该进程无法访问该文件，因为它正被 Golang 中的另一个进程使用

Question

The process cannot access the file ... because it is being used by another process

I can't Remover Zip file with this code ..

it's possible? extract and delete the file in one code.

Code

package main

import (
    "archive/zip"
    "fmt"
    "io"
    "log"
    "net/http"
    "os"
    "path/filepath"
    "strings"
)

func main() {
    url := "https://230c07c8-77b2-4c0d-9b82-8c6501a5bc45.filesusr.com/archives/b7572a_9ec985e0031042ef912cb40cafbe6376.zip?dn=7.zip"
    out, _ := os.Create("E:\\experi\\1234567890.zip")
    defer out.Close()
    resp, _ := http.Get(url)
    defer resp.Body.Close()
    _, _ = io.Copy(out, resp.Body)
    files, err := Unzip("E:\\experi\\1234567890.zip", "E:\\experi\\1234567890")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("Unzipped the following files:\n" + strings.Join(files, "\n"))
}

func Unzip(src string, destination string) ([]string, error) {

    var filenames []string

    r, err := zip.OpenReader(src)

    if err != nil {


        return filenames, err
    }

    defer r.Close()

    for _, f := range r.File {

        fpath := filepath.Join(destination, f.Name)

        if !strings.HasPrefix(fpath, filepath.Clean(destination)+string(os.PathSeparator)){
            return filenames, fmt.Errorf("%s is an illegal filepath", fpath)
        }

        filenames = append(filenames, fpath)

        if f.FileInfo().IsDir() {

            os.MkdirAll(fpath, os.ModePerm)
            continue
        }
        if err = os.MkdirAll(filepath.Dir(fpath), os.ModePerm); err != nil {
            return filenames, err
        }
        outFile, err := os.OpenFile(fpath,
            os.O_WRONLY|os.O_CREATE|os.O_TRUNC | os.O_RDWR,
            f.Mode())
        if err != nil {
            return filenames, err
        }

        rc, err := f.Open()

        if err != nil {
            return filenames, err
        }

        _, err = io.Copy(outFile, rc)
        outFile.Close()
        rc.Close()

        if err != nil {
            return filenames, err
        }
    }
    
    removeFile()
    return filenames, nil
}


func removeFile()  {
    error := os.Remove("E:\\experi\\1234567890.zip")
    if error != nil {
        log.Fatal(error)
    }
}

Output

output text

2020/10/28 13:09:04 remove E:\experi\1234567890.zip: The process cannot access the file because it is being used by another process.

Process finished with exit code 1

Any other way to do this same thing ?

Did I go wrong anywhere?

Help Would be Much Appreciated. Thanks in Advance. :)

Answer 1

out, _ := os.Create("E:\\\\experi\\\\1234567890.zip") creates or truncates the file and returns you a *File (so the file is open).

defer out.Close() closes the file "the moment the surrounding function returns" ( spec ).

So at the time you call Unzip you have the file open. To fix this call out.Close() before the call to Unzip (and please don't assume that calls complete without error).

Answer 2

If you close using the defer, it is closed after performing up to the last line of the function. You must explicitly close the file before remove it.