On Thu, 5 Oct 2017, at 08:58 AM, Johan terryn wrote:
> In following code:
>
> type JPGFile struct {
> Exif_SOI [2]byte Exif } type Exif struct { APP1Marker [2]byte
> APP1DataSize uint16 ExifHeader [6]byte TIFFHeader[6]byte }> func
> ReadFile(filename string) (JPGFile, error) {
> jpgFile := JPGFile{} in, err := os.Open(filename) defer in.Close()
> if err != nil { return jpgFile, err } binary.Read(in,
> binary.LittleEndian, &jpgFile)> return jpgFile, nil
> }
> **
> **
> **
> *binary.Read* accepts "in" (os.File) as a reader, but if I pass the
> file as a parameter to the function I get the (correct ) error message
> that "in" is not a reader, as defined in the documentation: func
> Read(r *io.Reader*, order ByteOrder, data interface{}) error>
> Or is this working as intended?
Can you provide a fuller example showing imports? Your code looks
correct and "in" is an io.Reader so it's surprising that you are getting
that message. This non-runnable version of your code compiles fine:
https://play.golang.org/p/aruCeIHFEZ
Ian
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