string str = AnsiString( "строка"  ).c_str();
AnsiString str = string( "строка" ).c_str();


Managed C++  2 . 0 

String^ mngstr = gcnew String( L"строка" );

		public ref class AnsiStrings
		{
		public:
			const char * ConvertStringToLPCTSTR( String^ sString )
			{
				const char * lpsConverted;
				lpsConverted = static_cast<const char *>(const_cast<void*>(static_cast<const
					void*>(System::Runtime::InteropServices::Marshal::StringToHGlobalAnsi(sString))));
				return lpsConverted;
//				return LPCTSTR();
			}
			void ReleaseLPCTSTR(const char * lpsString)
			{
				System::Runtime::InteropServices::Marshal::FreeHGlobal(static_cast<IntPtr>(const_cast<void*>(static_cast<const void*>(lpsString))));
			}
		};

AnsiStrings^ obj = gcnew AnsiStrings;
char *ptrStr = obj->ConvertStringToLPCTSTR( "тест" );
string str =  ptrStr;
obj->ReleaseLPCTSTR( ptrStr  );