golang file操作ノート
1、ファイルコピー:
実行結果:
package main
import (
"fmt"
"io"
"os"
"strings"
)
func main() {
list := os.Args
if len(list) != 3 {
fmt.Println(" , :xxx.go ")
return
}
fmt.Println(" :", list[1], " ", " :", list[2])
fmt.Println(" Yy :")
str := ""
fmt.Scanln(&str)
if strings.ToLower(str) == "y" {
w, err := CopyFile(list[1], list[2])
if err != nil {
fmt.Println(err)
return
}
fmt.Println(" , :", w)
} else {
fmt.Println(" !")
}
}
func CopyFile(srcFileName, dstFileName string) (written int64, err error) {
srcFile, err := os.Open(srcFileName)
if err != nil {
return
}
defer srcFile.Close()
dstFile, err := os.OpenFile(dstFileName, os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return
}
defer dstFile.Close()
return io.Copy(dstFile, srcFile)
}
実行結果:
d:\goprojects\src\day1\ >go run main.go d:\ V1.0.pdf d:\test.pdf
: d:\ V1.0.pdf : d:\test.pdf
Yy :
y
, : 4146835
d:\goprojects\src\day1\ >go run main.go d:\ V1.0.pdf d:\test.pdf
: d:\ V1.0.pdf : d:\test.pdf
Yy :
n
!
d:\goprojects\src\day1\ >