Re: qthandles with octave 3.7.7 cli

[John W. Eaton]

On 10/02/2013 12:32 PM, Werner Koenig wrote:
> Hallo List,
>
> after I have installed octave 3.7.7 and qthandles, i made first
> experience with qthandles.
> It works fine with octave-gui 3.7.7, but now I want to use it in
> octave-cli 3.7.7, but the prompt
> to command graphics_toolkit qt is
>
> error: __init_qt__: QApplication object must exist.
>
> Any hints to use qthandles in octave-cli 3.7.7 ?

You can't really do that.

The point of octave-cli is to have a binary that is not even linked with 
the Qt libraries, so using Qt Handles with octave-cli doesn't make much 
sense to me.

If you mean that you want to use the command line interface for Octave 
instead of the GUI and still display graphics with QtHandles, then you 
can't really do that yet because, as Octave is telling you, a 
QApplication object must exist to use the Qt widgets and we don't 
currently create one when starting Octave without the GUI, even when it 
is the octave binary that is linked with the Qt widgets.  That can 
probably be fixed, but it hasn't been done yet.  If you want to look at 
what might be needed, then look at the wrapper program that is included 
with QtHandles and think about how that might be integrated with 
Octave's main program that is linked with Qt.

jwe