This is a really weird problem (in my view, anyway), because it only occurs in
a very particular set of circumstances. My application is NSDocument based
(just in case it makes a difference), and my application uses ARC.
I have an NSArray of NSDictionary containing file information, and this is
displayed in an NSTableView.
If I open the document and then shut it again without doing anything, all is
well. The memory is released as it should be, and the document closes neatly.
If I open the document and then double click on a file in the list, the data in
that file is unpacked into a file in my application's cache folder and is then
opened (using [[NSWorkspace sharedWorkspace] openFile:filepath];). If I then
close the opened file and then close my document, the memory is released as it
should be, and the document closes neatly.
If I open the document and then double click on a file in the list, but then
close my document **before** closing the newly opened file my application
crashes with "message sent to deallocated instance".
I can't for the life of me work out why this crash is happening. My
understanding was that, once [[NSWorkspace sharedWorkspace] openFile:filepath]
completes the newly opened file is entirely independent of the application or
process that spawned it. Am I right in supposing that there's some magic
thread which means that my application knows that it has opened a document, and
that document hasn't yet been closed? Is there some observer at work here -
and, if so, how do I fix it?
The code:
- (void)openAttachmentInViewer:(id)sender
{
@autoreleasepool
{
NSString* filepath;
if ([_attachmentTable selectedRow] < 0 || [_attachmentTable
selectedRow] >= [attachmentArray count]) return;
if ([_attachmentTable numberOfSelectedRows] == 1)
{
id record = [attachmentArray objectAtIndex:[_attachmentTable
selectedRow]];
NSArray* paths =
NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString* pathStem;
//Check for Viewer directory in Caches and create it if it doesn't
exist
NSFileManager *fileManager= [NSFileManager defaultManager];
NSError *error = nil;
if(![fileManager createDirectoryAtPath:[NSString
stringWithFormat:@"%@/Viewer",[paths objectAtIndex:0]]
withIntermediateDirectories:YES
attributes:nil
error:&error])
{
NSLog(@"Failed to create directory \"%@\". Error: %@ - Cached
file saved in general cache folder.",
[NSString stringWithFormat:@"%@/Viewer",[paths
objectAtIndex:0]],
error);
pathStem = [paths objectAtIndex:0];
}
else
{
pathStem = [NSString stringWithFormat:@"%@/Viewer",[paths
objectAtIndex:0]];
}
filepath = [NSString stringWithFormat:@"%@/%@",pathStem,[record
objectForKey:@"name"]];
NSData* thisAttachment = [[NSData alloc] initWithData:[record
objectForKey:@"data"]];
[thisAttachment writeToFile:filepath atomically:NO];
[[NSWorkspace sharedWorkspace] openFile:filepath];
}
}
}
All ideas and suggestions welcome!
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