Re: [xmlvm-dev] [xmlvm-users] error when intializing variables

[Panayotis K. <pan...@pa...>]

What do you think about the solution for this specific problem?

Use the following code for the selector applicationDidFinishLaunching of UIApplicationDelegate


- (void) applicationDidFinishLaunching: (UIApplication*) app
{
    SEL selector = NSSelectorFromString([NSString stringWithFormat:@"__init_%s__", class_getName([self class])]);
    [self performSelector:selector];
    
    [self applicationDidFinishLaunching___org_xmlvm_iphone_UIApplication: app];
}

As a side note, probably we should do the same for the UIApplication object as well (if it is an instance of  org_xmlvm_iphone_UIApplication)




On 11 Νοε 2010, at 6:56 μ.μ., Arno Puder wrote:

> 
> that is a known issue. The code that XMLVM generates is correct. The 
> problem is that certain classes (such as UIAppication*) are instantiated 
> by Cocoa and Cocoa doesn't know about the __init__*() constructors that 
> were generated by XMLVM. The initialization of 'test' in your example 
> will end up in the default constructor for class Main and since Cocoa 
> doesn't call it, it won't get initialized.
> 
> This will work perfectly fine for any other class (that is handled by 
> XMLVM). It is just this special case when Cocoa instantiates a Java 
> object. Back then I couldn't think of a solution for this. I'll revisit 
> this with the C backend. Here we might have more hooks to solve this 
> problem.
> 
> Arno
> 
> 
> On 11/11/10 7:08 AM, Panayotis Katsaloulis wrote:
>> there is something missing when variables are initialized outsize the constructor.
>> 
>> As a minium program to display this error, have a look at this: instead of printing "hello", it prints "null", since this is not initialized.
>> 
>> 
>> 
>> 
>> package my.testmem;
>> 
>> import org.xmlvm.iphone.UIApplication;
>> import org.xmlvm.iphone.UIApplicationDelegate;
>> 
>> public class Main extends UIApplicationDelegate {
>> 
>>     String test = "hello";
>> 
>>     @Override
>>     public void applicationDidFinishLaunching(UIApplication app) {
>>         System.out.println(test);
>>     }
>> 
>>     public static void main(String[] args) {
>>         UIApplication.main(args, null, Main.class);
>>     }
>> }