/// <summary>
/// Takes a COM object, and reads the unmanaged memory given by its pointer, allowing us to read internal fields
/// </summary>
/// <typeparam name="T">the type of structure to return</typeparam>
/// <param name="comObj">the COM object</param>
/// <returns>the requested structure T</returns>
public static T ReadComObjectStructure <T>(object comObj)
{
// Reads a COM object as a structure to copy its internal fields
if (!RdMarshal.IsComObject(comObj))
{
throw new ArgumentException("Expected a COM object");
}
var referencesPtr = RdMarshal.GetIUnknownForObjectInContext(comObj);
if (referencesPtr == IntPtr.Zero)
{
throw new InvalidOperationException("Cannot access the TypeLib API from this thread. TypeLib API must be accessed from the main thread.");
}
var retVal = ReadStructureSafe <T>(referencesPtr);
RdMarshal.Release(referencesPtr);
return(retVal);
}