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Here are some strange but legal declarations in C/C++: int typedef a; short unsigned typedef b; By convention, the typedef keyword comes at the beginning of the line, but this is not actually required by the language. The above declarations are equivalent to typedef int a; typedef short unsigned b; The C language (but not C++) also permits...

Today's Little Program prints the current selection in all open Explorer windows. (This is an alternative to the C++ version that involves a ridiculous amount of typing.) var shellWindows = new ActiveXObject("Shell.Application").Windows(); for (var i = 0; i < shellWindows.Count; i++) { var w = shellWindows.Item(i); WScript.StdOut.WriteLine...

While developing tests, a developer observed erratic behavior with respect to : In my test, I call and it fails with . Fair enough, because my test forgot to call . But then I went and checked the production code: In response to a client request, the production code creates a brand new thread to service the request. The brand new thread does ...

Opportunistic locks allow you to be notified when somebody else tries to access a file you have open. This is usually done if you want to use a file provided nobody else wants it. For example, you might be a search indexer that wants to extract information from a file, but if somebody opens the file for writing, you don't want them to get Sharin...

A customer liaison asked whether it was legal to use to create a parent/child relationship between windows which belong to different processes. "If I remember correctly, the documentation for used to contain a stern warning that it is not supported, but that remark does not appear to be present any more. I have a customer who is reparenting windo...

Today's Little Program is a managed version of the text-extraction program from several years ago. It turns out that it's pretty easy in managed code because the accessibility folks sat down and wrote a whole framework for you, known as UI Automation. (Some people are under the mistaken impression that UI Automation works only for extracting d...

A customer was having trouble with job objects, specifically, the customer found that a Wait­For­Single­Object on a job object was not completing even though all the processes in the job had exited. This is probably the most frustrating part of job objects: A job object does not become signaled when all processes have exited. The s...

The Read­File and Write­File functions have a parameter called lp­Number­Of­Byte­Read, which is documented as __out_opt LPDWORD lpNumberOfBytesRead, // or __out_opt LPDWORD lpNumberOfBytesWritten, "Cool," you think. "That parameter is optional, and I can safely pass NULL." My program runs fine if standard output ...

Suppose you have a TreeView control, and you created an item in it, and you want to move the to a new parent. How do you do that? You can't, at least not all in one motion. You will have to delete the and then re-create it in its new location. If you want to move an within the same parent (say, to reorder it among its siblings), then you...

The IMessage­Filter::Handle­Incoming­Call method describes the incoming call by means of an INTERFACE­INFO structure: typedef struct tagINTERFACEINFO { LPUNKNOWN pUnk; IID iid; WORD wMethod; } INTERFACEINFO, *LPINTERFACEINFO; The wMethod is a zero-based index of the method within the interface. For example, IUnknown...