Qt 获取usb设备信息 hacking

/**************************************************************************
*                       Qt 获取usb设备信息 hacking
* 声明：
*     本文主要是为了查看之前朋友留下的Qt获取usb设备信息软件运作机制。
*
*                                       2015-12-31 深圳 南山平山村 曾剑锋
*************************************************************************/

一、usbfs 文件系统
需要在Linux内核中打开usbfs选项:
───────────────────────────────────────────────────────────────────────────
┌────────────────────────────── USB support ──────────────────────────────┐
│  Arrow keys navigate the menu.  <Enter> selects submenus --->.          │
│  Highlighted letters are hotkeys.  Pressing <Y> includes, <N> excludes, │
│  <M> modularizes features.  Press <Esc><Esc> to exit, <?> for Help, </> │
│  for Search.  Legend: [*] built-in  [ ] excluded  <M> module  < >       │
│ ┌─────────────────────────────────────────────────────────────────────┐ │
│ │    --- USB support                                                  │ │
│ │    <*>   Support for Host-side USB                                  │ │
│ │    [*]     USB verbose debug messages                               │ │
│ │    [*]     USB announce new devices                                 │ │
│ │            *** Miscellaneous USB options ***                        │ │
│ │    [*]     USB device filesystem (DEPRECATED)    <----------- these │ │
│ │    [*]     USB device class-devices (DEPRECATED)                    │ │
│ │    [ ]     Dynamic USB minor allocation                             │ │
│ │    [*]     USB runtime power management (autosuspend) and wakeup    │ │
│ │    [*]       OTG support                                            │ │
│ └────v(+)─────────────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────────────────────┤
│                    <Select>    < Exit >    < Help >                     │
└─────────────────────────────────────────────────────────────────────────┘

二、cat mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}

MainWindow::~MainWindow()
{
delete ui;
}

void MainWindow::on_pushButton_clicked()
{
if(myprocess)
delete myprocess;

myprocess = new QProcess(this);
connect(myprocess, SIGNAL(readyReadStandardOutput()),this, SLOT(result()));
connect(myprocess, SIGNAL(readyReadStandardError()),this, SLOT(result()));

/**
* If you say Y here (and to "/proc file system support" in the "File
* systems" section, above), you will get a file /proc/bus/usb/devices
* which lists the devices currently connected to your USB bus or
* busses, and for every connected device a file named
* "/proc/bus/usb/xxx/yyy", where xxx is the bus number and yyy the
* device number; the latter files can be used by user space programs
* to talk directly to the device. These files are "virtual", meaning
* they are generated on the fly and not stored on the hard drive.
*
* You may need to mount the usbfs file system to see the files, use
* mount -t usbfs none /proc/bus/usb
*
* For the format of the various /proc/bus/usb/ files, please read
* <file:Documentation/usb/proc_usb_info.txt>.
*/
myprocess->start("cat /proc/bus/usb/devices");
ui->result->clear();
}
void MainWindow::result()
{
QString abc = myprocess->readAllStandardOutput();
ui->result->append(abc.trimmed());
QString efg = myprocess->readAllStandardError();
if(efg.length()>1)ui->result->append(efg.trimmed());
}