Mike Fischer wrote:
12) Finally, my -calculateWorksheetRow looks like:
- (void) calculateWorksheetRow {
// column after column after column ...
I didn't follow this complete discussion thread but I kind of read
between the lines that your operation is actually calling a different
process (Microsoft Excel) using AppleScript? If so you will need to
rethink your strategy I think. To my knowledge AppleScript is not
thread safe
IIRC, AppleScript itself can be used on cooperative threads if you're
careful and know what you're doing, but preemptive threads are right
out. However, since the goal seems to be to control Excel directly
from ObjC, I already suggested to the OP that he switch to appscript,
which is thread-safe and should work fine with Excel.
and running multiple AppleScripts targeting the same app in parallel
(which would be the reason for using an NSOperationQueue in the first
place) will at best not gain you any advantage and at worst crash
yourself and/or Excel.
Sending events from multiple threads won't crash Excel, but could
easily interfere with each others' activities due to the total lack of
locking/transaction support/object ownership in scriptable
applications (one of several significant deficiencies of Apple event
IPC). Best to deal with a single application from a single thread in a
single process at a time, and (particularly if it's a long-running
series of operations) warn users not to run other AppleScripts or do
anything else to interact with that application while it's working.
...
Getting back to the main discussion of the OP's threading/
NSOperationQueue problems, perhaps it would help if he backs up a bit
and explains in general terms what he's trying to achieve, rather than
focus on individual details of how he's currently trying to do it?
That way, folks might be able to suggest a better overall solution,
rather than getting bogged down in the details of the current,
potentially misconceived, approach.
HTH
has
--
Control AppleScriptable applications from Python, Ruby and ObjC:
http://appscript.sourceforge.net
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