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• What interprocess locking calls should I monitor?

  - by Matt Joiner

  I'm monitoring a process with strace/ltrace in the hope to find and intercept a call that checks, and potentially activates some kind of globally shared lock. While I've dealt with and read about several forms of interprocess locking on Linux before, I'm drawing a blank on what to calls to look for. Currently my only suspect is futex() which comes up very early on in the process' execution. Update0 There is some confusion about what I'm after. I'm monitoring an existing process for calls to persistent interprocess memory or equivalent. I'd like to know what system and library calls to look for. I have no intention call these myself, so naturally futex() will come up, I'm sure many libraries will implement their locking calls in terms of this, etc. Update1 I'd like a list of function names or a link to documentation, that I should monitor at the ltrace and strace levels (and specifying which). Any other good advice about how to track and locate the global lock in mind would be great.

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• Creating many new instances vs reusing them?

  - by Hugo Riley

  I have multiple business entities in VB.NET Windows Forms application. Right now they are instanced on application startup and used when needed. They hold descriptions of business entities and methods for storing and retrieving data. To cut the long story short, they are somewhat heavy objects to construct (they have some internal dictionaries and references to other objects) created and held in one big global variable called "BLogic". Should I refactor this so that each object is created when needed and released when out of scope? Then every event on UI will probably create a few of this objects. Should I strive to minimize creation of new objects or to minimize number of static and global objects? Generally I am trying to minimize the scope of every variable but should I treat this business logic objects specially?

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• jquery form validation

  - by kalpaitch

  I am using jquery for a quick and easy form validation My forms use the input's default value as a label and I have a little onfocus and onblur javascript function to show and hide this when the user starts to type: <input name='fnameREG' type='text' id='fnameREG' value='first name' size='70' onfocus='clearInput(this)' onblur='clearInput(this)' /> <input name='lnameREG' type='text' id='lnameREG' value='last name' size='70' onfocus='clearInput(this)' onblur='clearInput(this)' /> My issue with the validation is that when the submit button is clicked the pluggin thinks that all the fields are set because they have a default value. I looked but I couldn't find a supplied method to get round this. Thanks!

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• How to pass an event to a method and then subscribe to it?

  - by Ryan Peschel

  Event Handler public void DeliverEvent(object sender, EventArgs e) { } #1: This Works public void StartListening(Button source) { source.Click += DeliverEvent; } #2: And so does this.. public void StartListening(EventHandler eventHandler) { eventHandler += DeliverEvent; } But in #2, you cannot call the method because if you try something like this: StartListening(button.Click); You get this error: The event 'System.Windows.Forms.Control.Click' can only appear on the left hand side of += or -= Is there any way around that error? I want to be able to pass the event and not the object housing the event to the StartListening method.

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• Develop an classic UI or be bold with a newer design?

  - by DeanMc

  Forgive me if this is the wrong place but I am curious as to how other programmers feel about this topic: I am currently working on my portfolio site, it is being designed and built in silverlight 4. I initially started off with a typical stylised e-folio theme much like a standard website in terms of layout and flow. As I work more in the concept stages something has struck me. Am I trying to shoe-horn yesterday into today? What I am talking about is UI expectations. I'm all for clean user interfaces but that does not mean they should not take advantage of new concepts in presentation right? If you where to develop a site in silverlight as your own portfolio piece would you stick to the tried and tested "website" feel or would you try to come up with a UI that is intuitive and complements the technology? I feel that UI discussions are all the more important now that all forms of web development are allowing better methods to engage the user.

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• Split user.config into different files for faster saving

  - by HorstWalter

  In my c# Windows Forms application (.net 3.5 / VS 2008) I have 2 settings files resulting in one user.config file. One setting file consists of larger data, but is rarely changed. The frequently changed data are very few. However, since the saving of the settings is always writing the whole (XML) file it is always "slow". SettingsSmall.Default.Save(); // slow, even if SettingsSmall consists of little data Could I configure the settings somehow to result in two files, resulting in: SettingsSmall.Default.Save(); // should be fast SettingsBig.Default.Save(); // could be slow, is seldom saved I have seen that I can use the SecionInformation class for further customizing, however what would be the easiest approach for me? Is this possible by just changing the app.config (config.sections)?

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• Can 'locals' be used with 'collection' when rendering partials in Rails?

  - by Gav

  Everything works okay when I try to render a partial like this: = render :partial => "/shared/enquiry/car_type", :collection => @enquiry.available_car_types However, if I also want to pass a variable (in this case 'path', because I'm sharing this partial across two forms), the path is not available to me: = render :partial => "/shared/enquiry/car_type", :collection => @enquiry.available_car_types, :locals => {:path => customers_enquiry_path} I've tried moving things around, but nothing appears to work, leading me to believe one cannot use locals with collections. Any help would be appreciated. Gav

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• How to make a Non Rectangular Winforms ?

  - by karthik

  I am using the below code to change to shape of the winform. Its changing the shape, but not like how i wanted. I need the forms to have curved corners. What points should i use to get it ? public void MakeNonRectangularForm() { System.Drawing.Drawing2D.GraphicsPath p = new System.Drawing.Drawing2D.GraphicsPath(); int width = this.ClientSize.Width; int height = this.ClientSize.Height; p.AddClosedCurve(new Point[]{new Point(width/2, height/2), new Point(width,0), new Point(width, height/3), new Point(width-width/3, height), new Point(width/7, height-height/8)}); this.Region = new Region(p); }

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• C# database file directory

  - by Simon

  I'm using the windows forms aplication with an ms access database. And i would like to know if there is a way to show the directory of the database file (to save data in it)excpet like this: string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=save.mdb"; or this: "Data Source=D:\Simonova aktovka na namizju\matura\test5\save.mdb"; couse if i use the first one the aplication undos the changes i've made when i close it(the aplication) the second one makes me have to change the path everytime i bring the aplication to another computer(cous the direktory is different of coars) So... is there another way?

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• Html combo box to database record Id

  - by LanguaFlash

  I'm fairly sure there has to be a simple solution to my problem, but I am a new web developer and can't quite figure it out. On my page I have a combo box whose values are filled from my database. When the user submits the form, how to I go about converting those values back to the record numbers in the database? Up to now I have been just doing a sort of reversed lookup in my database to try to get the record's ID. This has quite a few obvious flaws and I am sure that there has to be a better way. I am used to MS Forms combo boxes where the record data and ID are never separated. But in the case of a web form, I have no way to do multiple columns in the combo box like I am used to. Thanks! Jeff

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• I Clean Solution'd my Winform App and now it's broken...

  - by Refracted Paladin

  I have a Winform App that uses a 3rd Party Library of Controls, DevExpress. I also created a bunch of Controls myself, extending those controls. Everything has been working fine when all of a sudden I opened VS today and on the Design Page all my extended controls were missing. I then tried rebuilding to no avail. Then I tried Cleaning and Rebuilding and made it even worse. Now I have tons(520) of erros stating things like -- Error 179 The name 'datBirthDate' does not exist in the current context D:\Documents\Visual Studio 2008\Projects\MatrixReloaded\MatrixReloaded\Controls\Member\ucGeneral.cs 339 17 MatrixReloaded also if I try to open a form or user control in Design Mode I first get this -- could not find type, "MyType" please make sure that the assembly that contains this type is referenced and then, if I click Ignore and Continue I get this for all Forms and Contros when I try and look at them in Design Mode -- Exception of type System.OutOfMemoryException was thrown Help!?!? When I googled I came across mostly references to VS 2003...I am on 2008 sp1.

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• How should I use color in my application? Single, Theme, or Chaos?

  - by CodeSlave

  How should I be using color in my application? I have over a 100 different forms (windows) in my application, and the default windows grey seems like a bad choice to me. One school of thought says pick one neutral color, and use the same one everywhere. Another school of thought says pick a set of neutral colors, and use them same ones within a group of form (e.g., shipping screens might be light green, receiving screens light orange, user administration screens light blue, etc.). The final school of thought says make every form different. We've got millions of colors, why not use them? What should I do and why?

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• Merging a custom ContextMenuStrip with the system edit context menu in a DataGridView

  - by Tom

  I have a DataGridView in a VB.NET app that I have limited to cell selection only. The control has two columns, the first is not editable, the second is editable. I have a ContextMenuStrip that provides some additional functionality and I am able to make it appear when an editable cell receives a right click and is not in edit mode. Based on an example in a Microsoft forum, I am able to now show the context menu when an editable cell receives a right click while also in edit mode. That code is as follows: Private Sub DataGridView1_EditingControlShowing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles DataGridView1.EditingControlShowing If TypeOf e.Control Is TextBox Then With DirectCast(e.Control, TextBox) .ContextMenuStrip = ContextMenuStrip1 End With End If End Sub This, however, completely overwrites the system context menu of the editing control. How can I merge my Context Menu Strip (ContextMenuStrip1) with the system context menu? For further information, I am using VS2008, but targeting the .NET 2.0 platform.

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• django-uni-form helpers and CSRF tags over POST

  - by linked

  Hi, I'm using django-uni-forms to display my fields, with a rather rudimentary example straight out of their book. When I render the form fields using <form>{%csrf_tag%} {%form|as_uni_form%}</form>, everything works as expected. However, django-uni-form Helpers allow you to generate the form tag (and other helper-related content) using the following syntax -- {% with form.helper as helper %}{% uni_form form helper%}{%endwith%} -- This creates the <form> tag for me, so there's nowhere to embed my own CSRF_token. When I try to use this syntax, the form renders perfectly, but without a CSRF token, and so submitting the form fails every time. Does anyone have experience with this? Is there an established way to add the token? I much prefer the second syntax, for re-use reasons. Thanks!

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• Using STI path with same controller

  - by TenJack

  I am using STI and am wondering, do I have to have a separate controller for each model? I have a situation where I only use the create and edit actions for one model in the STI relationship, but I get an 'undefined method' error if I try to do a form for. More specifically, I have two models that inherit from List: class RegularList < List class OtherList < List and I have a lists controller that handles these actions, but I only create new models with RegularList using forms. i.e. the only situation where I use a form_for to create a new List object is with RegularList. What I would like to do is something like: class ListsController < ApplicationController def new @list = RegularList.new end otherwise the route for creating a new list looks like regular_list/new but I would like it to just be list/new. Thoughts?

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• Create a ActiveX with a MFC existing application

  - by Jesús Galindo

  Hello! I'm trying to convert my MFC application, a simple "PaintBrush" app that draws lines and rectangles (it's only a little test from another bigger application), to a ActiveX Control that a could embed into a Windows Forms Application (with Visual C#). I didn't found any tutorial for do this, and now, I'm not sure that this it's possible. I know how create an ActiveX Control recently created but not how convert an existing application. Have anybody know how I can do this? Thanks!

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• How can I make a Yes/No combobox return true/false?

  - by Kasper Hansen

  I am new to creating forms in Visual Studio and C#. But I made a UI that has some comboboxes where the DropDownStyle is DropDownList. The items shown is Yes and No. But I need to assign this as a boolean value to a property on some object ai and currently do this: if (cmbExample.Text == "Yes") { ai.isPacketType = true; } else if (cmbExample.Text == "No") { ai.isPacketType = false; } I basically want to do something like this (or some other one liner): ai.isPacketType = cmbExample.Text; How do I link the Text Yes to the value true and No to false?

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• How to make a thread stay runnig in c#

  - by menachem

  Hello, I have a Windows Form Application (Form1) that allow the user to open another Forms (FormGraph). In order to open the FormGraph App I use a thread that open it. Here is the code that the thread is running: private void ThreadCreateCurvedGraph() { FormGraph myGraph = new FormGraph(); myGraph.CreateCurvedGraph(...); myGraph.Show(); } My problem is that myGraph closed right after it's open. 1) Does anyone know why this is happening and how to make myGraph stay open? 2) After the user closed myGraph, How do I terminate the thread? Many thanks!

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• Code First / Database First / Model First : are they just personnal preferences?

  - by Antoine M

  Merely knowing the internal functionality of each approaches, and after reading a lot of posts, I still can't figure out if each one of them is just a matter of personnal preference for the developper or if they deserve different axes of productivity ? Does one of them should be applyed for some specific productivity needs or MS is just beeing kind offering three different flavours ? Should we consider CF as a sort of improvement over DBF or MF and thinking of it as a futur standard on wich spending a peculiar intelectual investment ... ? Is there a link showing a sort of synthetic table with un-passionate pros and cons for each approach, a little bit like for web-forms and MVC. Sorry for those who will find this question redondant. I know it is.

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• CgiModule and FastCgiModule in IIS7

  - by hari

  My web server is IIS7 running on Windows 2008 Web edition. There are nearly 40 modules when checked pre-installed "Modules". It also having "CgiModule and FastCgiModules". All the websites installed on this server purely runs with ASP.NET technology. Can I remove these two modules to improve performance? Same way, my application uses "Forms Authentication" only. In such case can I delete "Windows Authentication and WindowsAuthenticationModule"?. Also please suggest if any other modules can be deleted to improve performance.

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• Code igniter authentication code in controller security question

  - by Prime Studios

  I have a main controller to handle the very front-end of my authentication system, it handles login, logout, update user info, etc. functions that I anticipate calling by POST'ing from views/forms. What about something like a "delete_user" function though? My thoughts are a button in someones admin panel would say "Delete Account" and it would post to "/auth/delete", and the function would delete the user based on their session username or id. This seems a bit open ended, you could send out a link to someone and when they opened it while in that application it would delete their account.. Whats the best way to handle this?

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• Another question about ASP.NET MVC and a separate project for helper classes

  - by rockinthesixstring

  I know this topic has been discussed to death, but there is one thing that I can't wrap my head around. I'm working on a Web Application using ASP.NET MVC and I come across a scenario where I need a helper class (this usually happens in the early stages of development. So I go ahead and create a helper project in my solution that I use to manage all of my Helper Classes. Now, do I have to build that project and dump the dll in the bin directory every time I make changes to is, or is there a way to have the main web application reference the classes contained within the separate project without the separate build process? I'm just looking for the easiest way to add helper classes without the hastel of building and moving the dll every time I make a change or addition. Also, sorry for the very newbie-esque question here. All of the web apps I've build in the past have all been in the same project (web forms, App_Code, etc).

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• How to test using conditional defines if the application is Firemonkey one?

  - by Gad D Lord

  I use DUnit. It has an VCL GUITestRunner and a console TextTestRunner. In an unit used by both Firemonkey and VCL Forms applications I would like to achieve the following: If Firemonkey app, if target is OS X, and executing on OS X - TextTestRunner If Firemonkey app, if target is 32-bit Windows, executing on Windows - AllocConsole + TextTestRunner If VCL app - GUITestRunner {$IFDEF MACOS} TextTestRunner.RunRegisteredTests; // Case 1 {$ELSE} {$IFDEF MSWINDOWS} AllocConsole; {$ENDIF} {$IFDEF FIREMONKEY_APP} // Case 2 <--------------- HERE TextTestRunner.RunRegisteredTests; {$ELSE} // Case 3 GUITestRunner.RunRegisteredTests; {$IFEND} {$ENDIF} Which is the best way to make Case 2 work?

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• jquery - strange behavior in IE..

  - by stackoverflow

  I have an input field where name='id' <input type='hidden' name="id" /> While jquery lib works fine in Chrome, it fails in IE. It works when I change from id to idfield - but our server code breaks since it expects the form with element key id. Is there a work around for this? PS: I cannot change the server code. jquery version 1.3.2 using dynamic forms $(document).ready(function(){ $("#formRow").dynamicForm("#plus3", "#minus3", {limit:100, createColor:'yellow',removeColor: 'red' }); }); Happens when the Add row button is clicked

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• c# - clear surface when resizing

  - by dhh

  Hello, I'm trying to build my own custom control for a windows forms application in C#.Net. Currently I paint some rectangles and other graphic elements using the paint event. When I now resize the app form to fit the desktop size, all elements are repainted (which is exactly the behaviour I need) but the old one's are shown in the background. Here's what I'm doing by now: Pen penDefaultBorder = new Pen(Color.Wheat, 1); int margin = 5; private void CustomControl_Paint(object sender, PaintEventArgs e) { CustomControl calendar = (CustomControl)sender; Graphics graphics = e.Graphics; graphics.Clear(Color.WhiteSmoke); graphics.DrawRectangle(penDefaultBorder, margin, margin, calendar.Width - margin * 2, calendar.Height - margin * 2); //... } Neither the graphics.Clear, nor adding a graphics.FillRectangle(...) will hide the old rectangle from the surface. Ideas? Thank you all.

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