/// <summary>
/// Synchronous getter of an icon for PowerItem
/// </summary>
/// <param name="item">PowerItem we need icon extracted for</param>
/// <param name="iconNeeded">type of icon needed - small or large</param>
/// <returns>ImageContainer with ImageSources extracted. Can be null.</returns>
public static ImageContainer GetImageContainerSync(PowerItem item, API.Shgfi iconNeeded)
{
Log.Raw("begin>>>>>>>>>>>>>>>", item.FriendlyName);
//Checking if there's cached ImageContainer
string resolvedArg, descr;
try
{
resolvedArg = PowerItemTree.GetResolvedArgument(item);
descr = GetObjectDescriptor(item, resolvedArg);
}
catch (IOException)
{
return null;
}
lock (Cache)
{
var container = (ImageContainer)(Cache.ContainsKey(descr) ? Cache[descr] : null);
Log.Fmt("arg<={0}, descr<={1}, container<={2}", resolvedArg, descr,
(container != null ? "not " : "") + "null");
if (container == null) //No cached instance
{
container = new ImageContainer(resolvedArg, descr, item.SpecialFolderId);
Cache.Add(descr, container);
if (iconNeeded == API.Shgfi.SMALLICON)
container.ExtractSmall();
else
container.ExtractLarge();
}
#if DEBUG
Log.Raw("end<<<<<<<<<<<<<<", item.FriendlyName);
#endif
return container;
}
}
/// <summary>
/// Returns HICON of provided size (or of default size if requested one isn't available)
/// </summary>
/// <param name="iconType"></param>
private IntPtr GetUnmanagedIcon(API.Shgfi iconType)
{
Log.Raw("begin", _initialObject);
//Way 1, straightforward: "Hey shell, give me an icon for that file!"
var shinfo = new API.ShfileinfoW();
var zeroFails = API.SHGetFileInfo(_initialObject, 0, ref shinfo, (uint) Marshal.SizeOf(shinfo), API.Shgfi.ICON | iconType);
Log.Raw("ShGetFileInfo returned " + zeroFails);
if (zeroFails == IntPtr.Zero) //lot of stuff will work via this
{
//Shell failed
//Way 2: way around: "Hey registry, and how should display the stuff of a kind?"
var temp = Util.GetDefaultIconResourceIdForClass(_initialObject);
Log.Raw("GetDefaultIconResourceIdForClass returned " + (temp ?? "NULL!!"));
if (!string.IsNullOrEmpty(temp))
{
zeroFails = Util.ResolveIconicResource(temp);
Log.Raw("ResolveIconicResource returned " + zeroFails);
}
if(zeroFails != IntPtr.Zero)//ResolveIconicResource() succeeded and zeroFails contains required handle
{
shinfo.hIcon = zeroFails;
}
else if (_id != API.Csidl.INVALID)//For PowerItems initialized without argument but with folderId
{//No icon, or Registry doesn't know
//Way 3, cumbersome: "Hey shell, I know that stuff means something for ya. Give me the icon for the thing this staff means!"
var ppIdl = IntPtr.Zero;
var hRes = API.SHGetSpecialFolderLocation(IntPtr.Zero, _id, ref ppIdl); //I know, obsolete, but works ;)
Log.Fmt("SHGetSp.F.Loc. for id<={0} returned result code {1}", _id, hRes);
zeroFails = (hRes != 0
? IntPtr.Zero
: API.SHGetFileInfo(ppIdl, 0, ref shinfo, (uint) Marshal.SizeOf(shinfo),
API.Shgfi.ICON | API.Shgfi.PIDL | API.Shgfi.USEFILEATTRIBUTES | iconType));
Marshal.FreeCoTaskMem(ppIdl);
Log.Raw("ShGetFileInfo (2p) returned " + zeroFails);
}
}
Log.Fmt("end<<<<<, zf={0}, hi={1}", zeroFails, shinfo.hIcon);
return zeroFails == IntPtr.Zero || shinfo.hIcon == IntPtr.Zero ? IntPtr.Zero : shinfo.hIcon;
}
/// <summary>
/// Starts asynchronous extraction of ImageContainer for PowerItem
/// </summary>
/// <param name="item">PowerItem we need icon extracted for</param>
/// <param name="iconNeeded">type of icon needed - small or large</param>
/// <returns>Always null</returns>
public static ImageContainer GetImageContainer(PowerItem item, API.Shgfi iconNeeded)
{
ImageQueue.Enqueue(new Tuple<PowerItem, API.Shgfi>(item, iconNeeded));
return null;
}
/// <summary>
/// Constructs the instance of ImageContainer from data from PowerItem
/// </summary>
/// <param name="objectToGetIcons">Path to file or special object</param>
/// <param name="typeDescriptor">Tag that will be set in cache for this ImageContainer. Used for debugging.</param>
/// <param name="specialId">SpecialFolderId from source PowerItem</param>
public ImageContainer(string objectToGetIcons, string typeDescriptor, API.Csidl specialId)
{
_initialObject = objectToGetIcons;
_objectDescriptor = typeDescriptor;
_id = specialId;
}
