public static Type GetTypeOrTypeInfo(this object value)
{
var type = value.GetType();
IDispatch dispatch = null;
Type typeInfo = null;
TYPEKIND typeInfoKind = 0;
TYPEFLAGS typeInfoFlags = 0;
if (type.IsUnknownCOMObject())
{
// This appears to be a generic COM object with no specific type information.
// Attempt to acquire COM type information via IDispatch or IProvideClassInfo.
dispatch = value as IDispatch;
if (dispatch != null)
{
uint count;
if (RawCOMHelpers.HResult.Succeeded(dispatch.GetTypeInfoCount(out count)) && (count > 0))
{
ITypeInfo tempTypeInfo;
if (RawCOMHelpers.HResult.Succeeded(dispatch.GetTypeInfo(0, 0, out tempTypeInfo)))
{
typeInfo = GetTypeForTypeInfo(tempTypeInfo);
typeInfoKind = GetTypeInfoKind(tempTypeInfo);
typeInfoFlags = GetTypeInfoFlags(tempTypeInfo);
}
}
}
if (typeInfo == null)
{
var provideClassInfo = value as IProvideClassInfo;
if (provideClassInfo != null)
{
ITypeInfo tempTypeInfo;
if (RawCOMHelpers.HResult.Succeeded(provideClassInfo.GetClassInfo(out tempTypeInfo)))
{
typeInfo = GetTypeForTypeInfo(tempTypeInfo);
typeInfoKind = GetTypeInfoKind(tempTypeInfo);
typeInfoFlags = GetTypeInfoFlags(tempTypeInfo);
}
}
}
}
if (typeInfo != null)
{
// If the COM type is a dispatch-only interface, use it. Such interfaces typically
// aren't exposed via QueryInterface(), so there's no way to validate them anyway.
if ((dispatch != null) && (typeInfoKind == TYPEKIND.TKIND_DISPATCH) && typeInfoFlags.HasFlag(TYPEFLAGS.TYPEFLAG_FDISPATCHABLE) && !typeInfoFlags.HasFlag(TYPEFLAGS.TYPEFLAG_FDUAL))
{
return(typeInfo);
}
// COM type information acquired in this manner may not actually be valid for the
// original object. In some cases the original object implements a base interface.
if (typeInfo.IsInstanceOfType(value))
{
return(typeInfo);
}
foreach (var interfaceType in typeInfo.GetInterfaces())
{
if (interfaceType.IsInstanceOfType(value))
{
return(interfaceType);
}
}
}
return(type);
}
private static void AppendTypeAttribute(DescriptionBuilder sb, TYPEATTR typeAttr, TYPEFLAGS attribute)
{
if ((typeAttr.wTypeFlags & attribute) == attribute)
{
sb.Append(", ");
sb.Append(ComBrowserSettings.GetKeyword(attribute));
}
}