Libraries: libusb question
MikeSD
ipscone@msdsite.com
Thu Jun 22 16:25:00 GMT 2017
*Sorry, didn't realize it was off-topic. I won't continue this, on this forum
after this one.
This was the error generated:
There were 9 "reference" errors like this:
14|undefined reference to `libusb_init@4'|*
*This was the main.cpp file:*
#include <iostream>
//#include "lusb0_usb.h"
#include "libusb.h"
using namespace std;
void printdev(libusb_device *dev); //prototype of the function
int main() {
libusb_device **devs; //pointer to pointer of device, used to retrieve a
list of devices
libusb_context *ctx = NULL; //a libusb session
int r; //for return values
ssize_t cnt; //holding number of devices in list
r = libusb_init(&ctx); //initialize a library session
if(r < 0) {
cout<<"Init Error "<<r<<endl; //there was an error
return 1;
}
libusb_set_debug(ctx, 3); //set verbosity level to 3, as suggested in
the documentation
cnt = libusb_get_device_list(ctx, &devs); //get the list of devices
if(cnt < 0) {
cout<<"Get Device Error"<<endl; //there was an
error
}
cout<<cnt<<" Devices in list."<<endl;
//print total number of usb devices
ssize_t i; //for iterating through the list
for(i = 0; i < cnt; i++) {
printdev(devs[i]); //print specs of this device
}
libusb_free_device_list(devs, 1); //free the list, unref the devices in
it
libusb_exit(ctx); //close the session
return 0;
}
void printdev(libusb_device *dev) {
libusb_device_descriptor desc;
int r = libusb_get_device_descriptor(dev, &desc);
if (r < 0) {
cout<<"failed to get device descriptor"<<endl;
return;
}
cout<<"Number of possible configurations:
"<<(int)desc.bNumConfigurations<<" ";
cout<<"Device Class:
"<<(int)desc.bDeviceClass<<" ";
cout<<"VendorID: "<<desc.idVendor<<"
";
cout<<"ProductID: "<<desc.idProduct<<endl;
libusb_config_descriptor *config;
libusb_get_config_descriptor(dev, 0, &config);
cout<<"Interfaces:
"<<(int)config->bNumInterfaces<<" ||| ";
const libusb_interface *inter;
const libusb_interface_descriptor *interdesc;
const libusb_endpoint_descriptor *epdesc;
for(int i=0; i<(int)config->bNumInterfaces; i++) {
inter = &config->interface[i];
cout<<"Number of alternate settings: "<<inter->num_altsetting<<" |
";
for(int j=0; j<inter->num_altsetting; j++) {
interdesc = &inter->altsetting[j];
cout<<"Interface Number: "<<(int)interdesc->bInterfaceNumber<<"
| ";
cout<<"Number of endpoints: "<<(int)interdesc->bNumEndpoints<<"
| ";
for(int k=0; k<(int)interdesc->bNumEndpoints; k++) {
epdesc = &interdesc->endpoint[k];
cout<<"Descriptor Type: "<<(int)epdesc->bDescriptorType<<" |
";
cout<<"EP Address: "<<(int)epdesc->bEndpointAddress<<" | ";
}
}
}
cout<<endl<<endl<<endl;
libusb_free_config_descriptor(config);
}
--
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