JNA：指向的数组的结构：无效指针

我是新手到JNA和面临的一个问题相对于指针的映射JNA：指向的数组的结构：无效指针

本地方法：

EXTERNC T_PDU_ERROR PDUStartComPrimitive（UNUM32 HMOD， UNUM32 hCLL，T_PDU_COPT CopType，UNUM32 CoPDataSize，UNUM8
* pCopData，PDU_COP_CTRL_DATA * pCopCtrlData，无效* pCopTag，UNUM32 * phCoP）

JNA方法：

INT PDUStartComPrimitive（INT HMOD，INT hCLL，INT CoPType，整数
CoPDataSize，字节[] pCoPData，PDU_COP_CTRL_DATA.ByReference
pCopCtrlData，指针pCoPTag，IntByReference phCoP） ;

天然结构（S）：

typedef struct{ 
UNUM32 Time; 
SNUM32 NumSendCycles; 
SNUM32 NumReceiveCycles; 
UNUM32 TempParamUpdate; 
PDU_FLAG_DATA TxFlag; 
UNUM32 NumPossibleExpectedResponses; 
PDU_EXP_RESP_DATA *pExpectedResponseArray; 
}PDU_COP_CTRL_DATA; 

typedef struct{ 
UNUM32 ResponseType; 
UNUM32 AcceptanceId; 
UNUM32 NumMaskPatternBytes; 
UNUM8 *pMaskData; 
UNUM8 *pPatternData;  
UNUM32 NumUniqueRespIds; 
UNUM32 *pUniqueRespIds; 
}PDU_EXP_RESP_DATA;

JNA映射：

public class PDU_COP_CTRL_DATA extends Structure{  
    public int time;   
    public int numSendCycles;  
    public int numReceiveCycles;   
    public int tempParamUpdate;  
    public PDU_FLAG_DATA txFlag;   
    public int numPossibleExpectedResponses;   
    public Pointer pExpectedResponseArray;  
    public static class ByReference extends PDU_COP_CTRL_DATA implements  Structure.ByReference { 
    }; 
} 

public class PDU_EXP_RESP_DATA extends Structure{   
    public int responseType;   
    public int acceptanceId; 
    public int numMaskPatternBytes; 
    public byte[] pMaskData= new byte[1]; 
    public byte[] pPatternData = new byte[1]; 
    public int numUniqueRespIds; 
    /* Array containing unique response identifiers. Only responses with a unique response identifier found in this array are considered, when trying to match them to this expected response. */ 
    public Pointer pUniqueRespIds; 
    public static class ByReference extends PDU_EXP_RESP_DATA implements Structure.ByReference { 
    }; 
}

当我执行Java中的PDUStartComPrimitive方法，有一个看看underlyng DLL纪录我请参阅PDU_COP_CTRL_DATA strucutre字段* pExpectedResponseArray，我得到Invalid * PDU_EXP_RESP_DATA指针。

我JNA代码来设置PDUStartComPrimitive执行

 byte[] sendata = new byte[requestData.length()/2]; 

     int byteIndex = 0; 
     for (String byteString : requestData.split(" ")) { 
      sendata[byteIndex] = Byte.parseByte(byteString, 16); 
      byteIndex++; 
     } 
     /* Setting of the expected responses ends */ 

     PDU_COP_CTRL_DATA.ByReference objCopCtrlData = new PDU_COP_CTRL_DATA.ByReference(); 
     objCopCtrlData.numPossibleExpectedResponses = 1; 
     objCopCtrlData.numReceiveCycles = 1; 
     objCopCtrlData.numSendCycles = 1; 
     objCopCtrlData.tempParamUpdate = 0; 
     objCopCtrlData.time = 0; 


     PDU_EXP_RESP_DATA expRespStruct = new PDU_EXP_RESP_DATA(); 

     expRespStruct.acceptanceId = 0; 
     expRespStruct.numMaskPatternBytes = 1; 
     expRespStruct.numUniqueRespIds = 0; 
     expRespStruct.pUniqueRespIds = new Pointer(0); 
     expRespStruct.responseType = 0; 

     byte[] mskByte = byte int[] { 0 }; 
     byte[] patternByte = new byte[] { 0 }; 
     expRespStruct.pMaskData = mskByte; 
     expRespStruct.pPatternData = patternByte; 

     PDU_EXP_RESP_DATA[] refArr = (PDU_EXP_RESP_DATA[]) expRespStruct.toArray(1); 
     refArr[0] = expRespStruct; 

     expRespStruct.autoWrite(); 

     objCopCtrlData.pExpectedResponseArray = expRespStruct.getPointer(); 

     PDU_FLAG_DATA.ByValue objTxFlagData = new PDU_FLAG_DATA.ByValue();   
     objCopCtrlData.txFlag = objTxFlagData; 

     String strComAction = "SEND_RECV"; 
     Pointer apiTag = new NativeString(strComAction, true).getPointer(); 
     IntByReference phCop = new IntByReference(); 

     int errorCode = PDUStartComPrimitive(1, 1,0x8004, sendata.length,sendata, objCopCtrlData, apiTag, phCop);

我怀疑这可能是因为错误的JNA映射。你能帮我提出一些想法/建议吗？谢谢

来源

2012-11-22 Pramod

Structure内的原语数组被解释为内联数组，这会导致聚合（数组）类型的字段。您的本地结构表明这些字段的指针类型，因此您需要使用指针，指针类型或NIO缓冲区。

来源

2012-11-22 12:43:36 technomage

JNA：指向的数组的结构：无效指针

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