GetOCG Method (GdPicturePDF)

In This Topic

Returns a unique identifier of an optional content group according to the index you have specified. You can use the GetOCGCount method to determine the number of all OCG entries (layers) used in the PDF document.

Syntax

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

'Declaration
 
Public Function GetOCG( _
   ByVal OCGIdx As Integer _
) As Integer

public int GetOCG( 
   int OCGIdx
)

public function GetOCG( 
    OCGIdx: Integer
): Integer;

public function GetOCG( 
   OCGIdx : int
) : int;

public: int GetOCG( 
   int OCGIdx
)

public:
int GetOCG( 
   int OCGIdx
)

Parameters

OCGIdx: The index of the required optional content group. It must be a value from 0 to GetOCGCount-1.

Return Value

The unique identifier of the specified OCG entry. 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 proper layer identifier and some of the corresponding layer's properties.

VB.NET
C#

Dim gdpicturePDF As New GdPicturePDF()
Dim status As GdPictureStatus = gdpicturePDF.LoadFromFile("test.pdf", False)
If status = GdPictureStatus.OK Then
    Dim output As String = ""
    Dim ocgCount As Integer = gdpicturePDF.GetOCGCount()
    status = gdpicturePDF.GetStat()
    If status = GdPictureStatus.OK Then
        output = "The number of OCG layers: " + ocgCount.ToString()
        Dim OcgId As Integer = 0
        Dim title As String = ""
        Dim state As PdfOcgState = PdfOcgState.Undefined
        Dim onOff As Boolean = False
        For i As Integer = 0 To ocgCount - 1
            output = output + vbCrLf + "Nr." + (i + 1).ToString() + ": "
            OcgId = gdpicturePDF.GetOCG(i)
            status = gdpicturePDF.GetStat()
            If status = GdPictureStatus.OK Then
                title = gdpicturePDF.GetOCGTitle(OcgId)
                status = gdpicturePDF.GetStat()
                If status = GdPictureStatus.OK Then
                    output = output + "Title = " + title.ToString()
                Else
                    output = output + "Title = Error (" + status.ToString() + ")"
                End If
            
                state = gdpicturePDF.GetOCGViewState(OcgId)
                status = gdpicturePDF.GetStat()
                If status = GdPictureStatus.OK Then
                    output = output + " ; View = " + state.ToString()
                Else
                    output = output + " ; View = Error (" + status.ToString() + ")"
                End If
            
                state = gdpicturePDF.GetOCGExportState(OcgId)
                status = gdpicturePDF.GetStat()
                If status = GdPictureStatus.OK Then
                    output = output + " ; Export = " + state.ToString()
                Else
                    output = output + " ; Export = Error (" + status.ToString() + ")"
                End If
            
                state = gdpicturePDF.GetOCGPrintState(OcgId)
                status = gdpicturePDF.GetStat()
                If status = GdPictureStatus.OK Then
                    output = output + " ; Print = " + state.ToString()
                Else
                    output = output + " ; Print = Error (" + status.ToString() + ")"
                End If
            
                onOff = gdpicturePDF.GetOCGLockedState(OcgId)
                status = gdpicturePDF.GetStat()
                If status = GdPictureStatus.OK Then
                    output = output + " ; Locked = " + onOff.ToString()
                Else
                    output = output + " ; Locked = Error (" + status.ToString() + ")"
                End If
            Else
                output = output + "The GetOCG() method has failed with the status: " + status.ToString()
            End If
        Next
        MessageBox.Show(output, "Example: GetOCG")
    Else
        MessageBox.Show("The GetOCGCount() method has failed with the status: " + status.ToString(), "Example: GetOCG")
    End If
Else
    MessageBox.Show("The file can't be loaded.", "Example: GetOCG")
End If
gdpicturePDF.Dispose()

GdPicturePDF gdpicturePDF = new GdPicturePDF();
GdPictureStatus status = gdpicturePDF.LoadFromFile("test.pdf", false);
if (status == GdPictureStatus.OK)
{
    string output = "";
    int ocgCount = gdpicturePDF.GetOCGCount();
    status = gdpicturePDF.GetStat();
    if (status == GdPictureStatus.OK)
    {
        output = "The number of OCG layers: " + ocgCount.ToString();
        int OcgId = 0;
        string title = "";
        PdfOcgState state = PdfOcgState.Undefined;
        bool onOff = false;
        for (int i = 0; i < ocgCount; i++)
        {
            output = output + "\nNr." + (i + 1).ToString() + ": ";
            OcgId = gdpicturePDF.GetOCG(i);
            status = gdpicturePDF.GetStat();
            if (status == GdPictureStatus.OK)
            {
                title = gdpicturePDF.GetOCGTitle(OcgId);
                status = gdpicturePDF.GetStat();
                if (status == GdPictureStatus.OK)
                    output = output + "Title = " + title.ToString();
                else
                    output = output + "Title = Error (" + status.ToString() + ")";
            
                state = gdpicturePDF.GetOCGViewState(OcgId);
                status = gdpicturePDF.GetStat();
                if (status == GdPictureStatus.OK)
                    output = output + " ; View = " + state.ToString();
                else
                    output = output + " ; View = Error (" + status.ToString() + ")";
            
                state = gdpicturePDF.GetOCGExportState(OcgId);
                status = gdpicturePDF.GetStat();
                if (status == GdPictureStatus.OK)
                    output = output + " ; Export = " + state.ToString();
                else
                    output = output + " ; Export = Error (" + status.ToString() + ")";
            
                state = gdpicturePDF.GetOCGPrintState(OcgId);
                status = gdpicturePDF.GetStat();
                if (status == GdPictureStatus.OK)
                    output = output + " ; Print = " + state.ToString();
                else
                    output = output + " ; Print = Error (" + status.ToString() + ")";
            
                onOff = gdpicturePDF.GetOCGLockedState(OcgId);
                status = gdpicturePDF.GetStat();
                if (status == GdPictureStatus.OK)
                    output = output + " ; Locked = " + onOff.ToString();
                else
                    output = output + " ; Locked = Error (" + status.ToString() + ")";
            }
            else
                output = output + "The GetOCG() method has failed with the status: " + status.ToString();
        }
        MessageBox.Show(output, "Example: GetOCG");
    }
    else
    {
        MessageBox.Show("The GetOCGCount() method has failed with the status: " + status.ToString(), "Example: GetOCG");
    }
}
else
{
    MessageBox.Show("The file can't be loaded.", "Example: GetOCG");
}
gdpicturePDF.Dispose();

Reference

GdPicturePDF Class
GdPicturePDF Members
GetOCGCount Method
GetOCGTitle Method
GetOCGExportState Method
GetOCGLockedState Method
GetOCGPrintState Method
GetOCGViewState Method
GetOCGIntentView Method