Objective-C xcode：相当于 C/C++ 中的 __FILE__ 和 __LINE__？
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Objective-C xcode: Equivalent of __FILE__ and __LINE__ from C/C++?
提问by MikeN
Same question as: Do __LINE__ __FILE__ equivalents exist in C#?
与以下相同的问题：C# 中是否存在 __LINE__ __FILE__ 等效项？
But for Objective-C in iPad/iPhone SDK Xcode? This would really help my NSLog statement be a lot more readable over time.
但是对于 iPad/iPhone SDK Xcode 中的 Objective-C？随着时间的推移，这真的有助于我的 NSLog 语句更具可读性。
回答by iSavaDevRU
So even easier visually. Displays only the file name without a path. It is convenient to observe the terminal without text wrapping.
所以在视觉上更容易。只显示没有路径的文件名。方便观察终端，无需换行。
Writing:
写作：
NSLog(@"Log: %s %d", (strrchr(__FILE__, '/') ?: __FILE__ - 1) + 1, __LINE__);
Output is:
输出是：
Log: file.m 340
回答by Georg Fritzsche
Yes, they do:
是的，他们这样做：
NSLog(@"%s:%d", __FILE__, __LINE__);
Output is e.g.:
输出是例如：
/Path/to/file.m:42
/Path/to/file.m:42
回答by Brian Westphal
You can also simply use @__FILE__
您也可以简单地使用 @__FILE__
回答by D.Shawley
I would have to go back and look at the Objective C documentation, but my guess would be "most certainly"since these are core to the C Programming Language and Objective C is an extension of it.
我将不得不回去查看 Objective C 文档，但我的猜测是“最肯定的”，因为这些是 C 编程语言的核心，而 Objective C 是它的扩展。
回答by Dan
Note that you cannot implicitly cast the string constant returned by FILEto a char *.
请注意，您不能将FILE返回的字符串常量隐式转换为 char *。
This throws up a compiler warning. "Deprecated conversion from string constant to 'char *'".
这会引发编译器警告。“已弃用从字符串常量到 'char *' 的转换”。
The above should read:
以上应为：
NSLog(@"%s:%d", (char *) __FILE__, __LINE__);
