DLL Error while trying to generate an image

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Sometimes I get an error while trying to generate a image from a loaded pdf document

ERROR:
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Error occures at the line which is bold.
I use the 8.11 version (.Net)

Anybody an idea what could be wrong with this??

    Public Function RenderPageToString(ByVal DPI As Integer, ByVal Page As Integer, _
        ByVal Options As Integer) As Byte()
      If (dll Is Nothing) Then
        Return New Byte(-1) {}
      Else
        Dim data As IntPtr = dll.QuickPDFRenderPageToString(instanceID, DPI, Page, Options)
        Dim size As Integer = dll.QuickPDFAnsiStringResultLength(instanceID)
        Dim result As Byte() = New Byte(size - 1) {}
        Marshal.Copy(data, result, 0, size)
        Return result
      End If
    End Function

Edited by wjbons - 12 Oct 11 at 9:11AM

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wjbons Members Profile Find Members Posts Beginner Joined: 17 Jun 10 Status: Offline Points: 17	Post Options Post Reply Quote wjbons Report Post Thanks(0) Quote Reply Topic: DLL Error while trying to generate an image Posted: 12 Oct 11 at 9:10AM
	Sometimes I get an error while trying to generate a image from a loaded pdf document ERROR: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. Error occures at the line which is bold. I use the 8.11 version (.Net) Anybody an idea what could be wrong with this?? Public Function RenderPageToString(ByVal DPI As Integer, ByVal Page As Integer, _ ByVal Options As Integer) As Byte() If (dll Is Nothing) Then Return New Byte(-1) {} Else Dim data As IntPtr = dll.QuickPDFRenderPageToString(instanceID, DPI, Page, Options) Dim size As Integer = dll.QuickPDFAnsiStringResultLength(instanceID) Dim result As Byte() = New Byte(size - 1) {} Marshal.Copy(data, result, 0, size) Return result End If End Function Edited by wjbons - 12 Oct 11 at 9:11AM

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 13 Oct 11 at 2:27PM
	This is most likely related to the particular PDF file you are trying to render. Can you please open a support case via http://www.quickpdflibrary.com/support/support-query.php and send us the PDF file in question.

wjbons Members Profile Find Members Posts Beginner Joined: 17 Jun 10 Status: Offline Points: 17	Post Options Post Reply Quote wjbons Report Post Thanks(0) Quote Reply Posted: 13 Oct 11 at 3:40PM
	It occured twice until now in 3 days while working (developing and testing). It is possible that there would be 2 asynchrone processes reading a pdf file. Is there a possibility that when loading the dll twice in different threads that they can cause problems? For example when they both are reading the pdf doc at the same time (async)....

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 13 Oct 11 at 7:19PM
	Hi! I've read here in the forum more than once that QuickPDF isn't threadsafe. Don't know if this is still valid for the current version? I think it's not possible for two instances of QuickPDF calling/opening the same pdf-document. Cheers, Ingo