interface/wx/wfstream.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wfstream.h
   3 // Purpose:     interface of wxTempFileOutputStream
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     @class wxTempFileOutputStream
  11
  12     wxTempFileOutputStream is an output stream based on wxTempFile.
  13     It provides a relatively safe way to replace the contents of the
  14     existing file.
  15
  16     @library{wxbase}
  17     @category{streams}
  18
  19     @see wxTempFile
  20 */
  21 class wxTempFileOutputStream : public wxOutputStream
  22 {
  23 public:
  24     /**
  25         Associates wxTempFileOutputStream with the file to be replaced and opens it.
  26
  27         @warning
  28         You should use wxStreamBase::IsOk() to verify if the constructor succeeded.
  29
  30         Call Commit() or wxOutputStream::Close() to replace the old file and close
  31         this one. Calling Discard() (or allowing the destructor to do it) will
  32         discard the changes.
  33     */
  34     wxTempFileOutputStream(const wxString& fileName);
  35
  36     /**
  37         Validate changes: deletes the old file of the given name and renames the new
  38         file to the old name. Returns @true if both actions succeeded.
  39
  40         If @false is returned it may unfortunately mean two quite different things: either that
  41         either the old file couldn't be deleted or that the new file couldn't be renamed
  42         to the old name.
  43     */
  44     virtual bool Commit();
  45
  46     /**
  47         Discard changes: the old file contents are not changed, the temporary file is
  48         deleted.
  49     */
  50     virtual void Discard();
  51 };
  52
  53
  54
  55 /**
  56     @class wxFFileOutputStream
  57
  58     This class represents data written to a file.
  59     There are actually two such groups of classes: this one is based on wxFFile
  60     whereas wxFileOutputStream is based in the wxFile class.
  61
  62     Note that wxOutputStream::SeekO() can seek beyond the end of the stream
  63     (file) and will thus not return ::wxInvalidOffset for that.
  64
  65     @library{wxbase}
  66     @category{streams}
  67
  68     @see wxBufferedOutputStream, wxFFileInputStream, wxFileOutputStream, wxFileInputStream
  69 */
  70 class wxFFileOutputStream : public wxOutputStream
  71 {
  72 public:
  73     /**
  74         Open the given file @a filename with mode @a mode.
  75
  76         @warning
  77         You should use wxStreamBase::IsOk() to verify if the constructor succeeded.
  78     */
  79     wxFFileOutputStream(const wxString& filename,
  80                         const wxString& mode = "wb");
  81
  82     /**
  83         Initializes a file stream in write-only mode using the file I/O object file.
  84     */
  85     wxFFileOutputStream(wxFFile& file);
  86
  87     /**
  88         Initializes a file stream in write-only mode using the file descriptor fp.
  89     */
  90     wxFFileOutputStream(FILE* fp);
  91
  92     /**
  93         Destructor.
  94     */
  95     virtual ~wxFFileOutputStream();
  96
  97     /**
  98         Returns @true if the stream is initialized and ready.
  99     */
 100     bool IsOk() const;
 101 };
 102
 103
 104
 105 /**
 106     @class wxFileOutputStream
 107
 108     This class represents data written to a file.
 109     There are actually two such groups of classes: this one is based on wxFile
 110     whereas wxFFileOutputStream is based in the wxFFile class.
 111
 112     Note that wxOutputStream::SeekO() can seek beyond the end of the stream
 113     (file) and will thus not return ::wxInvalidOffset for that.
 114
 115     @library{wxbase}
 116     @category{streams}
 117
 118     @see wxBufferedOutputStream, wxFileInputStream, wxFFileOutputStream, wxFFileInputStream
 119 */
 120 class wxFileOutputStream : public wxOutputStream
 121 {
 122 public:
 123     /**
 124         Creates a new file with @a ofileName name and initializes the stream in write-only mode.
 125
 126         @warning
 127         You should use wxStreamBase::IsOk() to verify if the constructor succeeded.
 128     */
 129     wxFileOutputStream(const wxString& ofileName);
 130
 131     /**
 132         Initializes a file stream in write-only mode using the file I/O object file.
 133     */
 134     wxFileOutputStream(wxFile& file);
 135
 136     /**
 137         Initializes a file stream in write-only mode using the file descriptor @e fd.
 138     */
 139     wxFileOutputStream(int fd);
 140
 141     /**
 142         Destructor.
 143     */
 144     virtual ~wxFileOutputStream();
 145
 146     /**
 147         Returns @true if the stream is initialized and ready.
 148     */
 149     bool IsOk() const;
 150 };
 151
 152
 153
 154 /**
 155     @class wxFileInputStream
 156
 157     This class represents data read in from a file.
 158     There are actually two such groups of classes: this one is based on wxFile
 159     whereas wxFFileInputStream is based in the wxFFile class.
 160
 161     Note that wxInputStream::SeekI() can seek beyond the end of the stream (file)
 162     and will thus not return ::wxInvalidOffset for that.
 163
 164     @library{wxbase}
 165     @category{streams}
 166
 167     @see wxBufferedInputStream, wxFileOutputStream, wxFFileOutputStream
 168 */
 169 class wxFileInputStream : public wxInputStream
 170 {
 171 public:
 172     /**
 173         Opens the specified file using its @a ifileName name in read-only mode.
 174
 175         @warning
 176         You should use wxStreamBase::IsOk() to verify if the constructor succeeded.
 177     */
 178     wxFileInputStream(const wxString& ifileName);
 179
 180     /**
 181         Initializes a file stream in read-only mode using the file I/O object file.
 182     */
 183     wxFileInputStream(wxFile& file);
 184
 185     /**
 186         Initializes a file stream in read-only mode using the specified file descriptor.
 187     */
 188     wxFileInputStream(int fd);
 189
 190     /**
 191         Destructor.
 192     */
 193     virtual ~wxFileInputStream();
 194
 195     /**
 196         Returns @true if the stream is initialized and ready.
 197     */
 198     bool IsOk() const;
 199 };
 200
 201
 202
 203 /**
 204     @class wxFFileInputStream
 205
 206     This class represents data read in from a file.
 207     There are actually two such groups of classes: this one is based on wxFFile
 208     whereas wxFileInputStream is based in the wxFile class.
 209
 210     Note that wxInputStream::SeekI() can seek beyond the end of the stream (file)
 211     and will thus not return ::wxInvalidOffset for that.
 212
 213     @library{wxbase}
 214     @category{streams}
 215
 216     @see wxBufferedInputStream, wxFFileOutputStream, wxFileOutputStream
 217 */
 218 class wxFFileInputStream : public wxInputStream
 219 {
 220 public:
 221     /**
 222         Opens the specified file using its @a filename name using the specified @a mode.
 223
 224         @warning
 225         You should use wxStreamBase::IsOk() to verify if the constructor succeeded.
 226     */
 227     wxFFileInputStream(const wxString& filename,
 228                        const wxString& mode = "rb");
 229
 230     /**
 231         Initializes a file stream in read-only mode using the file I/O object file.
 232     */
 233     wxFFileInputStream(wxFFile& file);
 234
 235     /**
 236         Initializes a file stream in read-only mode using the specified file pointer @a fp.
 237     */
 238     wxFFileInputStream(FILE* fp);
 239
 240     /**
 241         Destructor.
 242     */
 243     virtual ~wxFFileInputStream();
 244
 245     /**
 246         Returns @true if the stream is initialized and ready.
 247     */
 248     bool IsOk() const;
 249 };
 250
 251
 252
 253 /**
 254     @class wxFFileStream
 255
 256     This stream allows to both read from and write to a file using buffered
 257     STDIO functions.
 258
 259     @library{wxbase}
 260     @category{streams}
 261
 262     @see wxFFileInputStream, wxFFileOutputStream, wxFileStream
 263 */
 264 class wxFFileStream : public wxFFileInputStream,
 265                       public wxFFileOutputStream
 266 {
 267 public:
 268     /**
 269         Initializes a new file stream in the given @a mode using the specified
 270         @a iofileName name.
 271
 272         @warning
 273         You should use wxStreamBase::IsOk() to verify if the constructor succeeded.
 274     */
 275     wxFFileStream(const wxString& iofileName, const wxString& mode = "w+b");
 276
 277     /**
 278         Returns @true if the stream is initialized and ready.
 279
 280         This method returns @true if the stream can be both read from and
 281         written to.
 282     */
 283     bool IsOk() const;
 284 };
 285
 286
 287
 288 /**
 289     @class wxFileStream
 290
 291     This class represents data that can be both read from and written to a file.
 292     There are actually two such groups of classes: this one is based on wxFile
 293     whereas wxFFileStream is based in the wxFFile class.
 294
 295     @library{wxbase}
 296     @category{streams}
 297
 298     @see wxFileInputStream, wxFileOutputStream, wxFFileStream
 299 */
 300 class wxFileStream : public wxFileOutputStream,
 301                      public wxFileInputStream
 302 {
 303 public:
 304     /**
 305         Initializes a new file stream in read-write mode using the specified
 306         @a iofileName name.
 307
 308         @warning
 309         You should use IsOk() to verify if the constructor succeeded.
 310     */
 311     wxFileStream(const wxString& iofileName);
 312
 313     /**
 314         Returns @true if the stream is initialized and ready.
 315
 316         This method returns @true if the stream can be both read from and
 317         written to.
 318     */
 319     bool IsOk() const;
 320 };
 321