Java JNA Objective-C（洛可可）日历回调

我想通过洛可可访问Java中的Objective-C EKEventStore。API指定了在用户接受日历访问提示时获得通知的方法，这在纯Objective-C中非常有效

    Native.loadLibrary("EventKit", EventKitLibrary.class);

    EKEventStore store = EKEventStore.CLASS.alloc();
    store.init();
    //store = store.initWithAccessToEntityTypes(EKEntityType.EKEntityTypeEvent); // no notification
    EKEventStoreRequestAccessCompletionHandler handler = new EKEventStoreRequestAccessCompletionHandler() {
        @Override
        public void invoke(boolean granted, Pointer error) {
            System.out.println("Access: " + granted);
            NSArray calArray = store.calendarsForEntityType(EKEntityType.EKEntityTypeEvent);
            for (int i = 0; i < calArray.count(); i++) {
                NSObject calObject = calArray.objectAtIndex(i);
                EKCalendar osxcal = Rococoa.cast(calObject, EKCalendar.class);
                System.out.println(osxcal.title().toString());
            }
        }

    };
    ObjCObject object = Rococoa.proxy(handler); // get Objective C Callback Object to send
    store.requestAccessToEntityType_completion(EKEntityType.EKEntityTypeEvent, object.id());

    try {
        Thread.sleep(10000); // wait for the access prompt
    } catch (InterruptedException ex) {
    }

    // random object access to save instances from gc
    System.out.println(handler.toString());
    System.out.println(store.id());
    System.out.println(object.id());

映射类

public abstract class EKEventStore extends NSObject {

    public static final _Class CLASS = Rococoa.createClass("EKEventStore", _Class.class);

    public interface _Class extends ObjCClass {

        public abstract EKEventStore alloc();
    }

    public static interface EKEntityType {

        public static final int EKEntityTypeEvent = 0;
        public static final int EKEntityTypeReminder = 1;
    };

    public static interface EKEntityMask {

        public static final int EKEntityMaskEvent = (1 << EKEntityType.EKEntityTypeEvent);
        public static final int EKEntityMaskReminder = (1 << EKEntityType.EKEntityTypeReminder);
    };

    public abstract EKEventStore initWithAccessToEntityTypes(int EKEntityMask);

    public abstract EKEventStore init();

    public abstract void requestAccessToEntityType_completion(int EKEntityType, ID handler);

    interface EKEventStoreRequestAccessCompletionHandler {

        void invoke(boolean granted, Pointer error);
    }

    public abstract NSArray calendarsForEntityType(int EKEntityType);
}


public abstract class EKCalendar extends NSObject {

    public static final _Class CLASS = Rococoa.createClass("EKCalendar", _Class.class);

    public static interface _Class extends ObjCClass {

        public NSObject alloc();
    }

    public abstract NSString title();
}

公共抽象类EKEventStore扩展了NSObject{
公共静态最终类=Rococoa.createClass（“EKEventStore”，类）；
公共接口_类扩展了objcc类{
公共抽象EKEventStore alloc（）；
}
公共静态接口eEntityType{
公共静态最终int eEntityTypeEvent=0；
公共静态最终int eEntityTypeReminder=1；
};
公共静态接口eEntityTask{
public static final int EKEntityMaskEvent=（1通常，
TypeMapper
是这样实现的，它将
指针
本机类型转换为其他Java类型：

class NSErrorTypeMapper extends DefaultTypeMapper {
    public NSErrorTypeMapper() {
        TypeConverter tc = new TypeConverter() {
            public Object toNative(Object value, ToNativeContext ctxt) {
                Pointer p = // convert your NSError "value" into a Pointer
                return p;
            }
            public Object fromNative(Object value, FromNativeContext ctxt) {
                Pointer p = (Pointer)value;
                Object object = // convert the pointer into an NSError object
                return object;    
            }
            public class nativeType() {
                return Pointer.class;
            }
        };
        addToNativeConverter(NSError.class, tc);
        addFromNativeConverter(NSError.class, tc);
    }
}

如果洛可可没有提供
指针
->
NSError
类型映射器，您当然可以使用
指针
作为参数类型，这至少可以让您成功执行回调，之后您可以研究处理
NSError
类型的最佳方式。可能从
指针
到
NSError
的正确转换。我以前也尝试过，但我在pc=0x00007fff8361c064，pid=19097，tid=5379，C[libobjc.a.dylib+0x9064]objc\u retain+0x14得到了一个JVM致命错误#SIGSEGV（0xb）:si\u signo:11（SIGSEGV），si\u代码：0（未知），si_addr:0x000000000000使用这些结果更新您的问题，并准确描述您尝试的内容。好的，指针现在工作正常，函数调用正确，但回调函数从未执行
class NSErrorTypeMapper extends DefaultTypeMapper {
    public NSErrorTypeMapper() {
        TypeConverter tc = new TypeConverter() {
            public Object toNative(Object value, ToNativeContext ctxt) {
                Pointer p = // convert your NSError "value" into a Pointer
                return p;
            }
            public Object fromNative(Object value, FromNativeContext ctxt) {
                Pointer p = (Pointer)value;
                Object object = // convert the pointer into an NSError object
                return object;    
            }
            public class nativeType() {
                return Pointer.class;
            }
        };
        addToNativeConverter(NSError.class, tc);
        addFromNativeConverter(NSError.class, tc);
    }
}