about timesetevent

"bookwei" <weber0710@yahoo.com.tw>
9 Jul 2006 21:29:44 -0700
I'm using DAQ card to get data,I need a timer to do it
I code a timesetevent and a callback function
but when I executes the program
I got a error message " cannot written "
so...wanna asking about the timesetevent statement has any error?

#include <mmsystem.h>

/*callback function*/

dwUser, DWORD dw1, DWORD dw)
CAI_TIMEDlg* User;
//warning C4101: 'User' : unreferenced local variable

//warning C4551: function call missing argument list

/*a button to start timer*/

void CAI_TIMEDlg::OnBNStart()
    UINT i_Scantime;
    CString cs_Scantime;
    m_OK.EnableWindow( FALSE );
    m_Read.EnableWindow( TRUE );
    m_Start.EnableWindow( FALSE );
    m_Stop.EnableWindow( TRUE );
    m_DaqAi.SetOverallInputRange( m_InputRange.GetCurSel());
    m_EScanTime.GetWindowText( cs_Scantime );
    i_Scantime = atoi( cs_Scantime );



/*a button to close timer*/

void CAI_TIMEDlg::OnBNStop()
    m_OK.EnableWindow( TRUE );
    m_Read.EnableWindow( TRUE );
    m_Start.EnableWindow( TRUE );
    m_Stop.EnableWindow( FALSE );

    timeKillEvent(wTimerID); // cancel the event
    wTimerID = 0;


void CAI_TIMEDlg::OnTimer()
   int i_Channel;
   float vReading;
   char buffer[10] ;
   FILE *out;
   vReading = m_DaqAi.RealInput( i_Channel );
// warning C4700: local variable 'i_Channel' used without having been

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