How do you add spaces to exec.command in golang - process

Question

How do I use exec.command to start a file with spaces? Adding quotes doesn't seem to work, neither does " or %20 instead of the spaces.
package main
import (
"fmt"
"os/exec"
)
func main() {
StartProcess("C:\\File With Spaces.txt")
}
func StartProcess(Filename string) {
Filename = "\"" + Filename + "\""
cmd := exec.Command("cmd","/C start",Filename)
err := cmd.Start()
if err!=nil{
fmt.Println(err)
}
}

Answer 1

If you're trying to run an executable on Windows then you don't need command prompt. You just need to pass in the executable path to the shell and it will fire.
E.g:
func StartProcess(Filename string) {
// Filename = "cmd /C start \"" + Filename + "\""
cmd := exec.Command(Filename)
err := cmd.Start()
if err!=nil{
fmt.Println(err)
}
}
StartProcess("C:\\path to executable\\executable.exe")
That said, generally with all frameworks on Windows that start executables (Go appears to be included in this) you get in trouble when trying to concatenate your own arguments. That is why the args argument for exec.Command is variadic. So your original should have been this:
cmd := exec.Command("cmd", "/C", "start", Filename)
// ^^^^^^^^^^^^^^^ variadic arguments make Windows happy

Answer 2

This works, but only in windows
cmd := exec.Command("rundll32.exe", "url.dll,FileProtocolHandler", Filename)

Answer 3

you need to cmd.Wait and check for any errors returned by your methods
package main
import (
"bytes"
"log"
"os"
"os/exec"
)
func main() {
args := os.Args
cmd := exec.Command(args[1], args[2:]...)
var b bytes.Buffer
cmd.Stdout = &b
err := cmd.Start()
if err != nil {
log.Fatal(err)
}
if err := cmd.Wait(); err != nil {
log.Fatal(err)
}
if _, err := os.Stdout.Write(b.Bytes()); err != nil {
log.Fatal(err)
}
}