You can't pass a method so you'll have to write a C function as your callback
function. If the library allows you to pass a parameter to the function which
will be in turn passed to the callback, then you would pass your view
controller to the function and then call the method from the function. Your
callback function would look something like
void callback(void* context)
{
[(MyViewController*) handleCallback];
}
If the library doesn't let you provide a context then you're probably stuck
with saving your VC's address in a global variable that your callback can use.
Dave Carrigan
Seattle, WA
On Sep 8, 2010, at 1:21 AM, Remco Poelstra <re...@beryllium.net> wrote:
> Hi all,
>
> I'm very new to Cocoa and I'm trying to build my first app after reading and
> doing tutorials.
> I've a view with a UITextView on it and a button. When I press the button I
> want to call a third party C library which sends out and UDP packet searching
> for devices on the network. The responses of the devices are reported back
> with a callback that I've to supply.
> In the callback I want to store the string information in a NSMutableString
> and then update the UITextView with that string.
> I've a few problems: How can I pass a method from an object to the C library
> as callback? I'm currently using the NSViewController to define the
> method/callback.
> If that's not possible, how can I define a function that can reach the
> objects of my application? The ViewController is stored in the
> ApplicationDeletegate, but I can't find any reference to that object.
> I've defined the NSMutableString as a global in the viewcontroller header
> file, is that a good idea given the MVC design pattern?
> Hope someone can get me started on this one.
>
> Kind regards,
>
> Remco Poelstra
>
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