What order are pages in a memory-mapped file flushed out to disk?
Say you create a memory-mapped file mapping and write data to it. In which order will the pages be flushed out to disk? Is it in the order the pages were written? Or are pages closer to the beginning...
View ArticleEven if your assembly language code doesn’t call any Windows APIs, you still...
Writing in assembly language doesn't absolve you from adhering to the software conventions. Certainly you have more flexibility in assembly language, but that doesn't give you freedom to do anything...
View ArticlePrecision questioning: The cynical description
Precision questioning is a technique used by some senior executives at Microsoft. Although precision questioning positions itself as a toolkit for critical thinking and problem solving, its use in...
View ArticleAsking for clear written documentation that Require trusted path for...
A customer had turned on the Require trusted path for credential entry policy (under Computer Configuration, Administrative Templates, Windows Components, Credential User Interface). They demanded...
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Why is there a limit of 15 shell icon overlays?
There is a limit of fifteen shell icon overlays. Why fifteen? The value 15 came from the corresponding limit for image lists. The ImageList_SetOverlayImage function supports up to 15 image list...
View ArticleWhy does my C++/WinRT project get errors of the form ‘winrt::impl::produce‘:...
So your C++/WinRT project gets build failures of the form base.h(8208): error C2259: 'winrt::impl::produce<D, I>': cannot instantiate abstract class with [...
View ArticleWhy does my C++/WinRT project get errors of the form “Unresolved external...
So your C++/WinRT project gets build failures of the form unresolved external symbol "void * __cdecl winrt_make_YourNamespace_YourClass(void)" (?winrt_make_YourNamespace_YourClass@YAPAXXZ) referenced...
View ArticleThe Resource Compiler defaults to CP_ACP, even in the face of subtle hints...
The Resource Compiler assumes that its input is in the ANSI code page of the system that is doing the compiling. This may not be the same as the ANSI code page of the system that the .rc was authored...
View ArticleHow can I determine in a C++ header file whether C++/CX is enabled? How about...
Suppose you’re writing a header file that wants to take advantage of C++/CX or C++/WinRT features if the corresponding functionality is available. // async_event_helpers.h #if (? what goes here ?) //...
View ArticleWhat order do the items in the “New” menu appear? It looks kind of random.
When you right-click on an empty space in an Explorer folder and select the New menu item, you always start with Folder and Shortcut, but the rest seems to be a jumbled list of file types. Folder...
View ArticleIf you can use GUIDs to reference files, why not use them to remember...
You can ask for a GUID identifier for a file, and use that GUID to access the file later. You can even recover a (perhaps not the) file name from the GUID. David Trapp wishes programs would use GUIDs...
View ArticleWhat should you do if somebody passes a null pointer for a parameter that...
If you have a function for which a parameter may not be null, what should you do if somebody passes null anyway? There are multiple layers to this question, depending on the technology you are using,...
View ArticleWhy does SetFocus fail without telling me why?
One of my colleagues was debugging a program and discovered that a call to SetFocus returned NULL, which the documentation calls out as indicating an error condition. However, a follow-up call to...
View ArticleA simple workaround for the fact that std::equal takes its predicate by value
The versions of the std::equal function that takes a binary predicate accepts the predicate by value, which means that if you are using a functor, it will be copied, which may be unnecessary or...
View ArticleWhat is WofCompressedData? Does WOF mean that Windows is a dog?
A customer doing performance analysis of their program discovered that there were reads from an alternate data stream called WofCompressedData. On the Internet, if you search for...
View ArticleHow to compare two packed bitfields without having to unpack each field
Suppose you are packing multiple bitfields into a single integer. Let's say you have a 16-bit integer that you have packed three bitfields into: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 r g b Suppose you...
View ArticleMy initial frustration trying to configure our internal VoIP phones that were...
I remember when Microsoft made their initial internal roll-out of its VoIP phones. The VoIP phones were integrated with a desktop app which let you configure the phone, managed your telepresence, as...
View ArticleAlternate definitions for English words, as inferred from bug reports
Here are some terms that appear in bug reports. "Empty" means "There are a bunch of things here, but not the ones I wanted." "Blank" means "There are things, maybe." "The picture is wrong" can mean...
View ArticlePredator-prey reversal: Rock lobsters vs whelks on Malgas Island and Marcus...
Malgas Island is dominated by rock lobsters, who happily feast upon whelks. Just 4km away, Marcus Island is dominated by whelks, not a rock lobster to be found. Researcher Amos Barkai couldn't figure...
View ArticleHow do I destruct an object that keeps a reference to itself, because that...
Consider the case of an ordered work queue. Components can queue work to the worker thread, with the expectation that the work will run sequentially. class OrderedWorkQueue { public:...
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