I should have compiled with -pedantic, of course... I've included a few fixes in the attachment.
malloc() returns a char*, not a jbyte*.
[#1] byte addressable unit of data storage large enough to hold any member of the basic character set of the execution environment
[#2] NOTE 1 It is possible to express the address of each
individual byte of an object uniquely. [#3] NOTE 2 A byte is composed of a contiguous sequence of
bits, the number of which is implementation-defined. The
least significant bit is called the low-order bit; the most
significant bit is called the high-order bit. 3.5
[#1] character
bit representation that fits in a byte *
Do we actually have to deal with platforms that have non 8-bit chars? I guess quite a few other things/algorithms in the class library would break if it is so...
It's fine to be pedantic, but up to a point...
FYI: The JNI specification guarantees that jbyte is an 8-bit signed value.
Etienne
-- Etienne M. Gagnon, Ph.D. http://www.info.uqam.ca/~egagnon/ SableVM: http://www.sablevm.org/ SableCC: http://www.sablecc.org/
#include <jni.h> #include <stdio.h> #include <stdlib.h>
/*
* Class: JNITest
* Method: getPtr
* Signature: ()[B
*/
JNIEXPORT jbyteArray JNICALL
Java_JNITest_getPtr (JNIEnv * env, jclass class)
{
int *int_ptr;
jbyteArray nativePtr;
int_ptr = (int *) malloc (sizeof (int));;
*int_ptr = 0x47;
nativePtr = (*env)->NewByteArray (env, (jint) sizeof (int *));
if (nativePtr == NULL)
return NULL;
(*env)->SetByteArrayRegion (env, nativePtr, 0, (int) sizeof (int *),
(jbyte *) &int_ptr);
return nativePtr;
}
/*
* Class: JNITest
* Method: testPtr
* Signature: ([B)V
*/
JNIEXPORT void JNICALL
Java_JNITest_testPtr (JNIEnv * env, jclass class, jbyteArray nativePtr)
{
int *int_ptr;
(*env)->GetByteArrayRegion (env, nativePtr, 0, (jint) sizeof (int *),
(jbyte *) & int_ptr);
printf ("value = %x\n", *int_ptr);
}
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