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vrunoa/jniChar2jbyteArray.cpp

Last active August 25, 2022 15:12
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Convertng char* to jbyteArray the right way
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jniChar2jbyteArray.cpp
JNIEXPORT jbyteArray JNICALL Java_com_urucas_test_getframes(JNIEnv* env, jobject thiz) {
__android_log_write(ANDROID_LOG_INFO, "Test", "getting frames");
char* frame;
int len;
processor->getFrames(&frame, &len);
jbyteArray arr = env->NewByteArray(len);
env->SetByteArrayRegion(arr, 0, len, reinterpret_cast<jbyte*>(&frame));
delete processor;
return arr;
}
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ghost commented Apr 30, 2018

hi thanks, will help!

@Sammers21
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I guess at line 7 it should be env->SetByteArrayRegion(arr, 0, len, reinterpret_cast<jbyte*>(&frame));

@HetDerwel
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HetDerwel commented Mar 5, 2021 •
edited

@Sammers21 well actually to be totally correct, it should be:
env->SetByteArrayRegion(arr, 0, len, reinterpret_cast<const jbyte*>(frame));
It frame is already the pointer that you want, so you don't want to be taking its address.

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