GetOCGViewState Method (GdPicturePDF)

In This Topic

Returns the value of the View state setting of an optional content group specified by its unique identifier.

The View state indicates the onscreen visibility, that means if the content of this group is viewable.

Syntax

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

'Declaration
 
Public Function GetOCGViewState( _
   ByVal OCGId As Integer _
) As PdfOcgState

public PdfOcgState GetOCGViewState( 
   int OCGId
)

public function GetOCGViewState( 
    OCGId: Integer
): PdfOcgState;

public function GetOCGViewState( 
   OCGId : int
) : PdfOcgState;

public: PdfOcgState GetOCGViewState( 
   int OCGId
)

public:
PdfOcgState GetOCGViewState( 
   int OCGId
)

Parameters

OCGId: The unique identifier of the required OCG entry. You can obtain this identifier using the GetOCG method.

Return Value

A member of the PdfOcgState enumeration. The value of the View state setting. 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 View state of the specified layer and some other 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: GetOCGViewState")
    Else
        MessageBox.Show("The GetOCGCount() method has failed with the status: " + status.ToString(), "Example: GetOCGViewState")
    End If
Else
    MessageBox.Show("The file can't be loaded.", "Example: GetOCGViewState")
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: GetOCGViewState");
    }
    else
    {
        MessageBox.Show("The GetOCGCount() method has failed with the status: " + status.ToString(), "Example: GetOCGViewState");
    }
}
else
{
    MessageBox.Show("The file can't be loaded.", "Example: GetOCGViewState");
}
gdpicturePDF.Dispose();

Reference

GdPicturePDF Class
GdPicturePDF Members
GetOCGCount Method
GetOCG Method
GetOCGTitle Method
GetOCGExportState Method
GetOCGIntentView Method
GetOCGLockedState Method
GetOCGPrintState Method
NewOCG Method