Package Main Import (
"Bufio"//Cache IO
"FMT"
"Io/ioutil"//io Toolkit
"IO"
"OS"
) Func Check (e error) {
If E! = Nil {
Panic (e)
}
} /**
* Determine if a file exists return true does not exist return 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 way: Using IO. WriteString Write file ***********************************************/
if checkfileisexist (filename) { // If the file exists
f, err1 = os. OpenFile (filename, os. O_append, 0666) //Open file
fmt. Println ("file exists");
}else {
f, err1 = os. Create (FileName) //Creation file
fmt. PRINTLN ("File does not exist");
}
check (ERR1)
n, err1: = Io. WriteString (f, wiretestring)//write to file (string)
check (ERR1)
fmt. Printf ("write%d bytes n", n); /***************************** Second way: Use Ioutil. WriteFile Write file ***********************************************/
var d1 = []byte (wiretestring);
 ERR2: = Ioutil. WriteFile ("./output2.txt", D1, 0666) //write file (byte array)
check (ERR2) /***************************** Third Way: Write files using file (write,writestring) ********************************************* **/
F, ERR3: = OS. Create ("./output3.txt")//File creation
Check (ERR3)
Defer F.close ()
N2, Err3: = F.write (D1)//write to file (byte array)
Check (ERR3)
Fmt. Printf ("write%d bytes n", N2)
N3, Err3: = f.writestring ("WRITESN")//write to file (byte array)
Fmt. Printf ("write%d bytes n", N3)
F.sync ()
/***************************** Fourth Way: Use Bufio. Newwriter writing to File ***********************************************/
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 ()
} |
