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From: "Borneq" <borneq@antyspam.hidden.pl>
Newsgroups: comp.lang.java.programmer
Subject: Re: JNI and GetFieldID
Date: Fri, 6 Sep 2013 23:06:09 +0200
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Użytkownik "Steven Simpson" <ss@domain.invalid> napisał w wiadomości 
news:8bnpfa-417.ln1@s.simpson148.btinternet.com...
> Never learned to do that - looks too error-prone.  Instead of mucking 
> around in JNI, creating objects, accessing fields, etc, I prefer to do as 
> much as I can in Java, then declare the native methods as taking the 
> already dismantled fields as separate arguments.

But this is difficult, because I want to write JNI wrapper to UnACE - 
library for expanding .ace archives.
There are callbacks like
INT (__stdcall *StateCallbackProc)
                           (pACEStateCallbackProcStruc State);
where
 typedef union sACEStateCallbackProcStruc
                                       *pACEStateCallbackProcStruc;
typedef union sACEStateCallbackProcStruc
        {
          ULONG  StructureType;                 // indicates which of the 
fol-
                                                // lowing structures is used
          tACECallbackArchiveStruc      Archive;
          tACECallbackArchivedFileStruc ArchivedFile;
          tACECallbackRealFileStruc  RealFile;
          tACECallbackProgressStruc     Progress;
          tACECallbackCRCCheckStruc     CRCCheck;
        } tACEStateCallbackProcStruc;
where for example:
        typedef struct sACECallbackArchiveStruc
        {
          ULONG  StructureType;         // is ACE_CALLBACK_TYPE_ARCHIVE
          ULONG  Code;                  // see definition of
                                        // ACE_CALLBACK_TYPE_ARCHIVE
          ULONG  Operation;             // ACE_CALLBACK_OPERATION constant

          pACEGlobalDataStruc  GlobalData;      // see tACEGlobalDataStruc
          pACEArchiveDataStruc ArchiveData;     // see tACEArchiveDataStruc
        } tACECallbackArchiveStruc,
         *pACECallbackArchiveStruc;

There are structures reference inside other structures