dbfile.h

mfc internals 源码 mfc internals 源码

// dbfile.h : defines the interface for the CDBaseFile class

// This is a part of the Objective Grid C++ Library.
// Copyright (C) 1995 ClassWorks, Stefan Hoenig.
// All rights reserved.
//
// This source code is only intended as a supplement to
// the Objective Grid Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding
// the Objective Grid product.
//

#ifndef _DBFILE_H_
#define _DBFILE_H_

class CField
{
public:
	enum FieldType {
		charField       = 'C',
		dateField       = 'D',
		numericField    = 'N',
		logicalField    = 'L',
		memoField       = 'M'
	};

	char  name[11];   // dbf field names are 10 chars long max.
	char  type;
	short len;
	short width;
	short decimals;
	int   offset;
};

	// long nCurrentWriteRecord;    // Current write record
	// char* writeBuf;              // buffer for writing records

class CDBaseFile
{
public:
	CDBaseFile();
	~CDBaseFile();

	BOOL Open(LPCTSTR szFileName, BOOL readOnly = FALSE);
	void Close();

	CString     sFileName;      // sFileName
	FILE*       fd;             // File handle
	long        nRecordCount;   // No. of records
	long        nCurrentRecord; // Current read record
	int         nFieldCount;    // No. of fields
	CPtrArray   fieldArray;     // Array with fields
	char*       recordBuf;      // buffer for reading records
	BOOL        bReadOnly;
	BOOL        bWriteFlag;

	BOOL Seek(long nRecord);
	void Flush();

	CField* GetField(int n) const;

	BOOL GetValue(int n, CString& result) const;
	BOOL IsDeleted() const;

	BOOL SetValue(int n, LPCTSTR s);

	int InitFields();

	short offset;
	short size;
};

#endif // _DBFILE_H_