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                ## 讀取文件 ### ioutil.ReadFile(")讀取整個文件 ~~~go ioutil.ReadFile("/home/naveen/go/src/filehandling/test.txt") // 絕對路徑 ~~~ ### 分塊讀取文件 當文件非常大時,尤其在 RAM 存儲量不足的情況下,把整個文件都讀入內存是沒有意義的。更好的方法是分塊讀取文件。這可以使用bufio包來完成 ~~~go func main() { fptr := flag.String("fpath", "test.txt", "file path to read from") flag.Parse() f, err := os.Open(*fptr) if err != nil { log.Fatal(err) } defer func() { if err = f.Close(); err != nil { log.Fatal(err) } }() r := bufio.NewReader(f) // 緩沖讀取器(buffered reader) b := make([]byte, 3) for { _, err := r.Read(b) if err != nil { fmt.Println("Error reading file:", err) break } fmt.Println(string(b)) } } ~~~ ### 逐行讀取文件 ~~~go func main() { fptr := flag.String("fpath", "test.txt", "file path to read from") flag.Parse() f, err := os.Open(*fptr) if err != nil { log.Fatal(err) } defer func() { if err = f.Close(); err != nil { log.Fatal(err) } }() s := bufio.NewScanner(f) for s.Scan() { fmt.Println(s.Text()) } err = s.Err() if err != nil { log.Fatal(err) } } ~~~ ### 將文件綁定在二進制文件中 packr包可以將文本文件捆綁在二進制文件; ~~~bash go get -u github.com/gobuffalo/packr/... ~~~ `packr`會把靜態文件(例如`.txt`文件)轉換為`.go`文件,接下來`.go`文件會直接嵌入到二進制文件中;packr 非常智能,在開發階段可以從磁盤加載文件 示例: ~~~go func main() { box := packr.NewBox("../filehandling") data := box.String("test.txt") fmt.Println("Contents of file:", data) } ~~~ ~~~bash $ go install filehandling $ packr install -v filehandling $ ./filehandling ~~~
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