C结构体与JAVA类的相互转换

在JNI操作中最多见的即为从c/c++中获取结构体和设置java信息到结构体中功能，具体实现例子如下。

C 结构体如下typedef struct _NPC_S_PVM_IMD_CFG_DEV_RECORD_PLAN{    NPC_INT                                     iChNo;                              NPC_INT                                     iRecState;                          NPC_INT                                     iPacketLength;                      NPC_INT                                     iPreRecord;                         NPC_BOOL                                    bOpenAudio;                         NPC_INT                                     iRecStream;                         NPC_BOOL                                    bOpenGeneral;                       NPC_BOOL                                    bOpenCheckAlarm;                    NPC_BOOL                                    bOpenInputAlarm;                    struct _WeekSect{        struct _TimeSect{            NPC_BOOL                            bOpenGeneral;                               NPC_BOOL                            bOpenCheckAlarm;                            NPC_BOOL                            bOpenInputAlarm;                            NPC_S_TD_TIME                       tBeginTime;                                 NPC_S_TD_TIME                       tEndTime;                               } tTimeSect[NPC_D_PVM_CFG_REC_PLAN_TIME_SECT_NUM];    } tWeekSect[7];    NPC_CHAR                                    sRecordMode[32];                     NPC_BOOL                                    bRedundancy;                     } NPC_S_PVM_IMD_CFG_DEV_RECORD_PLAN, *PNPC_S_PVM_IMD_CFG_DEV_RECORD_PLAN;JAVA类对应如下 位于  com/player/source/下public class TDevRecordPlanEx {   public int iChNo;    public int iRecState;   public int iPacketLength;   public int iPreRecord;      public int iRecStream;   public int bOpenAudio;     public boolean bOpenGeneral;      public boolean bOpenCheckAlarm;    public boolean bOpenInputAlarm;   public String   sRecordMode;      public boolean  bRedundancy;     public TDevRecordPlanExWeekSect [] tDevRecordPlanExWeekSects = new TDevRecordPlanExWeekSect[7]; }/*子类，数组*/public class TDevRecordPlanExWeekSect {    public TDevRecordPlanExTimeSect[] tTimeSect = new  TDevRecordPlanExTimeSect[6];}/*子类*/public class TDevRecordPlanExTimeSect {    public  boolean                      bOpenGeneral;                  public  boolean                      bOpenCheckAlarm;                public  boolean                      bOpenInputAlarm;                public  TDateTime                 tBeginTime;                public  TDateTime                 tEndTime;                               }/*时间类*/public final class TDateTime implements Serializable {   private static final long serialVersionUID = -5238783596803259572L;   public int iYear; // 年   public int iMonth; // 月   public int iDay; // 日   public int iHour; // 时   public int iMinute; // 分   public int iSecond; // 秒   public int iMinsecond; // 毫秒   public int iweek;// 周 1-7 week=1为星期日，week=7为星期六   @Override   public String toString() {      return "TDateTime [iYear=" + iYear + ", iMonth=" + iMonth + ", iDay="            + iDay + ", iHour=" + iHour + ", iMinute=" + iMinute            + ", iSecond=" + iSecond + ", iMinsecond=" + iMinsecond            + ", iweek=" + iweek + "]";JNI获取设置如下（c结构体至JAVA)JNIEXPORT jint JNICALL Java_com_stream_NewAllStreamParser_CameraGetDevRecordPlan(JNIEnv* env, jclass clazz, jint pMONCamera, jint in_jiChNo, jobject out_joCfgObjDevRecordPlan){NPC_I_MPI_MON_Camera* pCamera;PNPC_S_PVM_IMD_CFG_DEV_RECORD_PLAN pCfgBody = NULL;NPC_INT iCfgBodyLen = 0;NPC_S_PVM_IMD_CFG_DEV_RECORD_PLAN tCfgBody = {0};pCamera = (NPC_I_MPI_MON_Camera*)((jint*)pMONCamera);if ( pCamera == NULL )return 99;tCfgBody.iChNo = in_jiChNo;//---------------------------------------------------------------------------//获取配置，返回0：表示成功，其它表示失败if ( pCamera->NPC_F_MPI_MON_Camera_GetConfig(NPC_D_PVM_CFG_FUNCID_DEV_RECORD_PLAN,(PNPC_BYTE)&tCfgBody,sizeof(tCfgBody),(PNPC_BYTE*)&pCfgBody,&iCfgBodyLen) != 0 ){return 2;}if ( pCfgBody == NULL ){return 3;}if ( iCfgBodyLen != (NPC_INT)sizeof(NPC_S_PVM_IMD_CFG_DEV_RECORD_PLAN) ){//释放数据缓冲区，由底层分配的缓冲区pCamera->NPC_F_MPI_MON_Camera_ReleaseBuf((PNPC_BYTE)pCfgBody//[IN]缓冲区，由底层分配的缓冲区);pCfgBody = NULL;return 4;}//---------------------------------------------------------------------------BS_SetObjectFieldValue_Int(env, out_joCfgObjDevRecordPlan, "iChNo", pCfgBody->iChNo);BS_SetObjectFieldValue_Int(env, out_joCfgObjDevRecordPlan, "iRecState", pCfgBody->iRecState);BS_SetObjectFieldValue_Int(env, out_joCfgObjDevRecordPlan, "iPacketLength", pCfgBody->iPacketLength);BS_SetObjectFieldValue_Int(env, out_joCfgObjDevRecordPlan, "iPreRecord", pCfgBody->iPreRecord);BS_SetObjectFieldValue_Int(env, out_joCfgObjDevRecordPlan, "bOpenAudio", pCfgBody->bOpenAudio);BS_SetObjectFieldValue_Int(env, out_joCfgObjDevRecordPlan, "iRecStream", pCfgBody->iRecStream);BS_SetObjectFieldValue_Boolean(env, out_joCfgObjDevRecordPlan, "bOpenGeneral", pCfgBody->bOpenGeneral);BS_SetObjectFieldValue_Boolean(env, out_joCfgObjDevRecordPlan, "bOpenCheckAlarm", pCfgBody->bOpenCheckAlarm);BS_SetObjectFieldValue_Boolean(env, out_joCfgObjDevRecordPlan, "bOpenInputAlarm", pCfgBody->bOpenInputAlarm);    BS_SetObjectFieldValue_String(env, out_joCfgObjDevRecordPlan, "sRecordMode", pCfgBody->sRecordMode);    BS_SetObjectFieldValue_Boolean(env, out_joCfgObjDevRecordPlan, "bRedundancy", pCfgBody->bRedundancy);/*循环读取，赋值*/jclass objectClass = (env)->GetObjectClass(out_joCfgObjDevRecordPlan);//TDevRecordPlanExWeekSect类jfieldID arrayfieldIdWeek= (env)->GetFieldID(objectClass,"tDevRecordPlanExWeekSects","[Lcom/Player/Source/TDevRecordPlanExWeekSect;"); //TDevRecordPlanExWeekSect 里面tDevRecordPlanExWeekSects数组变量IDjclass jcWeekSect = (env)->FindClass("com/Player/Source/TDevRecordPlanExWeekSect");//tDevRecordPlanExWeekSects类     jobjectArray obj_arrayWeekSect = (env)->NewObjectArray(6, jcWeekSect, NULL);jclass jcTimeSect = (env)->FindClass("com/Player/Source/TDevRecordPlanExTimeSect");//获取tTimeSect对象jfieldID arrayfieldTime= (env)->GetFieldID(jcWeekSect,"tTimeSect","[Lcom/Player/Source/TDevRecordPlanExTimeSect;"); //TDevRecordPlanExTimeSect 里面tTimeSect数组变量IDjclass jcDateTime = (env)->FindClass("com/Player/Source/TDateTime");//获取tDateTime对象jfieldID fieldBeginTime = (env)->GetFieldID(jcTimeSect,"tBeginTime","Lcom/Player/Source/TDateTime;"); //TDevRecordPlanExTimeSect 里面beginTime    jfieldID fieldEndTime = (env)->GetFieldID(jcTimeSect,"tEndTime","Lcom/Player/Source/TDateTime;"); //TDevRecordPlanExTimeSect 里面beginTimeif((pCfgBody->tWeekSect) != NULL){for(int i = 0 ; i < 6 ;i++){if((pCfgBody->tWeekSect[i].tTimeSect) != NULL){jobject obj_weekSect = (env)->AllocObject(jcWeekSect);//实例化类对象jobjectArray obj_arrayTimeSect = (env)->NewObjectArray(7, jcTimeSect, NULL);for(int j = 0;j < 7 ; j++){jobject obj_TimeSect = (env)->AllocObject(jcTimeSect);/*布放设置*/BS_SetObjectFieldValue_Boolean(env,obj_TimeSect,"bOpenGeneral",pCfgBody->tWeekSect[i].tTimeSect[j].bOpenGeneral);BS_SetObjectFieldValue_Boolean(env,obj_TimeSect,"bOpenCheckAlarm",pCfgBody->tWeekSect[i].tTimeSect[j].bOpenCheckAlarm);BS_SetObjectFieldValue_Boolean(env,obj_TimeSect,"bOpenInputAlarm",pCfgBody->tWeekSect[i].tTimeSect[j].bOpenInputAlarm);/*时间设置*/    jobject beginTime = (env)->AllocObject(jcDateTime);    jobject endTime = (env)->AllocObject(jcDateTime);BS_SetObjectFieldValue_Int(env, beginTime, "iHour", pCfgBody->tWeekSect[i].tTimeSect[j].tBeginTime.ucHour);BS_SetObjectFieldValue_Int(env, beginTime, "iMinute", pCfgBody->tWeekSect[i].tTimeSect[j].tBeginTime.ucMin);BS_SetObjectFieldValue_Int(env, beginTime, "iSecond", pCfgBody->tWeekSect[i].tTimeSect[j].tBeginTime.ucSec);BS_SetObjectFieldValue_Int(env, endTime, "iHour", pCfgBody->tWeekSect[i].tTimeSect[j].tEndTime.ucHour);BS_SetObjectFieldValue_Int(env, endTime, "iMinute", pCfgBody->tWeekSect[i].tTimeSect[j].tEndTime.ucMin);BS_SetObjectFieldValue_Int(env, endTime, "iSecond", pCfgBody->tWeekSect[i].tTimeSect[j].tEndTime.ucSec);env->SetObjectField(obj_TimeSect,fieldBeginTime,beginTime);//对obj_TimeSect中begin time属性进行赋值env->SetObjectField(obj_TimeSect,fieldEndTime,endTime);//对obj_TimeSect中begin time属性进行赋值/*设置数组值*/env->SetObjectArrayElement(obj_arrayTimeSect,j,obj_TimeSect);//给timeSect中某个元素赋值}env->SetObjectField(obj_weekSect,arrayfieldTime,obj_arrayTimeSect);//对obj_weekSect中tTimeSect属性进行赋值(env)->SetObjectArrayElement(obj_arrayWeekSect, i, obj_weekSect);//给weekSect某个元素进行赋值}}}    (env)->SetObjectField(out_joCfgObjDevRecordPlan,arrayfieldIdWeek,obj_arrayWeekSect);//设置objectClass中tWeekSect赋值env->DeleteLocalRef(objectClass);//释放jclassenv->DeleteLocalRef(jcWeekSect);//释放jclassenv->DeleteLocalRef(jcTimeSect);//释放jclassenv->DeleteLocalRef(jcDateTime);//释放jclass//释放数据缓冲区，由底层分配的缓冲区pCamera->NPC_F_MPI_MON_Camera_ReleaseBuf((PNPC_BYTE)pCfgBody//[IN]缓冲区，由底层分配的缓冲区);pCfgBody = NULL;return 0;}设置如下（java类至c结构体）*/JNIEXPORT jint JNICALL Java_com_stream_NewAllStreamParser_CameraSetDevRecordPlan(JNIEnv* env, jclass clazz, jint pMONCamera, jobject in_joCfgObjDevRecordPlan){NPC_I_MPI_MON_Camera* pCamera;NPC_S_PVM_IMD_CFG_DEV_RECORD_PLAN tCfgBody = {0};pCamera = (NPC_I_MPI_MON_Camera*)((jint*)pMONCamera);if ( pCamera == NULL){return 99;}if( in_joCfgObjDevRecordPlan == NULL){return 98;}tCfgBody.iChNo = BS_GetObjectFieldValue_Int(env, in_joCfgObjDevRecordPlan, "iChNo");tCfgBody.iRecState = BS_GetObjectFieldValue_Int(env, in_joCfgObjDevRecordPlan, "iRecState");tCfgBody.iPacketLength = BS_GetObjectFieldValue_Int(env, in_joCfgObjDevRecordPlan, "iPacketLength");tCfgBody.iPreRecord = BS_GetObjectFieldValue_Int(env, in_joCfgObjDevRecordPlan, "iPreRecord");tCfgBody.bOpenAudio = BS_GetObjectFieldValue_Int(env, in_joCfgObjDevRecordPlan, "bOpenAudio");tCfgBody.iRecStream = BS_GetObjectFieldValue_Int(env, in_joCfgObjDevRecordPlan, "iRecStream");tCfgBody.bOpenGeneral =    BS_GetObjectFieldValue_Boolean(env, in_joCfgObjDevRecordPlan, "bOpenGeneral");tCfgBody.bOpenCheckAlarm = BS_GetObjectFieldValue_Boolean(env, in_joCfgObjDevRecordPlan, "bOpenCheckAlarm");tCfgBody.bOpenInputAlarm = BS_GetObjectFieldValue_Boolean(env, in_joCfgObjDevRecordPlan, "bOpenInputAlarm");/*雄迈属性*/BS_GetObjectFieldValue_String(env, in_joCfgObjDevRecordPlan, "sRecordMode", tCfgBody.sRecordMode, sizeof(tCfgBody.sRecordMode));tCfgBody.bRedundancy = BS_GetObjectFieldValue_Boolean(env,in_joCfgObjDevRecordPlan,"bRedundancy");jclass objectClass = (env)->GetObjectClass(in_joCfgObjDevRecordPlan);//TDevRecordPlanExWeekSect类,通过object 获取classjfieldID arrayfieldIdWeek= (env)->GetFieldID(objectClass,"tDevRecordPlanExWeekSects","[Lcom/Player/Source/TDevRecordPlanExWeekSect;"); //TDevRecordPlanExWeekSect 里面tDevRecordPlanExWeekSects数组变量IDjclass jcWeekSect = (env)->FindClass("com/Player/Source/TDevRecordPlanExWeekSect");//tDevRecordPlanExWeekSects类     jobjectArray obj_arrayWeekSect = (jobjectArray)(env->GetObjectField(in_joCfgObjDevRecordPlan,arrayfieldIdWeek)); ;jclass jcTimeSect = (env)->FindClass("com/Player/Source/TDevRecordPlanExTimeSect");//获取tTimeSect对象jfieldID arrayfieldTime= (env)->GetFieldID(jcWeekSect,"tTimeSect","[Lcom/Player/Source/TDevRecordPlanExTimeSect;"); //TDevRecordPlanExTimeSect 里面tTimeSect数组变量IDjclass jcDateTime = (env)->FindClass("com/Player/Source/TDateTime");//获取tDateTime对象jfieldID fieldBeginTime = (env)->GetFieldID(jcTimeSect,"tBeginTime","Lcom/Player/Source/TDateTime;"); //TDevRecordPlanExTimeSect 里面beginTime    jfieldID fieldEndTime = (env)->GetFieldID(jcTimeSect,"tEndTime","Lcom/Player/Source/TDateTime;"); //TDevRecordPlanExTimeSect 里面beginTimeif(obj_arrayWeekSect != NULL){for(int i = 0 ; i < 6; i++){jobject joWeekSect = env->GetObjectArrayElement(obj_arrayWeekSect,i);jobjectArray joArrayTimeSect =(jobjectArray)(env->GetObjectField(joWeekSect,arrayfieldTime));if(joArrayTimeSect != NULL){for(int j = 0;j < 7; j++){jobject joTimeSeck = env->GetObjectArrayElement(joArrayTimeSect,j);tCfgBody.tWeekSect[i].tTimeSect[j].bOpenGeneral = (NPC_BOOL)BS_GetObjectFieldValue_Boolean(env,joTimeSeck,"bOpenGeneral");tCfgBody.tWeekSect[i].tTimeSect[j].bOpenCheckAlarm = (NPC_BOOL)BS_GetObjectFieldValue_Boolean(env,joTimeSeck,"bOpenCheckAlarm");tCfgBody.tWeekSect[i].tTimeSect[j].bOpenInputAlarm = (NPC_BOOL)BS_GetObjectFieldValue_Boolean(env,joTimeSeck,"bOpenInputAlarm");/*时间赋值*/jobject beginTime =  env->GetObjectField(joTimeSeck,fieldBeginTime);jobject endTime =  env->GetObjectField(joTimeSeck,fieldEndTime);tCfgBody.tWeekSect[i].tTimeSect[j].tBeginTime.ucHour = BS_GetObjectFieldValue_Int(env,beginTime,"iHour");tCfgBody.tWeekSect[i].tTimeSect[j].tBeginTime.ucMin = BS_GetObjectFieldValue_Int(env,beginTime,"iMinute");tCfgBody.tWeekSect[i].tTimeSect[j].tBeginTime.ucSec = BS_GetObjectFieldValue_Int(env,beginTime,"iSecond");    tCfgBody.tWeekSect[i].tTimeSect[j].tEndTime.ucHour = BS_GetObjectFieldValue_Int(env,endTime,"iHour");tCfgBody.tWeekSect[i].tTimeSect[j].tEndTime.ucMin = BS_GetObjectFieldValue_Int(env,endTime,"iMinute");tCfgBody.tWeekSect[i].tTimeSect[j].tEndTime.ucSec = BS_GetObjectFieldValue_Int(env,endTime,"iSecond");}}}}env->DeleteLocalRef(objectClass);//释放jclassenv->DeleteLocalRef(jcWeekSect);//释放jclassenv->DeleteLocalRef(jcTimeSect);//释放jclassenv->DeleteLocalRef(jcDateTime);//释放jclassreturn pCamera->NPC_F_MPI_MON_Camera_SetConfig(NPC_D_PVM_CFG_FUNCID_DEV_RECORD_PLAN,//[IN]配置功能ID，参见NPC_D_PVM_CFG_FUNCID_*定义(PNPC_BYTE)&tCfgBody,//[IN]配置数据缓冲区，配置数据结构参见NPC_PVM_OrderCfgDef.h文件中的定义sizeof(tCfgBody)//[IN]配置数据长度);}