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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  16     #pragma interface "ffile.h"
  17 #endif
  18
  19 #include "wx/defs.h"        // for wxUSE_FFILE
  20
  21 #if wxUSE_FFILE
  22
  23 #ifndef WX_PRECOMP
  24   #include  "wx/string.h"
  25   #include  "wx/filefn.h"
  26 #endif
  27
  28 #include <stdio.h>
  29
  30 // ----------------------------------------------------------------------------
  31 // class wxFFile: standard C stream library IO
  32 //
  33 // NB: for space efficiency this class has no virtual functions, including
  34 //     dtor which is _not_ virtual, so it shouldn't be used as a base class.
  35 // ----------------------------------------------------------------------------
  36
  37 class WXDLLIMPEXP_BASE wxFFile
  38 {
  39 public:
  40   // ctors
  41   // -----
  42     // def ctor
  43   wxFFile() { m_fp = NULL; }
  44     // open specified file (may fail, use IsOpened())
  45   wxFFile(const wxChar *filename, const wxChar *mode = _T("r"));
  46     // attach to (already opened) file
  47   wxFFile(FILE *fp) { m_fp = fp; }
  48
  49   // open/close
  50     // open a file (existing or not - the mode controls what happens)
  51   bool Open(const wxChar *filename, const wxChar *mode = _T("r"));
  52     // closes the opened file (this is a NOP if not opened)
  53   bool Close();
  54
  55   // assign an existing file descriptor and get it back from wxFFile object
  56   void Attach(FILE *fp, const wxString& name = wxEmptyString)
  57     { Close(); m_fp = fp; m_name = name; }
  58   void Detach() { m_fp = NULL; }
  59   FILE *fp() const { return m_fp; }
  60
  61   // read/write (unbuffered)
  62     // read all data from the file into a string (useful for text files)
  63   bool ReadAll(wxString *str);
  64     // returns number of bytes read - use Eof() and Error() to see if an error
  65     // occured or not
  66   size_t Read(void *pBuf, size_t nCount);
  67     // returns the number of bytes written
  68   size_t Write(const void *pBuf, size_t nCount);
  69     // returns true on success
  70   bool Write(const wxString& s, wxMBConv& conv = wxConvUTF8)
  71   {
  72       const wxWX2MBbuf buf = s.mb_str(conv);
  73       size_t size = strlen(buf);
  74       return Write((const char *)buf, size) == size;
  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(long ofs, wxSeekMode mode = wxFromStart);
  82     // move ptr to ofs bytes before the end
  83   bool SeekEnd(long ofs = 0) { return Seek(ofs, wxFromEnd); }
  84     // get current position in the file
  85   size_t Tell() const;
  86     // get current file length
  87   size_t 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     // is an error occured?
  96   bool Error() const { return ferror(m_fp) != 0; }
  97     // get the file name
  98   const wxString& GetName() const { return m_name; }
  99
 100   // dtor closes the file if opened
 101   ~wxFFile() { Close(); }
 102
 103 private:
 104   // copy ctor and assignment operator are private because it doesn't make
 105   // sense to copy files this way: attempt to do it will provoke a compile-time
 106   // error.
 107   wxFFile(const wxFFile&);
 108   wxFFile& operator=(const wxFFile&);
 109
 110   FILE *m_fp;       // IO stream or NULL if not opened
 111
 112   wxString m_name;  // the name of the file (for diagnostic messages)
 113 };
 114
 115 #endif // wxUSE_FFILE
 116
 117 #endif // _WX_FFILE_H_
 118