如何在我的 mfc 应用程序的非对话框 .cpp 中使用 SetTimer？

发布于 2024-11-25 05:41:44 字数 503 浏览 0 评论 0原文

我的问题是针对普通的 mfc SetTimer，如下所示

void CTimersDlg::OnButtonBegin()
{
    // create the timer

    SetTimer(m_nTimerID, uElapse, NULL);
}

void CTimersDlg::OnButtonStop()
{
    // destroy the timer
      KillTimer(m_nTimerID);
}

void CTimersDlg::OnTimer(UINT nIDEvent)  // called every uElapse milliseconds
{
    // do something, but quickly
    CDialog::OnTimer(nIDEvent);
}

，但如果我需要在非dialog.cpp 中使用 SetTimer，例如在我的 sender.cpp 中如何创建计时器？就像在 SetTimer 字段中一样，处理程序（回调）函数？

原文

My question is for normal mfc SetTimer, as follows

void CTimersDlg::OnButtonBegin()
{
    // create the timer

    SetTimer(m_nTimerID, uElapse, NULL);
}

void CTimersDlg::OnButtonStop()
{
    // destroy the timer
      KillTimer(m_nTimerID);
}

void CTimersDlg::OnTimer(UINT nIDEvent)  // called every uElapse milliseconds
{
    // do something, but quickly
    CDialog::OnTimer(nIDEvent);
}

but if I need to use SetTimer in non dialog.cpp, for example in my sender.cpp
how do I create the timer? As in the SetTimer fields, the handler(callback) function?

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爱本泡沫多脆弱 2024-12-02 05:41:44

您可以传递 NULL 作为窗口句柄，并在对 SetTimer 的调用中包含回调函数。这将允许您接收计时器通知，而无需将其与特定窗口关联。

如果计时器打算在单独的“工作”线程（没有窗口的线程）中使用，您仍然需要处理消息队列才能接收计时器通知。如果您使用 CWinThread 对象创建线程，则在 CWinThread::Run 的默认实现中已经为您处理了这一点。

如果您可以更新您的问题以包含有关 sender.cpp 内容的更多信息，我可以提供一个更合适的示例。这使用普通的 Windows API 来创建计时器并处理所需的调度队列。

// Example only.
VOID CALLBACK timerCallback(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)
{
    printf("Timer called\n");
}

void SomeFunc()
{
    SetTimer(NULL, 1, 1000, timerCallback);

    MSG msg;

    // msg-pump
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
}

You can pass NULL as the window handle and include callback function in the call to SetTimer. This will allow you to receive timer notifications without associating it with a specific window.

If the timer is intended to be used in a separate "worker" thread (one without a window) you will still need to process the message queue in order to receive timer notifications. If you are creating a thread using a CWinThread object this is already handled for you in the default implementation of CWinThread::Run.

If you can update your question to include more information about the contents of sender.cpp I can provide a more suitable example. This uses the plain Windows API to create a timer and handle the required dispatch queue.

// Example only.
VOID CALLBACK timerCallback(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)
{
    printf("Timer called\n");
}

void SomeFunc()
{
    SetTimer(NULL, 1, 1000, timerCallback);

    MSG msg;

    // msg-pump
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
}

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