Exercise: Why do we use the formula instead of the simpler ? Answer: To avoid integer overflow in the computation of . Here, and are window coordinates, and the window can be anywhere. If the window were placed at extreme coordinates like (MAXLONG,MAXLONG), then the arithm...
Now that we have learned about the intricacies of the message, we can use it to get rid of the flicker in our resizing code. We just take the trick we used above and apply it to the scroll program. First, we need to get rid of the bad flickery resize, so return the OnWindowPosChanging function ...
Because we tried it the other way and it was much worse. In 16-bit Windows, a module that didn't satisfy all its imports would still load. As long as you didn't call a missing import, you were fine. If you did try to call a missing import, you crashed pretty spectacularly with the dreaded U...
The other form of the message is the complicated one, when the is . In this case, the is a pointer to a structure. When Windows sends the message, the structure is filled out like this: Notice that the client rectangle is given in parent coo...
Eric Lippert has posted Eric's Complete Guide to BSTR Semantics. This is a document that is widely valued within Microsoft, since BSTR semantics are rather tricky, and I'm glad he's willing to share it with the world. In particular, Eric spends quite a bit of time discussion the very important...
Behold the power of milk. Or something. Here's another milk-related bug report from Paul Vick. Paul also has a bug report that challenges the philosophical underpinnings of the eventing model.
Joe Beda stopped by my office, clutching a stack of documents he had just had notarized, and told me, "Raymond, you should become a notary public." "Why?" "It'd be fun." "Notarizing documents is fun?" "No, just being a notary public - just know...
Answers to exercises from Scrollbars Part 10.
Whimsical bug reports, while not a common occurence, aren't exactly unheard of either. They are a popular way to vent a shared frustration and lighten the mood. Recently, we changed milk suppliers for our cafeterias. Well, more accurately, our previous milk supplier was bought by another milk company...
The original taskbar didn't look at all like what you see today. It defaulted to the top of the screen.
