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Message: [QUOTE="Roland Richter, post: 587739"] Dear all, I work on an application which grabs/creates images in a native DLL (written in C++, using Intel's IPP) and displays them in a Java Swing GUI, using a class which displays a given BufferedImage. This, of course, involves some conversions: 1) On the Java side: Call ((DataBufferByte)bufferedImage.getRaster().getDataBuffer()).getData() to obtain a "pointer" to the byte array which backs the BufferedImage. 2) Pass that pointer to the JNI side and copy the contents of the native image into that arry, something like env->SetByteArrayRegion( (jbyteArray)target, 0, size, native_data ); I wonder whether copying in step 2) could be avoided. java.nio is said to provide direct byte buffers for exactly this purpose. However, I could not figure out the details, so I need some help. Seems like there are two possibilites: 1) On the JNI side, create a ByteBuffer with NewDirectByteBuffer(); hopefully, this buffer is backed by an array (??!), so that one can call the array() method on the Java side and use this byte[] to create a BufferedImage. 2) Create a memory mapped file / MappedByteBuffer on the Java side; get its address calling GetDirectBufferAddress() on the JNI side, and use this memory area for the native images. Both approaches seem error-prone to me; sure I'm missing something??? Any help is highly appreciated. - Roland [/QUOTE]