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• How to understand the programming of an operating system

  - by piemesons

  Hello, I want to learn the operating system. How it works. I don't want to make my own operating system. I just want to learn how it works. As I can find out source code of any open source OS. But how to start. Like starting from the first elementary kernel (whatever it is). Somebody suggested I try to implement Linux from scratch etc. Please guide me in a proper way. I want to know about the proper path to follow. I am ready to invest three to four years just to understand the basics. I have good fundamentals of C, C++, PHP, OOP and compiler design.

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• How to give user confirmation message before ActionLink based on validation

  - by RememberME

  I have the following link. On click, I'd like to check the item.primary_company field and if populated, give the user a warning and ask if they would like to continue. How can I do this? <a href="<%= Url.Action("Activate", new {id = item.company_id}) %>" class="fg=button fg-button-icon-solo ui-state-default ui-corner-all"><span class="ui-icon ui-icon-refresh"></span></a> EDIT I've changed to this, but nothing happens when clicked. Also, I don't know how to reference the item to do the check on the primary_company field. I only want to message to show if item.primary_company.HasValue. I'd also like to show item.company1.company_name in the confirm message. <a href="#" onclick="return Actionclick("<%= Url.Action("Activate", new {id = item.company_id}) %>");" class="fg=button fg-button-icon-solo ui-state-default ui-corner-all"><span class="ui-icon ui-icon-refresh"></span></a> <script type="text/javascript"> function Actionclick(url) { alert("myclick"); if ( confirm("Do you want to activate this company's primary company and all other subsidiaries?")) { location.href(url); } }; </script>

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• Changing a project's files based on solution in Visual Studio 2008

  - by emddudley

  In one C# solution I have several projects that share a CommonAssemblyInfo.cs file, so that certain assembly attributes are shared across all projects. This works fine so long as I only have one CommonAssemblyInfo.cs file. However I have several solutions (applications) which use these projects, and each solution has its own version of CommonAssemblyInfo.cs. How can I make the projects use a different CommonAssemblyInfo.cs file depending on which solution they are in? In the end I want my assemblies to have attributes specific to the solution they were compiled from. I don't think I can make them files Solution files because they can't all be in the same directory with the same filename. I can't use pre-build events because I don't have a particular project which is always built first. I would prefer not to use a build script because I would like to be able to build and run the solutions through the Visual Studio environment.

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• JQuery conflict with body onload event.

  - by Evgeny

  Strange conflict in my code. I have function that called from body onload: var someGlobalVar=new SpecialType(); function OnBodyLoad() { someGlobalVar.Bind(); } but when i include JQuery 1.4.2 to my project i have error that someGlobalVar is undefined. Why global variable now is undefined and what ways to fix it?

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• Why do people run Java GUI's on the Event Queue

  - by asmo

  In Java, to create and show a new JFrame, I simply do this: public static void main(String[] args) { new JFrame().setVisible(true); } However, I have seen many people doing it like this: public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { new JFrame().setVisible(true); } }); } Why? Are there any advantages?

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• Django populate select field based on model query

  - by Mike

  I have the following model class DNS(models.Model): domain = models.ForeignKey(Domain) host_start = models.CharField(max_length=150, blank=True, null=True) type = models.SmallIntegerField(max_length=1, default=0, choices=DNS_CHOICE) value = models.SmallIntegerField(max_length=3, default=0, blank=True, null=True) ip = models.IPAddressField(blank=True, null=True) host_end = models.ForeignKey("DNS", blank=True, null=True) other_end = HostnameField(max_length=150, blank=True, null=True) created = models.DateTimeField(auto_now_add=True) sticky = models.BooleanField(default=0) other = models.BooleanField(default=0) When I try to init a form with just foreignkeys on host_end.. it always shows all entries in the DNS table domain = Domain.objects.get(id=request.GET['domain'], user=request.user, active=1) form = DNSFormCNAME(initial={'ip': settings.MAIN_IP, 'type': request.GET['type'], 'host_end': DNS.objects.filter(domain=domain)}) I just want the zones that match that domain.. not all domains.

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• PHP Extract Values From One String Based on a Pattern Defined in Another

  - by ironkeith

  I have two strings: $first = '/this/is/a/string'; $second = '/this/:param1/a/:param2'; And I'm trying to get this: $params = array('param1' => 'is', 'param2' => 'string'); But getting from point a to b is proving more than my tired brain can handle at the moment. Anything starting with a ':' in the second string defines a variable name/position. There can be any number of variables in $second which need to be extracted from $first. Segments are separated by a '/'. Thanks.

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• solution for updating table based on data from another table

  - by I__

  i have 2 tables in access this is what i need: 1. if the PK from table1 exists in table2, then delete the entire record with that PK from table2 and add the entire record from table1 into table2 2. if the PK does not exist then add the record i need help with both the sql statement and the VBA i guess the VBA should be a loop, going through every record in table1. inside the loop i should have the select statement

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• Portable Socket programming in C/C++ possible?

  - by questions

  I am thinking of creating a multi-platform portable C++ server-client application. Is it even possible while using only standard libraries? If no, what other libraries are there? Are there any improvements in this direction in C++11x? Like for threads, now we have std::threads. To make it more clear.. I want something like boost::thread, which provides multiplatform portable multithreading, for networking. And why C++ doesn't have libraries(standard) for such basic things like networking?

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• Identifying when there is more than 1 in a group based on grouped field

  - by Brian Cascone

  Sorry for the bad description it is tough to explain in one sentence. I have a dataset that has Cause field (RootCause) and an ID field (GroupID). Both can be many things but I need to identify where a GroupID has a multiple different rootcauses. for example: RootCause GrpId AAA 111 BBB 222 CCC 111 I am looking to be able to identify that GrpId 111 has two different RootCauses. This is what I have so far: Select [RootCause], GrpId, Count(GrpID) as CntGrpId From DB.dbo.Table Where DatatypeField <> '' Group BY [RootCause],GrpId This results set visualy gives me enough information to identify what I am looking for, but i need something better. I am looking to return only the ones that have multiples. Any ideas? Thanks

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• Javascript function programming — receiving elaborate parameters

  - by Barney

  I'm writing a Javascript function that would manipulate an array written on-the-fly and sent as a parameter. The function is written as follows: function returnJourney(animation,clean){ var properties = {}; // loads of other inane stuff for(i in animation[0]) properties[animation[0][i]] = animation[0].i; // heaps more inane stuff } The animation in question is a set of parameters for a jQuery animation. Typically it takes the format of ({key:value,key:value},speedAsInteger,modifierAsString). So to kick off initial debugging I call it with: returnJouney(({'foo':'bar'},3000),1); And straight off the bat things are way off. As far as I see it this would have returnJourney acknowledge clean === 1, and animation being an array with an object as its first child and the number 3000 as its second. Firebug tells me animation evaluates as the number 3000. What am I doing wrong?

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• Place text based divs in relative locations within a circle

  - by NickG

  Direct question - How would I place certain objects or small text within a certain area. For example, how would I replace the following image with html/javascript. --- I don't have enough reps to post an image :/ but try this URL - http://i.imgur.com/a3eWL.jpg Big picture - I am trying to create a kml file for Google Earth that when the point is clicked, the balloon description window pops up and I can display my html formatted diagram showing where the satellites are at that instant. Google Earth and KML docs allow for pretty much any html formatting within it, so currently looking for a good way to do this. Disclaimer: It has been a few years since i have done any html or javascript editing, so general examples and insight is greatful. Thanks

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• Windows based development for ARM processors

  - by user367231

  I am a complete newbie to the ARM world. I need to be able to write C code, compile it, and then download into an ARM emulator, and execute. I need to use the GCC 4.1.2 compiler for the C code compilation. Can anybody point me in the correct directions for the following issues? What tool chain to use? What emulator to use? Are there tutorials or guides on setting up the tool chain?

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• Print the first line of a file C programming

  - by Pedro

  void cabclh(){ FILE *fp; char *val, aux; int i=0; char *result, cabeca[60]; fp=fopen("trabalho.txt","r"); if(fp==NULL){ printf("ERROR\n"); return ; } val=(char*)calloc(aux, sizeof(char)); while(fp='\n'){ fgets(cabeca,60,fp); printf("%s\n",cabeca); } fclose(fp); free(fp); } I want to open a file and print the first line. the problem here is in while(fp='\n'), what i'm doing wrong. How can i make a function that recognize the first char from a file... like: FILE *arq; char info[20]; arq=fopen("trabalho.txt","r"); if(fp==NULL){ printf("ERROR\n"); return ; } if(fp[0]='-'){ //check if the first element is a '-' printf("It's info\n"); }

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• Execution sequence inside a jquery event handler

  - by user576358

  I have a big issue with the execution squence inside this jquery handler : Was wondering if anyone has come accross this before: I have a simple form: <form action='foo.cgi' id='myForm' > <input type=text name='name' /> <input type=submit value='Find it!'/> </form> when user clicks on Find it! would like to change the cursor to 'progress' before the data is returned through an ajax call: $(document).ready(function(){ $("#myForm ").submit(function(){ $("body").css("cursor", "progress") ; htmlobj=$.ajax({url:server_url,..........); } } However: The cursor [line 2 above ] does not change until data is returned through ajax - Seems like line 3. gets executed before 2. Any help is greatly appreciated

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• Adding an additional click event to every element (JavaScript / jQuery)

  - by Gausie

  I'm developing a touchscreen application that, aside from everything else, records the amount of times the screen is used so that the user can be reminded to clean the screen after a predefined number of clicks. I've got the click functions written nicely, all I need now is make sure the function is called on a click. I imagine $('*').click(function() { //do something }); would accomplish my goal, but is that the best way? Also, would that overwrite other click functions assigned to the elements?

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• Registry based components with Inno Setup

  - by cyxou

  Hello guys! I'm creating an application for my company. And the goal is to create a universal installer that will be checking user's registry for specific apps installed and according to these apps would create a list of available installation components in "Select Components" window. And that's the particular problem I'm stacked with. I've already created the installer, but a user have to check/uncheck components he doesn't need because he doesn't use specific app. That is definitely not a good way of doing thing I guess... So I'm asking for help, please. Could this be implemented through "Select Components" window and how or I should create custom wizard page with checkboxes (again - How)? Many thx in advance.

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• casting issue with realpath function (c programming)

  - by Ralph

  When I compile the following code: #define _POSIX_C_SOURCE 200112L #define _ISOC99_SOURCE #define __EXTENSIONS__ #include <stdio.h> #include <limits.h> #include <stdlib.h> int main(int argc, char *argv[]) { char *symlinkpath = argv[1]; char actualpath [PATH_MAX]; char *ptr; ptr = realpath(symlinkpath, actualpath); printf("%s\n", ptr); } I get a warning on the line that contains the call to the realpath function, saying: warning: assignment makes pointer from integer without a cast Anybody know what's up? I'm running Ubuntu Linux 9.04

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• How to make a simple Wine-based installer for Windows application

  - by zarawesome

  My Windows application runs under Wine, but the installation is a bit of a headache for laymen, and the wrappers I've seen online (PlayOnLinux, Wine Doors) require even more packages to be installed. Is there a way to make a package that will install Wine if the user needs it to be installed, install the application and shortcuts, all with minimal user hassle?

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• Are RDF triple Stores, suitable for everyday programming?

  - by WeNeedAnswers

  I like these a lot, and would like to use them for everything. Why shouldn't I?

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• Fire Box doesnot support program based calling function

  - by manish

  on clicking any row of the following program... i am firinf on function mail file click....function just having alert message that shoes deffrent file name on the bases of clicking... *its working properly in IE .....FireBox N other browser function doesnot call on clicking on any row.. whats problem..please help me......i am writing code for your better awareness* For Each info In fsi Response.Write("<span id=" & " 'userijd'" & " onmouseup=" & "mailfileclick('" & info.Name & "')" & ";>") Response.Write("<td width=" & "16%" & " bgcolor=" & "#FFFFFF" & " style=" & "border-bottom-style:&nbsp;solid;&nbsp;border-bottom-width:&nbsp;1px" & " bordercolor=" & "#C0C0C0" & " nowrap" & ">") Response.Write("<font face=" & "Arial" & "style=" & "font-size:&nbsp;9pt" & " color=" & "#000000" & ">" & Mid(contents, InStr(contents, "Date: ") + Len("Date:"), 17) & "</font></td>") Response.Write("</span>") Next

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• .NET Based Radio Automation

  - by Brent Pabst

  I'm curious if anyone has seen an Open Source radio automation package (I found one in Russian on CodePlex) built on .NET In addition if I wanted to build something like this in a client server environment is WCF and WPF the best way to do it? Is it fast enough to trigger songs to play/encode on the server from a remote WPF client? Sort of vague questions but I wanted to get some community feedback.

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• Are Triggers Based On Queries Atomic?

  - by David

  I have a table that has a Sequence number. This sequence number will change and referencing the auto number will not work. I fear that the values of the trigger will collide. If two transactions read at the same time. I have ran simulated tests on 3 connections @ ~1 million records each and no collisions. CREATE TABLE `aut` ( `au_id` int(10) NOT NULL AUTO_INCREMENT, `au_control` int(10) DEFAULT NULL, `au_name` varchar(50) DEFAULT NULL, `did` int(10) DEFAULT NULL, PRIMARY KEY (`au_id`), KEY `Did` (`did`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=latin1 TRIGGER `binc_control` BEFORE INSERT ON `aut` FOR EACH ROW BEGIN SET NEW.AU_CONTROL = (SELECT COUNT(*)+1 FROM aut WHERE did = NEW.did); END;

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• How to make sure input is a double in the C programming language

  - by Chris_45

  How do I make sure I've got a double and not something else? int main() { int flagOk = 0; double number; while(!flagOk) { printf("Put in a double"); scanf("%lf", &number); if(number == "%lf"); //this want make sure flagOk = 1; } }

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• Event handling C# / Registering a callback

  - by Jeff Dahmer

  Events can only return void and recieve object sender/eventargs right? If so then craptastic.... how can I pass a function pointer to another obj, like: public bool ACallBackFunc(int n) { return n > 0; } public void RegisterCallback(Something s) { s.GiveCallBack(this.ACallBackFunc); } Something::GiveCallBack(Action? funcPtr) I tried using Action, but I need it to return some value and Actions can only return void. Also, we do not know what kind of a callback we will be recieving; it could return anything and have any params! Reflection will have to be used somehow I reckon.

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