例證一， 從c語言向JAVA傳遞類
/*
* Class: sms_SendSMS
* Method: ReceiveAllMessage
* Signature: (Lsms/SM_PARAM;)I
*/
JNIEXPORT jobjectArray JNICALL Java_sms_SendSMS_ReceiveAllMessage
(JNIEnv *env, jclass)
{
jobjectArray array=NULL; //定義數組對象
const int LEN = 30;
SM_PARAM *sm_param_temp=new SM_PARAM[LEN];
for(int j =0; j < LEN; j++)
{
sm_param_temp[j].TP_UD[0]='\0';
}
int temp=ReceiveAllMessage(sm_param_temp);
if(temp <= 0)
{
return array;
}
jclass cls = (env)->FindClass("sms/SM_PARAM");
array = env-> NewObjectArray(temp, cls, NULL);
for(int i=0; i< temp; i++)//,sm_param_temp++
{
if (cls != 0)
{
jmethodID mid = env->GetMethodID(cls,NULL,"()V");
if(mid != 0)
{
jobject obj = env->NewObject(cls,mid,0);
// env->FindClass("java/lang/String")
// jmethodID mid1 = env->GetMethodID(cls,"setContent","(Ljava/lang/String;)V");
jstring jstr = 0;
jfieldID TPA = env->GetFieldID(cls,"TPA","Ljava/lang/String;");
jstr = env->NewStringUTF(sm_param_temp->TPA);
env-> SetObjectField(obj, TPA, jstr);
env->ReleaseStringUTFChars(jstr, sm_param_temp->TPA);
jfieldID TP_SCTS = env->GetFieldID(cls,"TP_SCTS","Ljava/lang/String;");
jstr = env->NewStringUTF(sm_param_temp->TP_SCTS);
env-> SetObjectField(obj, TP_SCTS, jstr);
env->ReleaseStringUTFChars(jstr, sm_param_temp->TP_SCTS);
jfieldID TP_UD = env->GetFieldID(cls,"TP_UD","[B");
jbyteArray tpArray = env->NewByteArray(161);
for(int k=0; k<160; k++)
{
const signed char ch = sm_param_temp->TP_UD[k];
if(ch == '\0'){
break;
}
env->SetByteArrayRegion(tpArray, k, 1, &ch);
}
const signed char end = '\0';
env->SetByteArrayRegion(tpArray, 160, 1, &end);
env->SetObjectField(obj, TP_UD, tpArray);
// env->ReleaseByteArrayElements(tpArray, sm_param_temp->TP_UD, mode);
jchar ch = sm_param_temp->index;
jfieldID index = env->GetFieldID(cls,"index","C");
env-> SetCharField(obj, index, ch);
env->SetObjectArrayElement(array, i, obj);
}
}
}
delete[] sm_param_temp;
return array;
}
例證二， 從JAVA向c語言傳遞類
/*
* Class: sms_SendSMS
* Method: EncodePdu
* Signature: (Lsms/SM_PARAM;)Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_sms_SendSMS_EncodePdu
(JNIEnv *env, jclass, jobject src)
{
SM_PARAM *sm_param_temp=new SM_PARAM;
jclass cls = (env)->GetObjectClass(src);
if (cls != 0)
{
jfieldID TPA = env->GetFieldID(cls,"TPA","Ljava/lang/String;");
jstring jstr = (jstring) env->GetObjectField(src, TPA);
const char *temp;
jboolean copy='1';
temp = env->GetStringUTFChars(jstr, ©);
strcpy(sm_param_temp->TPA, temp);
// env->ReleaseStringUTFChars(jstr, sm_param_temp->TPA);
jfieldID TP_SCTS = env->GetFieldID(cls,"TP_SCTS","Ljava/lang/String;");
jstr = (jstring)env-> GetObjectField(src, TP_SCTS);
temp = env->GetStringUTFChars(jstr, ©);
strcpy(sm_param_temp->TP_SCTS, temp);
jfieldID SCA = env->GetFieldID(cls,"SCA","Ljava/lang/String;");
jstr = (jstring)env-> GetObjectField(src, SCA);
temp = env->GetStringUTFChars(jstr, ©);
strcpy(sm_param_temp->SCA, temp);
jfieldID TP_UD = env->GetFieldID(cls,"TP_UD","[B");
jbyteArray tpArray = (jbyteArray)env-> GetObjectField(src, TP_UD);
if(tpArray != NULL)
{
for(int k=0; k<env->GetArrayLength(tpArray); k++)
{
sm_param_temp->TP_UD[k]= *(env->GetByteArrayElements(tpArray, ©));
}
}
sm_param_temp->TP_UD[160] = '\0';
// env->ReleaseByteArrayElements(tpArray, sm_param_temp->TP_UD, mode);
jchar ch = 0;
jfieldID index = env->GetFieldID(cls,"index","C");
sm_param_temp->index = (char)env->GetCharField(src, index);
jfieldID TP_PID = env->GetFieldID(cls,"TP_PID","C");
sm_param_temp->TP_PID = (char)env->GetCharField(src, TP_PID);
jfieldID TP_DCS = env->GetFieldID(cls,"TP_DCS","C");
sm_param_temp->TP_DCS = (char)env->GetCharField(src, TP_DCS);
}
char *dst = new char[400];
int rValue = EncodePdu(sm_param_temp, dst);
jstring jstr = 0;
jstr = env->NewStringUTF(dst);
delete sm_param_temp;
delete[] dst;
return jstr;
}