update ShowAlert optimize return code

README.md

@@ -311,7 +311,7 @@ func main() {
   }
 
   abool := robotgo.ShowAlert("test", "robotgo")
-  if abool == 0 {
+  if abool {
  	  fmt.Println("ok@@@ ", "ok")
   }
 

README_zh.md

@@ -308,7 +308,7 @@ func main() {
   }
 
   abool := robotgo.ShowAlert("test", "robotgo")
-  if abool == 0 {
+  if abool {
     fmt.Println("ok@@@ ", "ok")
   }
 

examples/window/main.go

@@ -20,7 +20,7 @@ import (
 func alert() {
 	// show Alert Window
 	abool := robotgo.ShowAlert("hello", "robotgo")
-	if abool == 0 {
+	if abool {
 		fmt.Println("ok@@@", "ok")
 	}
 	robotgo.ShowAlert("hello", "robotgo", "Ok", "Cancel")

robotgo.go

@@ -1361,7 +1361,7 @@ ____    __    ____  __  .__   __.  _______   ______   ____    __    ____
 */
 
 // ShowAlert show a alert window
-func ShowAlert(title, msg string, args ...string) int {
+func ShowAlert(title, msg string, args ...string) bool {
 	var (
 		// title         string
 		// msg           string
@@ -1392,7 +1392,7 @@ func ShowAlert(title, msg string, args ...string) int {
 	C.free(unsafe.Pointer(adefaultButton))
 	C.free(unsafe.Pointer(acancelButton))
 
-	return ibool
+	return ibool == 0
 }
 
 // IsValid valid the window

test/main.go

@@ -19,7 +19,7 @@ import (
 
 func aRobotgo() {
 	abool := robotgo.ShowAlert("test", "robotgo")
-	if abool == 0 {
+	if abool {
 		fmt.Println("ok@@@", "ok")
 	}