Note this requires the uipnut kernel mode to be loaded, and the running user to have write access to the uinput device.
First, write the Java code containing the native library references:
public class X11Input {
//Singleton
private static X11Input u;
public static X11Input getInstance() {
if(u == null) {
u = new X11Input();
}
return u;
}
//native methods
//private - called to destroy, and init native interface
private native void destroy();
private native void init();
//public functions
public native void mouseMove(int x, int y);
public native void keyPress(int key);
public native void keyRelease(int key);
//Load native library
static {
System.loadLibrary("X11Input");
}
//We add the Shutdown hook, and init the uinput interface in the contructor
public X11Input() {
init();
Runtime.getRuntime().addShutdownHook(new Thread() {
public void run() {
X11Input.getInstance().destroy();
System.out.println("Destroying the X11Input singleton jni");
}
});
}
}
Next, using the compiled class and javah, generate a c header file:
javah -jni org.wiiboard.x11.X11Input
This is executed at the root of the bin directory, and will generate the file:
org_wiiboard_x11_X11Input.h
Next, write the c code that adds the workings behind the the functions:
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "UinputTest.h"
/* Globals */
static int uinp_fd = -1;
struct uinput_user_dev uinp; // uInput device structure
struct input_event event; // Input device structure
/* Setup the uinput device */
int setup_uinput_device()
{
// Temporary variable
int i=0;
// Open the input device
uinp_fd = open("/dev/input/uinput", O_WRONLY | O_NDELAY);
if (uinp_fd == 0)
{
printf("Unable to open /dev/input/uinput\n");
return -1;
}
memset(&uinp,0,sizeof(uinp)); // Intialize the uInput device to NULL
strncpy(uinp.name, "PolyVision Touch Screen", UINPUT_MAX_NAME_SIZE);
uinp.id.version = 4;
uinp.id.bustype = BUS_USB;
// Setup the uinput device
ioctl(uinp_fd, UI_SET_EVBIT, EV_KEY);
ioctl(uinp_fd, UI_SET_EVBIT, EV_REP);
ioctl(uinp_fd, UI_SET_EVBIT, EV_REL);
ioctl(uinp_fd, UI_SET_RELBIT, REL_X);
ioctl(uinp_fd, UI_SET_RELBIT, REL_Y);
for (i=0; i <> 0 && ( x != 0 || y != 0 )) {
if(x != 0) {
memset(&event, 0, sizeof(event));
gettimeofday(&event.time, NULL);
event.type = EV_REL;
event.code = REL_X;
event.value = x;
write(uinp_fd, &event, sizeof(event));
}
if(y!=0) {
memset(&event, 0, sizeof(event));
gettimeofday(&event.time, NULL);
event.type = EV_REL;
event.code = REL_Y;
event.value = y;
write(uinp_fd, &event, sizeof(event));
}
memset(&event, 0, sizeof(event));
gettimeofday(&event.time, NULL);
event.type = EV_SYN;
event.code = SYN_REPORT;
event.value = 0;
write(uinp_fd, &event, sizeof(event));
}
}
JNIEXPORT void JNICALL
Java_org_wiiboard_x11_X11Input_keyPress(JNIEnv *env, jobject obj, jint key)
{
memset(&event, 0, sizeof(event));
gettimeofday(&event.time, NULL);
event.type = EV_KEY;
event.code = key;
event.value = 1;
write(uinp_fd, &event, sizeof(event));
memset(&event, 0, sizeof(event));
gettimeofday(&event.time, NULL);
event.type = EV_SYN;
event.code = SYN_REPORT;
event.value = 0;
write(uinp_fd, &event, sizeof(event));
}
JNIEXPORT void JNICALL
Java_org_wiiboard_x11_X11Input_keyRelease(JNIEnv *env, jobject obj, jint key)
{
memset(&event, 0, sizeof(event));
gettimeofday(&event.time, NULL);
event.type = EV_KEY;
event.code = key;
event.value = 0;
write(uinp_fd, &event, sizeof(event));
memset(&event, 0, sizeof(event));
gettimeofday(&event.time, NULL);
event.type = EV_SYN;
event.code = SYN_REPORT;
event.value = 0;
write(uinp_fd, &event, sizeof(event));
}
JNIEXPORT void JNICALL
Java_org_wiiboard_x11_X11Input_init(JNIEnv *env, jobject obj)
{
setup_uinput_device();
}
JNIEXPORT void JNICALL
Java_org_wiiboard_x11_X11Input_destroy(JNIEnv *env, jobject obj)
{
destroy_uinput_device();
}Now compile:
gcc --share -o libX11Input.so -I
That will generate the libX11Input.so library.
Now you can run the java code with the java.lirary.path pointing to your new .so file's directory:
java -Djava.library.path=. X11InputTest
