private void ConfigureExtensionsList()
{
PreviewHandlerInfo handler = handlerComboBox.SelectedItem as PreviewHandlerInfo;
if (handler != null)
{
UseWaitCursor = true;
_loading = true;
handlerComboBox.Enabled = false;
extensionsListBox.Enabled = false;
extensionsListBox.SuspendLayout();
extensionsListBox.Items.Clear();
foreach (ExtensionInfo info in _regData.Extensions)
{
bool isChecked = info.Handler == handler;
if (isChecked || !showOnlyRegisteredCheckBox.Checked)
{
extensionsListBox.Items.Add(info, isChecked);
}
}
extensionsListBox.ResumeLayout();
extensionsListBox.Enabled = true;
handlerComboBox.Enabled = true;
_loading = false;
UseWaitCursor = false;
}
}
private static void RegisterHandlerForExtension(string extension, PreviewHandlerInfo handler)
{
using (RegistryKey extensionKey = Registry.ClassesRoot.CreateSubKey(extension))
using (RegistryKey shellexKey = extensionKey.CreateSubKey("shellex"))
using (RegistryKey previewKey = shellexKey.CreateSubKey("{8895b1c6-b41f-4c1c-a562-0d564250836f}"))
{
previewKey.SetValue(null, handler.ID, RegistryValueKind.String);
}
}
public ExtensionInfo(string extension)
{
var hId = Registry.GetValue($@"HKEY_CLASSES_ROOT\{extension}\shellex\{{8895b1c6-b41f-4c1c-a562-0d564250836f}}", null, null) as string;
Handler = new PreviewHandlerInfo {
ID = hId,
Name = Registry.LocalMachine.GetValue($@"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\PreviewHandlers\\{hId}") as string
};
}
private void extensionsListBox_ItemCheck(object sender, ItemCheckEventArgs e)
{
if (!_loading)
{
if (handlerComboBox.SelectedItem != null)
{
PreviewHandlerInfo handlerInfo = handlerComboBox.SelectedItem as PreviewHandlerInfo;
ExtensionInfo extensionInfo = (ExtensionInfo)extensionsListBox.Items[e.Index];
if (e.CurrentValue == CheckState.Unchecked)
{
RegisterHandlerForExtension(extensionInfo.Extension, handlerInfo);
extensionInfo.Handler = handlerInfo;
}
else
{
UnregisterHandlerForExtension(extensionInfo.Extension);
extensionInfo.Handler = null;
}
}
}
}
private RegistrationData LoadRegistrationInformation()
{
// Load and sort all preview handler information from registry
List <PreviewHandlerInfo> handlers = new List <PreviewHandlerInfo>();
using (RegistryKey handlersKey = Registry.LocalMachine.OpenSubKey(
"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\PreviewHandlers", true))
{
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)
{
ExtensionInfo info = new ExtensionInfo();
info.Extension = extension;
string id = Registry.GetValue(
string.Format(@"HKEY_CLASSES_ROOT\{0}\shellex\{{8895b1c6-b41f-4c1c-a562-0d564250836f}}", 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);
}
