Simple test program demonstrating use of NSInvocation to get CGMutablePathRef property by name

CGMutablePathRef_NSInvocation.m

/* Compile and run like so:
$> clang CGMutablePathRef_NSInvocation.m -ObjC -std=c99 -fobjc-arc -framework Foundation -framework CoreGraphics
$> ./a.out
*/

#import <Foundation/Foundation.h>
#import <CoreGraphics/CoreGraphics.h>

@interface TestClass : NSObject

@property CGMutablePathRef path;

@end

@implementation TestClass

@end

int main(int argc, char *argv[]) {
	@autoreleasepool {

		CGMutablePathRef path = CGPathCreateMutable();
		TestClass *test = [TestClass new];
		test.path = path;
		NSLog(@"Original Path: %p", path);
		
		SEL selector = NSSelectorFromString(@"path");
		NSMethodSignature *signature = [test methodSignatureForSelector:selector];
		NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
		[invocation setSelector:selector];
		[invocation setTarget:test];
		[invocation invoke];
		CGMutablePathRef result = NULL;
		[invocation getReturnValue:&result];

		NSLog(@"Result: %p", result);
		
		CGPathRelease(path);
	}
}