How XTestFakeKeyEvent combines events? - c

Question

I need to send Shift+A keystrokes to get capital A. The only problem: I can't use XTestFakeKeyEvent (because it's an extension) and I don't want to pass Shift through an event.state (if possible). I tried 4 calls to XSendEvent which doesn't work. So I wonder: how XTestFakeKeyEvent does the same thing?
P.S: "my" code
// Send a fake keystroke event to an X window.
// by Adam Pierce - http://www.doctort.org/adam/
#include <X11/Xlib.h>
#include <X11/keysym.h>
// Function to create a keyboard event
XKeyEvent createKeyEvent(Display *display, Window &win,
Window &winRoot, bool press,
int keycode, int modifiers)
{
XKeyEvent event;
event.display = display;
event.window = win;
event.root = winRoot;
event.subwindow = None;
event.time = CurrentTime;
event.x = 1;
event.y = 1;
event.x_root = 1;
event.y_root = 1;
event.same_screen = True;
event.keycode = XKeysymToKeycode(display, keycode);
event.state = modifiers; // I know here I can pass Shift explicitly
// But is there a better way?
if(press)
event.type = KeyPress;
else
event.type = KeyRelease;
return event;
}
main()
{
// Obtain the X11 display.
Display *display = XOpenDisplay(0);
if(display == NULL)
return -1;
// Get the root window for the current display.
Window winRoot = XDefaultRootWindow(display);
// Find the window which has the current keyboard focus.
Window winFocus;
int revert;
XGetInputFocus(display, &winFocus, &revert);
// Send a fake key press event to the window.
XKeyEvent event = createKeyEvent(display, winFocus, winRoot, true, XK_A, 0);
XSendEvent(event.display, event.window, True, KeyPressMask, (XEvent *)&event);
// Send a fake key press event to the window.
event = createKeyEvent(display, winFocus, winRoot, true, XK_Shift_L, 0);
XSendEvent(event.display, event.window, True, KeyPressMask, (XEvent *)&event);
// Send a fake key release event to the window.
event = createKeyEvent(display, winFocus, winRoot, false, XK_Shift_L, 0);
XSendEvent(event.display, event.window, True, KeyPressMask, (XEvent *)&event);
// Send a fake key release event to the window.
event = createKeyEvent(display, winFocus, winRoot, false, XK_A, 0);
XSendEvent(event.display, event.window, True, KeyPressMask, (XEvent *)&event);
// Done.
XCloseDisplay(display);
return 0;
}