Java JNI - 带有 ByteBuffer 参数的本机方法
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JNI - native method with ByteBuffer parameter
提问by Arek
I've got a method:
我有一个方法：
public native void doSomething(ByteBuffer in, ByteBuffer out);
Generated by javah C/C++ header of this method is:
这个方法的javah C/C++头文件生成的是：
JNIEXPORT void JNICALL Java__MyClass_doSomething (JNIEnv *, jobject, jobject, jobject, jint, jint);
How can I get a data array from jobject (that is a ByteBuffer instance) ?
如何从 jobject（即 ByteBuffer 实例）获取数据数组？
采纳答案by stacker
Assuming you allocated the ByteBuffer using ByteBuffer.allocateDirect() you can use GetDirectBufferAddress
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);
