Re: [Linphone-developers] How to call JNI Method in Linphone library

[Sylvain Berfini]

Hi,

If you are using linphone library, the following method will return the JNIEnv:

ms_get_jni_env();

For it to work properly, the simple way is to add the following in your native code:

JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *ajvm, void *reserved)

{

    ms_set_jvm(ajvm);

}

Cheers,

Sylvain Berfini
Software Engineer @ Belledonne Communications

On 30/05/2017 14:55, Amine Ghabi wrote:

I have implemented a native method that call a java method, here everything is fine but now I need to call this native method in the Linphone C code but I do not know how to do it, here is the example that I did :

 JNIEXPORT jstring JNICALL
Java_namepackage_getCSR( JNIEnv* env, jobject obj){

    jstring jstr = (*env)->NewStringUTF(env, "CSR");
    jclass clazz = (*env)->FindClass(env, packageName2);
    jmethodID generateMthCSR = (*env)->GetMethodID(env, clazz, myMethodName, "(Ljava/lang/String;)Ljava/lang/String;");
    jobject result = (*env)->CallObjectMethod(env, obj, generateMthCSR, jstr);
    const char* str = (*env)->GetStringUTFChars(env,(jstring) result, NULL); // should be released
    printf("%s\n", str);
    return (*env)->NewStringUTF(env, str);
}

and now I need to call this native method in the linphone library code so when i try to like this :

char *csr = Java_namepackage_getCSR(?, ?); I don't know how to get instance of the JniEnv and the jobject . Thanks for your help  

Amine Ghabi
Ingénieur iOS & Android 
t. 06 03 81 87 91   
a. 242 Rue de Bercy, 75012 Paris
         

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