Java和C ++之间使用JNI的SharedBuffer [英] SharedBuffer between Java and C++ using JNI

问题描述

我正在研究的是使用C ++从相机读取图像数据，并使用JNI让Java读取那些图像数据，而我正在使用Mac OSX.

what I am working on is to read image data from camera using C++ and use JNI to let Java read those image data, and I am using Mac OSX.

我目前拥有的阻止者是，我还没有找到任何在Mac OSX上的两种语言之间创建共享内存的方法.

The blocker I currently have is, I have not found any method to create a shared memory between two language on Mac OSX.

我可以想象我会使用一些缓冲区来做到这一点，有人能对此问题提供一些提示和知识吗?

I could imagine I will be using some buffer to do so, could anyone gives some hints and knowledge towards this problem?

提前谢谢！

推荐答案

您可以使用

You can use ByteBuffer.allocateDirect to create native accessible memory:

public static native void getCameraData(ByteBuffer bb);

...

ByteBuffer bb = ByteBuffer.allocateDirect(1024);
getCameraData(bb);
// use data

然后在C ++端，使用

Then on the C++ side, use GetDirectBufferAddress, to access the block of memory:

JNIEXPORT void JNICALL Java_MyClass_getCameraData(JNIEnv *env, jclass, jobject bb) {
    void* data = env->GetDirectBufferAddress(bb);
}

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