Go (golang) Tutorials - Buffered File I/O

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#golang #go #input #output #file

File I/O - Buffered I/O
--------------------------
= Writing Data to File
= Reading from a File
= Appending to a File

----------------
package main
import ("os"
"bufio"
)
func main(){
file,err:=os.Create("newfile")
if err!=nil {
panic(err)
}
buf:=bufio.NewWriter(file) //Create a buffer for the os File
buf.WriteString("Writing Data to Buffer\n") //Write data to buffer
buf.Flush() //clears the buffer data and writes to the file
file.Close()
}

---------------
package main
import ("os"
"bufio"
"fmt"
)
func main(){
file,_:=os.Open("newfile")
reader:=bufio.NewReader(file)
data,_:=reader.Peek(50)
fmt.Println(string(data))
file.Close()
}

--------------
package main
import "os"
func main(){
//Opens an existing file with APPEND mode and Read/Write permission
file,err:=os.OpenFile("newfile",os.O_APPEND|os.O_WRONLY,0644)
if err !=nil {
panic(err)
}
file.WriteString("Trying to append\n")
file.Close()
}