How to call Dll method from JSNI to use in GWT web application?

Question

I have a GWT web application.

It calls method from another class(using JSNI method).

But I want to Call a dll method from that class...How can i do that?

public class external_class {
public native void shows()/*-{window.alert("hello");}-*/;
}

in GWT web application calling like

external_class obj = new external_class();
            obj.shows();

how can I invoke shows() method if I defined it in a dll file? or how can i directly call a dll method from GWT application through JSNI?

please give me a solution....

Answer 1

You can not call a DLLs in GWT. GWT compiles Java code to Javascript code which runs inside a webbrowser. Javascript can not call DLLs directly, if you want to do something with a DLL I suggest you take a look into browser plugins.

In browser plugins you can include your dll (only windows) and have your javascript call that plugin.

Answer 2

To me it looks like you need to use an Applet and jnlp to load the native libraries in. From there you can communicate between GWT and the applet using the JSObject or a library like GWT-AI (personally I just code this by hand, I have only used GWT-AI a few times). I believe for the applet side you could use JNA for your bindings.

If this doesn't make sense, or sounds a bit like gibberish, you may need to enlist help, a lot can go wrong bringing between java and native libraries, and you may need more specialized help to actually make progress on this, it's tricky.