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  • C++ - colon after contstructer, what does it mean?

    - by waitinforatrain
    Hi, I'd happily google this but don't know what to call it to google it. I have a piece of code here: class demo { private: unsigned char len, *dat; public: demo(unsigned char le = 5, unsigned char default) : len(le) { dat = new char[len]; for (int i = 0; i <= le; i++) dat[i] = default; } void ~demo(void) { delete [] *dat; } }; class newdemo : public demo { private: int *dat1; public: newdemo(void) : demo(0, 0) { *dat1 = 0; return 0; } }; (It's from a past exam paper and the question is to correct errors in the code so ignore errors!) My question is, what are the ": len(le) " and " : demo(0, 0)" called? Something to do with inheritence?

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  • reading a file that doesn't exist

    - by John
    Hi, I have got a small program that prints the contents of files using the system call - read. unsigned char buffer[8]; size_t offset=0; size_t bytes_read; int i; int fd = open(argv[1], O_RDONLY); do{ bytes_read = read(fd, buffer, sizeof(buffer)); printf("0x%06x : ", offset); for(i=0; i<bytes_read; ++i) { printf("%c ", buffer[i]); } printf("\n"); offset = offset + bytes_read; }while(bytes_read == sizeof(buffer)); Now while running I give a file name that doesn't exist. It prints some kind of data mixed with environment variables and a segmentation fault at the end. How is this possible? What is the program printing? Thanks, John

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  • How do I clear the contents of a file using c?

    - by Eddy
    I'm writing some code so that at each iteration of a for loop it runs a functions which writes data into a file, like this: int main() { int i; /* Write data to file 100 times */ for(i = 0; i < 100; i++) writedata(); return 0; } void writedata() { /* Create file for displaying output */ FILE *data; data = fopen("output.dat", "a"); /* do other stuff */ ... } How do I get it so that when I run the program it will delete the file contents at the beginning of the program, but after that it will append data to the file? I know that using the "w" identifier in fopen() will open a new file that's empty, but I want to be able to 'append' data to the file each time it goes through the 'writedata()' function, hence the use of the "a" identifier.

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  • Gson serialization depending on field value

    - by Serj Lotutovici
    I have a POJO that is similar to: public class MyGsonPojo { @Expose @SerializedName("value1") private String valueOne; @Expose @SerializedName("value2") private boolean valueTwo; @Expose @SerializedName("value3") private int valueThree; // Getters and other stuff here } The issue is that this object has to be serialized into a json body for a call to the server. Some fields are optional for the request and if I even send it with default and null values, the API responds differently (Unfortunately changing the api is not an option). So basically I need to exclude fields from serialization if any of them is set to a default value. For example if the field valueOne is null the resulting json should be: { "value2" : true, "value3" : 2 } Any idea how to make this a painless effort? I wouldn't want to build the json body manually. Any help would be great. Thank you in advice.

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  • xUnit false positive when comparing null terminated strings

    - by mr.b
    I've come across odd behavior when comparing strings. First assert passes, but I don't think it should.. Second assert fails, as expected... [Fact] public void StringTest() { string testString_1 = "My name is Erl. I am a program\0"; string testString_2 = "My name is Erl. I am a program"; Assert.Equal<string>(testString_1, testString_2); Assert.True(testString_1.Equals(testString_2)); } Any ideas?

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  • Groovy: Sorting Columns in a view: list

    - by Luixv
    I have a Groovy application. I am rendering the view list using the following statement: render (view: 'list', model:[reportingInstanceList: reportingInstanceList, reportingInstanceTotal: i, params: params]) The list.gsp is as follows: The view is rendered but the default sorting is not working. <g:sortableColumn class="tabtitle" property="id" title="Id" titleKey="reporting.id" /> <g:sortableColumn class="tabtitle" property="company" title="Company" titleKey="reporting.company" /> Unfortunately the default sorting (by id, by company, etc) are not working. Any hint why? Thanks a lot in advance. Luis

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  • Problem with connectionstring and entityframework

    - by Masna
    Hello, I have a database (sql 2008 mdf file), a class library project with an edmx file, created with the wizard. So the connection string is also made by the wizard. This project is on a teamfoundation server. I can use all the wizard made objects when coding. But when i run the program and I try to make an entityContainerName, the program crashes and gives this error: The specified named connection is either not found in the configuration, not intended to be used with the EntityClient provider, or not valid. on this line: public TestEntities() : base("name=TestEntities", "TestEntities") How can I solve this problem or what am I doing wrong?

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  • usage of 2 charectors in single qoutes in c

    - by user1632141
    #include<stdio.h> int main() { char ch = 'A'; printf("%d\n",'ag'); printf("%d\n",'a'); printf("%d, %d, %d, %d", sizeof(ch), sizeof('a'), sizeof('Ag'), sizeof(3.14f)); return 0; } I used to have many doubts on the output of this question while running on g++ and gcc. But I have cleared almost all the doubts by referring these links: Single and double quotes in C/C++ Single quotes vs. double quotes in C I still need to understand one thing about the output of this question. Can someone please explain the output of printf("%d\n",'ag'); mentioned above in the program. How is it actually stored in the memory? The output for the program on the Linux/GCC platform is: 24935 97 1, 4, 4, 4

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  • Getting NoClassDefFoundError only with TestCases

    - by Teja
    I have one class, that creates excel sheet.For that I added poi-3.2.jar to classpath. I am working with Eclipse3.7. I have generated testcases by recording workbench actions using with WindowTester Pro. I edited generated testcase and tried to create excel sheet within that to write test result. If I use same API from normal java program (within that plugin itself), it can able to create excel file without errors. But, when I try to create from testcase, I am getting the following error: java.lang.NoClassDefFoundError: org/apache/poi/hssf/usermodel/HSSFWorkbook I have added required jar file into lib folder and added to build-path. Why its working from normal java program, but not working from WindowTester generated testcase. Could anyone help me.

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  • How to generate a line break in Django template

    - by Iamamac
    I want to give default value to a textarea. The code is something like this: <textarea>{{userSetting.list | join:"NEWLINE"}}</textarea> where userSetting.list is a string list, each item of whom is expected to show in one line. textarea takes the content between the tags as the default value, preserving its line breaks and not interpreting any HTML tags (which means <br>,\n won't work). I have found a solution: {{userSetting.list | join:" " | wordwrap:0}} (there is no whitespace in the list). But obviously it is NOT a good one. Any help would be appreciated.

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  • Are there some good and modern alternatives to Javadoc?

    - by ivan_ivanovich_ivanoff
    Let's face it: You don't need to be a designer to see that default Javadoc looks ugly. There are some resources on the web which offer re-styled Javadoc. But the default behaviour represents the product and should be as reasonably good-looking. Another problem is the fact that the usability of Javadoc is not up-to-date compared to other similar resources. Especially huge projects are hard to navigate using Firefox's quick search. Practical question: Are there any standalone (desktop) applications which are able to browse existing Javadoc in a more usable way than a browser would? I'm thinking about something like Mono's documentation browser. Theoretical question: Does anyone know, if there some plans to evolve Javadoc, in a somehow-standardized way? EDIT: A useful link to Sun' wiki on this topic.

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  • How to write Cyrillic text in C++ console?

    - by VextoR
    For example, if I write: cout << "??????!" << endl; //it's hello in Russian in console it would be something like "-?????!" ok, I know that we can use: setlocale(LC_ALL, "Russian"); but after that not working command line arguments in russian (if I start my program through BAT file): StartProgram.bat chcp 1251 MyProgram.exe -user=???? -password=?????? so, after setlocale program can't read russian arguments properly. This happens because BAT file in CP1251, but console is in CP866 So, there is a question: How to write in C++ console russian text and same time russian command line arguments have to be read properly thanks

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  • static, define, and const in C

    - by yCalleecharan
    Hi, I've read that static variables are used inside function when one doesn't want the variable value to change/initialize each time the function is called. But what about defining a variable static in the main program before "main" e.g. #include <stdio.h> static double m = 30000; int main(void) { value = m * 2 + 3; } Here the variable m has a constant value that won't get modified later in the main program. In the same line of thought what difference does it make to have these instead of using the static definition: const double m = 30000; or #define m 30000 //m or M and then making sure here to use double operations in the main code so as to convert m to the right data type. Thanks a lot...

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  • Lambda expressions and nullable types

    - by Mathew
    I have two samples of code. One works and returns the correct result, one throws a null reference exception. What's the difference? I know there's some magic happening with capturing variables for the lambda expression but I don't understand what's going on behind the scenes here. int? x = null; bool isXNull = !x.HasValue; // this works var result = from p in data.Program where (isXNull) select p; return result.Tolist(); // this doesn't var result2 = from p in data.Program where (!x.HasValue) select p; return result2.ToList();

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  • how to give language option at installation time of my .net project?

    - by Ashwin
    I created one desktop project in c#. i want to know about how it could be use for different languages. i created resx file for all the forms like that: select particular form goes to the property window set localiztion true select language in which i want to show in particular language. convert all labels text and other functionality in selected language and build it. after building one another resx file created other than default resx. This process is did for all the form. so now each form having to resx file first is hi.resx for hindi and another is default resx. now my qus is that : how to give language selection option at installation time. and when user choose any language then my application is converted in that language that means particular language resx file set life time whenever user uninstall that application.

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  • how do i use htaccess to make http requests work properly

    - by Gabriel
    I currently have css and javascript file calls (amongst other things) like the following: href="/css/default.css" src="/js/ui_control.js" putting the preceding / in to make the files relative to the root. This works great when my page is in the root of the domain. However, I'm currently in the middle of transferring my site to a new hosting provider and as such have a temporary URL which is: HOST-IP/~username As such, all file calls are trying to be called from HOST-IP/css/default.css etc instead of within the ~username sub-folder. Of course I can wait until the domain name servers propagate but that's beside the point. How would I go about writing a rule in the .htaccess file that would redirect all file calls that start with a /, from going to HOST-IP/FILE-CALL, and instead to go to HOST-IP/~USERNAME/FILE-CALL. ? Any ideas?

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  • jQuery function in .click() etc

    - by Martind
    Hi all. So normally, I do it like this: $('#selectRoom a').click( function(e) { e.preventDefault(); // To prevent the default behavior (following the link or adding # to URL) // Do some function specific logic here }); However, I would like to do it like this, to clean things up (and be able to reuse): $('#selectRoom a').click( selectRoom ); function selectRoom () { e.preventDefault(); // To prevent the default behavior (following the link or adding # to URL) // Do some function specific logic here } The problem is, i cant pass the "e" event-handler to the function, then the selectRoom() function is called on load. i.e: $('#selectRoom a').click( selectRoom(e) ); Can I fix this somehow?

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  • wpf datagrid on click event

    - by gencay
    I use datagrid table on my project. One of the column of the datagrid is the path of the document according to my project. I would like to do that: When the user clicks the path cell/hyperlink cell, Program will get the path, Program will open another tab. I couldn't see the onclick event for the column, how can i do this? And also how can I switch the tabitems on the same wpf Window? Hyper link column is that: < toolkit:DataGridHyperlinkColumn Header="Path" Binding="{Binding path}" IsReadOnly="True" TargetName="{Binding Path=path}"

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  • Exclusive compute mode with OpenCL+NVidia

    - by lokli
    Hi, I have a question to exclusive compute mode with NVidia+OpenCL. I can set up exclusive compute mode (page 74 from cuda programming guide 3.0) with nvidia-smi on a nvidia-gpu . that means, only one program can compute on gpu. cuda runtime schedules than app automatically. but I have a problem with opencl-programs in this case: if one application runs on a gpu with setted exclusive compute mode and second opencl-program calls clGetDeviceInfo(..., CL_DEVICE_AVAILABLE, ...) with the same GPU is the result == CL_TRUE. After that if opencl-app tries to create a context on this device, than crashes the running app (both). How can i find out an available GPU with OpenCL? Thanks.

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