NSWorkSpace performFileOperation (a)synchronousness
NSWorkSpace performFileOperation (a)synchronousness
- Subject: NSWorkSpace performFileOperation (a)synchronousness
- From: Aandi Inston <email@hidden>
- Date: Thu, 05 Mar 2015 10:36:41 +0000
have a requirement to copy files from my Mac OS app. I find:
success=[NSWorkSpace performFileOperation:NSWorkSpaceCopyOperation
source:nsstring* // source directory path
destination:nsstring* // target directory path
file:nsarray* // nsstring array containing short paths of files or
directories
tag:nsinteger* // on return, <0 on failure, 0 if sync finish, >0 if async
]
My question relates to asynchronousness (is that a word)? It looks like a
synchronous method as it returns a success or failure. But the documentation
says of the tag variable "a positive integer if the operation was performed
asynchronously. If the value is a positive integer, the value is a tag that
identifies the requested file operation." This confuses me. The examples
I've
seen don't do anything special with the tag.
I may be just missing a document giving a context to this...
Its in the past tense. If it said "has been started asynchronously" of
course I
would be looking for a method to wait for completion.
So what does "was performed asychronously" mean?
Do I need to care? In what sense was it asynchronous if my API is waiting
for completion? What is the requested file operation identifier and what API
might I use it with? Do I need to release it?
Thanks in advance
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