/
filetool.go
88 lines (69 loc) · 1.67 KB
/
filetool.go
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package file
import (
"fmt"
"image"
"image/png"
"io"
"log"
"net/http"
"os"
"strconv"
)
var fileCreateOpenError = "File creating/opening error"
type DownloadCallback func()
func OpenFile(fileName string) *os.File {
file, err := os.OpenFile(fileName, os.O_WRONLY|os.O_APPEND, 0644)
if err != nil {
fmt.Println(fileCreateOpenError)
panic(err)
}
return file
}
func CreateFile(fileName string) *os.File {
file, err := os.Create(fileName)
if err != nil {
fmt.Println(fileCreateOpenError)
panic(err)
}
return file
}
func CloseFile(file *os.File) {
file.Close()
}
func AppendToFile(file *os.File, stringToAppend string) {
file.WriteString(stringToAppend)
}
func AppendToFileAndClose(file *os.File, stringToAppend string) {
file.WriteString(stringToAppend)
file.Close()
}
func ReadImage(imagePath string) (outImage image.Image) {
imageFile := OpenFile(imagePath)
defer CloseFile(imageFile)
var decodeError error
outImage, decodeError = png.Decode(imageFile)
if decodeError != nil {
return
}
return outImage
}
func SaveImage(imagePath string, targetImage image.Image) {
imageFile := CreateFile(imagePath)
defer CloseFile(imageFile)
png.Encode(imageFile, targetImage)
}
func DownloadImage(imageURL string, imageName string, callback DownloadCallback) {
imageFile := CreateFile(imageName)
resp, err := http.Get(imageURL)
if err != nil {
log.Fatal(err)
}
defer resp.Body.Close()
size, err2 := io.Copy(imageFile, resp.Body)
if err2 != nil {
log.Fatal(err2)
}
fmt.Println("Image loaded, size = " + strconv.FormatInt(size, 10))
CloseFile(imageFile)
callback()
}