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  • Why won't my code segfault on Windows 7?

    - by Trevor
    This is an unusual question to ask but here goes: In my code, I accidentally dereference NULL somewhere. But instead of the application crashing with a segfault, it seems to stop execution of the current function and just return control back to the UI. This makes debugging difficult because I would normally like to be alerted to the crash so I can attach a debugger. What could be causing this? Specifically, my code is an ODBC Driver (ie. a DLL). My test application is ODBC Test (odbct32w.exe) which allows me to explicitly call the ODBC API functions in my DLL. When I call one of the functions which has a known segfault, instead of crashing the application, ODBC Test simply returns control to the UI without printing the result of the function call. I can then call any function in my driver again. I do know that technically the application calls the ODBC driver manager which loads and calls the functions in my driver. But that is beside the point as my segfault (or whatever is happening) causes the driver manager function to not return either (as evidenced by the application not printing a result). One of my co-workers with a similar machine experiences this same problem while another does not but we have not been able to determine any specific differences.

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  • C Map String to Function

    - by Scriptonaut
    So, I'm making a Unix minishell, and have come to a roadblock. I need to be able to execute built-in functions, so I made a function: int exec_if_built_in(char **args) It takes an array of strings(the first being the command, and the rest being arguments). For non built-in commands I simply use something like execvp, however I need to find a way to map the first string to a function. I was thinking of making two arrays, one of strings, and another with their corresponding function pointers. However, since many of these functions will be different(return and accept different things), this approach won't work. I also thought of making an array of structs with a name property and a function pointer property, however once again due to the varied nature of the functions I'll be using, this won't work. So, what's the best way to execute a function based on the input of a string? How do I map a string to a certain function? I'm not very familiar with function pointers so I may be missing something. Thank you guys for the help :)

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  • Is it possible in SQLAlchemy to filter by a database function or stored procedure?

    - by Rico Suave
    We're using SQLalchemy in a project with a legacy database. The database has functions/stored procedures. In the past we used raw SQL and we could use these functions as filters in our queries. I would like to do the same for SQLAlchemy queries if possible. I have read about the @hybrid_property, but some of these functions need one or more parameters, for example; I have a User model that has a JOIN to a bunch of historical records. These historical records for this user, have a date and a debit and credit field, so we can look up the balance of a user at a specific point in time, by doing a SUM(credit) - SUM(debit) up until the given date. We have a database function for that called dbo.Balance(user_id, date_time). I can use this to check the balance of a user at a given point in time. I would like to use this as a criterium in a query, to select only users that have a negative balance at a specific date/time. selection = users.filter(coalesce(Users.status, 0) == 1, coalesce(Users.no_reminders, 0) == 0, dbo.pplBalance(Users.user_id, datetime.datetime.now()) < -0.01).all() This is of course a non-working example, just for you to get the gist of what I'd like to do. The solution looks to be to use hybrd properties, but as I mentioned above, these only work without parameters (as they are properties, not methods). Any suggestions on how to implement something like this (if it's even possible) are welcome. Thanks,

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  • Mock implementations in C++

    - by forneo
    Hi guys, I need a mock implementation of a class - for testing purposes - and I'm wondering how I should best go about doing that. I can think of two general ways: Create an interface that contains all public functions of the class as pure virtual functions, then create a mock class by deriving from it. Mark all functions (well, at least all that are to be mocked) as virtual. I'm used to doing it the first way in Java, and it's quite common too (probably since they have a dedicated interface type). But I've hardly ever seen such interface-heavy designs in C++, thus I'm wondering. The second way will probably work, but I can't help but think of it as kind of ugly. Is anybody doing that? If I follow the first way, I need some naming assistance. I have an audio system that is responsible for loading sound files and playing the loaded tracks. I'm using OpenAL for that, thus I've called the interface "Audio" and the implementation "OpenALAudio". However, this implies that all OpenAL-specific code has to go into that class, which feels kind of limiting. An alternative would be to leave the class' name "Audio" and find a different one for the interface, e.g. "AudioInterface" or "IAudio". Which would you suggest, and why?

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  • possible solutions of the warning

    - by lego69
    Hello, I have a very large code, that's why I can't post here all my code, can somebody explain what might be a problem if I have an error incompatible pointer type and give me several ways to solve it, thanks in advance just small clarification: I'm workin with pointers to functions ptrLine createBasicLine(){ DECLARE_RESULT_ALLOCATE_AND_CHECK(ptrLine, Line); result->callsHistory = listCreate(copyCall,destroyCall); <-here result->messagesHistory = listCreate(copyMessage,destroyMessage); <-and here result->linesFeature = NULL; result->strNumber = NULL; result->lastBill = 0; result->lineType = MTM_REGULAR_LINE; result->nCallTime = 0; result->nMessages = 0; result->rateForCalls = 0; result->rateForMessage = 0; return result; } copyCall,destroyCall - pointers to functions /** * Allocates a new List. The list starts empty. * * @param copyElement * Function pointer to be used for copying elements into the list or when * copying the list. * @param freeElement * Function pointer to be used for removing elements from the list * @return * NULL - if one of the parameters is NULL or allocations failed. * A new List in case of success. */ List listCreate(CopyListElement copyElement, FreeListElement freeElement); definitions of the functions ptrCall (*createCall)() = createNumberContainer; void (*destroyCall)(ptrCall) = destroyNumberContainer; ptrCall (*copyCall)(ptrCall) = copyNumberContainer;

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  • binding list variable one after another

    - by prince23
    hi, this is my class public class Users { public string Name { get; set; } public int Age { get; set; } public string Gender { get; set; } public string Country { get; set; } } i am defing an list variable List<Users> myList = new List<Users> i have four functions each one returing a string array {of data content like, names, age, gender, country} **functions names** FunNames(); FunAge(); Fungender(); Funcountry(); now i need to bind these these return values of all these functions into list one by one like. myList =FunNames(); myList =FunAge(); myList Fungender(); ..... hope my Question is clear. any help would be great thank you.

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  • Memcached Debuging/Server Logs Monitor the Memcached Servers?

    - by user1179459
    I have chat engine which is based on the Memcached variables, putting them into arrays and reading them in other end via jquery, which works fine 95% of the times, however when the server load is high memcached (presume its the memcached) the crash and browser gets stucks up. I dont think its jquery issue since this only happens when the server load is very high. I need a way to monitor the memcached servers or somehow write a log file into where the fails/errors comes in... Any idea on how i can do this ? or any idea why memcached servers fails ? I run the memcached as follows $GLOBALS['MemCached'] = FALSE; $GLOBALS['MemCached'] = new Memcache; $GLOBALS['MemCached']->pconnect('localhost', 11211); My memcached config is as follows #! /bin/sh # # chkconfig: - 55 45 # description: The memcached daemon is a network memory cache service. # processname: memcached # config: /etc/sysconfig/memcached # pidfile: /var/run/memcached/memcached.pid # Standard LSB functions #. /lib/lsb/init-functions # Source function library. . /etc/init.d/functions PORT=11211 USER=memcached MAXCONN=1024 CACHESIZE=128 OPTIONS="" if [ -f /etc/sysconfig/memcached ];then . /etc/sysconfig/memcached fi # Check that networking is up. . /etc/sysconfig/network if [ "$NETWORKING" = "no" ] then exit 0 fi RETVAL=0 prog="memcached" pidfile=${PIDFILE-/var/run/memcached/memcached.pid} lockfile=${LOCKFILE-/var/lock/subsys/memcached} start () { echo -n $"Starting $prog: " # Ensure that /var/run/memcached has proper permissions if [ "`stat -c %U /var/run/memcached`" != "$USER" ]; then chown $USER /var/run/memcached fi daemon --pidfile ${pidfile} memcached -d -p $PORT -u $USER -m $CACHESIZE -c $MAXCONN -P ${pidfile} $OPTIONS RETVAL=$? echo [ $RETVAL -eq 0 ] && touch ${lockfile} } stop () { echo -n $"Stopping $prog: " killproc -p ${pidfile} /usr/bin/memcached RETVAL=$? echo if [ $RETVAL -eq 0 ] ; then rm -f ${lockfile} ${pidfile} fi } restart () { stop start } # See how we were called. case "$1" in start) start ;; stop) stop ;; status) status -p ${pidfile} memcached RETVAL=$? ;; restart|reload|force-reload) restart ;; condrestart|try-restart) [ -f ${lockfile} ] && restart || : ;; *) echo $"Usage: $0 {start|stop|status|restart|reload|force-reload|condrestart|try-restart}" RETVAL=2 ;; esac exit $RETVAL

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  • How can I get Opera speed-dial and password management features in other browsers?

    - by Howard Guo
    I heavily rely on Opera's speed dial and password management features. Lack of these two features is really stopping me from switching to another web browser such as Chrome or Firefox. Opera's password management has two unique characteristics which I rely on heavily: It saves passwords on all pages, (apparently) despite the page's meta data asking not to save passwords. It offers keyboard shortcut and button to automatically fill in username/passwords and all other fields in a login form, then automatically submit the form. (So I'm only one key/click away from logging into a website) How can I get those functions in other browsers? Thank you! Edit: Reason being that I use other web browsers at work and I wish they could have those functions.

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  • Executing Secondary Applications

    - by JooBlow
    I have an application I am attempting to make "portable". The application contains a lot of secondary utility functions that I would like to execute on external files(from the app). I tried adding them in the build process but I didn't get any "Executables" for them(just the main one and a few others). Is there a way to get these to excute? They are basically command line utility functions to process some text files but use large files in the distribution and are also used by the main application. Thanks

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  • Squirrelmail got error after installation whm

    - by Pleerock
    Just now installed whm/cpanel, created some accounts, created mail account in one of them and entered squirrelmail to check the mail. Unfortunately it gives me an error: Warning: fsockopen() [function.fsockopen]: php_network_getaddresses: getaddrinfo failed: Name or service not known in /usr/local/cpanel/base/3rdparty/squirrelmail/plugins/login_auth/functions.php on line 129 Warning: fsockopen() [function.fsockopen]: unable to connect to localhost:143 (php_network_getaddresses: getaddrinfo failed: Name or service not known) in /usr/local/cpanel/base/3rdparty/squirrelmail/plugins/login_auth/functions.php on line 129 How do I fix it? I don't know exactly, but I read some sites and maybe the problem in dns? I changed ns1.com to ns1.myhost.com in a Basic cPanel & WHM Setup P.S. Im sure that it server configuration problem, not squirrelmail, other mail clients are not working too..

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  • Default prolog for all ZSH scripts?

    - by Igor Spasic
    I have a file that contains several helper functions, meant to be used only in other ZSH scripts. I do not want them to be loaded with my profile. To make these functions available in my script, I would need to source this file. Is it somehow possible to have automatic prolog script (or pre-script) loaded before all my ZSH scripts? My current idea is to alias -s zsh extension to custom function that those all this for me: concatenate prolog file and current script calls zsh with such modified input but for now I am somehow not able to do this (haven't sleep for almost a day). Please, does anyone have a working solution?

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  • sudoer scheme for a web developer that retains future control of a server?

    - by Tchalvak
    Background I have a server that I'm looking to set up, and provide access to another web developer. I don't want to put many constraints on him, though I wouldn't mind isolating the site that he'll be developing from others on the server that I will develop. The problem Mainly what I want is to make sure that I retain control over the server in the future. I want to reserve the ability to create/promote/demote and other administrative functions that don't deal with web software. If I make him an admin, he can sudo su - and become root and remove root control from me, for example. What is a good setup for the sudoers file so that he can do things like: *install software (through apt-get) restart apache access mysql configure mysql/apache reboot edit web development configuration type files in /etc * And can't do things like: take away other admin permissions change the root password have control over other security/administrative functions Example sudoer files that accomplish something like that could be useful, I'm sure that people have needed to do this before.

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  • Owner of uploads directory is `www-data` but this prevents FTP access via PHP scripts

    - by letseatfood
    To allow write access to Apache, I needed to chown www-data:www-data /var/www/mysite/uploads to my site's upload folder. This allows me to delete files from the folder via unlink() in a PHP script. Unfortunately, this prevents another PHP script, which uses FTP functions, from working. I think it is because the FTP user is mike and now that the uploads directory is owned by www-data, mike cannot access it. I added mike to the group www-data, but this does not fix the issue. Can somebody advise me on how to allow PHP FTP functions to work in addition to file deletion using PHP's unlink() function?

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  • IE9 HANGS: jquery based webapp hanging ONLY with IE9

    - by Daniele B
    I'm stuck on this issue since days... This is the site I'm talking about. It is a webapp which makes large use of backbone, visualsearch, jquery plugins. This website is not working at the moment with IE8, but it's fine that it works with IE9...if just it would! What happens is that the website hangs when loaded ONLY with IE9 and (this is bizarre!) if the profiler tool of IE9 developer tools is ON it doesn't!! It also happens to oher people (I was notified of that) so I'm pretty sure it's not an issue linked to my browser settings. It makes me think about an error which has something to do with delays, or iterative functions which, in presence of profiler, are forced to delay bte cycles and so to leave free time slots to other functions which render the page. I can update with more details if needed. thanks.

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  • How can I exclude a file in a folder from basic auth (regex help)?

    - by simon180
    Hi I have a folder on my site which contains admin files and I've added basic auth following a little unwanted attention. This works fine however a couple of the admin functions won't work through basic auth as they handle file uploads and so I want to exclude these files from the auth. It shouldn't have any security implications as any rogue user wouldn't be able to access the pages that could create a session to use these functions. I am using the following basic code to exclude a file: <FilesMatch "(index.php\/myadminfolder\/myurl\/myaction/someotherstuff?)$"> Satisfy Any Order allow,deny Allow from all Deny from none </FilesMatch> The URL exclusion is not working. The URL to exclude is in the form: index.php/directory/subdirectory/action/uniqueid/blah What is the correct URL string to add to FilesMatch to exclude any files that start with the pattern of index.php/directory/subdirectory/action - regardless of what comes after action? Thanks Simon

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  • samsung netbook OS for clean install

    - by Alex
    Hello - I recently had a problem with a corrupted registry on a samsung N120. When all else failed i reformatted the drive. However having bought the machine with windows home ed pre-installed, I didn't have original windows disck for the clean install. So I managed to install another edition of windows XP (PRO this time). Now windows opens, but several key functions are missing. e.g.: screen resolution - will not allow me any but 800x600 resolution native buttons - such as the fn + screen brightness is not working at all. Any suggestions please? ? Is there a way to get the samsung OS online (since I do have the manufacturer's/installed product key)? thanks PS: It has been my intention to install ubuntu, but i need to know i will not lose functions like screen brightness, volume, and the trackpad's scrolling function. I'd be happy to bypass the windows option if i was sure to have full keyboard/samsung functionality

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  • SQL SERVER – Concat Strings in SQL Server using T-SQL – SQL in Sixty Seconds #035 – Video

    - by pinaldave
    Concatenating  string is one of the most common tasks in SQL Server and every developer has to come across it. We have to concat the string when we have to see the display full name of the person by first name and last name. In this video we will see various methods to concatenate the strings. SQL Server 2012 has introduced new function CONCAT which concatenates the strings much efficiently. When we concat values with ‘+’ in SQL Server we have to make sure that values are in string format. However, when we attempt to concat integer we have to convert the integers to a string or else it will throw an error. However, with the newly introduce the function of CONCAT in SQL Server 2012 we do not have to worry about this kind of issue. It concatenates strings and integers without casting or converting them. You can specify various values as a parameter to CONCAT functions and it concatenates them together. Let us see how to concat the values in Sixty Seconds: Here is the script which is used in the video. -- Method 1: Concatenating two strings SELECT 'FirstName' + ' ' + 'LastName' AS FullName -- Method 2: Concatenating two Numbers SELECT CAST(1 AS VARCHAR(10)) + ' ' + CAST(2 AS VARCHAR(10)) -- Method 3: Concatenating values of table columns SELECT FirstName + ' ' + LastName AS FullName FROM AdventureWorks2012.Person.Person -- Method 4: SQL Server 2012 CONCAT function SELECT CONCAT('FirstName' , ' ' , 'LastName') AS FullName -- Method 5: SQL Server 2012 CONCAT function SELECT CONCAT('FirstName' , ' ' , 1) AS FullName Related Tips in SQL in Sixty Seconds: SQL SERVER – Concat Function in SQL Server – SQL Concatenation String Function – CONCAT() – A Quick Introduction 2012 Functions – FORMAT() and CONCAT() – An Interesting Usage A Quick Trick about SQL Server 2012 CONCAT Function – PRINT A Quick Trick about SQL Server 2012 CONCAT function What would you like to see in the next SQL in Sixty Seconds video? Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Database, Pinal Dave, PostADay, SQL, SQL Authority, SQL in Sixty Seconds, SQL Query, SQL Scripts, SQL Server, SQL Server Management Studio, SQL Tips and Tricks, T SQL, Technology, Video Tagged: Excel

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  • What is ODBC?

    According to Microsoft, ODBC is a specification for a database API.  This API is database and operating system agnostic due to the fact that the primary goal of the ODBC API is to be language-independent. Additionally, the open functions of the API are created by the manufactures of DBMS-specific drivers. Developers can use these exposed functions from within their own custom applications so that they can communicate with DBMS through the language-independent drivers. ODBC Advantages Multiple ODBC drivers for each DBSM Example Oracle’s ODBC Driver Merant’s Oracle Driver Microsoft’s Oracle Driver ODBC Drivers are constantly updated for the latest data types ODBC allows for more control when querying ODBC allows for Isolation Levels ODBC Disadvantages ODBC Requires DSN ODBC is the proxy between an application and a database ODBC is dependent on third party drivers ODBC Transaction Isolation Levels are related to and limited by the transaction management capabilities of the data source. Transaction isolation levels:  READ UNCOMMITTED Data is allowed to be read prior to the committing of a transaction.  READ COMMITTED Data is only accessible after a transaction has completed  REPEATABLE READ The same data value is read during the entire transaction  SERIALIZABLE Transactions have no effect on other transactions

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  • Page debugging got easier in UCM 11g

    - by kyle.hatlestad
    UCM is famous for it's extra parameters you can add to the URL to do different things. You can add &IsJava=1 to get all of the local data and result set information that comes back from the idc_service. You can add &IsSoap=1 and get back a SOAP message with that information. Or &IsJson=1 will send it in JSON format. There are ones that change the display like &coreContentOnly=1 which will hide the footer and navigation on the page. In 10g, you could add &ScriptDebugTrace=1 and it would display the list of resources that were called through includes or eval functions at the bottom of the page. And it would list them in nested order so you could see the order in which they were called and which components overrode each other. But in 11g, that parameter flag no longer works. Instead, you get a much more powerful one called &IsPageDebug=1. When you add that to a page, you get a small gray tab at the bottom right-hand part of the browser window. When you click it, it will expand and let you choose several pieces of information to display. You can select 'idocscript trace' and display the nested includes you used to get with ScriptDebugTrace. You can select 'initial binder' and see the local data and result sets coming back from the service, just as you would with IsJava. But in this display, it formats the results in easy to read tables (instead of raw HDA format). Then you can get the final binder which would contain all of the local data and result sets after executing all of the includes for the display of the page (and not just from the Service call). And then a 'javascript log' for reporting on the javascript functions and times being executed on the page. Together, these new data displays make page debugging much easier in 11g. *Note: This post also applies to Universal Records Management (URM).

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  • Requirement refinement between two levels of specification

    - by user107149
    I am currently working on the definition of the documentation architecture of a system, from customers needs to software/hardware requirements. I encounter a big problem with the level of refinement of requirements. The classic architecture is : PTS -- SSS -- SSDD -- SRS/HRS with PTS : Purshaser Technical Specification SSS : Supplier System Specification SSDD : System Segment Design Description SRS / HRS : Software / Hardware Requirement Specification. Requirements from PTS are reworked in SSS, this document only expressed the needs (no design requirements are defined at this level). Then, the system design is described in SSDD : we allocate requirements from the SSS to functions from the design and functions are then allocated to component (Software or hardware) (we are still at the SSDD level). Finally, for each component, we write one SRS or one HRS. Requirements in SRS or HRS are refinement of requirements from SSS (and traceability matrix are made between these two levels). My problem is the following one : Our system is a complex one, and some of the requirements in the SSS needs to be refined twice to be at the right level in the SRS (means that software people can understand the requirement to make their coding). But, with this document architecture, I can only refine once the requirements from the SSS. The second problem is that only a part of the requirements from the SSS needs to be refined twice. The other part only need one refinement. On the picture below, the green boxes are requirements at the right level for SRS or HRS. And purple boxes are intermediate requirements which can not be included in SSS since they are design requirements. Where can I put these purple requirements ?? Is there someone who has already encountered this problem ? Should I write two documents at SRS level ? Should I include intermediate requirements in SSDD ? Should I includes the two refinement levels (purple and green) in the same SRS document (not sure that's possible since a SRS is only for one component) ??? Thanks for your help and expertise ;-)

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  • Keep basic game physics separate from basic game object? [on hold]

    - by metamorphosis
    If anybody has dealt with a similar situation I'd be interested in your experience/wisdom, I'm developing a 2D game library in C++, I have game objects which have very basic physics, they also have movement classes attached to differing states, for example, a different movement type based on whether the character is jumping, on ice, whatever. In terms of storing velocity and acceleration impulses, are they best held by the object? Or by the associated movement class? The reason I ask is that I can see advantages to both approaches- if you store physics data in the movement class, you have to pass physics information between class instances when a state change occurs (ie. impulses, gravity etc) but the class has total control over whether those physics are updated or not. An obvious example of how this would be useful was if an object was affected by something which caused it to ignore gravity, or something like that. on the other hand if you store the physics data in the object class, it feels more logical, you don't have to go around passing physics impulses and gravity etc, however the control that the movement class has over the object's physics becomes more convoluted. Basically the difference is between: object->physics stacks (acceleration impulses etc) ->physics functions ->movement type <-movement type makes physics function calls through object and object->movement type->physics stacks ->physics functions ->object forwards external physics calls onto movement type ->object transfers physics stacks between movement types when state change occurs Are there best practices here?

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