Re: questions
Re: questions
- Subject: Re: questions
- From: Ondra Cada <email@hidden>
- Date: Mon, 13 Aug 2001 20:54:21 +0200
Farl,
sorry, I'm not that familiar with NSURLs. Otherwise:
>
>>>>> Farl (F) wrote at Mon, 13 Aug 2001 11:30:23 -0700:
F> 2.
F> I want to build in a set of hash tables for key values. Namely the hash
F> set of error codes to error names (as in above). Now I think the way to do
F> this is using NSMutableDictionary.
Right.
F> experience, and the absolute stupidity of how Apple sets out its developer
F> docs, it lists the commands, but simply fails to give some simple examples
F> of how to actually use it in a real way. Any simple example code of this
F> would be great.
I guess there would be something in the Examples. But, you can go like
NSMutableDictionary *dict...;
// store pair 3333, "strange value"
[dict setObject:@"strange value" forKey:[NSNumber numberWithInt:3333]];
// get the value for key 3333
NSString *val=[dict objectForKey:[NSNumber numberWithInt:3333]];
Enough?
(Digression: if you want to be able to enter the values using something like
dict=[NSMutableDictionary dictionaryWithObjectsAndKeys:@"strange
code",@"3333",nil];
you can encode the numbers using [NSString stringWithFormat:@"%d",n]. It is
somewhat less efficient, but in your case the difference would be
negligible).
F> 3.
F> I want to load the set of hash tables (see above) when the program loads.
F> Normally in c++ i would just stick all of it in a procedure that ran first
F> under int main();. However, I cannot see where to do this in osX's cocoa
F> layout. I need these hash tables to load up when the program does, not
F> everytime the "go" button is pressed in my program.
See the NSApplication.html, especially the applicationDidFinishLaunching:
delegate message.
Another nice possibility is to check whether the variable was inited already:
if (!dict) dict=[[NSMutableDictionary alloc] initWithContentsOfFile:...];
F> 4.
F> And lastly, with NSString, is there a limit to how long a NSString can be?
There is not (but the address space / free disk space size ;)
---
Ondra Cada
OCSoftware: email@hidden
http://www.ocs.cz
private email@hidden
http://www.ocs.cz/oc
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