CString Convert to LPCTSTR 
   CString strResult;
   strResult.Format(“Hi:%d”,5);
   static CString Rxg=_T(strResult);
   LPCTSTR g_DisplayMessage;
   g_DisplayMes=Rxg;

CString to int 

CString String;
String.Format(“%d”, 10);
int Integer = atoi(String);

CString to std::string

CString cs(“Hello”);
std::string s((LPCTSTR)cs);

std::string to CString

std::string strStdString (“Hello!”);
CString strCString (strStdString.c_str ());

 std::string to int

  std::string t_port=”xxx”; 
  int  m_Port=atoi(t_port.c_str());

Convert VARIANT to CString

VARIANT vaData=t_1;
ASSERT(vaData.vt == VT_BSTR);
CString strData(vaData.bstrVal);

BSTR to CString

BSTR t_MSG;
CString szCS;
szCS = (CString)t_MSG;