我正在为 Unity 引擎开发多人游戏 API。我有 Room 和 RoomManager 结构。当我想创建房间时,我设置房间名称、id(所有变量),然后我将这个新房间附加到 RoomManager 结构中的 allRoom 数组。之后,当我修改为 room 变量时,我无法更改任何变量。我不知道为什么?
这是我的结构和方法:
房间管理器结构
type RoomManager struct {
allRooms []Room
roomCounter int
}
房间结构
type Room struct {
tag string
name string
password string
id int
cappacity int
maxVariableCount int
userList []User
roomVariables []RoomVariable
extensionHandlers []ExtensionRequest
InitializeMethod roomInitializeFunc
}
房间创建方法
func (roomManager *RoomManager) CreateRoom(settings RoomSettings, arwServer *ARWServer) *Room {
var newRoom Room
newRoom.InitializeMethod = settings.InitializeMethod
newRoom.name = settings.name
newRoom.password = settings.password
newRoom.tag = settings.tag
newRoom.cappacity = settings.cappacity
newRoom.maxVariableCount = settings.maxRoomVariableCount
newRoom.id = roomManager.roomCounter
roomManager.roomCounter++
newRoom.userList = make([]User, 0, newRoom.cappacity)
newRoom.roomVariables = make([]RoomVariable, 0, newRoom.maxVariableCount)
if newRoom.InitializeMethod != nil {
newRoom.InitializeMethod(arwServer, &newRoom)
}
roomManager.allRooms = append(roomManager.allRooms, newRoom)
return &newRoom
}
将用户添加到房间
func (room *Room) AddUserToRoom(arwServer *ARWServer, u User) {
room.userList = append(room.userList, u)
var arwObj ARWObject
arwObj.requestName = Join_Room
arwObj.eventParams.PutString("RoomName", room.name)
arwObj.eventParams.PutString("RoomTag", room.tag)
arwObj.eventParams.PutInt("RoomId", room.id)
arwObj.eventParams.PutInt("RoomCappacity", room.cappacity)
usersData := ""
for ii := 0; ii < len(room.userList); ii++ {
if room.userList[ii].name != u.name {
usersData += room.userList[ii].GetDataForOtherUser(u) + "''"
}
}
usersData = strings.TrimRight(usersData, "''")
arwObj.eventParams.PutString("Users", usersData)
arwServer.SendRequestToUser(u, arwObj)
var arwObjforTheOthers ARWObject
arwObjforTheOthers.requestName = User_Enter_Room
arwObjforTheOthers.eventParams.PutString("RoomName", room.name)
arwObjforTheOthers.eventParams.PutString("userName", u.name)
arwObjforTheOthers.eventParams.PutInt("userId", u.id)
arwObjforTheOthers.eventParams.PutString("isMe", "false")
room.SendRequestAllUserWithoutMe(*arwServer, arwObjforTheOthers, u)
fmt.Println("User join Room - User Name : ", u.name+" Room : "+u.lastRoom.name)
}
最佳答案
您的问题是您的结构具有非指针 slice 。在你所有的结构中,将你的 slice 定义为像这样的指针 slice
Rooms []*Room
你还需要定义你的函数来获取指针值,就像这样
func(room *Room) {}
详细说明。 Go 是按值传递的。任何时候你从你的一个原始 slice 中提取一些东西并将它传递给你的一个函数,它都会得到一个副本。使用指针修改 slice 中的实际值。
请参阅此示例。 https://play.golang.org/p/ZThHrP0pds
package main
import (
"fmt"
)
type Thing struct {
Name string
}
func main() {
things := []Thing{}
thing := Thing{"thing1"}
// add to slice
// note that this is a function call
things = append(things, thing)
// attempt to change
thing.Name = "thing2"
fmt.Println(things[0].Name) // prints thing1
fmt.Println(thing.Name) // prints thing2
fmt.Println("------")
// try again
thing3 := things[0]
thing3.Name = "thing3"
// fail again
fmt.Println(things[0].Name) // prints thing1
fmt.Println(thing3.Name) // prints thing3
fmt.Println("------")
// do this instead
betterThings := []*Thing{} // slice of pointers
betterThing := &Thing{"thing2"} // betterThing is of type *Thing
// add to slice
betterThings = append(betterThings, betterThing)
// successfully change
betterThing.Name = "thing2"
fmt.Println(betterThings[0].Name) // prints thing2
fmt.Println(betterThing.Name) // prints thing2
}
关于arrays - 附加到数组后我无法修改该项目,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43922965/