Showing tag results for Code

It has its ups and downs.

When the listview control asks you for an infotip, it sends you then notification, and when you return, the result is displayed as the infotip. But what if computing the infotip takes a long time? You don't want to stall the UI thread on a long operation, after all. This is where comes in. If you want to say, "Um, I'm not ready with that infot...

When displaying infotips for listview items, you have to deal with both the folded and unfolded case. "Folded" is the term used to describe a listview item in large icon mode whose text has been truncated due to length. When the user selects the item, the full text is revealed, a process known as "unfolding". Take our scratch program and make t...

Nobody can make any progress because they keep getting stuck.

One of the more subtle ways people mess up is returning when the problem wasn't actually an unsupported interface. The return value has very specific meaning. Do not use it as your generic "gosh, something went wrong" error. (Use an appropriate error such as or .) Recall that the rules for are that (in the absence of catastrophic errors such...

Although the function is documented in the Platform SDK, it's not really part of the platform. Rather, is the conventional name for the user-provided entry point to a Windows program. The real entry point is in the C runtime library, which initializes the runtime, runs global constructors, and then calls your function (or if you prefer a...

If you want to register a window class and use a system color as its background color, you set the member to the desired color, plus one, cast to an : Windows 95 introduced "system color brushes", which are a magic type of brush which always paint in the corresponding system color, even if the system color changes. The brush will alwa...

It's just WM_SETCURSOR, but that in itself is rather complicated.

"Worst software ever." That was Aaron Zupancic's cousin's reaction to the fact that Windows XP was incompatible with one program originally designed for Windows 98. Then again, commenter Aargh! says "The bad code should be fixed, period. If it can't be fixed, it breaks, too bad." Perhaps Aargh! can send a message to Aaron's cousin sa...

When doing dithering, one operation you have to do for every pixel is map it (more accurately, map a modified version of it) to the nearest color in your available palette. Since this is part of the dithering inner loop, you need this operation to be as fast as possible.¹ A common technique for this is to precompute the nearest palette index ...