all tasks

Task/Simulate-input-Keyboard/C/simulate-input-keyboard.c

@@ -0,0 +1,114 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+int main(int argc, char *argv[])
+{
+  Display *dpy;
+  Window win;
+  GC gc;
+  int scr;
+  Atom WM_DELETE_WINDOW;
+  XEvent ev;
+  XEvent ev2;
+  KeySym keysym;
+  int loop;
+
+  /* open connection with the server */
+  dpy = XOpenDisplay(NULL);
+  if (dpy == NULL) {
+    fputs("Cannot open display", stderr);
+    exit(1);
+  }
+  scr = XDefaultScreen(dpy);
+
+  /* create window */
+  win = XCreateSimpleWindow(dpy,
+          XRootWindow(dpy, scr),
+          /* x, y, width, height, border_width */
+          10, 10, 300, 200, 1,
+          /* border, background */
+          XBlackPixel(dpy, scr), XWhitePixel(dpy, scr));
+
+  /* set window name */
+  XStoreName(dpy, win, argv[0]);
+
+  /* select kind of events we are interested in */
+  XSelectInput(dpy, win, ExposureMask | KeyPressMask | ButtonPressMask);
+
+  /* map (show) the window */
+  XMapWindow(dpy, win);
+  XFlush(dpy);
+
+  /* default graphics context */
+  gc = XDefaultGC(dpy, scr);
+
+  /* connect the close button in the window handle */
+  WM_DELETE_WINDOW = XInternAtom(dpy, "WM_DELETE_WINDOW", True);
+  XSetWMProtocols(dpy, win, &WM_DELETE_WINDOW, 1);
+
+  /* event loop */
+  loop = 1;
+  while (loop) {
+    XNextEvent(dpy, &ev);
+    switch (ev.type)
+    {
+      case Expose:
+        /* draw or redraw the window */
+        {
+          char msg1[] = "Clic in the window to generate";
+          char msg2[] = "a key press event";
+          XDrawString(dpy, win, gc, 10, 20, msg1, sizeof(msg1)-1);
+          XDrawString(dpy, win, gc, 10, 35, msg2, sizeof(msg2)-1);
+        }
+        break;
+
+      case ButtonPress:
+        puts("ButtonPress event received");
+        /*
+        printf("> button (x,y) : %d %d\n",
+               ev.xbutton.x,
+               ev.xbutton.y);
+        */
+        ev2.type = KeyPress;
+        ev2.xkey.state = ShiftMask;
+        ev2.xkey.keycode = 24 + (rand() % 33);
+        ev2.xkey.same_screen = True;
+        XSendEvent(dpy, win, True/*propagate*/, KeyPressMask, &ev2);
+        break;
+
+      case ClientMessage:
+        /* delete window event */
+        if (ev.xclient.data.l[0] == WM_DELETE_WINDOW)
+          loop = 0;
+        break;
+
+      case KeyPress:
+        /* handle key press */
+        puts("KeyPress event received");
+        printf("> keycode: %d\n", ev.xkey.keycode);
+        /* exit if q or escape are pressed */
+        keysym = XLookupKeysym(&(ev.xkey), 0);
+        if (keysym == XK_q ||
+            keysym == XK_Escape) {
+          loop = 0;
+        } else {
+          char buffer[] = "  ";
+          int nchars = XLookupString(
+                &(ev.xkey),
+                buffer,
+                2,  /* buffer size */
+                &keysym,
+                NULL );
+          if (nchars == 1)
+            printf("> Key '%c' pressed\n", buffer[0]);
+        }
+        break;
+    }
+  }
+  XDestroyWindow(dpy, win);
+  /* close connection to server */
+  XCloseDisplay(dpy);
+  return 1;
+}