Re: NSWindow not being shown on Intel Mac

FROM : Ricky Sharp
DATE : Fri Nov 02 21:16:39 2007

On Nov 2, 2007, at 1:37 PM, Ryan Harter wrote:

> I have written a program to mute the volume if headphones aren't 
> plugged in,
> or if the user attempts to unmute the volume without headphones for 
> a lab
> setting.  When the user attempts to change the volume or unplugs the
> headphones, a window appears saying Sound is disabled, please use
> headphones.
> This all works great on PPC macs, but for some reason on an intel 
> iMac, the
> windows doesn't appear when the headphones are unplugged, only if 
> the user
> attempts to change the volume.  I know the if statement is being 
> called
> because it mutes the volume when the headphones are unplugged, it just
> doesn't show the window.  This is also only happening on the intel 
> macs.
> Here is my code:
>
> if([self usingInternalSpeakers] && ![self soundIsMuted])
>
> {
>
> [self muteSound];
>
> //this makes sure our window is on top
>
> [NSApp activateIgnoringOtherApps:YES];
>
> //show the window
>
> [alertWindow makeKeyAndOrderFront:nil];
>
> }
>
>
> alertWindow is an NSWindow, and it works fine if the user attempts 
> to change
> the volume, just not when headphones are unplugged.  My listener 
> code is
> here:
>
>
> FourCharCode dataSource;
>
> UInt32 size = sizeof(dataSource);
>
> OSStatus err = AudioDeviceGetProperty(defaultSystemOutputDeviceID, 
> 0, 0,
> kAudioDevicePropertyDataSource, &size, &dataSource);
>
> NSCAssert((err == noErr), @"AudioDeviceGetProperty failed to get the
> kAudioDevicePropertyDataSource property");
>
> //'ispk' == internal speakers
>
> //'hdpn' == headphones
>
> return dataSource == 'ispk';
>
>
> Do intel macs work differently for kAudioDeviceGetProperty, or
> makeKeyAndOrderFront?



The first thing that comes to my mind is if this is a byte-swapping 
issue on those four-char-codes.

Also, please don't cross-post.  This response is only going to cocoa-
dev.

___________________________________________________________
Ricky A. Sharp        mailto:<email_removed>
Instant Interactive(tm)  http://www.instantinteractive.com