I am programming the windows base application using MFC. when I was trying to use ON_CONTROL_RANGE function there is an error message popped up.

Visual Studio was used to build the app.

error

E0171 invalid type conversion

why is this error comes up, give me a hint

Code

#define IDC_USR_MANUAL_TUNING_CH1_CHECK 1134
#define IDC_USR_MANUAL_TUNING_CH7_CHECK 1140

ON_CONTROL_RANGE(BN_CLICKED, IDC_USR_MANUAL_TUNING_CH1_CHECK, IDC_USR_MANUAL_TUNING_CH8_CHECK, OnUsrManualTuningChCheck) 


void CMainteManualTuningDialog::OnUsrManualTuningChCheck(int nId)
{
    if (FALSE == m_bInitFlag)       // Initialization flag TRUE: Initialized / FALSE: Uninitialized
    {
        return;
    }

    UpdateData(TRUE);

    int nChCnt = nId - IDC_USR_MANUAL_TUNING_CH1_CHECK;
    if ((CH1 > nChCnt) || (CH8 < nChCnt))
    {
        return;
    }
    // unused
    if (FALSE == m_bUseCheck[nChCnt])
    {
        if (nChCnt == m_rbutCh)
        {
            MessageBox("While selecting a channel, it cannot be invalidated.");
            m_bUseCheck[nChCnt] = TRUE;     // invalid
        }
        else
        {
            m_butUseCheck[nChCnt].SetWindowText(MSG_IGNORE);    // Ignore
            m_butChSel[nChCnt].EnableWindow(FALSE);         // invalid
            g_eTuningStat[nChCnt] = E_TUNING_STAT_NONE;         // unused
            m_strStatCh[nChCnt] = MSG_NONE;                     // unused
            if (FALSE == m_clp->ZeroSetSend(nChCnt, m_pcTuningData))
            {
                ((CMicroDetectorView*)m_hpView)->PostMessage(WM_USR_ALARM, eAPP_T);
            }
        }
    }
    // use
    else
    {
        m_butUseCheck[nChCnt].SetWindowText(MSG_USE);   // Use
        m_butChSel[nChCnt].EnableWindow(TRUE);      // Effectiveness
        // Unadjusted the adjustment status
        SetStatStill(nChCnt);
    }

    UpdateData(FALSE);
}

CodePudding user response：

when we use the ON_CONTROL_RANGE(wNotifyCode, id, idLast, memberFxn) memberFxn Fn has to use UINT variables