how to pass arguments froma program to a mfc based exe

Derive a class from CCommandLineInfo and add your implementation of the virtual member function ParseParam() to process your application specific parameters. The derived class should contain member variables to store your parameters.

Process the command line in InitInstance() of your application using your command line info class:

BOOL CMyApp::InitInstance()
{
//...
    // Parse command line
    CMyCommandLineInfo cmdInfo;
    ParseCommandLine(cmdInfo);
    // Process your command line options here using the member vars
    //  of cmdInfo
//...
    // Optional default handling:
    // Dispatch commands specified on the command line.  Will return FALSE if
    // app was launched with /RegServer, /Register, /Unregserver or /Unregister.
    if (!ProcessShellCommand(cmdInfo))
        return FALSE;
//...
    return TRUE;
}

UPDATE: A very simple CCommandLineInfo derived class.

class CMyCmdLineInfo : public CCommandLineInfo
{
public:
    CMyCmdLineInfo(void);
    virtual void ParseParam(const TCHAR* pszParam, BOOL bFlag, BOOL bLast);
    bool m_bBoolParam;
    bool m_bHelp;
    CString m_strFileParam;
};

CMyCmdLineInfo::CMyCmdLineInfo()
{
    m_bBoolParam = m_bHelpParam = false;
}

void CMyCmdLineInfo::ParseParam(const TCHAR* pszParam, BOOL bFlag, BOOL bLast)
{
    bool bHandled = false;
    TCHAR lpszParse = pszParam;
    if (bFlag)
    {
        switch (*lpszParse)
        {
        case _T('b') :
        case _T('B') : m_bBoolParam = bHandled = true; break;
        case _T('h') :
        case _T('H') :
        case _T('?') : m_bHelp = bHandled = true; break;
        case _T('f') : 
            ++lpszParse;
            if (*lpszParse == _T('='))
                ++lpszParse;
            m_strFileParam = lpszParse;
            bHandled = true;
            break;
        }
    }
    // If the last parameter has no flag, it is treated as the file name to be
    //  opened and the string is stored in the m_strFileName member.
    if (!bHandled)
        CCommandLineInfo::ParseParam(pszParam, bFlag, bLast);
}