linux在用户程序中如何向操作系统发送按键事件

 转自：http://blog.csdn.net/xiangpengmeng/article/details/6396589

 考虑到很多人也可能都需要这些类似的功能， 尤其是搞嵌入式的， 我解决这个问题的思路也是从android系统中借鉴的，这个功能需要首先在内核中添加uinput模块， 大家也可以将这个模块直接编译进内核里面， 编译内核大家都熟悉， 我就不在说了， 都是整天配置编译的人啊。。。

 

下面两个文件直接取自我们一个使用手机远程控制系统， 下面是代码， 代码中已经有了注释， 不在解释了， 希望以上代码会对你有所帮助。

/**
 * @file  The file is using for (>>> function<<<)
 * @author imxiangpeng
 * @time  
 *
 * Copyright (C) [e-mail], Inc. All Rights Reserved.
 * Written by [e-mail]
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#ifndef RCBOARDMOUSE_H
#define RCBOARDMOUSE_H
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/input.h>
#include <linux/uinput.h>
#include <sys/time.h>
#include <unistd.h>
#include <errno.h>
static void kbdms_open_dev();
static int kbdms_init_dev(char *dev);
extern void kbdms_close_dev(void); /* you can call the function explicitly if you no need the function anymore*/
/* only the following functions which you can called, we initialise the device when you call the following function firstly */
/* key_code: referce to linux/input.h
   is_pressed_or_release: 1 if the key is pressed , 0 :release
   注意按键有按下，就必然会有释放，如果没有释放，再次调用按下函数是没有反映的
*/
extern void kbdms_send_button_event(unsigned short key_code, int is_pressed_or_release);
/* is_rel:1--relative move, else--absolutely
   if you want to send left or right mouse button , please call kbdms_send_button_event
*/
//extern void kbdms_send_mouse_move_events(unsigned short is_rel, unsigned short pos_x, unsigned short pos_y);
extern void kbdms_send_mouse_move_events(unsigned short is_rel, short pos_x, short pos_y);
extern void kbdms_send_wheel_events(short wheel_value);
#endif  /* RCBOARDMOUSE_H */

 

/**
 * @file  The file is using for (>>> function<<<)
 * @author imxiangpeng
 * @time  
 *
 * Copyright (C) [e-mail], Inc. All Rights Reserved.
 * Written by [e-mail]
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
 
#include "rcboardmouse.h"
static int uinput_fd = -1;
static struct uinput_user_dev uinput;
static struct input_event event;
static void kbdms_open_dev(){
  int ret = -1;
  ret = kbdms_init_dev("/dev/uinput");
  if(ret < 0){
    ret = kbdms_init_dev("/dev/input/uinput");
    if(ret < 0){
      printf("call kbdms_open_dev failure/n");
      return;
    }
  }
}
static int kbdms_init_dev(char *dev){
  int i = 0;
  if(dev == NULL){
    printf("The device is null/n");
    return -1;
  }
  uinput_fd = open(dev, O_WRONLY | O_NDELAY);
  if(uinput_fd < 0){
    perror("open uinput device failure:");
    return -1;
  }
  memset(&uinput, 0, sizeof(uinput));
  strncpy(uinput.name,"xiangpeng's virtual device",UINPUT_MAX_NAME_SIZE);
  uinput.id.version = 4;
  uinput.id.bustype = BUS_USB;
  ioctl(uinput_fd, UI_SET_EVBIT, EV_KEY);
  ioctl(uinput_fd, UI_SET_EVBIT, EV_REL);
  ioctl(uinput_fd, UI_SET_RELBIT, REL_X);
  ioctl(uinput_fd, UI_SET_RELBIT, REL_Y);
  ioctl(uinput_fd, UI_SET_RELBIT, REL_WHEEL);
  
  for(i = 0; i < 256; i++){
    ioctl(uinput_fd, UI_SET_KEYBIT, i);
  } /* end for */
  ioctl(uinput_fd, UI_SET_KEYBIT, BTN_MOUSE);
  ioctl(uinput_fd, UI_SET_KEYBIT, BTN_TOUCH);
  ioctl(uinput_fd, UI_SET_KEYBIT, BTN_LEFT);
  ioctl(uinput_fd, UI_SET_KEYBIT, BTN_MIDDLE);
  ioctl(uinput_fd, UI_SET_KEYBIT, BTN_RIGHT);
  ioctl(uinput_fd, UI_SET_KEYBIT, BTN_FORWARD);
  ioctl(uinput_fd, UI_SET_KEYBIT, BTN_BACK);
  /* Create input device into input sub-system */
  write(uinput_fd, &uinput, sizeof(uinput));
  if(ioctl(uinput_fd, UI_DEV_CREATE)){
    perror("create uinput device");
    return -1;
  }
  return 0;                     /* success */
  
} /* end init_uinput_dev function */
/* is_rel:1--relative move, else--absolutely
   which_button_pressed: 0--no button press, 1--left button press, 2--right button press 3--middle button press
   
 */
void kbdms_send_mouse_move_events(unsigned short is_rel, short pos_x, short pos_y){
  if(uinput_fd <= 0){
    
    printf("RC : %s please call dbdms_init_dev first/n",__FUNCTION__);
    kbdms_open_dev();
    if(uinput_fd <= 0)
      return;
  }
  /* Move pointer to (0,0) location */
  memset(&event, 0, sizeof(event));
  gettimeofday(&event.time, NULL);
  event.type = (is_rel == 1)?EV_REL:EV_ABS;
  event.code = (is_rel == 1)?REL_X:ABS_X;
  event.value = pos_x;
  write(uinput_fd, &event, sizeof(event));  
  event.type = EV_SYN;
  event.code = SYN_REPORT;
  event.value = 0;
  write(uinput_fd, &event, sizeof(event));
  memset(&event, 0, sizeof(event));
  gettimeofday(&event.time, NULL);
  event.type = (is_rel == 1)?EV_REL:EV_ABS;
  event.code = (is_rel == 1)?REL_Y:ABS_Y;
  event.value = pos_y;
  write(uinput_fd, &event, sizeof(event));
  /* 鼠标点击事件我们也通过 kbdms_send_button_event 来发送*/
  
} /* end send_click_events function */
/* key_code: referce to linux/input.h
   is_pressed_or_release: 1 if the key is pressed , 0 :release
 */
void kbdms_send_button_event(unsigned short key_code, int is_pressed_or_release){
  
  if(uinput_fd <= 0){
    printf("RC : %s please call dbdms_init_dev first/n",__FUNCTION__);
    kbdms_open_dev();
    if(uinput_fd <= 0)
      return;
  }
  /* report button click --press event */
  
  memset(&event, 0, sizeof(event));
  gettimeofday(&event.time, NULL);
  event.type = EV_KEY;
  event.code = key_code;
  event.value = is_pressed_or_release;
  write(uinput_fd, &event, sizeof(event));
  event.type = EV_SYN;
  event.code = SYN_REPORT;
  event.value = 0;
  write(uinput_fd, &event, sizeof(event));
  
}
void kbdms_send_wheel_events(short wheel_value){
  if(uinput_fd <= 0){
    printf("RC : %s please call dbdms_init_dev first/n",__FUNCTION__);
    kbdms_open_dev();    
    if(uinput_fd <= 0)
      return;
   
  }
  /* Move pointer to (0,0) location */
  memset(&event, 0, sizeof(event));
  gettimeofday(&event.time, NULL);
  event.type = EV_REL;
  event.code = REL_WHEEL;
  event.value = wheel_value;
  write(uinput_fd, &event, sizeof(event));  
  event.type = EV_SYN;
  event.code = SYN_REPORT;
  event.value = 0;
  write(uinput_fd, &event, sizeof(event));
  
} /* end send_click_events function */
void kbdms_close_dev(void){
  if(uinput_fd > 0){
    ioctl(uinput_fd, UI_DEV_DESTROY);
    close(uinput_fd);
  }
}
#if 0                           /* using for test all the functions */
int main(int argc, char **argv){
  if(argc <2){
    printf("Please specified the uinput device path/n");
    return -1;
  }
  printf("The device is :%s/n",argv[1]);
  if(kbdms_init_dev(argv[1]) < 0){
    printf("Call init_uinput_dev failure/n");
    return -1;
  }
  
  while(1){
    printf("we will send a click and a button event/n");
    //send_click_events();
    kbdms_send_button_event(KEY_LEFT, 1);
    kbdms_send_button_event(KEY_LEFT, 0);
    sleep(3);
    kbdms_send_button_event(KEY_DOWN,1);
    kbdms_send_button_event(KEY_DOWN,0);
    sleep(2);
    kbdms_send_button_event(KEY_DOWN,1);
    kbdms_send_button_event(KEY_DOWN,0);
    sleep(2);
    printf("we will call kbdms_send_wheel_events/n");
    kbdms_send_wheel_events(10);
    printf("We will wheel back up/n");
    sleep(2);
    
    kbdms_send_wheel_events(-10);
  }
  kbdms_close_dev();
  return 0;
}
#endif

 希望以上代码会对你有所帮助， 如果有什么疑问也可以给我发邮件， 邮件地址在每个文件的头部

当然， 本人计算机都是自学的， 如果各位看着在编程风格和代码书写上如果有什么不足， 希望大家可以提出来