C / C++ / MFC

void CChatDlg::OnSendmsg() 
{
		CString strText;
	GetDlgItemText(IDC_EDIT,strText);
        strText = g_ChatManager.UTF8andURLEncode(strText);
}

CString CChatManager::UTF8andURLEncode(CString sIn)
{
		
	//CString strText = URLEncode(sIn);
	//return EncodeToUTF8(strText);
	
	//added by dhiraj on 19-09-08--------
	return EncodeToUTF8(sIn);
	//code ends here---------------------
}

CString CChatManager::URLEncode(CString sIn)
{
	CString sOut;

	const int nLen = sIn.GetLength();
	// do encoding
	for (int i = 0; i<nLen; i++)
	{
		TCHAR c = sIn.GetAt(i);

		if(iswalnum(c))
			sOut.AppendChar(c);
		else
			if(_istspace(c))
				sOut.AppendChar(_T('+'));
			else
			{
				int ic = _TINT(c);
				sOut.AppendChar(_T('%'));
				sOut.AppendChar(toHex((BYTE)(ic>>4)));
				sOut.AppendChar(toHex((BYTE)(ic%16)));
			}
	}
	sOut.AppendChar(_T('\0'));
	return sOut;
}

CString CChatManager::EncodeToUTF8(LPCTSTR szSource)
{
	WORD ch;

	BYTE bt1, bt2, bt3, bt4, bt5, bt6;

	int n, nMax = _tcslen(szSource);

	CString sFinal, sTemp;

	for (n = 0; n < nMax; ++n)
	{
		ch = (WORD)szSource[n];

		if (ch == _T('='))
		{
			sTemp.Format(_T("%%%02X"), ch);

			sFinal += sTemp;
		}
		/*
		else if (ch == _T('&'))
		{
			sTemp.Format(_T("%26"), ch);

			sFinal += sTemp;

		}
		else if(ch == _T('+'))
		{
			sTemp.Format(_T("%2B"), ch);

			sFinal += sTemp;
		}
		*/
		else if (ch < 128)
		{
			sFinal += szSource[n];
		}
		else if (ch <= 2047)
		{
			bt1 = (BYTE)(192 + (ch / 64));
			bt2 = (BYTE)(128 + (ch % 64));

			sTemp.Format(_T("%%%02X%%%02X"), bt1, bt2);

			sFinal += sTemp;
		}
		else if (ch <= 65535)
		{
			bt1 = (BYTE)(224 + (ch / 4096));
			bt2 = (BYTE)(128 + ((ch / 64) % 64));
			bt3 = (BYTE)(128 + (ch % 64));

			sTemp.Format(_T("%%%02X%%%02X%%%02X"), bt1, bt2, bt3);

			sFinal += sTemp;
		}
		else if (ch <= 2097151)
		{
			bt1 = (BYTE)(240 + (ch / 262144));
			bt2 = (BYTE)(128 + ((ch / 4096) % 64));
			bt3 = (BYTE)(128 + ((ch / 64) % 64));
			bt4 = (BYTE)(128 + (ch % 64));

			sTemp.Format(_T("%%%02X%%%02X%%%02X%%%02X"), bt1, bt2, bt3, bt4);
			sFinal += sTemp;
		}
		else if (ch <=67108863)
		{
			bt1 = (BYTE)(248 + (ch / 16777216));
			bt2 = (BYTE)(128 + ((ch / 262144) % 64));
			bt3 = (BYTE)(128 + ((ch / 4096) % 64));
			bt4 = (BYTE)(128 + ((ch / 64) % 64));
			bt5 = (BYTE)(128 + (ch % 64));

			sTemp.Format(_T("%%%02X%%%02X%%%02X%%%02X%%%02X"), bt1, bt2, bt3, bt4, bt5);
			sFinal += sTemp;
		}
		else if (ch <=2147483647)
		{
			bt1 = (BYTE)(252 + (ch / 1073741824));
			bt2 = (BYTE)(128 + ((ch / 16777216) % 64));
			bt3 = (BYTE)(128 + ((ch / 262144) % 64));
			bt4 = (BYTE)(128 + ((ch / 4096) % 64));
			bt5 = (BYTE)(128 + ((ch / 64) % 64));
			bt6 = (BYTE)(128 + (ch % 64));

			sTemp.Format(_T("%%%02X%%%02X%%%02X%%%02X%%%02X%%%02X"), 
				bt1, bt2, bt3, bt4, bt5, bt6);
			sFinal += sTemp;
		}

	}

	return sFinal;
}

class ClassOfImplementationNamespace
{
     void itsFunc(int x)
     {
          // let the compiler alone decide 
          // whether to inline this code, 
          // it will know better
     }
};