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Subject: Re: Book design

Author: Matthias Gemuh

Date: 15:39:08 11/28/02

Go up one level in this thread

On November 28, 2002 at 16:54:16, Sune Fischer wrote:

>On November 28, 2002 at 13:21:14, Matthias Gemuh wrote:
>>My book record is
>>typedef struct {
>>    unsigned long HashKey, HashLock;
>>    CHESSMOVE Move;
>>    int Result, lrnResult;
>>    unsigned int Count;
>Do you know of a clever way to print such a struct binary to a file, and read it
>back in?

By taking a look at this memory mapped read/write (Borland C++ Builder 5),
you should be able to read and dump BigLion's book. Note the meaning of first
bytes in book.

typedef unsigned long CHESSMOVE;
//unsigned long Move Bits (from high to low): nSideMoving=1, nPieceNr=3,
nFrom=6, nTo=6, nCapturedNr=3, promo=3, CastleRights=4(C8G8C1G1), ep=6

void InsertBookEntry(TMemoryStream* pMemFile, BOOKENTRY bk)
    int i, j, k, nGameResult;
    unsigned long nCount=0, Offset1, Offset2, nMove;
    BOOKENTRY tmpbk;

    pMemFile->Position = 0;
    pMemFile->Read((void *)(unsigned long *)&nCount, sizeof(unsigned long));
    Offset1 = pMemFile->Position;
    pMemFile->Read((void *)(unsigned long *)&Offset2, sizeof(unsigned long));
    pMemFile->Position = Offset2;
    if (nCount) {
        for (int i= 0; i < nCount; i++) {
            Offset1 = pMemFile->Position;
            pMemFile->Read((void *)(BOOKENTRY *)&tmpbk, sizeof(BOOKENTRY));
            if ((tmpbk.HashKey == bk.HashKey) && (tmpbk.HashLock == bk.HashLock)
                    (tmpbk.Move == bk.Move)) {
                tmpbk.Result += bk.Result; tmpbk.Count += 1; pMemFile->Position
= Offset1;
                pMemFile->Write((void *)(BOOKENTRY *)&tmpbk, sizeof(BOOKENTRY));
    pMemFile->Write((void *)(BOOKENTRY *)&bk, sizeof(BOOKENTRY));
    pMemFile->Position = 0; nCount++;
    pMemFile->Write((void *)(unsigned long *)&nCount, sizeof(unsigned long));



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