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Showing content from https://github.com/bytedeco/javacpp/discussions/528 below:

Addressing arrays of structs within structs · bytedeco/javacpp · Discussion #528 · GitHub

Hi,
I got a C header file with following complex structure:

typedef struct iodbctpr {
    struct {
        long    acc_bipl[MAX_AXIS];
        long    acc_chg_time;
        /* ... */
    } data;
    struct {
        short   datano;
        short   type;
        union {
            char    cdata;
            short   idata;
            long    ldata;
            char    cdatas[MAX_AXIS];
            /* ... */
        } u;
    } prm[2];
} IODBCTPR;

Javacpp generates the following ...

public class IODBCTPR extends Pointer {
    static { Loader.load(); }
    /** Default native constructor. */
    public IODBCTPR() { super((Pointer)null); allocate(); }
    /** Native array allocator. Access with {@link Pointer#position(long)}. */
    public IODBCTPR(long size) { super((Pointer)null); allocateArray(size); }
    /** Pointer cast constructor. Invokes {@link Pointer#Pointer(Pointer)}. */
    public IODBCTPR(Pointer p) { super(p); }
    private native void allocate();
    private native void allocateArray(long size);
    @Override public IODBCTPR position(long position) {
        return (IODBCTPR)super.position(position);
    }
    @Override public IODBCTPR getPointer(long i) {
        return new IODBCTPR((Pointer)this).offsetAddress(i);
    }

        @Name("data.acc_bipl") public native long data_acc_bipl(int i); public native IODBCTPR data_acc_bipl(int i, long setter);
        @Name("data.acc_bipl") @MemberGetter public native CLongPointer data_acc_bipl();
        @Name("data.acc_chg_time") public native long data_acc_chg_time(); public native IODBCTPR data_acc_chg_time(long setter);
        /* ... */
        @Name({"prm", ".datano"}) public native short prm_datano(int i); public native IODBCTPR prm_datano(int i, short setter);
        @Name({"prm", ".type"}) public native short prm_type(int i); public native IODBCTPR prm_type(int i, short setter);
            @Name("prm.u.cdata") public native @Cast("char") byte prm_u_cdata(); public native IODBCTPR prm_u_cdata(byte setter);
            @Name("prm.u.idata") public native short prm_u_idata(); public native IODBCTPR prm_u_idata(short setter);
            @Name("prm.u.ldata") public native long prm_u_ldata(); public native IODBCTPR prm_u_ldata(long setter);
            @Name("prm.u.cdatas") public native @Cast("char") byte prm_u_cdatas(int i); public native IODBCTPR prm_u_cdatas(int i, byte setter);
            @Name("prm.u.cdatas") @MemberGetter public native @Cast("char*") BytePointer prm_u_cdatas();
        /* ... */
}

... and

static int JavaCPP_offsets[1][154] = {
        { sizeof(Fwlib32::IODBCTPR), offsetof(Fwlib32::IODBCTPR, data.jerk_acc_diff_lin), offsetof(Fwlib32::IODBCTPR, data.acc_chg_time), offsetof(Fwlib32::IODBCTPR, prm), offsetof(Fwlib32::IODBCTPR, prm.u.cdata), offsetof(Fwlib32::IODBCTPR, prm.u.idata), offsetof(Fwlib32::IODBCTPR, prm.u.ldata), offsetof(Fwlib32::IODBCTPR, prm.u.cdatas)}};

Since accessing the member prm requires an index like prm[0]

• the generated file jni....cpp doesn't compile:

error: request for member ‘u’ in
‘((Fwlib32::IODBCTPR*)0)->Fwlib32::iodbctpr::prm’, which is of non-class type ‘Fwlib32::iodbctpr::<unnamed struct> [2]’`
* the generated Java code (see _jniOdbctpr.cpp.txt_) accesses only the first element of the array `prm`.

Is there any idea how to setup the parser to generate the correct code? (What entry in the InfoMap.map(InfoMap infoMap) can be added to solve the problem?)

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