1 void exportString() 2 { 3     NSString *str = @"Hello, 坑爹"; 4     NSString *path = @"/Users/hellovoidworld/Study/Foundation/NSString/abc.txt"; 5     NSError *error; 6     7     [str writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:&error]; 8     9     if(nil == error)10     {11         NSLog(@"Write successfully");12     }13     else14     {15         NSLog(@"Write fail: %@", error);16     }17 }18 19 int main(int argc, const char * argv[]) {20     @autoreleasepool {21         exportString();22     }23     return 0;24 }