diff --git a/examples/event/main.go b/examples/event/main.go
index 4d0ad4f..ae13b44 100644
--- a/examples/event/main.go
+++ b/examples/event/main.go
@@ -21,19 +21,19 @@ func add() {
 	fmt.Println("--- Please press v---")
 	eve := robotgo.AddEvent("v")
 
-	if eve == 0 {
+	if eve {
 		fmt.Println("--- You press v---", "v")
 	}
 
 	fmt.Println("--- Please press k---")
 	keve := robotgo.AddEvent("k")
-	if keve == 0 {
+	if keve {
 		fmt.Println("--- You press k---", "k")
 	}
 
 	fmt.Println("--- Please press f1---")
 	feve := robotgo.AddEvent("f1")
-	if feve == 0 {
+	if feve {
 		fmt.Println("You press...", "f1")
 	}
 }
@@ -47,12 +47,12 @@ func event() {
 
 	fmt.Println("--- Please press left mouse button---")
 	mleft := robotgo.AddEvent("mleft")
-	if mleft == 0 {
+	if mleft {
 		fmt.Println("--- You press left mouse button---", "mleft")
 	}
 
 	mright := robotgo.AddEvent("mright")
-	if mright == 0 {
+	if mright {
 		fmt.Println("--- You press right mouse button---", "mright")
 	}
 
diff --git a/keycode.go b/keycode.go
new file mode 100644
index 0000000..11db817
--- /dev/null
+++ b/keycode.go
@@ -0,0 +1,88 @@
+// Copyright 2016 The go-vgo Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// https://github.com/go-vgo/robotgo/blob/master/LICENSE
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+package robotgo
+
+var keycode = Map{
+	"`": 41,
+	"1": 2,
+	"2": 3,
+	"3": 4,
+	"4": 5,
+	"5": 6,
+	"6": 7,
+	"7": 8,
+	"8": 9,
+	"9": 10,
+	"0": 11,
+	"-": 12,
+	"+": 13,
+	//
+	"q":  16,
+	"w":  17,
+	"e":  18,
+	"r":  19,
+	"t":  20,
+	"y":  21,
+	"u":  22,
+	"i":  23,
+	"o":  24,
+	"p":  25,
+	"[":  26,
+	"]":  27,
+	"\\": 28,
+	//
+	"a": 30,
+	"s": 31,
+	"d": 32,
+	"f": 33,
+	"g": 34,
+	"h": 35,
+	"j": 36,
+	"k": 37,
+	"l": 38,
+	";": 39,
+	"'": 40,
+	//
+	"z": 44,
+	"x": 45,
+	"c": 46,
+	"v": 47,
+	"b": 48,
+	"n": 49,
+	"m": 50,
+	",": 51,
+	".": 52,
+	"/": 53,
+	//
+	"f1":  59,
+	"f2":  60,
+	"f3":  61,
+	"f4":  62,
+	"f5":  63,
+	"f6":  64,
+	"f7":  65,
+	"f8":  66,
+	"f9":  67,
+	"f10": 68,
+	"f11": 69,
+	"f12": 70,
+	// more
+	"esc":     1,
+	"tab":     15,
+	"ctrl":    29,
+	"control": 29,
+	"alt":     56,
+	"space":   57,
+	"shift":   42,
+	"enter":   28,
+	"cmd":     3675,
+	"command": 3675,
+}
diff --git a/robotgo.go b/robotgo.go
index 5d5dcee..785d188 100644
--- a/robotgo.go
+++ b/robotgo.go
@@ -1198,33 +1198,7 @@ func GetImgSize(imgPath string) (int, int) {
 //
 // mouse arguments: mleft, mright, wheelDown, wheelUp,
 // wheelLeft, wheelRight.
-func AddEvent(key string) int {
-	keycode := Map{
-		"f1":  "59",
-		"f2":  "60",
-		"f3":  "61",
-		"f4":  "62",
-		"f5":  "63",
-		"f6":  "64",
-		"f7":  "65",
-		"f8":  "66",
-		"f9":  "67",
-		"f10": "68",
-		"f11": "69",
-		"f12": "70",
-		// more
-		"esc":     "11",
-		"tab":     "15",
-		"ctrl":    "29",
-		"control": "29",
-		"alt":     "56",
-		"space":   "57",
-		"shift":   "42",
-		"enter":   "28",
-		"cmd":     "3675",
-		"command": "3675",
-	}
-
+func AddEvent(key string) bool {
 	var (
 		// cs   *C.char
 		mArr = []string{"mleft", "mright", "wheelDown",
@@ -1239,13 +1213,17 @@ func AddEvent(key string) int {
 	}
 
 	if len(key) > 1 && !mouseBool {
-		key = keycode[key].(string)
+		key = strconv.Itoa(keycode[key].(int))
 	}
 
 	geve := hook.AddEvent(key)
 	// defer C.free(unsafe.Pointer(cs))
 
-	return geve
+	if geve == 0 {
+		return true
+	}
+
+	return false
 }
 
 // StopEvent stop event listener