1.Add linux mouse control test;2.Fix unused variables warnning

test/linux_mouse_control/mouse_control.cpp

@@ -0,0 +1,150 @@
+#include <X11/Xlib.h>
+#include <fcntl.h>
+#include <linux/uinput.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <cstring>
+#include <iostream>
+#include <sstream>
+
+using namespace std;
+
+int fd;
+Display *dpy;
+
+void initMouse();
+void destroyMouse();
+void mouseLeftClick();
+void mouseRightClick();
+void mouseGetPosition(int &x, int &y);
+void mouseMove(int xdelta, int ydelta);
+
+void initMouse() {
+  fd = open("/dev/uinput", O_WRONLY | O_NONBLOCK);
+  ioctl(fd, UI_SET_EVBIT, EV_KEY);
+  ioctl(fd, UI_SET_KEYBIT, BTN_RIGHT);
+  ioctl(fd, UI_SET_KEYBIT, BTN_LEFT);
+  ioctl(fd, UI_SET_EVBIT, EV_ABS);
+  ioctl(fd, UI_SET_ABSBIT, ABS_X);
+  ioctl(fd, UI_SET_ABSBIT, ABS_Y);
+  ioctl(fd, UI_SET_EVBIT, EV_REL);
+
+  struct uinput_user_dev uidev;
+  memset(&uidev, 0, sizeof(uidev));
+  snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "VirtualMouse");
+  uidev.id.bustype = BUS_USB;
+  uidev.id.version = 1;
+  uidev.id.vendor = 0x1;
+  uidev.id.product = 0x1;
+  uidev.absmin[ABS_X] = 0;
+  uidev.absmax[ABS_X] = 3200;
+  uidev.absmin[ABS_Y] = 0;
+  uidev.absmax[ABS_Y] = 900;
+
+  write(fd, &uidev, sizeof(uidev));
+  ioctl(fd, UI_DEV_CREATE);
+
+  sleep(2);
+}
+
+void mouseLeftClick() {
+  struct input_event ev_click, ev_sync;
+  memset(&ev_click, 0, sizeof(ev_click));
+  memset(&ev_sync, 0, sizeof(ev_sync));
+
+  ev_click.type = EV_KEY;
+  ev_click.code = BTN_LEFT;
+  ev_click.value = 1;
+
+  // write left click event
+  write(fd, &ev_click, sizeof(ev_click));
+
+  // sync left click event
+  ev_sync.type = EV_SYN;
+  write(fd, &ev_sync, sizeof(ev_sync));
+}
+
+void mouseRightClick() {
+  struct input_event ev_click, ev_sync;
+  memset(&ev_click, 0, sizeof(ev_click));
+  memset(&ev_sync, 0, sizeof(ev_sync));
+
+  ev_click.type = EV_KEY;
+  ev_click.code = BTN_RIGHT;
+  ev_click.value = 1;
+
+  // write right click event
+  write(fd, &ev_click, sizeof(ev_click));
+
+  // sync right click event
+  ev_sync.type = EV_SYN;
+  write(fd, &ev_sync, sizeof(ev_sync));
+}
+
+void mouseSetPosition(int x, int y) {
+  struct input_event ev[2], ev_sync;
+  memset(ev, 0, sizeof(ev));
+  memset(&ev_sync, 0, sizeof(ev_sync));
+
+  ev[0].type = EV_ABS;
+  ev[0].code = ABS_X;
+  ev[0].value = x;
+  ev[1].type = EV_ABS;
+  ev[1].code = ABS_Y;
+  ev[1].value = y;
+
+  int res_w = write(fd, ev, sizeof(ev));
+
+  std::cout << "res w : " << res_w << "\n";
+
+  ev_sync.type = EV_SYN;
+  ev_sync.value = 0;
+  ev_sync.code = 0;
+  int res_ev_sync = write(fd, &ev_sync, sizeof(ev_sync));
+
+  std::cout << "res syn : " << res_ev_sync << "\n";
+}
+
+void initDisplay() { dpy = XOpenDisplay(NULL); }
+
+void destroyMouse() { ioctl(fd, UI_DEV_DESTROY); }
+
+void mouseMove(int xdelta, int ydelta) {
+  int xx, yy;
+  mouseGetPosition(xx, yy);
+
+  mouseSetPosition(xx + xdelta, yy + ydelta);
+}
+
+void mouseGetPosition(int &x, int &y) {
+  Window root, child;
+  int rootX, rootY, winX, winY;
+  unsigned int mask;
+
+  XQueryPointer(dpy, DefaultRootWindow(dpy), &root, &child, &rootX, &rootY,
+                &winX, &winY, &mask);
+
+  std::cout << "root x : " << rootX << "\n";
+  std::cout << "root y : " << rootY << "\n";
+
+  x = rootX;
+  y = rootY;
+}
+
+int main() {
+  initMouse();
+  initDisplay();
+
+  int tempx, tempy;
+
+  for (int i = 0; i < 5; ++i) {
+    mouseMove(100, 100);
+    sleep(1);
+    std::cout << "i : " << i << "\n";
+  }
+
+  destroyMouse();
+  return 0;
+}