Showing tag results for Code

When you associate a file handle with an I/O completion port with the function, you can pass an arbitrary pointer-sized integer called the which will be returned by the function for every I/O that completes against that file handle. But isn't that parameter superfluous? If somebody wanted to associated additional data with a file handle, they...

As every computer scientist knows, the IEEE floating point format reserves a number of representations for infinity and non-numeric values (collectively known as NaN, short for not a number). If you try to print one of these special values with the Visual C runtime library, you will get a corresponding special result: Positive and negative inf...

If you want to figure out some quirks of a calling convention, you can always ask the compiler to do it for you, on the not unreasonable assumption that the compiler understands calling conventions. "When a __stdcall function returns a large structure by value, there is a hidden first parameter that specifies the address the return value should ...

A tiny control surface.

A particular scenario was hanging, and the team responsible for the scenario debugged it to the point where they saw that their X component was waiting for their Y component, which was waiting for Explorer, so they asked for help chasing the hang into Explorer. The team was kind enough to have shared what they've learned so far: kd&g...

You're debugging a program and you want to set a breakpoint on some function, say, netapi32!Ds­Address­To­Site­NameW, but when you execute the bp netapi32!Ds­Address­To­Site­NameW command in the debugger, the debugger says that there is no such function. The Advanced Windows Debugging book says that the bp comman...

You might have a program that generates log files or other text content with an extension other than . You naturally might want to open these documents in the user's default text editor. You might decide to ask the Windows developer support team, "How can I figure out what program is the handler for text files?" The idea being that once you get t...

Today's "Little Program" displays an overlay on the taskbar button. I've seen some people call this a "badge", but "overlay" is the official term. Start with our scratch program and make the following changes: #include <comip.h> #include <comdef.h> #include <shlobj.h> #include <shellapi.h> _COM_SMARTPTR_TYPEDEF(ITaskb...

Advanced Query Syntax to the rescue.

The parsing name for a shell item is handy, because it lets you regenerate the item later. Actually, the pidl for the shell item is even better, because that is the official way of saving and restoring objects. It's the pidl that gets saved in a shortcut, and since shortcuts can be copied around from machine to machine, pidls must be transportable...