Re: Calling a Cocoa library from C
Re: Calling a Cocoa library from C
- Subject: Re: Calling a Cocoa library from C
- From: Nathan Sims <email@hidden>
- Date: Sat, 12 Nov 2011 12:01:28 -0800
On 12 Nov 2011, at 18:45, Nathan Sims wrote:
> On Nov 12, 2011, at 10:56 AM, Thomas Davie wrote:
>> Okay, does this mean that an object instantiated by a C function has persistence across C function calls? In the example above you have:
>> [objcCode call];
>> I'm guessing I would have to have:
>> ObjcCode *objcCode;
>> declared globally in the library, and that would suffice?
>
> Declared somewhere certainly – I would highly recommend against it being a global though for all the usual reasons to avoid globals.
Hmm, if not a global, where would the declaration go? The C function certainly shouldn't return it, so if it is to remain persistent across calls, wouldn't the logical (the only?) place for it be as a global in the library's .m file?
Something like this:
mylibrary.m:
-------------------------------------------------
#import "ObjcCode.h"
ObjcCode *objcCode;
. . .
int setup_data()
{
objcCode = [[ObjcCode alloc]init];
return 0;
}
int get_float_data(float *result1, float *result2)
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
[objcCode call];
*result1 = [more stuff];
etc.;
[pool drain];
return 0;
}
int quit_data()
{
[objcCode release];
objcCode = nil;
return 0;
}
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