Introduction to Design Patterns in C++ with Qt, 2nd Edition

Chapter 17: Concurrency

QProcess and QThread provide two approaches to concurrency. This chapter discusses how to create and communicate with processes and threads and offers techniques for monitoring and debugging them.

17.1 QProcess and Process Control

QProcess is a convenient (and cross-platform) class for starting and controlling other processes. It is derived from QObject and takes full advantage of signals and slots to make it easier to “hook up” with other Qt classes.

Now consider a simple example that starts a process and views its continually running output.¹ Example 17.1 shows the definition of a simple class derived from QProcess.

Example 17.1 src/logtail/logtail.h

[ . . . . ]#include <QObject>#include <QProcess>class LogTail : public ...