Showing tag results for Code

A customer reported a problem with the function: I have a DLL with an function and an function. The code goes like this: Under certain conditions, the function is called twice, and the function is correspondingly called twice. Under these conditions, if I run the code on a single-processor system with hyperthreading disabled, then every...

A colleague needed some help with manipulating s. I have some generic code to execute WMI queries and store the result as strings. Normally, does the work, but doesn't know how to convert arrays (e.g. ). And there doesn't seem to be an easy way to convert the array element-by-element because expects a pointer to an object of the underlying ty...

A customer wanted to invoke a command on multiple items at once. I have an , and I want to invoke a verb with that array as the parameter. I know that I can invoke a verb on a single by the code below, but how do I pass an entire array? The function invokes the command by extracting the pidl, then asking to invoke the command on the pidl...

Dewi Morgan reinterpreted a question from a Suggestion Box of times past as "How do you deal with an input stream that may or may not contain Unicode data?" A related question from Dave wondered how applications that use to store data could ensure that the data is interpreted in the same code page by the recipient. "If I send a .txt file to a per...

A customer observed that once the user visited their shell extension, Explorer ran really slowly. (Actually, it took a while just to get to this point, but I'll skip the early investigations because they aren't relevant to the story.) Some investigation showed that Explorer's tree view was calling into the shell extension, which was in turn hanging...

Chris Hill suggests discussing the use of structured exception handling as it relates to the window manager, and specifically the implications for applications which raise exceptions from a callback. If you plan on raising an exception and handling it in a function higher up the stack, all the stack frames in between need to be be in on your li...

A customer was attempting to study a problem that their analysis traced back to the function returning . Is it a valid conclusion that there is no heap corruption? While heap corruption may not be the avenue of investigation you'd first pursue, you can't rule it out. In the presence of a total breakdown of normal functioning, anything can happ...

A customer encountered the following problem: The function converts the cookie back to a object, and then checks if the object is a object by calling . If so, then it does some more stuff to figure out what type of paint to buy. (Note to nitpickers: The actual scenario was not like this, but I presented it this way to illustrate the point....

Some time ago, I described what is for: It's to detect the cases where you call a virtual method with no implementation (a so-called pure virtual method). This can happen during object constructor or destruction, since those are times when you can validly have a partially-implemented object. Well, there's another case this can happen: If the obj...

A customer asked if there was a command-line tool for managing Windows 7 Libraries so that they could create and deploy libraries across their organization. Not only is there such a tool, it even comes with source code. The Shell Library Command Line Sample shows how to manage Windows 7 libraries programmatically via the interface....