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  • What's the deal with URLs for Yandex.Metrica not prepended with "http"?

    - by sharptooth
    The description of Yandex.Metrica explicitly says that URLs like //mc.yandex.ru/metrika/watch.js (no http: in front) that the web site owner has to insert into his pages are not erroneous. So for example this code: <img src="//mc.yandex.ru/watch/00000" style="position:absolute; left:-9999px;" alt="" /> is claimed to be okay. However the code validator thinks such URLs are not okay and I'd rather make the validator happy so that noone breaks the code later trying to "fix" it. Why are these URLs not prepended with http:? What happens if I actually prepend them with http:?

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  • Is it true that first versions of C compilers ran for dozens of minutes and required swapping floppy disks between stages?

    - by sharptooth
    Inspired by this question. I heard that some very very early versions of C compilers for personal computers (I guess it's around 1980) resided on two or three floppy disks and so in order to compile a program one had to first insert the disk with "first pass", run the "first pass", then change to the disk with "second pass", run that, then do the same for the "third pass". Each pass ran for dozens of minutes so the developer lost lots of time in case of even a typo. How realistic is that claim? What were actual figures and details?

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  • How to explain that writing universally cross-platform C++ code and shipping products for all OSes is not that easy?

    - by sharptooth
    Our company ships a range of desktop products for Windows and lots of Linux users complain on forums that we should have been written versions of our products for Linux years ago and the reason why we don't do that is we're a greedy corporation all our technical specialists are underqualified idiots Our average product is something like 3 million lines of C++ code. My and my colleagues analysis is the following: writing cross-platform C++ code is not that easy preparing a lot of distribution packages and maintaining them for all widespread versions of Linux takes time our estimate is that Linux market is something like 5-15% of all users and those users will likely not want to pay for our effort when this is brought up the response is again that we're greedy underqualified idiots and that when everything is done right all this is easy and painless. How reasonable are our evaluations of the fact that writing cross-platform code and maintaining numerous ditribution packages takes lots of effort? Where can we find some easy yet detailed analysis with real life stories that show beyond the shadow of a doubt what amount of effort exactly it takes?

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  • The executable is absent yet I can execute the command on the command line

    - by sharptooth
    There's such utility for Windows developers called regtlib. I have three computers - one with WinXP, another two with Win2k3. If I run built-in Windows search for file with wildcard regtlib* on the whole filesystem search finds nothing on all three computers. If I try to execute regtlib on WinXP command line it says it can't find such a file or built-in command. The same on one of the two Win2k3 computers. But when I do that on the other Win2k3 computer I see typical regtlib output. What happens? What is the magic that invokes regtlib without the file being present on the filesystem?

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  • Is it possible to stop the "Beep" device on all computers in a Windows network?

    - by sharptooth
    On Windows the default behavior it to make an annoying "beep" sound every time Windows things something notable happened. The result is that when someone send a company-wide email via the MS Exchange all computers around my cubicle beep one by one. This is annoying and makes no sense. Luckily beeping can be shut off. Someone has to: open the "Device Manager", select "View - Show hidden devices", find the "Beep" device in "Non-Pug and Play Devices" node, open its properties, go to the "Driver" tab, set "startup type" to "Disabled" and click "Stop". The "Beep" device will stop and no longer produce the useless sound. This solution however requires tracking every computer and then talking to its user which is not very convenient. Device Manager doesn't allow stopping a device on another computer. I'm looking for a solution that can be deployed by the administrators team. We have a domain and the administrators even install the programs company-wide automatically. Are there any means to stop the "Beep" device an all computers in the Windows network with some remote-administration features automatically?

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  • How does a so-called "LED monitor" work?

    - by sharptooth
    Every here and there I hear about new LED monitors. I imagined that they were really LED monitors - that their screens were formed of multiple tiny LEDs that lit up in a controlled manner to form an image. Yet turns out they are LED backlit LCD monitors. What's the difference between this and a trusty Belinea 10 17 51 I've been using for the five years already?

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  • Is DHCP lease expriring years from now okay?

    - by sharptooth
    I'm reviewing Azure web role logs and there's output from ipconfig /all IPv4 Address. . . . . . . . . . . : 10.61.145.37(Preferred) . Subnet Mask . . . . . . . . . . . : 255.255.254.0. Lease Obtained. . . . . . . . . . : Monday, September 24, 2012 12:26:00 PM. Lease Expires . . . . . . . . . . : Thursday, October 31, 2148 6:55:12 PM. you see, the lease expires in year 2148 but my VM will likely not run for more than one month - when I deploy the new version of my code I first deploy it to new VMs, then switch traffic, then release the new VMs. In general such usage pattern is normal - VMs typically live from several dozen minutes to several weeks on Azure. I suspect the lease that long will cause problems on the internal Azure network sooner or later. Is such long DHCP lease okay or is it likely a misconfiguration?

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  • What happens if I pierce a TFT monitor?

    - by sharptooth
    What happens if I pierce a TFT monitor screen with something sharp (say a nail)? Will only the pierced region malfunction or the whole monitor screen? There's an opinion that in this case the entire screen will "flow out" (more specifically - "liquid crystals will flow out") and stop working completely. Is that truth or an urban legend?

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  • Will wear induced by turning computers off in the evening be offset by energy savings?

    - by sharptooth
    I'm asking this here because this is primarily a huge office scenario and administrators will more likely have the answer I'm looking for. Employees' desktop computers can be either left turned on for the whole night or switched off in the evening and turned back on in the morning. The latter will surely save energy. In the same time turning on and off is very harmful for the equipment - hardware often breaks specifically when turned on. Both energy and hardware replacements cost money. With energy it's quite obvious - you pay every month according to what your power meter shows. With hardware replacements it's worse - you need qualified stuff to quickly diagnose the problems and once something breaks the affected employee will have to wait for some time while his computer is fixed/replaced and the data is recovered. So the company has to choose between saving money on energy and saving money on computer maintaince and lost hours. Such decisions must be well though. Is there any detailed study of how turning computers off each evening affects their lifetime?

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  • Speed-up large number of files deletion on NTFS volumes

    - by sharptooth
    Every now and then I need to delete a folder containing something like 500k files from an NTFS volume. I do this with Windows Explorer. Since NTFS journals all the service data changes each deletion is carried out serially and so the whole 500k files deletion takes ages. I remember when I did the same in FAT32 it ran uncomparably faster. Is there any way to speed up deletion of large number of files on NTFS volumes?

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  • COM+ applications deployment behaves different on different systems

    - by sharptooth
    In order to give my COM+ application enough credentials I want its components to be instantiated under "Local Service" account. When I create a server application with a wizard on Win2k3 it offers to choose under whom to instantiate components - "Local Service" is one of choices. But on WinXP "Local Service" is not offered at all in the wizard. When I open the "Identity" tab of the COM+ application under Win2k3 there'a a handful of choises, "Local Service" included, and I can select any of them. But on WinXP the same "Identity" tab only offers "Interactive user". What does this difference depend on? Does it depend on the system or on something else?

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  • How is fire spread in server rooms and datacenters?

    - by sharptooth
    Every now and then I read that a severe fire has happened in some datacenter, lots of equipment has been damaged and customers have gone offline. Now I wonder what is there to support and spread fire? I mean walls in a server room usually have little or no finish. Racks are made of metal. Almost all units have metal cases. Cables have (or at least should have) insulation of materials that don't spread fire. What is spreading fire in a server room or datacenter?

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  • Is there any documentation on IdentityUnmarshal interface?

    - by sharptooth
    Whenever I put my component into COM+ and call CoCreateInstance() on the client the following happens: the runtime instantiates the objecs (calls IClassFactory::CreateInstance()) the runtime calls QueryInterface() for the interface specified in teh CoCreateInstance() call the runtime calls QueryInterface() for IdentityUnmarshal interface ({0000001b-0000-0000-c000-000000000046}) The only thing I can find is the declaration in comdef.h that there exists IdentityUnmarshal interface with that interface id. Is there any more information on it?

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  • What's the purpose of noncreatable coclasses in IDL?

    - by sharptooth
    What is the reason for declaring noncreatable coclasses like the following in IDL? [ uuid(uuidhere), noncreatable ] coclass CoClass { [default] interface ICoClass; }; I mean such class will not be registered to COM anyway. What's the reason to mention it in the IDL file and in the type library produced by compiling that IDL file?

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  • How to test COM object integrity automatically?

    - by sharptooth
    Every COM object must have integrity. In simplified terms this means that if an object implements 3 interfaces - A, B and C and I have A* pointer to the object I must be able to successfully QueryInterface() both B and C and having B I must be able to retrieve A and C and having C I must be able to retrieve A and B. Now my object implements 5 interfaces and I want to test its integrity. Writing checks for all of the above myself will require a substantial effort. Is there a tool or some easily tweakable code or a code pattern that would do it?

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  • What happens if two COM classes each without a threading model are implemented in one in-proc COM se

    - by sharptooth
    Consider a situation. I have an in-proc COM server that contains two COM classes. Both classes are marked as "no threading model" in the registry - the "ThreadingModel" value is just absent. Both classes read/write the same set of global variable without any synchronization. As far as I know "no threading model" will enforce COM to disallow concurrent access to the same or different instances of the same class by different threads. Will COM prevent concurrent access to instances of the two abovementioned different classes? Do I need synchronization when accessing the global variables from two different COM classes in this situation?

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  • How do I subvert computer idle detection on Windows?

    - by sharptooth
    In order to detect user absence GetLastInputInfo() can be used. I want to make GetLastInputInfo() return that I've just used keyboard/mouse all the time - as I've been actively using the computer so that whoever relies on GetLastInputInfo() thinks I'm actively using the computer. Can I use any Windows API functions to achieve that?

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  • How is dynamic memory allocation handled when extreme reliability is required?

    - by sharptooth
    Looks like dynamic memory allocation without garbage collection is a way to disaster. Dangling pointers there, memory leaks here. Very easy to plant an error that is sometimes hard to find and that has severe consequences. How are these problems addressed when mission-critical programs are written? I mean if I write a program that controls a spaceship like Voyager 1 that has to run for years and leave a smallest leak that leak can accumulate and halt the program sooner or later and when that happens it translates into epic fail. How is dynamic memory allocation handled when a program needs to be extremely reliable?

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  • Does the COM server have to call SysFreeString() for an [out] parameter?

    - by sharptooth
    We have the following interface: [object, uuid("uuidhere"), dual ] interface IInterface : IDispatch { [id(1), propget] HRESULT CoolProperty( [out, retval] BSTR* result ); } Now there's a minor problem. On one hand the parameter is "out" and so any value can be passed as input, the parameter will become valid only upon the successful return. On the other hand, there's this MSDN article which is linked to from many pages that basically says (the last paragraph) that if any function is passed a BSTR* it must free the string before assigning a new string. That's horrifying. If that article is right it means that all the callers must surely pass valid BSTRs (maybe null BSTRs), otherwise BSTR passed can be leaked. If the caller passed a random value and the callee tries to call SysFreeString() it runs into undefined behavior, so the convention is critical. Then what's the point in the [out] attribute? What will be the difference between the [in, out] and [out] in this situation? Is that article right? Do I need to free the passed BSTR [out] parameter before assigning a new one?

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  • Why is a 16-bit register used with BSR instruction in this code snippet?

    - by sharptooth
    In this hardcore article there's a function find_maskwidth() that basically detects the number of bits required to represent itemCount dictinct values: unsigned int find_maskwidth( unsigned int itemCount ) { unsigned int maskWidth, count = itemCount; __asm { mov eax, count mov ecx, 0 mov maskWidth, ecx dec eax bsr cx, ax jz next inc cx mov maskWidth, ecx next: } return maskWidth; } the question is why do they use ax and cx registers instead of eax and ecx?

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  • How to reliably replace a library-defined error handler with my own?

    - by sharptooth
    On certain error cases ATL invokes AtlThrow() which is implemented as ATL::AtlThrowImpl() which in turn throws CAtlException. The latter is not very good - CAtlException is not even derived from std::exception and also we use our own exceptions hierarchy and now we will have to catch CAtlException separately here and there which is lots of extra code and error-prone. Looks like it is possible to replace ATL::AtlThrowImpl() with my own handler - define _ATL_CUSTOM_THROW and define AtlThrow() to be the custom handler before including atlbase.h - and ATL will call the custom handler. Not so easy. Some of ATL code is not in sources - it comes compiled as a library - either static or dynamic. We use the static - atls.lib. And... it is compiled in such way that it has ATL::ThrowImpl() inside and some code calling it. I used a static analysis tool - it clearly shows that there're paths on which the old default handler is called. To ensure I even tried to "reimplement" ATL::AtlThrowImpl() in my code. Now the linker says it sees two declarations of ATL::AtlThrowImpl() which I suppose confirms that there's another implementation that can be called by some code. How can I handle this? How do I replace the default handler completely and ensure that the default handler is never called?

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