Print out the variable name objective-C

Question

Continued from the last question here: Log method name in Obj-C . I just wondered if there is a way to print out the variable name as well. For example:

NSString *name = "vodkhang";
NCLog(@"%@", name);

and I hope that the output should be:

name: vodkhang

Just to summarize the previous post, currently, I can print out the class name, method name and the line number when I call

NCLog(@"Hello World");
<ApplicationDelegate:applicationDidFinishLaunching:10>Hello world

with

#define NCLog(s, ...) NSLog(@"<%@:%d> %@", __FUNCTION__, __LINE__, [NSString stringWithFormat:(s), ##__VA_ARGS__])

vodkhang · Accepted Answer · 2010-07-22 14:17:49Z

36

#define logIntVariable(x) NSLog( @"Value of %s = %d",#x, x)


- (void) myRoutine {
   int intValue = 5;

   logIntVariable(intValue);
}

edited Jul 22, 2010 at 14:17

vodkhang

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answered May 12, 2010 at 12:06

gnasher

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1 Comment

Quinn Taylor Over a year ago

The general principle is that when you put a # in front of an argument within the body of a #define, the preprocessor replaces it with a C string of the exact expression passed to the macro. When you pass a variable name, you'll get that name. If you pass an expression, it will reproduce the expression in full, not the evaluated result.

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