[QGIS-Developer] ProcessingAlgorithm: get filename of the INPUT param

[Nyall Dawson]

On Wed, 19 Jun 2019 at 22:20, Richard Duivenvoorde <rdmailings at duif.net> wrote:
>
> Hi,
>
> got a question from somebody who needed to find the filename of an input
> param in a ProcessingAlgorithm
> (because he is going to read that file again or something like that).

Short answer -- it's not possible, and if you DO find a workaround, DON'T do it.

By design feature sources aren't layers, and the features coming from
a feature source may not even be associated with any layer at all. If
you need to get the path to a input file, you should be using a vector
layer parameter instead (but be very careful of thread safety issues,
and consider returning the FlagNoThreading flag for your algorithm to
ensure it's not crashy)

Nyall