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  • Bit fields in C ?

    - by maddy
    HI all, Is there anyway by which we can declare variable specifying bit fields on those which are not any members of structures or unions.If not,then is there anyway by which we can just declare a variable by specifying the number of bits it is permitted to use. Thanks maddy

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  • How to set global variables to use everywhere in my application?

    - by user502052
    I am using Ruby on Rails 3 and I would like to set some global variable to use those everywhere in my application. In particular, the domain name. If, for example, my website URL is http://subname.domain.com I would like to set or retrieve the subname.domain.com value in order to use that in my application like this request_uri = "http://#{sub_domain_name}" Where and how I have to state\initialize the sub_domain_name variable or other variables at all?

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  • Can a conforming C implementation #define NULL to be something wacky

    - by janks
    I'm asking because of the discussion that's been provoked in this thread: http://stackoverflow.com/questions/2597142/when-was-the-null-macro-not-0/2597232 Trying to have a serious back-and-forth discussion using comments under other people's replies is not easy or fun. So I'd like to hear what our C experts think without being restricted to 500 characters at a time. The C standard has precious few words to say about NULL and null pointer constants. There's only two relevant sections that I can find. First: 3.2.2.3 Pointers An integral constant expression with the value 0, or such an expression cast to type void * , is called a null pointer constant. If a null pointer constant is assigned to or compared for equality to a pointer, the constant is converted to a pointer of that type. Such a pointer, called a null pointer, is guaranteed to compare unequal to a pointer to any object or function. and second: 4.1.5 Common definitions <stddef.h> The macros are NULL which expands to an implementation-defined null pointer constant; The question is, can NULL expand to an implementation-defined null pointer constant that is different from the ones enumerated in 3.2.2.3? In particular, could it be defined as: #define NULL __builtin_magic_null_pointer Or even: #define NULL ((void*)-1) My reading of 3.2.2.3 is that it specifies that an integral constant expression of 0, and an integral constant expression of 0 cast to type void* must be among the forms of null pointer constant that the implementation recognizes, but that it isn't meant to be an exhaustive list. I believe that the implementation is free to recognize other source constructs as null pointer constants, so long as no other rules are broken. So for example, it is provable that #define NULL (-1) is not a legal definition, because in if (NULL) do_stuff(); do_stuff() must not be called, whereas with if (-1) do_stuff(); do_stuff() must be called; since they are equivalent, this cannot be a legal definition of NULL. But the standard says that integer-to-pointer conversions (and vice-versa) are implementation-defined, therefore it could define the conversion of -1 to a pointer as a conversion that produces a null pointer. In which case if ((void*)-1) would evaluate to false, and all would be well. So what do other people think? I'd ask for everybody to especially keep in mind the "as-if" rule described in 2.1.2.3 Program execution. It's huge and somewhat roundabout, so I won't paste it here, but it essentially says that an implementation merely has to produce the same observable side-effects as are required of the abstract machine described by the standard. It says that any optimizations, transformations, or whatever else the compiler wants to do to your program are perfectly legal so long as the observable side-effects of the program aren't changed by them. So if you are looking to prove that a particular definition of NULL cannot be legal, you'll need to come up with a program that can prove it. Either one like mine that blatantly breaks other clauses in the standard, or one that can legally detect whatever magic the compiler has to do to make the strange NULL definition work. Steve Jessop found an example of way for a program to detect that NULL isn't defined to be one of the two forms of null pointer constants in 3.2.2.3, which is to stringize the constant: #define stringize_helper(x) #x #define stringize(x) stringize_helper(x) Using this macro, one could puts(stringize(NULL)); and "detect" that NULL does not expand to one of the forms in 3.2.2.3. Is that enough to render other definitions illegal? I just don't know. Thanks!

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  • useful customize/enhanced php functions that make thing easy and better

    - by I Like PHP
    Hello All, i like to work in php bcoz it's just amazing language. please share basic, useful, enhanced and customize function that make things better and easy in php and must be used in our all PHP project, i m sharing some of them please share your customize function that may be useful for everyone alternative/ enhanced print_r() and var_dump() function watch( $what ) { echo '<pre>'; if ( is_array( $what ) ) { print_r ( $what ); } else { var_dump ( $what ); } echo '</pre>'; } usage: 1. watch($_POST); // to see all post variable 2. watch($array); // to see any variable may b array, string or a variable enhanced mysql_escape_string() for multidimensional array to prevent sql injection function recursive_escape(&$value) { if (is_array($value)) array_map('recursive_escape', $value); else $value = mysql_escape_string($value); } usage array_map('recursive_escape', $_POST); ---------------------For encoding Get variables-------------------------------------- function nkode($k) { if ( is_array( $k ) ) return array_map("base64_encode",$k); else return base64_encode($k); } ---------------------for decoding varaibles from GET--------------------------------- function dkode($k) { if ( is_array( $k ) ) return array_map("base64_decode",$k); else return base64_decode($k); } Usage <a href="somelink.php?pid=<?php echo nkode($someid)?>"> and on next page(somelink.php) $findID=dkode($_GET[pid]); date convert to mm/dd/yyyy to yyyy-mm-dd( if we use date datatype in mysql) and also change into mm/dd/yyyy to disply on page function dateconvert($date,$func) { if ($func == 1){ //insert conversion list($month, $day, $year) = split('[/.-]', $date); $date = "$year-$month-$day"; return $date; } if ($func == 2){ //output conversion list($year, $month, $day) = split('[-.]', $date); $date = "$month/$day/$year"; return $date; } } usage $firstDate=dateconvert($_POST['firstdate'],1); // for insertion in database $showDate=dateconvert($fetch->date_field,2) // to display on browser to clean(sql injection proof) data before doing some action with that variable function cleandata($data) { $success=0; $data=trim($data); $data=strtolower($data); $data=strip_tags($data); return $data; } usage cleandata($_POST[username]); cleandata($_GET[pid]); please share any basic function that must be used , Thanks

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  • How to create aliases in c#

    - by Gaddigesh
    How do i create aliases in c# Take this scenario class CommandMessages { string IDS_SPEC1_COMPONENT1_MODULE1_STRING1; } say i create an object of this class CommandMessages objCommandMessage = new CommandMessages(); To i need to write lengthy string objCommandMessage.IDS_SPEC1_COMPONENT1_MODULE1_STRING1 every time i access the variable, this is a pain as i am using this variable as a key for a dictionary. Dict[objCommandMessage.IDS_SPEC1_COMPONENT1_MODULE1_STRING1] therefore i should be able to do something like this Dict[str1] where str1 is alias for objCommandMessage.IDS_SPEC1_COMPONENT1_MODULE1_STRING1, How do i do it?

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  • JavaScript Templating Engine

    - by Randy Gurment
    Hi, I would like to create universal templating engine in JavaScript, how to? HTML template <h1><%title1%></h1> <h2><%title2%></h2> JSON file { "title1" : "Hello World!", "title2" : "Hi World!" } Javascript Find in HTML file <%title1% Find in JSON file variable "title1" Replace <%title1% with value of variable "title1" Same for <%title2% Thanks!

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  • Conditionals in WPF.

    - by Carlos
    I have the following question: I have a Boolean variable in a configuration file. If it is true I want a property in textbox control to be setup according to the value of that variable. Try the solution above but it does not work. What am I doing wrong? This is a fragment code: bool isKeyboardAvtive = true; //read from configuration file .... .....

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  • fetch value of ipaddress

    - by neha soni
    i want to get ipaddress of mycomputer in a variable this statement prints ipaddress of my computer but i want to assign it in a varible how can i fetch the value of ipaddress from inet_ntoa(inaddrr(ifr_addr.sa_data)) into an variable ip of char* type . printf("IP Address: %s\n", inet_ntoa(inaddrr(ifr_addr.sa_data)));

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  • Python: try statement single line

    - by Brant
    Is there a way in python to turn a try/except into a single line? something like... b = 'some variable' a = c | b #try statement goes here Where b is a declared variable and c is not... so c would throw an error and a would become b...

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  • Setting CLASSPATH during runtime IKVM

    - by Ciddan
    How do I set a CLASSPATH variable during runtime while using IKVM? I've been trying to do it by using: java.lang.System.setProperty("java.class.path", "whatever"); The class I'm calling requires a configuration file in the classpath to work - and I keep getting errors that seem to indicate that it hasn't gotten its settings. Is the way I'm trying to add variable incorrect?

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  • Grep the whole body of a function

    - by dotancohen
    Supposing I know that someFile.php contains the definition for someFunction(). How would I go about displaying the whole body of the function in stdout? If I know that the body is 10 lines long then I would use cat someFile.php | grep -A 10 "function someFunction" [1] but in reality the function could be any arbitrary length. I figured that with sed I could use Vimesque commands such as /function someFunction<Return>/{<Return>% [2] but I can't figure out exactly how to format it. Ideally, the PHPDoc before the function would be output along with the function. Any help or links to the appropriate fine manual would be appreciated. Thanks! [1] I know that the cat is redundant, but I find this format easier to read. [2] Find the function definition, go to the opening brace, go to the close brace

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  • shell function and environment

    - by Michael
    How in Makefile export variable first then make another variable's expansion? somevar := apple export somevar update = $(shell perl -e 'print "$$ENV{somevar}"') all: @echo $(update) For some reason the expansion takes place first, then export. As a result the output is empty.

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  • How to limit results in a SharePoint XSL query

    - by David
    Hello all, I am creating a SharePoint site that we will use to report issues with trucks used in our business. Linked to the list I have created will be a page that will display an overview of the trucks and a little truck icon will show the trucks current status. Green and the truck is okay (no open issues), Red and the truck have an open issue with status "Undrivable", Orange and there is two issues open that requires the user to look further into the truck before using it and finally a Gray truck for when there is a new issue created that has not been looked into (not sure if it is drivable or not). I have managed to create the "Dashboard" and with my limit XSL/XPATH knowledge been able to add a truck and replicate the description above but... in my test I have created 4 issues, for example if three of them are changed to status Closed and one left to Undrivable I will get four icons on the page, three with Green trucks and the last one Red. So in theory it works but I obviously only want to see the last truck, one truck. I am not interested in seeing the others. <xsl:template name="dvt_1.rowview"> <xsl:variable name="CountReport" select="count(/dsQueryResponse/Rows/Row[@Highloader='GGEU12' and @Status!='Closed'])" /> <xsl:variable name="MoreThan" select="$CountReport &gt; 1" /> <xsl:variable name="NoReports" select="$CountReport = 0" /> <xsl:variable name="Closed" select=" @Highloader='GGEU12' and @Status='Closed'" /> <xsl:choose> <xsl:when test="$MoreThan"> <div class="ms-vb"><img title='More than one report exist!' border='0' alt='In Progress' src='highloader/Library/hl-orange.png' /></div> </xsl:when> <xsl:otherwise> <div class="ms-vb"><xsl:value-of disable-output-escaping="yes" select="@Icon" /></div> </xsl:otherwise> </xsl:choose> </xsl:template> My hope is that someone with slightly more knowledge can find the last piece of the puzzle for me! Thanks for reading and asking questions to fill any gap I left above. David

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  • Check if Django model field choices exists

    - by Justin Lucas
    I'm attempting to check if a value exists in the choices tuple set for a model field. For example lets say I have a Model like this: class Vote(models.Model): VOTE_TYPE = ( (1, "Up"), (-1, "Down"), ) value = models.SmallIntegerField(max_length=1, choices=VOTE_TYPES) Now lets say in a view I have a variable new_value = 'Up' that I would like to use as the value field in a new Vote. How can I first check to see if the value of that variable exists in the VOTE_TYPE tuple? Thank you.

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  • POST parameters to PHPUnit test

    - by Alejandra
    Hi Guys! I'm new on testing, I'm using PHPUnit to write test. All the site has been designed using the MVC pattern. I would like to test each method on my controllers, the problem is that such methods receives the parameters though the $_POST variable. How can I overwrite this variable? Thanks in advance Alejandra

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  • What are those little useful ,customize/enhanced php functions that you wish you knew about 2 years

    - by I Like PHP
    Hello All, i like to work in php bcoz it's just amazing language. please share basic, useful, enhanced and customize function that make things better and easy in php and must be used in our all PHP project, i m sharing some of them please share your customize function that may be useful for everyone alternative/ enhanced print_r() and var_dump() function watch( $what ) { echo '<pre>'; if ( is_array( $what ) ) { print_r ( $what ); } else { var_dump ( $what ); } echo '</pre>'; } usage: 1. watch($_POST); // to see all post variable 2. watch($array); // to see any variable may b array, string or a variable enhanced mysql_escape_string() for multidimensional array to prevent sql injection function recursive_escape(&$value) { if (is_array($value)) array_map('recursive_escape', $value); else $value = mysql_escape_string($value); } usage array_map('recursive_escape', $_POST); ---------------------For encoding Get variables-------------------------------------- function nkode($k) { if ( is_array( $k ) ) return array_map("base64_encode",$k); else return base64_encode($k); } ---------------------for decoding varaibles from GET--------------------------------- function dkode($k) { if ( is_array( $k ) ) return array_map("base64_decode",$k); else return base64_decode($k); } Usage <a href="somelink.php?pid=<?php echo nkode($someid)?>"> and on next page(somelink.php) $findID=dkode($_GET[pid]); date convert to mm/dd/yyyy to yyyy-mm-dd( if we use date datatype in mysql) and also change into mm/dd/yyyy to disply on page function dateconvert($date,$func) { if ($func == 1){ //insert conversion list($month, $day, $year) = split('[/.-]', $date); $date = "$year-$month-$day"; return $date; } if ($func == 2){ //output conversion list($year, $month, $day) = split('[-.]', $date); $date = "$month/$day/$year"; return $date; } } usage $firstDate=dateconvert($_POST['firstdate'],1); // for insertion in database $showDate=dateconvert($fetch->date_field,2) // to display on browser to clean data before doing some action with that variable function cleanID($data) { $success=0; $data=trim($data); $data=strtolower($data); $data=strip_tags($data); return $data; } usage cleanID($_POST[username]); cleanID($_GET[pid]); please share any basic function that must be used , and please give me some suggestion to make above function more better Thanks

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  • Pass variables to current tab via chrome extension

    - by iamthejeff
    I am writing my first chrome extension, and I want to pass a variable to the currently opened tab and manipulate the DOM with it. My extension has a button, and when clicked, is executing this code: chrome.tabs.getSelected(null, function(tab) { chrome.tabs.executeScript(tab.id, { file: 'tabscript.js' }); }); This works fine, but I see no way to pass a variable to tabscript.js so it can be used on the opened tab.

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  • Active User Tracking, PHP Sessions

    - by Nik
    Alright, I'm trying to work on a function for active user counting in an AJAX based application. I want to express the below SQL Query in correct syntax but I'm not sure how to write it. The desired SQL Query is below: SELECT count(*) FROM active WHERE timestamp > time() - 1800 AND nick=(a string that doesn't contain [AFK]) Now, I do understand that time() - 1800 can be assigned to a variable, but how is timestamp > variable and nick that doesn't contain a string written in SQL?

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  • What is the meaning of the following?

    - by vj
    int sampleArray[] = {1,2,3,4,5}; I understand that the sampleArray now points to the first element of the array. However, what does it mean when I say &sampleArray ? Does it mean I am getting the address of the sampleArray variable? Or does it mean a two dimensional array variable? So, i can do this: int (*p)[5] = &sampleArray? Thanks

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  • Loading a page into memory in Rails

    - by titaniumdecoy
    My rails app produces XML when I load /reports/generate_report.xml. On a separate page, I want to read this XML into a variable and save it to the database. How can I do this? Can I somehow stream the response from the /reports/generate_report.xml URI into a variable? Or is there a better way to do it since the XML is produced by the same web app?

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  • How do I change Windows Service environment path

    - by rs
    I need to change thw environment variable Environment.GetEnvironmentVariable("TMP") for a Windows service in .NET 2.0 that is running with its own user account. The server is a Windows Server 2003, SP2. Can anybody tell me how to change the Windows environment variable for that user?

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