include/wx/ffile.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/ffile.h
   3 // Purpose:     wxFFile - encapsulates "FILE *" stream
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     14.07.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef   _WX_FFILE_H_
  13 #define   _WX_FFILE_H_
  14
  15 #include "wx/defs.h"        // for wxUSE_FFILE
  16
  17 #if wxUSE_FFILE
  18
  19 #include  "wx/string.h"
  20 #include  "wx/filefn.h"
  21 #include  "wx/convauto.h"
  22
  23 #include <stdio.h>
  24
  25 // ----------------------------------------------------------------------------
  26 // class wxFFile: standard C stream library IO
  27 //
  28 // NB: for space efficiency this class has no virtual functions, including
  29 //     dtor which is _not_ virtual, so it shouldn't be used as a base class.
  30 // ----------------------------------------------------------------------------
  31
  32 class WXDLLIMPEXP_BASE wxFFile
  33 {
  34 public:
  35   // ctors
  36   // -----
  37     // def ctor
  38   wxFFile() { m_fp = NULL; }
  39     // open specified file (may fail, use IsOpened())
  40   wxFFile(const wxChar *filename, const wxChar *mode = _T("r"));
  41     // attach to (already opened) file
  42   wxFFile(FILE *lfp) { m_fp = lfp; }
  43
  44   // open/close
  45     // open a file (existing or not - the mode controls what happens)
  46   bool Open(const wxChar *filename, const wxChar *mode = _T("r"));
  47     // closes the opened file (this is a NOP if not opened)
  48   bool Close();
  49
  50   // assign an existing file descriptor and get it back from wxFFile object
  51   void Attach(FILE *lfp, const wxString& name = wxEmptyString)
  52     { Close(); m_fp = lfp; m_name = name; }
  53   void Detach() { m_fp = NULL; }
  54   FILE *fp() const { return m_fp; }
  55
  56   // read/write (unbuffered)
  57     // read all data from the file into a string (useful for text files)
  58   bool ReadAll(wxString *str, const wxMBConv& conv = wxConvAuto());
  59     // returns number of bytes read - use Eof() and Error() to see if an error
  60     // occurred or not
  61   size_t Read(void *pBuf, size_t nCount);
  62     // returns the number of bytes written
  63   size_t Write(const void *pBuf, size_t nCount);
  64     // returns true on success
  65   bool Write(const wxString& s, const wxMBConv& conv = wxConvAuto())
  66   {
  67       const wxWX2MBbuf buf = s.mb_str(conv);
  68       if (buf)
  69       {
  70         size_t size = strlen(buf);
  71         return Write((const char *)buf, size) == size;
  72           }
  73           else
  74             return false;
  75   }
  76     // flush data not yet written
  77   bool Flush();
  78
  79   // file pointer operations (return ofsInvalid on failure)
  80     // move ptr ofs bytes related to start/current pos/end of file
  81   bool Seek(wxFileOffset ofs, wxSeekMode mode = wxFromStart);
  82     // move ptr to ofs bytes before the end
  83   bool SeekEnd(wxFileOffset ofs = 0) { return Seek(ofs, wxFromEnd); }
  84     // get current position in the file
  85   wxFileOffset Tell() const;
  86     // get current file length
  87   wxFileOffset Length() const;
  88
  89   // simple accessors: note that Eof() and Error() may only be called if
  90   // IsOpened()!
  91     // is file opened?
  92   bool IsOpened() const { return m_fp != NULL; }
  93     // is end of file reached?
  94   bool Eof() const { return feof(m_fp) != 0; }
  95     // has an error occurred?
  96   bool Error() const { return ferror(m_fp) != 0; }
  97     // get the file name
  98   const wxString& GetName() const { return m_name; }
  99     // type such as disk or pipe
 100   wxFileKind GetKind() const { return wxGetFileKind(m_fp); }
 101
 102   // dtor closes the file if opened
 103   ~wxFFile() { Close(); }
 104
 105 private:
 106   // copy ctor and assignment operator are private because it doesn't make
 107   // sense to copy files this way: attempt to do it will provoke a compile-time
 108   // error.
 109   wxFFile(const wxFFile&);
 110   wxFFile& operator=(const wxFFile&);
 111
 112   FILE *m_fp;       // IO stream or NULL if not opened
 113
 114   wxString m_name;  // the name of the file (for diagnostic messages)
 115 };
 116
 117 #endif // wxUSE_FFILE
 118
 119 #endif // _WX_FFILE_H_
 120