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Perhaps one of the most misunderstood sentences in the Win32 documentation is this little bit in the documentation for : If hFile is INVALID_HANDLE_VALUE, the calling process must also specify a size for the file mapping object in the dwMaximum­Size­High and dwMaximum­Size­Low parameters. In this scenario, Create­File­Map...

As a puzzle, commenter nobugz asks, "What kind of infinity is 1.#J?" double z = 0; printf("%.2f", 1/z); Now, the division by zero results in IEEE positive infinity, would would normally be printed as 1#INF. But the catch here is that the print format says "Display at most two places after the decimal point." But where is the decimal point in i...

The structure lets you specify a bitmap to appear next to the menu item. Is there a way to do this from a menu resource template? No. If you look at the format of menu templates, you'll see that there is nowhere to specify a bitmap. Which kind of makes sense, because it is the responsibility of the application to destroy the bitmap refer...

Mini-me.

Many years ago, I wrote, "Do not write in-process shell extensions in managed code." Since I originally wrote that article, version 4 of the .NET Framework was released, and one of the features of that version is that it supports in-process side-by-side runtimes. Does that mean that it's now okay to write shell extensions in managed code? The ans...

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...