How to save with ioutil.WriteFile in a specific folder?

Getting Help
1 
//this page gives you custom images base64 small for testing
package main

import (
    b64 "encoding/base64"
    "io/ioutil"
  "time"
  "math/rand"
)


func main() {
  data := "iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAQAAADa613fAAAAaUlEQVR42u3PQREAAAgDINc/9Izg34MGpJ0XIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiIiJyWYprx532021aAAAAAElFTkSuQmCC"
    sDec, _ := b64.StdEncoding.DecodeString(data)

  rand.Seed(time.Now().UnixNano())
    ioutil.WriteFile( randSeq(12) +".jpg",sDec, 0644)//this works

  //this dosnt work
  ioutil.TempDir( "img/", randSeq(12) +".jpg") //heres how i need it
}


var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")

func randSeq(n int) string {
    b := make([]rune, n)
    for i := range b {
        b[i] = letters[rand.Intn(len(letters))]
    }
    return string(b)
}
2

It should work, assuming the path does actually exist and is writable for the user that has started the program.

Also as a related note: check the returned error value and tell us what it says unless you don’t already understand it on your own…

3

Dosnt return any error ill try one more time tonight but is weird that this code dosnt works

4

You can just provide the path, relative or absolute to WriteFile, not sure though what you want with the TempFile…

5

Do you want to write the file in img/ like img/foo.jpg? Or do you want to first create a temporary directory under img/ and the *then write the file inside this temporary directory like foo/someRandomTempDir/foo.jpg?

1 Like
6

write the file in img/ like img/foo.jpg

7

Then just do ioutil.WriteFile("img/foo.jpg", data, mode).

1 Like
8

Try something like this:

    path := "img/" + randSeq(12) + ".jpg"
    if err := ioutil.WriteFile(path, sDec, 0644); err != nil {
        log.Panic(err)
    }

    fmt.Println(path)

see https://play.golang.org/p/Mi75N2pI_V1

1 Like
10

what does?

Because func writefile has following signature and it is fairly simple to see that it in fact takes three:

WriteFile(filename string, data []byte, perm os.FileMode) error

1 Like
13

Yes but it dosnt takes a locations so thats where the problem is, i thought i fixed but no

14

of course it does take the location, it just this location needs to exist before you write there

15

By this point im confused for a simple thing mm,
how to make this code with my folder location called img

ioutil.WriteFile(randSeq(12)+".jpg", sDec, 0644)
16

You where right i was just confused this is how it works

ioutil.WriteFile("img/"+randSeq(12)+".jpg", sDec, 0644)
17

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