StartAsyncTask using and obtaining a return value
Hello
I'm just starting to try and learn LUA and all Lightroom SDK. Here is a sample of my code:
local lrApplication = import "LrApplication".
local LrTasks = import "LrTasks".
local activeCatalog = lrApplication.activeCatalog)
local currentPhotos = activeCatalog:getMultipleSelectedOrAllPhotos()
are there local = LrTasks.startAsyncTask (function () return currentPhotos [1]: getFormattedMetadata ('fileName') end)
wheneven check or try to use y sucks.
Please someone tell me the stupid thing, I am doing wrong so I lose more hair decrease.
I know that currentPhotos has 5 photos in its collections, because later I do this:
because me, I onePhoto in ipairs (currentPhotos)
and he travels 5 times, matches to the top for the number of photos in the folder I selected in Lightroom.
Thank you.
Start-async-task does not return a value, it just schedules a task and keeps going on - the job runs later.
In general, it is best to start a task immediately in response to a menu button or press selection... and everything in this task. -then you don't need to start anywhere, unless you need it like real parallel processes, such as background tasks.
To avoid multiple tasks from due to asynchronous events, use a form any to avoid recursion.
Rob
Tags: Photoshop Lightroom
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Benton says:
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Hi all
I use Oracle 10.2.0
I have a problem in the return values of the procedures if there is no exception.
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Please advice...
TIA,ORCLDB wrote:
Hi allI use Oracle 10.2.0
I have a problem in the return values of the procedures if there is no exception.
Ok
The code you have posted is not valid code if you have forgotten some important things. However, we will make it simple...
If you have a set OUT that will not be filled if an exception is thrown, unless it is set to NOCOPY.
Example of...
Here, we regularly parameter output and when an exception occurs in procedure B it REVIVAL of the exception to the procedure a...
SQL> ed Wrote file afiedt.buf 1 create or replace procedure B (p_in in number, p_valid out varchar2) as 2 dummy number; 3 begin 4 select 1 into dummy from dual where p_in = 1; 5 p_valid := 'OK'; 6 exception when others then 7 p_valid := 'EXCEPTION'; 8 raise; 9* end b; SQL> / Procedure created. SQL> create or replace procedure A (p_in in number) as 2 v_valid varchar2(10); 3 begin 4 B(p_in, v_valid); 5 dbms_output.put_line('Returned without exception: '||v_valid); 6 exception when others then 7 dbms_output.put_line('Returned with exception: '||v_valid); 8 raise; 9 end A; 10 / Procedure created. SQL> exec a(1); Returned without exception: OK PL/SQL procedure successfully completed. SQL> exec a(2); Returned with exception: BEGIN a(2); END; * ERROR at line 1: ORA-01403: no data found ORA-06512: at "SCOTT.A", line 8 ORA-06512: at line 1
Obviously, when the procedure B raised an exception it went directly to the procedure exceptions A manager that indicates that an exception has happened and the value returned in the OUT parameter was NULL.
Now, if procedure B just handles the exception rather than erect in...
SQL> ed Wrote file afiedt.buf 1 create or replace procedure B (p_in in number, p_valid out varchar2) as 2 dummy number; 3 begin 4 select 1 into dummy from dual where p_in = 1; 5 p_valid := 'OK'; 6 exception when others then 7 p_valid := 'EXCEPTION'; 8* end b; SQL> / Procedure created. SQL> exec a(1); Returned without exception: OK PL/SQL procedure successfully completed. SQL> exec a(2); Returned without exception: EXCEPTION PL/SQL procedure successfully completed.
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SQL> ed Wrote file afiedt.buf 1 create or replace procedure B (p_in in number, p_valid out NOCOPY varchar2) as 2 dummy number; 3 begin 4 select 1 into dummy from dual where p_in = 1; 5 p_valid := 'OK'; 6 exception when others then 7 p_valid := 'EXCEPTION'; 8 raise; 9* end b; SQL> / Procedure created. SQL> exec a(1); Returned without exception: OK PL/SQL procedure successfully completed. SQL> exec a(2); Returned with exception: EXCEPTION BEGIN a(2); END; * ERROR at line 1: ORA-01403: no data found ORA-06512: at "SCOTT.A", line 8 ORA-06512: at line 1 SQL>
Now, as in the first example, procedure B defines the output parameter and throws the exception, causing execution to go directly to the procedure A exception handler, but this time, A procedure return parameter value out.
To understand the execution of blocks and managing exceptions take a look at this article...
[PL/SQL 101: exception handling | http://forums.oracle.com/forums/thread.jspa?threadID=697262&tstart=50]
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