Problem including libusb doesn't recognize the functions or variables of libusb

[aurquiel]

I am tried to compile a file with the header a his source file, both of them have the line to include the libusb library on GNU/Linux OS with this line

#include <libusb-1.0/libusb.h>

cyusb.c

/*******************************************************************************\
 * Program Name		:	libcyusb.c					*
 * Author		:	V. Radhakrishnan ( rk@atr-labs.com )		*
 * License		:	GPL Ver 2.0					*
 * Copyright		:	Cypress Semiconductors Inc. / ATR-LABS		*
 * Date written		:	March 12, 2012					*
 * Modification Notes	:							*
 * 										*
 * This program is the main library for all cyusb applications to use.		*
 * This is a thin wrapper around libusb						*
\*******************************************************************************/

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>

#include <libusb-1.0/libusb.h>
#include "cyusb.h"

/* Maximum length of a string read from the Configuration file (/etc/cyusb.conf) for the library. */
#define MAX_CFG_LINE_LENGTH                     (120)

static struct cydev cydev[MAXDEVICES];
static int nid;		/* Number of Interesting Devices	*/

struct VPD {
    unsigned short	vid;
    unsigned short	pid;
    char		desc[MAX_STR_LEN];
};

static struct VPD vpd[MAX_ID_PAIRS];

static int maxdevices;
static int numdev;
static libusb_device **list;
static unsigned int checksum = 0;

char pidfile[256];
char logfile[256];
int logfd;
int pidfd;

static int isempty(char *buf, int L)
{
    int flag = 1;
    int i;

    if ( L == 0 ) return 1;

    for (i = 0; i < L; ++i ) {
        if ( (buf[i] == ' ') || ( buf[i] == '\t' ) )
         continue;
        else {
         flag = 0;
         break;
        }
    }
    return flag;
}

static void parse_configfile(void)
{
    FILE *inp;
    char buf[MAX_CFG_LINE_LENGTH];
    char *cp1, *cp2, *cp3;
    int i;

    inp = fopen("/etc/cyusb.conf", "r");
        if (inp == NULL)
            return;

    memset(buf,'\0',MAX_CFG_LINE_LENGTH);
    while ( fgets(buf,MAX_CFG_LINE_LENGTH,inp) ) {
        if ( buf[0] == '#' ) 			/* Any line starting with a # is a comment 	*/
           continue;
        if ( buf[0] == '\n' )
           continue;
        if ( isempty(buf,strlen(buf)) )		/* Any blank line is also ignored		*/
           continue;

        cp1 = strtok(buf," =\t\n");
        if ( !strcmp(cp1,"LogFile") ) {
           cp2 = strtok(NULL," \t\n");
           strcpy(logfile,cp2);
        }
        else if ( !strcmp(cp1,"PIDFile") ) {
            cp2 = strtok(NULL," \t\n");
            strcpy(pidfile,cp2);
        }
        else if ( !strcmp(cp1,"<VPD>") ) {
            while ( fgets(buf,MAX_CFG_LINE_LENGTH,inp) ) {
                if ( buf[0] == '#' ) 		/* Any line starting with a # is a comment 	*/
                   continue;
                if ( buf[0] == '\n' )
                   continue;
                if ( isempty(buf,strlen(buf)) )	/* Any blank line is also ignored		*/
                   continue;
                if ( maxdevices == (MAX_ID_PAIRS - 1) )
                   continue;
                cp1 = strtok(buf," \t\n");
                if ( !strcmp(cp1,"</VPD>") )
                   break;
                cp2 = strtok(NULL, " \t");
                cp3 = strtok(NULL, " \t\n");

                vpd[maxdevices].vid = strtol(cp1,NULL,16);
                vpd[maxdevices].pid = strtol(cp2,NULL,16);
                strncpy(vpd[maxdevices].desc,cp3,MAX_STR_LEN);
                                vpd[maxdevices].desc[MAX_STR_LEN - 1] = '\0';   /* Make sure of NULL-termination. */

                ++maxdevices;
            }
        }
        else {
             printf("Error in config file /etc/cyusb.conf: %s \n",buf);
             exit(1);
        }
    }

    fclose(inp);
}

static int device_is_of_interest(cyusb_device *d)
{
    int i;
    int found = 0;
    struct libusb_device_descriptor desc;
    int vid;
    int pid;

    libusb_get_device_descriptor(d, &desc);
    vid = desc.idProduct;
    pid = desc.idProduct;

    for ( i = 0; i < maxdevices; ++i ) {
        if ( (vpd[i].vid == desc.idVendor) && (vpd[i].pid == desc.idProduct) ) {
            found = 1;
        break;
        }
    }
    return found;
}

unsigned short cyusb_getvendor(cyusb_handle *h)
{
    struct libusb_device_descriptor d;
    cyusb_get_device_descriptor(h, &d);
    return d.idVendor;
}

unsigned short cyusb_getproduct(cyusb_handle *h)
{
    struct libusb_device_descriptor d;
    cyusb_get_device_descriptor(h, &d);
    return d.idProduct;
}

static int renumerate(void)
{
    cyusb_device *dev = NULL;
    cyusb_handle *handle = NULL;
    int found = 0;
    int i;
    int r;

    numdev = libusb_get_device_list(NULL, &list);
    if ( numdev < 0 ) {
       printf("Library: Error in enumerating devices...\n");
       return -4;
    }

    nid = 0;

    for ( i = 0; i < numdev; ++i ) {
        cyusb_device *tdev = list[i];
        if ( device_is_of_interest(tdev) ) {
           cydev[nid].dev = tdev;
           r = libusb_open(tdev, &cydev[nid].handle);
           if ( r ) {
              printf("Error in opening device\n");
              return -5;
           }
           else handle = cydev[nid].handle;
           cydev[nid].vid     = cyusb_getvendor(handle);
           cydev[nid].pid     = cyusb_getproduct(handle);
           cydev[nid].is_open = 1;
           cydev[nid].busnum  = cyusb_get_busnumber(handle);
           cydev[nid].devaddr = cyusb_get_devaddr(handle);
           ++nid;
        }
    }
    return nid;
}

int cyusb_open(unsigned short vid, unsigned short pid)
{
    int r;
    cyusb_handle *h = NULL;

    r = libusb_init(NULL);
    if (r) {
          printf("Error in initializing libusb library...\n");
          return -1;
    }
    h = libusb_open_device_with_vid_pid(NULL, vid, pid);
    if ( !h ) {
       printf("Device not found\n");
       return -2;
    }
    cydev[0].dev     = libusb_get_device(h);
    cydev[0].handle  = h;
    cydev[nid].vid     = cyusb_getvendor(h);
    cydev[nid].pid     = cyusb_getproduct(h);
    cydev[nid].is_open = 1;
    cydev[nid].busnum  = cyusb_get_busnumber(h);
    cydev[nid].devaddr = cyusb_get_devaddr(h);
    nid = 1;
    return 1;
}

void cyusb_error(int err)
{	if ( err == -1 )
       fprintf(stderr, "Input/output error\n");
    else if ( err == -2 )
        fprintf(stderr, "Invalid parameter\n");
    else if ( err == -3 )
        fprintf(stderr, "Access denied (insufficient permissions)\n");
    else if ( err == -4 )
        fprintf(stderr, "No such device. Disconnected...?\n");
    else if ( err == -5 )
        fprintf(stderr, "Entity not found\n");
    else if ( err == -6 )
        fprintf(stderr, "Resource busy\n");
    else if ( err == -7 )
        fprintf(stderr, "Operation timed out\n");
    else if ( err == -8 )
        fprintf(stderr, "Overflow\n");
    else if ( err == -9 )
        fprintf(stderr, "Pipe error\n");
    else if ( err == -10 )
        fprintf(stderr, "System call interrupted, ( due to signal ? )\n");
    else if ( err == -11 )
        fprintf(stderr, "Insufficient memory\n");
    else if ( err == 12 )
        fprintf(stderr, "Operation not supported/implemented\n");
    else fprintf(stderr, "Unknown internal error\n");
}


cyusb_handle * cyusb_gethandle(int index)
{
    return cydev[index].handle;
}

void cyusb_close(void)
{
    int i;

    for ( i = 0; i < nid; ++i ) {
        libusb_close(cydev[i].handle);
    }
    libusb_free_device_list(list, 1);
    libusb_exit(NULL);
}

int cyusb_get_busnumber(cyusb_handle *h)
{
    cyusb_device *tdev = libusb_get_device(h);
    return libusb_get_bus_number( tdev );
}

int cyusb_get_devaddr(cyusb_handle *h)
{
    cyusb_device *tdev = libusb_get_device(h);
    return libusb_get_device_address( tdev );
}

int cyusb_get_max_packet_size(cyusb_handle *h, unsigned char endpoint)
{
    cyusb_device *tdev = libusb_get_device(h);
    return ( libusb_get_max_packet_size(tdev, endpoint) );
}

int cyusb_get_max_iso_packet_size(cyusb_handle *h, unsigned char endpoint)
{
    cyusb_device *tdev = libusb_get_device(h);
    return ( libusb_get_max_iso_packet_size(tdev, endpoint) );
}

int cyusb_get_configuration(cyusb_handle *h, int *config)
{
    return ( libusb_get_configuration(h, config) );
}

int cyusb_set_configuration(cyusb_handle *h, int config)
{
    return ( libusb_set_configuration(h, config) );
}

int cyusb_claim_interface(cyusb_handle *h, int interface)
{
    return ( libusb_claim_interface(h, interface) );
}

int cyusb_release_interface(cyusb_handle *h, int interface)
{
    return ( libusb_release_interface(h, interface) );
}

int cyusb_set_interface_alt_setting(cyusb_handle *h, int interface, int altsetting)
{
    return ( libusb_set_interface_alt_setting(h, interface, altsetting) );
}

int cyusb_clear_halt(cyusb_handle *h, unsigned char endpoint)
{
    return ( libusb_clear_halt(h, endpoint) );
}

int cyusb_reset_device(cyusb_handle *h)
{
    return ( libusb_reset_device(h) );
}

int cyusb_kernel_driver_active(cyusb_handle *h, int interface)
{
    return ( libusb_kernel_driver_active(h, interface) );
}

int cyusb_detach_kernel_driver(cyusb_handle *h, int interface)
{
    return ( libusb_detach_kernel_driver(h, interface) );
}

int cyusb_attach_kernel_driver(cyusb_handle *h, int interface)
{
    return ( libusb_attach_kernel_driver(h, interface) );
}

int cyusb_get_device_descriptor(cyusb_handle *h, struct libusb_device_descriptor *desc)
{
    cyusb_device *tdev = libusb_get_device(h);
    return ( libusb_get_device_descriptor(tdev, desc ) );
}

int cyusb_get_active_config_descriptor(cyusb_handle *h, struct libusb_config_descriptor **config)
{
    cyusb_device *tdev = libusb_get_device(h);
    return ( libusb_get_active_config_descriptor(tdev, config) );
}

int cyusb_get_config_descriptor(cyusb_handle *h, unsigned char config_index, struct libusb_config_descriptor **config)
{
    cyusb_device *tdev = libusb_get_device(h);
    return ( libusb_get_config_descriptor(tdev, config_index, config) );
}

int cyusb_get_config_descriptor_by_value(cyusb_handle *h, unsigned char bConfigurationValue,
                                    struct usb_config_descriptor **config)
{
    cyusb_device *tdev = libusb_get_device(h);
    return ( libusb_get_config_descriptor_by_value(tdev, bConfigurationValue,
                    (struct libusb_config_descriptor **)config) );
}

void cyusb_free_config_descriptor(struct libusb_config_descriptor *config)
{
    libusb_free_config_descriptor( (libusb_config_descriptor *)config );
}

int cyusb_get_string_descriptor_ascii(cyusb_handle *h, unsigned char index, unsigned char *data,  int length)
{
    cyusb_device *tdev = libusb_get_device(h);
    return ( libusb_get_string_descriptor_ascii(h, index, data, length) );
}

int cyusb_get_descriptor(cyusb_handle *h, unsigned char desc_type, unsigned char desc_index, unsigned char *data,
        int len)
{
    return ( libusb_get_descriptor(h, desc_type, desc_index, data, len) );
}

int cyusb_get_string_descriptor(cyusb_handle *h, unsigned char desc_index, unsigned short langid,
                                unsigned char *data, int len)
{
    return ( libusb_get_string_descriptor(h, desc_index, langid, data, len) );
}

int cyusb_control_transfer(cyusb_handle *h, unsigned char bmRequestType, unsigned char bRequest,
        unsigned short wValue, unsigned short wIndex, unsigned char *data, unsigned short wLength,
        unsigned int timeout)
{
    return ( libusb_control_transfer(h, bmRequestType, bRequest, wValue, wIndex, data, wLength, timeout) );
}

int cyusb_control_read (cyusb_handle *h, unsigned char bmRequestType, unsigned char bRequest,
        unsigned short wValue, unsigned short wIndex, unsigned char *data, unsigned short wLength,
        unsigned int timeout)
{
    /* Set the direction bit to indicate a read transfer. */
    return ( libusb_control_transfer(h, bmRequestType | 0x80, bRequest, wValue, wIndex, data, wLength, timeout) );
}

int cyusb_control_write (cyusb_handle *h, unsigned char bmRequestType, unsigned char bRequest,
        unsigned short wValue, unsigned short wIndex, unsigned char *data, unsigned short wLength,
        unsigned int timeout)
{
    /* Clear the direction bit to indicate a write transfer. */
    return ( libusb_control_transfer(h, bmRequestType & 0x7F, bRequest, wValue, wIndex, data, wLength, timeout) );
}

int cyusb_bulk_transfer(cyusb_handle *h, unsigned char endpoint, unsigned char *data, int length,
                int *transferred, int timeout)
{
    return ( libusb_bulk_transfer(h, endpoint, data, length, transferred, timeout) );
}

int cyusb_interrupt_transfer(cyusb_handle *h, unsigned char endpoint, unsigned char *data, int length,
                int *transferred, unsigned int timeout)
{
    return ( libusb_interrupt_transfer(h, endpoint, data, length, transferred, timeout) );
}


static void control_transfer(cyusb_handle *h, unsigned int address, unsigned char *dbuf, int len)
{
    int j;
    int r;
    int b;
    unsigned int *pint;
    int index;

    int balance = len;
    pint = (unsigned int *)dbuf;

    index = 0;
    while ( balance > 0 ) {
          if ( balance > 4096 )
         b = 4096;
          else b = balance;
          r = cyusb_control_transfer(h, 0x40, 0xA0, ( address & 0x0000ffff ), address >> 16, &dbuf[index], b, 1000);
          if ( r != b ) {
           printf("Error in control_transfer\n");
          }
          address += b ;
          balance -= b;
          index += b;
    }
    for ( j = 0; j < len/4; ++j )
        checksum += pint[j];
}

I am getting this error

/home/pasante/Escritorio/simple-player/src/cyusb.c:372: error: ‘libusb_config_descriptor’ undeclared (first use in this function)
libusb_free_config_descriptor( (libusb_config_descriptor *)config );
^~~~~~~~~~~~~~~~~~~~~~~~
libusb_config_descriptor is not declared

if i eliminate the function where that variable appears, any variable or function of libusb are recognized

[mrjj]

Hi
Can you show your .pro file ?

Its unclear how you LINK to the actual lib.

http://doc.qt.io/qtcreator/creator-project-qmake-libraries.html

[dheerendra]

Looks like this question is nothing to do with Qt. But still where is the structure libusb_config_descriptor defined ? This structure may not be available in your library. Please check it.

[aurquiel]

@mrjj said in Problem including libusb doesn't recognize the functions or variables of libusb:

Hi
Can you show your .pro file ?

Its unclear how you LINK to the actual lib.

http://doc.qt.io/qtcreator/creator-project-qmake-libraries.html

.pro

#
# VLC-Qt Simple Player
# Copyright (C) 2015 Tadej Novak <tadej@tano.si>
#

TARGET      = simple-player
TEMPLATE    = app
CONFIG 	   += c++11

QT         += widgets

SOURCES    += main.cpp \
    SimplePlayer.cpp \
    EqualizerDialog.cpp \
    connection.cpp \
    cyusb.c

HEADERS    += SimplePlayer.h \
    EqualizerDialog.h \
    connection.h \
    cyusb.h

FORMS      += SimplePlayer.ui \
    EqualizerDialog.ui

LIBS       += -lVLCQtCore -lVLCQtWidgets 


# Edit below for custom library location
LIBS       += -L/Users/tadej/workspace/tanoprojects/install/vlc-qt/lib -lVLCQtCore -lVLCQtWidgets 
INCLUDEPATH += /Users/tadej/workspace/tanoprojects/install/vlc-qt/include 

RESOURCES += \
    icons.qrc

I am doing some search about added the path to the .pro file, here it's where libusb are located in my computer, but i am not sure how to added to the .pro i was only able to find the header here /usr/include/libusb-1.0/libusb.h and not the lib

pasante@pasante-MN-50:~$ locate libusb
/lib/firmware/carl9170fw/extra/libusb-zeropacket.diff
/lib/x86_64-linux-gnu/libusb-1.0.so.0
/lib/x86_64-linux-gnu/libusb-1.0.so.0.1.0
/opt/Qt5.8.0/5.8/Src/coin/provisioning/qtci-linux-RHEL-6.6-x86_64/libusb.sh
/opt/Qt5.8.0/5.8/Src/coin/provisioning/qtci-linux-Ubuntu-14.04-x86_64/libusb.sh
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/build/linux/unbundle/libusb.gyp
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/BUILD.gn
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/OWNERS
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/README.chromium
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/assign-endpoints-checks.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/composite-hid-close.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/darwin-sigfpe.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/libusb.gyp
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/linux-udev.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/open-fd.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/upstream-tick147.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/windows-build.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/AUTHORS
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/COPYING
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/config.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/core.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/descriptor.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/hotplug.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/hotplug.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/interrupt.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/interrupt.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/io.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/libusb.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/libusbi.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/strerror.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/sync.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/version.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/version_nano.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/DEPS
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/darwin_usb.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/darwin_usb.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/linux_netlink.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/linux_udev.cc
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/linux_usbfs.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/linux_usbfs.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/openbsd_usb.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/poll_posix.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/poll_posix.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/poll_windows.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/poll_windows.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/threads_posix.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/threads_posix.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/threads_windows.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/threads_windows.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/wince_usb.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/wince_usb.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/windows_common.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/windows_usb.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/windows_usb.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc/config.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc/errno.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc/inttypes.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc/missing.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc/missing.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc/stdint.h
/opt/Qt5.8.0/Docs/Qt-5.8/qtwebengine/qtwebengine-3rdparty-libusbx.html
/usr/include/libusb-1.0
/usr/include/libusb-1.0/libusb.h
/usr/lib/x86_64-linux-gnu/libusb-1.0.a
/usr/lib/x86_64-linux-gnu/libusb-1.0.so
/usr/lib/x86_64-linux-gnu/libusbmuxd.so.4
/usr/lib/x86_64-linux-gnu/libusbmuxd.so.4.0.0
/usr/lib/x86_64-linux-gnu/pkgconfig/libusb-1.0.pc
/usr/share/doc/libusb-1.0-0
/usr/share/doc/libusb-1.0-0-dbg
/usr/share/doc/libusb-1.0-0-dev
/usr/share/doc/libusb-1.0-doc
/usr/share/doc/libusbmuxd4
/usr/share/doc/libusb-1.0-0/README
/usr/share/doc/libusb-1.0-0/changelog.Debian.gz
/usr/share/doc/libusb-1.0-0/copyright
/usr/share/doc/libusb-1.0-0-dbg/changelog.Debian.gz
/usr/share/doc/libusb-1.0-0-dbg/copyright
/usr/share/doc/libusb-1.0-0-dev/README
/usr/share/doc/libusb-1.0-0-dev/changelog.Debian.gz
/usr/share/doc/libusb-1.0-0-dev/copyright
/usr/share/doc/libusb-1.0-doc/PORTING
/usr/share/doc/libusb-1.0-doc/README
/usr/share/doc/libusb-1.0-doc/changelog.Debian.gz
/usr/share/doc/libusb-1.0-doc/copyright
/usr/share/doc/libusb-1.0-doc/html
/usr/share/doc/libusb-1.0-doc/html/annotated.html
/usr/share/doc/libusb-1.0-doc/html/api.html
/usr/share/doc/libusb-1.0-doc/html/arrowdown.png
/usr/share/doc/libusb-1.0-doc/html/arrowright.png
/usr/share/doc/libusb-1.0-doc/html/bc_s.png
/usr/share/doc/libusb-1.0-doc/html/bdwn.png
/usr/share/doc/libusb-1.0-doc/html/caveats.html
/usr/share/doc/libusb-1.0-doc/html/classes.html
/usr/share/doc/libusb-1.0-doc/html/closed.png
/usr/share/doc/libusb-1.0-doc/html/contexts.html
/usr/share/doc/libusb-1.0-doc/html/dir_6560186179ae86ab3fbed805e7cb86e4.html
/usr/share/doc/libusb-1.0-doc/html/doc.png
/usr/share/doc/libusb-1.0-doc/html/doxygen.css
/usr/share/doc/libusb-1.0-doc/html/doxygen.png
/usr/share/doc/libusb-1.0-doc/html/files.html
/usr/share/doc/libusb-1.0-doc/html/folderclosed.png
/usr/share/doc/libusb-1.0-doc/html/folderopen.png
/usr/share/doc/libusb-1.0-doc/html/functions.html
/usr/share/doc/libusb-1.0-doc/html/functions_vars.html
/usr/share/doc/libusb-1.0-doc/html/group__asyncio.html
/usr/share/doc/libusb-1.0-doc/html/group__desc.html
/usr/share/doc/libusb-1.0-doc/html/group__dev.html
/usr/share/doc/libusb-1.0-doc/html/group__hotplug.html
/usr/share/doc/libusb-1.0-doc/html/group__lib.html
/usr/share/doc/libusb-1.0-doc/html/group__misc.html
/usr/share/doc/libusb-1.0-doc/html/group__poll.html
/usr/share/doc/libusb-1.0-doc/html/group__syncio.html
/usr/share/doc/libusb-1.0-doc/html/hotplug.html
/usr/share/doc/libusb-1.0-doc/html/index.html
/usr/share/doc/libusb-1.0-doc/html/io.html
/usr/share/doc/libusb-1.0-doc/html/jquery.js
/usr/share/doc/libusb-1.0-doc/html/libusb_8h_source.html
/usr/share/doc/libusb-1.0-doc/html/modules.html
/usr/share/doc/libusb-1.0-doc/html/mtasync.html
/usr/share/doc/libusb-1.0-doc/html/nav_f.png
/usr/share/doc/libusb-1.0-doc/html/nav_g.png
/usr/share/doc/libusb-1.0-doc/html/nav_h.png
/usr/share/doc/libusb-1.0-doc/html/open.png
/usr/share/doc/libusb-1.0-doc/html/packetoverflow.html
/usr/share/doc/libusb-1.0-doc/html/pages.html
/usr/share/doc/libusb-1.0-doc/html/splitbar.png
/usr/share/doc/libusb-1.0-doc/html/structlibusb__bos__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__bos__dev__capability__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__config__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__container__id__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__control__setup.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__device__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__endpoint__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__interface.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__interface__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__iso__packet__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__pollfd.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__ss__endpoint__companion__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__ss__usb__device__capability__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__transfer.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__usb__2__0__extension__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__version.html
/usr/share/doc/libusb-1.0-doc/html/sync_off.png
/usr/share/doc/libusb-1.0-doc/html/sync_on.png
/usr/share/doc/libusb-1.0-doc/html/tab_a.png
/usr/share/doc/libusb-1.0-doc/html/tab_b.png
/usr/share/doc/libusb-1.0-doc/html/tab_h.png
/usr/share/doc/libusb-1.0-doc/html/tab_s.png
/usr/share/doc/libusb-1.0-doc/html/tabs.css
/usr/share/doc/libusb-1.0-doc/html/version_8h_source.html
/usr/share/doc/libusb-1.0-doc/html/version__nano_8h_source.html
/usr/share/doc/libusbmuxd4/changelog.Debian.gz
/usr/share/doc/libusbmuxd4/copyright
/usr/share/doc-base/libusb-1.0-doc
/usr/share/lintian/overrides/libusbmuxd4
/var/cache/apt/archives/libusb-1.0-0-dbg_2%3a1.0.20-1_amd64.deb
/var/cache/apt/archives/libusb-1.0-0-dev_2%3a1.0.20-1_amd64.deb
/var/cache/apt/archives/libusb-1.0-doc_2%3a1.0.20-1_all.deb
/var/lib/dpkg/info/libusb-1.0-0-dbg:amd64.list
/var/lib/dpkg/info/libusb-1.0-0-dbg:amd64.md5sums
/var/lib/dpkg/info/libusb-1.0-0-dev:amd64.list
/var/lib/dpkg/info/libusb-1.0-0-dev:amd64.md5sums
/var/lib/dpkg/info/libusb-1.0-0:amd64.list
/var/lib/dpkg/info/libusb-1.0-0:amd64.md5sums
/var/lib/dpkg/info/libusb-1.0-0:amd64.shlibs
/var/lib/dpkg/info/libusb-1.0-0:amd64.symbols
/var/lib/dpkg/info/libusb-1.0-0:amd64.triggers
/var/lib/dpkg/info/libusb-1.0-doc.list
/var/lib/dpkg/info/libusb-1.0-doc.md5sums
/var/lib/dpkg/info/libusbmuxd4:amd64.list
/var/lib/dpkg/info/libusbmuxd4:amd64.md5sums
/var/lib/dpkg/info/libusbmuxd4:amd64.shlibs
/var/lib/dpkg/info/libusbmuxd4:amd64.symbols
/var/lib/dpkg/info/libusbmuxd4:amd64.triggers

Can help my to fill this

LIBS += -L[LOCATION_OF_THE_libusb_LIBRARY_ON_THE_SYSTEM]
INCLUDEPATH += [LOCATION_OF_libusb_HEADER_FILE]
DEPENDPATH += [LOCATION_OF_libusb_HEADER_FILE]
PRE_TARGETDEPS += [LOCATION_OF_libusb.a_ARCHIVE_FILE_OF_THE_LIBRARY]

I couldn't find the lib any clue?

this is what i have

LIBS += -L
INCLUDEPATH += /usr/include/libusb-1.0/
DEPENDPATH += /usr/include/libusb-1.0/libusb.h
PRE_TARGETDEPS += /usr/lib/x86_64-linux-gnu/

[dheerendra]

/lib/x86_64-linux-gnu/libusb-1.0.so.0 is present under the directory /lib/x86_64-linux-gnu/

LIBS += -L/lib/x86_64-linux-gnu -llibusb
INCLUDE PATH +=/usr/include/libusb-1.0/

[mrjj]

Did you do
sudo apt-get install libusb-1.0-0-dev

or was it already installed ?
mine is in
/lib/i386-linux-gnu/libusb-1.0.so.0
(Mint 64)

[aurquiel]

I am making easy this way a simple program to display the information from USB.

I made the .pro getting information from the command in console locate libusb

pasante@pasante-MN-50:~$ locate libusb
/lib/firmware/carl9170fw/extra/libusb-zeropacket.diff
/lib/x86_64-linux-gnu/libusb-1.0.so.0
/lib/x86_64-linux-gnu/libusb-1.0.so.0.1.0
/opt/Qt5.8.0/5.8/Src/coin/provisioning/qtci-linux-RHEL-6.6-x86_64/libusb.sh
/opt/Qt5.8.0/5.8/Src/coin/provisioning/qtci-linux-Ubuntu-14.04-x86_64/libusb.sh
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/build/linux/unbundle/libusb.gyp
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/BUILD.gn
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/OWNERS
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/README.chromium
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/assign-endpoints-checks.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/composite-hid-close.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/darwin-sigfpe.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/libusb.gyp
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/linux-udev.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/open-fd.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/upstream-tick147.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/windows-build.patch
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/AUTHORS
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/COPYING
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/config.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/core.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/descriptor.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/hotplug.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/hotplug.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/interrupt.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/interrupt.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/io.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/libusb.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/libusbi.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/strerror.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/sync.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/version.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/version_nano.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/DEPS
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/darwin_usb.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/darwin_usb.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/linux_netlink.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/linux_udev.cc
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/linux_usbfs.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/linux_usbfs.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/openbsd_usb.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/poll_posix.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/poll_posix.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/poll_windows.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/poll_windows.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/threads_posix.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/threads_posix.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/threads_windows.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/threads_windows.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/wince_usb.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/wince_usb.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/windows_common.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/windows_usb.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb/os/windows_usb.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc/config.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc/errno.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc/inttypes.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc/missing.c
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc/missing.h
/opt/Qt5.8.0/5.8/Src/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/msvc/stdint.h
/opt/Qt5.8.0/Docs/Qt-5.8/qtwebengine/qtwebengine-3rdparty-libusbx.html
/usr/include/libusb-1.0
/usr/include/libusb-1.0/libusb.h
/usr/lib/x86_64-linux-gnu/libusb-1.0.a
/usr/lib/x86_64-linux-gnu/libusb-1.0.so
/usr/lib/x86_64-linux-gnu/libusbmuxd.so.4
/usr/lib/x86_64-linux-gnu/libusbmuxd.so.4.0.0
/usr/lib/x86_64-linux-gnu/pkgconfig/libusb-1.0.pc
/usr/share/doc/libusb-1.0-0
/usr/share/doc/libusb-1.0-0-dbg
/usr/share/doc/libusb-1.0-0-dev
/usr/share/doc/libusb-1.0-doc
/usr/share/doc/libusbmuxd4
/usr/share/doc/libusb-1.0-0/README
/usr/share/doc/libusb-1.0-0/changelog.Debian.gz
/usr/share/doc/libusb-1.0-0/copyright
/usr/share/doc/libusb-1.0-0-dbg/changelog.Debian.gz
/usr/share/doc/libusb-1.0-0-dbg/copyright
/usr/share/doc/libusb-1.0-0-dev/README
/usr/share/doc/libusb-1.0-0-dev/changelog.Debian.gz
/usr/share/doc/libusb-1.0-0-dev/copyright
/usr/share/doc/libusb-1.0-doc/PORTING
/usr/share/doc/libusb-1.0-doc/README
/usr/share/doc/libusb-1.0-doc/changelog.Debian.gz
/usr/share/doc/libusb-1.0-doc/copyright
/usr/share/doc/libusb-1.0-doc/html
/usr/share/doc/libusb-1.0-doc/html/annotated.html
/usr/share/doc/libusb-1.0-doc/html/api.html
/usr/share/doc/libusb-1.0-doc/html/arrowdown.png
/usr/share/doc/libusb-1.0-doc/html/arrowright.png
/usr/share/doc/libusb-1.0-doc/html/bc_s.png
/usr/share/doc/libusb-1.0-doc/html/bdwn.png
/usr/share/doc/libusb-1.0-doc/html/caveats.html
/usr/share/doc/libusb-1.0-doc/html/classes.html
/usr/share/doc/libusb-1.0-doc/html/closed.png
/usr/share/doc/libusb-1.0-doc/html/contexts.html
/usr/share/doc/libusb-1.0-doc/html/dir_6560186179ae86ab3fbed805e7cb86e4.html
/usr/share/doc/libusb-1.0-doc/html/doc.png
/usr/share/doc/libusb-1.0-doc/html/doxygen.css
/usr/share/doc/libusb-1.0-doc/html/doxygen.png
/usr/share/doc/libusb-1.0-doc/html/files.html
/usr/share/doc/libusb-1.0-doc/html/folderclosed.png
/usr/share/doc/libusb-1.0-doc/html/folderopen.png
/usr/share/doc/libusb-1.0-doc/html/functions.html
/usr/share/doc/libusb-1.0-doc/html/functions_vars.html
/usr/share/doc/libusb-1.0-doc/html/group__asyncio.html
/usr/share/doc/libusb-1.0-doc/html/group__desc.html
/usr/share/doc/libusb-1.0-doc/html/group__dev.html
/usr/share/doc/libusb-1.0-doc/html/group__hotplug.html
/usr/share/doc/libusb-1.0-doc/html/group__lib.html
/usr/share/doc/libusb-1.0-doc/html/group__misc.html
/usr/share/doc/libusb-1.0-doc/html/group__poll.html
/usr/share/doc/libusb-1.0-doc/html/group__syncio.html
/usr/share/doc/libusb-1.0-doc/html/hotplug.html
/usr/share/doc/libusb-1.0-doc/html/index.html
/usr/share/doc/libusb-1.0-doc/html/io.html
/usr/share/doc/libusb-1.0-doc/html/jquery.js
/usr/share/doc/libusb-1.0-doc/html/libusb_8h_source.html
/usr/share/doc/libusb-1.0-doc/html/modules.html
/usr/share/doc/libusb-1.0-doc/html/mtasync.html
/usr/share/doc/libusb-1.0-doc/html/nav_f.png
/usr/share/doc/libusb-1.0-doc/html/nav_g.png
/usr/share/doc/libusb-1.0-doc/html/nav_h.png
/usr/share/doc/libusb-1.0-doc/html/open.png
/usr/share/doc/libusb-1.0-doc/html/packetoverflow.html
/usr/share/doc/libusb-1.0-doc/html/pages.html
/usr/share/doc/libusb-1.0-doc/html/splitbar.png
/usr/share/doc/libusb-1.0-doc/html/structlibusb__bos__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__bos__dev__capability__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__config__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__container__id__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__control__setup.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__device__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__endpoint__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__interface.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__interface__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__iso__packet__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__pollfd.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__ss__endpoint__companion__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__ss__usb__device__capability__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__transfer.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__usb__2__0__extension__descriptor.html
/usr/share/doc/libusb-1.0-doc/html/structlibusb__version.html
/usr/share/doc/libusb-1.0-doc/html/sync_off.png
/usr/share/doc/libusb-1.0-doc/html/sync_on.png
/usr/share/doc/libusb-1.0-doc/html/tab_a.png
/usr/share/doc/libusb-1.0-doc/html/tab_b.png
/usr/share/doc/libusb-1.0-doc/html/tab_h.png
/usr/share/doc/libusb-1.0-doc/html/tab_s.png
/usr/share/doc/libusb-1.0-doc/html/tabs.css
/usr/share/doc/libusb-1.0-doc/html/version_8h_source.html
/usr/share/doc/libusb-1.0-doc/html/version__nano_8h_source.html
/usr/share/doc/libusbmuxd4/changelog.Debian.gz
/usr/share/doc/libusbmuxd4/copyright
/usr/share/doc-base/libusb-1.0-doc
/usr/share/lintian/overrides/libusbmuxd4
/var/cache/apt/archives/libusb-1.0-0-dbg_2%3a1.0.20-1_amd64.deb
/var/cache/apt/archives/libusb-1.0-0-dev_2%3a1.0.20-1_amd64.deb
/var/cache/apt/archives/libusb-1.0-doc_2%3a1.0.20-1_all.deb
/var/lib/dpkg/info/libusb-1.0-0-dbg:amd64.list
/var/lib/dpkg/info/libusb-1.0-0-dbg:amd64.md5sums
/var/lib/dpkg/info/libusb-1.0-0-dev:amd64.list
/var/lib/dpkg/info/libusb-1.0-0-dev:amd64.md5sums
/var/lib/dpkg/info/libusb-1.0-0:amd64.list
/var/lib/dpkg/info/libusb-1.0-0:amd64.md5sums
/var/lib/dpkg/info/libusb-1.0-0:amd64.shlibs
/var/lib/dpkg/info/libusb-1.0-0:amd64.symbols
/var/lib/dpkg/info/libusb-1.0-0:amd64.triggers
/var/lib/dpkg/info/libusb-1.0-doc.list
/var/lib/dpkg/info/libusb-1.0-doc.md5sums
/var/lib/dpkg/info/libusbmuxd4:amd64.list
/var/lib/dpkg/info/libusbmuxd4:amd64.md5sums
/var/lib/dpkg/info/libusbmuxd4:amd64.shlibs
/var/lib/dpkg/info/libusbmuxd4:amd64.symbols
/var/lib/dpkg/info/libusbmuxd4:amd64.triggers

the .pro file look like this

#-------------------------------------------------
#
# Project created by QtCreator 2017-01-31T11:51:20
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = usb_test
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

LIBS += -L/usr/lib/x86_64-linux-gnu/
INCLUDEPATH += /usr/include/libusb-1.0/
DEPENDPATH += /usr/include/libusb-1.0/
PRE_TARGETDEPS += /usr/lib/x86_64-linux-gnu/

The mainwindows cpp is just a button who launch then function of the library libusb to get the devices, the tried to put it in a listwidget, i haven't move element to the listwidget because only in the function to get devices it doesn't compile

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QStringListModel>
#include <QStringList>
#include <QString>
#include <libusb-1.0/libusb.h>

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

}

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

void MainWindow::on_pushButton_clicked()
{
    libusb_device **list=NULL; //pointer to the pointer of the devices
    libusb_context *ctx=NULL;  //the context

    int notification = libusb_get_device_list(ctx,&list); //get a list of device fill dev[] struct
    
    QString casa="hello";
    ui->listWidget->addItem(casa);
}

when compile i get the error
/home/pasante/Escritorio/build-usb_test-Desktop_Qt_5_8_0_GCC_64bit-Debug/mainwindow.o:-1: error:In function MainWindow::on_pushButton_clicked()': /home/pasante/Escritorio/usb_test/mainwindow.cpp:29: reference to libusb_get_device_list' without define

Its the same problem in the program before, this one i more simple, i don't know why is not deference the function of libusb

[aurquiel]

I found the solution, in the .pro you only need this to link libusb

LIBS +=  -lusb-1.0

Here a simple program with tow list widgets one for look the id product an other for the vendor in a decimal way

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QStringListModel>
#include <QStringList>
#include <QString>
#include <libusb-1.0/libusb.h>
#include <iostream>

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

}

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

void MainWindow::on_pushButton_clicked()
{
    libusb_device **list=NULL; //pointer to the pointer od the device
    libusb_context *ctx=NULL;  //the context

    int r; //for return values
    ssize_t number_of_devices; //holding number of devices in list
    r = libusb_init(&ctx); //initialize a library session
    if(r < 0)
    {
        QString one_error="Error library inicialization";
        ui->listWidget->addItem(one_error);

    }

    libusb_set_debug(ctx, 3); //set verbosity level to 3, as suggested in the documentation

    number_of_devices = libusb_get_device_list(ctx,&list); //get a list of device fil dev[] struct

    if(number_of_devices < 0)
    {
        QString two_error="Any device found";
        ui->listWidget->addItem(two_error);
    }

    unsigned int i=0;  //Iteration the number of drivers founded

    libusb_device_descriptor descriptor; //Store the decriptions of the USB devices there were founded

    for (i=0;i<number_of_devices;i++)
    {
        int status = libusb_get_device_descriptor(list[i],&descriptor);

        if(status < 0)
        {
            QString three_error="Error on getting description";
            ui->listWidget->addItem(three_error);
        }

        QString idProduct= QString::number((int)descriptor.idProduct);
        QString idVendor= QString::number((int)descriptor.idVendor);

        ui->listWidget->addItem(idProduct);
        ui->listWidget_2->addItem(idVendor);
    }

}

You will ablel to see the different usb devices of your computer. I hope some one will find this and solve his problems with libusb qt and linux. It's necessary documentation about this point for other users, i lost a lot of time in this.

Cheers guys, any more doubts i will write it in the forum.