How can I tell if a file is an image of some type?

April 30, 2015 Apr 30, 2015 04/30/15

Raymond C

The perceived type tells you what kind of file it is, for a very general sense of the word "kind".

Is the atom returned by RegisterClass(Ex) a "real" atom?

April 29, 2015 Apr 29, 2015 04/29/15

Raymond C

A customer was debugging some code that calls Register­Class on a class that's already been registered. In this case, it was registered by another DLL in the same process. Normally, this wouldn't be a problem, because each DLL passes its own instance handle to Register­Class so that there are no name collisions. However, in this case...

How do I extract the path to Control Panel from this shortcut so I can launch it?

April 27, 2015 Apr 27, 2015 04/27/15

Raymond C

You don't need to.

Why can't I have variadic COM methods?

April 24, 2015 Apr 24, 2015 04/24/15

Raymond C

COM methods cannot be variadic. Why not? Answer: Because the marshaler doesn't know when to stop. Suppose variadic COM methods were possible. And then you wrote this code: How would COM know how to marshal this function call? In other words, suppose that variadic is a pointer to a proxy that refers to an object in another process. The ...