private void EnsureScanDefinedEvents()
{
// _comTypeDesc.Events is null if we have not yet attempted
// to scan the object for events.
if (_comTypeDesc != null && _comTypeDesc.Events != null)
{
return;
}
// check type info in the type descriptions cache
ComTypes.ITypeInfo typeInfo = ComRuntimeHelpers.GetITypeInfoFromIDispatch(_dispatchObject, true);
if (typeInfo == null)
{
_comTypeDesc = ComTypeDesc.CreateEmptyTypeDesc();
return;
}
ComTypes.TYPEATTR typeAttr = ComRuntimeHelpers.GetTypeAttrForTypeInfo(typeInfo);
if (_comTypeDesc == null)
{
lock (_CacheComTypeDesc) {
if (_CacheComTypeDesc.TryGetValue(typeAttr.guid, out _comTypeDesc) == true &&
_comTypeDesc.Events != null)
{
return;
}
}
}
ComTypeDesc typeDesc = ComTypeDesc.FromITypeInfo(typeInfo, typeAttr);
ComTypes.ITypeInfo classTypeInfo = null;
Dictionary <string, ComEventDesc> events = null;
var cpc = RuntimeCallableWrapper as ComTypes.IConnectionPointContainer;
if (cpc == null)
{
// No ICPC - this object does not support events
events = ComTypeDesc.EmptyEvents;
}
else if ((classTypeInfo = GetCoClassTypeInfo(this.RuntimeCallableWrapper, typeInfo)) == null)
{
// no class info found - this object may support events
// but we could not discover those
events = ComTypeDesc.EmptyEvents;
}
else
{
events = new Dictionary <string, ComEventDesc>();
ComTypes.TYPEATTR classTypeAttr = ComRuntimeHelpers.GetTypeAttrForTypeInfo(classTypeInfo);
for (int i = 0; i < classTypeAttr.cImplTypes; i++)
{
int hRefType;
classTypeInfo.GetRefTypeOfImplType(i, out hRefType);
ComTypes.ITypeInfo interfaceTypeInfo;
classTypeInfo.GetRefTypeInfo(hRefType, out interfaceTypeInfo);
ComTypes.IMPLTYPEFLAGS flags;
classTypeInfo.GetImplTypeFlags(i, out flags);
if ((flags & ComTypes.IMPLTYPEFLAGS.IMPLTYPEFLAG_FSOURCE) != 0)
{
ScanSourceInterface(interfaceTypeInfo, ref events);
}
}
if (events.Count == 0)
{
events = ComTypeDesc.EmptyEvents;
}
}
lock (_CacheComTypeDesc) {
ComTypeDesc cachedTypeDesc;
if (_CacheComTypeDesc.TryGetValue(typeAttr.guid, out cachedTypeDesc))
{
_comTypeDesc = cachedTypeDesc;
}
else
{
_comTypeDesc = typeDesc;
_CacheComTypeDesc.Add(typeAttr.guid, _comTypeDesc);
}
_comTypeDesc.Events = events;
}
}
