One of these days we'll get the JNI doc published which discusses many of these
issues.
In the meantime...
On Jan 10, 2012, at 4:58 AM, Tomasz Cielecki wrote:
> My guess it has something to do with my implementation of my GetNotifyHandler.
Not GetNotifyHandler(), but n_Notify():
> static void n_Notify(IntPtr jnienv, IntPtr lrefThis, String a)
What's going on is a "reverse P/Invoke": you're creating a delegate
(`cb_notify`), which is passed to native code (Dalvik), and the delegate is
invoked. This means that you need to stick to types that the P/Invoke marshaler
knows about.
In this case, the P/Invoke marshaler will see a `string` parameter, assume that
it's a UTF-8 `const char*` value, and behaves accordingly. However, that's not
what the parameter will be, it'll be a java.lang.String instance, which the
P/Invoke marshaler knows nothing about.
The solution is to manually marshal things:
static void n_Notify(IntPtr jnienv, IntPtr lrefThis, IntPtr native_a)
{
ManagedAccessControlJavascriptNotify __this =
Java.Lang.Object.GetObject<ManagedAccessControlJavascriptNotify>(
lrefThis, JniHandleOwnership.DoNotTransfer);
Java.Lang.String a =
Java.Lang.Object.GetObject<Java.Lang.String>(
a, JniHandleOwnership.DoNotTransfer);
__this.Notify (a);
}
> What happens if the Javascript interface wants to pass a Java.Lang.String to
> the managed code and the Action there has the type System.String.
Convert the Java.Lang.String to a System.String by using
Java.Lang.String.ToString(). :-)
- Jon
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