For more details see the TString Reference.
Get substring of existing string
TString new = old(start, subStrLength); // start is the index of the first character // subStrLength is the number of characters to copy // e.g: remove S charachters form start and E from end TString new = old(S, old.Length()-S-E);
Combine some variables with a static Text
TString string = Form("My Number is %d", number);
If your variable is a TString, you need to pass the underlying char array
TString string = Form("My TString is %s", tstring.Data() );
The function follows printf-syntax