How to return array of String to a java program.! ??

Question

Hi All,
I am new to JNI programming. so trying with simple example. I am having one problem. I have one array of String in my Java program. I want to reverse all the elements in this array and want back this new array in the same form i.e. array of string. So how can I do this ??
Please guide me.....
The function of defination of array in my java code is
public native String[] getReverseStringArray(String[] arrString);
where as my array is like:
String[] arrStr = {"one", "two", "three", "four", "��������","�c��","�J�^�J�i"};
and I am calling function in C file like:
arrStr = employee.getReverseStringArray(arrStr);
and the function defination in my c file is
JNIEXPORT jobjectArray JNICALL
Java_Emp_getReverseStringArray (JNIEnv *env, jobject obj, jobjectArray arr)
// some code will come here......
So can anybody tell me how to do this ??
Thanx in advance...
Pandurang
[email protected]

Answer 1

Hi,
this is quite simple. Here an example function that works like this:
JNIEXPORT jobjectArray JNICALL Java_cadagent_ugopen_UgAssembly_jni_1getStructure
(JNIEnv *env, jclass cls, jstring part)
jobjectArray retvals = NULL;
jstring j_val = NULL;
int child_count = 5;
/* initialize return array */
j_val = (*env)->NewStringUTF(env, "");
retvals = (*env)->NewObjectArray(env, child_count, (*env)->FindClass(env, "java/lang/String"), j_val);
for (i=0;i<child_count;i++)
j_val = (*env)->NewStringUTF(env, "some text");
(*env)->SetObjectArrayElement(env, retvals,i, j_val);
return retvals;
Hope this answers you question.