JNI - 带有ByteBuffer参数的本机方法

Question

我有一个方法:

public native void doSomething(ByteBuffer in, ByteBuffer out);

由javah生成的C/C++此方法的头是:

JNIEXPORT void JNICALL Java__MyClass_doSomething (JNIEnv *, jobject, jobject, jobject, jint, jint);

如何从jobject(即ByteBuffer实例)获取数据数组？

Answer 1

假设您使用ByteBuffer.allocateDirect()分配了ByteBuffer,您可以使用GetDirectBufferAddress

jbyte* bbuf_in;  jbyte* bbuf_out;

bbuf_in = (*env)->GetDirectBufferAddress(env, buf1);  
bbuf_out= (*env)->GetDirectBufferAddress(env, buf2);