Abstract

This chapter summarizes that the next phase of development in the Digital Input-Output (DIO) appliance project is to make the DIO interface Web-aware. The first step is to develop a Java Native Interface (JNI) for the DIO interface library. The JNI is a programming interface, included in the Java Development Kit (JDK) for FreeBSD for writing Java native methods for calling C/C++ routines. The chapter discusses the installation of the JDK for FreeBS, defines JNI DIO features, implementation of native C data types in Java, implementation of the JNI native interface layer for the DIO interface library. With the implementation of the set line, get line, and get direction functions as a foundation, the remainder to DIO interface class in the JNI layer is implemented.

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