如何从C++使用JNI将多个参数传递给CallObjectMethod
问题描述:
我想将三个字符串传递给使用JNI的java静态方法,但我找不到如何执行它。我能够传递一个单一的字符串作为输入,但不清楚如何传递多个参数。您可以帮忙吗?如何从C++使用JNI将多个参数传递给CallObjectMethod
int _tmain(int argc, _TCHAR* argv[])
{
JavaVM *vm;
JNIEnv *env;
JavaVMInitArgs vm_args;
JavaVMOption options[1];
vm_args.version = JNI_VERSION_1_2;
vm_args.nOptions = 1;
options[0].optionString = "-Djava.class.path=C:\\Algorithm\\output";
vm_args.options = options;
vm_args.ignoreUnrecognized = 1;
// Construct a VM
jint res = JNI_CreateJavaVM(&vm, (void **)&env, &vm_args);
jclass clazz_algo = env->FindClass("systems/DataExchange");
if (env->ExceptionCheck()) {
return 1;
}
// init(String, String, String)
jmethodID initMethod = env->GetStaticMethodID(clazz_algo, "init", "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V");
//HOW DO I CALL initMethod with three strings as input?
// Shutdown the VM.
vm->DestroyJavaVM();
return 0;
}
答
//HOW DO I CALL initMethod with three strings as input?
// Those are created as example
jstring str1=NewStringUTF(env, "Str1");
jstring str2=NewStringUTF(env, "Str2");
jstring str3=NewStringUTF(env, "Str3");
// C++ style
env->CallStaticVoidMethod(clazz_algo, initMethod, str1,str2,str3);
// ... or C-style
CallStaticVoidMethod(env, clazz_algo, initMethod, str1,str2,str3);
从[文档](http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html):'本地类型呼叫方法( JNIEnv * env,jobject obj, jmethodID methodID,...);'_“程序员**将所有要传递给方法的参数放在紧跟在'methodID'参数**之后的方法**'调用方法'例程接受这些参数并将它们传递给程序员希望调用的Java方法。“_ –
Michael