如何从C++使用JNI将多个参数传递给CallObjectMethod

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; 
} 
+1

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

//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);