The problem is that the function’s return type is already *os.File (rather than
io.WriteCloser or some other interface), so the type assertion is pointless.
Andy
> On May 7, 2020, at 5:09 AM, André kouamé <kouameandr...@gmail.com> wrote:
>
> Hi,
>
> I want to check, if the value return by my function has the type *os.File
> This my code :
> func createFile(filename string) (*os.File, error) {
> f, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
> return f, err
>
> }
> //Test code
> filename := "testfile"
> f, _ := createFile(filename)
> c := &f.(*os.File)
> fmt.Println(c)
> Error return :
> invalid type assertion: f.(*os.File) (non-interface type *os.File on left)
> Process exiting with code: 1
>
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