通过 JNI 获取 Java ByteBuffer 的指针 [英] Get the pointer of a Java ByteBuffer though JNI
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问题描述
How can I get a pointer to the inner array of a Java ByteBuffer?
JNIEXPORT void JNICALL test(JNIEnv *env, jobject thiso) {
jclass cls = env->FindClass("java/nio/ByteBuffer");
jmethodID aloc = env->GetStaticMethodID(cls, "allocateDirect", "(I)Ljava/nio/ByteBuffer;");
jobject obj = env->CallStaticObjectMethod(cls, aloc, 1000);
}
PS: I'm doing that to share the memory used by Java and C++.
解决方案
void * data = env->GetDirectBufferAddress(obj);
The ByteBuffer must be a direct one for this to work.
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