Re: java package - aa= javaObject('java.lang.Byte',uint8(1));

[PhilipNienhuis]

scotth2o wrote
> Hello,
> 
> I'm trying to make octave communicate with a java API used for ssh/sftp
> etc ... I'm using java 1.2.9 & octave 3.4.3 on (old) fedora linux. The
> java method requires the following:
> 
>  byte[] readMatlab(ch.ethz.ssh2.SFTPv3FileHandle, long, byte[], int, int) 
> 
> The following syntax works in matlab:
> 
>     >> out=h.readMatlab(fid.filehandel,...
>                                     uint32(fid.fileoffset), ...
>                                     uint8(zeros(1,nsz)), ...
>                                     uint16(0), ...
>                                     uint16(nsz))
> 
> I've tried several variations of the matlab syntax above and I think the
> best guess at something that should work in octave is below. 
> 
>             >>        iout=javaArray('java.lang.Byte',nsz); 
>             >>        iout=java_invoke(h,'readMatlab', ...
>                                fid.filehandel,...
>                                java_new('java.lang.Long',fid.fileoffset),
> ...
>                                javaArray('java.lang.Byte',nsz), ...
>                                java_new('java.lang.Integer',0), ...
>                                java_new('java.lang.Integer',nsz));
> 
> Unfortunately it doesn't work & I'm wondering where to look for additional
> debug information. My guess is the java byte array is what is screwing
> things up  & I think it all boils down to the following line which I can't
> make run.
> 
>   >> aa= javaObject('java.lang.Byte',uint8(1));
> 
> Any advice is appreciated.  Thanks in advance & best regards

Sorry, I forgot to mention that there's another, quicker fix:


octave-3.6.4-rc1:3> cc = javaObject ("java.lang.Short", 1).byteValue
cc =

<Java object: java.lang.Byte>


I've often use this trick for creating Java classes that looked unreachable,
but it doesn't always work.

After peeking in ClassHelper.java and the Java on-line rt docs it doesn't
seem to be so easy as I figured, first of all I have to find out if Byte is
a numeric or character class.
If the above trick works for you, I think we'd better leave this issue alone
for now.

Philip




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