In Go, how do I capture stdout of a function into a string?

Question

In Python, for example, I can do the following:

realout = sys.stdout
sys.stdout = StringIO.StringIO()
some_function() # prints to stdout get captured in the          


        

Answer 1

This answer is similar to the previous ones but looks cleaner by using io/ioutil.

http://play.golang.org/p/fXpK0ZhXXf

package main

import (
  "fmt"
  "io/ioutil"
  "os"
)

func main() {
  rescueStdout := os.Stdout
  r, w, _ := os.Pipe()
  os.Stdout = w

  fmt.Println("Hello, playground") // this gets captured

  w.Close()
  out, _ := ioutil.ReadAll(r)
  os.Stdout = rescueStdout

  fmt.Printf("Captured: %s", out) // prints: Captured: Hello, playground
}