NSLog on .mm file

How do I print out something to the debugger console if the file is of .mm extension?

I开发者_运维百科 tried NSLog and printf but none shows anything on the debugger console.

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NSLog works just fine in .mm files, as well as printf. Even std::cout << "foo"; works great in .mm files because the extension marks the files as Objective-C++ file so you can mix C, C++ and ObjC in there.

If it doesn't print anything out, make sure that the program really reaches the point where you set the NSLog, you can place a few break points for this and then single step through your program.

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Your problem has nothing to do with the type of the compilation unit (".mm" for Objective-C++ or ".m" for pure Objective-C). NSLog as well as printf work in both languages.

Your problem is elsewhere.

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Try importing <Foundation/Foundation.h>

Add this line in the top of your class, this might help.

#import <Foundation/Foundation.h>