windows 下找到主线程ID

有时, 我们需要找出主线程. 下面示例代码给出windows下的一种方法:
原因很简单, 枚举当前进程的所有线程, 最早创建的那个必定是主线程.

        m_threadId = 0;
        FILETIME timeRunE = {0};
        const DWORD idProcess = GetCurrentProcessId();
        HANDLE hThreadSnap= ::CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, idProcess);//获取快照句柄
        if(hThreadSnap == INVALID_HANDLE_VALUE)//如果获取失败返回
            return;
        THREADENTRY32 pe32 = { sizeof(pe32) };//快照结构并给予大小
        if(::Thread32First(hThreadSnap, &pe32))
        {
            do
            {
                if ( pe32.th32OwnerProcessID == idProcess )//如果进程ID等于你想寻找的进程ID则返回主线程ID
                {
                    HANDLE handle = OpenThread(THREAD_SUSPEND_RESUME, FALSE,pe32.th32ThreadID);

                    FILETIME createtime,time2,time3,time4;
                    ::GetThreadTimes(handle,&createtime,&time2,&time3,&time4);
                    SYSTEMTIME realtime;
                    ::FileTimeToSystemTime(&createtime,&realtime);
                    if ( createtime.dwHighDateTime < timeRunE.dwHighDateTime
                        || (timeRunE.dwHighDateTime == 0 && timeRunE.dwLowDateTime == 0) )
                    {
                        m_threadId = pe32.th32ThreadID ;
                        timeRunE = createtime;
                    } else
                    if ( createtime.dwHighDateTime == timeRunE.dwHighDateTime &&
                        createtime.dwLowDateTime < timeRunE.dwLowDateTime )
                    {
                        m_threadId = pe32.th32ThreadID ;
                        timeRunE = createtime;
                    }
                }
            }while(::Thread32Next(hThreadSnap, &pe32));
        }//否则循环判断尾
        ::CloseHandle(hThreadSnap);