/// <summary>
/// Find and instanciate types implementing the CameraManager base class.
/// </summary>
public static void LoadCameraManagersPlugins()
{
// A camera plugin is a directory under Plugins/Camera with an XML manifest file and an assembly
// implementing the CameraManager abstract class.
// To install and uninstall a plugin we add/delete the corresponding folder.
// This discovery mechanism is duplicated for each instance.
// This adds only a few milliseconds so we don't keep a cache in preferences.
string pluginsDirectory = Software.CameraPluginsDirectory;
List <CameraManagerPluginInfo> plugins = new List <CameraManagerPluginInfo>();
List <string> directories = Directory.GetDirectories(pluginsDirectory).ToList();
foreach (string directory in directories)
{
string manifest = Path.Combine(directory, "manifest.xml");
CameraManagerPluginInfo pluginInfo = CameraManagerPluginInfo.Load(manifest);
if (pluginInfo == null)
{
continue;
}
plugins.Add(pluginInfo);
}
log.DebugFormat("Loaded camera plugins manifests.");
// Load all compatible plugins.
foreach (CameraManagerPluginInfo info in plugins)
{
LoadCameraManagerPlugin(pluginsDirectory, info);
}
}
private static void LoadCameraManagerPlugin(string pluginsDirectory, CameraManagerPluginInfo info)
{
string dir = Path.Combine(pluginsDirectory, info.Directory);
if (!Directory.Exists(dir))
{
log.ErrorFormat("Could not find directory for camera manager plugin: {0}.", info.Name);
return;
}
string assemblyFile = Path.Combine(dir, info.AssemblyName);
if (!File.Exists(assemblyFile))
{
log.ErrorFormat("Could not find assembly: {0}.", info.AssemblyName);
return;
}
try
{
// LoadFrom is problematic on many systems for assemblies downloaded from the Internet.
// Loading into a different AppDomain is not really possible, the code is too tightly coupled for perfs.
Assembly a = Assembly.LoadFrom(assemblyFile);
Type t = a.GetType(info.ClassName);
LoadCameraManager(t);
}
catch (ReflectionTypeLoadException ex)
{
foreach (Exception exception in ex.LoaderExceptions)
{
log.ErrorFormat(exception.Message.ToString());
}
}
catch (Exception e)
{
log.ErrorFormat("Could not load camera manager plugin {0}, {1}", info.Name, e.Message);
}
}
