> On Mar 30, 2015, at 3:00 AM, dangerwillrobinsondan...@gmail.com wrote:
>
>> On 2015/03/25, at 9:44, Daryle Walker <dary...@mac.com> wrote:
>>
>> A segment from my command-line tool:
>>
>>> NSURL * const finalLocation = [NSURL
>>> fileURLWithPath:response.suggestedFilename isDirectory:NO];
>>>
>>> [[NSFileManager defaultManager] moveItemAtURL:location
>>> toURL:finalLocation error:&error];
>>> if (error) {
>>> gbfprint(stderr, @"Error, copying: %@",
>>> error.localizedDescription);
>>> gbfprintln(stderr, error.localizedFailureReason ? @"
>>> (%@)" : @"", error.localizedFailureReason);
>>> returnCode = EXIT_FAILURE;
>>> } else {
>>> gbprintln(@"%@", finalLocation.path);
>>> }
>>
>> When I run the tool a second time, with the same URL argument, so it tries
>> moving the temp file to a place where a file already exists, I get:
>>
>>> Error, copying: “CFNetworkDownload_8gfN5h.tmp” couldn’t be moved to “Debug”
>>> because an item with the same name already exists. (A file with the name
>>> “CFNetworkDownload_8gfN5h.tmp” already exists.)
>>> Program ended with exit code: 1
>>
>> The localized failure reason uses the source file name, the real reason is
>> that the DESTINATION file name is the one already in use.
>>
>> Am I misunderstanding something here, or should I try to figure out how to
>> send in bug reports to Apple?
>>
>> —
> The message is correct.
> In the view of the underlying POSIX API a file exists already with that name
> at that path.
> If your file name is too simplistic you're going to struggle.
> You need to determine your move policy. File names can be unique with simple
> things like timestamps or UUIDs which are easy to create.
> You need to decide whether to unique them (proactively avoid collisions) or
> handle collisions and how.
> You could replace it or append.
There’s already a file with that name at the DESTINATION path. (Except for the
runs where I erase it first, of course. But there’s no error in those runs.)
The error message uses the SOURCE path at both file-name instances, when it
should be the source filename at the first mention (localized description) and
the destination filename at the second mention (localized failure reason).
(“Debug” is the directory containing the destination filename.)
—
Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT mac DOT com
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