Qt翻译相关类之QDataStream

超、凢脫俗 2023-07-03 06:21 22阅读 0赞

# QDataStream Class #

[QDataStream][] 类提供的二进制数据的序列化到 [QIODevice中][QIODevice]。 [更多...][...]

<table> 
 <tbody> 
 <tr> 
 <td>Header:</td> 
 <td>#include &lt;QDataStream&gt;</td> 
 </tr> 
 <tr> 
 <td>qmake:</td> 
 <td>QT += core</td> 
 </tr> 
 </tbody> 
</table>

*  [所有成员的列表，包括继承的成员][Link 1]
 *  [过时的成员][Link 2]

**注意：** 此类中的所有函数都是 [可重入的][Link 3]。

## Public Types ##

<table> 
 <tbody> 
 <tr> 
 <td>enum</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#ByteOrder-enum" rel="nofollow">ByteOrder</a>&nbsp;{ BigEndian, LittleEndian }</td> 
 </tr> 
 <tr> 
 <td>enum</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#FloatingPointPrecision-enum" rel="nofollow">FloatingPointPrecision</a>&nbsp;{ SinglePrecision, DoublePrecision }</td> 
 </tr> 
 <tr> 
 <td>enum</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#Status-enum" rel="nofollow">Status</a>&nbsp;{ Ok, ReadPastEnd, ReadCorruptData, WriteFailed }</td> 
 </tr> 
 <tr> 
 <td>enum</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#Version-enum" rel="nofollow">Version</a>&nbsp;{ Qt_1_0, Qt_2_0, Qt_2_1, Qt_3_0, ..., Qt_5_13 }</td> 
 </tr> 
 </tbody> 
</table>

## Public Functions ##

<table> 
 <tbody> 
 <tr> 
 <td>&nbsp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#QDataStream-3" rel="nofollow">QDataStream</a>(const QByteArray &amp;a)</td> 
 </tr> 
 <tr> 
 <td>&nbsp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#QDataStream-2" rel="nofollow">QDataStream</a>(QByteArray *a, QIODevice::OpenMode&nbsp;mode)</td> 
 </tr> 
 <tr> 
 <td>&nbsp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#QDataStream-1" rel="nofollow">QDataStream</a>(QIODevice *d)</td> 
 </tr> 
 <tr> 
 <td>&nbsp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#QDataStream" rel="nofollow">QDataStream</a>()</td> 
 </tr> 
 <tr> 
 <td>&nbsp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#dtor.QDataStream" rel="nofollow">~QDataStream</a>()</td> 
 </tr> 
 <tr> 
 <td>void</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#abortTransaction" rel="nofollow">abortTransaction</a>()</td> 
 </tr> 
 <tr> 
 <td>bool</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#atEnd" rel="nofollow">atEnd</a>() const</td> 
 </tr> 
 <tr> 
 <td>QDataStream::ByteOrder</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#byteOrder" rel="nofollow">byteOrder</a>() const</td> 
 </tr> 
 <tr> 
 <td>bool</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#commitTransaction" rel="nofollow">commitTransaction</a>()</td> 
 </tr> 
 <tr> 
 <td>QIODevice *</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#device" rel="nofollow">device</a>() const</td> 
 </tr> 
 <tr> 
 <td>QDataStream::FloatingPointPrecision</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#floatingPointPrecision" rel="nofollow">floatingPointPrecision</a>() const</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#readBytes" rel="nofollow">readBytes</a>(char *&amp;s, uint &amp;l)</td> 
 </tr> 
 <tr> 
 <td>int</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#readRawData" rel="nofollow">readRawData</a>(char *s, int&nbsp;len)</td> 
 </tr> 
 <tr> 
 <td>void</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#resetStatus" rel="nofollow">resetStatus</a>()</td> 
 </tr> 
 <tr> 
 <td>void</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#rollbackTransaction" rel="nofollow">rollbackTransaction</a>()</td> 
 </tr> 
 <tr> 
 <td>void</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#setByteOrder" rel="nofollow">setByteOrder</a>(QDataStream::ByteOrder&nbsp;bo)</td> 
 </tr> 
 <tr> 
 <td>void</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#setDevice" rel="nofollow">setDevice</a>(QIODevice *d)</td> 
 </tr> 
 <tr> 
 <td>void</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#setFloatingPointPrecision" rel="nofollow">setFloatingPointPrecision</a>(QDataStream::FloatingPointPrecision&nbsp;precision)</td> 
 </tr> 
 <tr> 
 <td>void</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#setStatus" rel="nofollow">setStatus</a>(QDataStream::Status&nbsp;status)</td> 
 </tr> 
 <tr> 
 <td>void</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#setVersion" rel="nofollow">setVersion</a>(int&nbsp;v)</td> 
 </tr> 
 <tr> 
 <td>int</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#skipRawData" rel="nofollow">skipRawData</a>(int&nbsp;len)</td> 
 </tr> 
 <tr> 
 <td>void</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#startTransaction" rel="nofollow">startTransaction</a>()</td> 
 </tr> 
 <tr> 
 <td>QDataStream::Status</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#status" rel="nofollow">status</a>() const</td> 
 </tr> 
 <tr> 
 <td>int</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#version" rel="nofollow">version</a>() const</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#writeBytes" rel="nofollow">writeBytes</a>(const char *s, uint&nbsp;len)</td> 
 </tr> 
 <tr> 
 <td>int</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#writeRawData" rel="nofollow">writeRawData</a>(const char *s, int&nbsp;len)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt" rel="nofollow">operator&lt;&lt;</a>(qint8&nbsp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-1" rel="nofollow">operator&lt;&lt;</a>(quint8&nbsp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-2" rel="nofollow">operator&lt;&lt;</a>(qint16&nbsp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-3" rel="nofollow">operator&lt;&lt;</a>(quint16&nbsp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-4" rel="nofollow">operator&lt;&lt;</a>(qint32&nbsp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-5" rel="nofollow">operator&lt;&lt;</a>(quint32&nbsp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-6" rel="nofollow">operator&lt;&lt;</a>(qint64&nbsp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-7" rel="nofollow">operator&lt;&lt;</a>(quint64&nbsp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-8" rel="nofollow">operator&lt;&lt;</a>(std::nullptr_t&nbsp;ptr)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-9" rel="nofollow">operator&lt;&lt;</a>(bool&nbsp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-10" rel="nofollow">operator&lt;&lt;</a>(qfloat16&nbsp;f)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-11" rel="nofollow">operator&lt;&lt;</a>(float&nbsp;f)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-12" rel="nofollow">operator&lt;&lt;</a>(double&nbsp;f)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-lt-lt-13" rel="nofollow">operator&lt;&lt;</a>(const char *s)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt" rel="nofollow">operator&gt;&gt;</a>(qint8 &amp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-1" rel="nofollow">operator&gt;&gt;</a>(quint8 &amp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-2" rel="nofollow">operator&gt;&gt;</a>(qint16 &amp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-3" rel="nofollow">operator&gt;&gt;</a>(quint16 &amp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-4" rel="nofollow">operator&gt;&gt;</a>(qint32 &amp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-5" rel="nofollow">operator&gt;&gt;</a>(quint32 &amp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-6" rel="nofollow">operator&gt;&gt;</a>(qint64 &amp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-7" rel="nofollow">operator&gt;&gt;</a>(quint64 &amp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-8" rel="nofollow">operator&gt;&gt;</a>(std::nullptr_t &amp;ptr)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-9" rel="nofollow">operator&gt;&gt;</a>(bool &amp;i)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-10" rel="nofollow">operator&gt;&gt;</a>(qfloat16 &amp;f)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-11" rel="nofollow">operator&gt;&gt;</a>(float &amp;f)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-12" rel="nofollow">operator&gt;&gt;</a>(double &amp;f)</td> 
 </tr> 
 <tr> 
 <td>QDataStream &amp;</td> 
 <td><a href="https://doc.qt.io/archives/qt-5.13/qdatastream.html#operator-gt-gt-13" rel="nofollow">operator&gt;&gt;</a>(char *&amp;s)</td> 
 </tr> 
 </tbody> 
</table>

## 详细说明 ##

数据流是编码信息的二进制流，它与主机计算机的操作系统，CPU或字节顺序无关，都是100％的。例如，运行Windows的Sun SPARC可以读取Windows下PC写入的数据流。

您还可以使用数据流来读取/写入[未编码的原始二进制数据][Link 4]。如果要“解析”输入流，请参见[QTextStream][]。

的[QDataStream][]类实现C ++的基本数据类型，等的串行化`char`，`short`，`int`，`char *`，更复杂的数据的序列化等由数据分解成原始单元来完成的。

数据流与[QIODevice][]紧密[协作][QIODevice]。甲[QIODevice中][QIODevice]表示的输入/输出介质中的一种可以读取数据和写入数据到。的[一个QFile][QFile]类是一个I / O设备的一个例子。

示例（将二进制数据写入流）：

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

示例（从流中读取二进制数据）：

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

写入流的每个项目均以预定义的二进制格式写入，该格式根据项目的类型而有所不同。支持Qt的类型包括[QBrush][]，[而QColor][QColor]，[QDateTime][]，[QFont][]，[QPixmap的][QPixmap]，[QString的][QString]，[的QVariant][QVariant]和其他许多人。有关支持数据流的所有Qt类型的完整列表，请参见[序列化Qt数据类型][Qt]。

对于整数，最好始终将其转换为Qt整数类型进行写入，然后再读回相同的Qt整数类型。这样可以确保获得所需大小的整数，并使您与编译器和平台的差异隔离。

举一个例子，一个`char *`字符串被写为一个32位整数，该整数等于包括'\\ 0'字节的字符串的长度，其后是包括'\\ 0'字节的字符串的所有字符。读取`char *`字符串时，将读取4个字节以创建32位长度值，然后读取该字符串的许多字符，`char *`包括'\\ 0'终止符。

初始I / O设备通常在构造函数中设置，但可以使用[setDevice][]（）进行更改。如果到达数据末尾（或没有设置I / O设备），则[atEnd][]（）将返回true。

## Member Type Documentation ##

### enum QDataStream::ByteOrder ###

The byte order used for reading/writing the data.

<table> 
 <tbody> 
 <tr> 
 <th>Constant</th> 
 <th>Value</th> 
 <th>Description</th> 
 </tr> 
 <tr> 
 <td><code>QDataStream::BigEndian</code></td> 
 <td><code>QSysInfo::BigEndian</code></td> 
 <td>Most significant byte first (the default)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::LittleEndian</code></td> 
 <td><code>QSysInfo::LittleEndian</code></td> 
 <td>Least significant byte first</td> 
 </tr> 
 </tbody> 
</table>

### enum QDataStream::FloatingPointPrecision ###

The precision of floating point numbers used for reading/writing the data. This will only have an effect if the version of the data stream is [Qt\_4\_6][Qt_4_6] or higher.

**Warning:** The floating point precision must be set to the same value on the object that writes and the object that reads the data stream.

<table> 
 <tbody> 
 <tr> 
 <th>Constant</th> 
 <th>Value</th> 
 <th>Description</th> 
 </tr> 
 <tr> 
 <td><code>QDataStream::SinglePrecision</code></td> 
 <td><code>0</code></td> 
 <td>All floating point numbers in the data stream have 32-bit precision.</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::DoublePrecision</code></td> 
 <td><code>1</code></td> 
 <td>All floating point numbers in the data stream have 64-bit precision.</td> 
 </tr> 
 </tbody> 
</table>

**See also** [setFloatingPointPrecision][]() and [floatingPointPrecision][]().

### enum QDataStream::Status ###

This enum describes the current status of the data stream.

<table> 
 <tbody> 
 <tr> 
 <th>Constant</th> 
 <th>Value</th> 
 <th>Description</th> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Ok</code></td> 
 <td><code>0</code></td> 
 <td>The data stream is operating normally.</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::ReadPastEnd</code></td> 
 <td><code>1</code></td> 
 <td>The data stream has read past the end of the data in the underlying device.</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::ReadCorruptData</code></td> 
 <td><code>2</code></td> 
 <td>The data stream has read corrupt data.</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::WriteFailed</code></td> 
 <td><code>3</code></td> 
 <td>The data stream cannot write to the underlying device.</td> 
 </tr> 
 </tbody> 
</table>

### enum QDataStream::Version ###

This enum provides symbolic synonyms for the data serialization format version numbers.

<table> 
 <tbody> 
 <tr> 
 <th>Constant</th> 
 <th>Value</th> 
 <th>Description</th> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_1_0</code></td> 
 <td><code>1</code></td> 
 <td>Version 1 (Qt 1.x)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_2_0</code></td> 
 <td><code>2</code></td> 
 <td>Version 2 (Qt 2.0)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_2_1</code></td> 
 <td><code>3</code></td> 
 <td>Version 3 (Qt 2.1, 2.2, 2.3)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_3_0</code></td> 
 <td><code>4</code></td> 
 <td>Version 4 (Qt 3.0)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_3_1</code></td> 
 <td><code>5</code></td> 
 <td>Version 5 (Qt 3.1, 3.2)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_3_3</code></td> 
 <td><code>6</code></td> 
 <td>Version 6 (Qt 3.3)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_4_0</code></td> 
 <td><code>7</code></td> 
 <td>Version 7 (Qt 4.0, Qt 4.1)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_4_1</code></td> 
 <td><code>Qt_4_0</code></td> 
 <td>Version 7 (Qt 4.0, Qt 4.1)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_4_2</code></td> 
 <td><code>8</code></td> 
 <td>Version 8 (Qt 4.2)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_4_3</code></td> 
 <td><code>9</code></td> 
 <td>Version 9 (Qt 4.3)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_4_4</code></td> 
 <td><code>10</code></td> 
 <td>Version 10 (Qt 4.4)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_4_5</code></td> 
 <td><code>11</code></td> 
 <td>Version 11 (Qt 4.5)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_4_6</code></td> 
 <td><code>12</code></td> 
 <td>Version 12 (Qt 4.6, Qt 4.7, Qt 4.8)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_4_7</code></td> 
 <td><code>Qt_4_6</code></td> 
 <td>Same as Qt_4_6.</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_4_8</code></td> 
 <td><code>Qt_4_7</code></td> 
 <td>Same as Qt_4_6.</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_4_9</code></td> 
 <td><code>Qt_4_8</code></td> 
 <td>Same as Qt_4_6.</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_0</code></td> 
 <td><code>13</code></td> 
 <td>Version 13 (Qt 5.0)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_1</code></td> 
 <td><code>14</code></td> 
 <td>Version 14 (Qt 5.1)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_2</code></td> 
 <td><code>15</code></td> 
 <td>Version 15 (Qt 5.2)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_3</code></td> 
 <td><code>Qt_5_2</code></td> 
 <td>Same as Qt_5_2</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_4</code></td> 
 <td><code>16</code></td> 
 <td>Version 16 (Qt 5.4)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_5</code></td> 
 <td><code>Qt_5_4</code></td> 
 <td>Same as Qt_5_4</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_6</code></td> 
 <td><code>17</code></td> 
 <td>Version 17 (Qt 5.6)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_7</code></td> 
 <td><code>Qt_5_6</code></td> 
 <td>Same as Qt_5_6</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_8</code></td> 
 <td><code>Qt_5_7</code></td> 
 <td>Same as Qt_5_6</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_9</code></td> 
 <td><code>Qt_5_8</code></td> 
 <td>Same as Qt_5_6</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_10</code></td> 
 <td><code>Qt_5_9</code></td> 
 <td>Same as Qt_5_6</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_11</code></td> 
 <td><code>Qt_5_10</code></td> 
 <td>Same as Qt_5_6</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_12</code></td> 
 <td><code>18</code></td> 
 <td>Version 18 (Qt 5.12)</td> 
 </tr> 
 <tr> 
 <td><code>QDataStream::Qt_5_13</code></td> 
 <td><code>19</code></td> 
 <td>Version 19 (Qt 5.13)</td> 
 </tr> 
 </tbody> 
</table>

**See also** [setVersion][]() and [version][]().

## Member Function Documentation ##

### QDataStream::QDataStream(const [QByteArray][] &*a*) ###

Constructs a read-only data stream that operates on byte array *a*. Use [QDataStream][]([QByteArray][]\*, int) if you want to write to a byte array.

Since [QByteArray][] is not a [QIODevice][] subclass, internally a [QBuffer][] is created to wrap the byte array.

### QDataStream::QDataStream([QByteArray][] \**a*, [QIODevice::OpenMode][QIODevice_OpenMode] *mode*) ###

Constructs a data stream that operates on a byte array, *a*. The *mode* describes how the device is to be used.

Alternatively, you can use [QDataStream][](const [QByteArray][] &) if you just want to read from a byte array.

Since [QByteArray][] is not a [QIODevice][] subclass, internally a [QBuffer][] is created to wrap the byte array.

### QDataStream::QDataStream([QIODevice][] \**d*) ###

Constructs a data stream that uses the I/O device *d*.

**See also** [setDevice][]() and [device][]().

### QDataStream::QDataStream() ###

Constructs a data stream that has no I/O device.

**See also** [setDevice][]().

### QDataStream::~QDataStream() ###

Destroys the data stream.

The destructor will not affect the current I/O device, unless it is an internal I/O device (e.g. a [QBuffer][]) processing a [QByteArray][] passed in the *constructor*, in which case the internal I/O device is destroyed.

### void QDataStream::abortTransaction() ###

Aborts a read transaction.

This function is commonly used to discard the transaction after higher-level protocol errors or loss of stream synchronization.

If called on an inner transaction, aborting is delegated to the outermost transaction, and subsequently started inner transactions are forced to fail.

For the outermost transaction, discards the restoration point and any internally duplicated data of the stream. Will not affect the current read position of the stream.

Sets the status of the data stream to

<table> 
 <tbody> 
 <tr> 
 <th>Constant</th> 
 <th>Description</th> 
 </tr> 
 <tr> 
 <td><code>ReadCorruptData</code></td> 
 <td>.</td> 
 </tr> 
 </tbody> 
</table>

This function was introduced in Qt 5.7.

**See also** [startTransaction][](), [commitTransaction][](), and [rollbackTransaction][]().

### bool QDataStream::atEnd() const ###

Returns `true` if the I/O device has reached the end position (end of the stream or file) or if there is no I/O device set; otherwise returns `false`.

**See also** [QIODevice::atEnd][QIODevice_atEnd]().

### [QDataStream::ByteOrder][QDataStream_ByteOrder] QDataStream::byteOrder() const ###

Returns the current byte order setting -- either [BigEndian][QDataStream_ByteOrder] or [LittleEndian][QDataStream_ByteOrder].

**See also** [setByteOrder][]().

### bool QDataStream::commitTransaction() ###

Completes a read transaction. Returns `true` if no read errors have occurred during the transaction; otherwise returns `false`.

If called on an inner transaction, committing will be postponed until the outermost commitTransaction(), [rollbackTransaction][](), or [abortTransaction][]() call occurs.

Otherwise, if the stream status indicates reading past the end of the data, this function restores the stream data to the point of the [startTransaction][]() call. When this situation occurs, you need to wait for more data to arrive, after which you start a new transaction. If the data stream has read corrupt data or any of the inner transactions was aborted, this function aborts the transaction.

This function was introduced in Qt 5.7.

**See also** [startTransaction][](), [rollbackTransaction][](), and [abortTransaction][]().

### [QIODevice][] \*QDataStream::device() const ###

Returns the I/O device currently set, or `nullptr` if no device is currently set.

**See also** [setDevice][]().

### [QDataStream::FloatingPointPrecision][QDataStream_FloatingPointPrecision] QDataStream::floatingPointPrecision() const ###

Returns the floating point precision of the data stream.

This function was introduced in Qt 4.6.

**See also** [FloatingPointPrecision][QDataStream_FloatingPointPrecision] and [setFloatingPointPrecision][]().

### [QDataStream][QDataStream 1] &QDataStream::readBytes(char \*&*s*, [uint][] &*l*) ###

Reads the buffer *s* from the stream and returns a reference to the stream.

The buffer *s* is allocated using `new []`. Destroy it with the `delete []` operator.

The *l* parameter is set to the length of the buffer. If the string read is empty, *l* is set to 0 and *s* is set to `nullptr`.

The serialization format is a quint32 length specifier first, then *l* bytes of data.

**See also** [readRawData][]() and [writeBytes][]().

### int QDataStream::readRawData(char \**s*, int *len*) ###

Reads at most *len* bytes from the stream into *s* and returns the number of bytes read. If an error occurs, this function returns -1.

The buffer *s* must be preallocated. The data is *not* decoded.

**See also** [readBytes][](), [QIODevice::read][QIODevice_read](), and [writeRawData][]().

### void QDataStream::resetStatus() ###

Resets the status of the data stream.

**See also** [Status][], [status][](), and [setStatus][]().

### void QDataStream::rollbackTransaction() ###

Reverts a read transaction.

This function is commonly used to rollback the transaction when an incomplete read was detected prior to committing the transaction.

If called on an inner transaction, reverting is delegated to the outermost transaction, and subsequently started inner transactions are forced to fail.

For the outermost transaction, restores the stream data to the point of the [startTransaction][]() call. If the data stream has read corrupt data or any of the inner transactions was aborted, this function aborts the transaction.

If the preceding stream operations were successful, sets the status of the data stream to

<table> 
 <tbody> 
 <tr> 
 <th>Constant</th> 
 <th>Description</th> 
 </tr> 
 <tr> 
 <td><code>ReadPastEnd</code></td> 
 <td>.</td> 
 </tr> 
 </tbody> 
</table>

This function was introduced in Qt 5.7.

**See also** [startTransaction][](), [commitTransaction][](), and [abortTransaction][]().

### void QDataStream::setByteOrder([QDataStream::ByteOrder][QDataStream_ByteOrder] *bo*) ###

Sets the serialization byte order to *bo*.

The *bo* parameter can be [QDataStream::BigEndian][QDataStream_ByteOrder] or [QDataStream::LittleEndian][QDataStream_ByteOrder].

The default setting is big endian. We recommend leaving this setting unless you have special requirements.

**See also** [byteOrder][]().

### void QDataStream::setDevice([QIODevice][] \**d*) ###

void QDataStream::setDevice([QIODevice][] \*d)

Sets the I/O device to *d*, which can be `nullptr` to unset to current I/O device.

**See also** [device][]().

### void QDataStream::setFloatingPointPrecision([QDataStream::FloatingPointPrecision][QDataStream_FloatingPointPrecision] *precision*) ###

Sets the floating point precision of the data stream to *precision*. If the floating point precision is [DoublePrecision][QDataStream_FloatingPointPrecision] and the version of the data stream is [Qt\_4\_6][Qt_4_6] or higher, all floating point numbers will be written and read with 64-bit precision. If the floating point precision is [SinglePrecision][QDataStream_FloatingPointPrecision] and the version is [Qt\_4\_6][Qt_4_6] or higher, all floating point numbers will be written and read with 32-bit precision.

For versions prior to [Qt\_4\_6][Qt_4_6], the precision of floating point numbers in the data stream depends on the stream operator called.

The default is [DoublePrecision][QDataStream_FloatingPointPrecision].

Note that this property does not affect the serialization or deserialization of `qfloat16` instances.

**Warning:** This property must be set to the same value on the object that writes and the object that reads the data stream.

This function was introduced in Qt 4.6.

**See also** [floatingPointPrecision][]().

### void QDataStream::setStatus([QDataStream::Status][Status] *status*) ###

Sets the status of the data stream to the *status* given.

Subsequent calls to setStatus() are ignored until [resetStatus][]() is called.

**See also** [Status][], [status][](), and [resetStatus][]().

### void QDataStream::setVersion(int *v*) ###

Sets the version number of the data serialization format to *v*, a value of the [Version][Qt_4_6] enum.

You don't *have* to set a version if you are using the current version of Qt, but for your own custom binary formats we recommend that you do; see [Versioning][] in the Detailed Description.

To accommodate new functionality, the datastream serialization format of some Qt classes has changed in some versions of Qt. If you want to read data that was created by an earlier version of Qt, or write data that can be read by a program that was compiled with an earlier version of Qt, use this function to modify the serialization format used by [QDataStream][].

The [Version][Qt_4_6] enum provides symbolic constants for the different versions of Qt. For example:

QDataStream out(file);
    out.setVersion(QDataStream::Qt_4_0);

**See also** [version][]() and [Version][Qt_4_6].

### int QDataStream::skipRawData(int *len*) ###

Skips *len* bytes from the device. Returns the number of bytes actually skipped, or -1 on error.

This is equivalent to calling [readRawData][]() on a buffer of length *len* and ignoring the buffer.

This function was introduced in Qt 4.1.

**See also** [QIODevice::seek][QIODevice_seek]().

### void QDataStream::startTransaction() ###

Starts a new read transaction on the stream.

Defines a restorable point within the sequence of read operations. For sequential devices, read data will be duplicated internally to allow recovery in case of incomplete reads. For random-access devices, this function saves the current position of the stream. Call [commitTransaction][](), [rollbackTransaction][](), or [abortTransaction][]() to finish the current transaction.

Once a transaction is started, subsequent calls to this function will make the transaction recursive. Inner transactions act as agents of the outermost transaction (i.e., report the status of read operations to the outermost transaction, which can restore the position of the stream).

**Note:** Restoring to the point of the nested startTransaction() call is not supported.

When an error occurs during a transaction (including an inner transaction failing), reading from the data stream is suspended (all subsequent read operations return empty/zero values) and subsequent inner transactions are forced to fail. Starting a new outermost transaction recovers from this state. This behavior makes it unnecessary to error-check every read operation separately.

This function was introduced in Qt 5.7.

**See also** [commitTransaction][](), [rollbackTransaction][](), and [abortTransaction][]().

### [QDataStream::Status][Status] QDataStream::status() const ###

Returns the status of the data stream.

**See also** [Status][], [setStatus][](), and [resetStatus][]().

### int QDataStream::version() const ###

Returns the version number of the data serialization format.

**See also** [setVersion][]() and [Version][Qt_4_6].

### [QDataStream][QDataStream 1] &QDataStream::writeBytes(const char \**s*, [uint][] *len*) ###

Writes the length specifier *len* and the buffer *s* to the stream and returns a reference to the stream.

The *len* is serialized as a quint32, followed by *len* bytes from *s*. Note that the data is *not* encoded.

**See also** [writeRawData][]() and [readBytes][]().

### int QDataStream::writeRawData(const char \**s*, int *len*) ###

Writes *len* bytes from *s* to the stream. Returns the number of bytes actually written, or -1 on error. The data is *not* encoded.

**See also** [writeBytes][](), [QIODevice::write][QIODevice_write](), and [readRawData][]().

### [QDataStream][QDataStream 1] &QDataStream::operator<<([qint8][] *i*) ###

Writes a signed byte, *i*, to the stream and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator<<([quint8][] *i*) ###

This is an overloaded function.

Writes an unsigned byte, *i*, to the stream and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator<<([qint16][] *i*) ###

This is an overloaded function.

Writes a signed 16-bit integer, *i*, to the stream and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator<<([quint16][] *i*) ###

This is an overloaded function.

Writes an unsigned 16-bit integer, *i*, to the stream and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator<<([qint32][] *i*) ###

This is an overloaded function.

Writes a signed 32-bit integer, *i*, to the stream and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator<<([quint32][] *i*) ###

This is an overloaded function.

Writes an unsigned integer, *i*, to the stream as a 32-bit unsigned integer (quint32). Returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator<<([qint64][] *i*) ###

This is an overloaded function.

Writes a signed 64-bit integer, *i*, to the stream and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator<<([quint64][] *i*) ###

This is an overloaded function.

Writes an unsigned 64-bit integer, *i*, to the stream and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator<<(std::nullptr\_t *ptr*) ###

This is an overloaded function.

Simulates writing a `std::nullptr_t`, *ptr*, to the stream and returns a reference to the stream. This function does not actually write anything to the stream, as `std::nullptr_t` values are stored as 0 bytes.

This function was introduced in Qt 5.9.

### [QDataStream][QDataStream 1] &QDataStream::operator<<(bool *i*) ###

Writes a boolean value, *i*, to the stream. Returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator<<(qfloat16 *f*) ###

This is an overloaded function.

Writes a floating point number, *f*, to the stream using the standard IEEE 754 format. Returns a reference to the stream.

This function was introduced in Qt 5.9.

### [QDataStream][QDataStream 1] &QDataStream::operator<<(float *f*) ###

This is an overloaded function.

Writes a floating point number, *f*, to the stream using the standard IEEE 754 format. Returns a reference to the stream.

**See also** [setFloatingPointPrecision][]().

### [QDataStream][QDataStream 1] &QDataStream::operator<<(double *f*) ###

This is an overloaded function.

Writes a floating point number, *f*, to the stream using the standard IEEE 754 format. Returns a reference to the stream.

**See also** [setFloatingPointPrecision][]().

### [QDataStream][QDataStream 1] &QDataStream::operator<<(const char \**s*) ###

This is an overloaded function.

Writes the '\\0'-terminated string *s* to the stream and returns a reference to the stream.

The string is serialized using `writeBytes()`.

**See also** [writeBytes][]() and [writeRawData][]().

### [QDataStream][QDataStream 1] &QDataStream::operator>>([qint8][] &*i*) ###

Reads a signed byte from the stream into *i*, and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator>>([quint8][] &*i*) ###

This is an overloaded function.

Reads an unsigned byte from the stream into *i*, and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator>>([qint16][] &*i*) ###

This is an overloaded function.

Reads a signed 16-bit integer from the stream into *i*, and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator>>([quint16][] &*i*) ###

This is an overloaded function.

Reads an unsigned 16-bit integer from the stream into *i*, and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator>>([qint32][] &*i*) ###

This is an overloaded function.

Reads a signed 32-bit integer from the stream into *i*, and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator>>([quint32][] &*i*) ###

This is an overloaded function.

Reads an unsigned 32-bit integer from the stream into *i*, and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator>>([qint64][] &*i*) ###

This is an overloaded function.

Reads a signed 64-bit integer from the stream into *i*, and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator>>([quint64][] &*i*) ###

This is an overloaded function.

Reads an unsigned 64-bit integer from the stream, into *i*, and returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator>>(std::nullptr\_t &*ptr*) ###

This is an overloaded function.

Simulates reading a `std::nullptr_t` from the stream into *ptr* and returns a reference to the stream. This function does not actually read anything from the stream, as `std::nullptr_t` values are stored as 0 bytes.

This function was introduced in Qt 5.9.

### [QDataStream][QDataStream 1] &QDataStream::operator>>(bool &*i*) ###

Reads a boolean value from the stream into *i*. Returns a reference to the stream.

### [QDataStream][QDataStream 1] &QDataStream::operator>>(qfloat16 &*f*) ###

This is an overloaded function.

Reads a floating point number from the stream into *f*, using the standard IEEE 754 format. Returns a reference to the stream.

This function was introduced in Qt 5.9.

### [QDataStream][QDataStream 1] &QDataStream::operator>>(float &*f*) ###

This is an overloaded function.

Reads a floating point number from the stream into *f*, using the standard IEEE 754 format. Returns a reference to the stream.

**See also** [setFloatingPointPrecision][]().

### [QDataStream][QDataStream 1] &QDataStream::operator>>(double &*f*) ###

This is an overloaded function.

Reads a floating point number from the stream into *f*, using the standard IEEE 754 format. Returns a reference to the stream.

**See also** [setFloatingPointPrecision][]().

### [QDataStream][QDataStream 1] &QDataStream::operator>>(char \*&*s*) ###

This is an overloaded function.

Reads the '\\0'-terminated string *s* from the stream and returns a reference to the stream.

The string is deserialized using `readBytes()`.

Space for the string is allocated using `new []` \-- the caller must destroy it with `delete []`.

**See also** [readBytes][]() and [readRawData][]().

[QDataStream]: https://doc.qt.io/archives/qt-5.13/qdatastream.html
[QIODevice]: https://doc.qt.io/archives/qt-5.13/qiodevice.html
[...]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#details
[Link 1]: https://doc.qt.io/archives/qt-5.13/qdatastream-members.html
[Link 2]: https://doc.qt.io/archives/qt-5.13/qdatastream-obsolete.html
[Link 3]: https://doc.qt.io/archives/qt-5.13/threads-reentrancy.html
[Link 4]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#raw
[QTextStream]: https://doc.qt.io/archives/qt-5.13/qtextstream.html
[QFile]: https://doc.qt.io/archives/qt-5.13/qfile.html
[QBrush]: https://doc.qt.io/archives/qt-5.13/qbrush.html
[QColor]: https://doc.qt.io/archives/qt-5.13/qcolor.html
[QDateTime]: https://doc.qt.io/archives/qt-5.13/qdatetime.html
[QFont]: https://doc.qt.io/archives/qt-5.13/qfont.html
[QPixmap]: https://doc.qt.io/archives/qt-5.13/qpixmap.html
[QString]: https://doc.qt.io/archives/qt-5.13/qstring.html
[QVariant]: https://doc.qt.io/archives/qt-5.13/qvariant.html
[Qt]: https://doc.qt.io/archives/qt-5.13/datastreamformat.html
[setDevice]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#setDevice
[atEnd]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#atEnd
[Qt_4_6]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#Version-enum
[setFloatingPointPrecision]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#setFloatingPointPrecision
[floatingPointPrecision]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#floatingPointPrecision
[setVersion]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#setVersion
[version]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#version
[QByteArray]: https://doc.qt.io/archives/qt-5.13/qbytearray.html
[QBuffer]: https://doc.qt.io/archives/qt-5.13/qbuffer.html
[QIODevice_OpenMode]: https://doc.qt.io/archives/qt-5.13/qiodevice.html#OpenModeFlag-enum
[device]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#device
[startTransaction]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#startTransaction
[commitTransaction]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#commitTransaction
[rollbackTransaction]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#rollbackTransaction
[QIODevice_atEnd]: https://doc.qt.io/archives/qt-5.13/qiodevice.html#atEnd
[QDataStream_ByteOrder]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#ByteOrder-enum
[setByteOrder]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#setByteOrder
[abortTransaction]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#abortTransaction
[QDataStream_FloatingPointPrecision]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#FloatingPointPrecision-enum
[QDataStream 1]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#QDataStream
[uint]: https://doc.qt.io/archives/qt-5.13/qtglobal.html#uint-typedef
[readRawData]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#readRawData
[writeBytes]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#writeBytes
[readBytes]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#readBytes
[QIODevice_read]: https://doc.qt.io/archives/qt-5.13/qiodevice.html#read
[writeRawData]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#writeRawData
[Status]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#Status-enum
[status]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#status
[setStatus]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#setStatus
[byteOrder]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#byteOrder
[resetStatus]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#resetStatus
[Versioning]: https://doc.qt.io/archives/qt-5.13/qdatastream.html#versioning
[QIODevice_seek]: https://doc.qt.io/archives/qt-5.13/qiodevice.html#seek
[QIODevice_write]: https://doc.qt.io/archives/qt-5.13/qiodevice.html#write
[qint8]: https://doc.qt.io/archives/qt-5.13/qtglobal.html#qint8-typedef
[quint8]: https://doc.qt.io/archives/qt-5.13/qtglobal.html#quint8-typedef
[qint16]: https://doc.qt.io/archives/qt-5.13/qtglobal.html#qint16-typedef
[quint16]: https://doc.qt.io/archives/qt-5.13/qtglobal.html#quint16-typedef
[qint32]: https://doc.qt.io/archives/qt-5.13/qtglobal.html#qint32-typedef
[quint32]: https://doc.qt.io/archives/qt-5.13/qtglobal.html#quint32-typedef
[qint64]: https://doc.qt.io/archives/qt-5.13/qtglobal.html#qint64-typedef
[quint64]: https://doc.qt.io/archives/qt-5.13/qtglobal.html#quint64-typedef