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< div class = "book" data-level = "10.5" data-chapter-title = "匿名導入" data-filepath = "ch10/ch10-05.md" data-basepath = ".." data-revision = "Thu Dec 31 2015 16:18:40 GMT+0800 (中国标准时间)" >
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前言
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< b > 0.1.< / b >
Go語言起源
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< b > 0.2.< / b >
Go語言項目
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< b > 0.3.< / b >
本書的組織
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< b > 0.4.< / b >
更多的信息
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< b > 0.5.< / b >
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致謝
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< b > 1.< / b >
入門
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< b > 1.1.< / b >
Hello, World
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< b > 1.2.< / b >
命令行參數
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< b > 1.3.< / b >
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査找重複的行
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< b > 1.4.< / b >
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GIF動畵
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< b > 1.5.< / b >
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獲取URL
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< b > 1.6.< / b >
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併發獲取多個URL
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< b > 1.7.< / b >
Web服務
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< b > 1.8.< / b >
本章要點
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< b > 2.< / b >
程序結構
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< b > 2.1.< / b >
命名
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< b > 2.2.< / b >
聲明
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< b > 2.3.< / b >
變量
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< b > 2.4.< / b >
賦值
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< b > 2.5.< / b >
類型
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< b > 2.6.< / b >
包和文件
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< b > 2.7.< / b >
作用域
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< b > 3.< / b >
基礎數據類型
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< b > 3.1.< / b >
整型
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< b > 3.2.< / b >
浮點數
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< a href = "../ch3/ch3-03.html" >
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< b > 3.3.< / b >
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複數
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< b > 3.4.< / b >
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布爾型
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< li class = "chapter " data-level = "3.5" data-path = "ch3/ch3-05.html" >
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< b > 3.5.< / b >
字符串
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< b > 3.6.< / b >
常量
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< b > 4.< / b >
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複合數據類型
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< ul class = "articles" >
< li class = "chapter " data-level = "4.1" data-path = "ch4/ch4-01.html" >
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< b > 4.1.< / b >
數組
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< b > 4.2.< / b >
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Slice
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< li class = "chapter " data-level = "4.3" data-path = "ch4/ch4-03.html" >
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< b > 4.3.< / b >
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Map
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< li class = "chapter " data-level = "4.4" data-path = "ch4/ch4-04.html" >
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< b > 4.4.< / b >
結構體
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< b > 4.5.< / b >
JSON
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< b > 4.6.< / b >
文本和HTML模闆
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< li class = "chapter " data-level = "5" data-path = "ch5/ch5.html" >
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< b > 5.< / b >
函數
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< b > 5.1.< / b >
函數聲明
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< b > 5.2.< / b >
遞歸
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< li class = "chapter " data-level = "5.3" data-path = "ch5/ch5-03.html" >
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< b > 5.3.< / b >
多返迴值
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< li class = "chapter " data-level = "5.4" data-path = "ch5/ch5-04.html" >
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< b > 5.4.< / b >
錯誤
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< b > 5.5.< / b >
函數值
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< b > 5.6.< / b >
匿名函數
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< li class = "chapter " data-level = "5.7" data-path = "ch5/ch5-07.html" >
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< b > 5.7.< / b >
可變參數
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< li class = "chapter " data-level = "5.8" data-path = "ch5/ch5-08.html" >
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< b > 5.8.< / b >
Deferred函數
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< li class = "chapter " data-level = "5.9" data-path = "ch5/ch5-09.html" >
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< b > 5.9.< / b >
Panic異常
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< li class = "chapter " data-level = "5.10" data-path = "ch5/ch5-10.html" >
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< b > 5.10.< / b >
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Recover捕獲異常
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< b > 6.< / b >
方法
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< b > 6.1.< / b >
方法聲明
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< b > 6.2.< / b >
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基於指針對象的方法
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< li class = "chapter " data-level = "6.3" data-path = "ch6/ch6-03.html" >
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< b > 6.3.< / b >
通過嵌入結構體來擴展類型
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< li class = "chapter " data-level = "6.4" data-path = "ch6/ch6-04.html" >
< a href = "../ch6/ch6-04.html" >
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< b > 6.4.< / b >
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方法值和方法表達式
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< b > 6.5.< / b >
示例: Bit數組
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< b > 6.6.< / b >
封裝
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< b > 7.< / b >
接口
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< b > 7.1.< / b >
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接口是合約
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< li class = "chapter " data-level = "7.2" data-path = "ch7/ch7-02.html" >
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< b > 7.2.< / b >
接口類型
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< li class = "chapter " data-level = "7.3" data-path = "ch7/ch7-03.html" >
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< b > 7.3.< / b >
實現接口的條件
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< b > 7.4.< / b >
flag.Value接口
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< b > 7.5.< / b >
接口值
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< b > 7.6.< / b >
sort.Interface接口
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< b > 7.7.< / b >
http.Handler接口
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< b > 7.8.< / b >
error接口
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< b > 7.9.< / b >
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示例: 表達式求值
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< b > 7.10.< / b >
類型斷言
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< b > 7.11.< / b >
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基於類型斷言識别錯誤類型
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< b > 7.12.< / b >
通過類型斷言査詢接口
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< / li >
< li class = "chapter " data-level = "7.13" data-path = "ch7/ch7-13.html" >
< a href = "../ch7/ch7-13.html" >
< i class = "fa fa-check" > < / i >
< b > 7.13.< / b >
類型分支
< / a >
< / li >
< li class = "chapter " data-level = "7.14" data-path = "ch7/ch7-14.html" >
< a href = "../ch7/ch7-14.html" >
< i class = "fa fa-check" > < / i >
< b > 7.14.< / b >
示例: 基於標記的XML解碼
< / a >
< / li >
< li class = "chapter " data-level = "7.15" data-path = "ch7/ch7-15.html" >
< a href = "../ch7/ch7-15.html" >
< i class = "fa fa-check" > < / i >
< b > 7.15.< / b >
補充幾點
< / a >
< / li >
< / ul >
< / li >
< li class = "chapter " data-level = "8" data-path = "ch8/ch8.html" >
< a href = "../ch8/ch8.html" >
< i class = "fa fa-check" > < / i >
< b > 8.< / b >
Goroutines和Channels
< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "8.1" data-path = "ch8/ch8-01.html" >
< a href = "../ch8/ch8-01.html" >
< i class = "fa fa-check" > < / i >
< b > 8.1.< / b >
Goroutines
< / a >
< / li >
< li class = "chapter " data-level = "8.2" data-path = "ch8/ch8-02.html" >
< a href = "../ch8/ch8-02.html" >
< i class = "fa fa-check" > < / i >
< b > 8.2.< / b >
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示例: 併發的Clock服務
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< / a >
< / li >
< li class = "chapter " data-level = "8.3" data-path = "ch8/ch8-03.html" >
< a href = "../ch8/ch8-03.html" >
< i class = "fa fa-check" > < / i >
< b > 8.3.< / b >
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示例: 併發的Echo服務
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< / a >
< / li >
< li class = "chapter " data-level = "8.4" data-path = "ch8/ch8-04.html" >
< a href = "../ch8/ch8-04.html" >
< i class = "fa fa-check" > < / i >
< b > 8.4.< / b >
Channels
< / a >
< / li >
< li class = "chapter " data-level = "8.5" data-path = "ch8/ch8-05.html" >
< a href = "../ch8/ch8-05.html" >
< i class = "fa fa-check" > < / i >
< b > 8.5.< / b >
併行的循環
< / a >
< / li >
< li class = "chapter " data-level = "8.6" data-path = "ch8/ch8-06.html" >
< a href = "../ch8/ch8-06.html" >
< i class = "fa fa-check" > < / i >
< b > 8.6.< / b >
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示例: 併發的Web爬蟲
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< / a >
< / li >
< li class = "chapter " data-level = "8.7" data-path = "ch8/ch8-07.html" >
< a href = "../ch8/ch8-07.html" >
< i class = "fa fa-check" > < / i >
< b > 8.7.< / b >
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基於select的多路複用
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< / a >
< / li >
< li class = "chapter " data-level = "8.8" data-path = "ch8/ch8-08.html" >
< a href = "../ch8/ch8-08.html" >
< i class = "fa fa-check" > < / i >
< b > 8.8.< / b >
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示例: 併發的字典遍歷
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< / a >
< / li >
< li class = "chapter " data-level = "8.9" data-path = "ch8/ch8-09.html" >
< a href = "../ch8/ch8-09.html" >
< i class = "fa fa-check" > < / i >
< b > 8.9.< / b >
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併發的退出
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< / a >
< / li >
< li class = "chapter " data-level = "8.10" data-path = "ch8/ch8-10.html" >
< a href = "../ch8/ch8-10.html" >
< i class = "fa fa-check" > < / i >
< b > 8.10.< / b >
示例: 聊天服務
< / a >
< / li >
< / ul >
< / li >
< li class = "chapter " data-level = "9" data-path = "ch9/ch9.html" >
< a href = "../ch9/ch9.html" >
< i class = "fa fa-check" > < / i >
< b > 9.< / b >
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基於共享變量的併發
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< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "9.1" data-path = "ch9/ch9-01.html" >
< a href = "../ch9/ch9-01.html" >
< i class = "fa fa-check" > < / i >
< b > 9.1.< / b >
競爭條件
< / a >
< / li >
< li class = "chapter " data-level = "9.2" data-path = "ch9/ch9-02.html" >
< a href = "../ch9/ch9-02.html" >
< i class = "fa fa-check" > < / i >
< b > 9.2.< / b >
sync.Mutex互斥鎖
< / a >
< / li >
< li class = "chapter " data-level = "9.3" data-path = "ch9/ch9-03.html" >
< a href = "../ch9/ch9-03.html" >
< i class = "fa fa-check" > < / i >
< b > 9.3.< / b >
sync.RWMutex讀寫鎖
< / a >
< / li >
< li class = "chapter " data-level = "9.4" data-path = "ch9/ch9-04.html" >
< a href = "../ch9/ch9-04.html" >
< i class = "fa fa-check" > < / i >
< b > 9.4.< / b >
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內存同步
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< / a >
< / li >
< li class = "chapter " data-level = "9.5" data-path = "ch9/ch9-05.html" >
< a href = "../ch9/ch9-05.html" >
< i class = "fa fa-check" > < / i >
< b > 9.5.< / b >
sync.Once初始化
< / a >
< / li >
< li class = "chapter " data-level = "9.6" data-path = "ch9/ch9-06.html" >
< a href = "../ch9/ch9-06.html" >
< i class = "fa fa-check" > < / i >
< b > 9.6.< / b >
競爭條件檢測
< / a >
< / li >
< li class = "chapter " data-level = "9.7" data-path = "ch9/ch9-07.html" >
< a href = "../ch9/ch9-07.html" >
< i class = "fa fa-check" > < / i >
< b > 9.7.< / b >
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示例: 併發的非阻塞緩存
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< / a >
< / li >
< li class = "chapter " data-level = "9.8" data-path = "ch9/ch9-08.html" >
< a href = "../ch9/ch9-08.html" >
< i class = "fa fa-check" > < / i >
< b > 9.8.< / b >
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Goroutines和線程
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< / a >
< / li >
< / ul >
< / li >
< li class = "chapter " data-level = "10" data-path = "ch10/ch10.html" >
< a href = "../ch10/ch10.html" >
< i class = "fa fa-check" > < / i >
< b > 10.< / b >
包和工具
< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "10.1" data-path = "ch10/ch10-01.html" >
< a href = "../ch10/ch10-01.html" >
< i class = "fa fa-check" > < / i >
< b > 10.1.< / b >
簡介
< / a >
< / li >
< li class = "chapter " data-level = "10.2" data-path = "ch10/ch10-02.html" >
< a href = "../ch10/ch10-02.html" >
< i class = "fa fa-check" > < / i >
< b > 10.2.< / b >
導入路徑
< / a >
< / li >
< li class = "chapter " data-level = "10.3" data-path = "ch10/ch10-03.html" >
< a href = "../ch10/ch10-03.html" >
< i class = "fa fa-check" > < / i >
< b > 10.3.< / b >
包聲明
< / a >
< / li >
< li class = "chapter " data-level = "10.4" data-path = "ch10/ch10-04.html" >
< a href = "../ch10/ch10-04.html" >
< i class = "fa fa-check" > < / i >
< b > 10.4.< / b >
導入聲明
< / a >
< / li >
< li class = "chapter active" data-level = "10.5" data-path = "ch10/ch10-05.html" >
< a href = "../ch10/ch10-05.html" >
< i class = "fa fa-check" > < / i >
< b > 10.5.< / b >
匿名導入
< / a >
< / li >
< li class = "chapter " data-level = "10.6" data-path = "ch10/ch10-06.html" >
< a href = "../ch10/ch10-06.html" >
< i class = "fa fa-check" > < / i >
< b > 10.6.< / b >
包和命名
< / a >
< / li >
< li class = "chapter " data-level = "10.7" data-path = "ch10/ch10-07.html" >
< a href = "../ch10/ch10-07.html" >
< i class = "fa fa-check" > < / i >
< b > 10.7.< / b >
工具
< / a >
< / li >
< / ul >
< / li >
< li class = "chapter " data-level = "11" data-path = "ch11/ch11.html" >
< a href = "../ch11/ch11.html" >
< i class = "fa fa-check" > < / i >
< b > 11.< / b >
測試
< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "11.1" data-path = "ch11/ch11-01.html" >
< a href = "../ch11/ch11-01.html" >
< i class = "fa fa-check" > < / i >
< b > 11.1.< / b >
go test
< / a >
< / li >
< li class = "chapter " data-level = "11.2" data-path = "ch11/ch11-02.html" >
< a href = "../ch11/ch11-02.html" >
< i class = "fa fa-check" > < / i >
< b > 11.2.< / b >
測試函數
< / a >
< / li >
< li class = "chapter " data-level = "11.3" data-path = "ch11/ch11-03.html" >
< a href = "../ch11/ch11-03.html" >
< i class = "fa fa-check" > < / i >
< b > 11.3.< / b >
測試覆蓋率
< / a >
< / li >
< li class = "chapter " data-level = "11.4" data-path = "ch11/ch11-04.html" >
< a href = "../ch11/ch11-04.html" >
< i class = "fa fa-check" > < / i >
< b > 11.4.< / b >
基準測試
< / a >
< / li >
< li class = "chapter " data-level = "11.5" data-path = "ch11/ch11-05.html" >
< a href = "../ch11/ch11-05.html" >
< i class = "fa fa-check" > < / i >
< b > 11.5.< / b >
剖析
< / a >
< / li >
< li class = "chapter " data-level = "11.6" data-path = "ch11/ch11-06.html" >
< a href = "../ch11/ch11-06.html" >
< i class = "fa fa-check" > < / i >
< b > 11.6.< / b >
示例函數
< / a >
< / li >
< / ul >
< / li >
< li class = "chapter " data-level = "12" data-path = "ch12/ch12.html" >
< a href = "../ch12/ch12.html" >
< i class = "fa fa-check" > < / i >
< b > 12.< / b >
反射
< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "12.1" data-path = "ch12/ch12-01.html" >
< a href = "../ch12/ch12-01.html" >
< i class = "fa fa-check" > < / i >
< b > 12.1.< / b >
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爲何需要反射?
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< / a >
< / li >
< li class = "chapter " data-level = "12.2" data-path = "ch12/ch12-02.html" >
< a href = "../ch12/ch12-02.html" >
< i class = "fa fa-check" > < / i >
< b > 12.2.< / b >
reflect.Type和reflect.Value
< / a >
< / li >
< li class = "chapter " data-level = "12.3" data-path = "ch12/ch12-03.html" >
< a href = "../ch12/ch12-03.html" >
< i class = "fa fa-check" > < / i >
< b > 12.3.< / b >
Display遞歸打印
< / a >
< / li >
< li class = "chapter " data-level = "12.4" data-path = "ch12/ch12-04.html" >
< a href = "../ch12/ch12-04.html" >
< i class = "fa fa-check" > < / i >
< b > 12.4.< / b >
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示例: 編碼S表達式
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< / a >
< / li >
< li class = "chapter " data-level = "12.5" data-path = "ch12/ch12-05.html" >
< a href = "../ch12/ch12-05.html" >
< i class = "fa fa-check" > < / i >
< b > 12.5.< / b >
通過reflect.Value脩改值
< / a >
< / li >
< li class = "chapter " data-level = "12.6" data-path = "ch12/ch12-06.html" >
< a href = "../ch12/ch12-06.html" >
< i class = "fa fa-check" > < / i >
< b > 12.6.< / b >
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示例: 解碼S表達式
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< / a >
< / li >
< li class = "chapter " data-level = "12.7" data-path = "ch12/ch12-07.html" >
< a href = "../ch12/ch12-07.html" >
< i class = "fa fa-check" > < / i >
< b > 12.7.< / b >
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獲取結構體字段標識
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< / a >
< / li >
< li class = "chapter " data-level = "12.8" data-path = "ch12/ch12-08.html" >
< a href = "../ch12/ch12-08.html" >
< i class = "fa fa-check" > < / i >
< b > 12.8.< / b >
顯示一個類型的方法集
< / a >
< / li >
< li class = "chapter " data-level = "12.9" data-path = "ch12/ch12-09.html" >
< a href = "../ch12/ch12-09.html" >
< i class = "fa fa-check" > < / i >
< b > 12.9.< / b >
幾點忠告
< / a >
< / li >
< / ul >
< / li >
< li class = "chapter " data-level = "13" data-path = "ch13/ch13.html" >
< a href = "../ch13/ch13.html" >
< i class = "fa fa-check" > < / i >
< b > 13.< / b >
底層編程
< / a >
< ul class = "articles" >
< li class = "chapter " data-level = "13.1" data-path = "ch13/ch13-01.html" >
< a href = "../ch13/ch13-01.html" >
< i class = "fa fa-check" > < / i >
< b > 13.1.< / b >
unsafe.Sizeof, Alignof 和 Offsetof
< / a >
< / li >
< li class = "chapter " data-level = "13.2" data-path = "ch13/ch13-02.html" >
< a href = "../ch13/ch13-02.html" >
< i class = "fa fa-check" > < / i >
< b > 13.2.< / b >
unsafe.Pointer
< / a >
< / li >
< li class = "chapter " data-level = "13.3" data-path = "ch13/ch13-03.html" >
< a href = "../ch13/ch13-03.html" >
< i class = "fa fa-check" > < / i >
< b > 13.3.< / b >
示例: 深度相等判斷
< / a >
< / li >
< li class = "chapter " data-level = "13.4" data-path = "ch13/ch13-04.html" >
< a href = "../ch13/ch13-04.html" >
< i class = "fa fa-check" > < / i >
< b > 13.4.< / b >
通過cgo調用C代碼
< / a >
< / li >
< li class = "chapter " data-level = "13.5" data-path = "ch13/ch13-05.html" >
< a href = "../ch13/ch13-05.html" >
< i class = "fa fa-check" > < / i >
< b > 13.5.< / b >
幾點忠告
< / a >
< / li >
< / ul >
< / li >
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< li class = "chapter " data-level = "14" data-path = "CONTRIBUTORS.html" >
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2015-12-24 06:47:06 +00:00
< a href = "../CONTRIBUTORS.html" >
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< i class = "fa fa-check" > < / i >
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< b > 14.< / b >
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附録
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< / a >
< / li >
< li class = "divider" > < / li >
< li >
< a href = "https://www.gitbook.com" target = "blank" class = "gitbook-link" >
本書使用 GitBook 釋出
< / a >
< / li >
< / ul >
< / nav >
< / div >
< div class = "book-body" >
< div class = "body-inner" >
< div class = "book-header" role = "navigation" >
<!-- Actions Left -->
<!-- Title -->
< h1 >
< i class = "fa fa-circle-o-notch fa-spin" > < / i >
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< a href = "../" > Go语言圣经< / a >
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< / h1 >
< / div >
< div class = "page-wrapper" tabindex = "-1" role = "main" >
< div class = "page-inner" >
< section class = "normal" id = "section-" >
< h2 id = "105-匿名導入" > 10.5. 匿 名 導 入 < / h2 >
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< p > 如 果 隻 是 導 入 一 個 包 而 併 不 使 用 導 入 的 包 是 一 個 編 譯 錯 誤 . 但 是 有 時 候 我 們 隻 是 想 利 用 導 入 包 産 生 的 副 作 用 : 它 會 計 算 包 級 變 量 的 初 始 化 表 達 式 和 執 行 導 入 包 的 init 初 始 化 函 數 (§ 2.6.2). 這 時 候 我 們 需 要 抑 製 “ 未 使 用 的 導 入 ” 錯 誤 是 合 理 的 , 我 們 可 以 用 下 劃 線 < code > _< / code > 來 重 命 名 導 入 的 包 . 像 往 常 一 樣 , 下 劃 線 < code > _< / code > 爲 空 白 標 識 符 , 併 不 能 被 訪 問 .< / p >
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< pre > < code class = "lang-Go" > < span class = "hljs-keyword" > import< / span > _ < span class = "hljs-string" > " image/png" < / span > < span class = "hljs-comment" > // register PNG decoder< / span >
< / code > < / pre >
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< p > 這 個 被 稱 爲 匿 名 導 入 . 它 通 常 是 用 來 實 現 一 個 編 譯 時 機 製 , 然 後 通 過 在 main主 程 序 入 口 選 擇 性 地 導 入 附 加 的 包 . 首 先 , 讓 我 們 看 看 如 何 使 用 它 , 然 後 再 看 看 它 是 如 何 工 作 的 :< / p >
< p > 標 準 庫 的 image 圖 像 包 導 入 了 一 個 < code > Decode< / code > 函 數 , 用 於 從 < code > io.Reader< / code > 接 口 讀 取 數 據 併 解 碼 圖 像 , 它 調 用 底 層 註 冊 的 圖 像 解 碼 器 工 作 , 然 後 返 迴 image.Image 類 型 的 圖 像 . 使 用 < code > image.Decode< / code > 很 容 易 編 寫 一 個 圖 像 格 式 的 轉 換 工 具 , 讀 取 一 種 格 式 的 圖 像 , 然 後 編 碼 爲 另 一 種 圖 像 格 式 :< / p >
2015-12-09 07:57:17 +00:00
< pre > < code class = "lang-Go" > gopl.io/ch10/jpeg
< span class = "hljs-comment" > // The jpeg command reads a PNG image from the standard input< / span >
< span class = "hljs-comment" > // and writes it as a JPEG image to the standard output.< / span >
< span class = "hljs-keyword" > package< / span > main
< span class = "hljs-keyword" > import< / span > (
< span class = "hljs-string" > " fmt" < / span >
< span class = "hljs-string" > " image" < / span >
< span class = "hljs-string" > " image/jpeg" < / span >
_ < span class = "hljs-string" > " image/png" < / span > < span class = "hljs-comment" > // register PNG decoder< / span >
< span class = "hljs-string" > " io" < / span >
< span class = "hljs-string" > " os" < / span >
)
< span class = "hljs-keyword" > func< / span > main() {
< span class = "hljs-keyword" > if< / span > err := toJPEG(os.Stdin, os.Stdout); err != < span class = "hljs-constant" > nil< / span > {
fmt.Fprintf(os.Stderr, < span class = "hljs-string" > " jpeg: %v\n" < / span > , err)
os.Exit(< span class = "hljs-number" > 1< / span > )
}
}
< span class = "hljs-keyword" > func< / span > toJPEG(in io.Reader, out io.Writer) error {
img, kind, err := image.Decode(in)
< span class = "hljs-keyword" > if< / span > err != < span class = "hljs-constant" > nil< / span > {
< span class = "hljs-keyword" > return< / span > err
}
fmt.Fprintln(os.Stderr, < span class = "hljs-string" > " Input format =" < / span > , kind)
< span class = "hljs-keyword" > return< / span > jpeg.Encode(out, img, & jpeg.Options{Quality: < span class = "hljs-number" > 95< / span > })
}
< / code > < / pre >
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< p > 如 果 我 們 將 < code > gopl.io/ch3/mandelbrot< / code > (§ 3.3) 的 輸 出 導 入 到 這 個 工 具 的 輸 入 , 它 將 解 碼 輸 入 的 PNG格 式 圖 像 , 然 後 轉 換 爲 JPEG格 式 的 圖 像 (圖 3.3).< / p >
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< pre > < code > $ go build gopl.io/ch3/mandelbrot
$ go build gopl.io/ch10/jpeg
$ ./mandelbrot | ./jpeg > mandelbrot.jpg
Input format = png
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< / code > < / pre > < p > 要 註 意 image/png 包 的 匿 名 導 入 語 句 . 如 果 沒 有 這 一 行 語 句 , 依 然 可 以 編 譯 和 運 行 , 但 是 它 將 不 能 識 别 PNG 格 式 的 圖 像 :< / p >
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< pre > < code > $ go build gopl.io/ch10/jpeg
$ ./mandelbrot | ./jpeg > mandelbrot.jpg
jpeg: image: unknown format
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< / code > < / pre > < p > 下 面 的 代 碼 演 示 了 它 的 工 作 機 製 . 標 準 庫 提 供 了 GIF, PNG, 和 JPEG 格 式 圖 像 的 解 碼 器 , 用 戶 也 可 以 提 供 自 己 的 解 碼 器 , 但 是 爲 了 保 存 程 序 體 積 較 小 , 很 多 解 碼 器 併 沒 有 被 包 含 盡 量 , 除 非 是 明 確 需 要 支 持 的 格 式 . image.Decode 函 數 會 査 詢 支 持 的 格 式 列 表 . 列 表 的 每 個 入 口 指 定 了 四 件 事 情 : 格 式 的 名 稱 ; 一 個 用 於 描 述 這 種 圖 像 數 據 開 頭 部 分 模 式 的 字 符 串 , 用 於 解 碼 器 檢 測 識 别 ; 一 個 Decode 函 數 用 於 解 碼 圖 像 ; 一 個 DecodeConfig 函 數 用 於 解 碼 圖 像 的 大 小 和 顔 色 空 間 的 信 息 . 每 個 入 口 是 通 過 調 用 image.RegisterFormat 函 數 註 冊 , 一 般 是 在 每 個 格 式 包 的 初 始 化 函 數 中 調 用 , 例 如 image/png 包 是 這 樣 的 :< / p >
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< pre > < code class = "lang-Go" > < span class = "hljs-keyword" > package< / span > png < span class = "hljs-comment" > // image/png< / span >
< span class = "hljs-keyword" > func< / span > Decode(r io.Reader) (image.Image, error)
< span class = "hljs-keyword" > func< / span > DecodeConfig(r io.Reader) (image.Config, error)
< span class = "hljs-keyword" > func< / span > init() {
< span class = "hljs-keyword" > const< / span > pngHeader = < span class = "hljs-string" > " \x89PNG\r\n\x1a\n" < / span >
image.RegisterFormat(< span class = "hljs-string" > " png" < / span > , pngHeader, Decode, DecodeConfig)
}
< / code > < / pre >
< p > 最 終 的 效 果 是 , 主 程 序 值 需 要 匿 名 導 入 需 要 image.Decode 支 持 的 格 式 對 應 解 碼 包 就 可 以 解 碼 圖 像 了 .< / p >
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< p > 數 據 庫 包 database/sql 也 是 采 用 了 類 似 的 技 術 , 讓 用 戶 可 以 根 據 自 己 需 要 選 擇 導 入 必 要 的 數 據 庫 驅 動 . 例 如 :< / p >
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< pre > < code class = "lang-Go" > < span class = "hljs-keyword" > import< / span > (
< span class = "hljs-string" > " database/mysql" < / span >
_ < span class = "hljs-string" > " github.com/lib/pq" < / span > < span class = "hljs-comment" > // enable support for Postgres< / span >
_ < span class = "hljs-string" > " github.com/go-sql-driver/mysql" < / span > < span class = "hljs-comment" > // enable support for MySQL< / span >
)
db, err = sql.Open(< span class = "hljs-string" > " postgres" < / span > , dbname) < span class = "hljs-comment" > // OK< / span >
db, err = sql.Open(< span class = "hljs-string" > " mysql" < / span > , dbname) < span class = "hljs-comment" > // OK< / span >
db, err = sql.Open(< span class = "hljs-string" > " sqlite3" < / span > , dbname) < span class = "hljs-comment" > // returns error: unknown driver " sqlite3" < / span >
< / code > < / pre >
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< p > < strong > 練 習 10.1:< / strong > 擴 展 jpeg 程 序 , 支 持 任 意 圖 像 格 式 之 間 的 相 互 轉 換 , 使 用 image.Decode 檢 測 支 持 的 格 式 類 型 , 然 後 同 步 flag 命 令 行 標 誌 參 數 選 擇 輸 出 的 格 式 .< / p >
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< p > < strong > 練 習 10.2:< / strong > 設 計 一 個 通 用 的 壓 縮 文 件 讀 取 框 架 , 用 來 讀 取 ZIP(archive/zip) 和 POSIX tar(archive/tar) 格 式 壓 縮 的 文 檔 . 使 用 類 似 上 面 的 註 冊 機 製 來 擴 展 支 持 不 同 的 壓 縮 格 式 , 然 後 根 據 需 要 通 過 匿 名 導 入 選 擇 支 持 的 格 式 .< / p >
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< / section >
< / div >
< / div >
< / div >
< a href = "../ch10/ch10-04.html" class = "navigation navigation-prev " aria-label = "Previous page: 導入聲明" > < i class = "fa fa-angle-left" > < / i > < / a >
< a href = "../ch10/ch10-06.html" class = "navigation navigation-next " aria-label = "Next page: 包和命名" > < i class = "fa fa-angle-right" > < / i > < / a >
< / div >
< / div >
< script src = "../gitbook/app.js" > < / script >
< script src = "../gitbook/plugins/gitbook-plugin-sharing/buttons.js" > < / script >
< script src = "../gitbook/plugins/gitbook-plugin-fontsettings/buttons.js" > < / script >
< script >
require(["gitbook"], function(gitbook) {
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var config = {"katex":{},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"fontsettings":{"theme":"white","family":"sans","size":2}};
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gitbook.start(config);
});
< / script >
< / body >
< / html >
