Package main Import (
"Bufio" // cache IO
"Fmt"
"Io/ioutil" // io Toolkit
"Io"
"OS"
) Func check (e error ){
If e! = Nil {
Panic (e)
}
} /**
* Checks whether a file exists and returns true if it does not exist. returns false.
*/
Func checkFileIsExist (filename string) (bool ){
Var exist = true;
If _, err: = OS. Stat (filename); OS. IsNotExist (err ){
Exist = false;
}
Return exist;
} /**
From: http://www.isharey.com /? P = 143
*/ Func main (){
Var wireteString = "Test n"
Var filename = "./output1.txt ";
Var f * OS. File
Var err1 error;
/***************************** First method: Use io. writeString Write File ************************************* **********/
If checkFileIsExist (filename) {// if the object exists
F, err1 = OS. OpenFile (filename, OS. O_APPEND, 0666) // open the file
Fmt. Println ("file exists ");
} Else {
F, err1 = OS. Create (filename) // Create a file
Fmt. Println ("file does not exist ");
}
Check (err1)
N, err1: = io. WriteString (f, wireteString) // write a file (string)
Check (err1)
Fmt. Printf ("write % d bytes n", n ); /***************************** Method 2: Use ioutil. writeFile Write File ************************************* **********/
Var d1 = [] byte (wireteString );
Err2: = ioutil. WriteFile ("./output2.txt", d1, 0666) // write a file (byte array)
Check (err2) /***************************** Method 3: Use File (Write, writeString) ************************************** *********/
F, err3: = OS. Create ("./output3.txt") // Create a file
Check (err3)
Defer f. Close ()
N2, err3: = f. Write (d1) // Write a file (byte array)
Check (err3)
Fmt. Printf ("write % d bytes n", n2)
N3, err3: = f. WriteString ("writesn") // write a file (byte array)
Fmt. Printf ("write % d bytes n", n3)
F. Sync ()
/***************************** Method 4: Use bufio. newWriter writes files ************************************* **********/
W: = bufio. NewWriter (f) // create a new Writer object
N4, err3: = w. WriteString ("bufferedn ")
Fmt. Printf ("write % d bytes n", n4)
W. Flush ()
F. Close ()
} |
