diff options
Diffstat (limited to 'src/corelib/io/qfile.cpp')
| -rw-r--r-- | src/corelib/io/qfile.cpp | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/src/corelib/io/qfile.cpp b/src/corelib/io/qfile.cpp index 134c4b8b6d..c9b26032ea 100644 --- a/src/corelib/io/qfile.cpp +++ b/src/corelib/io/qfile.cpp @@ -1020,14 +1020,15 @@ bool QFile::open(OpenMode mode) \bold{Warning:} \list 1 - \o If \a fh is \c stdin, \c stdout, or \c stderr, you may not be able - to seek(). See QIODevice::isSequential() for more information. + \o If \a fh does not refer to a regular file, e.g., it is \c stdin, + \c stdout, or \c stderr, you may not be able to seek(). size() + returns \c 0 in those cases. See QIODevice::isSequential() for + more information. \o Since this function opens the file without specifying the file name, you cannot use this QFile with a QFileInfo. \endlist - \note For Windows CE you may not be able to call seek() and resize(). - Also, size() is set to \c 0. + \note For Windows CE you may not be able to call resize(). \sa close(), {qmake Variable Reference#CONFIG}{qmake Variable Reference} @@ -1064,7 +1065,7 @@ bool QFile::open(FILE *fh, OpenMode mode) if (mode & Append) { seek(size()); } else { - long pos = ftell(fh); + qint64 pos = (qint64)QT_FTELL(fh); if (pos != -1) seek(pos); } @@ -1081,7 +1082,7 @@ bool QFile::open(FILE *fh, OpenMode mode) /*! \overload - Opens the existing file descripter \a fd in the given \a mode. + Opens the existing file descriptor \a fd in the given \a mode. Returns true if successful; otherwise returns false. When a QFile is opened using this function, close() does not @@ -1092,12 +1093,13 @@ bool QFile::open(FILE *fh, OpenMode mode) are slow. If you run into performance issues, you should try to use one of the other open functions. - \warning If \a fd is 0 (\c stdin), 1 (\c stdout), or 2 (\c - stderr), you may not be able to seek(). size() is set to \c - LLONG_MAX (in \c <climits>). + \warning If \a fd is not a regular file, e.g, it is 0 (\c stdin), + 1 (\c stdout), or 2 (\c stderr), you may not be able to seek(). In + those cases, size() returns \c 0. See QIODevice::isSequential() + for more information. \warning For Windows CE you may not be able to call seek(), setSize(), - fileTime(). size() is set to \c 0. + fileTime(). size() returns \c 0. \warning Since this function opens the file without specifying the file name, you cannot use this QFile with a QFileInfo. @@ -1120,8 +1122,13 @@ bool QFile::open(int fd, OpenMode mode) } if(d->openExternalFile(mode, fd)) { QIODevice::open(mode); - if (mode & Append) + if (mode & Append) { seek(size()); + } else { + qint64 pos = (qint64)QT_LSEEK(fd, QT_OFF_T(0), SEEK_CUR); + if (pos != -1) + seek(pos); + } return true; } return false; |