NSOpenPanel runModal Crashes?

Question

I'm have a routine based on code found on this forum:

+ (FSRef)useOpenFileToGetFSRef:(NSString **)fileName requiredFileType: (NSString*) requiredFileType
{
     FSRef fileFSRef;
    NSArray* fileTypes = [[NSArray alloc] initWithObjects:requiredFileType, nil];

    //http://stackoverflow.com/questions/11815784/objective-c-nsopenpanel-get-filename
    NSOpenPanel* openDlg = [NSOpenPanel openPanel];
    [openDlg setFloatingPanel:YES];
    [openDlg setCanChooseDirectories:NO];
    [openDlg setCanChooseFiles:YES];
    [openDlg setAllowsMultipleSelection:YES];
    [openDlg setAllowedFileTypes:fileTypes];

    if ( [openDlg runModal] == NSOKButton )  //<== CRASHES ON CALL TO runModal
    {
        NSArray* filePaths = [openDlg URLs];
        //only getting 1st file
        NSURL *fileUrl = [filePaths objectAtIndex:0];

        *fileName = [fileUrl path];
        CFURLGetFSRef((CFURLRef)fileUrl, &fileFSRef);
    }

    return fileFSRef;
}

The app repeatably crases on the call to runModel:

What could explain this?

Thanks very much in advance to all for any info.

System info: OS X 10.8.4. Compiled using ARC.

Answer 1

I actually think you had a breakpoint on all exceptions. I just ran into this and was looking for why. I ran into this post, but then found the following.

NSOpenPanel crashes when debugging with Xcode 4.5.1

When you recreated the project, the breakpoints got reset.

Answer 2

It looks like there was some anomaly in the project file. I copied all the source files and xib files to a new project, and after that NSOpenPanel runModal worked as expected.

Answer 3

Had a similar problem. I had not been storing all of the project files (same code worked perfectly on another machine). I removed them one-by-one, no effect. Removed DerivedData directory and no effect.

lappy:vStacks ndunn$ hg st . ? StacksGui3.xcodeproj/project.xcworkspace/xcuserdata/ndunn.xcuserdatad/UserInterfaceState.xcuserstate ? StacksGui3.xcodeproj/xcuserdata/ndunn.xcuserdatad/xcschemes/StacksGui3.xcscheme ? vStacks.xcodeproj/project.xcworkspace/xcuserdata/ndunn.xcuserdatad/UserInterfaceState.xcuserstate ? vStacks.xcodeproj/xcuserdata/ndunn.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist ? vStacks.xcodeproj/xcuserdata/ndunn.xcuserdatad/xcschemes/vStacks.xcscheme ? vStacks.xcodeproj/xcuserdata/ndunn.xcuserdatad/xcschemes/xcschememanagement.plist

I was about to do what you did, but I ended up:
1 - deleting my vStacks.xcodeproj and source
2 - creating another one with the same name
3 - deleted the new one
4 - recovered the entire project from source control.

Note: Not sure if steps 2 and 3 are necessary, but 1 and 4 certainly are.