Creating thumbnail images using LS2J in LotusScript

View member feedback to this tip.

This tip resolves a problem faced by many developers who code for the Web: how to create thumbnail images in Lotus Domino. Until I came up with this code, I either ended up with a solution that required manual steps or else I had to use an external program.

The code below uses LS2J to create thumbnail images in LotusScript. LotusScript does not natively have any methods for manipulating images, but Java does. LS2J (which is a part of Notes/Domino on the Win32 platform) makes it possible to expose Java functionality to LotusScript.

This tip employs an agent that is called in the WebQuerySave event of a Domino form. The agent, written in LotusScript, checks the document for image files, and if any are found, creates thumbnail files for them and attaches them to the document. You could create an agent for the Notes client that does the same thing. The central part of the agent is the line that calls the method that creates the thumbnail file. This method (thumbnailObject.ThumbnailThis in the code) receives four parameters:

• The filename of the image that is to be used as the source for the thumbnail file.
• The filename that the thumbnail image should have.
• The maximum width of the thumbnail image.
• The maximum height of the thumbnail image.

I have a form that holds a Body-field and an upload control to allow Web users to attach image files. The form has the following in the WebQuerySave event: @Command([ToolsRunMacro]; "SaveWeb")

In the database I have an agent with the following code:

Below is the Java Library that makes it possible to create the thumbnail – when we make the call for thumbnailObject.ThumbnailThis above.

You creat...

Digg This!     StumbleUpon     Del.icio.us

RELATED CONTENT Agent Run or restart Notes/Domino agents via text messages Approve Lotus Notes documents using a BlackBerry mobile device LotusScript agent indexes Lotus Notes/Domino databases Open documents in Lotus Notes from the Web without a UNID Fix and update Lotus Notes documents with limited access Verify scheduled agent status with Domino Extensible Language (DXL) How to export data from a Lotus Notes database to a CSV file Enable or disable scheduled agents without opening the Lotus Notes database design Creating custom views in Lotus Notes databases Editing fields in a Lotus Notes view with Ajax Domino Mimic Lotus Notes Domino application functionality on the Web A single form to view and edit any Lotus Notes document DECS and DCR external data access considerations How to create non-scrolling Lotus Domino view headers on the Web Disabling the 'Submit' button on a form An easier way to update a rich text field Results from Default Notes Search have # of responses in brackets Lotus Notes/Domino veteran offers comprehensive list of app dev tools Notes to XML. . .and back again Fix for modified Form field value is ignored when document is submitted from the Web LotusScript LotusScript agent parses ACL to Microsoft Notepad LotusScript finds the first occurrence of a string from the right Clear Recent Contacts view and prevent repopulation in Lotus Notes 8.x Search Microsoft Active Directory with LotusScript Three steps to trap and handle save conflicts with LotusScript Troubleshoot agents by displaying LotusScript variables online LotusScript sorts lists alphabetically LotusScript code rebuilds corrupted busytime.nsf file Soft-code item names to facilitate LotusScript management LotusScript agent automates selective mail file replication

RELATED RESOURCES 2020software.com, trial software downloads for accounting software, ERP software, CRM software and business software systems Search Bitpipe.com for the latest white papers and business webcasts Whatis.com, the online computer dictionary

e a Java Library in the Designer in Shared code->Script Libraries, click New Java Library, and then remove the few lines of code that you get as a help for getting started, and paste the code below. Save and call the library "ThumbNail".

Jens Bruntt is a senior consultant at Convergens, a Danish company for whom he architects Domino-browser based Internet, intranet and extranet sites. He has been a developer and infrastructure advisor for Notes and Domino projects since 1994 and is an R6 Principal Developer. He is also SearchDomino.com's expert on Web development. Jens gives credit for this tip to Min-Chi Huang, who made sample thumbnailing code available to the openntf.org project, "Open Notes Picture Database."

MEMBER FEEDBACK TO THIS TIP

This is a very useful article. However, be careful about useing doc.save(...) in WebQuerySave-Agent. Nobody knows (not even IBM) what happens. Another problem is the use of "Toolkit.getDefaultToolkit().getImage(inputFilePath);" from the java.awt.* package -- it does not work on Unix/Linux maschines without startet X-Window Server.

—Matthias G.

Do you have comments on this tip? Let us know.

Please let others know how useful this tip is via the rating scale below. Do you have a useful Notes/Domino tip or code to share? Submit it to our monthly tip contest and you could win a prize and a spot in our Hall of Fame.

Rate this Tip To rate tips, you must be a member of SearchDomino.com. Register now to start rating these tips. Log in if you are already a member. Submit a Tip DISCLAIMER: Our Tips Exchange is a forum for you to share technical advice and expertise with your peers and to learn from other enterprise IT professionals. TechTarget provides the infrastructure to facilitate this sharing of information. However, we cannot guarantee the accuracy or validity of the material submitted. You agree that your use of the Ask The Expert services and your reliance on any questions, answers, information or other materials received through this Web site is at your own risk.