Exception-like behavior in save panel used for file choose

[Barry Press]

I've written a small app that, from a preferences panel, uses a  
"Choose" button to open a save panel that's used to select the name of  
the file to which the app will log periodic data. That is, the  
preferences panel launches via this code:

// --------------------------------------------------------  
showPreferencesPanel
- (IBAction)showPreferencesPanel: (id)sender
{
        SettingsDialog *settingsMgr;

        settingsMgr = [[SettingsDialog alloc] init];
        [settingsMgr showSettingsPanel:self];
}


and from within the code for the settingsMgr, a button push invokes  
this code to get the file name:


//--------------------------------------------------------  
pushChooseButton ----
- (IBAction)pushChooseButton:(id)sender
{
        // get pathname
        // break into components
        // if pathname is a file
        // drop last one, make path from it
        
        NSSavePanel *save = [NSSavePanel savePanel];
	[save setAllowedFileTypes:[[NSArray alloc] initWithObjects:@"log",  
@"txt", nil]];
        [save setAllowsOtherFileTypes:YES];
        [save setRequiredFileType:@"log"];
	[save setMessage:@"Pick the file to which log messages will be  
appended.\nFiles with the .log file type will open in console by  
default."];
        [save setNameFieldLabel:@"Log To:"];
        [save setPrompt:@"Choose"];
        [save setDelegate:self];
        [save setTitle:@"Log"];
        
	NSString *sFile = [textLogPath stringValue];; // 
stringByStandardizingPath;
        NSString *sFileWithoutLast = [sFile stringByDeletingLastPathComponent];
	NSString *sFileOnly = [sFile substringFromIndex:[sFileWithoutLast  
length]+1];
	//NSLog(@"\nsFile: %...@\nwithout last:%...@\nlast: %@", sFile,  
sFileWithoutLast, sFileOnly );
        
	int result = [save runModalForDirectory:sFileWithoutLast  
file:sFileOnly];
        if (result == NSOKButton){
                NSString *selectedFile = [[save filename] 
stringByStandardizingPath];
                [textLogPath setStringValue:selectedFile];
        }
}

This latter code works properly so long as the file that will be the  
target of the append -- the target of the save panel -- does not  
exist. In that event, the runModal comes back and I can extract the  
name. If the file *does* exist, however, then a panel comes up that  
asks if it's ok to replace the file, and if I agree to replace, not  
only the choose panel closes, so does my settings panel - I'm dumped  
all the way back to the app that invoked showPreferencePane.

I looked at the methods being fired, and nothing much interesting  
comes up. I see

panel:directoryDidChange:
panel:userEnteredFilename:confirmed:
panel:isValidFilename:

and by then the windows are all closed. Any ideas on why the panel  
closes around me?

(Side note: anyone who wants to critique my code for splitting a file  
name off a path, please let her rip!)

Thanks

Barry Press

















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