JNI Test
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.cproject
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83
.cproject
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<tool id="org.eclipse.cdt.build.core.settings.holder.587173658" name="GNU C++" superClass="org.eclipse.cdt.build.core.settings.holder">
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<storageModule moduleId="cdtBuildSystem" version="4.0.0">
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<project id="PICalculator.null.699279890" name="PICalculator"/>
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<configuration configurationName="Default">
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<resource resourceType="PROJECT" workspacePath="/PICalculator"/>
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<storageModule moduleId="org.eclipse.cdt.internal.ui.text.commentOwnerProjectMappings"/>
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<storageModule moduleId="org.eclipse.cdt.make.core.buildtargets">
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<buildTargets>
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<target name="TestJNI.h" path="src/main/jni" targetID="org.eclipse.cdt.build.MakeTargetBuilder">
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<buildCommand>make</buildCommand>
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<buildArguments/>
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<buildTarget>TestJNI.h</buildTarget>
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<stopOnError>true</stopOnError>
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<useDefaultCommand>true</useDefaultCommand>
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<runAllBuilders>true</runAllBuilders>
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</target>
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<target name="all" path="src/main/jni" targetID="org.eclipse.cdt.build.MakeTargetBuilder">
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<buildCommand>make</buildCommand>
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<buildArguments/>
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<buildTarget>all</buildTarget>
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<stopOnError>true</stopOnError>
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<useDefaultCommand>true</useDefaultCommand>
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<runAllBuilders>true</runAllBuilders>
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</target>
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<target name="clean" path="src/main/jni" targetID="org.eclipse.cdt.build.MakeTargetBuilder">
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<buildCommand>make</buildCommand>
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<buildArguments/>
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<buildTarget>clean</buildTarget>
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<stopOnError>true</stopOnError>
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<useDefaultCommand>true</useDefaultCommand>
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<runAllBuilders>true</runAllBuilders>
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</target>
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</buildTargets>
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</storageModule>
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</cproject>
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145
src/main/java/cz/adamh/utils/NativeUtils.java
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src/main/java/cz/adamh/utils/NativeUtils.java
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/*
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* Class NativeUtils is published under the The MIT License:
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*
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* Copyright (c) 2012 Adam Heinrich <adam@adamh.cz>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package cz.adamh.utils;
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import java.io.*;
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import java.nio.file.FileSystemNotFoundException;
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import java.nio.file.FileSystems;
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import java.nio.file.Files;
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import java.nio.file.ProviderNotFoundException;
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import java.nio.file.StandardCopyOption;
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/**
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* A simple library class which helps with loading dynamic libraries stored in the
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* JAR archive. These libraries usualy contain implementation of some methods in
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* native code (using JNI - Java Native Interface).
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*
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* @see http://adamheinrich.com/blog/2012/how-to-load-native-jni-library-from-jar
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* @see https://github.com/adamheinrich/native-utils
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*
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*/
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public class NativeUtils {
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/**
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* The minimum length a prefix for a file has to have according to {@link File#createTempFile(String, String)}}.
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*/
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private static final int MIN_PREFIX_LENGTH = 3;
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/**
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* Temporary directory which will contain the DLLs.
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*/
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private static File temporaryDir;
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/**
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* Private constructor - this class will never be instanced
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*/
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private NativeUtils() {
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}
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/**
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* Loads library from current JAR archive
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*
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* The file from JAR is copied into system temporary directory and then loaded. The temporary file is deleted after
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* exiting.
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* Method uses String as filename because the pathname is "abstract", not system-dependent.
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*
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* @param path The path of file inside JAR as absolute path (beginning with '/'), e.g. /package/File.ext
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* @throws IOException If temporary file creation or read/write operation fails
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* @throws IllegalArgumentException If source file (param path) does not exist
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* @throws IllegalArgumentException If the path is not absolute or if the filename is shorter than three characters
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* (restriction of {@link File#createTempFile(java.lang.String, java.lang.String)}).
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* @throws FileNotFoundException If the file could not be found inside the JAR.
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*/
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public static void loadLibraryFromJar(String path) throws IOException {
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if (!path.startsWith("/")) {
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throw new IllegalArgumentException("The path has to be absolute (start with '/').");
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}
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// Obtain filename from path
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String[] parts = path.split("/");
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String filename = (parts.length > 1) ? parts[parts.length - 1] : null;
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// Check if the filename is okay
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if (filename == null || filename.length() < MIN_PREFIX_LENGTH) {
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throw new IllegalArgumentException("The filename has to be at least 3 characters long.");
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}
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// Prepare temporary file
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if (temporaryDir == null) {
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temporaryDir = createTempDirectory("nativeutils");
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temporaryDir.deleteOnExit();
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}
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File temp = new File(temporaryDir, filename);
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try (InputStream is = NativeUtils.class.getResourceAsStream(path)) {
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Files.copy(is, temp.toPath(), StandardCopyOption.REPLACE_EXISTING);
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} catch (IOException e) {
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temp.delete();
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throw e;
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} catch (NullPointerException e) {
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temp.delete();
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throw new FileNotFoundException("File " + path + " was not found inside JAR.");
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}
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try {
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System.load(temp.getAbsolutePath());
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} finally {
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if (isPosixCompliant()) {
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// Assume POSIX compliant file system, can be deleted after loading
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temp.delete();
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} else {
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// Assume non-POSIX, and don't delete until last file descriptor closed
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temp.deleteOnExit();
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}
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}
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}
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private static boolean isPosixCompliant() {
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try {
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if (FileSystems.getDefault()
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.supportedFileAttributeViews()
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.contains("posix")) {
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return true;
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}
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return false;
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} catch (FileSystemNotFoundException
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| ProviderNotFoundException
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| SecurityException e) {
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return false;
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}
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}
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private static File createTempDirectory(String prefix) throws IOException
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{
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String tempDir = System.getProperty("java.io.tmpdir");
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File generatedDir = new File(tempDir, prefix + System.nanoTime());
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if (!generatedDir.mkdir())
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throw new IOException("Failed to create temp directory " + generatedDir.getName());
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return generatedDir;
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}
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}
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9
src/main/jni/TestJNI.c
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9
src/main/jni/TestJNI.c
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#include <jni.h>
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#include <stdio.h>
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#include "TestJNI.h"
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JNIEXPORT void JNICALL Java_org_warp_picalculator_TestJNI_sayHello(JNIEnv *env, jobject thisObj)
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{
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printf("Hello World!\n");
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return;
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}
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21
src/main/jni/TestJNI.h
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src/main/jni/TestJNI.h
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/* DO NOT EDIT THIS FILE - it is machine generated */
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#include <jni.h>
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/* Header for class org_warp_picalculator_TestJNI */
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#ifndef _Included_org_warp_picalculator_TestJNI
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#define _Included_org_warp_picalculator_TestJNI
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Class: org_warp_picalculator_TestJNI
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* Method: sayHello
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* Signature: ()V
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*/
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JNIEXPORT void JNICALL Java_org_warp_picalculator_TestJNI_sayHello
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(JNIEnv *, jobject);
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#ifdef __cplusplus
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}
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#endif
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#endif
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BIN
src/main/jni/TestJNI.o
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BIN
src/main/jni/TestJNI.o
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24
src/main/jni/makefile
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src/main/jni/makefile
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# Define a variable for classpath
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CLASS_PATH = ../../../target/classes
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PATH1A = org/warp/picalculator
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PATH1B = org.warp.picalculator
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# Define a virtual path for .class in the bin directory
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vpath %.class $(CLASS_PATH)/$(PATH1A)
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all : picalculatornative.dll
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# $@ matches the target, $< matches the first dependancy
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picalculatornative.dll : TestJNI.o
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x86_64-w64-mingw32-gcc.exe -m64 -mtune=generic -Wl,--add-stdcall-alias -shared -o ../resources/$@ $<
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# $@ matches the target, $< matches the first dependancy
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TestJNI.o : TestJNI.c TestJNI.h
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x86_64-w64-mingw32-gcc.exe -m64 -mtune=generic -I"G:\Program Files\Java\jdk1.8.0_144\include" -I"G:\Program Files\Java\jdk1.8.0_144\include\win32" -c $< -o $@
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# $* matches the target filename without the extension
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TestJNI.h : TestJNI.class
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javah -o "$*.h" -classpath "$(CLASS_PATH)" $(PATH1B).$*
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clean :
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rm TestJNI.h TestJNI.o ../resources/picalculatornative.dll
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BIN
src/main/resources/picalculatornative.dll
Normal file
BIN
src/main/resources/picalculatornative.dll
Normal file
Binary file not shown.
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