XN_C_API XnStatus xnUSBOpenDeviceByPath(const XnUSBConnectionString strDevicePath, XN_USB_DEV_HANDLE* pDevHandlePtr)
{
XnStatus nRetVal = XN_STATUS_OK;
// parse connection string
XnUInt16 nVendorID = 0;
XnUInt16 nProductID = 0;
XnUInt8 nBus = 0;
XnUInt8 nAddress = 0;
sscanf(strDevicePath, "%hx/%hx@%hhu/%hhu", &nVendorID, &nProductID, &nBus, &nAddress);
if (nVendorID == 0 || nProductID == 0 || nBus == 0 || nAddress == 0)
{
XN_LOG_WARNING_RETURN(XN_STATUS_USB_DEVICE_OPEN_FAILED, "Invalid connection string: %s", strDevicePath);
}
// find device
libusb_device** ppDevices;
ssize_t nDeviceCount = libusb_get_device_list(g_InitData.pContext, &ppDevices);
libusb_device* pRequestedDevice = NULL;
for (ssize_t i = 0; i < nDeviceCount; ++i)
{
libusb_device* pDevice = ppDevices[i];
// get device descriptor
libusb_device_descriptor desc;
int rc = libusb_get_device_descriptor(pDevice, &desc);
if (rc != 0)
{
libusb_free_device_list(ppDevices, 1);
return (XN_STATUS_USB_ENUMERATE_FAILED);
}
// check if this is the requested device
if (desc.idVendor == nVendorID && desc.idProduct == nProductID && libusb_get_bus_number(pDevice) == nBus && libusb_get_device_address(pDevice) == nAddress)
{
// add a reference to the device (so it won't be destroyed when list is freed)
libusb_ref_device(pDevice);
pRequestedDevice = pDevice;
break;
}
}
libusb_free_device_list(ppDevices, 1);
nRetVal = xnUSBOpenDeviceImpl(pRequestedDevice, pDevHandlePtr);
XN_IS_STATUS_OK(nRetVal);
return (XN_STATUS_OK);
}
XN_C_API XnStatus xnUSBOpenDevice(XnUInt16 nVendorID, XnUInt16 nProductID, void* pExtraParam, void* pExtraParam2, XN_USB_DEV_HANDLE* pDevHandlePtr)
{
XnStatus nRetVal = XN_STATUS_OK;
// make sure library was initialized
XN_VALIDATE_USB_INIT();
// Validate parameters
XN_VALIDATE_OUTPUT_PTR(pDevHandlePtr);
libusb_device* pDevice;
nRetVal = FindDevice(nVendorID, nProductID, pExtraParam, &pDevice);
XN_IS_STATUS_OK(nRetVal);
nRetVal = xnUSBOpenDeviceImpl(pDevice, pDevHandlePtr);
XN_IS_STATUS_OK(nRetVal);
return (XN_STATUS_OK);
}
XN_C_API XnStatus xnUSBOpenDeviceByPath(const XnUSBConnectionString strDevicePath, XN_USB_DEV_HANDLE* pDevHandlePtr)
{
return xnUSBOpenDeviceImpl(strDevicePath, pDevHandlePtr);
}
XN_C_API XnStatus xnUSBOpenDevice(XnUInt16 /*nVendorID*/, XnUInt16 /*nProductID*/, void* /*pExtraParam*/, void* pExtraParam2, XN_USB_DEV_HANDLE* pDevHandlePtr)
{
return xnUSBOpenDeviceImpl((const XnChar*)pExtraParam2, pDevHandlePtr);
}
