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Re: Displaying an alert box
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Re: Displaying an alert box


  • Subject: Re: Displaying an alert box
  • From: David McCabe <email@hidden>
  • Date: Mon, 15 Oct 2001 10:37:38 -0700

The NSAlert look about what I need. So, in the current version it would jump up in the Dock, right?

I don't see NSAlert in the AppKit reference. Where would the docs be? Would you mind a line or two of sample code?

Thanks!

On Monday, October 15, 2001, at 09:48 AM, Douglas Davidson wrote:

Let me expand a little on the distinction between NSAlert and CFUserNotification.

NSAlert is the standard means for a Cocoa application to put up an alert dialogue. It is the appropriate way for an application to alert the user about goings on in that application ("This document is 500 pages long. Are you sure you wish to discard it?"). When an application other than the currently active one puts up an NSAlert, Cocoa generally makes efforts to notify the user by some means that the application needs attention, though the actual means used may potentially depend on the OS version or on user preferences (for example, once we have holographic displays, the application's icon might jump out of the screen and do a backflip). You should be able to find information on NSAlert among the Cocoa reference documentation.

The primary design purpose of the User Notification Center, AKA CFUserNotification, is to provide means for background processes, system daemons, the kernel, and other tasks that otherwise do not have a GUI interface, to have some limited form of interaction with the user--for example, to request a necessary password, or to notify the user of some significant happening ("Your computer has caught on fire. Please extinguish it."). It has low-level interfaces (CFUserNotification is the CF-level one) so that it can be used almost anywhere in the system. The promise it makes is that it will attempt to present the notification requested to a user at the console in some form, if possible, but it does not guarantee what form this will take. It can also be used by applications that have GUI interfaces of their own, but this should be done sparingly, because the form it takes is often quite intrusive (currently it will usually put up dialogues that float above almost everything else, although they are non-modal and can be moved out of the way). The only documentation I know of at the moment for CFUserNotification is in the header file, but I can provide some sample code for those who need help.

Douglas Davidson

On Monday, October 15, 2001, at 03:17 AM, Stiphane Sudre wrote:

On dimanche, octobre 14, 2001, at 05:02 , David McCabe wrote:

How about in Objective-C?

On Saturday, October 13, 2001, at 06:32 PM, Simon Wright wrote:

On Saturday, October 13, 2001, at 08:30 PM, David McCabe wrote:

Greetings,

I would like to have my application display an alert panel which comes to the foreground above all other applications. Despite the simplicity of this task, I have found nothing in the documentation about displaying alerts of any kind, except a small bit on sheets. Can any of you help?

Thanks!

How about CFUserNotification ?

SInt32 CFUserNotificationDisplayAlert(CFTimeInterval timeout, CFOptionFlags flags, CFURLRef iconURL, CFURLRef soundURL, CFURLRef localizationURL, CFStringRef alertHeader, CFStringRef alertMessage, CFStringRef defaultButtonTitle, CFStringRef alternateButtonTitle, CFStringRef otherButtonTitle, CFOptionFlags *responseFlags);


--
David McCabe
http://homepage.mac.com/davidmccabe/
'finger email@hidden' for PGP key.
No PGP sig because it's broken. Will fix soon.
Wrfhf ybirf lbh!


  • Follow-Ups:
    • Re: Displaying an alert box
      • From: Douglas Davidson <email@hidden>
    • Re: Displaying an alert box
      • From: "Erik M. Buck" <email@hidden>
    • Re: Displaying an alert box
      • From: Finlay Dobbie <email@hidden>
    • Re: Displaying an alert box
      • From: Stéphane Sudre <email@hidden>
References: 
 >Re: Displaying an alert box (From: Douglas Davidson <email@hidden>)

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