private static void Unregister(Type registerType)
{
if (registerType != null && registerType.IsSubclassOf(typeof(PreviewHandler)))
{
object[] attrs = (object[])registerType.GetCustomAttributes(typeof(PreviewHandlerAttribute), true);
if (attrs != null && attrs.Length == 1)
{
PreviewHandlerAttribute attr = attrs[0] as PreviewHandlerAttribute;
UnregisterPreviewHandler(registerType.GUID, attr);
}
}
}
private static void RegisterPreviewHandler(Guid previewerGuid, PreviewHandlerAttribute attribute)
{
var guid = previewerGuid.ToString("B");
// Create a new prevhost AppID so that this always runs in its own isolated process
using (var appIdsKey = Registry.ClassesRoot.OpenSubKey("AppID", true))
using (var appIdKey = appIdsKey.CreateSubKey(attribute.AppId))
{
appIdKey.SetValue("DllSurrogate", @"%SystemRoot%\system32\prevhost.exe", RegistryValueKind.ExpandString);
}
// Add preview handler to preview handler list
using (var handlersKey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\PreviewHandlers", true))
{
handlersKey.SetValue(guid, attribute.Name, RegistryValueKind.String);
}
// Modify preview handler registration
using (var clsidKey = Registry.ClassesRoot.OpenSubKey("CLSID"))
using (var idKey = clsidKey.OpenSubKey(guid, true))
{
idKey.SetValue("DisplayName", attribute.Name, RegistryValueKind.String);
idKey.SetValue("AppID", attribute.AppId, RegistryValueKind.String);
idKey.SetValue("DisableLowILProcessIsolation", attribute.DisableLowILProcessIsolation ? 1 : 0, RegistryValueKind.DWord);
using (var inproc = idKey.OpenSubKey("InprocServer32", true))
{
inproc.SetValue("ThreadingModel", "Apartment", RegistryValueKind.String);
}
}
foreach (var extension in attribute.Extensions.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries))
{
Trace.WriteLine("Registering extension '" + extension + "' with previewer '" + guid + "'");
// Set preview handler for specific extension
using (var extensionKey = Registry.ClassesRoot.CreateSubKey(extension))
using (var shellexKey = extensionKey.CreateSubKey("shellex"))
using (var previewKey = shellexKey.CreateSubKey(Shell.Interop.HandlerNativeMethods.PreviewHandlerGuid.ToString("B")))
{
previewKey.SetValue(null, guid, RegistryValueKind.String);
}
}
}
private static void Register(Type registerType)
{
if (registerType != null && registerType.IsSubclassOf(typeof(PreviewHandler)))
{
object[] attrs = (object[])registerType.GetCustomAttributes(typeof(PreviewHandlerAttribute), true);
if (attrs != null && attrs.Length == 1)
{
PreviewHandlerAttribute attr = attrs[0] as PreviewHandlerAttribute;
ThrowIfNotValid(registerType);
RegisterPreviewHandler(registerType.GUID, attr);
}
else
{
throw new NotSupportedException(
string.Format(System.Globalization.CultureInfo.InvariantCulture,
LocalizedMessages.PreviewHandlerInvalidAttributes, registerType.Name));
}
}
}
private static void UnregisterPreviewHandler(Guid previewerGuid, PreviewHandlerAttribute attribute)
{
var guid = previewerGuid.ToString("B");
foreach (var extension in attribute.Extensions.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries))
{
Trace.WriteLine("Unregistering extension '" + extension + "' with previewer '" + guid + "'");
using (var shellexKey = Registry.ClassesRoot.OpenSubKey(extension + "\\shellex", true))
{
shellexKey.DeleteSubKey(Shell.Interop.HandlerNativeMethods.PreviewHandlerGuid.ToString(), false);
}
}
using (var appIdsKey = Registry.ClassesRoot.OpenSubKey("AppID", true))
{
appIdsKey.DeleteSubKey(attribute.AppId, false);
}
using (var classesKey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\PreviewHandlers", true))
{
classesKey.DeleteValue(guid, false);
}
}
private static void UnregisterPreviewHandler(Guid previewerGuid, PreviewHandlerAttribute attribute)
{
string guid = previewerGuid.ToString("B");
foreach (string extension in attribute.Extensions.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries))
{
Trace.WriteLine("Unregistering extension '" + extension + "' with previewer '" + guid + "'");
using (RegistryKey shellexKey = Registry.ClassesRoot.OpenSubKey(extension + "\\shellex", true))
{
shellexKey.DeleteSubKey(HandlerNativeMethods.IPreviewHandlerGuid.ToString(), false);
}
}
using (RegistryKey appIdsKey = Registry.ClassesRoot.OpenSubKey("AppID", true))
{
appIdsKey.DeleteSubKey(attribute.AppId, false);
}
using (RegistryKey classesKey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\PreviewHandlers", true))
{
classesKey.DeleteValue(guid, false);
}
}
private static void RegisterPreviewHandler(Guid previewerGuid, PreviewHandlerAttribute attribute)
{
string guid = previewerGuid.ToString("B");
// Create a new prevhost AppID so that this always runs in its own isolated process
using (RegistryKey appIdsKey = Registry.ClassesRoot.OpenSubKey("AppID", true))
using (RegistryKey appIdKey = appIdsKey.CreateSubKey(attribute.AppId))
{
appIdKey.SetValue("DllSurrogate", @"%SystemRoot%\system32\prevhost.exe", RegistryValueKind.ExpandString);
}
// Add preview handler to preview handler list
using (RegistryKey handlersKey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\PreviewHandlers", true))
{
handlersKey.SetValue(guid, attribute.Name, RegistryValueKind.String);
}
// Modify preview handler registration
using (RegistryKey clsidKey = Registry.ClassesRoot.OpenSubKey("CLSID"))
using (RegistryKey idKey = clsidKey.OpenSubKey(guid, true))
{
idKey.SetValue("DisplayName", attribute.Name, RegistryValueKind.String);
idKey.SetValue("AppID", attribute.AppId, RegistryValueKind.String);
idKey.SetValue("DisableLowILProcessIsolation", attribute.DisableLowILProcessIsolation ? 1 : 0, RegistryValueKind.DWord);
using (RegistryKey inproc = idKey.OpenSubKey("InprocServer32", true))
{
inproc.SetValue("ThreadingModel", "Apartment", RegistryValueKind.String);
}
}
foreach (string extension in attribute.Extensions.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries))
{
Trace.WriteLine("Registering extension '" + extension + "' with previewer '" + guid + "'");
// Set preview handler for specific extension
using (RegistryKey extensionKey = Registry.ClassesRoot.CreateSubKey(extension))
using (RegistryKey shellexKey = extensionKey.CreateSubKey("shellex"))
using (RegistryKey previewKey = shellexKey.CreateSubKey(HandlerNativeMethods.IPreviewHandlerGuid.ToString("B")))
{
previewKey.SetValue(null, guid, RegistryValueKind.String);
}
}
}
