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  • Passing C string reference to C#

    - by user336109
    c code extern "C" __declspec(dllexport) int export(LPCTSTR inputFile, string &msg) { msg = "haha" } c# code [DllImport("libXmlEncDll.dll")] public static extern int XmlDecrypt(StringBuilder inputFile, ref Stringbuilder newMsg) } I got an error when I try to retrieve the content of newMsg saying that I'm trying to write to a protected memory area. What is the best way to retrieve the string from c to c#. Thanks.

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  • Dependency Injection: How to pass DB around?

    - by Stephane
    Edit: This is a conceptual question first and foremost. I can make applications work without knowing this, but I'm trying to learn the concept. I've seen lots of videos with related classes and that makes sense, but when it comes to classes wrapping around other classes, I can't seem to grasp where things should be instantiated/passed around. =-=-=-=-=-=-= Question: Let's say I have a simple page that loads data from a table, manipulates the result and displays it. Simple. I'm going to use '=' for instantiating a class and '-' for passing a class in using constructor injection. It seems to me that the database has to be passed from one end of the application to the other which doesn't seem right. Here's how I would do it if I wanted to separate concerns: index =>Controller =>Model Layer =>Database =>DAO->Database I have this rule in my head that says I'm not supposed to create objects inside other objects. So what do I do with the Database? Or even the Model for that matter? I'm obviously missing something so basic about this. I would love a simplified example so that I can move forward in my code. I feel really hamstrung by this.

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  • C++, is it possible to obtain the dimension of an array?

    - by aaa
    hi. Suppose I have some pointer, which I want to reinterpret as static dimension array reference: double *p; double (&r)[4] = ?(p); // some construct? // clarify template< size_t N> void function(double (&a)[N]); ... double *p; function(p); // this will not work. // I would like to cast p as to make it appear as double[N] Is it possible to do so? how do I do it?

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  • Pointer-like behavior in Java

    - by Shmoo
    I got the following: class A{ int foo; } class B extends A{ public void bar(); } I got a instance of A and want to convert it to an instance of B without losing the reference to the variable foo. For example: A a = new A(); a.foo = 2; B b = a; <-- what I want to do. //use b b.foo = 3; //a.foo should now be 3 Thanks for any help!

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  • Prevent debugging projects that are added as reference in Visual Studio

    - by DSWD
    I have a project that is auto generated. This project is referenced by my web app in visual studio. When i step through the code in debug mode the code from this project gets stepped into. Is there a way I can skip this code in debug mode. I can't use System.Diagnostics.DebuggerStepThroughAttribute since the code will get replaced every time my datasource changes. Thanks,

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  • int vs const int&

    - by Valdo
    I've noticed that I usually use constant references as return values or arguments. I think the reason is that it works almost the same as using non-reference in the code. But it definitely takes more space and function declarations become longer. I'm OK with such code but I think some people my find it a bad programming style. What do you think? Is it worth writing const int& over int? I think it's optimized by the compiler anyway, so maybe I'm just wasting my time coding it, a?

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  • Postion of & to denote reference type

    - by Matt H
    I was wondering whether to put the ampersand (&) after the variable type or before the variable name. To put it simply, I want to know which one is the conventional style or the standard, or if it is entirely down to preference. int &x; or int& x;

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  • Pass variables between separate instances of ruby (without writing to a text file or database)

    - by boulder_ruby
    Lets say I'm running a long worker-script in one of several open interactive rails consoles. The script is updating columns in a very, very, very large table of records. I've muted the ActiveRecord logger to speed up the process, and instruct the script to output some record of progress so I know how roughly how long the process is going to take. That is what I am currently doing and it would look something like this: ModelName.all.each_with_index do |r, i| puts i if i % 250 ...runs some process... r.save end Sometimes its two nested arrays running, such that there would be multiple iterators and other things running all at once. Is there a way that I could do something like this and access that variable from a separate rails console? (such that the variable would be overwritten every time the process is run without much slowdown) records = ModelName.all $total = records.count records.each_with_index do |r, i| $i = i ...runs some process... r.save end meanwhile mid-process in other console puts "#{($i/$total * 100).round(2)}% complete" #=> 67.43% complete I know passing global variables from one separate instance of ruby to the next doesn't work. I also just tried this to no effect as well unix console 1 $X=5 echo {$X} #=> 5 unix console 2 echo {$X} #=> "" Lastly, I also know using global variables like this is a major software design pattern no-no. I think that's reasonable, but I'd still like to know how to break that rule if I'd like. Writing to a text file obviously would work. So would writing to a separate database table or something. That's not a bad idea. But the really cool trick would be sharing a variable between two instances without writing to a text file or database column. What would this be called anyway? Tunneling? I don't quite know how to tag this question. Maybe bad-idea is one of them. But honestly design-patterns isn't what this question is about.

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  • can function return 0 as reference

    - by helloWorld
    I have this snippet of the code Account& Company::findAccount(int id){ for(list<Account>::const_iterator i = listOfAccounts.begin(); i != listOfAccounts.end(); ++i){ if(i->nID == id){ return *i; } } return 0; } Is this right way to return 0 if I didn't find appropriate account? cause I receive an error: no match for 'operator!' in '!((Company*)this)->Company::findAccount(id)' I use it this way: if(!(findAccount(id))){ throw "hey"; } thanks in advance

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  • Do i need a hashtag in Javascript to pass as a Div

    - by Mike
    How do i insert this php DivSomething into Javascript? Since Javascript needs a hashtag to recognize that as a div. Is there a way to tell JS that this is a Div or there's other better way to do it? Any help would be very much appreciated. <script> /*How do i insert a var DivSomething into JS with a hashtag */ /* DivSomething is php dynamic. It returns a Div. It can be #Div1, #Div2, #Div3... */ var DivSomething = '<?php echo $Highlight; ?>' $(function() { $('#MouseHere').hover(function() { $('#' + DivSomething).css('background-color', '#ffffff'); }, function() { // on mouseout, reset the background colour $('#' + DivSomething).css('background-color', ''); </script>

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  • Can typeid() be used to pass a function?

    - by Kerb_z
    I tried this and got the output as: void Please explain the following Code: #include <cstdio> #include <typeinfo> using namespace std ; void foo() { } int main(void) { printf("%s", typeid(foo()).name());// Please notice this line, is it same as typeid( ).name() ? return 0; } AFAIK: The typeid operator allows the type of an object to be determined at run time. So, does this sample code tell us that a function that returns void is of *type void*. I mean a function is a method and has no type. Correct?

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  • Python 3.2: How to pass a dictionary into str.format()

    - by Robert Dailey
    I've been reading the Python 3.2 docs about string formatting but it hasn't really helped me with this particular problem. Here is what I'm trying to do: stats = { 'copied': 5, 'skipped': 14 } print( 'Copied: {copied}, Skipped: {skipped}'.format( stats ) ) The above code will not work because the format() call is not reading the dictionary values and using those in place of my format placeholders. How can I modify my code to work with my dictionary?

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  • Pass/Access Object Attributes to/from another Class

    - by Namuna
    Issue: Unable to access parent object attributes Verification.pm: (Parent class) package Verification; use Verification::Proid; sub Proid { my $self = shift; print Dumper($self); my $result = Verification::Proid->validate($self); return $result; } Dumper result $VAR1 = bless( { 'event_name' => 'validate', 'Verification_Type' => 'Proid', 'Verification_Value' => 'ecmetric', 'xml_request' => bless( do{\(my $o = 148410616)}, 'XML::LibXML::Document' ), 'Verification_Options' => [ { '2' => 'UNIX' } ], 'Verification_ID' => '3' }, 'Verification' ); Proid.pm: (Child class) package Verification::Proid; our @ISA = qw(Verification); sub validate { my $self = shift; print Dumper($self); my $result; foreach my $validation_type ( @$self->{Verification_Options} ) { do stuff... } } Dumper result $VAR1 = 'Verification::Proid'; What am I doing wrong that the child class isn't properly getting all the attributes from the object passed to it? Thank you!

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  • Pass database data to multiples views-Laravel

    - by user3696018
    I have a database with details of daily sales. To query a database, I have a form in a view with parameters that will query as date of admission, client and others. The result is shown in another view with the daily details of income, and below is a summary of the article do all entered. The summary I wish to transfer to another view, try to view :: composer but only transfer the empty query (I saw it with debug bar). Just appeared an empty view. How I can transfer data from the database without the latter view is empty? The second html view is totaly diferent , only the data is the same.

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  • Reference string as object

    - by xintron
    I've got the following function that manipulates an element according to the data being sent (an object). function manipulateElem (elem, data) { for (var key in data) { elem[key] = data[key]; }; } manipulateElem(document.getElementById('test'), {'href': '/home/', 'style.color': '#000000'}); As you can imagine, the later (style.color) doesn't work. How would one solve this the best way?

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  • PASS Location fixed for the next 2 years - Are they listening?

    - by simonsabin
    I've just received the PASS connector newsletter with details of the decision of where to locate the next summits. To me it shows you how you can spin statistics they way you want to. I am very suprised by the numbers 81% said that they would like an east coast event. The spin is that "When we look at responses from only 2008 and 2009 Summit attendees (our most successful ones by far), the number who want a future Summit outside of Seattle drops to 69%." Wow the number drops thats bad. We must stay in Seattle then. My take however is that 69% of those willing to travel to Seattle want an event NOT in Seattle. Doesn't that suggest that people would like an event not in Seattle. I appreciate the comment about the launch years however 2012 isn't going to be a launch year because they need to get SQL out of the door before then to meet the 3 year software assurance cycle. So sticking 2012 in Seattle is IMHO a bad decision. It might keep the cost down for the PASS org, Microsoft and the attendees that live near Seattle but does it keep the cost down for the rest of the SQL Community? They do mention a possibility of an event on the East Coast and I do hope that its not just lip service. Flights for me to the East coast look ~30% cheaper than to Seattle and I've never been to the East Coast. Come on PASS show you are listening to the community.

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  • What is the proper way to pass the parameters into a MVC system?

    - by gunbuster363
    I am trying to learn java servlet/jsp with the MVC concept and built the simplest MVC application. Now I want give more detail to it to enhance my understanding. If I would need to register a new row in a table in the database, how should we pass the various value of column into the system? For example, the user might want to register a new event in his planner and the detail of the event involves the 'where', 'when', 'who', 'detail', etc. Should pass all this long value from the servlet's parameter, i.e: the http link? String accNo = request.getParameter("account_number"); String a = request.getParameter("..."); String b = request.getParameter("..."); String c = request.getParameter("..."); String d = request.getParameter("..."); To illustrate my view that it is really unprofessional to show all the parameter on the link: http://localhost:8080/domain1/servlet1?param1=55555555555555&param2=666666666666666666666666666666666666666666666666666666666666&param3='Some random detail written by user.........................' Is there other way to pass them?

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  • How to reference or connect a variable to another class without stack overflow?

    - by SystemNetworks
    I really need to re-arrange all my functions. I created a class. All my var, booleans, int, doubles and other things. I created every new variable so they can reference it and so they don't have an error. If your asking why I never just reference my main class vars to my sub-class becuase it will give me stack overflow! When in my main class i link my sub-class. subClass s = new subClass(); Then I reference my fake variable to my real variable for example: This is my sub-class variable(I call it fake) public int x = 0; In my main class, I put it like this: s.x = x; The problem is, it does not work! Maybe this is not the right place but I cant ask any questions on stack overflow because they banned me. If I connect my main class and connect my sub-class it will give me stack overflow. How do I stop it?

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  • How to pass an interface to Java from Unity code?

    - by nickbadal
    First, let me say that this is my first experience with Unity, so the answer may be right under my nose. I've also posted this question on Unity's answers site, but plugin questions don't seem to be as frequently answered there. I'm trying to create a plugin that allows me to access an SDK from my game. I can call SDK methods just fine using AndroidJavaObject and I can pass data to them with no issue. But there are some SDK methods that require an interface to be passed. For example, my Java function: public void attemptLogin(String username, String password, LoginListener listener); Where listener; is a callback interface. I would normally run this code from Java as such: attemptLogin("username", "password", new LoginListener() { @Override public void onSuccess() { //Yay! do some stuff in the game } @Override public void onFailure(int error) { //Uh oh, find out what happened based on error } }); Is there a way to pass a C# interface through JNI/Unity to my attemptLogin function? Or is there a way to create a mimic-ing interface in C# that I can call from inside the Java code (and pass in any kind of parameter)? Thanks in advance! :)

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  • Which is the way to pass parameters in a drawableGameComponent in XNA 4.0?

    - by cad
    I have a small demo and I want to create a class that draws messages in screen like fps rate. I am reading a XNA book and they comment about GameComponents. I have created a class that inherits DrawableGameComponent public class ScreenMessagesComponent : Microsoft.Xna.Framework.DrawableGameComponent I override some methods like Initialize or LoadContent. But when I want to override draw I have a problem, I would like to pass some parameters to it. Overrided method does not allow me to pass parameters. public override void Draw(GameTime gameTime) { StringBuilder buffer = new StringBuilder(); buffer.AppendFormat("FPS: {0}\n", framesPerSecond); // Where get framesPerSecond from??? spriteBatch.DrawString(spriteFont, buffer.ToString(), fontPos, Color.Yellow); base.Draw(gameTime); } If I create a method with parameters, then I cannot override it and will not be automatically called: public void Draw(SpriteBatch spriteBatch, int framesPerSecond) { StringBuilder buffer = new StringBuilder(); buffer.AppendFormat("FPS: {0}\n", framesPerSecond); spriteBatch.DrawString(spriteFont, buffer.ToString(), fontPos, Color.Yellow); base.Draw(gameTime); } So my questions are: Is there a mechanism to pass parameter to a drawableGameComponent? What is the best practice? In general is a good practice to use GameComponents?

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  • unlinked libraries in a makefile?

    - by wyatt
    I'm trying to install a libspopc, but when I run the make I get the following output: cc -Wall -Wextra -pedantic -pipe -fPIC -Os -DUSE_SSL -c session.c cc -Wall -Wextra -pedantic -pipe -fPIC -Os -DUSE_SSL -c queries.c cc -Wall -Wextra -pedantic -pipe -fPIC -Os -DUSE_SSL -c parsing.c cc -Wall -Wextra -pedantic -pipe -fPIC -Os -DUSE_SSL -c format.c cc -Wall -Wextra -pedantic -pipe -fPIC -Os -DUSE_SSL -c objects.c cc -Wall -Wextra -pedantic -pipe -fPIC -Os -DUSE_SSL -c libspopc.c rm -f libspopc*.a ar r libspopc-0.9n.a session.o queries.o parsing.o format.o objects.o libspopc.o ar: creating libspopc-0.9n.a ranlib libspopc-0.9n.a ln -s libspopc-0.9n.a libspopc.a rm -f libspopc*.so cc -o libspopc-0.9n.so -shared session.o queries.o parsing.o format.o objects.o libspopc.o ln -s libspopc-0.9n.so libspopc.so cc -o poptest1 -Wall -Wextra -pedantic -pipe -fPIC -Os -DUSE_SSL examples/poptest1.c -L. -lspopc -lssl -lcrypto /usr/local/lib/libcrypto.a(dso_dlfcn.o): In function `dlfcn_globallookup': dso_dlfcn.c:(.text+0x2d): undefined reference to `dlopen' dso_dlfcn.c:(.text+0x43): undefined reference to `dlsym' dso_dlfcn.c:(.text+0x4d): undefined reference to `dlclose' /usr/local/lib/libcrypto.a(dso_dlfcn.o): In function `dlfcn_pathbyaddr': dso_dlfcn.c:(.text+0x8f): undefined reference to `dladdr' dso_dlfcn.c:(.text+0xe9): undefined reference to `dlerror' /usr/local/lib/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_func': dso_dlfcn.c:(.text+0x491): undefined reference to `dlsym' dso_dlfcn.c:(.text+0x570): undefined reference to `dlerror' /usr/local/lib/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_var': dso_dlfcn.c:(.text+0x5f1): undefined reference to `dlsym' dso_dlfcn.c:(.text+0x6d0): undefined reference to `dlerror' /usr/local/lib/libcrypto.a(dso_dlfcn.o): In function `dlfcn_unload': dso_dlfcn.c:(.text+0x735): undefined reference to `dlclose' /usr/local/lib/libcrypto.a(dso_dlfcn.o): In function `dlfcn_load': dso_dlfcn.c:(.text+0x817): undefined reference to `dlopen' dso_dlfcn.c:(.text+0x88e): undefined reference to `dlclose' dso_dlfcn.c:(.text+0x8d5): undefined reference to `dlerror' collect2: ld returned 1 exit status make: *** [poptest1] Error 1 A quick search suggested that this was due to libdl being unlinked, though this seems unlikely in a distributed library, particularly a seemingly relatively popular one. Could anything else be causing this? And if it is due to an unlinked library, how would I go about fixing it? Thanks

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