How to obtain a new Pointer in Java?

Question

How can I call a method with this method signature in C from JNA?

int open_device(context *ctx, device **dev, int index);

The last two line

Answer 1

Even better answer. You may want to allocate (malloc etc) depending upon Java String length. Example below is unit test from JNA project.

public void testGetSetStringWithDefaultEncoding() throws Exception {
    final String ENCODING = Native.DEFAULT_ENCODING;
    String VALUE = getName();
    int size = VALUE.getBytes(ENCODING).length+1;
    Memory m = new Memory(size);
    m.setString(0, VALUE);
    assertEquals("Wrong decoded value", VALUE, m.getString(0));
}