函数调用丢失参数列表。

#include <iostream>
#include <Windows.h>
#include <process.h>
#include <time.h>
#include <conio.h>

using namespace std;
class Klasa
{
public:
    void petla(void* Args)
    {
        time_t tWait = clock() + 4 * CLOCKS_PER_SEC;
        for(;;)
        {
            cout << "Test dzialania watkow" << endl;
            Sleep(1000);
        }
        _endthread();
    }
};
void main()
{
    Klasa* pKlasa = new Klasa;
    time_t tCzas = clock() + 10 * CLOCKS_PER_SEC;
    _beginthread(pKlasa->petla, 0, NULL);
    while(tCzas>=clock())
    {
        cout << " Dziala" << endl;
        Sleep(500);
    }
    getch();
}

Error 1 error C3867: 'Klasa::petla': function call missing argument list; use '&Klasa::petla' to create a pointer to member c:\users\bartek\documents\visual studio 2012\projects\wątki\wątki\source.cpp 26 1 Wątki

错误1错误C3867:“Klasa::petla”:函数调用缺失参数列表;使用“&Klasa::petla”来创建一个指向成员c的指针:\ \用户\bartek\ \ \ \visual studio 2012\ tki\w tki\source。cpp 26 1 Wątki

This is an error and I don't know What shoud I do cause I can't put () in this beginthread(pKlasa->petla, 0, NULL); Guys please help me :C

这是一个错误，我不知道我要做什么，因为我不能把()在这个开始线程(pKlasa->petla, 0, NULL);请帮帮我:C。

4 个解决方案

#1

Klasa::petla needs to be declared static if you want it to be the entry point of a thread.

:如果你想让petla成为线程的入口点，它需要被声明为静态的。

The typical idiom for starting a thread within an object without leaking access to anything important or thread-dangerous looks something like this:

用于在对象中启动线程，而不泄漏任何重要或线程危险的线程的典型用法如下:

#include <iostream>
#include <Windows.h>
#include <process.h>
#include <time.h>

class Klasa
{
public:
    void Start();

private:
    static void ThreadEntry(void *p);
    void ThreadBody();
};

void Klasa::Start()
{
    _beginthread(Klasa::ThreadEntry, 0, this);
}

void Klasa::ThreadEntry(void *p)
{
    ((Klasa *) p)->ThreadBody();
    _endthread();
    return;
}

void Klasa::ThreadBody()
{
    // do threaded action here
    time_t tWait = clock() + 4 * CLOCKS_PER_SEC;
    for(;;)
    {
        cout << "Test dzialania watkow" << endl;
        Sleep(1000);
    }
}

void main()
{
    Klasa k;
    k.Start();

    time_t tCzas = clock() + 10 * CLOCKS_PER_SEC;
    while(tCzas>=clock())
    {
        cout << " Dziala" << endl;
        Sleep(500);
    }

    char c;
    c << std::cin; // stick to either cin/cout or C-style IO, not both
}

At least, that's how I tend to do it using pthreads. I'd imagine it's basically the same with windows threads.

至少，这是我使用pthreads的方式。我想它基本上和windows线程是一样的。

Also, please try to avoid using Hungarian Notation. It's personal preference, but there are a lot of good arguments for not using it (like the fact that C++ is strongly typed and the type of every variable or function is apparent from its definition).

另外，请尽量避免使用匈牙利符号。这是个人偏好，但是有很多很好的理由不使用它(比如，c++是强类型的，而且每个变量或函数的类型从定义中都很明显)。

#2

From the documentation:

从文档:

uintptr_t _beginthread( 
   void( *start_address )( void * ),
   unsigned stack_size,
   void *arglist 
);

So that function takes a pointer to function, and not a pointer-to-member. You can't convert between the two.

所以这个函数需要一个指针来函数，而不是一个pointerto -member。你不能在两者之间转换。

Either use a static member function (which is tied to the class instead of an instance) or create a non-member function.

要么使用静态成员函数(它与类绑定而不是实例)，要么创建一个非成员函数。

#3

You must pass an address of function.

你必须通过一个功能地址。

You cannot write though

不过你不能写

_beginthread(&(pKlasa->petla), 0, NULL);

because _beginthread wants pointer to a function, not a pointer to an object's method. Define a plain function with the required signature:

因为_beginthread需要指向函数的指针，而不是指向对象方法的指针。定义一个具有所需签名的简单函数:

void threadfunc(void *data) {
  reinterpret_cast<Klasa*>(data)->petla();
}

and then begin a new thread with

然后开始一个新的线程。

_beginthread(threadfunc, 0, pKlasa);

#4

std::thread(&Klasa::petla, pKlasa);

if you don't have a C++11 library you can do the same with Boost.

如果你没有一个c++ 11库，你可以用Boost来做同样的事情。

#1