如何在同一类(C ++，MFC)中调用工作线程? [英] How do i call worker thread in a same class (C++, MFC)?

问题描述

这是我的代码，其中包含错误:

Here is my code which contains error:

void ClassA::init()
{
    HANDLE hThread;
    data thread;          // "thread" is an object of struct data

    hThread = CreateThread(NULL, 0, C1::threadfn, &thread, 0, NULL);
}

DWORD WINAPI ClassA::threadfn(LPVOID lpParam)
{   
    data *lpData = (data*)lpParam;
}

错误:

error C3867: 'ClassA::threadfn': function call missing argument list; use '&ClassA::threadfn' to create a pointer to member

使工作线程在单个类中工作的正确方法是什么?

What is the proper way to make the worker thread working in a single class?

推荐答案

线程创建函数不了解C ++类；它只支持C ++类.这样，您的线程入口点必须是静态类成员函数或非成员函数.您可以将this指针作为lpvThreadParam参数传递给CreateThread()函数，然后让静态或非成员入口点函数仅通过该指针调用threadfn()函数.

The thread creation functions are not aware of C++ classes; as such, your thread entry point must be either a static class member function, or a non-member function. You can pass in the this pointer as the lpvThreadParam parameter to the CreateThread() function, then have the static or non-member entry point function simply call the threadfn() function via that pointer.

如果threadfn()函数 是静态的，请确保将&放在C1::threadfn之前.

If the threadfn() function is static, then make sure you put & before C1::threadfn.

这是一个简单的例子:

class MyClass {
  private:
    static DWORD WINAPI trampoline(LPVOID pSelf);
    DWORD threadBody();
  public:
    HANDLE startThread();
}

DWORD WINAPI MyClass::trampoline(LPVOID pSelf) {
  return ((MyClass)pSelf)->threadBody();
}

DWORD MyClass::threadBody() {
  // Do the actual work here
}

HANDLE MyClass::startThread() {
  return CreateThread(NULL, 0, &MyClass::trampoline, (LPVOID)this, 0, NULL);
}

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