rits plasman - Developer IT

When to start thinking about scalability?

- by Rits

I'm having a funny but also terrible problem. I'm about to launch a new (iPhone) app. It's a turn-based multiplayer game running on my own custom backend. But I'm afraid to launch. For some reason, I think it might become something big and that its popularity will kill my poor lonely single server + MySQL database. On one hand I'm thinking that if it's growing, I'd better be prepared and have a scalable infrastructure already in place. On the other hand I just feel like getting it out into the world and see what happens. I often read stuff like "premature optimization is the root of all evil" or people saying that you should just build your killer game now, with the tools at hand, and worry about other stuff like scalability later. I'd love to hear some opinions on this from experts or people with experience with this. Thanks!

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How can I fill a rect with an alpha color using CoreGraphics?

- by Rits Plasman

In my drawRect method, I am drawing a PNG image. On top of that, I want to draw a rect with a 20% alpha color, like this: [[UIColor colorWithWhite:0.0 alpha:0.2] set]; UIRectFill(rect); The problem is, that the alpha property seems to get ignored. No alpha is applied at all, just a black rectangle is drawn. How can I fix this? Thanks in advance!

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Outlook 2003 not working with gmail IMAP.

- by rits

I am trying to configure Outlook express 2003 with gmail (IMAP enabled) But my outlook is giving me this error. ScreenShot of Error How to rectify this problem???

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Installing Rails, MySQL, etc. everything goes wrong

- by Rits

I've been struggling with this for a few hours. Everything just stopped working and I can't get it to work anymore. I'm a noob at Ruby, Ruby on Rails and the Terminal in general. This is really frustrating me so I just try to describe my problem as detailed as possible hoping someone can give me a solution. I'm on Mac OS X Snow Leopard. I couldn't get Rails working at all just now: Could not find gem 'rails' headaches But after some tries of reinstalling it, it suddenly worked again. But now I just can't get MySQL to work, and it sometimes even breaks the Rails installation again. This is what I do: sudo gem uninstall rails sudo gem uninstall mysql sudo gem uninstall mysql2 After these commands, I check the installed gems with gem list. No MySQL gem is listed anymore, but I can still see rails (2.3.5, 2.2.2, 1.2.6) . Is this normal? Does this mean I have 3 Rails installations? It doesn't make sense to me. Anyway, then I do this: sudo gem clean Which fails completely. I get a bunch of errors like this: Attempting to uninstall fcgi-0.8.7 Unable to uninstall fcgi-0.8.7: Gem::InstallError: cannot uninstall, check gem list -d fcgi It doesn't uninstall anything. At this point, I try to install everything again. I start with: sudo gem install rails Which succeeds (I think): Successfully installed rails-3.0.3 Successfully installed builder-2.1.2 2 gems installed Installing ri documentation for rails-3.0.3... File not found: lib Then, I update RubyGems: sudo gem update --system sudo gem install rubygems-update sudo update_rubygems Then it says I have 1.3.7 installed, so it succeeded, I think. So now I proceed with installing MySQL. I already got MySQL 5.5.8 installed on my machine. I did some research about installing MySQL on Snow Leopard, and it seems I have to use this command: sudo env ARCHFLAGS="-arch x86_64" gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config I get a bunch of errors like this: No definition for time_set_neg No definition for time_set_second_part No definition for time_equal No definition for error_errno At this point, I assume I got both Rails and the MySQL gem installed, so I try to start a new project. rails new user_group -d mysql It works! Rails is installed correctly. Now, I try generating a model. cd user_group rails generate model User It fails with this error: Could not find gem 'mysql2 (= 0, runtime)' in any of the gem sources listed in your Gemfile. Try running bundle install. So I try running bundle install. It installs a lot of gems. Then I try to generate my model again. I get this error: Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle: dlopen(/Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.16.dylib (LoadError) Referenced from: /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle Reason: image not found - /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle This is as far as I can get. What should I do? And why should this be so hard...

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Single console in eclipse for both Server and Client

- by rits

I am building a client server application using Java Sockets (in Windows XP). For that I need different consoles for both Client and Server(for Input and Output operations). But in eclipse both share a single console. Is there any plugin or some sort of cheat through which I can do this. After googling I got this, http://dev.eclipse.org/newslists/news.eclipse.newcomer/msg17138.html But, this seems to be only for write operations, not read operations. Also, I tried the following to launch application manually, but even this is not working........ package mypack; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.io.PrintStream; public class MySystem { public static void changeStream(String mainFile) throws IOException{ File temp = new File(".") ; String parentPath = temp.getCanonicalPath() ; System.out.println(parentPath); //creation of batch file starts here try{ File f = new File(parentPath + "\\a.bat") ; System.out.println("Created : " + f.createNewFile()); //f.deleteOnExit() ; FileOutputStream fos = new FileOutputStream(f) ; String str = "java " + mainFile ; String batchCommand="@echo off\n"+str+"\npause\nexit"; char arr[] = batchCommand.toCharArray() ; System.out.println(str) ; for(int i = 0 ; i < arr.length ; i++){ fos.write(arr[i]) ; } fos.close() ; } catch(Exception e){ } //creation of batch file ends here //execution of batch file starts here try{ Runtime r = Runtime.getRuntime() ; System.out.println(parentPath + "\\a.bat") ; Process p = r.exec(new String[]{"cmd","/k","start a.bat"},null,new File(parentPath)) ; OutputStream os = (OutputStream)p.getOutputStream() ; System.setOut( new PrintStream(os) ) ; System.out.println("Hello"); } catch(Exception e){ e.printStackTrace(); } //execution of batch file ends here } public static void main(String[] args) throws IOException { MySystem.changeStream("MySystem") ; } }

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Statement.RETURN_GENERATED_KEYS concept

- by rits

import java.sql.* ; import java.util.* ; import java.io.* ; class DataBaseFactory{ public static Connection getConnection(){ ... ... ... ... } } class Demo{ public static void main(String []args) throws SQLException{ Connection con = DataBaseFactory.getConnection() ; //This is throwing exception //PreparedStatement ps = con.prepareStatement("insert into user values(?,?)", Statement.RETURN_GENERATED_KEYS) ; //But this is working fine PreparedStatement ps = con.prepareStatement("insert into user values(?,?)") ; } } thnx in advance to all the java people here....

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Are @property's necessary for Interface Builder?

- by Rits

In my UIViewController subclass, I have 3 UIView's with each a @property as an IBOutlet. I do not use these properties at all in my code. The views get instantiated as soon as the view controller is created and they are deallocated when the view controller is deallocated. I was thinking; can't I just remove the @property's? I did, and I could still connect my instance variables (with IBOutlet) in Interface Builder. So my question now is; is there any use for properties in combination with Interface Builder, or is it OK to leave them out? Is it required for some memory management or something? Or are they really just for use in your own code? And if I do leave them out, do I still need to release them in dealloc?

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Loading UINavigationController subclass from a Nib

- by Rits

My situation is as follows: My class SettingsViewController is a subclass of UINavigationController. That class contains the logic of its rootViewController. For example, it acts as the delegate and data source for two table views in that root view controller. I have no problem setting this up programmatically. In the initializer of SettingsViewController, I can create an additional UIViewController to serve as the root view controller, position the table views in its view, and set their delegates and data sources to self. But I want to load that root view via a Nib. The problem is, I do not know how to connect that Nib with my SettingsViewController, how to set the delegates and data sources. The SettingsViewController is not accessible from within the Nib. 'File Owner' represents the root view controller, not the SettingsViewController. How do I access my UINavigationController subclass from within my root view controllers Nib? Thanks in advance.

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‘Publish…’ Resulting in Directory With No Files

- by ToStringTheory

I was pulling my hair out with this one… Which isn’t good considering I have so little of it left! I had just upgraded to the Windows Azure 1.7 SDK the day before with no problems, and used the upgraded ‘Publish…’ dialog to successfully publish a website to my hard disk for hosting on an internal development server. However, when trying to deploy another project to my file system, it said it was successful, but there were no files in the directory. The only difference, the first project was an Azure project, the second was a standard ASP.Net Web Application. If you installed the Windows Azure 1.7 SDK, you may want to read this. The Problem At first it appears that there is no problem: However you may remember that when publishing a web application, the output window will generally iterate through each of the directories as it copies the files from that directory over. Sure enough, when looking at the output directory – there are no files, no bin directory, no nothing… Troubleshooting Since one site published and the other did not, I believed that the failure may have been to a failed SQL Server 2012 installation that happened between publish. I rolled back the installation, however that did not work either. I also checked the Configuration Manager dialog, and ensured that the projects were selected to actually build (just checking, even though the output said it built them..) I checked the properties of the solution and the projects, and a selection of files in the project to make sure that they were selected for content… Nothing seemed to work. I then decided to uninstall the Azure 1.7 SDK to see if that was the culprit. When I opened the Windows 7 ‘Uninstall a Program’ dialog, I noticed that the Azure SDK came with 2 extra packages that just so happen to be in a Release Candidate state from Microsoft – ‘Microsoft Web Deploy 3.0’ and ‘Microsoft Web Publish – Visual Studio 2010’. It dawned on me that the publish dialog must not be just for Azure, since it appeared when I tried to deploy the regular web application as well. Therefore, it must have been an upgrade to the publish mechanism in Visual Studio. I uninstalled both of the programs and received my old publish dialog once again, and was able to successfully publish the solution above as I had done before. After celebrating solving the problem, I tried reinstalling the Azure package, to see if it would repair the publishing process. Even though it brought back the updated dialogs, it did not publish any files. Instead of uninstalling and retreating, I now KNEW what the cause was, and these were packages not just for Azure. I now knew a product name to search for. The Solution Sure enough, with the correct search term in Google – ‘microsoft web publish no files’, and setting the timeline to 1 week, I found what I needed - Microsoft Connect - Publish Web Application FAILS! (by Andrew Rits). I am surprised that I missed something that ended up being so simple… In the Configuration Manager, I had the following settings: This is how I had been building and debugging the solution always… However, apparently when installing the new Web Publishing package, it does things a little differently in its configuration for publishing: You see the difference? The configuration here is set to ‘x86’ instead of ‘Any CPU’. Sure enough, as soon as I switched the configuration to ‘Release – Any CPU’, the deployment built and published all of my files as I expected. Conclusion It was a small change, but apparently the new ‘Publish web application’ defaults to the x86 configuration, thereby not copying any of the project/bin files to the publish target directory. I spent forever trying things, but this small drop down eluded me until I was able to target that the dialog was actually working apparently, I just didn’t have the correct configuration. I hope that this saves you the hours of frustration and hastened hair loss that it caused me… I also hope that before Microsoft brings this publishing package out of RC status, that they change the behavior of that menu to default to the settings of the old publish menu for the first time. Happy Coding!

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