Examples of jnr.ffi.Address

jnr.ffi.Address
The {@code Address} class wraps a native address in an object. Both 32 bit and 64bit native address values are wrapped in a singular {@code Address} type.
This class extends {@link java.lang.Number} and implements all {@code Number} methods forconverting to primitive integer types.
An {@code Address} instance is lighter weight than most {@link Pointer}instances, and may be used when a native address needs to be stored in java, but no other operations (such as reading/writing values) need be performed on the native memory. For most cases, a {@link Pointer} offers more flexibilityand should be preferred instead.

        void ptr_set_pointer(@Out AddressByReference p, int offset, Address value);
    }
    
    @Test public void inOnlyReferenceSet() {
        TestLibInOnly lib = TstUtil.loadTestLib(TestLibInOnly.class);
        final Address MAGIC = Address.valueOf(0xdeadbeef);
        AddressByReference ref = new AddressByReference(MAGIC);
        assertEquals("Wrong value passed", MAGIC, lib.ptr_ret_pointer(ref, 0));
    }

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        assertEquals("Wrong value passed", MAGIC, lib.ptr_ret_pointer(ref, 0));
    }


    @Test public void inOnlyIntReferenceNotWritten() {
        TestLibInOnly lib = TstUtil.loadTestLib(TestLibInOnly.class);
        final Address MAGIC = Address.valueOf(0xdeadbeefL);
        AddressByReference ref = new AddressByReference(MAGIC);
        lib.ptr_set_pointer(ref, 0, Address.valueOf(0));
        assertEquals("Int reference written when it should not be", MAGIC, ref.getValue());
    }

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        assertEquals("Int reference written when it should not be", MAGIC, ref.getValue());
    }


    @Test public void outOnlyIntReferenceNotRead() {
        TestLibOutOnly lib = TstUtil.loadTestLib(TestLibOutOnly.class);
        final Address MAGIC = Address.valueOf(0xdeadbeef);
        AddressByReference ref = new AddressByReference(MAGIC);
        assertTrue("Reference value passed to native code when it should not be", !MAGIC.equals(lib.ptr_ret_pointer(ref, 0)));
    }

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        assertTrue("Reference value passed to native code when it should not be", !MAGIC.equals(lib.ptr_ret_pointer(ref, 0)));
    }


    @Test public void outOnlyIntReferenceGet() {
        TestLibOutOnly lib = TstUtil.loadTestLib(TestLibOutOnly.class);
        final Address MAGIC = Address.valueOf(0xdeadbeef);
        AddressByReference ref = new AddressByReference(Address.valueOf(0));
        lib.ptr_set_pointer(ref, 0, MAGIC);
        assertEquals("Reference value not set", MAGIC, ref.getValue());
    }

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Related Classes of jnr.ffi.Address

jnr.ffi.byref.AddressByReferenceTest

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