Objective C - Defining macro to call a method?

Question

I want to define a macro to call the following, Is this possible? I also want it to accept format string.

- (void)logString:(NSString *)string withLogLogLevel:(LogLevel)logLevel
{
   // Sav log to file
}

DLog("text");
[Logger logString:text withLogLevel:LogLevelDebug];

ILog("text");
[Logger logString:text withLogLevel:LogLevelInfo];

ELog("text");
[Logger logString:text withLogLevel:LogLevelInfo];

I want to define a macro that calls a method with required parameters — aryaxt
– aryaxt, Commented Dec 13, 2012 at 21:38
While it's pretty easy to do what you've asked (see @dasblinkenlight's answer for a very simple approach), the logging problem is somewhat complex to do well, and there are good pre-built solutions to take care of this for you. See github.com/robbiehanson/CocoaLumberjack for a good example. — Rob Napier
– Rob Napier, Commented Dec 13, 2012 at 21:43

Sergey Kalinichenko · Accepted Answer · 2012-12-13 21:44:19Z

10

Assuming that logString:withLogLevel: takes a single string parameter in addition to the log level, this should be possible:

#define DLog(x) [Logger logString:(x) withLogLevel:LogLevelDebug]

Note the parentheses around the macro parameter, it is useful when macros are called with composite expressions.

Assuming that the logger takes NSString objects, not C string, you should use the macro like this:

DLog(@"Text");

However, in this case it is not clear why would one prefer a macro to a simple function call:

void DLog(NSString *str) {
    [Logger logString:str withLogLevel:LogLevelDebug];
}

edited Dec 13, 2012 at 21:44

answered Dec 13, 2012 at 21:39

Sergey Kalinichenko

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1 Comment

user529758 Over a year ago

__VA_ARGS__ are worth mentioning, IMHO.

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