Subj : Re: LiveConnect javascript supports java.io.File but not FileReader?
To   : netscape.public.mozilla.jseng
From : Simon Taylor <simontaylor@fastmail.fm>
Date : Mon Jul 21 2003 10:12 am

Hello Brendan,

Thanks so much for your reply.

>> (My attempt to access java.io.FileReader causes the following error
>> in the javascript console: Error: jsdIExecutionHook is not defined)
> 
> 
> That is spurious: it has to do with the JS debugger, Venkman.  You 
> should retry the test after disabling the debugger completely.  See 
> http://www.mozilla.org/projects/venkman/ and please do file a bug at 
> http://bugzilla.mozilla.org/.
> 
> Cc'ing rginda for his advice on how to disable the debugger.

I resorted to doing a custom re-install of Mozilla so that I no longer
have the JS debugger installed. And now that I've done that I'm still 
failing at the same point. That is, I can construct a java.io.File 
object, I can call the getPath() method, but I cannot then construct a 
java.io.FileReader object. I get the error:

Error: uncaught exception: Error while constructing instance of (null)

The relevant snippet of code is below.

Regards,

Simon Taylor

> <SCRIPT LANGUAGE="Javascript">
> function ioTest()
> {
>     try {
>
> netscape.security.PrivilegeManager.enablePrivilege("UniversalFileRead");
>     } catch (err) {
>         document.write('UniversalFileRead denied, error was: ' + err + 
> '<br>');
>     return false;
>     }
>     document.write("2. UniversalFileRead PASSED<BR>");
>     document.write("3. java.io.File...<BR>");
>     var file = new java.io.File("/tmp/file");
>     document.write("  ...OK<br>");
>
>     // test the getPath method
>     document.write("4. getPath...<BR>");
>     document.write("Can we read this file?: " + file.getPath() + "<br>");
>     document.write("  ...OK<br>");
>
>     // FileReader?
>     document.write("5. FileReader?...<br>");
>     var filereader = new java.io.FileReader(file);
>     document.write("  ...OK<br>");
>     document.write("9. ioTest done<BR>");
> }
>
> ioTest();
> </SCRIPT>

.