All Questions
30
questions
0
votes
1
answer
73
views
Callback function's byte parameter has value out of bounds in project Panama function interface
I'm using the new Foreign function & memory API which is part of project Panama and available in preview in JAVA 19.
This is a simple Java callback function
public static byte addFive(byte t) {
...
- 2,058
0
votes
0
answers
918
views
"CallObjectMethod" in JNI-Callback returns NULL
I have a JNI-Interface between C++ and Java. I want to pass a callback function as a parameter in a function on java side. This will be called later in C ++ via JNI and should return me a string.
This ...
- 9
-1
votes
1
answer
1k
views
JNI error - cant call [method] when using CallVoidMethod
My goal is to have an infinite loop in the c code that does a callback passing a String to a Java function. The Java function then uses the String to update the contents of a textbox. The problem is ...
2
votes
2
answers
460
views
Java Invocation API: Call the C function back from the java code
I have a C (navive) program and a jar file with the main() method. From my native program I am initializing the JVM, and calling the main() method. I have no problems with this, everything is ...
- 2,747
0
votes
0
answers
175
views
Implement callback function as interface in JNI and save reference in the function pointer
So basically I have such struct in the C++ side:
typedef int(*callback)(int, int);
typedef struct InfoCallback {
int a;
int b;
callback call;
} InfoCallback_t;
And I would very much ...
- 773
0
votes
0
answers
433
views
Jni - Call c++ method from java using void pointers
Is there any way to call a native (c++) method from java using the method's function pointer?
Basically i want to use this for callbacks. Once a certain event in java get's fired, i want java to call ...
- 178
1
vote
1
answer
3k
views
JNI callback to Java from c++ class crashing
I'm trying to call a Java function from a C++ class using JNI on Android. I have searched and searched but haven't found my exact case. I can call methods in my c++ library from Java, but am having ...
- 49
1
vote
1
answer
834
views
How to pass array to java method from jni
I am trying to pass a int array from JNI to Java. When I pass single or multiple int value, it works but passing array is not working. Every time app crash and return the following error
Error
...
- 2,408
1
vote
0
answers
372
views
Getting crash in JNI callback from C to Java
I am using a third party C native library which is calling callbacks to my JNI.
So in my JNI's C portion, I have a callback function callback() which i registered to the library while initialization. ...
- 8,094
1
vote
1
answer
3k
views
JNI callback passed to C
I have a java callback function I want to pass to a C++ wrapper that will in turn pass it to a C/C++ function.
How would I do this?
I imagine the wrapper has to create some type of C++ lambda ...
- 307
2
votes
1
answer
572
views
Accessed stale local reference passing short[] from JNI to Java
Hello I'm writing a program for Android with Java and JNI.
I'm caching JavaVM*, a global ref jclass and 2 methodsID in the onLoad().
Then from myCallback(), which is running on a separate thread, I ...
- 996
1
vote
1
answer
961
views
Call Java method from JNI after callback is received
I'm building a JNI app.
From my JNI code I want to call a java funcion that updated the UI.
Basically when I receive a callback and try to get the reference to the environment I get an error of ...
- 996
1
vote
1
answer
3k
views
JVM crashing on attachCurrentThread JNI callback invocation
Hope you are doing well.
I have a JNI implementation in C wherein a C function attach to current JVM thread and callback a Java method, which is actually crashing the JVM upon attachCurrentThread() ...
- 75
1
vote
2
answers
1k
views
How to implement a callback function that calls from Java to C++?
I have a native C++ application that creates a JVM via JNI, instantiates a Java class (an Akka Actor) and invokes asynchronous non-blocking functions on it. I do this using JNI in C++ see snippet ...
- 14.1k
1
vote
2
answers
682
views
JNI: Callback from JVM to C++ fails to run
I start JVM from C++ program.
C++ code:
JNIEXPORT jobject JNICALL com_javelin_JavelinMarketData_callBackIntoNative(JNIEnv* env, jobject obj, jlong ptr)
{
std::cout << "...
- 1,541