Using user input to open file

[HeaterUp]

As the title implies, I'm working on trying to read input from a user (The file name) then use that input to open the file. For some reason if i put the file name in manually "myfile.txt" it will open but when using the variable it is stored to userinput it will not open 

 

reader := bufio.NewReader(os.Stdin)

    fmt.Print("Enter text: ")

    userinput, _ := reader.ReadString('\n')

    fmt.Println(userinput)

 

file, err := os.Open("myfile.txt")       //need to get this to take a userinput (Currently gives an error when trying os.Open(userinput)) 

        if err != nil {

            log.Fatal(err)

        }

        defer file.Close()

 

        scanner := bufio.NewScanner(file)

 

        for scanner.Scan() {

            fmt.Println(scanner.Text()) //need to get this into an array seperated by spaces (Currently reads line by line)

        }

 

this is currently what I have, os.Open is the preferred way id like to do this (mostly because i already have the scanner set up) but I'm more than happy to change code if anyone can help me with this issue.

Thanks

[Meic]

The user input will have a new line ('\n') at the end, you need to remove that before you use it.

 

Try:

reader := bufio.NewReader(os.Stdin)
    fmt.Print("Enter text: ")
    userinput, _ := reader.ReadString('\n')
    userinput = strings.TrimSuffix(userinput, "\n")
    fmt.Println(userinput)

 

 

More info: https://flaviocopes.com/golang-remove-new-line-from-readstring/

[HeaterUp]

8 hours ago, Meic said:

The user input will have a new line ('\n') at the end, you need to remove that before you use it.

 

Try:

reader := bufio.NewReader(os.Stdin)
    fmt.Print("Enter text: ")
    userinput, _ := reader.ReadString('\n')
    userinput = strings.TrimSuffix(userinput, "\n")
    fmt.Println(userinput)

 

 

More info: https://flaviocopes.com/golang-remove-new-line-from-readstring/

Ah, this makes sense now, I'll try this and hopefully this should fix the problem thanks.

[JacobFW]

 

On 6/29/2018 at 4:42 AM, HeaterUp said:

As the title implies, I'm working on trying to read input from a user (The file name) then use that input to open the file. For some reason if i put the file name in manually "myfile.txt" it will open but when using the variable it is stored to userinput it will not open

Just an fyi to help make things easier for you in the future, but I would put the language you're using in the title of your ticket, preferably at the beginning and in parentheses or square brackets to differentiate it from the rest of the text.  That way it'll stand out more to people with experience in that language.

 

I'm happy that Meic was able to help you, and I hope that solved your problem.