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Over the past few days we've learned how 16-bit Windows exported and imported functions from DLLs and that the way functions are exported from 32-bit DLLs matches the 16-bit method reasonably well. But the 16-bit way functions are imported simply doesn't work in the 32-bit world. Recall that in 16-bit Windows, the fixups for an imported functio...

Last time, we saw how the way Win32 exports functions is pretty much the same as the way 16-bit Windows exports functions, but with a change in emphasis from ordinal-based exports to name-based exports. This change in emphasis is not expressed anywhere in the file format; both 16-bit and 32-bit DLLs can export either by name or by ordinal (or by ...

The designers of 32-bit Windows didn't have to worry quite so much about squeezing everything into 256KB of memory. Since modules in Win32 are based on demand-paging, all you have to do is map the entire image into memory and then run around accessing the parts you need. There is no distinction between resident and non-resident names; the names of ...

Whenever I write an article explaining that programs should avoid doing X, I can confidently rely on a comment saying, "Well, Microsoft Product Q does this!" as if to say, "Gotcha, you hypocrite!" But they're saying "gotcha" to the wrong person. Because, and I'm sure it's a shock to many people to read this, I did not personally wr...

When operating with the Windows shell, you will almost certainly find yourself at some point working with a pointer to an item ID list, known also as a "pidl" (rhymes with "middle"). On the other hand, when working with OLE you may find yourself having do deal with monikers. In a sense, they both do the same thing. They let you refer to some sort o...

In the discussions following why Windows setup lays down a new boot sector, some commenters suggested that Windows setup could detect the presence of a non-Windows partition as a sign that the machine onto which the operating system is being installed belongs to a geek. In that way, the typical consumer would be spared from having to deal with a ...

Commenter Pavel Vozenilek noticed that if you type my name into Google, there is only one sponsored link, and it's from Google themselves, inviting you to apply for a job there. (Maybe I should sue. Perhaps I can get a settlement.) When I mentioned this to some other people at Microsoft, they started hunting around to see what sort of ads cam...

There are many ways a program can establish itself as a single-instance program; I won't go into them here. But once people head down the path of a single-instance program, they bump into another issue in their security review: Denial of service. We are using a named mutex with a fixed name in order to detect whether another copy of the program is...

The classic Start menu and the "All Programs" portion of the Windows XP Start menu permit you to customize the order of the shortcuts that appear there. You can use drag/drop to rearrange them, or force them to be sorted by name. But why is there no programmatic interface to these actions? Because the power would be used for evil far more tha...

A double-precision floating point number carries fifteen significant digits. What does this really mean? I multiplied 0.619207 by 10,000,000 and got 6192069.999999991 instead of 6192070. That's only six significant digits; where's my fifteen? Talking about significant digits is really just a shorthand for talking about relative precision. "Fifte...