在ubuntu18.04下，通过编程向系统发送组合键

骑猪看日落 2022-12-23 07:15 102阅读 0赞

# 在ubuntu18.04下，通过编程向系统发送组合键 #

### 实现原理： ###

在ubuntu，模拟发送组合键，本文的实现方式，是通过写文件的方式，来模拟键盘事件。在/dev/目录下，有一个“uinput”字符设备文件，我们可以写此文件，来模拟键盘事件。

向“uinput”文件写一个按钮，则是单键按下，连续写多个按钮，则可以模拟组合键。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3JsNTI5MDE0_size_16_color_FFFFFF_t_70_pic_center]

### 源码： ###

#include <linux/input.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 sendCtrl_Alt_Del_Key()
    {
        
        int uinp_fd = open("/dev/uinput",O_RDWR);
        if (uinp_fd < 0){
        
            //qDebug()<<"unable to open /dev/uinput";
            return;
        }
        if(ioctl(uinp_fd ,UI_SET_EVBIT,EV_KEY)<0) //设置设备所支持的动作，#defineEV_KEY 0x01 // 按下键
        {
        
            //qDebug()<<"unable to set EV_KEY";
            return;
        }
        if(ioctl(uinp_fd ,UI_SET_EVBIT,EV_REP)<0) //设置设备所支持的动作，#defineEV_KEY 0x02 // 释放
        {
        
            //qDebug()<<"unable to set EV_REP";
            return;
        }
    
        for(int i = 0; i < 256; i++){
          //---------------------???????
    
            ioctl(uinp_fd , UI_SET_KEYBIT, i);
        }
    
        //创建设备并写入至input子系统
        struct  uinput_user_dev  uinput;
        memset(&uinput,0,sizeof(uinput));
        uinput.id.version = 4;
        uinput.id.bustype = BUS_USB;
        strncpy(uinput.name,"virtual device a",UINPUT_MAX_NAME_SIZE);
        int ret = write( uinp_fd , &uinput, sizeof(uinput) );
        if(ret<0)
        {
        
            //qDebug()<<"unable to write(uinp_fd , &uinput, sizeof(uinput)";
            return;
        }
        int err = ioctl(uinp_fd, UI_DEV_CREATE);
        if(err < 0)
        {
        
            //qDebug()<<"unable to  creat device";
            return;
        }
        //construct input_event and send it
        struct input_event event;
        unsigned int key_code = KEY_LEFTCTRL;  //键值
        usleep(100000);//importan
        //unsigned int key_code = KEY_CAPSLOCK;
        event.type = EV_KEY;
        event.code = key_code;
        event.value = 1; //1 means pressed signal
        gettimeofday(&event.time, NULL);
        if (write(uinp_fd, &event, sizeof(event)) < 0) {
        
            //qDebug()<<"unable to  write key event";
            return;
        }
        event.code  = KEY_LEFTALT;
        if (write(uinp_fd, &event, sizeof(event)) < 0) {
        
            //qDebug()<<"unable to  write key event";
            return;
        }
    
        event.code  = KEY_DELETE;
        if (write(uinp_fd, &event, sizeof(event)) < 0) {
        
            //qDebug()<<"unable to  write key event";
            return;
        }
        gettimeofday(&event.time, NULL);
        event.value = 0;
    
        // send sync signal///
        event.type = EV_SYN;
        event.code = SYN_REPORT;
        event.value = 0;
        gettimeofday(&event.time, NULL);
        if( write(uinp_fd, &event, sizeof(event))<0 )//发送同步信号
        {
        
            //qDebug()<<"unable to  write sync event";
            return;
        }
        close(uinp_fd);
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3JsNTI5MDE0_size_16_color_FFFFFF_t_70_pic_center]: /images/20221120/2f8d0ba8e1a248d587b240d820ad61fe.png