J# Browser Controls

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Introduction

This short hands on article will show you how to convert Java Applets written for the Sun JDK 1.1.4 into J# Browser Controls. A J# Browser Control is the equivalent to the Java Applets in the .NET world. Before any clients can view any J# Browser Controls, they must first install these redists in this order:

Client computers

• .NET 1.1 redist package
• J# 1.1 redist package
• J# Browser Controls v1.1b

Developer computers alternative 1

• .NET 1.1 SDK
• J# redist 1.1
• J# Browser Controls v1.1b

Developer computers alternative 2

• Microsoft Visual Studio 2003 Pro / or Microsoft Visual Studio J# 2003 standard edition
• J# Browser Controls v1.1b

(Please notice that the Microsoft Visual Studio .NET/2002 IDE does not support J# Browser Controls).

The latest J# Browser Controls version has support for offline viewing, which is nice for debugging on your local computer. This will allow you to view the web pages locally without running them through a web server.

The converting steps are done very quickly if the source Java Applet is written in the supported JDK 1.1.4 API. Here are the steps:

Compiling

A J# Browser Control consists of a dll library. You can compile the Browser Control from the Java Applet source by doing:

C:\...\>vjc.exe /target:library /out:Applet.dll *.java

Hopefully you did not get any errors, only a Applet.dll library file.

Editing the HTML web page file

You can include a J# Browser Control in nearly any web page by including the following line:

<OBJECT CLASSID="clsid:a399591c-0fd0-41f8-9d25-bd76f632415f" 
 WIDTH=300 HEIGHT=110
 ID=SkidPad
 VJSCODEBASE = "Applet.dll#skidpad" >
</OBJECT>

The CLASSID tag references the ActiveX control that runs the J# Browser Control. Do not edit this ID. If you edit this ID tag the J# Browser Control will not work.

WIDTH and HEIGHT are the size in pixels.

VJSCODEBASE references the URL where the Browser Control is located and which class the applet lives in. "Applet.dll#skidpad" tells us the Applet.dll is located in the same directory as the html-file, and the "applet" is located in the skidpad class.

It does not work!

Please check the following:

• The redists (all three must be installed)
• The supported API (JDK 1.1.4, please notice this is not 1.4.1)
• The CLASSID and the VJSCODEBASE tag in the html page file.

References

• http://msdn.microsoft.com/vjsharp/
• microsoft.public.dotnet.vjsharp

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gray box Aaron Sulwer 10:59 29 Sep '05   i have installed all of the required items that i need to get this to work. i am using your example and all i get is a small gray box, any reason for this? Sign In·View Thread·PermaLink Dumb questin dvemil 22:50 14 Nov '04   Is it possible to use "C# controls" instead of "J# controls" in web page? Sign In·View Thread·PermaLink Re: Dumb questin Judah Himango 10:40 22 Nov '04   Yes but not in the same way. Use your favorite search engine to fine "C# Applet" for several good examples and articles on how to write C# code that runs in a web browser. Any remotely useful information on my blog will be removed immediately. There are 10 kinds of people in the world. Those who have heard of the ubiquitous, overused, worn-out-like-an-old-shoe binary "joke" and those who haven't. Judah Himango Sign In·View Thread·PermaLink Re: Dumb questin dvemil 21:45 22 Nov '04   Thanks Sign In·View Thread·PermaLink

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