The Old New Thing

April 2015 - The Old New Thing

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

April 29, 2015 Apr 29, 2015 04/29/15
Raymond Chen
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...
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Access to a file's attributes is controlled by two things

April 28, 2015 Apr 28, 2015 04/28/15
Raymond Chen
We saw some time ago that permission to delete a file is granted either File attributes behave in an analogous way. Permission to read a file's attributes is granted either If you want the file's attributes, you could always get it by reading the directory, because one of the pieces of information you get from Find­First­File ...

Why can't I have variadic COM methods?

April 24, 2015 Apr 24, 2015 04/24/15
Raymond Chen
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 ...
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