[Mono-osx] Problem canceling the opening of a NSDocument
dan at sonocent.com
Wed Apr 25 08:13:17 UTC 2012
I had a similar problem with a different method (ReadFromUrl) where
Cocoa was supplying NULL for the outError parameter in some cases, and
it's not possible to convert null to an "out NSError" parameter in C#.
In the end I just didn't use the method from MonoMac and defined my own
private bool ReadFromUrl2(NSUrl absoluteUrl, string typeName, IntPtr pOutError)
// Set this to an NSError object if an error occurs
// Write the error to the out parameter
if (pOutError != IntPtr.Zero)
if (nsError == null)
Maybe not the best way of solving it, but it worked for me!
On 25/04/2012 05:03, Jon Lipsky wrote:
> Hi All,
> I'm running into a strange problem that I though perhaps someone else
> might have run into and might have a solution for.
> If I were writing a document based application in Objective-C and
> wanted to the user to be able to cancel the opening of a document, I
> could do something like this (which I can confirm works fine):
> - (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName
> error:(NSError **)outError
> // Loading code here...
> *outError = [NSErrorerrorWithDomain:NSCocoaErrorDomain
> code:NSUserCancelledError userInfo:nil];
> The (what seems to me) obvious thing to do in MonoMac would be to
> implement this:
> public override bool ReadFromData (NSData data, string typeName, out
> NSError outError)
> // Loading code here...
> outError = NSError.FromDomain(NSError.CocoaErrorDomain,1376);
> return false;
> However, when I do so, my app crashes with the following stack trace:
> #0 0x9287dfd5 in __wait4 ()
> #1 0x93be04ec in waitpid$UNIX2003 ()
> #2 0x0009fe9b in mono_handle_native_sigsegv (signal=11,
> ctx=0xbfffea5c) at mini-exceptions.c:2192
> #3 0x00004f6e in mono_sigsegv_signal_handler (_dummy=10,
> info=0xbfffea1c, context=0xbfffea5c) at mini.c:5917
> #4 <signal handler called>
> #5 0x9249cd44 in objc_msgSend ()
> #6 0x991622cc in -[NSDocumentController(NSInternal)
> _fixedFailureReasonFromError:] ()
> #7 0x9916b5f4 in -[NSDocumentController
> _willPresentOpeningError:forURL:] ()
> #8 0x9916b197 in -[NSDocumentController
> _openDocumentsWithContentsOfURLs:presentErrors:completionHandler:] ()
> #9 0x9915f749 in -[NSDocumentController openDocument:] ()
> (Rest of stack trace omitted)
> Has anyone else run into this problem, and if so were you able to find
> a solution/workaround?
> Mono-osx mailing list
> Mono-osx at lists.ximian.com
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Mono-osx