Showing tag results for Code

A customer reported that they were receiving some assertion failures because the function was failing with what they believed to be a valid heap block, and the function reported that the reason for failure was . What's going on? One of my colleagues asked the psychic question, "Is the process exiting?" "Why yes, in fact it is. How did you know?...

When the function receives a reason code of , the increasingly-inaccurately-named parameter to is used to indicate whether the process is exiting. And if the process is exiting, then you should just return without doing anything. No, really. Don't worry about freeing memory; it will all go away when the process address space is destroyed. Don...

Last week we looked at menu drag/drop. Another little-used menu feature added in Windows 2000 is the ability to show context menus on menus. The message is and the flag is . Let's demonstrate with a simple program. Start with the scratch program, and add the function just so our context menu can do something. When we receive the me...

In order to do drag-drop rearrangement of menus, you need four things, most of which we already know how to do. Dragging an item out of a menu. Check. Dropping an item into a menu. Check. Connecting the drag with the drop. Rearranging menu items in response to the operation. Let's do step 4 first, just to mix things up. ...

Last time, we looked at using the style for dragging items out of a menu. Today, we'll look at dropping them in. Take the program from last time and make the following additions. First, let's add a second item to the menu. Yes, I hard-coded another path. This is a demo, not production code. Anyway, it's time to hook up the message: To...

Windows 2000 introduced the menu style, which permits drag/drop operations in a menu. Nobody uses this style, probably because it's totally undiscoverable by the end-user. But I'll write a sample program anyway. Mind you, I knew nothing about the menu style until I started writing this entry. But I simply read the documentation, which say...

Over the years, I've seen a bunch of coding anti-patterns. I figured maybe I'll share a few. Today, I'll introduce what I'm calling the for-if anti-pattern, also known as "We'll sell you the whole seat, but you'll only need the edge." This is a special case of the for-case anti-pattern, where all but one of the cases is null. This can natural...

A customer was having trouble obtaining information from a shortcut file. "Here is a sample program that tries to print the target of a shortcut file, but it only gets the file name without a directory. How do I get the full path?" Recall that the structure contains only a file name in the member. It doesn't have any path information. The st...

Given an , how does one determine whether the language lays out left-to-right or right-to-left? One suggestion was simply to hard-code the list of known right-to-left languages, and if the language isn't on the list, then assume that it is left-to-right. This technique is clearly fragile, because Windows adds support for new languages not infrequen...

There is a class of messages which are generated on demand rather than explicitly posted into a message queue. If you call or and the queue is empty, then the window manager will look to see if one of these generated-on-demand messages is due, messages like , , and . Neil wonders, "In that program that called 100,000 times, how many paint messa...