检查档案权限

检查档案权限

NSFileManager 提供文件权限的查询的方法，分别为：

  • isReadableFileAtPath
  • isWritableFileAtPath
  • isExecutableFileAtPath
  • isDeletableFileAtPath

每个方法都需要指定完整的路径，透过此方法会返回BOOL值为YES或NO，下面范例透过档名temp.txt来查询：

//-----------start-----------
    NSFileManager *filemanager;

    filemanager = [NSFileManager defaultManager];

    NSLog(@"isExecutableFileAtPath =%@",([filemanager isExecutableFileAtPath:@"/tmp/temp.txt"] == YES? @"YES":@" NO"));
    NSLog(@"isReadableFileAtPath   =%@",([filemanager isReadableFileAtPath:@"/tmp/temp.txt"] == YES? @"YES":@" NO"));
    NSLog(@"isWritableFileAtPath   =%@",([filemanager isWritableFileAtPath:@"/tmp/temp.txt"] == YES? @"YES":@" NO"));
    NSLog(@"isDeletableFileAtPath  =%@",([filemanager isDeletableFileAtPath:@"/tmp/temp.txt"] == YES? @"YES":@" NO"));

//------------end------------

输出结果：

2014-02-21 17:16:55.304 test1[56893:303] isExecutableFileAtPath = NO
2014-02-21 17:16:55.306 test1[56893:303] isReadableFileAtPath   =YES
2014-02-21 17:16:55.307 test1[56893:303] isWritableFileAtPath   =YES
2014-02-21 17:16:55.308 test1[56893:303] isDeletableFileAtPath  =YES

另外直接用命令查看一下权限：

-rw-r--r--  1 danny           wheel     0  2 21 17:01 temp.txt

从命令查询的看到权限具备 读(r)、写(w)　但没有 执行(x) 权限，对照下来与程式得到的结果是相符的。