将NSArray写入文件

Question

我试图保存/写一个数组到文件目录,我完全卡住了.我已经在线查看了多个来源的代码.我从和NSArray切换到NSMutableArray,但是没有用.据我所知,文件没有被写入,因为测试将返回null.提前致谢

NSArray *results = [parser objectWithData:data1];

NSMutableArray *array2 = [[NSMutableArray alloc] initWithArray:results];
// Create a dictionary from the JSON string  

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"EmployeeData.plist"];

//NSLog(@"the path is %@, the array is %@", path, array2);

/////write to file/////
[array2 writeToFile:path atomically:YES];

NSMutableArray *test = [[NSMutableArray alloc ]initWithContentsOfFile:path];

NSLog(@"the test is %@", test);

**更新**

我添加了这些代码行

BOOL write = [results writeToFile:path atomically:YES];

NSLog(@"did it right? %@", write);

并且写为null,这是什么意思？

这是我的Array中的众多对象之一

{
     0 = "<null>";
    1 = "John Doe";
    10 = 512;
    11 = "<null>";
    12 = 1;
    13 = 1;
    2 = Doe;
    3 = Jon;
    4 = "<null>";
    5 = johndoe;
    6 = "<null>";
    7 = "<null>";
    8 = "john@doe.com";
    9 = "<null>";
    Type = 1;
    Active = 1;
    Depart = "<null>";
    Emp = "<null>";
    Ext = "<null>";
    FirstName = Jim;
    Fl = 512;
    Name = "John Doe";
    Log = jd;
    Mobile = "<null>";
    Title = "<null>";
}

空值是否与它有关？

解决了!!

我意识到空值可能导致一些问题,所以我改变了我的查询以处理它并立即保存.上面的代码100%正确,它的工作原理!

谢谢您的帮助

Answer 1

按照该文件,writeToFile:只有工作,如果你的数组的内容仅限于类型屈指可数(NSString,NSData,NSArray,或NSDictionary对象).如果您的数组中有任何其他类型的对象,则它将无法正确写入文件(或根本不写入文件).

另请注意,writeToFile:返回一个布尔值,指示操作是否成功.

如果您的数组包含不兼容的类型,则必须使用类似NSKeyedArchiver的内容来序列化数据.