C / C++ / MFC

in the View Class:
...
  CDateTimeDlg dlg;
  CTime timeNewDateTime;

  dlg.m_DateTime = CTime::GetCurrentTime();
  if(dlg.DoModal() == IDOK)
    timeNewDateTime = dlg.m_DateTime;

======================
in the CDateTimeDlg class:
in the .h file:
...
public:
  CDateTimeDlg(CWnd *pParent = NULL);   // standard constructor
  CTime m_DateTime;
  // Dialog Data
  //{{AFX_DATA(CDateTimeDlg)
  enum { IDD = IDD_DATETIME_DLG };
  CDateTimeCtrl m_cDateTime;
  //}}AFX_DATA

in the .cpp file:
...
void CDateTimeDlg::DoDataExchange(CDataExchange* pDX)
{
  CDialog::DoDataExchange(pDX);
  //{{AFX_DATA_MAP(CDateTimeDlg)
  DDX_Control(pDX, IDC_DATETIME, m_cDateTime);
  //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CDateTimeDlg, CDialog)
  //{{AFX_MSG_MAP(CDateTimeDlg)
  ON_NOTIFY(DTN_DATETIMECHANGE, IDC_DATETIME, OnDatetimechangeDateTime)
  //}}AFX_MSG_MAP
END_MESSAGE_MAP()
...
BOOL CDateTimeDlg::OnInitDialog() 
{
  CDialog::OnInitDialog();

  m_cDateTime.SetFormat("MM/dd/yyyy HH:mm:ss");
  m_cDateTime.SetTime(&m_DateTime);
  return TRUE;  // return TRUE unless you set the focus to a control
                // EXCEPTION: OCX Property Pages should return FALSE
}

void CDateTimeDlg::OnDatetimechangeDateTime(NMHDR *pNMHDR, LRESULT *pResult) 
{
  m_cDateTime.GetTime(m_DateTime);
  *pResult = 0;
}

<br />
// get attributes<br />
DWORD dwAttributes = GetFileAttributes("C:\\asdf\\fdsa");<br />
<br />
// if value is -1, it does not exist<br />
if( dwAttributes != (DWORD)-1 ){<br />
<br />
  // make sure it is directory and NOT a file...<br />
  if( dwAttributes & FILE_ATTRIBUTE_DIRECTORY ){<br />
    // you are okay, it exists AND it is a directory<br />
  } else {<br />
    // could be a problem - a file 'C:\asdf\fdsa' is sitting there - NOT a folder<br />
  }<br />
<br />
} else {<br />
<br />
  // nothing is there go ahead and create your folder now...<br />
  // although the TRULY paranoid of you will verify that C:\asdf<br />
  // is TRULY a folder at this point...<br />
  dwAttributes = GetFileAttributes("C:\\asdf");<br />
<br />
  if( dwAttributes != (DWORD)-1 ){<br />
    // make sure it is directory and NOT a file...<br />
    if( dwAttributes & FILE_ATTRIBUTE_DIRECTORY ){<br />
      // you are okay, it exists AND it is a directory<br />
      // C:\asdf is an existing folder, so go ahead and create C:\asdf\fdsa<br />
    } else {<br />
      // could be a problem - a file 'C:\asdf' is sitting there - NOT a folder<br />
    }  <br />
  } else {<br />
    // C:\asdf missing too, so go ahead and create C:\asdf<br />
    // and then create C:\asdf\fdsa<br />
  }<br />
}<br />

//! Checks whether a directory exists.
//! @param  strDirectory  Directory
//! @return true if the directory exists, false otherwise.
bool dirExists
  (CString strDirectory)
{
  // Create full directory specification - return if unable
  TCHAR* fullPath = _tfullpath (NULL, strDirectory, 0);
  if (fullPath == NULL)
     return (false);
 
  // Check if directory exists by trying to make it the default directory
  TCHAR szCurrDir [_MAX_PATH];
  _tgetcwd (szCurrDir, _MAX_PATH - 1);
  long nStatus = _tchdir (fullPath);
  _tchdir (szCurrDir);
 
  // Return
  free (fullPath);    
  if (nStatus == 0)
     return (true);
  return (false);
}

struct _ptr
{
    double d; // value
    int n;    // original placement in array
} ptr[5] = {{-8, 0},{-9, 1},{5.6, 2},{3.4, 3},{0, 4}};
 
int Compare( const void *p1, const void *p2 )
{
    if (((_ptr *) p1)->d < ((_ptr *) p2)->d)
        return -1;
    else if (((_ptr *) p1)->d > ((_ptr *) p2)->d)
        return 1;
    else
        return 0;
}
 
void main( void )
{
    qsort(ptr, sizeof(ptr) / sizeof(ptr[0]), sizeof(ptr[0]), Compare);
    return;
}

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