C / C++ / MFC

yu-jian wrote:

but the CTreeCtrl is disabled, I do not know why. Is there anyone know why it is.

CPoint point;
GetCursorPos(&point);
this->ScreenToClient(&point);
CRect  rect;
rect.top = point.y;
rect.left = point.x;
rect.right = rect.left + 200;
rect.bottom = rect.top  + 300;

CComboBox* pComboBox = new CComboBox();
pComboBox->Create(WS_VISIBLE, rect, this, NULL);
pComboBox->ShowWindow(SW_SHOW);

CDeviceInfoArray  arrDeviceInfo;
          ...

    for(int i = 0; i < arrDeviceInfo.GetCount(); ++i)
    {
        CString  strDevice;
        strDevice.Format("%d", arrDeviceInfo[i]);

        pComboBox->AddString(strDevice);
    }