Example #1
0
// ListDevices calls each with each enumerated device.
// If the function returns true, the device is opened and a Device is returned if the operation succeeds.
// Every Device returned (whether an error is also returned or not) must be closed.
// If there are any errors enumerating the devices,
// the final one is returned along with any successfully opened devices.
func (c *Context) ListDevices(each func(desc *Descriptor) bool) ([]*Device, error) {
	var list **C.libusb_device
	cnt := C.libusb_get_device_list(c.ctx, &list)
	if cnt < 0 {
		return nil, usbError(cnt)
	}
	defer C.libusb_free_device_list(list, 1)

	var slice []*C.libusb_device
	*(*reflect.SliceHeader)(unsafe.Pointer(&slice)) = reflect.SliceHeader{
		Data: uintptr(unsafe.Pointer(list)),
		Len:  int(cnt),
		Cap:  int(cnt),
	}

	var reterr error
	ret := []*Device{}
	for _, dev := range slice {
		desc, err := newDescriptor(dev)
		if err != nil {
			reterr = err
			continue
		}

		if each(desc) {
			var handle *C.libusb_device_handle
			if errno := C.libusb_open(dev, &handle); errno != 0 {
				errName := C.GoString(C.libusb_error_name(errno))
				reterr = errors.New("libusb error: " + errName)
				continue
			}
			ret = append(ret, newDevice(handle, desc))
		}
	}
	return ret, reterr
}
Example #2
0
File: usb.go Project: hanwen/usb
func (e Error) Error() string {
	return C.GoString(C.libusb_error_name(C.int(e)))
}
Example #3
0
func (e *libusbError) Error() string {
	return fmt.Sprintf("%s (%s)",
		C.GoString(C.libusb_strerror(C.enum_libusb_error(e.code))),
		C.GoString(C.libusb_error_name(e.code)))
}
Example #4
0
File: usb.go Project: karitra/mp707
func MakeUsbError(code C.int) *UsbError {
	return &UsbError{
		UsbErrorCode(code) , 
		UsbErrorDesc(C.GoString(C.libusb_error_name(code))) }
}