C / C++ / MFC

void CRichEditProjDlg::OnSelchangeFontsize() 
{
	DWORD Selection=0, FontSize=0;
	CString SelFontSize;
	Selection = m_FontSize.GetCurSel();              //Get the current Selection

	m_FontSize.GetLBText(Selection, SelFontSize);    //Get the requested Font Size from a drop down box
	FontSize = _ttoi(SelFontSize);

	CHARFORMAT Cfm;
        Cfm.cbSize = sizeof(CHARFORMAT);
	m_RichCatch.GetSelectionCharFormat(Cfm);        //Get the char set of the selection

	Cfm.yHeight = FontSize*20;                      //Calculate the new font size

	m_RichCatch.SetSelectionCharFormat(Cfm);        //Set the new font size
	m_RichCatch.SetFocus();                         //Update the Rich Edit Box
	UpdateData(TRUE);
	
}

void CRichEditProjDlg::OnBold() 
{
	CHARFORMAT Cfm;
	Cfm.cbSize = sizeof(CHARFORMAT);

	m_RichCatch.GetSelectionCharFormat(Cfm);       //Get the char set of selection

	Cfm.dwMask = CFM_BOLD;                         //Apply "boldness"
	Cfm.dwEffects ^= CFE_BOLD; 

	m_RichCatch.SetSelectionCharFormat(Cfm);       //Set the char set
	m_RichCatch.SetFocus();
	
}