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• How hard is it for a .NET programmer to learn Objective C and Cocoa?

  - by rsteckly

  Hi, I'm trying to build a dual platform application for a company of my own I'm trying to start at night. I have the .NET version done, but have not finished the UI part. I'm thinking of buying some 3rd party controls. If I buy these controls, however, they clearly will only work in my Windows version. I'm wondering if I should try to do the UI in GTK# and use Mono with CocoaSharp or just build the thing in MS technology and teach myself the Mac side? I'm just really unfamiliar with the Mac world and am wondering how much of a learning curve there might be. I've thought perhaps of rewriting my core logic in Ruby or Python. This why I could use the .NET version with .NET controls and presumably hook the same code up on the Mac. It's an educational app targeted at consumers. As such, it shouldn't require a lot of technical sophistication to install.

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• .NET/C# Drizzle database client

  - by FlappySocks

  I am planning to use Drizzle in my next C# Mono app. Since there is no C# client available for Drizzle, I thought I would have a stab at writing my own by converting the Java client, and then making it work with DBLinq. Having seen the Java client, I realise that it's a longer job that I had anticipated, and I don't have the time. Besides the Java client is not all that mature yet. Since there is an official Drizzle C client library (libdrizzle), writing a C# wrapper might be the best solution. Are there any tools available that can assist in generating the code for this?

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• Exposing an ISO C++ class to C#

  - by Stick it to THE MAN

  I need to expose some C++ classes to C# (I am building on Linux, using mono, so COM is not an option) The evidence I have gathered so far suggests that the best way to approach this is: Write a wrapper C++.Net class around the ISO C++ class Consume the C++.Net classes from C# I have the following questions: First, is this the "best" way of achieving the goal of exposing ISO C++ classes to C# ? So far though, I have not seen any examples that actually show how to do this - can anyone suggest some links, or a code snippet to show how this is done for a dummy class? How may I send asynchronous message notifications from the C++ code to the C# code ?. Ideally, I would like to cause the C# class to raise an event, with the received data as an argument

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• MonoDevelop in Linux -- Terminal Commands

  - by Sandeep Bansal

  Hi everyone, I want to make a C# app in Mono as it's the only programming language I'm mostly comfortable with. Anyway, ATI Drivers on Linux do not have a Fan control feature and therefore the cards to tend to heat up. For me I prefer to have a cooler card. What I want to do is run a command such as: aticonfig --pplib-cmd 'set fanspeed 0 70' In a application but I the thing is..How can I run that code so it works, I am currently running Ubuntu 10.04, and it does work in the terminal, but I want to implement it into an application. Thanks

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• Mouse move and thread

  - by bsebi

  When I move the mouse over the window, the program runs much faster (cc. 3 times). This is a real time webcam .Net/Mono application running on a MacBook. On Windows works perfect. Is this maybe a power saving function of the laptop? The code: Thread t = new Thread(Foo); t.Priority = ThreadPriority.Highest; // I've tried without priority too, doesn't matter t.Start(); ... void Foo() { while (true) { ++k; // then write k to the window somehow } }

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• Should a protected property in a C# child class hide access to a public property on the parent?

  - by Tim

  I have the following code: public class Parent { public string MyField { get; set; } } public class Child : Parent { protected new int MyField { get; set; } } I try and access this with: static void Main(string[] args) { Child child = new Child(); child.MyField = "something"; } Visual studio 2008 compiles this without comment, but under Mono (2.4.2, Ubuntu) I get the error message 'HideTest.Child.MyField' is inaccessible due to its protection level (CS0122) Is one implementation or the other more compliant with the standard here?

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• Using the MySql ASP.NET membership provider with existing users

  - by ScottBelchak

  I have been tasked with migrating an existing mature ASP.NET 2.0 web site to NHibernate, Mono and MySQL or postgres. I am somewhat confused as how the membership provider salts the passwords. If I make the switch and use the MySQL membership provider (outlined in this question) or AspSqlProvider, will the existing users be able to login? I guess it would be easier for me to ask: How the hell do I get access to the encryption key used by the ASP.NET membership provider that salts the passwords so that I can use the same one in a third party provider?

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• Using Linux C code and header files to compile a Windows DLL

  - by df382

  I would like to know if in general it is possible to create a C++ DLL with Visual C++ 2010 starting from C code and the header files I find in a Linux distribution. Theoretically, if I take a piece of C code (that includes different header files) from Linux and I find in the Linux file system all the header files needed for the linkage of the project, will I be able to successfully compile the project in Windows with Visual C++ 2010? Are there some examples or a tutorial for doing this? After compiling a DLL, I would like to use it in a C# application, which I will run under Linux with Mono.

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• New thread per client connection in socket server?

  - by Olaseni

  I am trying to optimize multiple connections per time to a TCP socket server. Is it considered good practice, or even rational to initiate a new thread in the listening server every time I receive a connection request? At what time should I begin to worry about a server based on this infrastructure? What is the maximum no of background threads I can work, until it doesn't make any sense anymore? Platform is C#, framework is Mono, target OS is CentOS, RAM is 2.4G, server is on the clouds, and I'm expecting about 200 connection requests per second.

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• How to create a web framework in C# without ASP?

  - by Mark

  I've managed to get a C# asp page running under ubuntu/apache/mono, but I don't want to write my framework in these ASP pages, I want to use straight C# and then I'll use a templating language for my views. But I don't know where to begin? C# is a compiled language, so... how would I do this? Would I compile everything and then have apache hook into the (single) executable and pass in the the request URL? Could I request specific .cs pages and then have apache tell it to compile and then "display" it only if it's been updated? Can the "view" files be compiled individually to avoid having to recompile everything every time there's a change? Is there some "base" I can work from, or am I going to have to reinvent accessing GET and POST variables (by reading header info) and all sorts of other stuff we take for granted in languages like PHP?

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• GTK#-related error on MonoDevelop 2.8.5 on Ubuntu 11.04

  - by Mehrdad

  When I try to create a new solution in MonoDevelop 2.8.5 in Ubuntu 11.04 x64, it shows me: System.ArgumentNullException: Argument cannot be null. Parameter name: path1 at System.IO.Path.Combine (System.String path1, System.String path2) [0x00000] in <filename unknown>:0 at MonoDevelop.Core.FilePath.Combine (System.String[] paths) [0x00000] in <filename unknown>:0 at MonoDevelop.Projects.ProjectCreateInformation.get_BinPath () [0x00000] in <filename unknown>:0 at MonoDevelop.Projects.DotNetProject..ctor (System.String languageName, MonoDevelop.Projects.ProjectCreateInformation projectCreateInfo, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 at MonoDevelop.Projects.DotNetAssemblyProject..ctor (System.String languageName, MonoDevelop.Projects.ProjectCreateInformation projectCreateInfo, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 at MonoDevelop.Projects.DotNetProjectBinding.CreateProject (System.String languageName, MonoDevelop.Projects.ProjectCreateInformation info, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 at MonoDevelop.Projects.DotNetProjectBinding.CreateProject (MonoDevelop.Projects.ProjectCreateInformation info, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 at MonoDevelop.Projects.ProjectService.CreateProject (System.String type, MonoDevelop.Projects.ProjectCreateInformation info, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 at MonoDevelop.Ide.Templates.ProjectDescriptor.CreateItem (MonoDevelop.Projects.ProjectCreateInformation projectCreateInformation, System.String defaultLanguage) [0x00000] in <filename unknown>:0 at MonoDevelop.Ide.Templates.ProjectTemplate.HasItemFeatures (MonoDevelop.Projects.SolutionFolder parentFolder, MonoDevelop.Projects.ProjectCreateInformation cinfo) [0x00000] in <filename unknown>:0 at MonoDevelop.Ide.Projects.NewProjectDialog.SelectedIndexChange (System.Object sender, System.EventArgs e) [0x00000] in <filename unknown>:0 I strace'd it and saw repeated failed accesses to files like: /usr/lib/mono/gac/gtk-sharp/2.12.0.0__35e10195dab3c99f/libgtk-x11-2.0.so.0.la so I'm assuming that's the cause of the problem. However, I've installed (and re-installed) anything GTK#-related that I could think of... and the error still occurs. Does anyone know how to fix it?

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• SIGABRT error when running MonoTouch application

  - by hambonious

  I'm new to MonoTouch and 9 times out of 10, when I try to run my MonoTouch app on the iPhone simulator (debug mode and regular), I receive a long error output that begins with the following message: Error connecting stdout and stderr (127.0.0.1:10001) Couldn't register com.yourcompany.[appnamehere] with the bootstrap server. Error: unknown error code. This generally means that another instance of this process was already running or is hung in the debugger.Stacktrace: at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <0x00004 at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <0x00004 at MonoTouch.UIKit.UIApplication.Main (string[],string,string) <0x00089 at MonoTouch.UIKit.UIApplication.Main (string[]) <0x00014 at PodcastManager.Application.Main (string[]) <0x00010 at (wrapper runtime-invoke) .runtime_invoke_void_object (object,intptr,intptr,intptr) <0x00043 And ends with: ================================================================= Got a SIGABRT while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application. ================================================================= The weird thing is it will work some of the time. Once, a reboot of my machine did it. Others, just restarting MonoDevelop and/or the simulator. I can provide the entire error output if you think that may help. Any ideas?

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• What is the right approach to checksumming UDP packets

  - by mr.b

  I'm building UDP server application in C#. I've come across a packet checksum problem. As you probably know, each packet should carry some simple way of telling receiver if packet data is intact. Now, UDP already has 2-byte checksum as part of header, which is optional, at least in IPv4 world. Alternative method is to have custom checksum as part of data section in each packet, and to verify it on receiver. My question boils down to: is it better to rely on (optional) checksum in UDP packet header, or to make a custom checksum implementation as part of packet data section? Perhaps the right answer depends on circumstances (as usual), so one circumstance here is that, even though code is written and developed in .NET on Windows, it might have to run under platform-independent Mono.NET, so eventual solution should be compatible with other platforms. I believe that custom checksum algorithm would be easily portable, but I'm not so sure about the first one. Any thoughts? Also, shouts about packet checksumming in general are welcome.

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• Starting and stopping firefox from c#

  - by Lucas Meijer

  When I start /Applications/Firefox.app/Contents/MacOS/firefox-bin on MacOSX using Process.Start() using Mono, the id of the process that gets returned does not match the process that firefox ends up running under. It looks like firefox quickly decides to start another process, and kill the current one. This makes it difficult to stop firefox, and to detect if it is still running. I've tried starting firefox using the -no-remote flag, to no avail. Is there a way to start firefox in such a way that it doesn't do this "I'll quickly make a new process for you" dance? The situation can somewhat be detected by making sure Firefox keeps on running for at least 3 seconds after its start, and when it does not, scan for other firefox processes. However, this technique is shaky at best, as on slow days it might take a bit more than 3 seconds, and then all tests depending on this behaviour fail. It turns out, that this behaviour only happens when asking firefox to start a specific profile using -P MyProfile. (Which I need to do, as I need to start firefox with specific proxyserver settings) If I start firefox "normally" it does stick to its process.

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• Unity in C# for Platform Specific Implementations

  - by DxCK

  My program has heavy interaction with the operating system through Win32API functions. now i want to migrate my program to run under Mono under Linux (No wine), and this requires different implementations to the interaction with the operating system. I started designing a code that can have different implementation for difference platform and is extensible for new future platforms. public interface ISomeInterface { void SomePlatformSpecificOperation(); } [PlatformSpecific(PlatformID.Unix)] public class SomeImplementation : ISomeInterface { #region ISomeInterface Members public void SomePlatformSpecificOperation() { Console.WriteLine("From SomeImplementation"); } #endregion } public class PlatformSpecificAttribute : Attribute { private PlatformID _platform; public PlatformSpecificAttribute(PlatformID platform) { _platform = platform; } public PlatformID Platform { get { return _platform; } } } public static class PlatformSpecificUtils { public static IEnumerable<Type> GetImplementationTypes<T>() { foreach (Assembly assembly in AppDomain.CurrentDomain.GetAssemblies()) { foreach (Type type in assembly.GetTypes()) { if (typeof(T).IsAssignableFrom(type) && type != typeof(T) && IsPlatformMatch(type)) { yield return type; } } } } private static bool IsPlatformMatch(Type type) { return GetPlatforms(type).Any(platform => platform == Environment.OSVersion.Platform); } private static IEnumerable<PlatformID> GetPlatforms(Type type) { return type.GetCustomAttributes(typeof(PlatformSpecificAttribute), false) .Select(obj => ((PlatformSpecificAttribute)obj).Platform); } } class Program { static void Main(string[] args) { Type first = PlatformSpecificUtils.GetImplementationTypes<ISomeInterface>().FirstOrDefault(); } } I see two problems with this design: I can't force the implementations of ISomeInterface to have a PlatformSpecificAttribute. Multiple implementations can be marked with the same PlatformID, and i dont know witch to use in the Main. Using the first one is ummm ugly. How to solve those problems? Can you suggest another design?

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• GTK+ widgets/windows being (randomly) corrupted, with what seems to be timers.

  - by nubela

  Hi, I have recently implemented a scrolling text across an area of limited screen estate using a timers repeating every 100ms, and some simple string appending. However, after this very implementation, I have come to realise that my GUI is getting randomly bugged/corrupted after a certain while. That is to say that some widgets/windows become completely white, and eventually the entire GUI turns white and unclickable. What is weird is that there is no error debug output at all. Having said that, I am using Mono with GTK-Sharp for the application. Does anyone have an idea or a possible clue how and why this is happening? If not, how can I further debug this properly? Thanks, really appreciate it. PS: Sometimes, it takes up to 1.5 hours for the thing to start corrupting, it has random timeframes for it to start happening. This is my the code implemented that caused this issue: void ScrollSyncTo(object sender, System.Timers.ElapsedEventArgs e) { //initial check if it fits nicely alr if (sync_to_full_txt.Length <= sync_to_max_char) { sync_to_timer.Stop(); return; } //check for pause if (sync_to_pause >= 0) { sync_to_pause--; return; } //check direction int temp_psn; string temp_str; if (sync_to_direction) { temp_psn = sync_to_posn + 1; if (sync_to_full_txt.Substring(temp_psn).Length < sync_to_max_char) { sync_to_pause = sync_to_break_steps; sync_to_direction = false; sync_to_posn = sync_to_full_txt.Length - 1; System.GC.Collect(); return; } else { temp_str = sync_to_full_txt.Substring(temp_psn, sync_to_max_char); } } else { temp_psn = sync_to_posn - 1; if (temp_psn + 1 < sync_to_max_char) { sync_to_pause = sync_to_break_steps; sync_to_direction = true; sync_to_posn = 0; System.GC.Collect(); return; } else { temp_str = sync_to_full_txt.Substring(temp_psn - sync_to_max_char + 1, sync_to_max_char); } } //lets move it sync_to.Text = temp_str; sync_to_posn = temp_psn; }

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• MonoTouch & SQLite - Cannot open database after previous successful connections

  - by Tanis Draven

  I am having difficulty in reading data from my SQLite database from MonoTouch. I can read and write without any difficulty for the first few screens and then suddenly I am unable to create any further connections with the error: Mono.Data.Sqlite.SqliteException: Unable to open the database file at Mono.Data.Sqlite.SQLite3.Open (System.String strFilename, SQLiteOpenFlagsEnum flags, Int32 maxPoolSize, Boolean usePool) [0x0007e] in /Developer/MonoTouch/Source/mono/mcs/class/Mono.Data.Sqlite/Mono.Data.Sqlite_2.0/SQLite3.cs:136 at Mono.Data.Sqlite.SqliteConnection.Open () [0x002aa] in /Developer/MonoTouch/Source/mono/mcs/class/Mono.Data.Sqlite/Mono.Data.Sqlite_2.0/SQLiteConnection.cs:888 I ensure that i dispose and close every connection each time i use it but still i have this problem. For example: var mySqlConn = new SqliteConnection(GlobalVars.connectionString); mySqlConn.Open(); SqliteCommand mySqlCommand = new SqliteCommand(SQL, mySqlConn); mySqlCommand.ExecuteNonQuery(); mySqlConn.Close(); mySqlCommand.Dispose(); mySqlConn.Dispose(); I'm guessing that I'm not closing the connections correctly. Any help would be greatly appreciated.

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• Where i must put .xnb files in mono game project using VS2010?

  - by user23899

  Hello there my problem was describe below In the "The Content Pipeline" paragraph http://blogs.msdn.com/b/bobfamiliar/archive/2012/08/07/windows-8-xna-and-monogame-part-3-code-migration-and-windows-8-feature-support.aspx#comments Author describe how fix it using VS2012 put xnb files to \AppX\Content folder but i use VS2010 and mono game templates for it and there is no folders like this so where i must put this asstes to run game correctly

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• MonoTouch 3.0.6 supports iPhone OS 4 what about legal issues

  - by geekmangnu

  Now MonoTouch supports iPhone OS 4 with current 3.0.6 version but Apple banned all programming languages beside C/C++/Objective-C. So it is confusing why Novell supports iPhone OS 4 if it is banned? Is there any exception for MonoTouch we don't know yet? I am aware of previous stackoverflow question Is MonoTouch now banned on the iPhone? But MonoTouch iPhone OS 4 support is new. I asked to MonoTouch support about this issue but they haven't answered yet (more than a day). I am about to start iPhone development and MonoTouch seems promising however I wonder future of the MonoTouch. An answer from Novell or Apple will be appreciated. If you know something please share. Thanks

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• Where is ~/.config/MonoDevelop/ for MonoDevelop

  - by jpm

  I'm using Mac Snow Lepord and can't find "~/.config/MonoDevelop/" for the life of me. I have MonoDevelop (v2.2.2) up and running already, but when I tried to set up a template the IDE started having problems. Namely, whenever I went to Monodevelop - preferences- Code Templates I would get an error saying "Argument cannont be null". I tried removing MonoDevelop from my Mac and re-installing but that doesn't appear to fix this problem so I thought if I could find the above folder maybe I could remove that. However I am not sure how to find it. I put the address directly into Mac's "finder" search box and no results were returned. Can anyone help?

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• Anybody else using MonoDevelop?

  - by supercheetah

  I'm starting a new project in MonoDevelop, and I want to see how other projects are using it. I tried searching through SourceForge, code.google.com, etc., but mostly I was just finding things like add ins or something related to MonoDevelop itself. So is there anyone else using MonoDevelop, especially open source?

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• How do I access GUI (GTK) from multi threads?

  - by nubela

  I have a worker thread spawned from a GUI (for GUI performance), how do I access GUI, such as spawning new windows/widgets from the thread itself? I tried using delegates but it doesn't seem to be working. Any ideas? Possibly examples? Thank you.

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• gtksourceview-sharp help

  - by mail_321

  Is there any quick tutorial on the net on how to get started with using gtksourceview-sharp? I have gtksourceview-sharp.dll but I can't get it to work, even when I have the libgtksourceview-1.0-0.dll in the same directory with it... Thanks!

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• How to generate XML with attributes in c#.

  - by user292815

  I have that code: ... request data = new request(); data.username = formNick; xml = data.Serialize(); ... [System.Serializable] public class request { public string username; public string password; static XmlSerializer serializer = new XmlSerializer(typeof(request)); public string Serialize() { StringBuilder builder = new StringBuilder(); XmlWriterSettings settings = new XmlWriterSettings(); settings.OmitXmlDeclaration = true; settings.Encoding = Encoding.UTF8; serializer.Serialize( System.Xml.XmlWriter.Create(builder, settings ), this); return builder.ToString(); } public static request Deserialize(string serializedData) { return serializer.Deserialize(new StringReader(serializedData)) as request; } } I want to add attributes to some nodes and create some sub-nodes. Also how to parse xml like that: <answer> <player id="2"> <coordinate axis="x"></coordinate> <coordinate axis="y"></coordinate> <coordinate axis="z"></coordinate> <action name="nothing"></action> </player> <player id="3"> <coordinate axis="x"></coordinate> <coordinate axis="y"></coordinate> <coordinate axis="z"></coordinate> <action name="boom"> <1>1</1> <2>2</2> </action> </player> </answer> p.s. it is not a xml file, it's answer from http server.

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• MonoDevelop: Addin generation issues

  - by calmcajun

  I am having problems creating the root.mrep file for a updated MonoDevelop Addin. The Addin was originally built for MonoDevelop 2.2. I am able to build the updated project but when I use mdrun.exe setup rep-build to generate the .mrep files(main and root) it only generates the main.mrep file and not the root.mrep file. Is there a new way of building the addin that I am missing? I used both setup pack and then setup rep-build. I have listed a snippet of the addin.xml file below: <Addin id = "Addin" namespace = "MonoDevelop" name = "Monobjc development" author = "Rob L" copyright = "" description = "Addin" category = "Mac Development" version = "1.0"> <Runtime> <Import assembly="MonoDevelop.Sample.dll" /> <Import assembly="MonoDevelop.MacDev.dll" /> <Import assembly="Sample.Tools.dll" /> </Runtime> <Dependencies> <Addin id="Core" version="2.4" /> <Addin id="Core.Gui" version="2.4" /> <Addin id="Projects" version="2.4" /> <Addin id="Projects.Gui" version="2.4" /> <Addin id="Ide" version="2.4" /> </Dependencies> <MoreStuffHere /> </Addin>

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