/// <summary>
/// Method attempts to find that parent of a known folder by looking at the
/// ParentId field in the associated <see cref="KnownFolderProperties"/> object
/// and returns the new parent and child <see cref="IdList"/>s on success.
/// </summary>
/// <param name="ashellListId"></param>
/// <param name="parentList"></param>
/// <param name="relativeChild"></param>
/// <returns>True if known folder parent was available in ParentId field,
/// otherwise false.</returns>
public static bool GetParentChildIdList(IdList ashellListId
, out IdList parentList
, out IdList relativeChild)
{
parentList = null;
relativeChild = null;
relativeChild = ashellListId.GetRelativeChildId();
parentList = ashellListId.GetParentId();
// Get Parent Id which is always the first part minus last id in the sequence
if (parentList != null)
{
return(true);
}
// Try to find parent through known folder information lookup
using (KnownFolderNative kf = KnownFolderHelper.FromPIDL(ashellListId))
{
if (kf != null)
{
var props = KnownFolderHelper.GetFolderProperties(kf.Obj);
if (props.Parent != null)
{
if ((parentList = IdList.FromKnownFolderGuid(props.ParentId)) != null)
{
return(true);
}
}
}
}
// Just return the desktop as parent if the given item has no more parents
using (var desktop = KnownFolderHelper.FromKnownFolderGuid(new Guid(KF_ID.ID_FOLDERID_Desktop)))
{
IntPtr desktopPtr = default(IntPtr);
try
{
desktopPtr = desktop.KnownFolderToPIDL();
if (desktopPtr != default(IntPtr))
{
parentList = IdList.Create(PidlManager.Decode(desktopPtr));
return(true);
}
}
finally
{
if (desktopPtr != default(IntPtr))
{
desktopPtr = PidlManager.ILFree(desktopPtr);
}
}
}
return(false);
}
/// <summary>
/// Returns an <see cref="IdList"/> (PIDL) for a known folder given a
/// globally unique identifier.
/// </summary>
/// <param name="knownfolderId">A GUID for the requested known folder.</param>
/// <returns>A known folder representing the specified name.</returns>
/// <exception cref="System.ArgumentException">Thrown if the given Known Folder ID is invalid.</exception>
public static IdList FromKnownFolderGuid(Guid knownfolderId)
{
using (KnownFolderNative KF = KnownFolderHelper.FromKnownFolderGuid(knownfolderId))
{
if (KF != null)
{
IntPtr parentPidl = default(IntPtr);
try
{
parentPidl = KF.KnownFolderToPIDL();
// Convert PIDL into list of shellids and remove last id
return(IdList.Create(PidlManager.Decode(parentPidl)));
}
finally
{
parentPidl = PidlManager.ILFree(parentPidl);
}
}
}
return(null);
}
private void Init(IKnownFolderNative knownFolderNative,
NativeFolderDefinition nativeFolderDefinition)
{
this.Name = Marshal.PtrToStringUni(nativeFolderDefinition.name);
this.Category = nativeFolderDefinition.category;
this.CanonicalName = Marshal.PtrToStringUni(nativeFolderDefinition.name);
this.Description = Marshal.PtrToStringUni(nativeFolderDefinition.description);
this.ParentId = nativeFolderDefinition.parentId;
this.RelativePath = Marshal.PtrToStringUni(nativeFolderDefinition.relativePath);
this.ParsingName = Marshal.PtrToStringUni(nativeFolderDefinition.parsingName);
this.TooltipResourceId = Marshal.PtrToStringUni(nativeFolderDefinition.tooltip);
this.LocalizedNameResourceId = Marshal.PtrToStringUni(nativeFolderDefinition.localizedName);
this.IconResourceId = Marshal.PtrToStringUni(nativeFolderDefinition.icon);
this.Security = Marshal.PtrToStringUni(nativeFolderDefinition.security);
this.FileAttributes = (System.IO.FileAttributes)nativeFolderDefinition.attributes;
this.DefinitionOptions = nativeFolderDefinition.definitionOptions;
this.FolderTypeId = nativeFolderDefinition.folderTypeId;
////knownFolderProperties.folderType = FolderTypes.GetFolderType(knownFolderProperties.folderTypeId);
this.Redirection = knownFolderNative.GetRedirectionCapabilities();
// Turn tooltip, localized name and icon resource IDs
// into the actual resources.
this.Tooltip = GetStringResource(this.TooltipResourceId);
this.LocalizedName = GetStringResource(this.LocalizedNameResourceId);
this.FolderId = knownFolderNative.GetId();
bool pathExists = false;
this.IsExistsInFileSystem = false;
this.IsPathExists = false;
this.PidlIdList = null;
using (var kfObj = new KnownFolderNative(knownFolderNative))
{
if (kfObj != null)
{
try
{
bool?isExists = kfObj.IsFileSystem();
if (isExists != null)
{
if (isExists == true)
{
this.IsExistsInFileSystem = true;
}
this.Path = KnownFolderHelper.GetPath(out pathExists, knownFolderNative);
this.IsPathExists = pathExists;
}
}
catch
{
// Catch this just in case
}
try
{
this.PidlIdList = kfObj.KnownFolderToIdList();
}
catch
{
// Catch this just in case
}
}
}
// Load Icon ResourceId from Icon Resource helper (if not already present)
if (IsIconResourceIdValid(IconResourceId) == false && PidlIdList != null)
{
if (PidlIdList.Size == 0 && this.FolderId == new Guid(KF_ID.ID_FOLDERID_Desktop))
{
IconResourceId = IconHelper.FromPidl(PidlIdList, true, false);
}
else
{
if (PidlIdList.Size != 0)
{
IconResourceId = IconHelper.FromPidl(PidlIdList, true, false);
}
}
}
}
