When I use a literal as the filename in an os.Open statement it works. When
I use a variable defined as text as the filename, it works. When I read in
the text filename from stdin, it doesn't work. Why is that? What do I need
to do to make it work? See attached text file.
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Does anyone know why 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
// 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: ")
filename, _ := reader.ReadString('\n') // filename not used
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: ") // here enter "sample.txt" (without the
quotes)....
filename, _ := reader.ReadString('\n') // filename read in is used
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
