wxWidgets/include/wx/ffile.h
2001-06-26 20:59:19 +00:00

116 lines
3.6 KiB
C++

/////////////////////////////////////////////////////////////////////////////
// Name: ffile.h
// Purpose: wxFFile - encapsulates "FILE *" stream
// Author: Vadim Zeitlin
// Modified by:
// Created: 14.07.99
// RCS-ID: $Id$
// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_FFILE_H_
#define _WX_FFILE_H_
#ifdef __GNUG__
#pragma interface "ffile.h"
#endif
#if wxUSE_FFILE
#ifndef WX_PRECOMP
#include "wx/string.h"
#include "wx/filefn.h"
#endif
#include <stdio.h>
// ----------------------------------------------------------------------------
// class wxFFile: standard C stream library IO
//
// NB: for space efficiency this class has no virtual functions, including
// dtor which is _not_ virtual, so it shouldn't be used as a base class.
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxFFile
{
public:
// ctors
// -----
// def ctor
wxFFile() { m_fp = NULL; }
// open specified file (may fail, use IsOpened())
wxFFile(const wxChar *filename, const char *mode = "r");
// attach to (already opened) file
wxFFile(FILE *fp) { m_fp = fp; }
// open/close
// open a file (existing or not - the mode controls what happens)
bool Open(const wxChar *filename, const char *mode = "r");
// closes the opened file (this is a NOP if not opened)
bool Close();
// assign an existing file descriptor and get it back from wxFFile object
void Attach(FILE *fp, const wxString& name = wxT(""))
{ Close(); m_fp = fp; m_name = name; }
void Detach() { m_fp = NULL; }
FILE *fp() const { return m_fp; }
// read/write (unbuffered)
// read all data from the file into a string (useful for text files)
bool ReadAll(wxString *str);
// returns number of bytes read - use Eof() and Error() to see if an error
// occured or not
size_t Read(void *pBuf, size_t nCount);
// returns the number of bytes written
size_t Write(const void *pBuf, size_t nCount);
// returns true on success
bool Write(const wxString& s, wxMBConv& conv = wxConvLibc)
{
const wxWX2MBbuf buf = s.mb_str(conv);
size_t size = strlen(buf);
return Write((const char *)buf, size) == size;
}
// flush data not yet written
bool Flush();
// file pointer operations (return ofsInvalid on failure)
// move ptr ofs bytes related to start/current pos/end of file
bool Seek(long ofs, wxSeekMode mode = wxFromStart);
// move ptr to ofs bytes before the end
bool SeekEnd(long ofs = 0) { return Seek(ofs, wxFromEnd); }
// get current position in the file
size_t Tell() const;
// get current file length
size_t Length() const;
// simple accessors
// is file opened?
bool IsOpened() const { return m_fp != NULL; }
// is end of file reached?
bool Eof() const { return feof(m_fp) != 0; }
// is an error occured?
bool Error() const { return ferror(m_fp) != 0; }
// get the file name
const wxString& GetName() const { return m_name; }
// dtor closes the file if opened
~wxFFile() { Close(); }
private:
// copy ctor and assignment operator are private because it doesn't make
// sense to copy files this way: attempt to do it will provoke a compile-time
// error.
wxFFile(const wxFFile&);
wxFFile& operator=(const wxFFile&);
FILE *m_fp; // IO stream or NULL if not opened
wxString m_name; // the name of the file (for diagnostic messages)
};
#endif // wxUSE_FFILE
#endif // _WX_FFILE_H_