I need help - I can help - upgrade to 8 problem with renderpagetostring

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upgrade to 8 problem with renderpagetostring

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=1985
Printed Date: 30 Jan 26 at 4:12PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: upgrade to 8 problem with renderpagetostring

Posted By: wjbons
Subject: upgrade to 8 problem with renderpagetostring
Date Posted: 04 Oct 11 at 10:46AM

Hi,

I am upgrading from 7.21 to 8.11 and encounter a problem with creating images.

(I use a new license key).

I am using the LoadFromFile to load an existing pdf document.

The document is loaded and contains 192 pages.

Next I want to create an image from page 1 by using:

Dim Output() As Byte = PDF.RenderPageToString(96, 1, 5) 'pngThe output is empty.

The underlying function QuickPDFStringResultLength returns a size of 0???

Dim data As IntPtr = dll.QuickPDFRenderPageToString(instanceID, DPI, Page, Options)Dim size As Integer = dll.QuickPDFStringResultLength(instanceID)

Am I doing something wrong with this new version? Version 7.21 worked fine.

Local develop Situation:

Visual Studio 2010

Windows 7 64 bit.

Replies:

Posted By: wjbons
Date Posted: 04 Oct 11 at 12:11PM

When I change it to ansi, it works?

Is this now a bug, of do i have to check something???

    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

Posted By: AndrewC
Date Posted: 05 Oct 11 at 8:16AM

You are correct. We found this problem and corrected it in the 8.12 beta.

Posted By: wjbons
Date Posted: 12 Oct 11 at 9:11AM

thanks.