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  • Is this paragraph in Code Complete 2 backwards, or am I misunderstanding it?

    - by user828584
    In chapter 13, when talking about pointers, there is a paragraph: Sometimes, however, you would like to have the semantics of pass by reference—that is, that the passed object should not be altered—with the implementation of pass by value—that is, passing the actual object rather than a copy. It seems like the author made a mistake and mixed the two up. Is this true, or am I not understanding what he's saying correctly?

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  • Reading cpu temperature Intel Celeron (R) with lm-sensors

    - by tim_a
    I know there are already a lot of questions like this, but non of the answers provided there could fix my problem. I try to read out my cpu temperature with lm-sensors on my ubuntu 10.04 LTS installation but I can't get to work. I did try the command sensors-detect several times but still nothing. My computer is an old PC with an Intel Celeron (R) @ 2.60 GHz. The odd thing is that the hdd temp is shown in the applet but when I type in the terminal sensors I get the error: "No sensors found! Make sure you loaded all the kernel drivers you need." I'm not really interested in the hdd temperature but I think it is strange that these sensors do work in the applet and not in the terminal. This is the output that sensors-detect gives: http://pastebin.com/F4hVKaLU Any suggestions?

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  • Is there a canonical source supporting "all-surrogates"?

    - by user61852
    Background The "all-PK-must-be-surrogates" approach is not present in Codd's Relational Model or any SQL Standard (ANSI, ISO or other). Canonical books seems to elude this restrictions too. Oracle's own data dictionary scheme uses natural keys in some tables and surrogate keys in other tables. I mention this because these people must know a thing or two about RDBMS design. PPDM (Professional Petroleum Data Management Association) recommend the same canonical books do: Use surrogate keys as primary keys when: There are no natural or business keys Natural or business keys are bad ( change often ) The value of natural or business key is not known at the time of inserting record Multicolumn natural keys ( usually several FK ) exceed three columns, which makes joins too verbose. Also I have not found canonical source that says natural keys need to be immutable. All I find is that they need to be very estable, i.e need to be changed only in very rare ocassions, if ever. I mention PPDM because these people must know a thing or two about RDBMS design too. The origins of the "all-surrogates" approach seems to come from recommendations from some ORM frameworks. It's true that the approach allows for rapid database modeling by not having to do much business analysis, but at the expense of maintainability and readability of the SQL code. Much prevision is made for something that may or may not happen in the future ( the natural PK changed so we will have to use the RDBMS cascade update funtionality ) at the expense of day-to-day task like having to join more tables in every query and having to write code for importing data between databases, an otherwise very strightfoward procedure (due to the need to avoid PK colisions and having to create stage/equivalence tables beforehand ). Other argument is that indexes based on integers are faster, but that has to be supported with benchmarks. Obviously, long, varying varchars are not good for PK. But indexes based on short, fix-length varchar are almost as fast as integers. The questions - Is there any canonical source that supports the "all-PK-must-be-surrogates" approach ? - Has Codd's relational model been superceded by a newer relational model ?

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  • Refactoring obscurely commented code

    - by wraith808
    In refactoring code, I came across code that had comments. Looking closer at the comments, I could see that the code was clearly not doing what the comments said. Without access to the coder nor documentation, and without clear direction regarding the code (i.e. defects as to the fact that the code is operating incorrectly), is the best practice to assume that the code is correct, and clean up the comments?

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  • Source code not matching uploaded HTML file

    - by benhowdle89
    I'm not sure if this is the right place to ask but i'm having a hugely frustrating problem with Coda and my website (i'm not sure which one is causing the issue) I'm using Coda to make changes to my website, Coda uses built in FTP to save changes to your web page. So when you hit Save, it uploads the new file. I've been using Coda for months and never had a problem until now. I am making changes in the html of my index.php and hitting save, it's successfully uploading the file but no changes are reflected in the source code in ANY browser. I even logged into cPanel on my website, ie. www.example.com:2082 and looked at the file - the changes have been made successfully. But the actual webpage in browser's source code, no changes?? I have tried adding which made no difference. Interestingly i make changes to style.css and the changes are instant. I have emptied the cache on all of my browsers but i'm still having an issue. Does this sound like a Coda problem or has anyone heard of such a thing?

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  • Workflow Automation software for SVN

    - by KyleMit
    We're currently using IBM's ClearQuest for task management and ClearCase for change management. They plug and play very well with each other. Users can create tasks in ClearCase as defects and enhancements, and developers can use those tasks to check out and modify code in source control. We're looking to upgrade to a better, more modern Source Control system, like SVN, although we're not married to that as our Source Control system. There are loads of source control systems out there, but I'm having difficulty finding one that also includes the ability to have users enter tasks and track them, especially in a native way to the source control system itself. Are there any products that replace ClearQuest for systems like SVN? Are there any other cheap / open source application pairs that handle both sides of the coin?

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  • Comments in code

    - by DavidMadden
    It is a good practice to leave comments in your code.  Knowing what the hell you were thinking or later intending can be salvation for yourself or the poor soul coming behind you.  Comments can leave clues to why you chose one approach over the other.  Perhaps staged re-engineering dictated that coding practices vary.One thing that should not be left in code as comments is old code.  There are many free tools that left you version your code.  Subversion is a great tool when used with TortoiseSVN.  Leaving commented code scattered all over will cause you to second guess yourself, all distraction to the real code, and is just bad practice.If you have a versioning solution, take time to go back through your code and clean things up.  You may find that you can remove lines and leave real comments that are far more knowledgeable than having to remember why you commented out the old code in the first place.

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  • Ubuntu Server driver source catalog

    - by SRU IT
    Where do I find this drivers on my .iso image for the server software, or what is the ftp: location to download these files as those are the two options i am given on how to solve this issue. ubuntu-server 11.10, hardware: dell r210 what I am reading is that I am possibly missing 'mpt2sas' driver somewhere in this boot disc. I'm attempting to download a different version in the hopes that the mistake I made was downloading software meant for an AMD architecture.

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  • Reading input all together or in steps?

    - by nischayn22
    For many programming quizzes we are given a bunch of input lines and we have to process each input , do some computation and output the result. My question is what is the best way to optimize the runtime of the solution ? Read all input, store it (in array or something) ,compute result for all of them, finally output it all together. or 2. Read one input, compute the result, output the result and so on for each input given.

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  • Reading Partition Start and End in TestDisk

    - by neanderslob
    I'm using TestDisk in an attempt to recover a partition gone terribly awry. Identifying the partition in question should simply be a matter of simply recognizing the location in the disk that it occupies. Since I know the location of the partition in question from GParted, I need to translate that over to the format that TestDisk uses, which I can't quite figure out. GParted gives the First and Last sectors as follows: First Sector: 1708032 Last Sector: 54637719 Total sector: 52929688 Test Disk gives the partitions in the following way: Start: 1691 110 20 End: 4986 39 5 Size in Sectors: 52929688 My question is: how do I translate the location specified in GParted to that in TestDisk? See the following image for any contextual clarification you might need:

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  • Reading RSS data with Linq to Xml

    - by hakanbilge
     Linq to Xml is the best method, I think, for querying, constructing and writing Xml data. In this article, I'll show how to read Rss data with this powerful Xml technique, Linq. Now, create a Website in Visual Studio, add a Textbox and a  [read more....]

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  • reading k&r(c book) and confusing 1st chapter code [closed]

    - by DarkEnergy
    #include <stdio.h> /* copy input to output; 2nd version*/ main() { int c; while ((c = getchar()) != EOF) putchar(c); } this is very confusing... since you never escape the while loop. I've learned that EOF is -1. i type -1 but it just reprints it. It's a never ending loop. Over time did the library get changed and differs from what the book intended it to be? when i say library i mean the putchar()/getchar() that's in the library... sorry.

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  • Reading the memory of a N64

    - by toazron1
    I'm looking for a way to read the memory of a N64, while the game is running, in real time. I have a c# program which hooks into the memory of a running emulator and tracks SSB64 stats. I want to do the same thing with the physical N64. Currently it is possible to read the memory with a gameshark pro, however it's extremely slow, buggy, and not practical for what I am trying to accomplish. Would it be possible to tap into the gameshark, or the N64 directly, to access the memory in real time? Thanks!

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  • Where I can find /sbin/hotplug in my kernel source

    - by Rahul
    I am reading hotplug events. And I want to enable automatic loading unloading module, when a new device is added. For that I read that kernel does it using /sbin/hotplug script, but I am not able to find it in my source code, can someone help me out where can I find it? Also when I tried to do cat /proc/sys/kernel/hotplug there is nothing coming in output, I am running the same kernel which I downloaded and built.

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  • Reading XML Content

    using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Xml.Linq; using System.Diagnostics; using System.Threading; using System.Xml; using System.Reflection; namespace XMLReading { class Program     { static void Main(string[] args)         { string fileName = @"C:\temp\t.xml"; List<EmergencyContactXMLDTO> emergencyContacts = new XmlReader<EmergencyContactXMLDTO, EmergencyContactXMLDTOMapper>().Read(fileName); foreach (var item in emergencyContacts)             { Console.WriteLine(item.FileNb);             }          }     } public class XmlReader<TDTO, TMAPPER> where TDTO : BaseDTO, new() where TMAPPER : PCPWXMLDTOMapper, new()     { public List<TDTO> Read(String fileName)         { XmlTextReader reader = new XmlTextReader(fileName); List<TDTO> emergencyContacts = new List<TDTO>(); while (true)             {                 TMAPPER mapper = new TMAPPER(); bool isFound = SeekElement(reader, mapper.GetMainXMLTagName()); if (!isFound) break;                 TDTO dto = new TDTO(); foreach (var propertyKey in mapper.GetPropertyXMLMap())                 { String dtoPropertyName = propertyKey.Key; String xmlPropertyName = propertyKey.Value;                     SeekElement(reader, xmlPropertyName);                     SetValue(dto, dtoPropertyName, reader.ReadElementString());                 }                 emergencyContacts.Add(dto);             } return emergencyContacts;         } private void SetValue(Object dto, String propertyName, String value)         { PropertyInfo prop = dto.GetType().GetProperty(propertyName, BindingFlags.Public | BindingFlags.Instance);             prop.SetValue(dto, value, null);         } private bool SeekElement(XmlTextReader reader, String elementName)         { while (reader.Read())             { XmlNodeType nodeType = reader.MoveToContent(); if (nodeType != XmlNodeType.Element)                 { continue;                 } if (reader.Name == elementName)                 { return true;                 }             } return false;         }     } public class BaseDTO     {     } public class EmergencyContactXMLDTO : BaseDTO     { public string FileNb { get; set; } public string ContactName { get; set; } public string ContactPhoneNumber { get; set; } public string Relationship { get; set; } public string DoctorName { get; set; } public string DoctorPhoneNumber { get; set; } public string HospitalName { get; set; }     } public interface PCPWXMLDTOMapper     { Dictionary<string, string> GetPropertyXMLMap(); String GetMainXMLTagName();     } public class EmergencyContactXMLDTOMapper : PCPWXMLDTOMapper     { public Dictionary<string, string> GetPropertyXMLMap()         { return new Dictionary<string, string>             {                 { "FileNb", "XFileNb" },                 { "ContactName", "XContactName"},                 { "ContactPhoneNumber", "XContactPhoneNumber" },                 { "Relationship", "XRelationship" },                 { "DoctorName", "XDoctorName" },                 { "DoctorPhoneNumber", "XDoctorPhoneNumber" },                 { "HospitalName", "XHospitalName" },             };         } public String GetMainXMLTagName()         { return "EmergencyContact";         }     } } span.fullpost {display:none;}

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  • Logitech C270 webcam reading from wrong position

    - by MrGoodguy69
    Have got my Logitech C270 webcam working out of the box for cheese, skype and it's working fine, sound as well. But when I go to a website stream it is looking for my camera here; file/dev/video0 the trouble is everything else is say my webcam is here instead; file/dev/video1 So it works ok on Skype with those settings but other sites are looking for cam in the wrong place? Thanks now for any advice :)

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  • Reading Excel using OpenXML

    public DataTable ReadDataFromExcel()        {         string filePath = @"c:/temp/temp.xlsx";            using (SpreadsheetDocument LobjDocument = SpreadsheetDocument.Open(filePath, false))            {                            WorkbookPart LobjWorkbookPart = LobjDocument.WorkbookPart;                Sheet LobjSheetToImport = LobjWorkbookPart.Workbook.Descendants<Sheet>().First<Sheet>();                WorksheetPart LobjWorksheetPart = (WorksheetPart)(LobjWorkbookPart.GetPartById(LobjSheetToImport.Id));                SheetData LobjSheetData = LobjWorksheetPart.Worksheet.Elements<SheetData>().First();                //Read only the data rows and skip all the header rows.                int LiRowIterator = 1;                //  for progress bar                int LiTotal = LobjSheetData.Elements<Row>().Count() - MobjImportMapper.HeaderRowIndex;                // =================                foreach (Row LobjRowItem in LobjSheetData.Elements<Row>().Skip(6))                {                    DataRow LdrDataRow = LdtExcelData.NewRow();                    int LiColumnIndex = 0;                    int LiHasData = 0;                    LdrDataRow[LiColumnIndex] = LobjRowItem.RowIndex; //LiRowIterator;                    LiColumnIndex++;                    //TODO: handle restriction of column range.                    foreach (Cell LobjCellItem in LobjRowItem.Elements<Cell>().Where(PobjCell                        => ImportHelper.GetColumnIndexFromExcelColumnName(ImportHelper.GetColumnName(PobjCell.CellReference))                        <= MobjImportMapper.LastColumnIndex))                    {                                             // Gets the column index of the cell with data                        int LiCellColumnIndex = 10;                        if (LiColumnIndex < LiCellColumnIndex)                        {                            do                            {                                LdrDataRow[LiColumnIndex] = string.Empty;                                LiColumnIndex++;                            }                            while (LiColumnIndex < LiCellColumnIndex);                        }                        string LstrCellValue = LobjCellItem.InnerText;                        if (LobjCellItem.DataType != null)                        {                            switch (LobjCellItem.DataType.Value)                            {                                case CellValues.SharedString:                                    var LobjStringTable = LobjWorkbookPart.GetPartsOfType<SharedStringTablePart>().FirstOrDefault();                                    DocumentFormat.OpenXml.OpenXmlElement LXMLElment = null;                                    string LstrXMLString = String.Empty;                                    if (LobjStringTable != null)                                    {                                        LstrXMLString =                                            LobjStringTable.SharedStringTable.ElementAt(int.Parse(LstrCellValue, CultureInfo.InvariantCulture)).InnerXml;                                        if (LstrXMLString.IndexOf("<x:rPh", StringComparison.CurrentCulture) != -1)                                        {                                            LXMLElment = LobjStringTable.SharedStringTable.ElementAt(int.Parse(LstrCellValue, CultureInfo.InvariantCulture)).FirstChild;                                            LstrCellValue = LXMLElment.InnerText;                                        }                                        else                                        {                                            LstrCellValue = LobjStringTable.SharedStringTable.ElementAt(int.Parse(LstrCellValue, CultureInfo.InvariantCulture)).InnerText;                                        }                                    }                                    break;                                default:                                    break;                            }                        }                        LdrDataRow[LiColumnIndex] = LstrCellValue.Trim();                        if (!string.IsNullOrEmpty(LstrCellValue))                            LiHasData++;                       LiColumnIndex++;                    }                    if (LiHasData > 0)                    {                        LiRowIterator++;                        LdtExcelData.Rows.Add(LdrDataRow);                    }                }            }                       return LdtExcelData;        } span.fullpost {display:none;}

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  • Storing and reading file paths from _TCHAR *argv[]

    - by ArsenArsen
    How to convert from _TCHAR* to "" and to keep all : and /? I tried: int _tmain(int argc, _TCHAR* argv[]) { if(!argv[1]){ std::cout<<"No Variables.\r\n"; system("PAUSE"); return 0; std::exit; } std::cout<<"Path: "<<argv[1]<<"\r\n"; system("PAUSE"); return 0; } But, output is either "No variables." or "Path: C" (when I changed _TCHAR to const char and char) or either "Path: 00038706"

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  • C++ Database vs Reading Files

    - by Ohmages
    Ive been programing a C++ game/server for the past year. I have been using MYSQL for character logins, items, monsters, etc, etc. (im on windows). My question is, what are some of the databases that some big time developers use. IE. Battle.net, Diablo II, Diablo III, mythos, hellgate , etc, etc, etc. Do they have their own database they built? Or do they use an existing framework for logins, and character transfers. I do know that in diablo II, they use character files to to transfer characters into the game world. But what about the login into battle.net. Would it be wiser for me to stick with MYSQL, or is there something out there faster and more stable, or should I create a login type of system that looks through a file to see if you provided the correct password. Can't wait to get some replies. Thanks! PS. Currently the framework is much like battle.net, where you login into a lobby, create, and join games. The game server/lobby server are different servers too. So im just wondering about the lobby server for logins because I'm expecting several hundred thousand connections/logins.

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  • Open source Entity-Component game [on hold]

    - by Papavoikos
    I've been reading a lot about entity-component design but every article talks about the philosophy behind such design, leaving a lot of details and implementations outside. I'm looking for an open source game that uses the entity-component design so I can study the concrete implementations and see how they deal with things such as How (and if) they deal with inter-component communication How much logic each component has or doesn't have How a subsystem can change it's behavior depending on an entity's state (the screen darkens depending on the player's health)

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