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  • Make sure bad patterns don't come back after refactoring

    - by Let_Me_Be
    I'm refactoring an old C code. The code has absolutely no layered architecture (everything is being accessed by everything) and I'm trying to change that. I would like to cut direct access to structure members (at least write for now) and only allow access through access functions. Is there some tool (or perhaps directly the compiler) that could check this rule for me? I need this since I'm maintaining a fork and the upstream isn't very concerned with code quality.

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  • Silverlight and M-V-VM - Where should a timer live?

    - by Bill Jeeves
    I'm creating a simple monitoring tool in Silverlight. It talks to a web service to retrieve the status information and store it in the ViewModel. This needs to happen once per minute so I'm going to add a timer for this purpose (probably a DispatcherTimer). My question is, where should the timer go in an M-V-VM architecture? In the ViewModel or the View?

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  • Is "campaign_$" a bad name for a SQL column?

    - by Summer
    PostgreSQL has allowed me to name a column "campaign_$". I like the name because it's short and to the point, and other potential names like "campaign_receipts" seem longer and less clear. BUT, I wonder if I'll eventually regret putting a $ symbol in a column name, either in PHP or in some other distant part of the architecture. Should I just stick to letters and underscores? Thanks!

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  • Best way to send floating point numbers from .NET to Java and back

    - by Evgeny
    I'm writing a .NET application that will make an RPC call to a Java application (via a message queue). The data sent in both directions will be large arrays of floating-point numbers. What is the best way to serialize them to send them across the wire? I'd like something more compact than text, but architecture-independent as the server may not be an x86 machine. The Java application can be changed as needed.

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  • Another Memory Alignment Question?

    - by utxeeeee
    I understand why data need to be aligned (and all the efforts made to accomplish it like padding) so we can reduce the number of memory accesses but this assumes that processor just can fetch addresses multiples of 4(supposing we are using a 32-bit architecture). And because of that assumption we need to align memory and my question is why we can just access addresses multiple of 4(efficiency, hardware restriction, another one)? Which is the advantages of doing this? Why cannot we access all the addresses available? hugs

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  • What is going to be "the next Hype" ? [closed]

    - by kabado
    I know it's a very vague question, but maybe the answers could act like a poll about what could possibly be the next big event in computer science. A new language ? A new technology ? A new architecture ? A new business model ? Please provide details, what is it and why do you think it's going to rule the world.

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  • PyQt4 plugin in c++ application

    - by veverica17
    How is it posible to load python script as plugin in qt based application? The basic idea would be to make a class in c++ class b { virtual void method1(); virtual void method2(); } and 'somehow' inherit it in python like class c(b): def method1: #do something def method2: #do something I need to be able to modify the gui from python( add buttons to some widgets made in c++ with qt ). Basicaly something similiar to (gedit, blender, etc) plugin architecture with qt

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  • C++ dynamic type construction and detection

    - by KneLL
    There was an interesting problem in C++, but it concerns more likely architecture. There are many (10, 20, 40, etc) classes that describe some characteristics (mix-in classes), for exmaple: struct Base { virtual ~Base() {} }; struct A : virtual public Base { int size; }; struct B : virtual public Base { float x, y; }; struct C : virtual public Base { bool some_bool_state; }; struct D : virtual public Base { string str; } // .... Primary module declares and exports a function (for simplicity just function declarations without classes): // .h file void operate(Base *pBase); // .cpp file void operate(Base *pBase) { // .... } Any other module can has a code like this: #include "mixins.h" #include "primary.h" class obj1_t : public A, public C, public D {}; class obj2_t : public B, public D {}; // ... void Pass() { obj1_t obj1; obj2_t obj2; operate(&obj1); operate(&obj2); } The question is how to know what the real type of given object in operate() without dynamic_cast and any type information in classes (constants, etc)? Function operate() is used with big array of objects in small time periods and dynamic_cast is too slow for it. And I don't want to include constants (enum obj_type { ... }) because this is not OOP-way. // module operate.cpp void some_operate(Base *pBase) { processA(pBase); processB(pBase); } void processA(A *pA) { } void processB(B *pB) { } I cannot directly pass a pBase to these functions. And it's impossible to have all possible combinations of classes, because I can add new classes just by including new .h files. As one of solutions that comed to mind, in editor application I can use a composite container: struct CompositeObject { vector<Base *pBase> parts; }; But editor does not need a time optimization and can use dynamic_cast for parts to determine the exact type. In operate() I cannot use this solution. So, is it possible to not use a dynamic_cast and type information to solve this problem? Or maybe I should use another architecture?

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  • Making many network shares appear as one

    - by jimbojw
    Givens: disk is cheap, and there's plenty lying around on various computers around the corporate intranet redundant contiguous large storage volumes are expensive Problem: It would be fantastic to have a single entry point (drive letter, network path) that presents all this space as one contiguous filesystem, effectively abstracting the disk and network architecture from the paths presented to users. Does anyone know how to implement such a solution? I'm open to Windows and non-windows solutions, free and proprietary.

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  • Is this a correct syntax (c code found on wikipedia)?

    - by m4design
    I just found this code on wikipedia. Link: http://en.wikipedia.org/wiki/Sizeof#Use The code: /* the following code illustrates the use of sizeof * with variables and expressions (no parentheses needed), * and with type names (parentheses needed) */ char c; printf("%zu,%zu", sizeof c, sizeof(int)); It states that: "The z prefix should be used to print it, because the actual size can differ on each architecture." I tried it on my compiler, but it gives the following result: 'zu,zu'

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  • would there be such case of jumping, if yes how?

    - by Pooria
    I have an issue in the mind and that is since the jump instruction changes EIP register by adding signed offsets to it(if I'm not making a mistake here), on IA-32 architecture how would going upward in memory from location 0x7FFFFFFF(biggest positive number in signed logic) to 0x80000000(least negative number in signed logic) be possible? or maybe there shouldn't be such jump due to the nature of signed logic?

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  • More RAM vs. more servers [closed]

    - by user357972
    I was recently asked "Do you know when to decide between going for more RAM or more servers?" (in the context of scaling data mining applications). I had no idea, so what are some ways to decide? I have very little knowledge of architecture and scaling (my understanding of computer memory and what a server does is limited to the high-level basics), so tips on learning more about these things in general are also very welcome.

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  • C# start a static thread

    - by user595605
    I have a Queue of items I want to process in a thread, and any instance of a class can add items to the Queue to be processed. My idea for doing this is to have a static Thread in the class that processes the items, the only problem is that I don't know where to start this thread, since I can't start it in its initialization. Is there a way I can start a static thread? Or should I be changing the architecture completely?

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  • Error when trying to open SQL Maintenance Plan - SSMS 2008

    - by alex
    If I open SSMS on my client machine, connect to our SQL server, and try and open a maintenance plan on there, I get this error: TITLE: Microsoft SQL Server Management Studio Could not load file or assembly 'msddsp, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. (Microsoft.DataTransformationServices.Design) ------------------------------ BUTTONS: OK If i try the same thing directly on the server, nothing happens (no errors or anything)

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  • SQL Server 2008 R2 Enterprise won't install on Windows 2008 R2 Enterprise

    - by Carlos Paulino
    I've been trying to install SQL Server on a new Windows Server 2008. I have tried everything but I haven't been able to narrow down the problem. When the installation fails I get " Exit code (Decimal): -2068643839". The problem with this is that according to Microsoft this is a generic error code. I follow their guide to look into the detail.txt inside C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\ But I can't find something that specifies the exact error. Any suggestions ? Thanks in advanced. I uploaded to detail.txt to http://www.megaupload.com/?d=0MV46SZH because it is to big to paste here. Below is the summary.txt ---------- Overall summary: Final result: SQL Server installation failed. To continue, investigate the reason for the failure, correct the problem, uninstall SQL Server, and then rerun SQL Server Setup. Exit code (Decimal): -2068643839 Exit facility code: 1203 Exit error code: 1 Exit message: SQL Server installation failed. To continue, investigate the reason for the failure, correct the problem, uninstall SQL Server, and then rerun SQL Server Setup. Start time: 2011-02-28 11:29:56 End time: 2011-02-28 11:34:45 Requested action: Install Machine Properties: Machine name: SA-SERVER Machine processor count: 8 OS version: Windows Server 2008 R2 OS service pack: Service Pack 1 OS region: United States OS language: English (United States) OS architecture: x64 Process architecture: 64 Bit OS clustered: No Product features discovered: Product Instance Instance ID Feature Language Edition Version Clustered Package properties: Description: SQL Server Database Services 2008 R2 ProductName: SQL Server 2008 R2 Type: RTM Version: 10 SPLevel: 0 Installation location: F:\x64\setup\ Installation edition: ENTERPRISE User Input Settings: ACTION: Install ADDCURRENTUSERASSQLADMIN: True AGTSVCACCOUNT: NT AUTHORITY\SYSTEM AGTSVCPASSWORD: ***** AGTSVCSTARTUPTYPE: Manual ASBACKUPDIR: Backup ASCOLLATION: Latin1_General_CI_AS ASCONFIGDIR: Config ASDATADIR: Data ASDOMAINGROUP: <empty> ASLOGDIR: Log ASPROVIDERMSOLAP: 1 ASSVCACCOUNT: <empty> ASSVCPASSWORD: ***** ASSVCSTARTUPTYPE: Automatic ASSYSADMINACCOUNTS: <empty> ASTEMPDIR: Temp BROWSERSVCSTARTUPTYPE: Disabled CONFIGURATIONFILE: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20110228_112601\ConfigurationFile.ini CUSOURCE: ENABLERANU: False ENU: True ERRORREPORTING: False FARMACCOUNT: <empty> FARMADMINPORT: 0 FARMPASSWORD: ***** FEATURES: SQLENGINE,BIDS,CONN,IS,BC,SDK,SSMS,ADV_SSMS,SNAC_SDK,OCS FILESTREAMLEVEL: 0 FILESTREAMSHARENAME: <empty> FTSVCACCOUNT: <empty> FTSVCPASSWORD: ***** HELP: False IACCEPTSQLSERVERLICENSETERMS: False INDICATEPROGRESS: False INSTALLSHAREDDIR: C:\Program Files\Microsoft SQL Server\ INSTALLSHAREDWOWDIR: C:\Program Files (x86)\Microsoft SQL Server\ INSTALLSQLDATADIR: <empty> INSTANCEDIR: D:\SQLServer INSTANCEID: MSSQLSERVER INSTANCENAME: MSSQLSERVER ISSVCACCOUNT: NT AUTHORITY\SYSTEM ISSVCPASSWORD: ***** ISSVCSTARTUPTYPE: Automatic NPENABLED: 0 PASSPHRASE: ***** PCUSOURCE: PID: ***** QUIET: False QUIETSIMPLE: False ROLE: AllFeatures_WithDefaults RSINSTALLMODE: FilesOnlyMode RSSVCACCOUNT: NT AUTHORITY\NETWORK SERVICE RSSVCPASSWORD: ***** RSSVCSTARTUPTYPE: Automatic SAPWD: ***** SECURITYMODE: SQL SQLBACKUPDIR: <empty> SQLCOLLATION: SQL_Latin1_General_CP1_CI_AS SQLSVCACCOUNT: NT AUTHORITY\SYSTEM SQLSVCPASSWORD: ***** SQLSVCSTARTUPTYPE: Automatic SQLSYSADMINACCOUNTS: SA-SERVER\Administrator SQLTEMPDBDIR: <empty> SQLTEMPDBLOGDIR: <empty> SQLUSERDBDIR: <empty> SQLUSERDBLOGDIR: <empty> SQMREPORTING: False TCPENABLED: 1 UIMODE: Normal X86: False Configuration file: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20110228_112601\ConfigurationFile.ini Detailed results: Feature: Database Engine Services Status: Failed: see logs for details MSI status: Passed Configuration status: Passed Feature: SQL Client Connectivity SDK Status: Failed: see logs for details MSI status: Passed Configuration status: Passed Feature: Integration Services Status: Failed: see logs for details MSI status: Passed Configuration status: Passed Feature: Client Tools Connectivity Status: Failed: see logs for details MSI status: Passed Configuration status: Passed Feature: Management Tools - Complete Status: Failed: see logs for details MSI status: Passed Configuration status: Passed Feature: Management Tools - Basic Status: Failed: see logs for details MSI status: Passed Configuration status: Passed Feature: Client Tools SDK Status: Failed: see logs for details MSI status: Passed Configuration status: Passed Feature: Client Tools Backwards Compatibility Status: Failed: see logs for details MSI status: Passed Configuration status: Passed Feature: Business Intelligence Development Studio Status: Failed: see logs for details MSI status: Passed Configuration status: Passed Feature: Microsoft Sync Framework Status: Failed: see logs for details MSI status: Passed Configuration status: Passed Rules with failures: Global rules: Scenario specific rules: Rules report file: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20110228_112601\SystemConfigurationCheck_Report.htm

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  • Where is definitive download location MBSA's "wsusscn2.cab" file for offline mode scans?

    - by Chris W. Rea
    I'm running Microsoft Baseline Security Analyzer 2.1 against some servers that don't have outbound access to the Internet, by design of firewall restrictions, and therefore I'm wishing to run MBSA in offline mode. In order to do so, I need the list of updates in the file named "wsusscn2.cab". Is there a well-known page or URL at Microsoft for downloading the most up-to-date version of that file for MBSA offline mode? Thank you.

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  • Help with search and view using mdfind and qlmanage?

    - by Michael
    Hi, I'm trying to use mdfind and qlmanage to find and display files with quicklook. So far I have this, but am having trouble getting the results from mdfind formatted correctly to pass to qlmanage: tagSearch=$(mdfind -onlyin '/Users/username/Documents/Data' -interpret 'tag:[REFERENCE] Design' | sed -e 's/.*/\"&\" /' | perl -pe 's/\n/ /' ); qlmanage -p $tagSearch Any help would be appreciated!

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  • Ethernet switch capacity question

    - by Andrew Queisser
    We're looking at hooking up 48 small embedded systems with 10/100 Ethernet ports to an Ethernet switch and then have that switch talk to a server upstream via a faster connection. I have a couple of questions about that scenario: What kind of upstream connection is best (fiber, other?) Would it be reasonable to download 1GB/hour from each of the 48 systems concurrently? We'd be using some kind of TCP based protocol of our own design. Thanks, Andrew

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  • Does anyone own a compaq 610? Fan Issues.

    - by Dave
    Hi, I've just purchased 2 HP compaq 610s and both have the same problem, that the fan is constantly on and the base is fairly hot. HP assures me that this is unusual and that I should return them as DOA. Becasue both laptops have this issue, I think that it may be a design flaw rather than a one off problem. Can any 610 owners comment? Is their fan constantly on too?

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  • Possible to get cleartext password?

    - by Farhan
    I have hosting service hosted on more than 20+ Plesk servers, version 11. As in the previous versions, the passwords were not encrypted, then if i had to design some tools to manage the hosting accounts, i just picked up the cleartext passwords from the Database. but as now the passwords are encrypted, is there any way i can decrypt the passwords? through API or any other way so that i can integrate my php based hosting management with plesk 11?

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