CODEWITHSUNDEEP
objective-cxcode
Curnelious
Curnelious

Reputation: 1

calling a function

Hi i have a function on a class which is like this :

- (Float32)averagePower {   
    if (![self isListening])
        return 0.0;
    float tmp = [self levels][0].mAveragePower;
    tmp = tmp * 100;
    NSLog(@"%f",  tmp);
    return tmp;
}

i am calling it from viewdidload of another class like this:

SoundSensor *theInstance = [[SoundSensor alloc] init];
    [theInstance listen];
    Float32 tmp;
    [theInstance averagePower:tmp];

now i can call to listen but when calling to averagepower i got warning that it may not respond and the function is crashing in simulation. what i do wrong ?

thanks a lot.

Upvotes: 0

Views: 167

Answers (2)

albertamg
albertamg

Reputation: 28572

You are calling the method with a parameter:

 [theInstance averagePower:tmp];

but it does not have any parameters in its definition:

- (Float32)averagePower {
// ...
}

This is causing the crash. If you are trying to assign the return value of the method to the tmp variable, you should do this:

Float32 tmp = [theInstance averagePower];

To get rid of the warning make sure you declare this method in the interface block of the corresponding class (the h file).

Upvotes: 3

badgerr
badgerr

Reputation: 7982

You are trying to pass a variable to a function that accepts no parameters.

What I expect you meant to do is this:

Float32 tmp = [theInstance averagePower];

Upvotes: 1

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