g++ yourstuff -L$DAQLIB -Wl-rpath=$DAQLIB -llibUSB1 \
`pkg-config libusb-1.0 --libs` `pkg-config libusb-1.0 --cflags`
#include <USB.h>
class USB
{
public:
USB();
virtual ~USB();
void setDebug(int level);
std::vector<USBDeviceInfo*> enumerate();
};
Provides a top level wrapping of a stream of operations on a low level USB user space API. If the library requires some context object or other application or stream global object, this object encapsulates it.
A few opt level services are also provided that do not require accessing USB devices that are attached to the system's usb subsystem. Note that device enumeration is something that's done in hotplug and builds system data structures that don't require any device operations to access.
void setDebug(int level);
Provides a mechanism to set the underlying library's
debug level. Currently, level
is a debug level value in
libusb.h. In a later
implementation it's possble we'll make this
method map from some generic set of levels to
debug levels in the underlying library.
std::vector<USBDeviceInfo*> enumerate();
Returns a container that contains pointers to
USBDeviceInfo*
objects for all of the devices attached to the
system's USB subsystem. Note that these
objects are dynamically allocated and must
be deleteed when no longer
required.
Below we show a typical use case for the
enumerate method.
#include <USB.h>
#include <stdexcept;
#include <iostream>
...
try {
USB usb;
auto devices usb.enumerate();
USBDeviceInfo* selectDevice(devices);
// Operate on the selected device.
...
}
catch (std::exception& e) {
std::cerr << "Error encountered: " << e.what()
<< std::endl;
}
The example enumerates the devices attached to the
USB subsystem and then calls selectDevice
(internal to the application) to select the USB device
to use. All other devices in the container
are deleed by selectDevice.
See the documentation of USBDeviceInfo
for more information about how to select a specific
device and open it for use.