cstring 转string

（1）CString转换为string

CString cs(_T("cs"));
string s;
s = (LPCSTR)(CStringA)(cs);

(2)string转换为CString

string s ="Hello World!中国";
CString cs(s.c_str());

（3）string转换为LPWSTR

///string ---to-----LPWSTR

    wstring widstr;

　 std:string s("DanTeng");

    widstr = std::wstring(s.begin(), s.end());

    lvItem.pszText=(LPWSTR)widstr.c_str();