Try JNA with JNAerator: https://code.google.com/p/jnaerator. I've used it successfully in my own projects.
How to use a C library such as PJSIP on java?
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29-05-2022 - |
Вопрос
Is there a way to use and invoke method calls from a library compiled in C such as the PJSIP library?
I want to use and invoke calls from the pjsip lib that i have compiled but the obvious issue is that pjsip is a C library not a java library ie a jar file.
Possible? Maybe JNI?
Thanks
edit: tried using Swig to do the task at hand but all it does is create a empty class file.
here is the command i use to execute swig:
swig -verbose -java -package com.josh.sip.util -o jni_wrapper.c pjsua.i
output from swig command
Language subdirectory: java
Search paths:
.\
.\swig_lib\java\
C:\Users\jonney\Downloads\swigwin-2.0.9\Lib\java\
.\swig_lib\
C:\Users\jonney\Downloads\swigwin-2.0.9\Lib\
Preprocessing...
Starting language-specific parse...
Processing types...
C++ analysis...
Generating wrappers...
pjsua java class it creates for me:
/* ----------------------------------------------------------------------------
* This file was automatically generated by SWIG (http://www.swig.org).
* Version 2.0.9
*
* Do not make changes to this file unless you know what you are doing--modify
* the SWIG interface file instead.
* ----------------------------------------------------------------------------- */
package com.josh.sip.util;
public class pjsua {
}
The pjsua jni file it creates for me
/* ----------------------------------------------------------------------------
* This file was automatically generated by SWIG (http://www.swig.org).
* Version 2.0.9
*
* Do not make changes to this file unless you know what you are doing--modify
* the SWIG interface file instead.
* ----------------------------------------------------------------------------- */
package com.josh.sip.util;
public class pjsuaJNI {
}
The jni_wrapper.c it generates for me below:
/* ----------------------------------------------------------------------------
* This file was automatically generated by SWIG (http://www.swig.org).
* Version 2.0.9
*
* This file is not intended to be easily readable and contains a number of
* coding conventions designed to improve portability and efficiency. Do not make
* changes to this file unless you know what you are doing--modify the SWIG
* interface file instead.
* ----------------------------------------------------------------------------- */
#define SWIGJAVA
/* -----------------------------------------------------------------------------
* This section contains generic SWIG labels for method/variable
* declarations/attributes, and other compiler dependent labels.
* ----------------------------------------------------------------------------- */
/* template workaround for compilers that cannot correctly implement the C++ standard */
#ifndef SWIGTEMPLATEDISAMBIGUATOR
# if defined(__SUNPRO_CC) && (__SUNPRO_CC <= 0x560)
# define SWIGTEMPLATEDISAMBIGUATOR template
# elif defined(__HP_aCC)
/* Needed even with `aCC -AA' when `aCC -V' reports HP ANSI C++ B3910B A.03.55 */
/* If we find a maximum version that requires this, the test would be __HP_aCC <= 35500 for A.03.55 */
# define SWIGTEMPLATEDISAMBIGUATOR template
# else
# define SWIGTEMPLATEDISAMBIGUATOR
# endif
#endif
/* inline attribute */
#ifndef SWIGINLINE
# if defined(__cplusplus) || (defined(__GNUC__) && !defined(__STRICT_ANSI__))
# define SWIGINLINE inline
# else
# define SWIGINLINE
# endif
#endif
/* attribute recognised by some compilers to avoid 'unused' warnings */
#ifndef SWIGUNUSED
# if defined(__GNUC__)
# if !(defined(__cplusplus)) || (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
# define SWIGUNUSED __attribute__ ((__unused__))
# else
# define SWIGUNUSED
# endif
# elif defined(__ICC)
# define SWIGUNUSED __attribute__ ((__unused__))
# else
# define SWIGUNUSED
# endif
#endif
#ifndef SWIG_MSC_UNSUPPRESS_4505
# if defined(_MSC_VER)
# pragma warning(disable : 4505) /* unreferenced local function has been removed */
# endif
#endif
#ifndef SWIGUNUSEDPARM
# ifdef __cplusplus
# define SWIGUNUSEDPARM(p)
# else
# define SWIGUNUSEDPARM(p) p SWIGUNUSED
# endif
#endif
/* internal SWIG method */
#ifndef SWIGINTERN
# define SWIGINTERN static SWIGUNUSED
#endif
/* internal inline SWIG method */
#ifndef SWIGINTERNINLINE
# define SWIGINTERNINLINE SWIGINTERN SWIGINLINE
#endif
/* exporting methods */
#if (__GNUC__ >= 4) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
# ifndef GCC_HASCLASSVISIBILITY
# define GCC_HASCLASSVISIBILITY
# endif
#endif
#ifndef SWIGEXPORT
# if defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
# if defined(STATIC_LINKED)
# define SWIGEXPORT
# else
# define SWIGEXPORT __declspec(dllexport)
# endif
# else
# if defined(__GNUC__) && defined(GCC_HASCLASSVISIBILITY)
# define SWIGEXPORT __attribute__ ((visibility("default")))
# else
# define SWIGEXPORT
# endif
# endif
#endif
/* calling conventions for Windows */
#ifndef SWIGSTDCALL
# if defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
# define SWIGSTDCALL __stdcall
# else
# define SWIGSTDCALL
# endif
#endif
/* Deal with Microsoft's attempt at deprecating C standard runtime functions */
#if !defined(SWIG_NO_CRT_SECURE_NO_DEPRECATE) && defined(_MSC_VER) && !defined(_CRT_SECURE_NO_DEPRECATE)
# define _CRT_SECURE_NO_DEPRECATE
#endif
/* Deal with Microsoft's attempt at deprecating methods in the standard C++ library */
#if !defined(SWIG_NO_SCL_SECURE_NO_DEPRECATE) && defined(_MSC_VER) && !defined(_SCL_SECURE_NO_DEPRECATE)
# define _SCL_SECURE_NO_DEPRECATE
#endif
/* Fix for jlong on some versions of gcc on Windows */
#if defined(__GNUC__) && !defined(__INTEL_COMPILER)
typedef long long __int64;
#endif
/* Fix for jlong on 64-bit x86 Solaris */
#if defined(__x86_64)
# ifdef _LP64
# undef _LP64
# endif
#endif
#include <jni.h>
#include <stdlib.h>
#include <string.h>
/* Support for throwing Java exceptions */
typedef enum {
SWIG_JavaOutOfMemoryError = 1,
SWIG_JavaIOException,
SWIG_JavaRuntimeException,
SWIG_JavaIndexOutOfBoundsException,
SWIG_JavaArithmeticException,
SWIG_JavaIllegalArgumentException,
SWIG_JavaNullPointerException,
SWIG_JavaDirectorPureVirtual,
SWIG_JavaUnknownError
} SWIG_JavaExceptionCodes;
typedef struct {
SWIG_JavaExceptionCodes code;
const char *java_exception;
} SWIG_JavaExceptions_t;
static void SWIGUNUSED SWIG_JavaThrowException(JNIEnv *jenv, SWIG_JavaExceptionCodes code, const char *msg) {
jclass excep;
static const SWIG_JavaExceptions_t java_exceptions[] = {
{ SWIG_JavaOutOfMemoryError, "java/lang/OutOfMemoryError" },
{ SWIG_JavaIOException, "java/io/IOException" },
{ SWIG_JavaRuntimeException, "java/lang/RuntimeException" },
{ SWIG_JavaIndexOutOfBoundsException, "java/lang/IndexOutOfBoundsException" },
{ SWIG_JavaArithmeticException, "java/lang/ArithmeticException" },
{ SWIG_JavaIllegalArgumentException, "java/lang/IllegalArgumentException" },
{ SWIG_JavaNullPointerException, "java/lang/NullPointerException" },
{ SWIG_JavaDirectorPureVirtual, "java/lang/RuntimeException" },
{ SWIG_JavaUnknownError, "java/lang/UnknownError" },
{ (SWIG_JavaExceptionCodes)0, "java/lang/UnknownError" }
};
const SWIG_JavaExceptions_t *except_ptr = java_exceptions;
while (except_ptr->code != code && except_ptr->code)
except_ptr++;
(*jenv)->ExceptionClear(jenv);
excep = (*jenv)->FindClass(jenv, except_ptr->java_exception);
if (excep)
(*jenv)->ThrowNew(jenv, excep, msg);
}
/* Contract support */
#define SWIG_contract_assert(nullreturn, expr, msg) if (!(expr)) {SWIG_JavaThrowException(jenv, SWIG_JavaIllegalArgumentException, msg); return nullreturn; } else
#include "pjsua.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __cplusplus
}
#endif
I have the pjsua.h file inside same location as my .i file so its easier to find both whilst executing the swig command and any advice?
I basically want swig or any other tool to create a pjsua or pjsip java class with all its implementations or interface methods i can use to actually use the library.
Such as a pain that there is no java version of this sip stack
Решение
Другие советы
I've found the simplest way to do this, if you have the header files, is to use SWIG. You create a yourmodule.i
file for your module (the library) and include all of the classes you want to access via JNI. E.g:
%module Foo
%{
#include "Bar.h"
%}
You can also provide typemaps from C to Java structures.
If you want to ignore a certain method:
%ignore fooBar(int baz);
You can run swig to generate some java classes like this:
swig -c -verbose -java -package com.your.java.package -o jni_wrapper.c yourfile.i
See the Java documentation for more information and examples.
I would recommend using Javacpp I used it before and it worked pretty good, the thing you need here is just a bridge, SWIG is not very friendly, and I wasted a lot of time with it before.
As for the requested specific library try this one pjsip-jni, its wrapper for the pjsip written in java and jni.