Showing tag results for Code

Jonathan Wilson asks why the clipboard APIs still require GlobalAlloc and friends. Why is there not a or something that does what does but without needing to call ? Okay, here's your function: Whoop-dee-doo. Historically, Windows doesn't go out of its way to include functions like this because you can easily write them yourself, or you ...

It turns out that my quick overview of how processes exit on Windows XP was already out of date when I wrote it. Mind you, the information is still accurate for Windows XP (as far as I know), but the rules changed in Windows Vista. What about critical sections? There is no "Uh-oh" return value for critical sections; doesn't have a...

A colleague of mine showed me some code from a back-end program on a web server. Fortunately, the company that wrote this is out of business. Or at least I hope they're out of business!

Jeffrey Riaboy asks why, if he renames a function in his DEF file, attempts to link to the function by its old name fail. Well, um, yeah, because you renamed it. Let's take the situation apart a bit; maybe it'll make more sense. I'm going to ignore a lot of details (, calling conventions) since they are not relevant to the discussion and wou...

As you are I'm sure aware, you shouldn't be doing much of anything in your function, but you have to watch out for cases where you end up doing them accidentally. Some time ago, I was investigating a failure which was traced back to loading a DLL inside . Wait, what kind of insane person loads a DLL as part of shutting down? Shouldn't you be cl...

A customer had the following problem: We're calling to retrieve the command line, and the documentation says that it returns a single null-terminated string. However, when we call it in our application, we find that it is actually a double-null-terminated string. The buffer returned consists of a series of null-terminated strings, one string per ...

The function creates a special type of bitmap known as a DIB section. We've worked with these guys before: The feature of DIB sections that is by far the most interesting is that the raw pixels in the bitmap are mapped into your process space as if they were normal memory, which you can read from and write to directly. But what is the deal with...

We saw last time that the COM rules for output pointers are that they must be initialized on return from a function, even if the function fails. The COM marshaller relies on this behavior, but then again, so do you; you just don't realize it yet. If you use a smart pointer library (be it ATL or boost or whatever), you are still relying on output...

One of the rules of COM is that if a parameter is marked as an output pointer, then you have to initialize the thing it points to, even if your function failed and you have nothing to return. For example, we saw the problems that can occur if you forget to set the output pointer to in the method. Why does COM have this rule? Doesn't it know that...

In response to a discussion of why the window handle limit is 10,000, commenter Juan wondered why we don't create a special class of programs which can exceed the 10,000 handle limit and otherwise bypass the normal operation of the system. This is another case of the tragedy of special treatment: Eventually, nothing is special any more. If ther...