It would be handy to have the .jar file to test against (or something with the
same API). That said..
On Feb 3, 2012, at 1:51 PM, digitalml wrote:
> I used your code to call the jni_helper and initialize the reader; however,
> the manged wrapper for the onReceiveMsgCardData() is never called.
Are you calling InitializeReader()? I'm sure you are, but it doesn't hurt to
check...
> I can't figure out how to get the .net delegate to fire when the java version
> of onReceiveMsgCardData() fires.
Before n_OnReceiveMsgCardData() is invoked, Get_onReceiveMsgCardData_Handler()
will be invoked, and Get_onReceiveMsgCardData_Handler() will only be invoked if:
1. There's an android callable wrapper which registers the
onReceiveMsgCardData() method; the `MyJniHelper` class should do so.
2. The android callable wrapper instance is created. The android callable
wrapper static constructor is responsible for registering the methods, so if
you never instantiate a e.g. `MyJniHelper` instance, then the method will never
be registered (and the method would never be invoked, as there's no instance to
invoke it on).
Thus, at minimum your code will need to do:
var h = new MyJniHelper();
h.InitializeReader();
I would also suggest putting a trace into Get_onReceiveMsgCardData_Handler() to
see if it's being invoked.
> static IntPtr id_InitializeReader;
> public void InitializeReader(Activity act)
> {
> try
> {
> if (id_InitializeReader == IntPtr.Zero)
> id_InitializeReader = JNIEnv.GetMethodID(class_ref,
> "InitializeReader", "(Landroid/app/Activity;)V");
> JNIEnv.CallVoidMethod(Handle, id_InitializeReader, new
> JValue(act));
> }
> catch (Exception ex)
> {
> string err = ex.StackTrace;
> }
> }
1. Why are you wrapping InitializeReader() in a try/catch?
2. Why are you swallowing the exception?
If this throws, you want to know about it. :-)
The same is true for SwipeCard() -- in general, exceptions are exceptional; you
want to know when they happen (and having the app die is a good way of knowing,
at least during development), so that you can fix them.
Thanks,
- Jon
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