//-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// UpdateDeviceStates()
//-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
void PlugIn::UpdateDeviceStates()
{
// Get the current state of all the devices plugged in from the SampleAssistant
DPA::Sample::AutoFreeUnboundedArray<DPA::Sample::DeviceState> deviceStates;
DPA::Sample::GetDeviceStates(mAssistantPort, mDeviceEventPort->GetMachPort(), deviceStates);
// Determine how many devices have been removed (if any).
// This will be done by iterating over all the devices the PlugIn knows about and making sure they are present in the deviceStates array
{
std::vector<Device*> removedDevices;
for (UInt32 i = 0 ; i < GetNumberDevices() ; ++i)
{
Device* device = static_cast<Device*>(GetDeviceByIndex(i));
bool found = false;
// See if it can be located in the deviceStates array
for (UInt32 ii = 0; ii < deviceStates.GetLength() ; ++ii)
{
if (deviceStates[ii].mGUID == device->GetDeviceGUID())
{
found = true;
break;
}
}
// If the device was not found, stick into the vector of unplugged devices
if (not found)
removedDevices.push_back(device);
}
// Remove all the unplugged devices
for (std::vector<Device*>::iterator i = removedDevices.begin() ; i != removedDevices.end() ; ++i)
DeviceRemoved(**i);
}
// Determine how many new devices are present
{
for (UInt32 i = 0; i < deviceStates.GetLength() ; ++i)
{
try
{
// This will throw an exception if the device is not found
(void) GetDeviceByGUID(deviceStates[i].mGUID);
}
catch (...)
{
// No device was found with the indicated GUID, so it is a new device
DeviceArrived(deviceStates[i].mGUID, deviceStates[i].mRegistryPath);
}
}
}
}
//-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// GetDeviceByGUID()
//-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Device& PlugIn::GetDeviceByGUID(UInt64 guid) const
{
Device* device = 0;
bool found = false;
// Iterate over the plugIn's devices and find the one whose guid matches
for (UInt32 i = 0 ; i < GetNumberDevices() ; ++i)
{
device = static_cast<Device*>(GetDeviceByIndex(i));
ThrowIfNULL(device, CAException(kCMIOHardwareBadDeviceError), "CMIO::DP::Sample::PlugIn::GetDeviceByGUID: no device for index");
if (guid == device->GetDeviceGUID())
{
found = true;
break;
}
}
// Make sure that a device was actually found
if (not found)
throw CAException(kCMIOHardwareBadDeviceError);
return *device;
}