;

public function GetBookmarkNextID( 
   BookmarkID : int
) : int;

public: int GetBookmarkNextID( 
   int BookmarkID
)

public:
int GetBookmarkNextID( 
   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.GetBookmarkPrevID or GdPicturePDF.GetBookmarkParentID.

Return Value

A unique bookmark identifier of the next bookmark item located on the same level as the specified bookmark item. 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. For example, if the specified bookmark item has no other next bookmark items available on the same level in the hierarchy, the value of GdPictureStatus.PropertyNotFound is returned.

Example

Both examples shows you how to find out the next (sibling) bookmark item of a specified bookmark.

This example shows you all bookmark items (displaying their titles), which are located on the same level as the root bookmark.

VB.NET
C#

Dim caption As String = "Example: GetBookmarkNextID"
Dim gdpicturePDF As New GdPicturePDF()
Dim status As GdPictureStatus = gdpicturePDF.LoadFromFile("bookmarks.pdf", False)
If status = GdPictureStatus.OK Then
    Dim rootID As Integer = gdpicturePDF.GetBookmarkRootID()
    status = gdpicturePDF.GetStat()
    If status = GdPictureStatus.OK Then
        Dim siblingID As Integer = gdpicturePDF.GetBookmarkNextID(rootID)
        status = gdpicturePDF.GetStat()
        If status = GdPictureStatus.OK Then
            Dim titles1 As String = gdpicturePDF.GetBookmarkTitle(rootID) + vbCrLf
            Dim prevID As Integer = 0
            While (status = GdPictureStatus.OK) AndAlso (siblingID > 0)
                titles1 = titles1 + gdpicturePDF.GetBookmarkTitle(siblingID) + vbCrLf
                prevID = siblingID
                siblingID = gdpicturePDF.GetBookmarkNextID(siblingID)
                status = gdpicturePDF.GetStat()
            End While
            If (status <> GdPictureStatus.OK) AndAlso (status <> GdPictureStatus.PropertyNotFound) Then
                MessageBox.Show("The GetBookmarkNextID() method has failed with the status: " + status.ToString(), caption)
            End If
            
            Dim titles2 As String = ""
            siblingID = prevID
            If status = GdPictureStatus.PropertyNotFound Then
                'No other bookmark is available on the same level as the root bookmark.
                status = GdPictureStatus.OK
            End If
            While (status = GdPictureStatus.OK) AndAlso (siblingID > 0)
                titles2 = titles2 + gdpicturePDF.GetBookmarkTitle(siblingID) + vbCrLf
                siblingID = gdpicturePDF.GetBookmarkPrevID(siblingID)
                status = gdpicturePDF.GetStat()
            End While
            If (status <> GdPictureStatus.OK) AndAlso (status <> GdPictureStatus.PropertyNotFound) Then
                MessageBox.Show("The GetBookmarkPrevID() method has failed with the status: " + status.ToString(), caption)
            End If
            
            If (status = GdPictureStatus.OK) OrElse (status = GdPictureStatus.PropertyNotFound) Then
                MessageBox.Show("From top to bottom:" + vbCrLf + titles1 + vbCrLf + "From bottom to top:" + vbCrLf + titles2 + vbCrLf + "The example has been successfully followed.", caption)
            Else
                MessageBox.Show("The example has NOT been successfully followed. Status: " + status.ToString())
            End If
        Else
            If status = GdPictureStatus.PropertyNotFound Then
                MessageBox.Show("The root bookmark doesn't contain any sibling bookmarks.", caption)
            Else
                MessageBox.Show("The GetBookmarkNextID() method has failed with the status: " + status.ToString(), caption)
            End If
        End If
    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()

string caption = "Example: GetBookmarkNextID";
GdPicturePDF gdpicturePDF = new GdPicturePDF();
GdPictureStatus status = gdpicturePDF.LoadFromFile("bookmarks.pdf", false);
if (status == GdPictureStatus.OK)
{
    int rootID = gdpicturePDF.GetBookmarkRootID();
    status = gdpicturePDF.GetStat();
    if (status == GdPictureStatus.OK)
    {
        int siblingID = gdpicturePDF.GetBookmarkNextID(rootID);
        status = gdpicturePDF.GetStat();
        if (status == GdPictureStatus.OK)
        {
            string titles1 = gdpicturePDF.GetBookmarkTitle(rootID) + "\n";
            int prevID = 0;
            while ((status == GdPictureStatus.OK) && (siblingID > 0))
            {
                titles1 = titles1 + gdpicturePDF.GetBookmarkTitle(siblingID) + "\n";
                prevID = siblingID;
                siblingID = gdpicturePDF.GetBookmarkNextID(siblingID);
                status = gdpicturePDF.GetStat();
            }
            if ((status != GdPictureStatus.OK) && (status != GdPictureStatus.PropertyNotFound))
                MessageBox.Show("The GetBookmarkNextID() method has failed with the status: " + status.ToString(), caption);
            
            string titles2 = "";
            siblingID = prevID;
            //No other bookmark is available on the same level as the root bookmark.
            if (status == GdPictureStatus.PropertyNotFound)
                status = GdPictureStatus.OK;
            while ((status == GdPictureStatus.OK) && (siblingID > 0))
            {
                titles2 = titles2 + gdpicturePDF.GetBookmarkTitle(siblingID) + "\n";
                siblingID = gdpicturePDF.GetBookmarkPrevID(siblingID);
                status = gdpicturePDF.GetStat();
            }
            if ((status != GdPictureStatus.OK) && (status != GdPictureStatus.PropertyNotFound))
                MessageBox.Show("The GetBookmarkPrevID() method has failed with the status: " + status.ToString(), caption);
            
            if ((status == GdPictureStatus.OK) || (status == GdPictureStatus.PropertyNotFound))
                MessageBox.Show("From top to bottom:\n" + titles1 + "\n" + "From bottom to top:\n" + titles2 + "\nThe example has been successfully followed.", caption);
            else
                MessageBox.Show("The example has NOT been successfully followed. Status: " + status.ToString());
        }
        else
        {
            if (status == GdPictureStatus.PropertyNotFound)
                MessageBox.Show("The root bookmark doesn't contain any sibling bookmarks.", caption);
            else
                MessageBox.Show("The GetBookmarkNextID() method has failed with the status: " + status.ToString(), 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();

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: GetBookmarkNextID"
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 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: GetBookmarkNextID")
            message = ""
        End If
            
        If bookmarkID = 0 Then
            Exit While
        End If
    End While
    Return
End Sub

//The main entry point.
string caption = "Example: GetBookmarkNextID";
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)
    {
        //Please 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: GetBookmarkNextID");
             message = "";
         }
            
         if (bookmarkID == 0)
             break;
     }
     return;
}

Reference

GdPicturePDF Class
GdPicturePDF Members
GetBookmarkCount Method
GetBookmarkRootID Method
GetBookmarkFirstChildID Method
GetBookmarkChildCount Method
GetBookmarkPrevID Method
GetBookmarkParentID Method
NewBookmark Method