Problems with Random numbers

[BenODwyer]

Hi All

This is a bit of a noob question as I am new to Objective C, Cocoa and the iPhone SDK.

The outcome of this is to load a movie file. I want it to pick a movie at random from several named movie0.m4v to movie3.m4v

I generated a random number using:

int r = arc4random() % 4;

Then I use "r" to append to the movie name like this:

NSString *moviePath = [bundle pathForResource:@"movie"+r ofType:@"m4v"];

This doesn't work..

If I remove the reference to "r". Then rename one of my movies to "movie.m4v" it works a treat.

Can anyone shed some light on this for me.

Will be much appreciated.

Thanks.

[exorcyze]

[NSString stringWithFormat:@"movie%i", r]

=)

[lajos]

You are generating the random number correctly.

However this line is bogus:

NSString *moviePath = [bundle pathForResource:@"movie"+r ofType:@"m4v"];

You could do something like:

NSString *movieName = [NSString stringWithFormat:@"movie%d.m4v",r];
NSString *moviePath = [bundle pathForResource:movieName];

[rames44]

I'm guessing you're a Java programmer?

"Adding" integers and strings doesn't work in Objective C the way it does in Java (where the integer gets converted to a string, and then the "+" means "append")

You'll need something more like:

NSString* movieName = [NSString stringWithFormat:@"movie%d", r];
NSString *moviePath = [bundle pathForResource:movieName ofType:@"m4v"];

[BenODwyer]

Thanks alot, that has sorted my issue.

It is amazing how different Objective C is. I can see this is going to be a steep leaning curve!

Thanks again.

[lajos]

It's not that bad. Just read the manuals...

[wuf810]

Originally Posted by BenODwyer

Thanks alot, that has sorted my issue.

It is amazing how different Objective C is. I can see this is going to be a steep leaning curve!

Don't worry you'll be surprised how quickly you'll get the hang of it.