Thank you guys for your assistance. I come from a C++ background and
have done embedded design in ASM. But this way of working and
particularly the framework is very new to me. I understand what you are
saying, but the literature I am reading is very disappointingly. I have
solved the issue with the strings soon after I wrote the message but
just for completeness and for the sake of a decent critique I will post
the new code. I love the term you are flailing around here, thats
exactly how I felt until I discovered where I was going wrong. Thanks
Graham and Stephen for your replies and comments.
Graham I believe you asked what does "//does not work" mean. I think the
compiler was giving me a function returns void and should be handled as
such. Basically, function returns nothing.
This line of code seems to work for exactly what I was looking for:
temp = [[temp stringByAppendingFormat:@" %@ %@ \n", input1, input2]
retain];
although I have to admit I am unsure really what the "retain" will
actually do here with respect to memory. The the preceding [temp
autorelease] create a memory leak or is this the correct way to handle
memory management within the framework?
-----------------------------------
<code>
#import <Foundation/Foundation.h>
@interface Calculator : NSObject
{
double accumulator;
NSString* caption;
NSString* name;
NSString* temp;
}
- (id) init;
- (void) setAccumulator:(double) n;
- (void) printAccumulator;
- (NSString*) caption;
- (NSString*) name;
- (NSString*) temp;
- (void) setCaption: (NSString*)input;
- (void) setName: (NSString*)input;
- (void) setTempString: (NSString*)input;
- (void) combineString: (NSString*) input1 : (NSString*) input2;
- (void) printCaption;
- (void) printName;
- (void) printTemp;
@end
@implementation Calculator
- (id) init
{
if ( self = [super init] )
{
[self setAccumulator:0];
[self setCaption:@"Default Caption"];
[self setName:@"Default Name"];
[self setTempString:@"empty"];
}
return self;
}
- (void) setAccumulator: (double) n
{
accumulator = n;
}
- (void) printAccumulator
{
NSLog(@"Accumulator = %f", accumulator);
}
- (NSString*) caption {
return caption;
}
- (NSString*) name {
return name;
}
- (NSString*) temp {
return temp;
}
- (void) setCaption: (NSString*)input
{
[caption autorelease];
caption = [input retain];
}
- (void) setName: (NSString*)input
{
[name autorelease];
name = [input retain];
}
- (void) setTempString: (NSString*)input
{
[temp autorelease];
temp = [input retain];
}
- (void) combineString: (NSString*) input1 : (NSString*) input2
{
[temp autorelease];
temp = @"";
temp = [[temp stringByAppendingFormat:@" %@ %@ \n", input1, input2]
retain];
}
- (void) printCaption
{
NSLog(@"%@ \n", self.caption);
}
- (void) printName;
{
NSLog(@"%@ \n", self.name);
}
- (void) printTemp;
{
NSLog(@"%@ \n", self.temp);
}
@end
int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
// insert code here...
Calculator *theDevice = [[Calculator alloc] init];
[theDevice init];
[theDevice printAccumulator];
[theDevice setAccumulator:10];
[theDevice printAccumulator];
[theDevice setName: @"Brian D"];
[theDevice setCaption: @"Rocks"];
[theDevice combineString:[theDevice name] : [theDevice caption]];
[theDevice printTemp];
[theDevice printName];
[theDevice printCaption];
NSLog(@"The two variables: %@, %@ \n", [theDevice name], [theDevice
caption]);
NSLog(@"Hello, World!");
[theDevice release];
[pool drain];
return 0;
}
</code>
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