[gdal-dev] CPLFreeConfig() in port/cpl_conv.cpp

[Even Rouault]

Selon Roger Bivand <Roger.Bivand at nhh.no>:

> Hi,
>
> I can get and set ConfigOptions using functions in port/cpl_conv.cpp, but I
> have not found a way of unsetting a ConfigOption, only CPLFreeConfig() which
> NULLs them all. I can also not see how to query which keys are set, so that
> I could store their values, and re-instate them after blowing away all
> options. In the long-running setting of rgdal in R, when GDAL/OGR may be
> running for a whole session, it would be useful to have better control of
> the ConfigOptions on the GDAL side. Am I missing something?

Yes, to clear a config option, just CPLSetConfigOption(key, NULL). See
http://www.gdal.org/cpl__conv_8h.html#aa0cd1a68fe4f2fc7874cd2da605c36ce

However, there's no public way of getting which config options are defined
though, partly because config option can be either defined with
CPLSetConfigOption() or just obtained from the environmenet through getenv().

>
> Grateful for pointers,
>
> Roger
>
>
>
> -----
> Roger Bivand
> NHH Norwegian School of Economics, Bergen, Norway
> --
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