internal ComTypeDesc(ITypeInfo typeInfo, ComTypeLibDesc typeLibDesc)
{
if (typeInfo != null)
{
ComRuntimeHelpers.GetInfoFromType(typeInfo, out _typeName, out _documentation);
}
TypeLib = typeLibDesc;
}
internal ComTypeClassDesc(ComTypes.ITypeInfo typeInfo, ComTypeLibDesc typeLibDesc) :
base(typeInfo, typeLibDesc)
{
ComTypes.TYPEATTR typeAttr = ComRuntimeHelpers.GetTypeAttrForTypeInfo(typeInfo);
Guid = typeAttr.guid;
for (int i = 0; i < typeAttr.cImplTypes; i++)
{
typeInfo.GetRefTypeOfImplType(i, out int hRefType);
typeInfo.GetRefTypeInfo(hRefType, out ComTypes.ITypeInfo currentTypeInfo);
typeInfo.GetImplTypeFlags(i, out ComTypes.IMPLTYPEFLAGS implTypeFlags);
bool isSourceItf = (implTypeFlags & ComTypes.IMPLTYPEFLAGS.IMPLTYPEFLAG_FSOURCE) != 0;
AddInterface(currentTypeInfo, isSourceItf);
}
}
private static ComTypes.ITypeInfo GetCoClassTypeInfo(object rcw, ComTypes.ITypeInfo typeInfo)
{
Debug.Assert(typeInfo != null);
if (rcw is IProvideClassInfo provideClassInfo)
{
IntPtr typeInfoPtr = IntPtr.Zero;
try
{
provideClassInfo.GetClassInfo(out typeInfoPtr);
if (typeInfoPtr != IntPtr.Zero)
{
return(Marshal.GetObjectForIUnknown(typeInfoPtr) as ComTypes.ITypeInfo);
}
}
finally
{
if (typeInfoPtr != IntPtr.Zero)
{
Marshal.Release(typeInfoPtr);
}
}
}
// retrieving class information through IPCI has failed -
// we can try scanning the typelib to find the coclass
typeInfo.GetContainingTypeLib(out ComTypes.ITypeLib typeLib, out int _);
string typeName = ComRuntimeHelpers.GetNameOfType(typeInfo);
ComTypeLibDesc typeLibDesc = ComTypeLibDesc.GetFromTypeLib(typeLib);
ComTypeClassDesc coclassDesc = typeLibDesc.GetCoClassForInterface(typeName);
if (coclassDesc == null)
{
return(null);
}
Guid coclassGuid = coclassDesc.Guid;
typeLib.GetTypeInfoOfGuid(ref coclassGuid, out ComTypes.ITypeInfo typeInfoCoClass);
return(typeInfoCoClass);
}
internal ComTypeEnumDesc(ComTypes.ITypeInfo typeInfo, ComTypeLibDesc typeLibDesc) :
base(typeInfo, typeLibDesc)
{
ComTypes.TYPEATTR typeAttr = ComRuntimeHelpers.GetTypeAttrForTypeInfo(typeInfo);
string[] memberNames = new string[typeAttr.cVars];
object[] memberValues = new object[typeAttr.cVars];
IntPtr p;
// For each enum member get name and value.
for (int i = 0; i < typeAttr.cVars; i++)
{
typeInfo.GetVarDesc(i, out p);
// Get the enum member value (as object).
ComTypes.VARDESC varDesc;
try
{
varDesc = (ComTypes.VARDESC)Marshal.PtrToStructure(p, typeof(ComTypes.VARDESC));
if (varDesc.varkind == ComTypes.VARKIND.VAR_CONST)
{
memberValues[i] = Marshal.GetObjectForNativeVariant(varDesc.desc.lpvarValue);
}
}
finally
{
typeInfo.ReleaseVarDesc(p);
}
// Get the enum member name
memberNames[i] = ComRuntimeHelpers.GetNameOfMethod(typeInfo, varDesc.memid);
}
_memberNames = memberNames;
_memberValues = memberValues;
}
internal static ComTypeLibDesc GetFromTypeLib(ComTypes.ITypeLib typeLib)
{
// check whether we have already loaded this type library
ComTypes.TYPELIBATTR typeLibAttr = ComRuntimeHelpers.GetTypeAttrForTypeLib(typeLib);
ComTypeLibDesc typeLibDesc;
lock (s_cachedTypeLibDesc)
{
if (s_cachedTypeLibDesc.TryGetValue(typeLibAttr.guid, out typeLibDesc))
{
return(typeLibDesc);
}
}
typeLibDesc = new ComTypeLibDesc
{
Name = ComRuntimeHelpers.GetNameOfLib(typeLib),
_typeLibAttributes = typeLibAttr
};
int countTypes = typeLib.GetTypeInfoCount();
for (int i = 0; i < countTypes; i++)
{
typeLib.GetTypeInfoType(i, out ComTypes.TYPEKIND typeKind);
typeLib.GetTypeInfo(i, out ComTypes.ITypeInfo typeInfo);
if (typeKind == ComTypes.TYPEKIND.TKIND_COCLASS)
{
ComTypeClassDesc classDesc = new ComTypeClassDesc(typeInfo, typeLibDesc);
typeLibDesc._classes.AddLast(classDesc);
}
else if (typeKind == ComTypes.TYPEKIND.TKIND_ENUM)
{
ComTypeEnumDesc enumDesc = new ComTypeEnumDesc(typeInfo, typeLibDesc);
typeLibDesc._enums.Add(enumDesc.TypeName, enumDesc);
}
else if (typeKind == ComTypes.TYPEKIND.TKIND_ALIAS)
{
ComTypes.TYPEATTR typeAttr = ComRuntimeHelpers.GetTypeAttrForTypeInfo(typeInfo);
if (typeAttr.tdescAlias.vt == (short)VarEnum.VT_USERDEFINED)
{
ComRuntimeHelpers.GetInfoFromType(typeInfo, out string aliasName, out _);
typeInfo.GetRefTypeInfo(typeAttr.tdescAlias.lpValue.ToInt32(), out ComTypes.ITypeInfo referencedTypeInfo);
ComTypes.TYPEATTR referencedTypeAttr = ComRuntimeHelpers.GetTypeAttrForTypeInfo(referencedTypeInfo);
ComTypes.TYPEKIND referencedTypeKind = referencedTypeAttr.typekind;
if (referencedTypeKind == ComTypes.TYPEKIND.TKIND_ENUM)
{
ComTypeEnumDesc enumDesc = new ComTypeEnumDesc(referencedTypeInfo, typeLibDesc);
typeLibDesc._enums.Add(aliasName, enumDesc);
}
}
}
}
// cached the typelib using the guid as the dictionary key
lock (s_cachedTypeLibDesc)
{
s_cachedTypeLibDesc.Add(typeLibAttr.guid, typeLibDesc);
}
return(typeLibDesc);
}
internal TypeLibMetaObject(Expression expression, ComTypeLibDesc lib)
: base(expression, BindingRestrictions.Empty, lib)
{
_lib = lib;
}