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Commenter 8 wants to know how to tell the function to use an existing instead of pointing it to an icon resource. You can't. The loads the icon itself. You can't hand it a pre-loaded icon. Of course, it's hardly rocket science to write your own function that lets you use whatever icon you want. There's no law that says all Yes/No dialo...

Last time, we learned about the dangers of uninitialized floating point variables but left with a puzzle: Why wasn't this caught during internal testing? I dropped a hint when I described how s work: You have to ask the processor to raise an exception when it encounters a signaling NaN, and the program disabled that exception. Why was an excepti...

A colleague of mine related to me this story about uninitialized floating point variables. He had a function that went something like this, simplified for expository purposes. The infoType parameter specified which piece of information you're requesting, and depending on what you're asking for, one or the other of the output parameters may not con...

Half of a GUID is worse than none.

It's great when you have a tool to make programming easier, but you still must understand what it does or you're just replacing one set of problems with another set of more subtle problems. For example, we discussed earlier the importance of knowing when your destructor runs. Here's another example, courtesy of my colleague Chris Ashton. This was...

Commenter Chris Becke asks how the common controls convert ANSI parameters to Unicode, since the common controls are Unicode internally. Everything goes through , pretty much by definition. The ANSI code page is . That's what ACP stands for, after all. Now, there are some function families that do not use ANSI. The console subsystem, for example...

There are many situations where you pass a structure to a function, and the function fills in the structure with information you request. In some cases, the function always fills in the entire structure (example: ). In other cases, you tell the function which bits of information you care about, to save the function the effort of computing somethin...

This is really just a corollary to Why are DLLs unloaded in the "wrong" order. Exactly the same logic that explains why DLLs are unloaded in the "wrong" order also explains why they are uninitialized in the "wrong" order. Once you understand the first issue, the second comes for free; just change to in your analysis. Apply the logic to the sc...

A customer noticed that if you add three to a process ID and pass it to the function, it still succeeds. Why is that? Well, first of all, I need to say up front that the behavior you're seeing is an artifact of the implementation and is not part of the contract. You're passing intentionally invalid parameters, what did you expect? The context of...

In the suggestion box, Serge Wautier asked why accelerators for hidden controls remain active. He's apparently rather insistent because he asked the question again a few months later. Asking the same question multiple times reduces the likelihood that I'll answer it. Consider yourself lucky that I wrote this answer before I noticed the duplicate...