Unable to read metadata during the process or Slow?

i trying write metadata hundreds of files @ time. need me able write , read updated metadata in same process.say add last name photo title append first name title. each piece of data operation can set overwrite or append field.

 

the problem when enclose entire operation inside withwriteaccessdo block. in case if overwrite title field last name , thend in next operation try append first name. problem not updated metadata in title field, returns orginal value!

 

i can fix putting withwriteaccessdo block inside operation loop during each operations uses new withwriteaccessdo block. way updated metadata can read append correctly. problem meathod takes long time! hours! before in lightroom 2 whole operation take place in under 30 seconds , takes , hour!

 

so here pusdocode

 

1 not old data correctly

withwriteaccessdo

     each operation

          if overwite

               write data field

          else if append

               current filed data

               concat old data data added

               write new data

          end

     loop

end withwriteaccessdo

 

2 works takes long time

for each operation

     withwriteaccessdo

          if overwite

               write data field

          else if append

               current filed data

               concat old data data added

               write new data

          end

     end withwriteaccessdo

loop

 

anything doing wrong?

lightrooom has been extensively reworked under hood far catalog writes go.

 

before: writes wrote.

now: writes accumulated in transaction not committed (and hence not accessible) until exiting with-write gate. and,

complete undo info saved every write.

 

so, effiiciency either:

1) make "to-do" functions

2) save "to-do" info.

 

then, call these "to-do" functions, or process saved "to-do" info in single write-gate, or in succession of dependent write-gates.

 

rob

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