I need help - I can help - Exporting / Printing selected layer of pdf file

Exporting / Printing selected layer of pdf file

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=2461
Printed Date: 17 Jun 25 at 10:16AM
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Topic: Exporting / Printing selected layer of pdf file

Posted By: MartinCS
Subject: Exporting / Printing selected layer of pdf file
Date Posted: 27 Nov 12 at 10:07AM

Hi,

is there a possibility to select a certain layer of a pdf file and export / print it with the original page size of the pdf file container programmatically? With other words, I do have a file which contains several layers. I would like to hide all layers except one specific layer and print it using a pdf printer driver.

Thank you for your support!

Cheers,
Martin

Replies:

Posted By: Ingo
Date Posted: 27 Nov 12 at 7:51PM

Hi Martin!

I would first make a copy of the original pdf to have a working file.
On this file i would delete all layers i don't want and then print out
the working file with one remaining layer.
QuickPDF supports this:
http://www.quickpdflibrary.com/help/quickpdf/LayersAndOptionalContentGroups.php
Have a look at DeleteLayer and LayerCount.
Additionally you should read all about contentstreams...

Cheers and welcome here,
Ingo

Posted By: AndrewC
Date Posted: 28 Nov 12 at 3:19AM

Martin,

Layers are called OptionalContentGroup's (OCG's) in technical speak. Quick PDF library has full support for OCG's including functions. Here is some code I just found showing how the functions are used. (I am not sure what the function does though)

http://www.quickpdflibrary.com/help/quickpdf/OptionalContentGroupCount.php - http://www.quickpdflibrary.com/help/quickpdf/OptionalContentGroupCount.php

http://www.quickpdflibrary.com/help/quickpdf/GetOptionalContentGroupID.php - http://www.quickpdflibrary.com/help/quickpdf/GetOptionalContentGroupID.php

http://www.quickpdflibrary.com/help/quickpdf/SetOptionalContentGroupPrintable.php - http://www.quickpdflibrary.com/help/quickpdf/SetOptionalContentGroupPrintable.php
http://www.quickpdflibrary.com/help/quickpdf/GetOptionalContentGroupName.php - http://www.quickpdflibrary.com/help/quickpdf/GetOptionalContentGroupName.php

int ret = QP.LoadFromFile("pdf_with_ocgs.pdf", "");

int numberOfLayer = QP.OptionalContentGroupCount();

int[] layerID = new int[numberOfLayer];

string[] layerName = new string[numberOfLayer];

string layerNameStr;

for(int iLayer=0; iLayer < numberOfLayer; iLayer++)

{

layerID[iLayer] = QP.GetOptionalContentGroupID(1 + iLayer);

layerName[iLayer] = QP.GetOptionalContentGroupName(layerID[iLayer]);

}

for (int iLayer = 0; iLayer < numberOfLayer; iLayer++)

{

//activating and deactivating the layers,

// in order to have only a single one that is activated

for (int iLayerTemp = 0; iLayerTemp < numberOfLayer; iLayerTemp++)

{

QP.SetOptionalContentGroupVisible(layerID[iLayerTemp], iLayer == iLayerTemp ? 1 : 0);

QP.SetOptionalContentGroupPrintable(layerID[iLayerTemp], iLayer == iLayerTemp ? 1 : 0);

}

QP.UseUnsafeContentStreams(1);

ret = QP.RenderPageToFile(100, 1, 7, "out" + iLayer.ToString() + ".tif");

if (ret != 1)

MessageBox.Show("Render failed");

}