Strange nil value problem

hi everyone,

 

i've been working on lightroom plugin , have interesting problem, values should not nil prior export (ie must true export button enabled) nil afterwards. happens users of plugin, not all, , tricky thing can't reproduce myself.

 

the user selects event photos etc via dialog , exports.

there observer function on several variables check if chosen parameters correct/sane etc.

 

after checking several variables last 1 :

 

function dialogsections.updatecantexportstatus( propertytable )

 

..

.

 

if propertytable.loggedin , propertytable.finishedloading , propertytable.chosenevent , (propertytable.category or propertytable.auto_create) then

                         propertytable.lr_cantexportbecause = nil

                         propertytable.lr_canexport = true

        return

end

 

the problem occurs later in processrenderedphotos function.

i copy of propertytable via:

 

function ftpuploader.processrenderedphotos(functioncontext, exportcontext)

          local exportsession = exportcontext.exportsession

          local exportparams = exportcontext.propertytable

and afterwards in code, users following error triggered:

if not exportparams.chosenevent then

                              lrerrors.throwusererror( loc "$$$/upload/errors/invalidparameters=please choose event dialog before exporting." )

                              return

          end

 

so seems chosenevent variable nil, when had not nil in order export button able pressed in first place. button enabled/disabled state working correctly.

 

right assume propertytable variables visible between dialog being displayed , export taking place?

 

the fact happens people makes me think kind of race condition, last if-clause place export button set enabled.

 

if has seen kind of thing happening before, i'd appreciate help!

 

best regards,

 

chris.

hi chris,

 

i won't able - i've never experienced such strange behavior. couple comments fwiw:

 

default state of cantexportbecause false (i.e. *can* export).

 

so if updatecantexportbecause has not been called, case when 1 export, despite chosenevent being false.

 

for example, if you've loaded lightroom, choose export via preset chosen on context menu, export dialog box never have been displayed, , start-dialog never have been called.

 

let know how turns out, ok?

 

rob

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