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<td ><a href="index.html">Qt 5.9</a></td><td >Inter-Process Communication in Qt</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.5 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#tcp-ip">TCP/IP</a></li>
<li class="level1"><a href="#shared-memory">Shared Memory</a></li>
<li class="level1"><a href="#d-bus-protocol">D-Bus protocol</a></li>
<li class="level1"><a href="#qprocess-class">QProcess Class</a></li>
<li class="level1"><a href="#session-management">Session Management</a></li>
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<h1 class="title">Inter-Process Communication in Qt</h1>
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<p>Qt provides several ways to implement Inter-Process Communication (IPC) in Qt applications.</p>
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<h2 id="tcp-ip">TCP/IP</h2>
<p>The cross-platform <a href="../qtnetwork/qtnetwork-index.html">Qt Network</a> module provides classes that make network programming portable and easy. It offers high-level classes (e.g., <a href="../qtnetwork/qnetworkaccessmanager.html">QNetworkAccessManager</a>, QFtp) that communicate using specific application-level protocols, and lower-level classes (e.g., <a href="../qtnetwork/qtcpsocket.html">QTcpSocket</a>, <a href="../qtnetwork/qtcpserver.html">QTcpServer</a>, <a href="../qtnetwork/qsslsocket.html">QSslSocket</a>) for implementing protocols.</p>
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<h2 id="shared-memory">Shared Memory</h2>
<p>The cross-platform shared memory class, <a href="../qtcore/qsharedmemory.html">QSharedMemory</a>, provides access to the operating system's shared memory implementation. It allows safe access to shared memory segments by multiple threads and processes. Additionally, <a href="../qtcore/qsystemsemaphore.html">QSystemSemaphore</a> can be used to control access to resources shared by the system, as well as to communicate between processes.</p>
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<h2 id="d-bus-protocol">D-Bus protocol</h2>
<p>The <a href="../qtdbus/qtdbus-index.html">Qt D-Bus</a> module is a Unix-only library you can use to implement IPC using the D-Bus protocol. It extends Qt's <a href="../qtcore/signalsandslots.html">Signals and Slots</a> mechanism to the IPC level, allowing a signal emitted by one process to be connected to a slot in another process. The <a href="../qtdbus/qtdbus-index.html">Qt D-Bus</a> documentation has detailed information on how to use the <a href="../qtdbus/qtdbus-index.html">Qt D-Bus</a> module.</p>
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<p>The cross-platform class <a href="../qtcore/qprocess.html">QProcess</a> can be used to start external programs as child processes, and to communicate with them. It provides an API for monitoring and controlling the state of the child process. <a href="../qtcore/qprocess.html">QProcess</a> gives access to the input/output channels of child process by inheriting from <a href="../qtcore/qiodevice.html">QIODevice</a>.</p>
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<h2 id="session-management">Session Management</h2>
<p>In Linux/X11 platforms, Qt provides support for session management. Sessions allow events to be propagated to processes, for example, to notify when a shutdown occurs. The process and applications can then perform any necessary operations such as save open documents.</p>
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