![]() Import import /** Simple example of native C POSIX library declaration and usage. Note: The following code is portable and works the same on Windows and POSIX ( Linux / Unix / macOS) platforms. The following program loads the local C standard library implementation and uses it to call the printf function. If the alignment details are not given in the documentation of the native library, the correct alignment must be determined by trial and error during implementation of the Java wrapper. JNA defaults to an OS platform specific setting, that can be overridden by a library specific custom alignment. Native libraries have no standardized memory byte alignment flavor. Memory byte alignment for data structures Note: The meaning of TCHAR changes between char and wchar_t according to some preprocessor definitions. The following table shows an overview of types mapping between Java and native code and supported by the JNA library. It is also possible to tweak and recompile the native build configurations to make it work on most other platforms that run Java. JNA is built and tested on macOS, Microsoft Windows, FreeBSD / OpenBSD, Solaris, Linux, AIX, Windows Mobile, and Android. This makes it quite easy to take advantage of native platform features without incurring the high development overhead of configuring and building JNI code. The developer uses a Java interface to describe functions and structures in the target native library. The JNA library uses native functions allowing code to load a library by name and retrieve a pointer to a function within that library, and uses libffi library to invoke it, all without static bindings, header files, or any compile phase. The JNA library uses a small native library called foreign function interface library ( libffi) to dynamically invoke native code. Unlike JNI, no boilerplate or generated glue code is required. JNA's design aims to provide native access in a natural way with a minimum of effort. Java Native Access ( JNA) is a community-developed library that provides Java programs easy access to native shared libraries without using the Java Native Interface (JNI). ![]() LGPL version 2.1 or later and (from version 4.0 onward) the Apache Software License, version 2.0 Java 1.4 or later (for JNA 3.5.2 or earlier), Java 1.6 for JNA 4.0.0 and later ![]() Windows, macOS, Android, AIX, FreeBSD, Linux, OpenBSD, Solaris, Windows Mobile ![]()
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