MFC utilities

a.cpp

char* ConvertUnicodeToMultybyte(CString strUnicode)
{
	int nLen = WideCharToMultiByte(CP_ACP, 0, strUnicode, -1, NULL, 0, NULL, NULL);

	char* pMultibyte  = new char[nLen];
	memset(pMultibyte, 0x00, (nLen)*sizeof(char));

	WideCharToMultiByte(CP_ACP, 0, strUnicode, -1, pMultibyte, nLen, NULL, NULL);

	return pMultibyte;
}

CString ConvertMultibyteToUnicode(char* pMultibyte)
{
	int nLen = strlen(pMultibyte);

	WCHAR *pWideChar = new WCHAR[nLen];
	memset(pWideChar, 0x00, (nLen)*sizeof(WCHAR));

	MultiByteToWideChar(CP_ACP, 0, (LPCSTR)pMultibyte, -1, pWideChar, nLen);

	CString strUnicode;
	strUnicode.Format(_T("%s"), pWideChar);

	delete [] pWideChar;

	return strUnicode;
}

CString strUnicode(_T("유니코드"));
char* pMultibyte = ConvertUnicodeToMultibyte(strUnicode);

char* pMultibyte = "멀티바이트";
CString strUnicode = ConvertMultibyteToUnicode(pMultibyte);