Accessing Java Member Array variables
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Posted By:   Anonymous
Posted On:   Monday, July 29, 2002 02:01 AM

Hi! Im working on a project that involves the use of JNI. My question goes this way. I have to call a C++ function that stores information on a parameter. m_pMedMp->GET_BalanceInfo(o_eBalanceAry); The function GET_BalanceInfo retrieves balance information and stores it in o_eBalanceAry. o_eBalanceAry is defined as structure whose definition is below. struct { unsigned char ucCategory; // (Category) unsigned char ucBalance[4]; // (Balance) } ENBalance; I made a java class that implements this struct.    More>>

Hi! Im working on a project
that involves the use of JNI.

My question goes this way. I have to call a C++ function that stores information
on a parameter.



				
m_pMedMp->GET_BalanceInfo(o_eBalanceAry);


The function GET_BalanceInfo
retrieves balance information and stores it in o_eBalanceAry. o_eBalanceAry
is defined as structure whose definition is below.



				
struct {

unsigned char ucCategory; // (Category)

unsigned char ucBalance[4]; // (Balance)

} ENBalance;


I made a java class that
implements this struct.



				
class ENBalance {

char ucCategory;

char ucBalance[];

/** Creates new ENBalance*/

public ENBalance() {

ucBalance = new char[4];

}

}


After that ive implemented
the JNI of the GET_BalanceInfo function. My problem is how do i access ENBalance's
member array variable ucBalance? I have no problems accessing and assigning
values to ucCategory. Here's the code


			
JNIEXPORT void JNICALL
Java_JmedMultiPockets_GET_1BalanceInfo (JNIEnv *env, jobject obj, jobject o_pBalanceAry){


				
jclass cls = env->GetObjectClass(o_pBalanceAry);

jfieldID fid;

ENCardInfo m_eCardInfo;

				
// C++ implementation
of Get Balance info here//

m_pMedMp->GET_BalanceInfo(o_eBalanceAry);



// setting of ENBalance on java class //

ucCategory fid = env->GetFieldID(cls, "ucCategory", "C");

if (fid != 0) {

env->SetCharField(obj, fid, o_eBalanceAry.ucCategory);


}


}

I hope to hear from anyone
soon. Thanks in advance!


Mao Ronan

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Re: Accessing Java Member Array variables

Posted By:   Gautam_Marwaha  
Posted On:   Monday, July 29, 2002 02:06 AM

Why not use String for balance?
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