Creating Thumbnails for use in .NET

[John - Tracker Supp]

Posted on behalf of : Tobias Herold
++++++++++++++++++++++++++++++++++
Hi,

we have been reccomended to use the Simple Viewer SDK to generate an image of a PDF page fo use as a thumbnail and need some help please :

Please have look to the following code snippet:

Dim res As Integer
Dim pointer As IntPtr = GetDC(Handle)
Dim bmp As System.Drawing.Bitmap
res = PXCV_Lib.PXCV_DrawPageToDIBSection(m_Doc, 0, m_Parameters, Nothing, 250, pointer, 0, 0)
bmp = Bitmap.FromHbitmap(pointer)
Me.PictureBox1.Image = bmp

My aim of this code is to get an bitmap from
a pdf page which I can use in .net native controls then.

Is this the only and simplest way to accomplish it? It looks
a bit weird and complicated to me, though it works.

You wrote something about automatically generated thumbnails
when using your ActiveX Viewer for loading the PDF documents.
So how it is possible to access these thumbs for a further
handling in .net controls (e.g. listview)?
Important: I do not need PDF documents with embedded thumbnails
but thumbs for showing them in a listview or datagridview.

Unfortunately your thumbnailview of the viewer doesn't meet all of our requirements (e.g. drag&drop to .net controls, customize thumbnailcolor, positioning...). For this reason we have to implement the thumbnailview
for ourselves.

Thank you for the good contact and your patience.
Tobias Herold

[ebbiTeam]

No idea? Especially the topic about creating of thumbnails is very important for our project.
My example code looks like a roundabout way for me and I'm wondering if there's a much better way.
(e.g. get possibly automatically generated thumbs from your view control)
Hope for an answer today.

Best regards

Tobias Herold
Ebbinghaus TEAM GmbH

[Corwin - Tracker Sup]

Hello Tobias Herold,

There is no way to get existing thumbnails from Viewer ActiveX. PXCV_DrawPageToDIBSection function form Simple Viewer SDK should work for your needs.

[ebbiTeam]

Hello Tobias Herold,

There is no way to get existing thumbnails from Viewer ActiveX. PXCV_DrawPageToDIBSection function form Simple Viewer SDK should work for your needs.

Thus I'm on the right way with my code snippet above?

[Corwin - Tracker Sup]

It will be better to draw direct on needed DC. Please see attached example.

[ebbiTeam]

Thank you very much - that helped a lot!
At the beginning of next week I will try to implement it and then I will give you a feedback about it.

Until then have an nice weekend.

[Stefan - PDF-XChange]

Thanks Tobias,

You too have a lovely weekend!
And we would be expecting that feedback!

Cheers,
Stefan