public static String RetrieveAssociatedIcon([NotNull] String extensionOrFileOrProtocol, [CanBeNull] out Int32?identifier, out IconIdentifierType identifierType)
{
if (String.IsNullOrWhiteSpace(extensionOrFileOrProtocol))
{
throw new ArgumentNullException(nameof(extensionOrFileOrProtocol));
}
identifier = null;
identifierType = IconIdentifierType.Unknown;
// Special case: The result buffer contains "%1". We treat this case like: "oh hey, your supplied file path is already the file containing the icon!".
var result = SafeNativeMethods.AssocQueryString(extensionOrFileOrProtocol, NativeMethods.ASSOCSTR.ASSOCSTR_DEFAULTICON);
if (result == "%1")
{
return(String.Empty);
}
if (result.IndexOf(',') == -1)
{
identifier = 0;
identifierType = IconIdentifierType.Index;
return(result);
}
Int32 extractedIdentifier;
var file = NativeResourceDescriptor.SplitResourceString(result, out extractedIdentifier);
identifier = extractedIdentifier;
identifierType = IconIdentifier.Identify(extractedIdentifier);
return(file);
}
public static NativeResourceDescriptor ParseFromResourceString(String resourceString)
{
try
{
Int32 identifier;
var file = NativeResourceDescriptor.SplitResourceString(resourceString, out identifier);
return(new NativeResourceDescriptor(file, (UInt32)Math.Abs(identifier)));
}
catch (Exception ex)
{
throw new InvalidOperationException($"Cannot parse '{resourceString}' to NativeResourceDescriptor.", ex);
}
}
