IsPageImage() Method

In This Topic

Returns if the currently selected page of the loaded PDF is entirely image-based.

Image-based pages are considered to contain nothing but one fully visible image covering the whole page area. This image must not be in any way rotated and must not contain any other particular drawing operation such as a clipping path.

Be aware that this method does not ignore the hidden text if present. It is the same as what the IsPageImage(false) method does.

Syntax

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

'Declaration
 
Public Overloads Function IsPageImage() As Boolean

public bool IsPageImage()

public function IsPageImage(): Boolean;

public function IsPageImage() : boolean;

public: bool IsPageImage();

public:
bool IsPageImage();

Return Value

true if the currently selected page is entirely image-based as defined above, otherwise false. 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

How to find out if pages in the PDF document are image-based or not.

VB.NET
C#

Dim caption As String = "Example: IsPageImage"
Dim gdpicturePDF As New GdPicturePDF()
Dim status As GdPictureStatus = gdpicturePDF.LoadFromFile("image.pdf", False)
If status = GdPictureStatus.OK Then
    Dim pageCount As Integer = gdpicturePDF.GetPageCount()
    If gdpicturePDF.GetStat() = GdPictureStatus.OK Then
        Dim result As Boolean = False
        For i As Integer = 1 To pageCount
            status = gdpicturePDF.SelectPage(i)
            If status = GdPictureStatus.OK Then
                result = gdpicturePDF.IsPageImage()
                status = gdpicturePDF.GetStat()
                If status = GdPictureStatus.OK Then
                    If result Then
                        MessageBox.Show("The page nr." + i.ToString() + " IS image-based.", caption)
                    Else
                        MessageBox.Show("The page nr." + i.ToString() + " IS NOT image-based.", caption)
                    End If
                Else
                    MessageBox.Show("The IsPageImage() method has failed with the status: " + status.ToString(), caption)
                End If
            Else
                MessageBox.Show("The SelectPage() method has failed with the status: " + status.ToString(), caption)
            End If
        Next
        MessageBox.Show("Finished successfully.", caption)
    Else
        MessageBox.Show("The GetPageCount() 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 = "Example: IsPageImage";
GdPicturePDF gdpicturePDF = new GdPicturePDF();
GdPictureStatus status = gdpicturePDF.LoadFromFile("image.pdf", false);
if (status == GdPictureStatus.OK)
{
    int pageCount = gdpicturePDF.GetPageCount();
    if (gdpicturePDF.GetStat() == GdPictureStatus.OK)
    {
        bool result = false;
        for (int i = 1; i <= pageCount; i++)
        {
            status = gdpicturePDF.SelectPage(i);
            if (status == GdPictureStatus.OK)
            {
                result = gdpicturePDF.IsPageImage();
                status = gdpicturePDF.GetStat();
                if (status == GdPictureStatus.OK)
                {
                    if (result)
                    {
                        MessageBox.Show("The page nr." + i.ToString() + " IS image-based.", caption);
                    }
                    else
                    {
                        MessageBox.Show("The page nr." + i.ToString() + " IS NOT image-based.", caption);
                    }
                }
                else
                {
                    MessageBox.Show("The IsPageImage() method has failed with the status: " + status.ToString(), caption);
                }
            }
            else
            {
                MessageBox.Show("The SelectPage() method has failed with the status: " + status.ToString(), caption);
            }
        }
        MessageBox.Show("Finished successfully.", caption);
    }
    else
    {
        MessageBox.Show("The GetPageCount() 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
Overload List
GetPageCount Method
SelectPage Method
GetPageText Method
PageHasText Method