檢查檔案權限

檢查檔案權限

NSFileManager 提供文件權限的查詢的方法，分別為：

  • isReadableFileAtPath
  • isWritableFileAtPath
  • isExecutableFileAtPath
  • isDeletableFileAtPath

每個方法都需要指定完整的路徑，透過此方法會返回BOOL值為YES或NO，下面範例透過檔名temp.txt來查詢：

//-----------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------------

輸出結果：

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權限：

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

從命令查詢的看到權限具備 讀(r)、寫(w)　但沒有 執行(x) 權限，對照下來與程式得到的結果是相符的。