Thank you, gentleman. I know how he works, and I also try to search cltclient:: sendtoserver in IDA. But I'm not sure I found the right address. Should I proceed from the address indicated by the red arrow? Maybe this is a silly question. (because my server has very strong anti cheating protection, once I inject DLL, the game will crash. I can't test it, but I still want to continue to learn some basics.) IMG:
https://prnt.sc/uucnj7