qthread

In-depth understanding of QT QthreadBefore understanding Qthread, you need to understand the following Qthread class, Qthread has the following resources (excerpt from the QT 5.1 help document): In the above resources, this article focuses on the slot: start (); signal: Started (), finished () ; protected method: Run (), exec ();Understanding QthreadQthread is ve

[Qt learning] multi-threaded Qthread operations I,QThread class overview The QThread class provides a platform-independent way for users to manage multithreading. # Include Inherited from QObject class II,QThread class details The QThread object manages the control thre

Overview The Qthread class provides a platform-independent way to manage threads. A Qthread object manages a thread. The execution of Qthread begins with the execution of the run () function, and in the Qthread class of Qt, the run () function initiates the event loop mechanism by invoking the Exec () function, and pr

Let qtimer run in other threads. The general statement is as follows. 1. Specify a timer for the worker thread in main thread. QThread* thread = new QThread(this);thread->start();QTimer *timer = new QTimer(0);timer->setInterval(100);timer->moveToThread(thread);connect(timer, SIGNAL(timeout()), this, SLOT(onTimeout()), Qt::DirectConnection);connect(thread, SIGNAL(started()), timer,SLOT(start())); 　　 Note the

In gemfield's article "from pthread to qthread", we learned about the basic usage of threads, but most of the content was said to be discussed in this article, that is, thread synchronization. Gemfield has a metaphor in "from process to thread", so it is necessary to review it below: * ********************************* to summarize the following: 1. A process is like a person in a house. 2. The clone creation thread is equivalent to adding a person to

Traditional graphical interface applications have only one thread to execute and one operation at a time. If the user invokes a more time-consuming operation, the interface response is frozen. One solution is to follow the event-handling approach: call void Qapplication::p rocessevents () or void Qapplication::p rocessevents (int maxtime) to force an event loop, but this approach is potentially risky. According to Qcoreapplication:processevents (), it is possible to cause recursion, result

applications.The solution depends on the purpose of the new thread and the thread lifecycle. Lifecycle Development Task Solution One call Run a function in another thread and exit the thread when the function is completed. Write Functions and useQtconcurrent: RunRun it Derived qrunnable, useQthreadpool: globalinstance ()-> Start ()Run it Derive qthread and implement it againQthread: Run (), UseQthread:

Learning Qthread is mainly to imitate the VC under the FTP server to write a QT version. Not much to say,.　　The software structure of the FTP server has been explained in the above analysis, the solution today is to let each client process can be a thread to run alone. First, the above 3 classes of CPP file, and then give the phenomenon.1, Qlistensocket class1#include"qlistensocket.h"2#include 3#include 4 5Qlistensocket::qlistensocket (Qobject *parent

. Let's talk about the idea first:The timer object needs to run in a thread that turns on the event loop, so we can move it to a thread that has the event loop turned on by the Movetothread () method. Very happy, we quickly encapsulated a timer class, containing a Qtimer and Qthread object, directly using the Qthread object is because my QT version is 4.8.3,run () is not a pure virtual function, the event l

voidQthread::run () {(void) exec ();}intqthread::exec () {q_d (qthread); Qmutexlocker Locker (d->mutex); D->data->quitnow =false; if(d->exited) {D->exited =false; returnD->ReturnCode; } locker.unlock (); Qeventloop EventLoop; intReturnCode =eventloop.exec (); Locker.relock (); D->exited =false; D->returncode =-1; returnReturnCode;}voidQthread::exit (intReturnCode) {q_d (qthread); Qmutexlocker Lo

Create a child thread, traverse the folder, and print the information on the main interface.1. Subclass Qthread can generate a new thread and refactor virtual function run (). A child thread communicates with the main thread using the Signal-slot mechanism, which sends the information through the emit signal ("information") to the main threadClass Newthread:public Qthread{Q_objectPublic:newthread (const QSt

First, I would like to quote Bruce Eckel's statement: "to understand the concept of a thread, we should use the process-oriented programming idea instead of the object-oriented programming idea ". Then, the last two sections of code: 1. Code for slot call // Threadslottest. h # ifndef threadslottest_h # define threadslottest_h # include 2. Code without slot calls // Threadslottest. h # ifndef threadslottest_h # define threadslottest_h # include The two pieces of code are only different from

Workthread, which generally inherits Qthread, creates a temporary workobject in the overloaded run (), which determines whether the workobject is used in the thread So what if this workobject is a singleton? Method 2: Use Workobject in Qthread1. Create Workobject1#include 2#include 3#include 4 5 #defineDEBUG (x)6 {7Qdebug () "class Name:""\ n"8"function:""\ n" 9"Thread id ="Qthread::currentthreadid

A qthread example // Threadtest. h# Ifndef threadtest_h# Define threadtest_h # Include # Include "test. H" Class mythread: Public qthread{Protected:Virtual void run ();}; Mythread; Void test: newslot (){Mythread. Start ();} # Endif //////////////////////////////// // Threadtest. cpp # Include Void mythread: Run (){For (INT I = 0; I {Printf ("new value I is: % d", I );// Qmessagebox: Information (this, TR (

First, let's talk about the background of the story. When we click a button or something like a control, we may want it to perform complicated operations, however, we do not want the program to be stuck there and wait for the execution of this complex operation to end. multithreading is required here. Although I still don't know how to use multithreading in QT, however, let's make it a summary for future reference. It is said that it is a good method to implement multithreading on many websites!

In fact, the two can work together normally.The only drawback is that logging displays such records. 2011 - 07 - 02 23 : 14 : 18 , 154 - Dummy-1 - Thread - Debug - This Is Qthread_1 output 2011 - 07 - 02 23 : 14 : 18 , 467 - Dummy-2 - Thread - Debug - This Is Qthread_2 output 2011 - 07 - 02 23 : 14 : 18 , 811 - Dummy-1 - Thread - Debug - This Is Qthread_1 output 2011 - 07 - 02 23 : 14 : 19 , 217 -