将 int32_t 存储在 NSDictionary 中
如何将 int32_t 类型的变量（例如 ABPropertyID）存储在 NSDictionary 中？
[NSNumber numberWithInt:...] 似乎不起作用。
谢谢
来自评论：
NSLog(@" %@ %@ ", [NSNumber numberWithLong:kABPersonFirstNameProperty], kABPersonFirstNameProperty);
打印：0（空）有什么想法吗？
How can I store a variable of type int32_t (e.g. for ABPropertyID) in an NSDictionary?
[NSNumber numberWithInt:...] doesn't seem to work.
Thanks
From the comments:
NSLog(@" %@ %@ ", [NSNumber numberWithLong:kABPersonFirstNameProperty], kABPersonFirstNameProperty);
Prints: 0 (null) Any ideas?
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+[NSNumber numberWithInteger:]将在所有 32 位和 64 位系统上很好地保存 32 位数字。+[NSNumber integerValue]将检索它。如果你需要它未签名，你可以使用“+[NSNumber numberWithUnsignedInteger:]”。+[NSNumber numberWithInteger:]will hold a 32-bit number nicely on all 32-bit and 64-bit systems.+[NSNumber integerValue]will retrieve it. If you need it unsigned you can use ``+[NSNumber numberWithUnsignedInteger:]`.我在这里假设戴夫的问题特定于 kAB... 常量 - 在这种情况下我可能会错误地忽略以下内容:)
我相信这里的问题不是您使用了不正确的语法；而是您使用了错误的语法。这是一个初始化顺序问题。我猜测您在初始化 kAB... 常量之前尝试此操作 - 例如，通过调用
ABAddressBookCreate()。有点令人困惑的问题是代码片段：NSLog(@" %@ %@ ", [NSNumber numberWithLong:kABPersonFirstNameProperty], kABPersonFirstNameProperty);应该是：
NSLog(@" %@ %d ", [NSNumber numberWithLong:kABPersonFirstNameProperty], kABPersonFirstNameProperty);这是我的输出 - 在调用
ABAddressBookCreate()之前：NSLog(@"Check: %d %d %d ", kABPersonFirstNameProperty,kABPersonMiddleNameProperty,kABPersonLastNameProperty);产生
调用后，产生相同的日志语句
I assume here that Dave's issue is specific to the kAB... constants--I may be mistaken in which case ignore the following :)
I believe that the issue here is not that you are using incorrect syntax; it's an order-of-initialization problem. I'm guessing that you are attempting this operation before having initialized the kAB... constants -- e.g., by calling
ABAddressBookCreate(). Somewhat confusing the issue is the snippet:NSLog(@" %@ %@ ", [NSNumber numberWithLong:kABPersonFirstNameProperty], kABPersonFirstNameProperty);which should be:
NSLog(@" %@ %d ", [NSNumber numberWithLong:kABPersonFirstNameProperty], kABPersonFirstNameProperty);Here's my output -- prior to calling
ABAddressBookCreate():NSLog(@"Check: %d %d %d", kABPersonFirstNameProperty,kABPersonMiddleNameProperty,kABPersonLastNameProperty);produces
after the call, the same log statement produces
正如其他人所说，
NSNumber将适用于此。但是，您至少应该模糊地了解其他两个选项： CFDictionary（与底层的 NSDictionary 相同，但它允许您存储任意指针或指针） - 大小的整数）和 NSMapTable。As everyone else has said,
NSNumberwill work for this. However, there are two other options you should be at least vaguely aware of:CFDictionary(the same thing asNSDictionaryunder the hood, but it lets you store arbitrary pointers or pointer-sized integers) andNSMapTable.在这种情况下，使用 NSNumber 似乎是最好的主意。
对于更困难的情况，您始终可以使用 NSValue 或 NSData 将任何类型或指针放入可存储在 Cocoa 集合中的 Objective-C 对象中。
In this case, using NSNumber seems like the best idea.
For harder cases, you can always use NSValue or NSData to put any type or pointer into a Objective-C object that can be stored in Cocoa collections.