GIWS is a wrapper generator intended to simplify calling Java from C or C++ by automatically generating the necessary JNI code.
GIWS is released under the CeCILL license.
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Example
The following Java class does some simple computation.
package basic_example; import java.lang.Math; public class MyComplexClass{ public MyComplexClass(){ // the constructor } public long myVeryComplexComputation(double a, double b){ return Math.round(Math.cos(a)+Math.sin(b)*9); } }GIWS gives the capability to call it from C++.
#include <iostream> #include "basic_example.hxx" #include <jni.h> JavaVM* create_vm() { JavaVM* jvm; JNIEnv* env; JavaVMInitArgs args; JavaVMOption options[2]; args.version = JNI_VERSION_1_4; args.nOptions = 2; options[0].optionString = const_cast<char*>("-Djava.class.path=."); options[1].optionString = const_cast<char*>("-Xcheck:jni"); args.options = options; args.ignoreUnrecognized = JNI_FALSE; JNI_CreateJavaVM(&jvm, (void **)&env, &args); return jvm; } using namespace basic_example; using namespace std; int main(){ JavaVM* jvm = create_vm(); MyComplexClass *testOfMyClass = new MyComplexClass(jvm); cout << "My Computation: " << testOfMyClass->myVeryComplexComputation(1.2,80) << endl; return 0; }To generate the binding, GIWS uses a XML declaration. GIWS will generate the JNI code to call the Java object.
<package name="basic_example"> <object name="MyComplexClass"> <method name="myVeryComplexComputation" returnType="long"> <param type="double" name="a" /> <param type="double" name="b" /> </method> </object> </package>See also
- SWIG allows one to call C or C++ from higher level languages