Java jni: What's Wrong here?
- From: "John J. Boyer" <john.boyer@xxxxxxxxxxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Sat, 29 Jan 2011 03:35:59 -0600
One of the functgions in my Java bindings for liblouisutdml (Which will
be used in BrailleBlaster) requires a variable number of arguments. The
native method diclaration handles this with String[] The C function gets
a jObjectArray when it is called. The function which I am pasting below
is supposed to get each argument in turn according to the value of the
index parameter. It produces a segmentation fault. I think the problem
is in the line that attempts to procuce a C character string from the
Jobject. Suggestions? Thanks.
JNIEXPORT const jbyte *JNICALL
getArg (JNIEnv * env, jobject this, jobjectArray args, jint index)
{
static jobject curObj = NULL;
static const jbyte *curArg = NULL;
if (args == NULL)
return NULL;
if (curObj != NULL || index == -1)
{
if (curArg != NULL)
(*env)->ReleaseStringUTFChars (env, curObj, curArg);
curArg = NULL;
curObj = NULL;
}
curObj = (*env)->GetObjectArrayElement (env, args, index);
curArg = (*env)->GetStringUTFChars (env, curObj, NULL);
return curArg;
}
--
John J. Boyer; President, Chief Software Developer
Abilitiessoft, Inc.
http://www.abilitiessoft.com
Madison, Wisconsin USA
Developing software for people with disabilities
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