1 files changed, 121 insertions, 0 deletions
diff --git a/doc/src/snippets/code/src_corelib_io_qdatastream.cpp b/doc/src/snippets/code/src_corelib_io_qdatastream.cpp
new file mode 100644
index 0000000000..cd9632c885
--- /dev/null
+++ b/doc/src/snippets/code/src_corelib_io_qdatastream.cpp
@@ -0,0 +1,121 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+void wrapInFunction()
+{
+
+//! [0]
+QFile file("file.dat");
+file.open(QIODevice::WriteOnly);
+QDataStream out(&file);   // we will serialize the data into the file
+out << QString("the answer is");   // serialize a string
+out << (qint32)42;        // serialize an integer
+//! [0]
+
+
+//! [1]
+QFile file("file.dat");
+file.open(QIODevice::ReadOnly);
+QDataStream in(&file);    // read the data serialized from the file
+QString str;
+qint32 a;
+in >> str >> a;           // extract "the answer is" and 42
+//! [1]
+
+
+//! [2]
+stream.setVersion(QDataStream::Qt_4_0);
+//! [2]
+
+
+//! [3]
+QFile file("file.xxx");
+file.open(QIODevice::WriteOnly);
+QDataStream out(&file);
+
+// Write a header with a "magic number" and a version
+out << (quint32)0xA0B0C0D0;
+out << (qint32)123;
+
+out.setVersion(QDataStream::Qt_4_0);
+
+// Write the data
+out << lots_of_interesting_data;
+//! [3]
+
+
+//! [4]
+QFile file("file.xxx");
+file.open(QIODevice::ReadOnly);
+QDataStream in(&file);
+
+// Read and check the header
+quint32 magic;
+in >> magic;
+if (magic != 0xA0B0C0D0)
+    return XXX_BAD_FILE_FORMAT;
+
+// Read the version
+qint32 version;
+in >> version;
+if (version < 100)
+    return XXX_BAD_FILE_TOO_OLD;
+if (version > 123)
+    return XXX_BAD_FILE_TOO_NEW;
+
+if (version <= 110)
+    in.setVersion(QDataStream::Qt_3_2);
+else
+    in.setVersion(QDataStream::Qt_4_0);
+
+// Read the data
+in >> lots_of_interesting_data;
+if (version >= 120)
+    in >> data_new_in_XXX_version_1_2;
+in >> other_interesting_data;
+//! [4]
+
+
+//! [5]
+QDataStream out(file);
+out.setVersion(QDataStream::Qt_4_0);
+//! [5]
+
+}