In my application I am downloading some images from the web (from my server to be precise), in order to save some bandwith and especially memory on the phone, I provide them in two resolutions: 480x320 for the "old" iPhone series and in 960x640 for the iPhone 4 with the retina display. Now I need to be able to detect from within the app when it is running on a device that supports the retina screen. How could I do that?
I have been thinking about using the code snippet below which would return me a specific device identifier such as eg. "iPhone3", yet then I would be limiting the detection to the iPhone4 and would need to update that code for any subsequent device with a retina display.
size_t size;
// Set 'oldp' parameter to NULL to get the size of the data
// returned so we can allocate appropriate amount of space
sysctlbyname("hw.machine", NULL, &size, NULL, 0);
// Allocate the space to store name
char *name = malloc(size);
// Get the platform name
sysctlbyname("hw.machine", name, &size, NULL, 0);
// Place name into a string
NSString *machine = [NSString stringWithCString:name];
Is there any better soution (maybe it is very obvious but I missed it)?