Modifier keys from the virtual keyboard don't get passed through

[michael fox]

I'm using autopy to generate low-level Quartz keyboard events on my host machine. Most keys get passed through just fine. But for some reason the modifier keys do not. That's command, shift, Option and Control.

​https://github.com/msanders/autopy/

The relevant code looks very straightforward:

void toggleKeyCode(MMKeyCode code, const bool down, MMKeyFlags flags) { #if defined(IS_MACOSX)

CGEventRef keyEvent = CGEventCreateKeyboardEvent(NULL,

(CGKeyCode)code, down);

assert(keyEvent != NULL);

CGEventSetType(keyEvent, down ? kCGEventKeyDown : kCGEventKeyUp); CGEventSetFlags(keyEvent, flags); CGEventPost(kCGSessionEventTap, keyEvent); CFRelease(keyEvent);

#elif defined(IS_WINDOWS)

const DWORD dwFlags = down ? 0 : KEYEVENTF_KEYUP;

/* Parse modifier keys. */ if (flags & MOD_META) WIN32_KEY_EVENT_WAIT(K_META, dwFlags); if (flags & MOD_ALT) WIN32_KEY_EVENT_WAIT(K_ALT, dwFlags); if (flags & MOD_CONTROL) WIN32_KEY_EVENT_WAIT(K_CONTROL, dwFlags); if (flags & MOD_SHIFT) WIN32_KEY_EVENT_WAIT(K_SHIFT, dwFlags);

WIN32_KEY_EVENT(code, dwFlags);

#elif defined(USE_X11)

Display *display = XGetMainDisplay(); const Bool is_press = down ? True : False; /* Just to be safe. */

/* Parse modifier keys. */ if (flags & MOD_META) X_KEY_EVENT_WAIT(display, K_META, is_press); if (flags & MOD_ALT) X_KEY_EVENT_WAIT(display, K_ALT, is_press); if (flags & MOD_CONTROL) X_KEY_EVENT_WAIT(display, K_CONTROL, is_press); if (flags & MOD_SHIFT) X_KEY_EVENT_WAIT(display, K_SHIFT, is_press);

X_KEY_EVENT(display, code, is_press);

#endif }