How to output data in multi ways

For example I want to output data to text file and Window-GUI(wpf):

1. open config.ini
2. find OutputMethods
3. set value "wpf,text" ( e.g. OutputMethods=wpf,text ,split by char ',')

Now there are methods which output support:

• text
• wpf
• ingame
• mmf (MemoryMapFile for obs-plugin using,Details)