JNA Structure as an other Structure field

Question

I want to use SYSTEMTIME struct as field of WFSRESULT struct. But when I try to init new object of WFSRESULT based on Pointer, then I got exception. There are my structures:

public class WFSRESULT extends Structure {

    public WFSRESULT() {

    }

    public WFSRESULT(Pointer p) {
        super(p);
        read();
    }

    public int RequestID;
    public short hService;
    public SYSTEMTIME tsTimestamp;
    public int hResult;
    public int dwCommandCode;
    public int dwEventID;
    public Pointer lpBuffer;

    @Override
    protected List getFieldOrder() {
        return Arrays.asList(new String[]{"RequestID", "hService", "tsTimestamp", "hResult", "dwCommandCode", "dwEventID", "lpBuffer"});
    }
}

    public class SYSTEMTIME extends Structure {

    public SYSTEMTIME() {
    }

    public short wYear;
    public short wMonth;
    public short wDayOfWeek;
    public short wDay;
    public short wHour;
    public short wMinute;
    public short wSecond;
    public short wMilliseconds;

    @Override
    protected List getFieldOrder() {
        return Arrays.asList(new String[]{"wYear", "wMonth", "wDayOfWeek", "wDay", "wHour", "wMinute", "wSecond", "wMilliseconds"});
    }
}

Initialization:

wfsResult = new WFS().new WFSRESULT(ipResult);

Exception (in super(p) line):

Exception in thread "main" java.lang.IllegalArgumentException: Invalid Structure field in class g60.wfs.WFS$WFSRESULT, field name 'tsTimestamp' (class g60.wfs.WFS$SYSTEMTIME): Can't instantiate class g60.wfs.WFS$SYSTEMTIME
    at com.sun.jna.Structure.validateField(Structure.java:1109)
    at com.sun.jna.Structure.validateFields(Structure.java:1119)
    at com.sun.jna.Structure.<init>(Structure.java:179)
    at com.sun.jna.Structure.<init>(Structure.java:172)
    at com.sun.jna.Structure.<init>(Structure.java:168)
    at g60.wfs.WFS$WFSRESULT.<init>(WFS.java:44)
    at g60.g60Handling.logMessage(g60Handling.java:132)
    at g60.g60Handling.runInitializationRoutine(g60Handling.java:117)
    at g60.g60Handling.<init>(g60Handling.java:56)
    at g60.g60Handling.main(g60Handling.java:40)
Caused by: java.lang.IllegalArgumentException: Can't instantiate class g60.wfs.WFS$SYSTEMTIME
    at com.sun.jna.Structure.newInstance(Structure.java:1781)
    at com.sun.jna.Structure.newInstance(Structure.java:1759)
    at com.sun.jna.Structure.size(Structure.java:1030)
    at com.sun.jna.Native.getNativeSize(Native.java:1172)
    at com.sun.jna.Structure.getNativeSize(Structure.java:2072)
    at com.sun.jna.Structure.getNativeSize(Structure.java:2062)
    at com.sun.jna.Structure.validateField(Structure.java:1105)
    ... 9 more
Caused by: java.lang.InstantiationException: g60.wfs.WFS$SYSTEMTIME
    at java.lang.Class.newInstance(Class.java:427)
    at com.sun.jna.Structure.newInstance(Structure.java:1773)
    ... 15 more
Caused by: java.lang.NoSuchMethodException: g60.wfs.WFS$SYSTEMTIME.<init>()
    at java.lang.Class.getConstructor0(Class.java:3082)
    at java.lang.Class.newInstance(Class.java:412)
    ... 16 more

score 0 · Answer 1 · answered Jan 29 '16 at 16:31

0

You need to make SYSTEMTIME static, or define it outside of WFSRESULT. Otherwise it always has an implicit reference to the surrounding WFSRESULT class, which JNA cannot generate automatically.

answered Jan 29 '16 at 16:31

technomage

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JNA Structure as an other Structure field

1 Answers1