// Purpose: interface of wxTempFile, wxFile
// Author: wxWidgets team
// RCS-ID: $Id$
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-/**
- We redefine these constants here because S_IREAD &c are _not_ standard.
- However, we do assume that the values correspond to the Unix umask bits.
-*/
-enum wxPosixPermissions
-{
- /// standard Posix names for these permission flags
- //@{
- wxS_IRUSR = 00400,
- wxS_IWUSR = 00200,
- wxS_IXUSR = 00100,
-
- wxS_IRGRP = 00040,
- wxS_IWGRP = 00020,
- wxS_IXGRP = 00010,
-
- wxS_IROTH = 00004,
- wxS_IWOTH = 00002,
- wxS_IXOTH = 00001,
- //@}
-
- /// longer but more readable synonims for the constants above
- //@{
- wxPOSIX_USER_READ = wxS_IRUSR,
- wxPOSIX_USER_WRITE = wxS_IWUSR,
- wxPOSIX_USER_EXECUTE = wxS_IXUSR,
-
- wxPOSIX_GROUP_READ = wxS_IRGRP,
- wxPOSIX_GROUP_WRITE = wxS_IWGRP,
- wxPOSIX_GROUP_EXECUTE = wxS_IXGRP,
-
- wxPOSIX_OTHERS_READ = wxS_IROTH,
- wxPOSIX_OTHERS_WRITE = wxS_IWOTH,
- wxPOSIX_OTHERS_EXECUTE = wxS_IXOTH,
- //@}
-
- /// Default mode for the new files: allow reading/writing them to everybody but
- /// the effective file mode will be set after ANDing this value with umask and
- /// so won't include wxS_IW{GRP,OTH} for the default 022 umask value
- wxS_DEFAULT = (wxPOSIX_USER_READ | wxPOSIX_USER_WRITE | \
- wxPOSIX_GROUP_READ | wxPOSIX_GROUP_WRITE | \
- wxPOSIX_OTHERS_READ | wxPOSIX_OTHERS_WRITE),
-
- /// Default mode for the new directories (see wxFileName::Mkdir): allow
- /// reading/writing/executing them to everybody, but just like wxS_DEFAULT
- /// the effective directory mode will be set after ANDing this value with umask
- wxS_DIR_DEFAULT = (wxPOSIX_USER_READ | wxPOSIX_USER_WRITE | wxPOSIX_USER_EXECUTE | \
- wxPOSIX_GROUP_READ | wxPOSIX_GROUP_WRITE | wxPOSIX_GROUP_EXECUTE | \
- wxPOSIX_OTHERS_READ | wxPOSIX_OTHERS_WRITE | wxPOSIX_OTHERS_EXECUTE)
-};
-
-
-
/**
@class wxTempFile
public:
/**
Associates wxTempFile with the file to be replaced and opens it.
+
+ @warning
You should use IsOpened() to verify that the constructor succeeded.
*/
wxTempFile(const wxString& strName);
*/
void Discard();
+ /**
+ Flush the data written to the file to disk.
+
+ This simply calls wxFile::Flush() for the underlying file and may be
+ necessary with file systems such as XFS and Ext4 under Linux. Calling
+ this function may however have serious performance implications and
+ also is not necessary with many other file systems so it is not done by
+ default -- but you can call it before calling Commit() to absolutely
+ ensure that the data was indeed written to the disk correctly.
+ */
+ bool Flush();
+
/**
Returns @true if the file was successfully opened.
*/
/**
Returns the length of the file.
- This method may return wxInvalidOffset if the length couldn't be
+ This method may return ::wxInvalidOffset if the length couldn't be
determined or 0 even for non-empty files if the file is not seekable.
In general, the only way to determine if the file for which this function
wxSeekMode mode = wxFromStart);
/**
- Returns the current position or wxInvalidOffset if file is not opened or
+ Returns the current position or ::wxInvalidOffset if file is not opened or
if another error occurred.
*/
wxFileOffset Tell() const;
or test if it can be opened for writing with Access(). */
write,
- /** Open file for reading and writing; can not be used with Access() */
+ /** Open file for reading and writing; cannot be used with Access() */
read_write,
/** Open file for appending: the file is opened for writing, but the old contents
of the file are not erased and the file pointer is initially placed at the end
- of the file; can not be used with Access().
+ of the file; cannot be used with Access().
This is the same as OpenMode::write if the file doesn't exist.
*/
The filename.
@param mode
The mode in which to open the file.
+
+ @warning
+ You should use IsOpened() to verify that the constructor succeeded.
*/
wxFile(const wxString& filename,
wxFile::OpenMode mode = wxFile::read);
*/
~wxFile();
+ /**
+ Returns the error code for the last unsuccessful operation.
+
+ The error code is system-dependent and corresponds to the value of the
+ standard @c errno variable when the last error occurred.
+
+ Notice that only simple accessors such as IsOpened() and Eof() (and
+ this method itself) don't modify the last error value, all other
+ methods can potentially change it if an error occurs, including the
+ const ones such as Tell() or Length().
+
+ @since 2.9.2
+
+ @see ClearLastError()
+ */
+ int GetLastError() const;
+
+ /**
+ Resets the error code.
+
+ GetLastError() will return 0 until the next error occurs.
+
+ @since 2.9.2
+ */
+ void ClearLastError();
+
/**
This function verifies if we may access the given file in specified mode.
Only values of @c wxFile::read or @c wxFile::write really make sense here.
@param mode
The mode in which to open the file.
@param access
- An OR-combination of wxPosixPermissions enumeration values.
+ An OR-combination of ::wxPosixPermissions enumeration values.
*/
bool Open(const wxString& filename, wxFile::OpenMode mode = wxFile::read,
int access = wxS_DEFAULT);
@param count
Bytes to read
- @return The number of bytes read, or the symbol wxInvalidOffset.
+ @return The number of bytes read, or the symbol ::wxInvalidOffset.
*/
ssize_t Read(void* buffer, size_t count);
@param mode
One of wxFromStart, wxFromEnd, wxFromCurrent.
- @return The actual offset position achieved, or wxInvalidOffset on
+ @return The actual offset position achieved, or ::wxInvalidOffset on
failure.
*/
wxFileOffset Seek(wxFileOffset ofs,
@param ofs
Number of bytes before the end of the file.
- @return The actual offset position achieved, or wxInvalidOffset on
+ @return The actual offset position achieved, or ::wxInvalidOffset on
failure.
*/
wxFileOffset SeekEnd(wxFileOffset ofs = 0);
/**
- Returns the current position or wxInvalidOffset if file is not opened or
+ Returns the current position or ::wxInvalidOffset if file is not opened or
if another error occurred.
*/
wxFileOffset Tell() const;
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