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Q: How to process command line arguments in a MFC application?

A:

• Derive a class from CCommandLineInfo, say 'CCustomCommandLineInfo'
  
  class CCustomCommandLineInfo : public CCommandLineInfo
• Add virtual method 'ParseParam()'
  
  {
  virtual void ParseParam(const char* pszParam, BOOL bFlag, BOOL bLast);
  }
• In 'ParseParam()', check the 'pszParam' passed. Note, that 'ParseParam()' will be called as many times as the tokens being used while launching the command line. So, if you call 'Yourapp.exe /e /o /whatever', you will see 3 calls to 'ParseParam()' each with "/e", "/o", "/whatever".
  
  class CCustomCommandLineInfo : public CCommandLineInfo
  {
  CCustomCommandLineInfo()
  {
  m_bExport = m_bOpen = m_bWhatever = FALSE;
  }
  
  //for convenience maintain 3 variables to indicate the param passed.
  BOOL m_bExport; //for /e
  BOOL m_bOpen; //for /o
  BOOL m_bWhatever; //for /whatever
  
  //public methods for checking these.
  public:
  BOOL IsExport() { return m_bExport; };
  BOOL IsOpen() { return m_bOpen; };
  BOOL IsWhatever() { return m_bWhatever; };
  
  virtual void ParseParam(const char* pszParam, BOOL bFlag, BOOL bLast)
  {
  if(0 == strcmp(pszParam, "/o"))
  {
  m_bOpen = TRUE;
  }
  else if(0 == strcmp(pszParam, "/e"))
  {
  m_bExport = TRUE;
  }
  else if(0 == strcmp(pszParam, "/whatever"))
  {
  m_bWhatever = TRUE;
  }
  }
  };
• Instantiate an object of this class in 'InitInstance()' and parse it like below.
  
  BOOL CYourApp::InitInstance()
  {
  // Do all the stuff you want to do, like registering document tempates etc.
  
  CCustomCommandLineInfo oInfo;
  ParseCommandLine(&oInfo);
  // ....
  }

Note: Most of the material in this article is taken from codeguru.com