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From: Adam on 16 Jun 2010 17:24
Hello,

I'm having trouble using the 'load' function from within a function. This is to be within a GUI callback to load the handles saved from last session. The problem is load doesn't seem to work from within a callback (nothing is added to the workspace). Is there a work around this? What I'm trying to do is allow the user to save what is in some edit boxes, then load a file to automatically fill them again.

Thanks
From: TideMan on 16 Jun 2010 17:29
On Jun 17, 9:24 am, "Adam " <a...(a)ubc.ca> wrote:
> Hello,
>
> I'm having trouble using the 'load' function from within a function. This is to be within a GUI callback to load the handles saved from last session.. The problem is load doesn't seem to work from within a callback (nothing is added to the workspace). Is there a work around this? What I'm trying to do is allow the user to save what is in some edit boxes, then load a file to automatically fill them again.
>
> Thanks

Bunkum, balderdash, poppycock and hooey.
Of course it works inside a function.
Look for a bug in your code, not a problem with the load function.
From: Walter Roberson on 16 Jun 2010 17:41
Adam wrote:
> Hello,
>
> I'm having trouble using the 'load' function from within a function.
> This is to be within a GUI callback to load the handles saved from last
> session. The problem is load doesn't seem to work from within a callback
> (nothing is added to the workspace). Is there a work around this? What

When you use load within a function (any function, including a callback), the
variables are added to the workspace for _that_ function. There isn't just
*one* workspace: every function has its own workspace.

As this is happening within a callback, the routine that created the control
and callback may well not be running anymore, so you cannot use assignin()
From: Steven Lord on 16 Jun 2010 17:44

"Adam " <abc5(a)ubc.ca> wrote in message
news:hvbfdk$7dl$1(a)fred.mathworks.com...
> Hello,
>
> I'm having trouble using the 'load' function from within a function. This
> is to be within a GUI callback to load the handles saved from last
> session. The problem is load doesn't seem to work from within a callback
> (nothing is added to the workspace).

It works ... but it doesn't add the variables to the _base_ workspace but to
the workspace of the _callback function_ in which you called LOAD.

But be very careful when you load the handles structure from a previous run
.... the objects inside the GUI may not (will likely not) have the same
handle values as before, so I would only use this if I were trying to
retrieve data stored in the handles structure, not the handles themselves.

> Is there a work around this? What I'm trying to do is allow the user to
> save what is in some edit boxes, then load a file to automatically fill
> them again.

Specify an output argument [which I'll call data] when you call LOAD, then
refer to data.handles.<the name of the data you want to use> in the
callback. This ensures you don't accidentally overwrite the current handles
structure in the callback function with the older saved handles structure.

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
To contact Technical Support use the Contact Us link on
http://www.mathworks.com


From: Adam on 16 Jun 2010 18:03
"Steven Lord" <slord(a)mathworks.com> wrote in message <hvbgk2$li7$1(a)fred.mathworks.com>...
>
> "Adam " <abc5(a)ubc.ca> wrote in message
> news:hvbfdk$7dl$1(a)fred.mathworks.com...
> > Hello,
> >
> > I'm having trouble using the 'load' function from within a function. This
> > is to be within a GUI callback to load the handles saved from last
> > session. The problem is load doesn't seem to work from within a callback
> > (nothing is added to the workspace).
>
> It works ... but it doesn't add the variables to the _base_ workspace but to
> the workspace of the _callback function_ in which you called LOAD.
>
> But be very careful when you load the handles structure from a previous run
> ... the objects inside the GUI may not (will likely not) have the same
> handle values as before, so I would only use this if I were trying to
> retrieve data stored in the handles structure, not the handles themselves.
>
> > Is there a work around this? What I'm trying to do is allow the user to
> > save what is in some edit boxes, then load a file to automatically fill
> > them again.
>
> Specify an output argument [which I'll call data] when you call LOAD, then
> refer to data.handles.<the name of the data you want to use> in the
> callback. This ensures you don't accidentally overwrite the current handles
> structure in the callback function with the older saved handles structure.
>
> --
> Steve Lord
> slord(a)mathworks.com
> comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
> To contact Technical Support use the Contact Us link on
> http://www.mathworks.com
>
I just figured it out right before your response Steven. This is exactly what I need to do, thanks a lot.
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