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| author | Alex Trotsenko <alex1973tr@gmail.com> | 2015-03-05 10:52:17 +0200 |
|---|---|---|
| committer | Alex Trotsenko <alex1973tr@gmail.com> | 2016-01-13 16:31:33 +0000 |
| commit | 184d66caa5f7f93b7383319c5c8985524e0dc824 (patch) | |
| tree | 272ce3f066d3c80f77dfca50fd0914b341c2f9da /src/corelib/doc | |
| parent | ca6f11dcf207aa51ce32c9813ad1ab3790bb31ee (diff) | |
QDataStream: handle incomplete reads from QIODevice
This adds a way to resume reading from a stream after a ReadPastEnd error.
This is done by introducing a stream read transaction mechanism that keeps
read data in an internal buffer and rolls it back on failure.
[ChangeLog][QtCore] Added QDataStream startTransaction(),
commitTransaction(), rollbackTransaction(), abortTransaction()
functions to support read transactions.
Task-number: QTBUG-44418
Change-Id: Ibf946e1939a5573c4182fea7e26608947218c2d9
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Diffstat (limited to 'src/corelib/doc')
| -rw-r--r-- | src/corelib/doc/snippets/code/src_corelib_io_qdatastream.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_io_qdatastream.cpp b/src/corelib/doc/snippets/code/src_corelib_io_qdatastream.cpp index cc874a1733..b1f4bb6df1 100644 --- a/src/corelib/doc/snippets/code/src_corelib_io_qdatastream.cpp +++ b/src/corelib/doc/snippets/code/src_corelib_io_qdatastream.cpp @@ -118,4 +118,14 @@ QDataStream out(file); out.setVersion(QDataStream::Qt_4_0); //! [5] +//! [6] +in.startTransaction(); +QString str; +qint32 a; +in >> str >> a; // try to read packet atomically + +if (!in.commitTransaction()) + return; // wait for more data +//! [6] + } |