我正在尝试在对象中创建线程,但是出现错误消息“&” ：对绑定成员函数表达式的非法操作.通过阅读,我看到我必须使成员函数静态化,但是当我这样做时,我收到一条错误消息,说’.dac_ping’的左边必须有class / struct / union

这是我正在尝试的：

class Dac 
    {
    private:
        network_com com;
        HANDLE  ping_thread;
        DWORD   dping_thread;

        static DWORD WINAPI ping_loop(void* param)
            {
            while ( com.dac_ping() == 0)
                Sleep(900);

            return 1; //since this is an infinite loop, if the loop breaks, it has failed
            }


    public:
        Dac()
            {
            }

        ~Dac()
            {
            }

        void find_dac()
            {
            com.find_dac();
            com.print_dac_info();
            }


        void connect_and_keep_alive()
            {
            if (com.dac_connect() == 0)
                ping_thread = CreateThread (NULL , 0, ping_loop, NULL, 0, &dping_thread);
            }

    };

解决方法:

静态函数未绑定到特定实例；没有此指针,并且您没有“成员变量”.您可以将此指针作为参数传递给函数,然后将其转换为Dac *并从中访问成员变量.

所以你可以做

ping_thread = CreateThread (NULL , 0, ping_loop, (LPVOID)this, 0, &dping_thread);

并将您的ping_loop更改为：

static DWORD WINAPI ping_loop(void* param)
{
    Dac* dac = (Dac*)param;
    while ( dac->com.dac_ping() == 0)
        Sleep(900);

    return 1; //since this is an infinite loop, if the loop breaks, it has failed
}