Re: NSInvocation problem
Re: NSInvocation problem
- Subject: Re: NSInvocation problem
- From: Sherm Pendley <email@hidden>
- Date: Wed, 24 Nov 2004 16:20:32 -0500
On Nov 24, 2004, at 4:08 PM, email@hidden wrote:
I have a small problem with NSInvocation, im setting an invocation up
like this:
// setWidth: is a method defined by self.
NSMethodSignature* sig = [LayoutControl
instanceMethodSignatureForSelector: @selector(setWidth:)];
NSInvocation* incovation = [NSInvocation
invocationWithMethodSignature:sig];
[invocation setSelector: @selector(setWidth:)];
[invocation setTarget:self];
whenever i try and invoke it, i get this error message:
2004-11-24 16:04:04.970 Cocode[4943] *** -[NSInvocation
copyWithZone:]: selector not recognized
Whats going n here and how can i fix it?
As evidenced by the ':' at the end, setWidth: takes a parameter, but
the code above doesn't provide that parameter to the invocation.
For example, if width is a float:
float newWidth = 0.0;
[invocation setArgument:&newWidth atIndex:2];
(Indexes 0 and 1 are always target & selector, respectively.)
sherm--
Cocoa programming in Perl: http://camelbones.sourceforge.net
Hire me! My resume: http://www.dot-app.org
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