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POTrouble with NSString: using a controller to set an NSTextField?
 

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  1. POTrouble with NSString: using a controller to set an NSTextField?
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    <p>I am using Xcode 4 writing a simple program to generate text based on user input. Im reading from two text fields successfully, but I am unable to send the result to a separate NSTextField. I'm confident I've made all the right connections in IB, and I'm sending the NSTextField the setStringValue method. I have created a ScaleGenerator object that I believe may be improperly creating the string itself. My Controller header looks like this:</p> <pre><code>#import &lt;Cocoa/Cocoa.h&gt; @interface Controller : NSObject { IBOutlet NSTextField * notesField; IBOutlet NSTextField * midiField; IBOutlet NSTextField * resultField; IBOutlet id scalegenerator; } - (IBAction) generate: (id) sender; @end // Controller </code></pre> <p>The Controller implementation looks like this:</p> <pre><code>#import "Controller.h" #import "ScaleGenerator.h" #import &lt;Foundation/foundation.h&gt; @implementation Controller - (IBAction) generate: (id) sender { int midinote; int notes; NSString * scale; midinote = [midiField intValue]; if(midinote &lt; 0 || midinote &gt; 127) { NSRunAlertPanel(@"Bad MIDI", @"That MIDI note is out of range! (0 - 127)", @"OK", nil, nil); return; } notes = [notesField intValue]; if(notes &lt; 2 || notes &gt; 24) { NSRunAlertPanel(@"Bad Scale Size", @"You must have at least two notes in your scale, and no more than 25 notes!", @"OK", nil, nil); return; } scale = [scalegenerator generateScale: midinote and: notes]; [resultField setStringValue:scale]; } @end </code></pre> <p>My ScaleGenerator code looks like this:</p> <pre><code>#import "ScaleGenerator.h" #import &lt;math.h&gt; @implementation ScaleGenerator - (NSMutableString *) generateScale: (int) midinote and: (int) numberOfNotes { double frequency, ratio; double c0, c5; double intervals[24]; int i; NSMutableString * result; /* calculate standard semitone ratio in order to map the midinotes */ ratio = pow(2.0, 1/12.0); // Frequency Mulitplier for one half-step c5 = 220.0 * pow(ratio, 3); // Middle C is three semitones above A220 c0 = c5 * pow(0.5, 5); // Lowest MIDI note is 5 octaves below middle C frequency = c0 * pow(ratio, midinote); // the first frequency is based off of my midinote /* calculate ratio from notes and fill the frequency array */ ratio = pow(2.0, 1/numberOfNotes); for(i = 0; i &lt; numberOfNotes; i++) { intervals[i] = frequency; frequency *= ratio; } for(i = 0; i &lt; n; i++){ [result appendFormat: @"#%d: %f", numberOfNotes + 1, intervals[i]]; } return (result); } @end // ScaleGenerator </code></pre> <p>My ScaleGenerator object has one function, which is where I believe I may be messing things up. What kind of string can I iteratively append formatted text to?? And what method do I call??</p>
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