用JNA加载多个依赖库

Question

我通常使用native.loadLibrary(...)加载一个DLL。但是我想它不是这样工作的，因为我把这个函数调用分配给了实例成员。

Answer 1

假设我有库foo和库bar。bar依赖于foo；它还依赖于baz，我们没有用JNA映射它：

public class Foo {
    public static final boolean LOADED;
    static {
        Native.register("foo");
        LOADED = true;
    }
    public static native void call_foo();
}

public class Bar {
    static {
        // Reference "Foo" so that it is loaded first
        if (Foo.LOADED) {
            System.loadLibrary("baz");
            // Or System.load("/path/to/libbaz.so")
            Native.register("bar");
        }
    }
    public static native void call_bar();
}

只有当baz既不在库加载路径上(path/ld_library_path，分别适用于windows/Linux)，也不与bar在同一目录下（仅适用于windows）时，才需要调用system.load/loadLibrary。

编辑

public interface Foo extends Library {
    Foo INSTANCE = (Foo)Native.loadLibrary("foo");
}
public interface Bar extends Library {
    // Reference Foo prior to instantiating Bar, just be sure
    // to reference the Foo class prior to creating the Bar instance
    Foo FOO = Foo.INSTANCE;
    Bar INSTANCE = (Bar)Native.loadLibrary("bar");
}