Boris,
This is not really the right list for this question, since it isn't
specifically about java on Linux. You might be better off sending questions
like this to a more general java list. But you want to look at using the
"GetLongArrayElements" and "ReleaseArrayElements" functions in your C code. I
think it goes something like this:
JNIEXPORT void JNICALL Java_call_aug(JNIEnv *env, jopject obj, jlongArray a)
{
long* array_in_c = (*env)->GetLongArrayElements(env, a, 4); /* assuming length
of 4 */
/* Do whatever you want to array_in_c */
(*env)->ReleaseArrayElements(env, a, 0);
}
cheers,
Rich
Boris wrote:
>
> hello,
> I meet a question in passing argments between java and c.
> In my java program,I call a method in a .dll file and pass a array to it.
> In the .h file that generated by javah,function declaration is followling:
> JNIEXPORT void JNICALL Java_call_aug
> (JNIEnv *, jobject, jlongArray);
>
> I write the following in my c file:
> JNIEXPORT void JNICALL Java_call_aug
> (JNIEnv *env, jobject obj, jlongArray a)
> {
> a[0]=1;
> }
>
> when I build it by vc++,vc++ show the fllowing:
> D:\Boris\args\argdll\arg.cpp(26) : error C2679: binary '=' : no operator defined
>which
> takes a right-hand operand of type 'const int' (or there is no acceptable conversion)
>
> error line is a[0]=1;
>
> How can I pass array ?Or,if I want pass data and want them changed in c ,then
> return,how can i do?
> Thanks
> Boris :-)
>
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