Using Cocoa to create an icon for a folder

Question

In my Mac OS application, I\'m prompting a user to create a new folder. I would like to apply an icon to this folder using Cocoa when it is created. Currently, to create the

Answer 1

The NSWorkspace method works like a charm here. Maybe your icon is in an invalid format?
I tried setIcon: using the Finder icon:

- (IBAction)setFolderIcon:(id)sender
{
    NSOpenPanel* openPanel = [NSOpenPanel openPanel];
    [openPanel setCanChooseFiles:NO];
    [openPanel setCanChooseDirectories:YES];
    switch([openPanel runModal])
    {
        case NSFileHandlingPanelOKButton:
        {
            NSURL* directoryURL = [openPanel directoryURL];
            NSImage* iconImage = [[NSImage alloc] initWithContentsOfFile:@"/System/Library/CoreServices/Finder.app/Contents/Resources/Finder.icns"];
            BOOL didSetIcon = [[NSWorkspace sharedWorkspace] setIcon:iconImage forFile:[directoryURL path] options:0];
            NSLog(@"%d", didSetIcon);
            [iconImage release];
        }
        case NSFileHandlingPanelCancelButton:
        {
            return;
        }
    }
}