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I've got a problem: I must use an int java array in a C code. Using JNI
i wrote this code:

jsize len = (*env)->GetArrayLength(env, payload); //payload is the
name of java array
jint *body = (*env)->GetIntArrayElements(env, payload, 0);
int cpayload [len]; // C array
int i;
for (i=0; i<len; i++)
{
cpayload[i] = body[i]; // copying the java array value into C array
value
}

input.d_ip=0;
input.data_size=len;
input.data=(u_char)*body; //here there is the error

the compiler says this:
warning: assignment makes pointer from integer without a cast

P.S. data is define in this way:
u_char *data;

andrea_ wrote:
> I've got a problem: I must use an int java array in a C code. Using JNI
> i wrote this code:
>
> jsize len = (*env)->GetArrayLength(env, payload); //payload is the
> name of java array
> jint *body = (*env)->GetIntArrayElements(env, payload, 0);
> int cpayload [len]; // C array
> int i;
> for (i=0; i<len; i++)
> {
> cpayload[i] = body[i]; // copying the java array value into C array
> value
> }
>
> input.d_ip=0;
> input.data_size=len;
> input.data=(u_char)*body; //here there is the error
>
> the compiler says this:
> warning: assignment makes pointer from integer without a cast
>
> P.S. data is define in this way:
> u_char *data;
>

The cast is wrong; write:

input.data=(u_char *)body;

Zara wrote:
> andrea_ wrote:
>
>>I've got a problem: I must use an int java array in a C code. Using JNI
>>i wrote this code:
>>
>> jsize len = (*env)->GetArrayLength(env, payload); //payload is the
>>name of java array
>> jint *body = (*env)->GetIntArrayElements(env, payload, 0);

<snip>

>> input.data=(u_char)*body; //here there is the error
>>
>> the compiler says this:
>> warning: assignment makes pointer from integer without a cast
>>
>> P.S. data is define in this way:
>> u_char *data;
>
> The cast is wrong; write:
>
> input.data=(u_char *)body;

That will get rid of the warning and, assuming u_char is a typedef for
unsigned char is completely valid as far as C is concerned. However I
would suggest the OP ask somewhere where the JNI is on topic to see if
this is the right was to access a Java int array. Since the J in JNI
stands for Java I would suggest a group with java in the name, possible
comp.lang.java.programmer, but check *their* FAQ, charter and a load of
posts to see what goes on there before posting.
--
Flash Gordon
Living in interesting times.
Although my email address says spam, it is real and I read it.