У меня есть SDK с библиотеками DLL.Я вызываю библиотеки из Java 1.8 и JNA v3.0.9 У меня возникают проблемы с определением структур
В документации SDK говорится:
Вызов NET_DVR_STDXMLConfig для прохождения через URL запроса: GET/ ISAPI / AccessControl / UserInfo /abilities? Format = json для получения возможности управления персоналом узнать подробности и уведомления о конфигурации.
NET_DVR_STDXMLConfig Определение вызова API:
BOOL NET_DVR_STDXMLConfig(
LONG lUserID,
NET_DVR_XML_CONFIG_INPUT *lpInputParam,
NET_DVR_XML_CONFIG_OUTPUT *lpOutputParam
);
lpInputParam
[IN] Input parameters, refer to the structure NET_DVR_XML_CONFIG_INPUT for details.
lpOutputParam
[IN/OUT] Output parameters, refer to the structure NET_DVR_XML_CONFIG_OUTPUT for details.
Определение структуры NET_DVR_XML_CONFIG_INPUT:
struct{
DWORD dwSize;
void *lpRequestUrl;
DWORD dwRequestUrlLen;
void *lpInBuffer;
DWORD dwInBufferSize;
DWORD dwRecvTimeOut;
BYTE byForceEncrpt;
BYTE byNumOfMultiPart;
BYTE byRes[30];
}
dwSize
Structure size.
lpRequestUrl
Request URL (command) for implement different functions, and it is in string format.
dwRequestUrlLen
Request URL size.
lpInBuffer
Buffer for storing input parameters (request messages), see the input content details structure in NET_DVR_MIME_UNIT.
dwInBufferSize
Input buffer size.
dwRecvTimeOut
Receiving timeout, unit: ms, 0-5000ms (default).
byForceEncrpt
Whether to enable force encryption (the messages will be encrypted by AES algorithm for transmission): 0-no, 1-yes.
byNumOfMultiPart
Number of message segments: 0-invalid; other values-number of message segments, which is transmitted by the parameter lpInBuffer in the structure NET_DVR_MIME_UNIT.
Определение структуры NET_DVR_MIME_UNIT:
struct{
char szContentType[32];
char szName[MAX_FILE_PATH_LEN/*256*/];
char szFilename[MAX_FILE_PATH_LEN/*256*/];
DWORD dwContentLen;
char* pContent;
BYTE byRes[16];
}
szContentType
Content type (corresponds to Content-Type field in the message), e.g., text/json. text/xml, and so on. The content format must be supported by HTTP.
zName
Content name (corresponds to name field in the message), e.g., name="upload".
szFilename
Content file name (corresponds to filename field in the message), e.g., filename="C:\Users\test\Desktop\11.txt".
dwContentLen
Content size.
pContent
Data point.
И это то, что я до сих пор делал в Java: вызов DLL и определение структуры
//DLL native call
boolean NET_DVR_STDXMLConfig(int lUserID, Pointer lpInputParam, Pointer lpOutputParam);
public static class NET_DVR_XML_CONFIG_INPUT extends Structure
{
public int dwSize;
public Pointer lpRequestUrl;
public int dwRequestUrlLen;
public Pointer lpInBuffer;
public int dwInBufferSize;
public int dwRecvTimeOut;
public byte byForceEncrpt;
public byte byNumOfMultiPart;
public byte[] byRes = new byte[30];
@Override
protected List<String> getFieldOrder() {
return Arrays.asList("dwSize", "lpRequestUrl", "dwRequestUrlLen", "lpInBuffer", "dwInBufferSize",
"dwRecvTimeOut","byForceEncrpt","byNumOfMultiPart", "byRes");
}
}
public static class NET_DVR_XML_CONFIG_OUTPUT extends Structure {
public int dwSize;
public Pointer lpOutBuffer;
public int dwOutBufferSize;
public int dwReturnedXMLSize;
public Pointer lpStatusBuffer;
public int dwStatusSize;
public byte[] byRes = new byte[32];
@Override
protected List<String> getFieldOrder() {
return Arrays.asList("dwSize", "lpOutBuffer",
"dwOutBufferSize", "dwReturnedXMLSize", "lpStatusBuffer",
"dwStatusSize", "byRes");
}
}
public static class NET_DVR_MIME_UNIT extends Structure{
public byte[] szContentType = new byte[32];
public byte[] szName = new byte[MAX_FILE_PATH_LEN];
public byte[] szFilename = new byte[MAX_FILE_PATH_LEN];
public int dwContentLen;
public String pContent;
public byte[] byRes = new byte[16];
@Override
protected List<String> getFieldOrder() {
return Arrays.asList("szContentType", "szName", "szFilename", "dwContentLen", "pContent","byRes");
}
}
И это мой библиотечный вызов
NET_DVR_XML_CONFIG_INPUT struInput = new NET_DVR_XML_CONFIG_INPUT();
NET_DVR_XML_CONFIG_OUTPUT struOuput = new NET_DVR_XML_CONFIG_OUTPUT();
String strInput = new String("GET /ISAPI/AccessControl/UserInfo/capabilities?format=json\r\n\"");
byte[] byInput = strInput.getBytes();
System.arraycopy(byInput, 0, struInput.lpRequestUrl, 0, byInput.length); // Nullpointer exception
struInput.dwRequestUrlLen = byInput.length;
NET_DVR_MIME_UNIT mimeUnit = new NET_DVR_MIME_UNIT();
//mimeUnit.pContent = new Memory(MAX_XML_CONFIG_LEN); // Dont know what to put in here
struInput.lpInBuffer = mimeUnit.getPointer();
struOuput.dwOutBufferSize = MAX_XML_CONFIG_LEN;
struOuput.dwStatusSize = struOuput.dwOutBufferSize;
struInput.write();
struOuput.write();
NET_DVR_STDXMLConfig(userID,struInput.getPointer(), struOuput.getPointer()); // Getting a generic "parameters not valid" error msg
Я не уверен насчет своих структур.Я получаю нулевой указатель при установке requestURL. Также мой вызов возвращает общее сообщение об ошибке «параметры не действительны».
Любая помощь, высоко ценимая.
Заранее спасибо