问题
I am trying to compile the example libusb.c provided by libusb package (if you dl the source code.)
It doesn't work to say the least.
#include <stdio.h>
#include <sys/types.h>
#include <libusb/libusb.h>
That causes it to fail, there is no libusb/libusb.h it's usb.h, so I change that. And it fails in new and innovative ways.
I've copied the file over, exactly, and named it example.c
I am using these commands and variations:
gcc -o example example.c -lusb -L /usr/lib/libusb.a
gcc -o example example.c -lusb -L /usr/lib/libusb.so
The errors I get when compiling are:
example.c:25: error: expected ‘)’ before ‘*’ token
example.c: In function ‘main’:
example.c:46: error: ‘libusb_device’ undeclared (first use in this function)
example.c:46: error: (Each undeclared identifier is reported only once
example.c:46: error: for each function it appears in.)
example.c:46: error: ‘devs’ undeclared (first use in this function)
Line 25: static void print_devs(libusb_device **devs)
Line 46: libusb_device **devs;
At first I followed a tutorial, and that failed to compile, in more or less the same ways, so I decided to just try the provided example, and that failed.
Can anyone help me out? Explain what I am doing wrong, cause I am lost on this one.
回答1:
This is what I had to do on Debian. It should be at least similar in Ubuntu.
Install libusb-1.0-0-dev
Instead of:
#include <libusb/libusb.h>
do:
#include <libusb.h>
Compile with:
gcc example.c `pkg-config --libs --cflags libusb-1.0`
回答2:
Just en explanation why your attempt to replace libusb/libusb.h with usb.h fails: usb.h is a header from linux-headers, not from libusb-dev. You need #include <libusb.h> instead.
来源：https://stackoverflow.com/questions/7741141/compiling-against-libusb-dev-on-ubuntu