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Questions tagged [jnienv]

The env pointer is a structure that contains the interface to the JVM. It includes all of the functions necessary to interact with the JVM and to work with Java objects.

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Android JNI: SIGSEGV on CallObjectMethod

I am trying to call method of custom Java type, but receiving SIGSEGV signal. Here is the Java Code package com.example.JniApi; public class JniApi { public void test() { MyType obj = new MyType(); …
Igor
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JNI - Send a large byte[] buffer to C++

I'm trying to send a large java buffer byte[] (e.g. 460800) to C++ function using JNI. Below is the sample code: JNIExport void JNICALL XXXXXX_onRecvData(JNIEnv *env, jclass class, jbyteArray data) { jbyte *pData = NULL; pData =…
pree
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How to transfer my code in C++ interface

jboolean Java_org_opencv_samples_NativeActivity_CvNativeActivity_BrightnessJNI ( JNIEnv* env, jobject thiz, jint height, jint width, jintArray in, jintArray out) { jint* _in = env->GetIntArrayElements(in, 0); jint* _out =…
AHF
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eclipse/java -- java.lang.UnsatisfiedLinkError: no ndbclient in java.library.path

This seems to be a very simple problem and I'm hoping for a simple answer. I've read many posts on this but haven't found a solution. Here's a simple program: package org.foo.test.LoadLibTest; public class Main { public static void…
paiego
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How to implement observer pattern in C++, calling Java method in JNI

I have code that is implementing an observer pattern in C++. I have created Java JNI code that is similar to C++ code to register an observer. When I register an observer in Java, it calls a native method that create a listener in C++. I want the…
Nicholas
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JNI Headers not found from xcode

After installing Java 7, All of sudden xcode failed to compile my project saying jni.h file not found error. I've tried by removing java 7 manually with 'rm' command. If I provide compiler flags in xcode project build setting with the path :…
dg_no_9
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JNI call equivalent to MultiByteToWideChar(...)?

I was using WideCharToMultiByte, but I replaced it with env->GetStringUTFChars. I now want to replace MultiBytetoWideChar with a JNI env equivalent call. Does a call exist? Is it GetStringChars?
Mr. Awesome
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How to convert/cast a jobject into jbyte*

I would like to deal with a byte array which is retrieved from java callback function. However, I got an error 'JNIEnv' has no member named 'GetObjectElements' jmethodID FuncGetArray = GetStaticMethodID(clazz, "GetArray", "()[B"); jobject data_obj =…
Wen Hsiao
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Call Java code from C

I use the JNI interface to invoke Java code from C code. While compiling I use the following command: gcc -g -I/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/include/ -I/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/include/linux/ -L/usr/bin/java…
Sharvari Marathe
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Problematic frame Error in while creating JVM using JNI_CreateJavaVM routine for c

Today i get a task for calling java method by c routine.Currently i am calling a c routine by java from where i am calling a java method than i got a fatal error #A fatal error has been detected by the Java Runtime Environment: # SIGSEGV (0xb) at…
Ashish Panery
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last word getting clipped/truncated in jni

I have a page of information- String When the content is in JNI (cpp dll) i am able to see the entire content, however when we see the same string in java, the last word is clipped/truncated. So in order to debug, I am trying to write the content…
user1782807
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JNI. different behavior between different Android OS versions

my application runs following code : void BmrDeviceInfo_convertToC(JNIEnv *pEnv, jobject jBmrDeviceInfo, BmrDeviceInfo& cBmrDeviceInfo){ __android_log_print(ANDROID_LOG_INFO, "BEAMER_JNI", "g_classBmrDeviceInfo is = %s", (g_classBmrDeviceInfo ==…
koleanu
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Show particular system process name on java Swing GUI List

I have a list of system processes given by following method: public native int fetchProcessIDs(int[] pids); public native String getProcessName(int hProcess); I have to show these processes on java swing GUI list.But I want to show only…
Surjit
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Using JNI in Mono to Access Java Library

I am developing an app using mono for Android and have been strugelling to get the push notifications working, I am using Urban Airship. So far I have been able to call TakeOff() and EnablePush() and my app is successfully registering, see the…
Adrian
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set a string from c jni to java

I have a problem to set a string from jni to java class,i wrote the jni (in c) , I want to set a string from jni to java i did like this jclass cls; jmethodID mid; /* cls = (*env)->GetObjectClass(env, obj); */ cls = (*env)->FindClass…
Mr.Cool
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