Question

I need to concatenate a NSString with the NSString output of NSDateFormatter. My code is below.
Please check where I am going wrong. I have to concatenate DEST PATH with datestring.

NSDateFormatter * formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"dd-MM-yyyy HH-mm"];

NSString * dateString = [formatter stringFromDate:[NSDate date]];

NSString *DEST_PATH=[NSHomeDirectory() stringByAppendingString:@"/Documents/Movie1];

// below is for concatenate

result =[result stringByAppendingString:DEST_PATH];
result=[result stringByAppendingString:dateString]; 

Answer 1

It appears as though you never instantiate the NSString result. I would change the above to the following:

NSDateFormatter * formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"dd-MM-yyyy HH-mm"];
NSString * dateString = [formatter stringFromDate:[NSDate date]];

NSString *DEST_PATH=[NSHomeDirectory() stringByAppendingString:@"/Documents/Movie1];
NSString* result=[DEST_PATH stringByAppendingPathComponent:dateString];

If you use the stringByAppendingPathComponent method it will automatically add the slash for you.

Also, using all capital letters for identifiers usually denotes a c style propocessor macro constant, so using it as a variable may confuse some people.