tabdatfile.h

linux下一款GIS程序源码

// tabdatfile.h: interface for the TABDATFile class.
//
/*---------------------------------------------------------------------
 *                      class TABDATFile
 *
 * Class to handle Read/Write operation on .DAT files... the .DAT file
 * contains the table of attribute field values.
 *--------------------------------------------------------------------*/

#ifndef  TABDATFile_H
#define  TABDATFile_H

#include "tabindfile.h"
#include "tabrawbinblock.h"

class TABDATFile  
{
private:
    char        *m_pszFname;
    FILE        *m_fp;
    TABAccess   m_eAccessMode;
    TABTableType m_eTableType;

    TABRawBinBlock *m_poHeaderBlock;
    int         m_numFields;
    TABDATFieldDef *m_pasFieldDef;

    TABRawBinBlock *m_poRecordBlock;
    int         m_nBlockSize;
    int         m_nRecordSize;
    int         m_nCurRecordId;
    UGKBool       m_bCurRecordDeletedFlag;

    UGKInt32      m_numRecords;
    UGKInt32      m_nFirstRecordPtr;
    UGKBool       m_bWriteHeaderInitialized;

    int         InitWriteHeader();
    int         WriteHeader();

public:
	TABDATFile();
	virtual ~TABDATFile();

    int         Open(const char *pszFname, const char *pszAccess,
                     TABTableType eTableType =TABTableNative);
    int         Close();


    int         GetNumFields();
    TABFieldType GetFieldType(int nFieldId);
    int         GetFieldWidth(int nFieldId);
    int         GetFieldPrecision(int nFieldId);
    int         ValidateFieldInfoFromTAB(int iField, const char *pszName,
                                         TABFieldType eType,
                                         int nWidth, int nPrecision);

    int         AddField(const char *pszName, TABFieldType eType,
                         int nWidth, int nPrecision=0);

    UGKInt32      GetNumRecords();
    TABRawBinBlock *GetRecordBlock(int nRecordId);
    UGKBool       IsCurrentRecordDeleted() { return m_bCurRecordDeletedFlag;};
    int         CommitRecordToFile();

    const char  *ReadCharField(int nWidth);
    UGKInt32      ReadIntegerField(int nWidth);
    UGKInt16      ReadSmallIntField(int nWidth);
    double      ReadFloatField(int nWidth);
    double      ReadDecimalField(int nWidth);
    const char  *ReadLogicalField(int nWidth);
    const char  *ReadDateField(int nWidth);

    int         WriteCharField(const char *pszValue, int nWidth,
                               TABINDFile *poINDFile, int nIndexNo);
    int         WriteIntegerField(UGKInt32 nValue,
                                  TABINDFile *poINDFile, int nIndexNo);
    int         WriteSmallIntField(UGKInt16 nValue,
                                   TABINDFile *poINDFile, int nIndexNo);
    int         WriteFloatField(double dValue,
                                TABINDFile *poINDFile, int nIndexNo);
    int         WriteDecimalField(double dValue, int nWidth, int nPrecision,
                                  TABINDFile *poINDFile, int nIndexNo);
    int         WriteLogicalField(const char *pszValue,
                                  TABINDFile *poINDFile, int nIndexNo);
    int         WriteDateField(const char *pszValue,
                               TABINDFile *poINDFile, int nIndexNo);

	void Dump(FILE *fpOut = NULL);
};

#endif