Fayllarni o'qish. GoLang

#file #golang #o'qing

GoLang

xxxxxxxxxx
 
package main
​
import (
    "bufio"
    "fmt"
    "io"
    "io/ioutil"
    "os"
)
​
func check(e error) {
    if e != nil {
        panic(e)
    }
}
​
func main() {
​
    dat, err := ioutil.ReadFile("/tmp/dat")
    check(err)
    fmt.Print(string(dat))
​
    f, err := os.Open("/tmp/dat")
    check(err)
​
    b1 := make([]byte, 5)
    n1, err := f.Read(b1)
    check(err)
    fmt.Printf("%d bytes: %s\n", n1, string(b1[:n1]))
​
    o2, err := f.Seek(6, 0)
    check(err)
    b2 := make([]byte, 2)
    n2, err := f.Read(b2)
    check(err)
    fmt.Printf("%d bytes @ %d: ", n2, o2)
    fmt.Printf("%v\n", string(b2[:n2]))
​
    o3, err := f.Seek(6, 0)
    check(err)
    b3 := make([]byte, 2)
    n3, err := io.ReadAtLeast(f, b3, 2)
    check(err)
    fmt.Printf("%d bytes @ %d: %s\n", n3, o3, string(b3))
​
    _, err = f.Seek(0, 0)
    check(err)
​
    r4 := bufio.NewReader(f)
    b4, err := r4.Peek(5)
    check(err)
    fmt.Printf("5 bytes: %s\n", string(b4))
​
    f.Close()
}

Output result

hello
go
5 bytes: hello
2 bytes @ 6: go
2 bytes @ 6: go
5 bytes: hello

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