原文：https://answers.unrealengine.com/questions/160688/access-player-location-from-another-actor.html
FVector PlayerLocation = GetWorld()->GetFirstPlayerController()->GetActorLocation();
这些写会编译错误：
error C2248: 'AController::GetActorLocation' : cannot access private member declared in class 'AController'
正确写法：
You trying to get location of player controller which does not have location, you should get pawn possessed by that controller first which should be player pawn/character (ACharacter is extended version of APawn and APawn is most basic form of character in the game)
- FVectorPlayerLocation=GetWorld()->GetFirstPlayerController()->GetPawn()->GetActorLocation();