Unicode CString to HTML characters

[hershs]

I use tree languages in my MFC application. The application compiled as UNICODE. I need generate html with some text from the controls, and I want create regular html file that contain html characters instead UNICODE, for example the russian letter 'A' will be written as =& # 1040 ; (without spaces)
Something like this (IDC_EDIT_TXT contains Unicode text):

CString str;
CStdioFile fileU(_T("c:\\temp\\unicode.html"),CFile::modeCreate|CFile::modeWrite);
GetDlgItemText(IDC_EDIT_TXT,str);
fileU.WriteString(str);

I tried convert the string with this function:

char szString [1000];
int len = WideCharToMultiByte(CP_UTF8,0,str,-1,szString,sizeof(szString),NULL,NULL);
fileU.Write(szString,len);

but the result was binary unicode string.
Do you know how to convert it do html characters?