（转）linux如何获取鼠标相对位置信息

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#include <stdio.h>

#include <stdlib.h>

#include <linux/input.h>

#include <fcntl.h>

#include <sys/time.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

int main(int argc,char **argv)

{

int fd, retval;

char buf[6];

fd_set readfds;

struct timeval tv;

// 打开鼠标设备

fd = open( "/dev/input/mice", O_RDONLY );

// 判断是否打开成功

if(fd<0) {

printf("Failed to open \"/dev/input/mice\".\n");

exit(1);

} else {

printf("open \"/dev/input/mice\" successfuly.\n");

}

while(1) {

// 设置最长等待时间

tv.tv_sec = 5;

tv.tv_usec = 0;

FD_ZERO( &readfds );

FD_SET( fd, &readfds );

retval = select( fd+1, &readfds, NULL, NULL, &tv );

if(retval==0) {

printf( "Time out!\n" );

}

if(FD_ISSET(fd,&readfds)) {

// 读取鼠标设备中的数据

if(read(fd, buf, 6) <= 0) {

continue;

}

// 打印出从鼠标设备中读取到的数据

printf("Button type = %d, X = %d, Y = %d, Z = %d\n", (buf[0] & 0x07), buf[1], buf[2], buf[3]);

}

}

close(fd);

return 0;

}