MAC上读出usb

原文链接
mac上使用qt平台开发，读串口的话有QSerialPortinfo、QSerialPort
但是mac上没有串口，只有usb口，与串口通信也是通过usb口。使用libusb库

一、安装libusb

正常源码编译安装即可。

二、libusb动态库加入QT项目

QT项目中新建文件夹lib。，将/usr/local/lib/libusb-1.0.0.dylib复制到lib/下。
将第一步解压出来的libusb-1.0.21/libusb/libusb.h拷贝到Qt项目中lib目录下。

项目中.pro文件，加入
LIBS +=\
-L$$PWD/lib/ -lusb-1.0.0

测试代码如下

getusbinfo.h

#ifndef GETUSBINFO#define GETUSBINFO#include <QString>#include <QObject>#include <QList>#include <QThread>#include <libusb.h>struct STUUSBDevices{    QString idProduct;    QString idVendor;    QString iManufacturer;    QString iSerialNumber;};class GetUsbInfo :  QThread{public:    GetUsbInfo(QObject *parent);    ~GetUsbInfo();    int initUsbDevices();    QString getVidPid(libusb_device **devs);    void showAllUsbDevices(QList<STUUSBDevices> lst);    void setRunStatus();    void run();    bool isStop;};#endif // GETUSBINFO

getusbinfo.cpp

#include "getusbinfo.h"#include <QThread>#include <QDebug>#include <QString>GetUsbInfo::GetUsbInfo(QObject *parent) :    QThread(parent),isStop(false){}GetUsbInfo::~GetUsbInfo(){    qDebug()<<"GetUsbInfo::~GetUsbInfo "<<endl;}int GetUsbInfo::initUsbDevices(){    libusb_device **devs;    int r;    ssize_t cnt;    r = libusb_init(NULL);    if (r < 0)        return r;    cnt = libusb_get_device_list(NULL, &devs);    if (cnt < 0)        return (int) cnt;    getVidPid(devs);    libusb_free_device_list(devs, 1);    libusb_exit(NULL);    return 0;}QString GetUsbInfo::getVidPid(libusb_device **devs){    libusb_device *dev;    int i = 0;    QList<STUUSBDevices> lstUsb;    while ((dev = devs[i++]) != NULL) {        struct libusb_device_descriptor desc;        int r = libusb_get_device_descriptor(dev, &desc);        if (r < 0) {            qDebug()<<"failed to get device descriptor"<<stderr;            return "";        }        printf("%04x:%04x (bus %d, device %d)\n",            desc.idVendor, desc.idProduct,            libusb_get_bus_number(dev), libusb_get_device_address(dev));        STUUSBDevices stu;        stu.idProduct = QString::number(desc.idProduct);        stu.idVendor = QString::number(desc.idVendor);        stu.iManufacturer = QString::number(desc.iManufacturer);        stu.iSerialNumber = QString::number(desc.iSerialNumber);        lstUsb.append(stu);    }    showAllUsbDevices(lstUsb);    return QString(lstUsb[0].idProduct);}void GetUsbInfo::showAllUsbDevices(QList<STUUSBDevices> lst){    for(int i=0;i<lst.count();i++)    {        qDebug()<<"vid: "<<lst.at(i).idVendor<<"\n"               <<"pid:"<<lst.at(i).idProduct<<"\n"                <<"serNumber:"<<lst.at(i).iSerialNumber<<"\n"                  <<"Manufacturer:"<<lst.at(i).iManufacturer<<"\n";    }}void GetUsbInfo::setRunStatus(){    isStop = true;}void GetUsbInfo::run(){    qDebug()<<"GetUsbInfo::run() "<<endl;    while (!isStop)    {       initUsbDevices();       sleep(10);    }}

main.cpp

#include "mainwindow.h"#include <QApplication>#include "getusbinfo.h"#include <QLibrary>int main(int argc, char *argv[]){    QApplication a(argc, argv);    MainWindow w;    w.show();    QThread t;    GetUsbInfo info(&t);    info.initUsbDevices();    return a.exec();}