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Java Native Access (JNA) The definitive JNA reference (including an overview and usage details) is in the JavaDoc.Please read the overview.Questions, comments, or exploratory conversations should begin on the mailing list, although you may find it easier to find answers to already-solved problems on StackOverflow. JNA provides Java programs easy access to native shared libraries without.
From Wikipedia, the free encyclopedia Java Native Access 3.2.3 / 2009-10-08; 3 months ago and 606.9 KB (archived) Development status Active version 2.1 or later. Java Native Access provides programs easy access to without using the. JNA's design aims to provide native access in a natural way with a minimum of effort. No or generated is required. While some attention is paid to performance, correctness and ease of use take priority. The JNA library uses a small native library called to dynamically invoke.
The JNA library uses native functions that allow code to load a library by name and retrieve a to a function within that library, and uses library to invoke it, all without, or any compile phase. The developer uses a to describe functions and structures in the target native library. This makes it quite easy to take advantage of native platform features without incurring the high overhead of configuring and building JNI code. Contents. Adoption Java Native Access is known to be used in:.
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use JNA for functionality. Freedom for Media in Java (FMJ). by the company.
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pure Java Subversion client library. JVLC Java Multimedia Library. FTP, SFTP, WebDAV, Cloud Files & Amazon S3 Browser for Mac OS X.
Mapping types The following table shows the mapping of types between Java and native code and supported by the JNA library. Native Type Size Java Language Type Common Windows Types 8-bit integer BYTE, TCHAR 16-bit short WORD wchart 16/32-bit character WCHAR, TCHAR 32-bit integer DWORD boolean value boolean BOOL long 32/64-bit integer NativeLong LONG long long, int64 64-bit integer 32-bit FP 64-bit FP char. C string String LPTCSTR void. pointer Pointer LPVOID, HANDLE, LPXXX Note: The meaning of TCHAR changes between char and wchart according to some preprocessor definitions. LPCTSTR folows. Example The following program loads the local implementation and uses it to call the function. Note: The following code is portable and works the same on and / / platforms.
Java Native Access from Clojure I tried to pick up multiple times but in the end, I got bored. There is so much boiler plate code that you have to write even for trivial things. A while ago I stumbled upon a project called (Java Native Access), it allows you to access from Java without using the Java Native Interface. I have been meaning to play with it for a while, last night i had some free time, I thought I give it a shot.
I have created two implementations, first one is the way of calling native libraries, it works but it will present problems for some functions, such as there is no way to create a method that accepts variable number of arguments using gen-interface macro which is a big problem for functions like printf, you have to know before hand how many variables you will call it with. There is also the problem of structs. ( def glibc ( Native/loadLibrary 'c' jna.CLibrary)) (.printf glibc 'Hello, World. N ') Obvious problem here, is that this will only work for simple functions, pretty much all functions that does something interesting, will expect some sort of structure as a parameter which we can not emulate in Clojure. While digging through the documentation, I found the class which allows you to make calls without creating an interface, with it we can now pass variables as an array which allows us to call printf with variable length arguments.
(jna-call:c 'printf' Integer 'kjhkjh');; Some POSIX Calls (jna-call:c 'mkdir' Integer '/tmp/jnatesttemp' 07777) (jna-call:c 'rename' Integer '/tmp/jnatesttemp' '/tmp/jnatesttempas') (jna-call:c 'rmdir' Integer '/tmp/jnatesttempas') Armed with this macro, I thought I can solve the age old Java question, How to find the free space available on the disk? This is where I hit the second wall, the call to get free space on my Mac OS X is, which expects a string pointing to the directory and a struct that it will fill the information for us, a struct which we can not emulate in Clojure. Couple more hours of google fun, it turns out that this can also be worked around.
You can request a Pointer object from JNA which you can pass to functions.