WM_TIMER消息来自哪里? [英] where does the WM_TIMER message come from?

问题描述

IMPLEMENT_DYNCREATE(CWorkThread, CWinThread)
CWorkThread::CWorkThread()
{
 m_uTimer = -1;
}
CWorkThread::~CWorkThread()
{
}
BOOL CWorkThread::InitInstance()
{
 // TODO: 在此执行任意逐线程初始化
 return TRUE;
}
int CWorkThread::ExitInstance()
{
 // TODO: 在此执行任意逐线程清理
 return CWinThread::ExitInstance();
}
void CWorkThread::OnTimer(WPARAM wp, LPARAM lp)
{
 KillTimer(NULL, m_uTimer);
 m_uTimer = UINT_PTR(-1);
 CTestDlg dlg;
 dlg.DoModal();
 m_uTimer = SetTimer(NULL, 1, 4000, NULL);
}
void CWorkThread::OnStartProcess(WPARAM wp, LPARAM lp)
{
 if (m_uTimer != UINT_PTR(-1))
 {
  KillTimer(NULL, m_uTimer);
  m_uTimer = UINT_PTR(-1);
 }
 m_uTimer = SetTimer(NULL, 1, 4000, NULL);
 int i=0;
}
BEGIN_MESSAGE_MAP(CWorkThread, CWinThread)
 ON_THREAD_MESSAGE(WM_TIMER, OnTimer)
 ON_THREAD_MESSAGE(WM_STARTPROCESS, OnStartProcess)
END_MESSAGE_MAP()

这是我的代码的一部分.计时器在Windows XP上可以正常运行，但是在7窗口上却无法正常运行.启动计时器后，将弹出一个对话框，除了外观外我什么也没做，并且对话框不断弹出.我的问题是，对话框第一次弹出时，计时器已停止，以下wm_timer消息从哪里来?

谢谢.

This is part of my code. The timer runs OK on windows xp,but it runs abnormally on window 7. When timer has been started, a dialog box pop up, and I don''t do anything except look, and the dialog box pop up continually. My question is when the dialog box first pop up,the timer has been stopped, where do the following wm_timer message come from?

thank you.

推荐答案

从代码中可以明显看出，在调用dlg.DoModal之后，您在计时器回调中一次又一次地设置了计时器.我不知道它如何在任何操作系统上工作.在计时器消息上显示模式对话框的整个想法看起来很奇怪，但这不是问题的根源.

—SA

It is apparent from your code that you set timer again and again inside timer callback after the call to dlg.DoModal. I have no idea how it could work in any OS. The whole idea to show a modal dialog on timer message looks weird, but this is not a source of your problem.

—SA

这是一个独立的线程，您确定在处理最后一条消息时另一个线程没有在调用WM_STARTPROCESS吗?您也不会检查KillTimer()是否成功，也不会检查WM_TIMER消息随附的计时器标识符.

http://msdn.microsoft.com/en-us/library/ms644902％28v = vs.85％29.aspx [ ^ ]

This is an independent thread, are you sure another thread isn''t calling WM_STARTPROCESS while you''re processing the last message? You''re also not checking if KillTimer() succeeded and not checking the timer identifier that comes in with the WM_TIMER message.

http://msdn.microsoft.com/en-us/library/ms644902%28v=vs.85%29.aspx[^]

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