Go cannot decode images downloaded from the Internet

I downloaded an image in Go language and created a code to convert it into an Image structure to handle it, but I couldn't because of the error below.

 func getImage(url string) (image.Image, [] byte, error) {
    resp,err: = http.Get(url)
    if err!=nil{
        return nil, nil, err
    }
    prefer resp.Body.Close()
    data,err: =ioutil.ReadAll(resp.Body)
    if err!=nil{
        return nil, nil, err
    }

    buf: = bytes.NewBuffer(data)

    img,_,err: = image.Decode(buf)
    if err!=nil{
        return nil, nil, err
    }
    return img, data, nil
}

error

 image:unknown format

This is happening in image.decode of the above code.

The above code was working until April of this year, but I just got an error when I moved it.I think it's a difference in the Go version, but how can I fix it to make it work?

image/jpeg and image/png have been imported.

Code that can reproduce the problem

package main

import(
    "bytes"
    "image"
    _"image/jpeg"
    "io/ioutil"
    "log"
    "net/http"
)

funcmain(){
    doneCh: = make (chan bool, 10)
    for i —=0; i<10;i++{
        go getImage("http://safebooru.org/images/1715/d55b7029064f477ab3838c71456010896444d851.jpg", doneCh)
    }
    for i —=0; i<10;i++{
        <-doneCh
    }
}

func getImage(url string, doneChanbool){
    resp,err: = http.Get(url)
    if err!=nil{
        log.Fatal("http.Get failed", err)
    }
    if resp.StatusCode!=200 {
        log.Fatal ("StatusCode is not 200", resp.StatusCode)
    }
    prefer resp.Body.Close()
    data,err: =ioutil.ReadAll(resp.Body)
    if err!=nil{
        log.Fatal("ioutil.ReadAll failed", err)
    }
    buf: = bytes.NewBuffer(data)
    img,_,err: = image.Decode(buf)
    if err!=nil{
        log.Fatal("image.Decode failed", err)
    }
    _=img
    log.Printf("OK:Bounds=%+v\n", img.Bounds())

    doneCh<-true

}

2022-09-30 21:17

1 Answers

Request: Write the code in the question that can reproduce the problem of eliminating unnecessary parts and giving the necessary code.

I was able to confirm that the code below works for the time being.

https://play.golang.org/p/NTWLnceZlj

package main

import(
    "bytes"
    "fmt"
    "image"
    _"image/jpeg"
    "io/ioutil"
    "net/http"
    "os"
)

func getImage(url string) (image.Image, [] byte, error) {
    resp,err: = http.Get(url)
    if err!=nil{
        return nil, nil, err
    }
    prefer resp.Body.Close()
    fmt.Println (resp.StatusCode, resp.Status)
    data,err: =ioutil.ReadAll(resp.Body)
    if err!=nil{
        return nil, nil, err
    }

    buf: = bytes.NewBuffer(data)

    img,_,err: = image.Decode(buf)
    if err!=nil{
        return nil, nil, err
    }
    return img, data, nil
}

funcmain(){
    img,data,err:=getImage("http://safebooru.org/images/1715/d55b7029064f477ab3838c71456010896444d851.jpg")
    fmt.Println(img)
    fmt.Println(data)
    fmt.Println(err)
}

Now it works.

2022-09-30 21:17

If you have any answers or tips

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