Re: CodeWarrior and Objective-C warnings
Re: CodeWarrior and Objective-C warnings
- Subject: Re: CodeWarrior and Objective-C warnings
- From: Sherm Pendley <email@hidden>
- Date: Wed, 1 Dec 2004 21:14:09 -0500
On Dec 1, 2004, at 7:42 PM, John Stiles wrote:
I have code that looks like this
- (void)connection:(NSURLConnection *)connection
didReceiveResponse:(NSURLResponse *)response
{
if( [response respondsToSelector:@selector(statusCode)] )
{
if( [response statusCode] == 200 )
{
// stuff
}
}
}
When I call [response statusCode] in the code above, CodeWarrior warns
that "receiver cannot handle this message." Obviously this was taken
care of on the previous line, but I can see how a compiler might not
understand this :) How can I placate the compiler and silence the
warning (other than disabling warnings)?
You could use NSInvocation instead of a direct message:
- (void)connection:(NSURLConnection *)connection
didReceiveResponse:(NSURLResponse *)response
{
NSInvocation *anInvocation;
NSMethodSignature *aSig;
int statusCode; // I didn't look this up - declare the type as needed
if( [response respondsToSelector:@selector(statusCode)] )
{
aSig = [response methodSignatureForSelector: @selector(statusCode)];
anInvocation = [NSInvocation invocationWithMethodSignature: aSig];
[anInvocation invokeWithTarget: response];
[anInvocation getReturnValue: &statusCode];
if( statusCode == 200 )
{
// stuff
}
}
}
sherm--
Cocoa programming in Perl: http://camelbones.sourceforge.net
Hire me! My resume: http://www.dot-app.org
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