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The Old New Thing
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    The Old New Thing

    November 2014 - The Old New Thing

    A user's SID can change, so make sure to check the SID history
    A user's SID can change, so make sure to check the SID history
    November 28, 2014 Nov 28, 2014 11/28/14
    Raymond Chen
    It doesn't happen often, but a user's SID can change. For example, when I started at Microsoft, my account was in the SYS-WIN4 domain, which is where all the people on the Windows 95 team were placed. At some point, that domain was retired, and my account moved to the REDMOND domain. We saw some time ago that the format of a user SID is...

    Comments are closed.0Code
    Some light reading on lock-free programming
    Some light reading on lock-free programming
    November 27, 2014 Nov 27, 2014 11/27/14
    Raymond Chen
    Today is a holiday in the United States, so I'm going to celebrate by referring you to other things to read. I'm going to start with a presentation by Bruce Dawson at GDC 2009, which is basically multiple instances of the question "Is this code correct?", and the answer is always "No!" Although the title of the talk is Lockless Programming in...

    Comments are closed.0Code
    If 16-bit Windows had a single input queue, how did you debug applications on it?
    If 16-bit Windows had a single input queue, how did you debug applications on it?
    November 26, 2014 Nov 26, 2014 11/26/14
    Raymond Chen
    After learning about the bad things that happened if you synchronized your application's input queue with its debugger, commenter kme wonders how debugging worked in 16-bit Windows, since 16-bit Windows didn't have asynchronous input? In 16-bit Windows, all applications shared the same input queue, which means you were permanently in the ...

    Comments are closed.0History
    What is the difference between Full Windows Touch Support and Limited Touch Support?
    What is the difference between Full Windows Touch Support and Limited Touch Support?
    November 25, 2014 Nov 25, 2014 11/25/14
    Raymond Chen
    In the System control panel and in the PC Info section of the PC & Devices section of PC Settings, your device's pen and touch support can be reported in a variety of ways. Here is the matrix: The meaning of No touch and Single touch are clear, but if a device supports multiple touch points, what makes the system report it as having ...

    Comments are closed.0Tips/Support
    The crazy world of stripping diacritics
    The crazy world of stripping diacritics
    November 24, 2014 Nov 24, 2014 11/24/14
    Raymond Chen
    Today's Little Program strips diacritics from a Unicode string. Why? Hey, I said that Little Programs require little to no motivation. It might come in handy in a spam filter, since it was popular, at least for a time, to put random accent marks on spam subject lines in order to sneak past keyword filters. (It doesn't seem to be popular any ...

    Comments are closed.0Code
    Is it wrong to call SHFileOperation from a service? Revised
    Is it wrong to call SHFileOperation from a service? Revised
    November 21, 2014 Nov 21, 2014 11/21/14
    Raymond Chen
    My initial reaction to this question was to say, "I don't know if I'd call it wrong, but I'd call it highly inadvisable." I'd like to revise my guidance. It's flat-out wrong, at least in the case where you call it while impersonating. The registry key HKEY_CURRENT_USER is bound to the current user at the time the key is first accessed by a...

    Comments are closed.0Code
    A library loaded via LOAD_LIBRARY_AS_DATAFILE (or similar flags) doesn't get to play in any reindeer module games
    A library loaded via LOAD_LIBRARY_AS_DATAFILE (or similar flags) doesn't get to play in any reindeer module games
    November 20, 2014 Nov 20, 2014 11/20/14
    Raymond Chen
    If you load a library with the LOAD_LIBRARY_AS_DATA­FILE flag, then it isn't really loaded in any normal sense. In fact, it's kept completely off the books. If you load a library with the LOAD_LIBRARY_AS_DATA­FILE, LOAD_LIBRARY_AS_DATA­FILE_EXCLUSIVE, or LOAD_LIBRARY_AS_IMAGE_RESOURCE flag (or any similar flag added in the future...

    Comments are closed.0Code
    Distinguishing between normative and positive statements to help people answer your question
    Distinguishing between normative and positive statements to help people answer your question
    November 19, 2014 Nov 19, 2014 11/19/14
    Raymond Chen
    Often, we get questions from a customer that use the word should in an ambiguous way: Our program creates a widget whose flux capacitor should have reverse polarity. Attached is a sample program that shows how we create the widget with Create­Widget. However, the resulting widget still has a flux capacitor with standard polarity. Can you...

    Comments are closed.0Non-Computer
    File version information does not appear in the property sheet for some files
    File version information does not appear in the property sheet for some files
    November 18, 2014 Nov 18, 2014 11/18/14
    Raymond Chen
    A customer reported that file version information does not appear on the Details page of the property sheet which appears when you right-click the file and select Properties. They reported that the problem began in Windows 7. The reason that the file version information was not appearing is that the file's extension was .xyz. Older ...

    Comments are closed.0Tips/Support
    How do I enumerate drives the same way that the NET USE command does?
    How do I enumerate drives the same way that the NET USE command does?
    November 17, 2014 Nov 17, 2014 11/17/14
    Raymond Chen
    If you use the Remote Desktop Connection client to connect to another computer, you have the option of making your local drives available to the remote computer. A customer wanted to know how to enumerate all the drives on the local machine. The were able to get the volumes mapped to drive letters, but they also wanted to get the ...

    Comments are closed.0Code
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