subject_40980.htm

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序号：40980 发表者：黄豆豆 发表日期：2003-05-22 20:31:42
<br>主题：WM_TIMER事件的困惑,求教
<br>内容：WM_TIMER事件的困惑<BR>我用如下程序在我的P4计算机上运行几分钟都算计时正确，但在办公室的P3计算机上就完全不正确了，计时时间比实际流逝时间少多了（比如实际开始计时已经2秒了，我的程序才显示0.68秒）。<BR>请问有其他更好的方法做这种记时工作吗：）<BR><BR><BR>m_ctrlJiShi计时按钮控件<BR>m_ctrlEdit显示计时时间的EDIT控件<BR>m_nMs无符号的整形数<BR>m_strTime类Cstring对象<BR><BR>void CMyDlg::OnStartjishi() //开始计时<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;// TODO: Add your control notification handler code here<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString str;<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_ctrlJiShi.GetWindowText( str );<BR>&nbsp;&nbsp;&nbsp;&nbsp;if ( str == "记时" )<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SetTimer( 100, 10, NULL );//间隔时间越短越不正确<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_ctrlJiShi.SetWindowText( "停止" );<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;else<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;KillTimer( 100 );<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_ctrlJiShi.SetWindowText( "记时" );<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>}<BR><BR>void CMyDlg::OnTimer(UINT nIDEvent) <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;// TODO: Add your message handler code here and/or call default<BR>&nbsp;&nbsp;&nbsp;&nbsp;if ( nIDEvent == 100 )<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_nMs += 10;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_strTime.Format( "%.2f", m_nMs / 1000.0 );//显示计时时间（百分秒）<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_ctrlEdit.SetWindowText( m_strTime );<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;CDialog::OnTimer(nIDEvent);<BR>}<BR><BR>void CMyDlg::OnClear() <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;// TODO: Add your control notification handler code here<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_nMs = 0;<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_strTime.Format( "%.2f", m_nMs / 1000.0 );<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_ctrlEdit.SetWindowText( m_strTime );<BR>}<BR>
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回复者：擎天柱 回复日期：2003-05-22 20:37:20
<br>内容：OnTimer不很准确，最好使用多媒体定时器。<BR><BR>参考：<BR>http://www.codeguru.com/multimedia/mmTimers.shtml
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回复者：黄豆豆 回复日期：2003-05-22 21:00:41
<br>内容：大哥，你给的网页中有如下的说明：Multimedia timer was designed for 16-bit Windows, such as Windows 3.1. It will cause serious problem in Windows 95 and above. You can see MSDN to ensure this.是真的吗：）<BR>能给我更详细地说明吗 <BR>谢谢<BR>谢谢！！ 
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回复者：擎天柱 回复日期：2003-05-22 21:19:45
<br>内容：在google中查找“多媒体定时器”，你会发现你所需要的。
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回复者：剑月明 回复日期：2003-05-23 12:35:42
<br>内容：这有篇文章。。。。。<BR><BR>1.前言。