Bug 1522 - Getting a Byte[] from a Java.Lang.Object fails using JNIEnv.GetArray<Byte>(intptr)
Summary: Getting a Byte[] from a Java.Lang.Object fails using JNIEnv.GetArray<Byte>(in...
Alias: None
Product: Android
Classification: Xamarin
Component: BCL Class Libraries ()
Version: 1.0
Hardware: Macintosh Mac OS
: --- enhancement
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2011-10-16 17:26 UTC by Chris Hardy [MSFT]
Modified: 2011-11-04 10:14 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Chris Hardy [MSFT] 2011-10-16 17:26:19 UTC
var bytes = JNIEnv.GetArray<Byte>(castedPdus[i].Handle); 
fails with this error - https://gist.github.com/ae1d7a1723a9d1376c74 - where castedPdus is a object[].

where the workaround of

var bytes = new Byte[JNIEnv.GetArrayLength(castedPdus[i].Handle)];
JNIEnv.CopyArray(castedPdus[i].Handle, bytes);

is successful.

The following is a sample Broadcast Receiver to hit this error:

Comment 1 Chris Hardy [MSFT] 2011-11-02 11:27:09 UTC
To get the broadcast to run,

Telnet into the emulator;

telnet localhost 5554

then send SMS commands like the following;

sms send 123456789 my message goes here

I hope this helps,

Comment 2 Jonathan Pryor 2011-11-02 11:33:04 UTC
`ddms` can also be used, by selecting the device in the left tre view, selecting the Emulator Control tab in the right pane, and using the Telephony Actions section.
Comment 3 Jonathan Pryor 2011-11-02 11:36:58 UTC
The app also needs the android.permission.RECEIVE_SMS permission in order to receive the SMS.
Comment 4 Jonathan Pryor 2011-11-03 10:04:50 UTC
The "Fails" line in the gist is fixed in 46fe19e0, allowing this to work:

    var bytes = JNIEnv.GetArray<Byte>(castedPdus[i].Handle);
Comment 5 Jonathan Pryor 2011-11-04 10:14:45 UTC
Fixed in 3cde304a, allowing OnReceive() to make great use of LINQ (while being somewhat similar to the Java code):

    public override void OnReceive(Context context, Intent intent)
      if (intent.Action == INTENT_ACTION) {
        Bundle bundle = intent.Extras;

        if (bundle != null) {
          var pdus = (Java.Lang.Object[]) bundle.Get ("pdus");

          var msgs = pdus.Select (pdu => SmsMessage.CreateFromPdu ((byte[]) pdu)).ToArray ();
          var str  = string.Join ("\n",
              msgs.Select (msg => "SMS from: " + msg.OriginatingAddress + ": " +
                msg.MessageBody.ToString ()));

          Toast.MakeText(context, str, ToastLength.Short).Show();