java 在 C++/JNI 中将向量转换为作业对象？
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convert vector to jobject in C++/JNI?
提问by anirudha mundada
I am using Java native function -
我正在使用 Java 本机功能 -
public native ArrayList<String> parseXML();
In C++ my native function -
在 C++ 中，我的本机函数 -
vector<string> resultList;
JNIEXPORT jobject JNICALL Java_Sample1_parseXML
(JNIEnv *env, jobject obj){
// logic
return resultList; // here getting error
}
My problem is that how to convert resultList (vector type) to jobject type?
我的问题是如何将 resultList（向量类型）转换为作业类型？
采纳答案by Dyonisos
You would have to create a wrapper for the ArrayList in C++. Something like:
您必须在 C++ 中为 ArrayList 创建一个包装器。就像是：
vector <char*> vec;
jclass clazz = (*env).FindClass("java/util/ArrayList");
jobject obj = (*env).NewObject(clazz, (*env).GetMethodID(clazz, "<init>", "()V"));
for (int n=0;n<vec.size();n++)
{
char* str = (char*) static_cast<char*>(vec[n]);
jstring _str = (*env).NewStringUTF(str);
(*env).CallVoidMethod(object, (*env).GetMethodID(clazz, "add", "(java/lang/Object)V"), _str);
}
return obj;
for further information see:
欲了解更多信息，请参阅：
http://download.oracle.com/javase/1.4.2/docs/guide/jni/spec/functions.html
http://download.oracle.com/javase/1.4.2/docs/guide/jni/spec/functions.html
回答by qwertzui11
The method is:
方法是：
bool add(Object);
So the signature is:
所以签名是：
"(Ljava/lang/Object;)Z"
More at: http://docs.oracle.com/javase/1.5.0/docs/guide/jni/spec/types.html#wp276
更多信息：http: //docs.oracle.com/javase/1.5.0/docs/guide/jni/spec/types.html#wp276
vector <char*> vec;
jclass clazz = (*env).FindClass("java/util/ArrayList");
jobject obj = (*env).NewObject(clazz, (*env).GetMethodID(clazz, "<init>", "()V"));
for (int n=0;n<vec.size();n++)
{
char* str = (char*) static_cast<char*>(vec[n]);
jstring _str = (*env).NewStringUTF(str);
(*env).CallBooleanMethod(object, (*env).GetMethodID(clazz, "add", "(Ljava/lang/Object;)Z"), _str);
}
return obj;
