internal bool TryGetEvent(string name, out ComEventDesc @event) {
name = name.ToUpper(System.Globalization.CultureInfo.InvariantCulture);
return _events.TryGetValue(name, out @event);
}
private static void ScanSourceInterface(ComTypes.ITypeInfo sourceTypeInfo, ref Dictionary<string, ComEventDesc> events) {
ComTypes.TYPEATTR sourceTypeAttribute = ComRuntimeHelpers.GetTypeAttrForTypeInfo(sourceTypeInfo);
for (int index = 0; index < sourceTypeAttribute.cFuncs; index++) {
IntPtr funcDescHandleToRelease = IntPtr.Zero;
try {
ComTypes.FUNCDESC funcDesc;
GetFuncDescForDescIndex(sourceTypeInfo, index, out funcDesc, out funcDescHandleToRelease);
// we are not interested in hidden or restricted functions for now.
if ((funcDesc.wFuncFlags & (int)ComTypes.FUNCFLAGS.FUNCFLAG_FHIDDEN) != 0) {
continue;
}
if ((funcDesc.wFuncFlags & (int)ComTypes.FUNCFLAGS.FUNCFLAG_FRESTRICTED) != 0) {
continue;
}
string name = ComRuntimeHelpers.GetNameOfMethod(sourceTypeInfo, funcDesc.memid);
name = name.ToUpper(System.Globalization.CultureInfo.InvariantCulture);
// Sometimes coclass has multiple source interfaces. Usually this is caused by
// adding new events and putting them on new interfaces while keeping the
// old interfaces around. This may cause name collisioning which we are
// resolving by keeping only the first event with the same name.
if (events.ContainsKey(name) == false) {
ComEventDesc eventDesc = new ComEventDesc();
eventDesc.dispid = funcDesc.memid;
eventDesc.sourceIID = sourceTypeAttribute.guid;
events.Add(name, eventDesc);
}
} finally {
if (funcDescHandleToRelease != IntPtr.Zero) {
sourceTypeInfo.ReleaseFuncDesc(funcDescHandleToRelease);
}
}
}
}
private DynamicMetaObject BindEvent(ComEventDesc @event) {
// BoundDispEvent CreateComEvent(object rcw, Guid sourceIid, int dispid)
Expression result =
Expression.Call(
typeof(ComRuntimeHelpers).GetMethod("CreateComEvent"),
ComObject.RcwFromComObject(Expression),
Expression.Constant(@event.sourceIID),
Expression.Constant(@event.dispid)
);
return new DynamicMetaObject(
result,
IDispatchRestriction()
);
}
internal bool TryGetMemberEvent(string name, out ComEventDesc @event) {
EnsureScanDefinedEvents();
return _comTypeDesc.TryGetEvent(name, out @event);
}