英文:
Animated gif not saved correctly
问题
我使用这段代码将以base64编码的图像文件保存并从json中发送：
func SaveBase64ImageToDisk(imageString string) (interface{}, error) {
imageExt := strings.ToLower(strings.Split(strings.Split(imageString, ";")[0], "/")[1])
imageData := strings.Split(imageString, ";base64,")[1]
imageReader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(imageData))
if decodedImage, _, err := image.Decode(imageReader); err != nil {
return nil, err
} else {
imageFileName, _ := _saveImage(imageExt, &decodedImage)
return imageFileName.(string), nil
}
}
func _saveImage(imageExt string, decodedImage *image.Image) (interface{}, error) {
dir, err := os.Getwd()
if err != nil {
log.Fatal(err)
}
path := dir + "/media/photos/"
imageFileName := getRandomFileName("randomstr") + "." + imageExt
if imageFile, err := os.Create(path + imageFileName); err != nil {
return nil, err
} else {
defer imageFile.Close()
if imageExt == "png" {
if err = png.Encode(imageFile, *decodedImage); err != nil {
return nil, err
}
} else if imageExt == "jpg" {
if err = jpeg.Encode(imageFile, *decodedImage, nil); err != nil {
return nil, err
}
} else if imageExt == "gif" {
if err = gif.Encode(imageFile, *decodedImage, nil); err != nil {
return nil, err
}
}
return imageFileName, nil
}
}
func getRandomFileName(prefix string) string {
rand.Seed(time.Now().UTC().UnixNano())
l := len(prefix)
result := make([]byte, l)
for i := 0; i < l; i++ {
result[i] = CHARS[rand.Intn(len(CHARS))]
}
return string(result)
}
对于png和jpeg格式的图像，它可以正常工作，但是动画gif图像保存为静态图像，或者在某些图像查看器中根本无法显示。我想知道如何修复这个问题？
英文:
I use this snippet to save image files encoded as base64 and sent from json:
func SaveBase64ImageToDisk(imageString string) (interface{}, error) {
imageExt := strings.ToLower(strings.Split(strings.Split(imageString, ";")[0], "/")[1])
imageData := strings.Split(imageString, ";base64,")[1]
imageReader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(imageData))
if decodedImage, _, err := image.Decode(imageReader); err != nil {
return nil, err
} else {
imageFileName, _ := _saveImage(imageExt, &decodedImage)
return imageFileName.(string), nil
}
}
func _saveImage(imageExt string, decodedImage *image.Image) (interface{}, error) {
dir, err := os.Getwd()
if err != nil {
log.Fatal(err)
}
path := dir + "/media/photos/"
imageFileName := getRandomFileName("randomstr") + "." + imageExt
if imageFile, err := os.Create(path + imageFileName); err != nil {
return nil, err
} else {
defer imageFile.Close()
if imageExt == "png" {
if err = png.Encode(imageFile, *decodedImage); err != nil {
return nil, err
}
} else if imageExt == "jpg" {
if err = jpeg.Encode(imageFile, *decodedImage, nil); err != nil {
return nil, err
}
} else if imageExt == "gif" {
if err = gif.Encode(imageFile, *decodedImage, nil); err != nil {
return nil, err
}
}
return imageFileName, nil
}
}
func getRandomFileName(prefix string) string {
rand.Seed(time.Now().UTC().UnixNano())
l := len(prefix)
result := make([]byte, l)
for i := 0; i < l; i++ {
result[i] = CHARS[rand.Intn(len(CHARS))]
}
return string(result)
}
It works fine for png and jpeg but animated gif images are saved as a still image, or are not displayed at all at some image viewers. I'm wondering how can I fix this?
答案1
得分: 1
你的编码部分是正确的，但是对于解码，你应该使用image/gif包。
decodedImage, _, err := gif.Decode(imageReader)
英文:
Your Encode part is correct, however for decoding you should use image/gif package.
decodedImage, _, err := gif.Decode(imageReader)
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