va_list

va_list
: Type to hold information about variable arguments

va_start
: Initialize a variable argument list

void test::dbg(LPCTSTR lpFmt,... )
{
va_list marker;
va_start( marker,lpFmt );
char text[1000]={0,};

vsprintf( text,lpFmt,marker);
va_end( marker );

CString ret(text);
//...

}