如何在运行时可以获得iOS设备CPU架构

#include <sys/types.h>
#include <sys/sysctl.h>
#include <mach/machine.h>

NSString *getcpuType(void)
{
    NSMutableString *cpu = [[NSMutableString alloc] init];
    size_t size;
    cpu_type_t type;
    cpu_subtype_t subtype;
    size = sizeof(typE);
    sysctlbyname("hw.cputype",&type,&size,NULL,0);

    size = sizeof(subtypE);
    sysctlbyname("hw.cpusubtype",&subtype,0);

    // values for cputype and cpusubtype defined in mach/machine.h
    if (type == cpu_TYPE_X86)
    {
            [cpu appendString:@"x86 "];
             // check for subtype ...

    } else if (type == cpu_TYPE_ARM)
    {
            [cpu appendString:@"ARM"];
            switch(subtypE)
            {
                    case cpu_SUBTYPE_ARM_V7:
                    [cpu appendString:@"V7"];
                    break;
                    // ...
            }
    }
    return [cpu autorelease];
}