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Public Member Functions | List of all members
wxTempFileOutputStream Class Reference
Streams

`#include <wx/wfstream.h>`

Inheritance diagram for wxTempFileOutputStream:
[legend]

## Detailed Description

wxTempFileOutputStream is an output stream based on wxTempFile.

It provides a relatively safe way to replace the contents of the existing file.

##

Library: wxBase
Category: Streams

See Also
  wxTempFile

## Public Member Functions
| wxTempFileOutputStream (const wxString &fileName)
| Associates wxTempFileOutputStream with the file to be replaced and opens it.
virtual bool | Commit ()
| Validate changes: deletes the old file of the given name and renames the new file to the old name.
virtual void | Discard ()
| Discard changes: the old file contents are not changed, the temporary file is deleted.
Public Member Functions inherited from wxOutputStream
| wxOutputStream ()
| Creates a dummy wxOutputStream object.
virtual | ~wxOutputStream ()
| Destructor.
virtual bool | Close ()
| Closes the stream, returning false if an error occurs.
virtual size_t | LastWrite () const
| Returns the number of bytes written during the last Write().
void | PutC (char c)
| Puts the specified character in the output queue and increments the stream position.
virtual wxFileOffset | SeekO (wxFileOffset pos, wxSeekMode mode=wxFromStart)
| Changes the stream current position.
virtual wxFileOffset | TellO () const
| Returns the current stream position.
virtual wxOutputStream & | Write (const void *buffer, size_t size)
| Writes up to the specified amount of bytes using the data of buffer.
wxOutputStream & | Write (wxInputStream &stream_in)
| Reads data from the specified input stream and stores them in the current stream.
bool | WriteAll (const void *buffer, size_t size)
| Writes exactly the specified number of bytes from the buffer.
Public Member Functions inherited from wxStreamBase
| wxStreamBase ()
| Creates a dummy stream object.
virtual | ~wxStreamBase ()
| Destructor.
wxStreamError | GetLastError () const
| This function returns the last error.
virtual wxFileOffset | GetLength () const
| Returns the length of the stream in bytes.
virtual size_t | GetSize () const
| This function returns the size of the stream.
virtual bool | IsOk () const
| Returns true if no error occurred on the stream.
virtual bool | IsSeekable () const
| Returns true if the stream supports seeking to arbitrary offsets.
void | Reset (wxStreamError error=wxSTREAM_NO_ERROR)
| Resets the stream state.
bool | operator! () const
| Returns the opposite of IsOk().

## Additional Inherited Members
Protected Member Functions inherited from wxOutputStream
size_t | OnSysWrite (const void *buffer, size_t bufsize)
| Internal function.

## Constructor & Destructor Documentation

wxTempFileOutputStream::wxTempFileOutputStream | ( | const wxString & | fileName | ) |

Associates wxTempFileOutputStream with the file to be replaced and opens it.

Warning
  You should use wxStreamBase::IsOk() to verify if the constructor succeeded.

Call Commit() or wxOutputStream::Close() to replace the old file and close this one. Calling Discard() (or allowing the destructor to do it) will discard the changes.

## Member Function Documentation

virtual bool wxTempFileOutputStream::Commit | ( |  | ) |
| virtual

Validate changes: deletes the old file of the given name and renames the new file to the old name.

Returns true if both actions succeeded.

If false is returned it may unfortunately mean two quite different things: either that either the old file couldn't be deleted or that the new file couldn't be renamed to the old name.

virtual void wxTempFileOutputStream::Discard | ( |  | ) |
| virtual

Discard changes: the old file contents are not changed, the temporary file is deleted.