If you’re going to be doing this with a lot of objects, something like Swig would be best. You could use jobject type to pass around custom objects. The syntax isn’t nice, perhaps there is a better way to write this. Example Employee object: public class Employee { private int age; public Employee(int age) { … Read more
Native library can be loaded by loadLibrary with a valid name. By example, libXXXX.so for linux family, your hellolib.so should rename to libhello.so. By the way, I develop java with jni, I will separate the implementation and native interface (.c or .cpp). static { System.loadLibrary(“hello”); // will load libhello.so } The implementation header(HelloImpl.h): #ifndef _HELLO_IMPL_H … Read more
I suspect the issue is that your class has a package and you are trying to run the command from the directory with the class file instead of the package root. Samhain’s example works because his MyClass.java contains no package, whereas I suspect yours does. For example, assume we have the following file at c:\src\com\example\MyClass.java … Read more
Did you try something like this: <dependency> <groupId>com.foo</groupId> <artifactId>footron</artifactId> <version>4.2</version> <scope>runtime</scope> <type>dll</type> </dependency> You can add them to maven’s repository with something like this: mvn install:install-file -Dfile=footron.dll -DgroupId=com.foo -DartifactId=footron -Dversion=4.2 -Dpackaging=dll -DgeneratePom=true Haven’t done this for DLLs but something like this should work.
I don’t have Windows 7 but here is something that might get you started: On the Java side: package com.stackoverflow.homework; public class MyApplication { static native boolean setAppUserModelID(); static { System.loadLibrary(“MyApplicationJNI”); setAppUserModelID(); } } And on the native side, in the source code of the `MyApplicationJNI.dll library: JNIEXPORT jboolean JNICALL Java_com_stackoverflow_homework_MyApplication_setAppUserModelID(JNIEnv* env) { LPCWSTR id … Read more
These methods are either Intrinsic or written outside Java in “native” code, that is, specific to the given machine. The ones you mention are Intrinsic and part of the JDK but you can also write native methods yourself using the Java Native Interface (JNI). This would normally use C to write the methods, but a … Read more
You can write a simple function that takes a jobjectArray object, cast each one to jstring and then call GetStringUTFChars on it. Like this: void MyJNIFunction(JNIEnv *env, jobject object, jobjectArray stringArray) { int stringCount = env->GetArrayLength(stringArray); for (int i=0; i<stringCount; i++) { jstring string = (jstring) (env->GetObjectArrayElement(stringArray, i)); const char *rawString = env->GetStringUTFChars(string, 0); // … Read more
JNA seems the industry standard of what you want, “provides Java programs easy access to native shared libraries (DLLs on Windows) without writing anything but Java code—no JNI or native code is required” There is also Java Foreign Function Interface – example usage If is ok for you, you could embed the JRuby interpreter and … Read more
you can get jbyte* by GetByteArrayElements: jbyte* bufferPtr = (*env)->GetByteArrayElements(env, array, NULL); And it is important to know the length of your array: jsize lengthOfArray = (*env)->GetArrayLength(env, array); Having jbyte* and length, you can do all the things in c-array. Finally, releasing it: (*env)->ReleaseByteArrayElements(env, array, bufferPtr, 0);
You would use the Java Native Interface to call your C# code compiled into a DLL. If its a small amount of C#, it would be much easier to port it to Java. If its a lot, this might be a good way to do it. Here is a highlevel overview of it: http://en.wikipedia.org/wiki/Java_Native_Interface Your … Read more