请教RegisterWindowMessage函数的用法，最好给个实例

请教RegisterWindowMessage函数的用法，最好给个实例

.h文件中
class CTestDlg : public CDialog
{
public:
    CTestDlg(CWnd* pParent = NULL);    // standard constructor
    //{{AFX_DATA(CTestDlg)
    enum { IDD = IDD_TEST_DIALOG };
    CHy1000HD    m_hdATL;
    //}}AFX_DATA
    //{{AFX_VIRTUAL(CTestDlg)
    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
    //}}AFX_VIRTUAL
protected:
    HICON m_hIcon;
    //{{AFX_MSG(CTestDlg)
    virtual BOOL OnInitDialog();
    afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
    afx_msg void OnPaint();
    afx_msg HCURSOR OnQueryDragIcon();
    //}}AFX_MSG
    afx_msg LRESULT OnDataOK(WPARAM, LPARAM);
    DECLARE_MESSAGE_MAP()
};

.cpp中

CTestDlg::CTestDlg(CWnd* pParent )
    : CDialog(CTestDlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CTestDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
}

UINT WM_DATAOK = RegisterWindowMessage("WM_HY1000DATAOK");
const IID IID_IHy1000Sim = {0xC11E3D49,0x768F,0x4094,{0xAB,0x01,0x8D,0xED,0x8E,0xC5,0x71,0xA8}};

BEGIN_MESSAGE_MAP(CTestDlg, CDialog)
    //{{AFX_MSG_MAP(CTestDlg)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_BTN_START, OnBtnStart)
    //}}AFX_MSG_MAP
    ON_REGISTERED_MESSAGE( WM_DATAOK , OnDataOK )
END_MESSAGE_MAP()

LRESULT CTestDlg::OnDataOK(WPARAM wp, LPARAM lp)
{
    float *pBuf = ( float * )wp;
    long           nLen = (long)lp;
    float depth = *pBuf ;
    CString strDepth;
    strDepth.Format("%f",depth);
    CWnd *pWnd = GetDlgItem(IDC_EDITDEP);
    if ( pWnd && pWnd->GetSafeHwnd())
        pWnd->SetWindowText( strDepth);
    return TRUE ;

如图: 将公式 =offset(c1,sumproduct(max((a2:a13=e2)*(b2:b13=f2)*row(a2:a13)-1)),0) 粘贴至g2单元格即可,修改要查询的项目,效果如图: