Hi.
If you need to detect J on windows using .NET code, I usually do it this way,
1. Create an instance of J and try to send or execute any command there.
2. Enclose the code in a try ... catch and handle the error.
The following example code does exactly that. I have a wrapper class called
J.Session() which is a .NET wrapper to J.EXE, if any of the methods fail, it
would assume that J is in the current directory and try to register it. You can
use any other method of finding out where J is though.
Try
'What we do is we try to make an instance of jSession and close it
immediately
jSession = New J.Session(False)
'Execute a magic number
jSession.variable("WIFE", "Vilma")
jSession.eval("temp=. i. 42")
'If we got here, J is properly installed
jSession.Dispose()
Catch ex As Exception
'Were here so that means J is not properly installed
returnValue = False
If (register) Then
'We start by getting the application path
appPath =
System.Reflection.Assembly.GetExecutingAssembly.Location
appPath = System.IO.Path.GetDirectoryName(appPath)
'We now register the library
Shell(appPath + "\j.exe /regserver", AppWinStyle.NormalNoFocus,
True, -1)
End If
End Try
For more info on the J.NET wrapper class, go to:
http://www.jsoftware.com/jwiki/Guides/J%20VB.NET
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Jack Andrews
Sent: Tuesday, July 07, 2009 9:38 AM
To: Programming forum
Subject: Re: [Jprogramming] detecting j on windows
>> > dir "%APPDATA%\Microsoft\Windows\Start Menu\Programs\j*"
>
> I guess you already got a solution. What's wrong with it? Or you
> prefer the J installer to add that to %PATH% automatically?
nothing wrong with it. i just posted that solution for the benefit
of future readers of this thread.
while on the topic of %PATH%, it seems the equivalent of unix's
/usr/bin is c:\windows\system32. i've been considering using
the system32 dir as an install location in the way unix dumps
binaries in /usr/bin. no problems with %PATH% then :)
examples of exe's in system32:
calc.exe
ftp.exe
java.exe
notepad.exe
mspaint.exe
ta, jack
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