I found the solution myself - when read in from stdin, there are 2 extra
characters - CR and LF. I just cut the string 2 characters before the end,
and it works! Thanks to those for posting replies!
On Thursday, August 24, 2017 at 11:35:31 PM UTC-4, Geoff Fridd wrote:
>
> Does anyone know why Google Go program 1 works, below, and program 2
> doesn't? The only difference - I read in the filename from the console in
> the one that doesn't work but it is a literal in the one that works... I
> tried typing in the full path for the file, and also "..sample.txt" instead
> of "sample.txt", but they didn't solve it either.
> // program 1 - this works:
>
> package main import (
> "fmt"
> "os"
> "bufio" )
>
> func main() {
> filename := getFilename()
> fmt.Println("opening:",filename)
> // fmt.Println("opening:sample.txt")
> _ , err := os.Open("sample.txt")
> // _ , err := os.Open(filename)
> if err != nil {
> panic(err)
> }
> }
>
> func getFilename() string {
> reader := bufio.NewReader(os.Stdin)
> fmt.Print("Enter file name: ")// type in anything, this file
> name not used
> filename, _ := reader.ReadString('\n')
> return filename
> }
>
>
> // program 2 - this doesn't work, gives error shown below:
>
> package main
> import (
> "fmt"
> "os"
> "bufio"
> )
>
> func main()
> filename := getFilename()
> fmt.Println("opening:",filename)
> // fmt.Println("opening: sample.txt")
> // _ , err := os.Open("sample.txt")
> _ , err := os.Open(filename)
> if err != nil {
> panic(err)
> }
> }
>
> func getFilename() string {
> reader := bufio.NewReader(os.Stdin)
> fmt.Print("Enter file name: ")// type in "sample.txt" (without
> the quotes)
> filename, _ := reader.ReadString('\n')
> return filename
> }
>
> Error message, panic invoked -
> : The filename, directory name, or volume label syntax is incorrect.
>
> goroutine 1 [running]:
> main.main()
> C:/installed programs/go/src/testopen2.go:16 +0x158
> exit status 2
>
>
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