Return jbyte to a C function (JNI)

[Ann]

I have a program,which reads a String from the user.

char buf[128];
const jbyte *jnistr;
jsize strsize;
jnistr = (*env)->GetStringUTFChars(env,prompt,NULL);
if(jnistr==NULL){
return;
}
strsize = (*env)->GetStringLength(env,prompt);

testBuffer(*jnistr,strsize);


After converion, it is in the varibale jnistr ,which is a const jbyte.

My confusion starts here:
How can I pass the const jbyte to a C function, so that the whole
string is accessible.

When I try to return the jnistr, and accept it as a char parameter in
the C function testBuffer(), I can only read the first letter of the
string and nothing beyond that.

Thank You,
Ann

 

[Gordon Beaton]

const jbyte *jnistr;
testBuffer(*jnistr,strsize);

When I try to return the jnistr, and accept it as a char parameter
in the C function testBuffer(), I can only read the first letter of
the string and nothing beyond that.

That's because you've passed the wrong type to testBuffer(). If jnistr
is declared as jbyte*, then *jnistr is a single jbyte, not an array of
them.

Pass it like this instead:

testBuffer(jnistr, strsize);

I suspect that testBuffer() is declared incorrectly as well, or that
you've ignored warnings from your compiler.

/gordon