我正在尝试使用绝对坐标移动光标.这是代码：

#include

#include

#include

#include

#include

#include

#include

#include

#include

#define die(str,args...) do { \

perror(str); \

exit(EXIT_FAILURE); \

} while(0)

int fd;

static void signal_handler(int signo)

{

printf("\nCaught SIGINT\n");

if(ioctl(fd,UI_DEV_DESTROY) < 0)

die("error: cannot destroy uinput device\n");

else printf("Destroyed uinput_user_dev\n\n");

close(fd);

exit(EXIT_SUCCESS);

}

int

main(void)

{

struct uinput_user_dev uidev;

struct input_event ev;

int x,y;

int i;

if(signal(SIGINT,signal_handler)==SIG_ERR)

{

printf("error registering signal handler\n");

exit(EXIT_FAILURE);

}

fd = open("/dev/uinput",O_WRONLY | O_NONBLOCK);

if(fd < 0)

die("error: open");

if(ioctl(fd,UI_SET_EVBIT,EV_KEY) < 0)

die("error: ioctl");

// if(ioctl(fd,UI_SET_KEYBIT,BTN_MOUSE) < 0)

// die("error: ioctl");

if(ioctl(fd,BTN_LEFT) < 0)

die("error: ioctl");

if(ioctl(fd,BTN_RIGHT) < 0)

die("error: ioctl");

if(ioctl(fd,EV_REL) < 0)

die("error: ioctl");

if(ioctl(fd,UI_SET_RELBIT,REL_X) < 0)

die("error: ioctl");

if(ioctl(fd,REL_Y) < 0)

die("error: ioctl");

if(ioctl(fd,EV_ABS) < 0)

die("error: ioctl");

if(ioctl(fd,UI_SET_ABSBIT,ABS_X) < 0)

die("error: ioctl");

if(ioctl(fd,ABS_Y) < 0)

die("error: ioctl");

memset(&uidev,sizeof(uidev));

snprintf(uidev.name,UINPUT_MAX_NAME_SIZE,"uinput-sample");

uidev.id.bustype = BUS_USB;

uidev.id.vendor = 0x1;

uidev.id.product = 0x1;

uidev.id.version = 1;

uidev.absmin[ABS_X]=0;

uidev.absmax[ABS_X]=1023;

uidev.absfuzz[ABS_X]=0;

uidev.absflat[ABS_X ]=0;

uidev.absmin[ABS_Y]=0;

uidev.absmax[ABS_Y]=767;

uidev.absfuzz[ABS_Y]=0;

uidev.absflat[ABS_Y ]=0;

if(write(fd,&uidev,sizeof(uidev)) < 0)

die("error: write0");

if(ioctl(fd,UI_DEV_CREATE) < 0)

die("error: ioctl");

sleep(2);

while(1)

{

printf("\nEnter the absoulte x(0-1023) and y(0-767) co-ordinates:");

scanf("%d %d",&x,&y);

memset(&ev,sizeof(struct input_event));

gettimeofday(&ev.time,NULL);

ev.type = EV_ABS;

ev.code = ABS_X;

ev.value = x;

if(write(fd,&ev,sizeof(struct input_event)) < 0)

die("error: write1");

memset(&ev,sizeof(struct input_event));

ev.type = EV_SYN;

if(write(fd,sizeof(struct input_event)) < 0)

die("error: write4");

memset(&ev,sizeof(struct input_event));

ev.type = EV_ABS;

ev.code = ABS_Y;

ev.value = y;

if(write(fd,sizeof(struct input_event)) < 0)

die("error: write2");

memset(&ev,sizeof(struct input_event)) < 0)

die("error: write3");

usleep(15000);

printf("\nWritten x:%d y:%d to uinput.Press CTRL-C to quit:",x,y);

}

if(ioctl(fd,UI_DEV_DESTROY) < 0)

die("error: cannot destroy uinput device\n");

close(fd);

return 0;

}

该程序似乎通过uinput将我输入的绝对坐标发送到内核的输入核心.

在启用evbug之后,我在dmesg上验证了这一点.但我的鼠标指针不会在屏幕上移动.我想知道我搞砸了什么.

也许EV_ABS与光标无关？我想知道因为使用EV_REL移动光标可以正常工作,如this tutorial所述.

样品运行：

ravi@linux-lxaf:~/workspace/driver> sudo ./a.out

Enter the absoulte x(0-1023) and y(0-767) co-ordinates:100 200

Written x:100 y:200 to uinput.Press CTRL-C to quit:

Enter the absoulte x(0-1023) and y(0-767) co-ordinates:10 765

Written x:10 y:765 to uinput.Press CTRL-C to quit:

Enter the absoulte x(0-1023) and y(0-767) co-ordinates:^C

Caught SIGINT

Destroyed uinput_user_dev

Dmesg输出：

ravi@linux-lxaf:~/workspace/driver> dmesg |grep input16

[ 4750.660420] input: uinput-sample as /devices/virtual/input/input16

[ 4750.660594] evbug.c: Connected device: input16 (uinput-sample at unknown)

[ 4761.389036] evbug.c: Event. Dev: input16,Type: 3,Code: 0,Value: 100

[ 4761.389047] evbug.c: Event. Dev: input16,Type: 0,Value: 0

[ 4761.389053] evbug.c: Event. Dev: input16,Code: 1,Value: 200

[ 4761.389058] evbug.c: Event. Dev: input16,Value: 0

[ 4776.893126] evbug.c: Event. Dev: input16,Value: 10

[ 4776.893138] evbug.c: Event. Dev: input16,Value: 0

[ 4776.893144] evbug.c: Event. Dev: input16,Value: 765

[ 4776.893148] evbug.c: Event. Dev: input16,Value: 0

[ 4778.729711] evbug.c: Event. Dev: input16,Value: 1

[ 4778.745506] evbug.c: Disconnected device: input16