How to use if else in macro(define)?

Question

I should separate Live and Dev URL. So, I write this code

#define _APP_MODE @"real"

#if APP_MODE == dev
#define _BASE_URL @"http://devmall.aaa.com/m/app/"
#define _URL_FROM_SAFARI @"http://devmall.safari.com"
#else
#define _BASE_URL @"http://m.aaa.com/m/app/"
#define _URL_FROM_SAFARI @"http://m.safari.com"

but it always return dev_url

What is the best way to make sure that the URL is separated by APP_MODE?

score 1 · Accepted Answer · answered Jul 04 '17 at 08:13

strings dont work in objC preprocessor AFAIK

... see also how to compare string in C conditional preprocessor-directives

what I'd do (and is common) is using integers

#import <Foundation/Foundation.h>

#define DEV 0
#define REAL 1

#define APP_MODE REAL

#if APP_MODE == DEV
#define BASE_URL @"http://devmall.aaa.com/m/app/"
#define URL_FROM_SAFARI @"http://devmall.safari.com"
#else
#define BASE_URL @"http://m.aaa.com/m/app/"
#define URL_FROM_SAFARI @"http://m.safari.com"
#endif

int main(int argc, char *argv[]) {
    @autoreleasepool {
        NSLog(BASE_URL);
    }
}

note: loose all the weird underscores :)) [if you can]

you cant - it is a compiler check – Daij-Djan Mar 23 '18 at 17:24 — Daij-Djan, Mar 23 '18 at 17:24

How to use if else in macro(define)?

1 Answers1