无效使用非静态成员函数（在qt中） [英] invalid use of non-static member function( in qt)

问题描述

我在我的mainwindow.h类文件（header？）中创建了我的函数：

I've prototyped my function in my mainwindow.h class file(header?):

    class MainWindow : public QMainWindow
{
    Q_OBJECT

    public:
    void receiveP();

然后在我的main.cpp类文件中我告诉函数该做什么：

Then in my main.cpp class file I tell the function what to do:

void MainWindow::receiveP()
{
     dostuff
}

然后在main.cpp类文件的main函数中，我尝试在一个线程中使用它：

Then in the main function of my main.cpp class file I try to use it in a thread:

 std::thread t1(MainWindow::receiveP);
 t1.detach();

这给出了错误无效使用非静态成员函数void MainWindow :: receiveP ）'。

Which gives me the error "invalid use of non-static member function 'void MainWindow::receiveP()'.

推荐答案

您尝试传递一个成员函数指针到线程的构造函数

You're attempting to pass a member function pointer to the constructor of the thread class, which expects a normal (non-member) function pointer.

传递一个静态方法函数指针（或指向一个自由函数的指针） ）而是显式地给你的对象的实例：

Pass in a static method function pointer (or pointer to a free function) instead, and explicitly give it the instance of your object:

// Header:
static void receivePWrapper(MainWindow* window);

// Implementation:
void MainWindow::receivePWrapper(MainWindow* window)
{
    window->receiveP();
}

// Usage:
MainWindow* window = this;   // Or whatever the target window object is
std::thread t1(&MainWindow::receivePWrapper, window);
t1.detach();

确保线程终止之前您的窗口对象被销毁。

Make sure that the thread terminates before your window object is destructed.

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