[Swig-user] pass pointer to pointer from c to java

[zy.jiang <ja...@gm...>]

Hi all:
i have a function like this:
int *request_computer_list* (struct computer **computer, uint16_t who);
i want to access the "*struct computer ***" with "*computer[]*" in java ,
so i make some typemaps :
*%typemap(jni) struct computer** "jobjectArray"
%typemap(javain) struct computer** "$javainput"
%typemap(jtype) struct computer** "computer[]"
%typemap(jstype) struct computer** "computer[]"
%typemap(javaout) struct computer** {
return $jnicall;
}
%typemap(in) struct computer **computer (struct computer *computer) {
$1 = &computer;
}

%typemap(argout) struct computer** {
int i;
jclass clazz = (*jenv)->FindClass(jenv,"lib/computer");

jobject temp_obj;
jmethodID cid=(*jenv)->GetMethodID(jenv,clazz, "<init>", "()V");
if(cid==NULL)
return 0;

for (i=0; i<result; i++) {
temp_obj = (*jenv)->NewObject(jenv,clazz,cid,(jobject*)*arg1);
(*jenv)->SetObjectArrayElement(jenv,jarg1, i,temp_obj);

}
}
and the XX_wrap.c like this:

SWIGEXPORT jint JNICALL
Java_lib_drqueueJNI_request_1computer_1list(JNIEnv *jenv, jclass jcls,
jobjectArray jarg1, jint jarg2) {
jint jresult = 0 ;
struct computer **arg1 = (struct computer **) 0 ;
uint16_t arg2 ;
int result;
struct computer *computer1 ;

(void)jenv;
(void)jcls;
{
arg1 = &computer1;
}
arg2 = (uint16_t)jarg2;
result = (int)request_computer_list(arg1,arg2);
jresult = (jint)result;
{
int i;
jclass clazz = (*jenv)->FindClass(jenv,"lib/computer");
jobject temp_obj;
jmethodID cid=(*jenv)->GetMethodID(jenv,clazz, "<init>", "()V");
if(cid==NULL)
return 0;
for (i=0; i<result; i++) {
temp_obj = (*jenv)->NewObject(jenv,clazz,cid,(jobject*)*arg1);
arg1++;
(*jenv)->SetObjectArrayElement(jenv,jarg1, i,temp_obj);

}
}
return jresult;
}
*but when i use the out parameter "*struct computer **computer*" in java
,i cann't get right results from the "computer[]".
so ,anybody can tell me what's wrong with it?
also if you know about the good way to wrap pointer to pointer for
java,please email to me!
thanks in advance!