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  • Drawbacks of using an integer as a bitfield?

    - by Mark
    I have a bunch of boolean options for things like "accepted payment types" which can include things like cash, credit card, cheque, paypal, etc. Rather than having a half dozen booleans in my DB, I can just use an integer and assign each payment method an integer, like so PAYMENT_METHODS = ( (1<<0, 'Cash'), (1<<1, 'Credit Card'), (1<<2, 'Cheque'), (1<<3, 'Other'), ) and then query the specific bit in python to retrieve the flag. I know this means the database can't index by specific flags, but are there any other drawbacks?

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  • How to convert from string to a number, and vice-versa in C++?

    - by Igal
    DEAR All I'm new to the C++, so maybe someone can say what the proper way to write a function that gets a string char (represents number) and converts it to the integer number. For example : input : Sixty five, output: 65. Maybe it should use by cin.getline() ? Well, vice-versa is little bit simlper... Thanks for advance. Igal

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  • Help me understand why page sizes are a power of 2?

    - by eric
    Answer I need help with is: Recall that paging is implemented by breaking up an address into a page and offset number. It is most efficient to break the address into X page bits and Y offset bits, rather than perform arithmetic on the address to calculate the page number and offset. Because each bit position represents a power of 2, splitting an address between bits results in a page size that is a power of 2. i don't quite understand this answer, can anyone give a simpler explanation?

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  • python on 32 bit

    - by Mponnada
    Hi I am running Windows XP, on 32bit. How do I install python? When I run the installation file, it gives me an error saying "installation package not supported by processor type" does python need 64 bit to execute?

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  • C# reads wrong registry data on 64-bit OS

    - by baal80
    I'm working on a 64-bit Windows and my applicaiton runs with elevated privileges. I have a problem with the following very simple piece of code: myKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run"); if (myKey != null) { string[] HKLMvaluenames = myKey.GetValueNames(); } But for some reason HKLMvaluenames array is populated with values from the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run Is there a way around this problem?

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  • Convert bit to boolean string in HyperLinkField.DataNavigateUrlFormatString

    - by abatishchev
    I have a asp:GridView with a HyperLinkField. It's DataNavigateUrlFormatString property is set to View.aspx?id={0}&isTechnical={1} Select command of appropriate SqlDataSource returns columns of type INT and BIT (from SQL Server 2008). So displayed string becomes something like View.aspx?id=1&isTechnical=1. But I want to display isTechnical=true|False, i.e. Convert.ToBoolean(row["isTechnical"]).ToString().ToLowerInvariant(). How to implement such conversion in page markup?

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  • Replace BIT values with some text

    - by nihi_l_ist
    I have a BIT column with gender (0,1) and want to replace 0 and 1 in the resulting view with the words "man" and "woman". Can i do this right in the view with some system finction or i have to write my own function to do that?

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  • How do I set Internet Explorer 64-bit as my default browser?

    - by Brian Knoblauch
    Windows Vista x64. It defaults to IE 32-bit, and will not allow me to set 64-bit as the default with the "Make Default" button. I'm currently forced to workaround by starting IE 64-bit manually, and leaving it up with an empty window. Then when links are fired from apps, they open in that 64-bit version. Problem being is that sometimes I forget and get a bunch of stuff opened in 32-bit without realizing it. Then I have to remember all the links I clicked, close ALL of them, open IE 64-bit, and put them all back in. Trying to avoid all that re-work when I forget to do the workaround. Unfortunately, all the forums I've googled that discuss this just have a bunch of people saying "don't do that" and "you don't want to do that". Yes, I do want to do this. The particular feature I use only works right in my 64-bit version, and I don't use 32-bit plugins. I fully understand the implications of what I'm doing. :-)

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  • Tess4J working as standalone in 64 bit windows, But fails in Tomcat 7

    - by user118802
    Trying OCR with Tess4J and able to make it work as a standalone application on 64 bit windows. I am using eclipse for the same. Now I am trying to create a war of the same code and deploy it in Tomcat7 and call the api using a servlet. I am getting following error. java.util.NoSuchElementException javax.imageio.spi.FilterIterator.next(ServiceRegistry.java:808) javax.imageio.ImageIO$ImageWriterIterator.next(ImageIO.java:816) javax.imageio.ImageIO$ImageWriterIterator.next(ImageIO.java:801) net.sourceforge.vietocr.ImageIOHelper.getImageByteBuffer(ImageIOHelper.java:190) net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:133) net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:88) net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:75) com.hp.cto.TextReading.doGet(TextReading.java:35) javax.servlet.http.HttpServlet.service(HttpServlet.java:621) javax.servlet.http.HttpServlet.service(HttpServlet.java:722) Any help would be greatly appreciated.

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  • Create shortcut from vb.net on Windows 7 box (64 bit)

    - by Matt
    I am trying to create a desktop shortcut from vb.net code on a Windows 7 box (64 bit). The following code works on XP, but when run on Win7 I just get a message stating the App has stopped working: Imports IWshRuntimeLibrary Dim WshShell As WshShellClass = New WshShellClass Dim MyShortcut As IWshRuntimeLibrary.IWshShortcut ' The shortcut will be created on the desktop 'Win 7 MyShortcut = CType(WshShell.CreateShortcut("C:\Users\Public\Desktop\iexplore.lnk"), IWshRuntimeLibrary.IWshShortcut) 'MyShortcut = CType(WshShell.CreateShortcut("C:\Documents and Settings\All Users\Desktop\iexplore.lnk"), IWshRuntimeLibrary.IWshShortcut) MyShortcut.TargetPath = "C:\Program Files\Internet Explorer\iexplore.exe" 'Specify target app full path MyShortcut.Description = "IE" MyShortcut.Save() Any thoughts or better ways to create a shorcut from code on a Win7 box?

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  • JSON htmlentities javascript

    - by Wessel Rossing
    Hi! I am using an XMLHttpRequest to POST a JSON string to PHP. The JSON object is created in JavaScript and using the JSON2.js from json.org to create an JSON string representing the object. JSON.stringify(object); Whenever the object contains a string which has a special character in it, e.g. é, JavaScript does not give any error but PHP receives an empty array [] Is there a JavaScript function which produces the exact same resutls as the PHP function htmlentities() The data is send via POST, so the following functions escape() encodeURI() encodeURIComponent() are a bit overkill. Thanks!

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  • determine if parity bit representation in MIPS

    - by Hristo
    Is there some instruction in MIPS that will determine the parity of a certain bit representation? I know to determine whether a "number" has an even parity or an odd parity is to XOR the individual bits of the binary representation together, but that seems computationally-intensive for a set of MIPS instructions... and I need to do this as quick as possible. Also, the number I'm working in is represented in Grey Code... just to throw that in there. So is there some pseudo-instruction in MIPS to determine the parity of a "number" or do I have to do it by hand? Thanks, Hristo

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  • Breakpoints are ignored when debugging in Visual Studio 2008 on 64-bit system

    - by Arnold Zokas
    I'm trying to debug an ASP.NET web application in this environment: Windows Server Standard 2008 SP2 x64 Single-core CPU 4GB RAM Visual Studio 2008 with Remote Debugger SP1 .NET 3.5 Web Application running in IIS in 64-bit mode The code I am trying to debug is a simple event handler with some basic sequential code. What I observe is that breakpoints get randomly ignored and VS often exits debug mode when I try to step through the code. The code is compiled in debug mode. I've tried all the usual steps: iisreset, reboot VM, rebuild solution, reinstall Visual Studio. Any ideas?

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  • Best way to represent Bit Arrays in C#??

    - by divinci
    Hi all, I am currently building a DHCPMessage class in c#. RFC is available here : http://www.faqs.org/rfcs/rfc2131.html Pseudo public object DHCPMessage { bool[8] op; bool[8] htype; bool[8] hlen; bool[8] hops; bool[32] xid; bool[16] secs; bool[16] flags; bool[32] ciaddr; bool[32] yiaddr; bool[32] siaddr; bool[32] giaddr; bool[128] chaddr; bool[512] sname; bool[1024] file; bool[] options; } If we imagine that each field is a fixed length bit array, what is : The most versitile Best practice way of representing this as a class??? OR.. how would you write this? :)

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  • OPOS not working on 64 bit system

    - by Blair Mahaffy
    Anyone have experience with OPOS? I can't get my app to recognize the LDNs for the devices running on a 64 bit machine. I've got down to the point where I know that the OleforRetail stuff is now under Wow6432Node in the Registry. I suspect the common controls can't find the LDN because of this. Is there any kind of workaround? Failing that, is there a centralized OPOS development forum somewhere? BTW: I work with the common controls supplied by Monroe Consulting. Thanks!

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  • GMP variable's bit size..

    - by kishorebjv
    How to know the size of a declared variable in GMP??or how can we decide the size of an integer in GMP? mpz_random(temp,1); in manual it is given that this function allocates 1limb(=32bits for my comp) size to the "temp".... but it is having 9 digit number only.. SO i dont think that 32 bit size number holds only 9 digits number.. So please help me to know the size of integer variable in GMP .. thanks in adv..

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