RemoveSignature Method (GdPicturePDF)

In This Topic

Removes a digital signature specified by its index from the currently loaded PDF document.

Syntax

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

'Declaration
 
Public Function RemoveSignature( _
   ByVal SignatureIdx As Integer _
) As GdPictureStatus

public GdPictureStatus RemoveSignature( 
   int SignatureIdx
)

public function RemoveSignature( 
    SignatureIdx: Integer
): GdPictureStatus;

public function RemoveSignature( 
   SignatureIdx : int
) : GdPictureStatus;

public: GdPictureStatus RemoveSignature( 
   int SignatureIdx
)

public:
GdPictureStatus RemoveSignature( 
   int SignatureIdx
)

Parameters

SignatureIdx: The 0-based signature index within the current document. It must be a value from 0 to GdPicturePDF.GetSignatureCount-1.

Return Value

A member of the GdPictureStatus enumeration. If the method has been successfully followed, then the return value is GdPictureStatus.OK.

We strongly recommend always checking this status first.

Remarks

This method is only allowed for use with non-encrypted documents.

This method requires the Digital Signatures component to run.

Example

How to remove the specified digital signature from the current document.

VB.NET
C#

Dim caption As String = "RemoveSignature"
Dim gdpicturePDF As New GdPicturePDF()
Dim status As GdPictureStatus = gdpicturePDF.LoadFromFile("test.pdf", False)
If status = GdPictureStatus.OK Then
    Dim signatureCount As Integer = gdpicturePDF.GetSignatureCount()
    status = gdpicturePDF.GetStat()
    If status = GdPictureStatus.OK Then
        If signatureCount > 0 Then
            status = gdpicturePDF.RemoveSignature(signatureCount - 1)
            If status = GdPictureStatus.OK Then
                status = gdpicturePDF.SaveToFile("test_RemoveSignature.pdf")
                If status = GdPictureStatus.OK Then
                    MessageBox.Show("The signature has been removed successfully and the file has been saved.", caption)
                Else
                    MessageBox.Show("The signature has been removed successfully, but the file can't be saved. Status: " + status.ToString(), caption)
                End If
            Else
                MessageBox.Show("The RemoveSignature() method has failed with the status: " + status.ToString(), caption)
            End If
        Else
            MessageBox.Show("This PDF document doesn't contain any digital signature.", caption)
        End If
    Else
        MessageBox.Show("The GetSignatureCount() method has failed with the status: " + status.ToString(), caption)
    End If
Else
    MessageBox.Show("The file can't be loaded.", caption)
End If
gdpicturePDF.Dispose()

string caption = "RemoveSignature";
GdPicturePDF gdpicturePDF = new GdPicturePDF();
GdPictureStatus status = gdpicturePDF.LoadFromFile("test.pdf", false);
if (status == GdPictureStatus.OK)
{
    int signatureCount = gdpicturePDF.GetSignatureCount();
    status = gdpicturePDF.GetStat();
    if (status == GdPictureStatus.OK)
    {
        if (signatureCount > 0)
        {
            status = gdpicturePDF.RemoveSignature(signatureCount - 1);
            if (status == GdPictureStatus.OK)
            {
                status = gdpicturePDF.SaveToFile("test_RemoveSignature.pdf");
                if (status == GdPictureStatus.OK)
                    MessageBox.Show("The signature has been removed successfully and the file has been saved.", caption);
                else
                    MessageBox.Show("The signature has been removed successfully, but the file can't be saved. Status: " + status.ToString(), caption);
            }
            else
                MessageBox.Show("The RemoveSignature() method has failed with the status: " + status.ToString(), caption);
        }
        else
            MessageBox.Show("This PDF document doesn't contain any digital signature.", caption);
    }
    else
        MessageBox.Show("The GetSignatureCount() method has failed with the status: " + status.ToString(), caption);
}
else
    MessageBox.Show("The file can't be loaded.", caption);
gdpicturePDF.Dispose();

Reference

GdPicturePDF Class
GdPicturePDF Members
GetSignatureCount Method