Question

有人可以帮我理解我用这种方法做错了吗？

我正在尝试以递归方式检测目录的内容，并在每个目录中创建一个xml文件。非递归完美地工作并输出正确的xml文件。在dir检测上递归扼流并在“目录”元素下添加所有文件+目录。

_dirArray = [[NSMutableArray alloc] init];
_fileArray = [[NSMutableArray alloc] init];

NSError *error;
NSFileManager *filemgr = [NSFileManager defaultManager];
NSArray *filelist = [filemgr contentsOfDirectoryAtPath:dirPath error:&error];

for (int i = 0; i < filelist.count; i++)
{   
    BOOL isDir;
    NSString *file = [NSString stringWithFormat:@"%@", [filelist objectAtIndex:i]];
    [_pathToDirectoryTextField stringValue], [filelist objectAtIndex:i]];

    if ([filemgr fileExistsAtPath:dirPath isDirectory:&isDir] && isDir) // I think this is what is crapping out.
    {
        [_dirArray addObject:file];
    }
    else
    {
        if ([file hasPrefix:@"."])
        {
            // Ignore file.
        }
        else
        {
            [_fileArray addObject:file];
        }
    }
}

感谢任何提示人员。

Answer 1

我可以看到“if（[fileManager fileExistsAtPath：fontPath isDirectory：＆amp; isDir]＆amp;＆amp;＆amp; isDir）”来自Apple的文档示例，但要零碎地复制它并将其与其他一起使用是一个非常糟糕的主意，除非你只想得到目录或删除文件，因为它意味着：

if (itexists and itsadirectory){
     //its a existing directory
     matches directories
}else{
    //it is not a directory or it does not exist
    matches files that were deleted since you got the listing 
}

这是我将如何做到的：

NSString *dirPath = @"/Volumes/Storage/";

NSError *error;
NSFileManager *filemgr = [NSFileManager defaultManager];
NSArray *filelist = [filemgr contentsOfDirectoryAtPath:dirPath error:&error];

for (NSString *lastPathComponent in filelist) {
    if ([lastPathComponent hasPrefix:@"."]) continue; // Ignore file.
    NSString *fullPath = [dirPath stringByAppendingPathComponent:lastPathComponent];
    BOOL isDir;
    BOOL exists = [filemgr fileExistsAtPath:fullPath isDirectory:&isDir];

    if (exists) {
        if (isDir) {
            [_dirArray addObject:lastPathComponent];                
        }else{
            [_fileArray addObject:lastPathComponent];                
        }                    
    }
}

NSFileManager fileExistsAtPath：isDirectory问题

1 个答案: