I thought that NSError is just an output parameter, which is set only in case of errors.
But in my completion handler block (see below) NSError MUST be initialized to
nil, or it will NOT be set.
The same code works as expected when NOT inside a block.
#define REMOVE_BUG // if this is NOT defined, we get:
[...] __-[Alias_TestAppDelegate openAliasFile:]_block_invoke_1 outError1
0x10057f3b0 (NOT initialized)
[...] __-[Alias_TestAppDelegate openAliasFile:]_block_invoke_1 outError2
0x10057f3b0 (after error return)
[...] -[NSOpenPanel recoveryAttempter]: unrecognized selector sent to instance
0x10057f3b0
Here is the code:
- (IBAction)openAliasFile: sender;
{
(void)sender;
NSOpenPanel *openPanel = [ NSOpenPanel openPanel ];
[ openPanel setAllowsMultipleSelection: NO ];
[ openPanel setCanChooseDirectories: NO ];
[ openPanel setResolvesAliases: NO ];
[ openPanel setMessage: @"Select Alias File" ];
[ openPanel beginSheetModalForWindow: self.window
completionHandler:
^(NSInteger result)
{
if (result == NSOKButton)
{
NSURL *bookmarkFileURL = [
openPanel URL ];
[ [ self window ]
setTitleWithRepresentedFilename: [ bookmarkFileURL path ] ];
[ openPanel orderOut:self]; // close panel
before we might present an error
// if <bookmarkFileURL> is
NOT an alias file, <bookmarkData> will be nil, but <outError>
// is NOT set. Works
correctly if we initialise <outError> to nil.
#ifdef REMOVE_BUG
NSError *outError = nil;
#else
NSError *outError;
NSLog(@"%s outError1 %p (NOT
initialized)",__FUNCTION__, outError);
#endif
NSData *bookmarkData = [ NSURL
bookmarkDataWithContentsOfURL: bookmarkFileURL
error:
&outError
];
if ( bookmarkData == nil )
// error
{
NSLog(@"%s outError2 %p
(after error return)",__FUNCTION__, outError);
[ self presentError:
outError
modalForWindow: [ self window ]
delegate: nil
didPresentSelector: NULL
contextInfo: NULL
];
return;
};
// do something with valid
bookmarkData
}
else // cancelled
{
self.dataString = @"--
Cancelled --";
};
}
];
}
Kind regards,
Gerriet.
P.S. Tested on 10.6.6
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