I don't know if there's a difference between *QAndroidJniEnvironment* and
*QtAndroidExtras/QAndroidJniEnvironment*.
I tried a few different things, also e.g. declaring:
const jbyte foo[] = { 0x4c, 0x6f, 0x72 ,0x65, 0x6d };
Directly to avoid the cast, but the same thing is happening. I still see:
JNI ERROR (app bug): attempt to pass an instance of java.lang.String[] as
argument 1 to int Foo.bar(byte[])
So either *jbyteArray* is simply not the right type to pass to
*callStaticMethod*, for a *byte[]* parameter type, or some magic conversion
is happening in the Qt wrapper classes.
/René
On Sat, 26 Jan 2019 at 01:01 Jason H <jh...@gmx.com> wrote:
> So I think i got that completely wrong. I'm more used to using
> androidextras. They have a nice API that cleans up for you. I gotta that's
> not an option? Maybe they JNI stuff should get it's own module separate
> from Android?
>
> > Sent: Friday, January 25, 2019 at 9:00 PM
> > From: "Jason H" <jh...@gmx.com>
> > To: "René Hansen" <ren...@gmail.com>
> > Cc: interest <interest@qt-project.org>
> > Subject: Re: [Interest] (JNI ERROR) jbytearray -> java.lang.String[] -
> What am I doing wrong here?
> >
> >
> >
> > I'm not familiar with that, jbteArray, but in attemping your challenge,
> I saw:
> >
> > qjniEnv->SetByteArrayRegion(jdata, 0, _size, reinterpret_cast<jbyte
> *>(foo));
> >
> > but saw this in the docs:
> > void Set<PrimitiveType>ArrayRegion(JNIEnv *env, ArrayType array, jsize
> start, jsize len, NativeType *buf);
> >
> >
> > is jdata your jni env?
> >
> > Sent: Friday, January 25, 2019 at 1:13 PM
> > From: "René Hansen" <ren...@gmail.com>
> > To: interest <interest@qt-project.org>
> > Subject: [Interest] (JNI ERROR) jbytearray -> java.lang.String[] - What
> am I doing wrong here?
> >
> > All I want to do is send some bytes from Qt to Java, but I'm running
> into an annoying problem, where my jbyteArray gets turned
> into java.lang.String[] in mid-flight:
> >
> >
> > E art : JNI ERROR (app bug): attempt to pass an instance of
> java.lang.String[] as argument 1 to int Foo.bar(byte[])
> > F art : art/runtime/java_vm_ext.cc:410] JNI DETECTED ERROR IN
> APPLICATION: bad arguments passed to int Foo.bar(byte[]) (see above for
> details)
> > F art : art/runtime/java_vm_ext.cc:410] from void
> org.qtproject.qt5.android.QtNative.runPendingCppRunnables()
> > F art : art/runtime/java_vm_ext.cc:410] "main" prio=5 tid=1 Runnable
> > ...
> >
> > Here's a minimal example; just a simple auto test project:
> >
> > TestJNI.pro:
> >
> >
> > QT += testlib androidextras
> > QT -= gui
> >
> > CONFIG += qt console warn_on depend_includepath testcase
> > CONFIG -= app_bundle
> >
> > TEMPLATE = app
> >
> > SOURCES += tst_test_jni.cpp
> >
> > ANDROID_PACKAGE_SOURCE_DIR = $$PWD
> >
> > DISTFILES += \
> > src/Foo.java
> >
> > tst_test_jni.cpp:
> >
> > #include <QtTest>
> > #include <QAndroidJniEnvironment>
> > #include <QtAndroid>
> >
> > class test_jni : public QObject
> > {
> > Q_OBJECT
> >
> > private slots:
> > void test_case1();
> > };
> >
> > void test_jni::test_case1()
> > {
> > QAndroidJniEnvironment qjniEnv;
> > jsize _size = static_cast<jsize>(5);
> > jbyteArray jdata = qjniEnv->NewByteArray(_size);
> > jint result;
> >
> > if (jdata == nullptr)
> > QFAIL("Failed creating new jbyteArray");
> >
> > if (qjniEnv->GetArrayLength(jdata) != _size)
> > {
> > qjniEnv->DeleteLocalRef(jdata);
> > QFAIL("Failed to allocate entire array through JNI");
> > }
> >
> > // Lorem
> > char foo[] = { 0x4c, 0x6f, 0x72 ,0x65, 0x6d };
> >
> > qjniEnv->SetByteArrayRegion(jdata, 0, _size, reinterpret_cast<jbyte
> *>(foo));
> >
> > QtAndroid::runOnAndroidThread([jdata] {
> > QAndroidJniObject::callStaticMethod<jint>(
> > "Foo",
> > "bar",
> > "([B)I",
> > jdata);
> > });
> >
> > QCOMPARE(result, 42);
> > }
> >
> > QTEST_APPLESS_MAIN(test_jni)
> >
> > #include "tst_test_jni.moc"
> >
> > Foo.java:
> >
> > public class Foo {
> > static int bar(byte baz[]) {
> > return 42;
> > }
> > }
> >
> > Have I missed something very basic here?
> >
> >
> > Best regards,
> >
> > René Hansen_______________________________________________ Interest
> mailing list Interest@qt-project.org
> https://lists.qt-project.org/listinfo/interest_______________________________________________
> Interest mailing list Interest@qt-project.org
> https://lists.qt-project.org/listinfo/interest
>
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