File content:
ABCDEFGHI
HELLO GOLANG
package main
import (
"fmt"
"os"
"io"
)
func main() {
fileName := "C:\\Robert\\Log Analysis\\tools_go\\vdn_sqlInterface\\"
file, err := (fileName, os.O_RDWR, 0666)
if err != nil {
("Open file error!", err)
return
}
defer ()
stat, err := ()
if err != nil {
panic(err)
}
var size = ()
("file size=", size)
// define read block size = 2
buf := make([]byte, 2)
for {
length, err := (buf)
if err != nil {
if err == {
break
} else {
("Read file error!", err)
return
}
}
(length, string(buf))
}
("File read ok!")
}
Output:
Read 2 bytes each time and output
file size= 23 2 AB 2 CD 2 EF 2 GH 2 I 2 H 2 EL 2 LO 2 G 2 OL 2 AN 1 GN File read ok!
Supplement: The address changes before and after golang array append
I won't say much nonsense, let's just read the code~
func main() {
res := make([]int, 0)
res = append(res, 1) //The address before and after append in the same function remains unchanged for i, v := range res {
println(i,v)
}
}
Print:
0 1
func solve(res []int) {
res = append(res, 1) //The address before and after append is changed without the same function}
func main() {
res := make([]int, 0)
for i, v := range res {
println(i,v)
}
}
Print:
null
Because append changed the address of the original res. So change it to:
func solve(res []int) []int {
return append(res, 1)
}
func main() {
res := make([]int, 0)
for i, v := range solve(res) {
println(i,v)
}
}
Print:
0 1
The above is personal experience. I hope you can give you a reference and I hope you can support me more. If there are any mistakes or no complete considerations, I would like to give you advice.