从Golang应用发送字符串时出现意外的StrComp结果

Question

In my code below I've set up a ReadString which reads user input and passes it along in a exec.Command.

This works just fine, but when I try to compare the string with a hardcoded string in vbscript (in this case I'm comparing it to "hello") it always fails even when the user input is "hello" as well.

If I just run the vbscript through the command line like this however...

 cscript.exe script.vbs hello

...then the StrComp works as intended so I suspect that it's either a data type issue or there's some extra character that's passed along in the golang app.

Here's the main.go:

package main

import (
    "fmt"
    "os/exec"
    "bufio"
    "os"
)

func main() {

    buf := bufio.NewReader(os.Stdin)

    fmt.Print("Type something: ")
    text, err := buf.ReadString('
')
    if err != nil {
        fmt.Println(err)
    } else {
        args := []string{"./script.vbs", string(text)}
        exec.Command("cscript.exe", args...).Run()
    }
}

And here's the script.vbs

MsgBox(WScript.Arguments(0))

If StrComp(WScript.Arguments(0), "hello") = 0 Then
    MsgBox("it's the same")
Else
    MsgBox("It's not the same...")
End If

Answer 1

When working with windows, line endings are " ". I don't know whether ReadString() should remove the delimiter, but even then text will contain an invisible . Use strings.TrimSpace to be on the save side:

package main

import (
    "fmt"
    "os/exec"
    "bufio"
    "os"
    "strings"
)

func main() {

    buf := bufio.NewReader(os.Stdin)

    fmt.Print("Type something: ")
    text, err := buf.ReadString('
')
    fmt.Printf("0 got: %T %v %q
", text, text, text)
    text = strings.TrimSpace(text)
    fmt.Printf("1 got: %T %v %q", text, text, text)
    if err != nil {
        fmt.Println(err)
    } else {
        args := []string{"./script.vbs", string(text)}
        exec.Command("cscript.exe", args...).Run()
    }
}

output (of main; use your imagination for the VBScript MsgBoxes):

main
Type something: hello
0 got: string hello
 "hello
"
1 got: string hello "hello"