multithreading qt 如何将我的函数放入一个线程中
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qt How to put my function into a thread
提问by Eagle King
I'm a QT newbie. I have a class extend from widget like:
我是QT新手。我有一个从小部件扩展的类，例如：
class myclass: public Qwidget
{
Q_OBJECT
public:
void myfunction(int);
slots:
void myslot(int)
{
//Here I want to put myfunction into a thread
}
...
}
I don't know how to do it. Please help me.
我不知道该怎么做。请帮我。
回答by RedX
Add a QThreadmember then in myslotmove your object to the thread and run the function.
添加一个QThread成员，然后myslot将您的对象移动到线程并运行该函数。
class myclass: public Qwidget
{
QThread thread;
public:
slots:
void myfunction(int); //changed to slot
void myslot(int)
{
//Here I want to put myfunction into a thread
moveToThread(&thread);
connect(&thread, SIGNAL(started()), this, SLOT(myfunction())); //cant have parameter sorry, when using connect
thread.start();
}
...
}
My answer is basically the same as from this post: Is it possible to implement polling with QThread without subclassing it?
我的回答与这篇文章基本相同：Is it possible to implement polling with QThread without subclassing it?
回答by O.C.
Your question is very broad . Please find some alternatives that could be beneficial to you :
你的问题很广泛。请找到一些可能对您有益的替代方案：
- If you want to use signal/slot mechanism and execute your slot within a thread context you can use moveToThreadmethod to move your object into a thread (or create it directly within the run method of QThread) and execute your slot within that thread's context. But Qt Docs says that
- 如果您想使用信号/插槽机制并在线程上下文中执行您的插槽，您可以使用moveToThread方法将您的对象移动到一个线程中（或直接在 QThread 的 run 方法中创建它）并在该线程的上下文中执行您的插槽。但是 Qt Docs 说
The object cannot be moved if it has a parent.
如果对象有父对象，则无法移动对象。
Since your object is a widget, I assume that it will have a parent.
由于您的对象是一个小部件，我假设它会有一个父对象。
So it is unlikelythat this method will be useful for you.
因此，这种方法不太可能对您有用。
Another alternative is using QtConcurrent::run()This allows a method to be executed by another thread. However this way you can not use signal/slot mechanism. Since you declared your method as a slot. I assumed that you want to use this mechanism. If you don't carethen this method will be useful for you.
Finally you can create a QThreadsubclass within your slot and execute whatever your like there.
另一种选择是使用QtConcurrent::run()这允许一个方法由另一个线程执行。但是这样你就不能使用信号/插槽机制。由于您将方法声明为插槽。我假设您想使用这种机制。如果你不在乎，那么这个方法对你很有用。
最后，您可以在您的插槽中创建一个QThread子类并在那里执行您喜欢的任何操作。
This is all I could think of.
这就是我能想到的。
I hope this helps.
我希望这有帮助。
