write some bytes to a file in golang

writefile.go

package main

import (
  "fmt"
  "os"
"encoding/binary"
 )

func WritePPMHeader(outf *os.File) {
  fheader := []byte("P6\n")
  binary.Write(outf,binary.LittleEndian,fheader)
  fheader2 := []byte("640 480\n")
  binary.Write(outf,binary.LittleEndian,fheader2)
  fheader3 := []byte("255\n")
  binary.Write(outf,binary.LittleEndian,fheader3)
}

func main() {

  outf,_ := os.Create("junk.bin")

  WritePPMHeader(outf)

  for i :=0;i<50;i++ {
    var ii uint8 = uint8(i)
    err := binary.Write(outf, binary.LittleEndian, ii)
    if err != nil {
      fmt.Println("err!",err)
    }
  }
  outf.Close()

}