externals

[Jiro Harada]

Randall,

> What of rev's own file IO functions and commands?  Wht about  
> listing directories at a path or spidering down file trees?

Java offers the functionalities more than Rev. For more information,  
see the following web page:
http://java.sun.com/j2se/1.5.0/docs/api/index.html
(Click "java.io" in the upper-left frame and then click "File" in the  
lower-left frame.)

> Do they do the right and same thing on every platform?

I have never encountered problems about File IO on Windows and Mac OS.

> My other question is deeper and has to do with listening in to OS  
> level system wide file IO events.

What dose "OS level system wide file IO event" mean concretely?

Jiro Harada


On 2009/01/19, at 14:53, Randall Reetz wrote:

> Thank you Jiro,
>
> What of rev's own file IO functions and commands?  Wht about  
> listing directories at a path or spidering down file trees?  Do  
> they do the right and same thing on every platform?  My other  
> question is deeper and has to do with listening in to OS level  
> system wide file IO events.. And somhow triggering the passing of  
> matching messages to rev. stacks.  Any ideas?
>
> -----Original Message-----
> From: "Jiro Harada" <jiro at ronri-kobo.com>
> To: "How to use Revolution" <use-revolution at lists.runrev.com>
> Sent: 1/18/2009 9:30 PM
> Subject: Re: externals
>
> Randall,
>
> Java provides a lot of methods for File IO, which are abstracted and
> platform-dependent. My external enables them to be used from within  
> Rev.
>
> Java Swing offers a platform-independent file or directory chooser
> dialog. However I have never tested it by using my external. I will
> test it and inform you of the result later. I don't think my external
> can open dialogs created in Java.
>
> Jiro Harada
>
>
>
> On 2009/01/19, at 11:21, Randall Reetz wrote:
>
>> Well, good, thanks, i guess that provides a path to cross pltform
>> external supported code.  Do java machines offer file IO and
>> directory navigation?  How about reaching into file system events
>> as they happen and generating rev messages?
>>
>> -----Original Message-----
>> From: "Jiro Harada" <jiro at ronri-kobo.com>
>> To: "How to use Revolution" <use-revolution at lists.runrev.com>
>> Sent: 1/18/2009 5:42 PM
>> Subject: Re: externals
>>
>> Randall,
>>
>>> In rev, are externals written to a reference VM so that they are
>>> only written once and can run on any platform?  Or, do they have to
>>> be written separately to each platform? Can java programs be called
>>> as externals?
>>>
>>> Randall
>>
>> I have written an external to launch a JVM and call the Java methods
>> on Windows and Mac OS. By the external the Java methods can be called
>> as external commands or functions of Rev on both platforms. The
>> external also enables the Java programs to send messages to Rev's
>> handlers.
>>
>> The demo is downloadable at the following URL:
>> http://www.f-ab.net
>>
>> The demo is created by Runrev 3.0. In the demo, Derby(relational
>> database in written Java), HttpClient(http components written Java),
>> Red5(Flash server written in Java) and Sphinx-4(speech recognizer
>> written in Java) are used.
>>
>> Jiro Harada
>>