If you edit the scheme in Xcode (Product menu > Edit Scheme) you can set
Quartz Composer as the executable, and use the Xcode debugger as usual to
examine variables, set breakpoints to step through code, etc - also your
NSLog messages will show up in the Xcode console when you do this.


On 5 November 2012 12:21, Christophe Leske <[email protected]> wrote:

> Hello,
>
> I am new to the world of Quartz Composer and Objective-C.
>
> I have just written my first patch, it does also appear in the
> environment, so I am quite happy.
>
> However, the patch does not what it is intended to do, namely to dump out
> some pixel values of the received input image.
>
> Is there any document somewhere that would describe how one is supposed to
> debug a self-written patch? How to put out information from the patch for
> testing purposes?
>
> I am currently just using NSLog, but this doesn't seem to work.
>
> How do others debug their patches in QC?
>
> Thanks in adavance,
>
> --
> Christophe Leske
> multimedial.de
>
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