converting jbytearray to unsigned char array

[marydeepthy]

Hi,

i have a native method, as folowws:

JNIEXPORT jobjectArray JNICALL l2cap_L2CAPImpl_L2CAOpen
(JNIEnv *env, jobject obj, jbyteArray dev, jstring service, jboolean
auth, jboolean crypt)
{
unsigned char address[6];

}


the value of address is the same as jbyteArray dev, which is passed
from the java program. i have to convert the jbytearray to this char
array. how can i do this. i am completely new to JNI and this native
calls are only a small part of my big project..so please do help me...

 

[Joan]

Hi,

i have a native method, as folowws:

JNIEXPORT jobjectArray JNICALL l2cap_L2CAPImpl_L2CAOpen
(JNIEnv *env, jobject obj, jbyteArray dev, jstring service,
jboolean
auth, jboolean crypt)
{
unsigned char address[6];

}


the value of address is the same as jbyteArray dev, which is
passed
from the java program. i have to convert the jbytearray to this
char
array. how can i do this. i am completely new to JNI and this
native
calls are only a small part of my big project..so please do
help me...

SUN has a tutorial on this, take a look.

 

[Gordon Beaton]

i have to convert the jbytearray to this char array. how can i do
this.

GetByteArrayElements() and (important!) ReleaseByteArrayElements().

These and other functions are described in the Array Operations
section of the JNI spec.

/gordon

 

[Roedy Green]

These and other functions are described in the Array Operations
section of the JNI spec.

I suggest getting a text book to explain these. Understanding them
from the raw spec are for the types who like to eat nails for
breakfast.

See http://mindprod.com/jgloss/jni.html

 

[Boudewijn Dijkstra]

I suggest getting a text book to explain these. Understanding them
from the raw spec are for the types who like to eat nails for
breakfast.

Hmm, sounds like I should try eating nails for breakfast.