I have a little project with cocos2d-x libraries. I'm trying to use C++ to call a Java function but i get a signal 11 exception at line:
// Get Status
status = jvm->GetEnv((void **) &env, JNI_VERSION_1_6);
But i don't know why this is happening.
In my Java class Getsocial.java exist this function:
private void tweet() { String score = "123"; String tweetUrl = "https://twitter.com/intent/tweet?text=Hello ! I have just got " + score + " points in mygame for Android !!!!"; Uri uri = Uri.parse(tweetUrl); startActivity(new Intent(Intent.ACTION_VIEW, uri)); }
This function launch navigator to post a tweet. Called from Java works fine.
In my C++ InterfaceJNI.h I have:
#ifndef __INTERFACE_JNI_H__ #define __INTERFACE_JNI_H__ #include "cocos2d.h" class InterfaceJNI { public: static void postMessageToFB(); static void postMessageToTweet(); protected: }; #endif // __INTERFACE_JNI_H__
And in InterfaceJNI.cpp:
#include "InterfaceJNI.h" #include "platform/android/jni/JniHelper.h" #include jni.h > #include android/log.h > using namespace cocos2d; void InterfaceJNI::postMessageToTweet() { int status; JNIEnv *env; JavaVM *jvm; jmethodID mid; jclass mClass; bool isAttached = false; CCLog("Static postMessageToTweet"); // Get Status status = jvm->GetEnv((void **) &env, JNI_VERSION_1_6); CCLog("Status: %d", status); if(status AttachCurrentThread(&env, NULL); CCLog("Status 2: %d", status); if(status GetStaticMethodID(mClass, "tweet", "()V"); CCLog("mID: %d", mid); if (mid!=0) env->CallStaticVoidMethod(mClass, mid); //----------------------------------------------------------- CCLog("Finish"); if(isAttached) jvm->DetachCurrentThread(); return; }
This interface is called from a part of the code using:
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) InterfaceJNI::postMessageToTweet(); #elif (CC_TARGET_PLATFORM == CC_PLATFORM_IOS) ObjCCalls::trySendATweet(); #endif
What is happening to return a null pointer on jvm->GetEnv((void **) &env, JNI_VERSION_1_6); ?
It looks like your jvm variable is null or garbage. The version of Cocos2D-x I use has a class called JniHelper with a static ::getJavaVM(); method that you might want to use.
JavaVM* vm = JniHelper::getJavaVM();
JNIEnv* env;
vm->GetEnv((void**)&env,JNI_VERSION_1_4); // mine uses JNI_VERSION_1_4
Also, remember to "refresh" your eclipse project every time you build with NDK. You probably do already, but it's worth checking.
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