go语言编程书上有一些代码有误和遗漏的地方,这里就行了修改与加如了一小段代码。
---开始,我也搜个百度,大多都是一样的,而且在remove代码块还是有些问题(不能是传name)。
好吧！！不多说了.下面展示所有的代码。
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先贴入口文件.
mplayer.go
packagemain
import(
"bufio"
"fmt"
"os"
"strconv"
"strings"
"mplayer/library"//这里是目录结构哦,别放做了,src下的mplayer目录下的library目录
"mplayer/mp"//src下的mplayer目录下的mp目录
)
funchandleLibCommands(tokens[]string){
iflen(tokens)<2{
fmt.Println(`
Enterfollowingcommandstocontroltheplayer:
liblist--Viewtheexistingmusiclib
libadd<name><artist><source><type>--Addamusictothemusiclib
libremove序号--Removethespecifiedmusicfromthelib
`)
return
}
switchtokens[1]{
case"list":
fmt.Println("序号MP3_id名字作者路径类型")
fori:=0;i<lib.Len();i++{
e,_:=lib.Get(i)
fmt.Printf("%-4d%-8s%-10s%-12s%-20s%-5s\n",i+1,e.Id,e.Name,e.Artist,e.Source,e.Type)
//fmt.Println("",":","",e.Type)
}
case"add":
{
iflen(tokens)==6{
id++
lib.Add(&library.MusicEntry{strconv.Itoa(id),tokens[2],tokens[3],tokens[4],tokens[5]})
}else{
fmt.Println("USAGE:libadd<name><artist><source><type>")
}
}
case"remove":
iflen(tokens)==3{
index,_:=strconv.Atoi(tokens[2])
//fmt.Println(index)
lib.Remove(index)
fmt.Println("序号MP3_id名字作者路径类型")
fori:=0;i<lib.Len();i++{
e,_:=lib.Get(i)
fmt.Printf("%-4d%-8s%-10s%-12s%-20s%-5s\n",e.Type)
}
}else{
fmt.Println("USAGE:libremove<id>")
}
default:
fmt.Println("Unrecognizedlibcommand:",tokens[1])
}
}
funchandlePlayCommand(tokens[]string){
iflen(tokens)!=2{
fmt.Println("USAGE:play<name>")
return
}
e:=lib.Find(tokens[1])
ife==nil{
fmt.Println("Themusic",tokens[1],"doesnotexist.")
return
}
mp.Play(e.Source,e.Type)
}
varlib*library.MusicManager
varidint=0
funcmain(){
lib=library.NewMusicManager()
fmt.Println(`
Enterfollowingcommandstocontroltheplayer:
liblist--Viewtheexistingmusiclib
libadd<name><artist><source><type>--Addamusictothemusiclib
libremove<序号>--Removethespecifiedmusicfromthelib
play<name>--Playthespecifiedmusic
q|e--quit|exit
`)
r:=bufio.NewReader(os.Stdin)
for{
fmt.Print("Entercommand->")
rawLine,_,_:=r.ReadLine()
line:=string(rawLine)
ifline=="q"||line=="e"{
break
}
tokens:=strings.Split(line,"")
iftokens[0]=="lib"{
handleLibCommands(tokens)
}elseiftokens[0]=="play"{
handlePlayCommand(tokens)
}else{
fmt.Println("Unrecognizedcommand:",tokens[0])
}
}
}
manager.go //在mplayer目录下的library目录下
packagelibrary
import(
"errors"
"fmt"
)
typeMusicEntrystruct{
Idstring
Namestring
Artiststring
Sourcestring
Typestring
}
typeMusicManagerstruct{
musics[]MusicEntry
}
funcNewMusicManager()*MusicManager{
return&MusicManager{make([]MusicEntry,0)}
}
func(m*MusicManager)Len()int{
returnlen(m.musics)
}
func(m*MusicManager)Get(indexint)(music*MusicEntry,errerror){
ifindex<0||index>=len(m.musics){
returnnil,errors.New("Indexoutofrange.")
}
//fmt.Println(m)
return&m.musics[index],nil
}
func(m*MusicManager)Find(namestring)*MusicEntry{
iflen(m.musics)==0{
returnnil
}
for_,m:=rangem.musics{
ifm.Name==name{
return&m
}
}
returnnil
}
func(m*MusicManager)Add(music*MusicEntry){
m.musics=append(m.musics,*music)
}
func(m*MusicManager)Remove(indexint)*MusicEntry{
ifindex<0||index>len(m.musics){
fmt.Println("请重新选择删除的序号..")
returnnil
}
removedMusic:=&m.musics[index-1]
//从数组切片中删除元素
ifindex<len(m.musics){//中间元素
m.musics=append(m.musics[:index-1],m.musics[index:]...)
}else{//删除的是最后一个元素
//fmt.Println("删除最后一个")
m.musics=m.musics[:index-1]
}
returnremovedMusic
}
mp3.go //mplayer 目录下的mp目录
packagemp
import(
"fmt"
"time"
)
typeMP3Playerstruct{
statint
progressint
}
typeWAVPlayerstruct{
statint
progressint
}
func(p*MP3Player)Play(sourcestring){
fmt.Println("PlayingMP3music",source)
p.progress=0
forp.progress<100{
time.Sleep(100*time.Millisecond)//假装正在播放
fmt.Print(".")
p.progress+=10
}
fmt.Println("\nFinishedplaying",source)
}
func(p*WAVPlayer)Play(sourcestring){
fmt.Println("PlayingWAVmusic",source)
}
play.go //mplayer目录下的mp目录下
packagemp
import"fmt"
typePlayerinterface{
Play(sourcestring)
}
funcPlay(source,mtypestring){
varpPlayer
switchmtype{
case"MP3":
p=&MP3Player{}
case"WAV":
p=&WAVPlayer{}
default:
fmt.Println("Unsupportedmusictype",mtype)
return
}
p.Play(source)
}
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如上面有所遗漏或代码有误,请留言。欢迎勘误指正。
