如何获得iphone设备的剩余空间

在手机终端开发的时候,我们需要关注手机剩余空间,因为手机不像电脑一样空间宽裕,当设备空间比较少得时候需要释放空间.

用法：先引入头文件   

#include <sys/param.h>  

#include <sys/mount.h>

代码片段:

+ (long long) freeDiskSpaceInBytesByMB{

    struct statfs buf;

    long long freespace = -1;

    if(statfs("/var", &buf) >= 0){

        freespace = (long long)(buf.f_bsize * buf.f_bfree);

    }

    return freespace/1024/1024;

}

 

先来说说statfs这个东东,这是C语言函数,下面是官方的介绍:

#if __DARWIN_64_BIT_INO_T

 struct statfs __DARWIN_STRUCT_STATFS64;

#else /* !__DARWIN_64_BIT_INO_T */

 

/*

 * LP64 - WARNING - must be kept in sync with struct user_statfs in mount_internal.h.

 */

struct statfs {

short f_otype; /* TEMPORARY SHADOW COPY OF f_type */

short f_oflags; /* TEMPORARY SHADOW COPY OF f_flags */

long f_bsize; /* fundamental file system block size */

long f_iosize; /* optimal transfer block size */

long f_blocks; /* total data blocks in file system */

long f_bfree; /* free blocks in fs */

long f_bavail; /* free blocks avail to non-superuser */

long f_files; /* total file nodes in file system */

long f_ffree; /* free file nodes in fs */

fsid_t f_fsid; /* file system id */

uid_t f_owner; /* user that mounted the filesystem */

short f_reserved1; /* spare for later */

short f_type; /* type of filesystem */

long f_flags; /* copy of mount exported flags */

long    f_reserved2[2]; /* reserved for future use */

char f_fstypename[MFSNAMELEN]; /* fs type name */

char f_mntonname[MNAMELEN]; /* directory on which mounted */

char f_mntfromname[MNAMELEN];/* mounted filesystem */

char f_reserved3; /* For alignment */

long f_reserved4[4]; /* For future use */

};

 

#endif /* __DARWIN_64_BIT_INO_T */