#JAVA NATIVE ACCESS TUTORIAL ARCHIVE#
The archive holds the file of the demo which displays a simple text using the puts function of the C language. If (System.getProperty("os.name").contains("Windows"))ĬInterface demo = (CInterface) Native.loadLibrary(libName, CInterface.class) Library is c for unix and msvcrt for windows ("Syntax: java -jar /jna/dist/demo.jar \"myowntext\"") ("You can enter you own text between quotes.") You can add the interface to all the functions you need, if they are present in the same DLL, and create an interface for each DLL file to include.įull source code: // JNA Demo. Then type the command: java -jar /jna/dist/hello.jar "My own text!" Project Properties -> Libraries -> Add JAR / Folder.
Download the project file, it is unpacked into the JNA directory.CInterface.java that holds the interface above. In addition, the library jna.jar must be included in the project.Ī complete project for NetBeans can be downloaded. To use the method puts simply create an instance of CInterface: CInterface demo = (CInterface) Native.loadLibrary(libName, CInterface.class) įor this to work, some imports are required: import Inside the interface, C functions are declared as methods. We have declared the CInterface interface which is a subclass of JNA. Public interface CInterface extends Library We want to use the puts function of the C language, which is provided by the msvcrt.dll file in Windows, create the following interface: package CInterface To use them, simply include the file that defines them and declare the header of these functions in an interface.
#JAVA NATIVE ACCESS TUTORIAL CODE#
Unlike JNI, it does not require to generate code for using C functions. Java Native Access is an extension to Java that allows the use of native APIs by including dynamically library files, DLLs under Windows. To use native code with Java, JNA is simpler than JNI, here is a simple demonstration. Java Agents Java Compiler - 'javac' Java deployment Java Editions, Versions, Releases and Distributions Java Floating Point Operations Java Memory Management Java Memory Model Java Native Access Java Native Interface Java Performance Tuning Java Pitfalls - Exception usage Java Pitfalls - Language syntax Java Pitfalls - Nulls and.
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