A way to find out whether a pdf file is image based

[charuvas1]

Hi,

Is there a way to find out whether a pdf file is image based or not? i.e. whether this pdf file has image or text data?

Thank you
charu

[Loïc]

Hi,

here an idea:

- Open the PDF
- Extract text
- Get Image count

If Image count = 1 and text is empty you have lot of chance to have "image based" PDF.

Kind regards,

Loïc

[charuvas1]

Hi,

As you said I use your functions to know file is image base or not. But it gives me execption if PDF file is a fallible form. It throw exception.
Exception message:
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.


My code is as below:

Code: Select all

Dim oGdPictureImaging As New GdPicture.GdPictureImaging
 oGdPictureImaging.SetLicenseNumber("xxxxx")

 Dim PdfID As Integer = oGdPictureImaging.PdfReaderLoadFromFile(InputFilePath)
       If PdfID > 0 Then
                Dim imgCount As Integer = oGdPictureImaging.PdfReaderGetImageCount(PdfID)
                Dim fleText As String = oGdPictureImaging.PdfReaderGetPageText(PdfID)

                If imgCount >= 1 And fleText = "" Then
                    MsgBox("file is image base")
                Else
                    MsgBox("file is text base")
                End If
     End If
oGdPictureImaging.ReleaseGdPictureImage(PdfID)

[Loïc]

Hi,

You have first to select a page.

Please, make a call to PdfReaderSelectPage before using PdfReaderGetImageCount.

Kind regards,

Loïc

[charuvas1]

Hi,

As you said i call oGdPictureImaging.PdfReaderSelectPage(PdfID, 1) 'Select Page1
before PdfReaderGetImageCount. But I get an exception which i explain earlier.
It occurs only in fallible form PDF.

[Loïc]

Hi,

Please attach PDF which cause this error for investigation.

Kind regards,

Loïc