[gdal-dev] Redirect CPLDebug output?

[Frank Warmerdam]

On Thu, Sep 8, 2011 at 11:37 AM, Jim Pendleton <jimp at ittvis.com> wrote:
> Frank Warmerdam <warmerdam <at> pobox.com> writes:
>
>> On 11-09-08 07:48 AM, Jim Pendleton wrote:
>> > Is there any model for redirecting CPLDebug output from stdout to an
>> > alternative path?
>>
>> There is no need to overwrite the high level CPLError and CPLDebug
> functions.
>> Instead install a handler for the messages with CPLSetErrorHandler().
>
> That was the information I needed.
>
> For the sake of expediency, I've ifdef'ed __android_log_print() calls
> adjacent to the printf() statements in the existing
> CPLDefaultErrorHandler rather than duplicating the code and adding
> another source file to the build.

Jim,

In fact this might even be the long term solution with an android
#ifdef.

> If I eventually proceed the approved GDAL development way is there a
> standard place to call CPLSetErrorHandler() when loading GDAL as a
> library?  Since I'm running in Java, I wouldn't necessarily have a
> pointer to my C++ function at runtime without some extra hackery (and
> there's no SWIG binding presently for that routine, regardless.)

Ah yes, that does make it more complicated.  I'm not sure of a good
way to have something done automatically at library load time.

I see the gdal_python.i file has an init section for registering drivers.
Something similar might possible in Java.

> I would like to perturb as little of the original GDAL source as
> possible.
>
> If only there existed a gdal.SetConfigOption interface for
> CPLSetErrorHandler() that would allow me to pass an entry point name
> instead of a function pointer...

I see that CPLPushErrorHandler() already does this through
the swig bindings for "well known" error handlers.

I think for now an android ifdef right in CPLDefaultErrorHandler
is appropriate.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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