Available memory for iPhone OS app

Question

Is there a function or constant defining the amount of available memory for an app in iPhone OS?

I'm looking for a device-independent way (iPod touch, iPhone, iPad) to know how much memory the app has left.

Answer 1

This function will return the available memory in bytes:

#import <mach/mach.h>  #import <mach/mach_host.h>  natural_t  freeMemory(void) {     mach_port_t           host_port = mach_host_self();     mach_msg_type_number_t   host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);     vm_size_t               pagesize;     vm_statistics_data_t     vm_stat;      host_page_size(host_port, &pagesize);      if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size) != KERN_SUCCESS) NSLog(@"Failed to fetch vm statistics");      natural_t   mem_used = (vm_stat.active_count + vm_stat.inactive_count + vm_stat.wire_count) * pagesize;     natural_t   mem_free = vm_stat.free_count * pagesize;     natural_t   mem_total = mem_used + mem_free;      return mem_free; }