/// <summary>
/// Read the registry to learn about the preview handlers that are available on this machine
/// Return a structure containing 2 collections. One of all the file extensions and whether we found a preview handler
/// registered, and one of the preview handlers and their CLSIDs
/// </summary>
internal static RegistrationData LoadRegistrationInformation()
{
// Load and sort all preview handler information from registry
List<PreviewHandlerInfo> handlers = new List<PreviewHandlerInfo>();
using (RegistryKey handlersKey = Registry.LocalMachine.OpenSubKey(
BaseRegistryKey))
{
foreach (string id in handlersKey.GetValueNames())
{
PreviewHandlerInfo handler = new PreviewHandlerInfo();
handler.ID = id;
handler.Name = handlersKey.GetValue(id, null) as string;
handlers.Add(handler);
}
}
handlers.Sort(delegate(PreviewHandlerInfo first, PreviewHandlerInfo second)
{
if (first.Name == null) return 1;
else if (second.Name == null) return -1;
else return first.Name.CompareTo(second.Name);
});
// Create a lookup table of preview handler ID -> PreviewHandlerInfo
Dictionary<string, PreviewHandlerInfo> handlerMapping = new Dictionary<string, PreviewHandlerInfo>(handlers.Count);
foreach (PreviewHandlerInfo handler in handlers)
{
handlerMapping.Add(handler.ID, handler);
}
// Get all classes/extensions from registry
string[] extensions = Registry.ClassesRoot.GetSubKeyNames();
// Find out what each extension is registered to be previewed with
List<ExtensionInfo> extensionInfos = new List<ExtensionInfo>(extensions.Length);
foreach (string extension in extensions)
{
if (extension.StartsWith("."))
{
ExtensionInfo info = new ExtensionInfo();
info.Extension = extension;
string id = Registry.GetValue(
string.Format(BaseClsIDKey, extension),
null, null) as string;
if (id == null)
id = Registry.GetValue(
string.Format(BaseClsIdKey2, extension),
null, null) as string;
PreviewHandlerInfo mappedHandler;
if (id != null && handlerMapping.TryGetValue(id, out mappedHandler)) info.Handler = mappedHandler;
extensionInfos.Add(info);
}
}
// Return the information
RegistrationData data = new RegistrationData();
data.Handlers = handlers;
data.Extensions = extensionInfos;
return data;
}
/// <summary>
/// Read the registry to learn about the preview handlers that are available on this machine
/// Return a structure containing 2 collections. One of all the file extensions and whether we found a preview handler
/// registered, and one of the preview handlers and their CLSIDs
/// </summary>
internal static RegistrationData LoadRegistrationInformation()
{
// Load and sort all preview handler information from registry
List <PreviewHandlerInfo> handlers = new List <PreviewHandlerInfo>();
using (RegistryKey handlersKey = Registry.LocalMachine.OpenSubKey(
BaseRegistryKey))
{
foreach (string id in handlersKey.GetValueNames())
{
PreviewHandlerInfo handler = new PreviewHandlerInfo();
handler.ID = id;
handler.Name = handlersKey.GetValue(id, null) as string;
handlers.Add(handler);
}
}
handlers.Sort(delegate(PreviewHandlerInfo first, PreviewHandlerInfo second)
{
if (first.Name == null)
{
return(1);
}
else if (second.Name == null)
{
return(-1);
}
else
{
return(first.Name.CompareTo(second.Name));
}
});
// Create a lookup table of preview handler ID -> PreviewHandlerInfo
Dictionary <string, PreviewHandlerInfo> handlerMapping = new Dictionary <string, PreviewHandlerInfo>(handlers.Count);
foreach (PreviewHandlerInfo handler in handlers)
{
handlerMapping.Add(handler.ID, handler);
}
// Get all classes/extensions from registry
string[] extensions = Registry.ClassesRoot.GetSubKeyNames();
// Find out what each extension is registered to be previewed with
List <ExtensionInfo> extensionInfos = new List <ExtensionInfo>(extensions.Length);
foreach (string extension in extensions)
{
if (extension.StartsWith("."))
{
ExtensionInfo info = new ExtensionInfo();
info.Extension = extension;
string id = Registry.GetValue(
string.Format(BaseClsIDKey, extension),
null, null) as string;
if (id == null)
{
id = Registry.GetValue(
string.Format(BaseClsIdKey2, extension),
null, null) as string;
}
PreviewHandlerInfo mappedHandler;
if (id != null && handlerMapping.TryGetValue(id, out mappedHandler))
{
info.Handler = mappedHandler;
}
extensionInfos.Add(info);
}
}
// Return the information
RegistrationData data = new RegistrationData();
data.Handlers = handlers;
data.Extensions = extensionInfos;
return(data);
}
