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• What does double? mean in C# ?

  - by Nikhil

  Hi, While reading the code of the NUnit project's assert class, I came across this particular construct - public static void AreEqual(double expected, double? actual, double delta) { AssertDoublesAreEqual(expected, (double)actual, delta ,null, null); } In this function the second input parameter is entered as "double?". The interesting thing is that this code compiles without issue in VS2010 (c# 4.0). Anyone know why this is NOT throwing an error ? Why is "double?" considered a valid keyword and is there any special significance to the "?".

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• Cross Platform Tips, Tricks & Gotchas

  - by codeelegance

  If you've worked on a cross platform development project: What did you learn from the experience? What worked? What didn't? What problems did you run into and how did you solve them? Did you aim for consistent appearance and functionality across all platforms or try to take advantage of each platform's strengths? What language and cross platform libraries did you use and did they live up to their claims? Was it a desktop application or web-based?

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• OpenCV 2.0 and Python

  - by Jive Dadson

  I cannot get the example Python programs to run. When executing the Python command "from opencv import cv" I get the message "ImportError: No module named _cv". There is a stale _cv.pyd in the site-packages directory, but no _cv.py anywhere. See step 5 below. MS Windows XP, VC++ 2008, Python 2.6, OpenCV 2.0 Here's what I have done. Downloaded and ran the MS Windows installer for OpenCV2.0. Downloaded and installed CMake Downloaded and installed SWIG Ran CMake. After unchecking "ENABLE_OPENMP" in the CMake GUI, I was able to build OpenCV using INSTALL.vcproj and BUILD_ALL.vcproj. I do not know what the difference is, so I built everything under both of those project files. The C example programs run fine. Copied contents of OpenCV2.0/Python2.6/lib/site-packages to my installed Python2.6/lib/site-packages directory. I notice that it contains an old _cv.pyd and an old libcv.dll.a.

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• Referencing assemblies created with ILMerge in Visual Studio projects

  - by Daniel Schaffer

  I have a solution in Visual Studio with 5 projects. They are: Foo.Core: Core functionality Foo.Api: Generated code built on top of core Foo.Web: Web-specific extensions Foo.Web.Mvc: MVC-specific extensions Newtonsoft.Json: 3rd party library I want to use ILMerge to merge Foo.Core, Foo.Api and Newtonsoft.Json into a single assembly, called Foo. That's the easy part. The problem I'm running into is that Foo.Web and Foo.Web.Mvc both need to reference all three of the merged assemblies. If I reference the original assemblies, they will have invalid references after I do the ILMerge. If I reference the ILMerged assembly, I have to reference a debug assembly and then change it before I package everything up, which doesn't seem ideal. I've tried creating a project called Foo, which references the 3 merged assemblies and replaces its own output with the ILmerged assembly, but that doesn't seem to work at all. Is there a reliable way to do this?

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• [jQuery] [PHP] Image manipulation

  - by robertdd

  hello, I want to do some kind of image editor, after I upload more images i want to make a list with all the thumbnails! after i want to be able to click on one thumb and rotate, duplicate, drag and drop (to change positions of the images), delete the image! all the images i want to be in a php array, if a image is deleted i want to delete the row from array to, if a image is drag and droped i want to change the position in the array to! ok after the user upload all the images and modify some of it how i can make a DONE button to save the positions of the images? for this small project how u suggest me to save the images? (to make a table in mysql and store the names of the images in the database depending on the session id? depending on the IP? any suggestions are welcome! thanks!

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• iPhone SDK mySQL

  - by Kevin

  Hello everybody, I'm starting on a new iPhone project, and this application mostly relies on mySQL. I have a mysql database running on my computer, and I need this application to send queries to the server to gain information. One example is creating and logging into an account. I have successfully done this on my windows vb.net application, but I know that objective c will be harder. This is basically getting text from the sql database and displaying it on the iPhone application. If someone could simply help me on that, I'll easily get started. So I hope that you guys help me out here :). Thanks Kevin

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• ASP.NET MVC2 Data Access Layer

  - by Paul

  For a small/medium sized project I'm trying to figure out what is the 'ideal' way to have a domain layer and data access layer. My opinions on coupling tend to be more towards the view that the domain models should not be tightly coupled with the database layer, in other words the data access layer shouldn't actually know anything about the domain objects. I've been looking at Linq-to-sql and it wants to use its own models that it creates, and so it ends up VERY tightly coupled. Whilst I love the way you use linq-to-sql in code I really don't like the way it wants to make its own domain objects. What are some alternatives that I should consider? I tried use NHibernate but I did not like the way I had to use to query and get different objects. I honestly love the syntax and way you use linq, I just don't want it to be so tightly coupled to domain objects.

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• Maven assembly - Error reading assemblies

  - by Laurent

  Dear all, I have defined a personalized jar-with-dependencies assembly descriptor. However, when I execute it with mvn assembly:assembly, I get : ... [INFO] META-INF/ already added, skipping [INFO] META-INF/MANIFEST.MF already added, skipping [INFO] javax/ already added, skipping [INFO] META-INF/ already added, skipping [INFO] META-INF/MANIFEST.MF already added, skipping [INFO] META-INF/maven/ already added, skipping [INFO] [assembly:assembly {execution: default-cli}] [INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Error reading assemblies: No assembly descriptors found. My jar-with-dependencies.xml is in src/main/resources/assemblies/. My assembly descriptor is the following : <?xml version='1.0' encoding='UTF-8'?> <assembly> <id>jar-with-dependencies</id> <formats> <format>jar</format> </formats> <dependencySets> <dependencySet> <scope>runtime</scope> <unpack>true</unpack> <unpackOptions> <excludes> <exclude>**/LICENSE*</exclude> <exclude>**/README*</exclude> </excludes> </unpackOptions> </dependencySet> </dependencySets> <fileSets> <fileSet> <directory>${project.build.outputDirectory}</directory> <outputDirectory>/</outputDirectory> </fileSet> <fileSet> <directory>src/main/resources/META-INF/services</directory> <outputDirectory>META-INF/services</outputDirectory> </fileSet> </fileSets> </assembly> And my project pom.xml is : <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-assembly-plugin</artifactId> <version>2.2-beta-5</version> <executions> <execution> <id>jar-with-dependencies</id> <phase>package</phase> <goals> <goal>single</goal> </goals> <configuration> <descriptors> <descriptor>jar-with-dependencies.xml</descriptor> </descriptors> <archive> <manifest> <mainClass>org.my.app.HowTo</mainClass> </manifest> </archive> </configuration> </execution> </executions> </plugin> When mvn assembly:assembly is performed, dependencies are unpacked and I get the previous error when unpack has finished. Moreover, if I execute mvn -e assembly:assembly it is say that no descriptors has been found, however it try to unpack dependencies and a JAR with dependencies is created but it doesn't contain META-INF/services/* as specified in descriptor : [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Error reading assemblies: No assembly descriptors found. [INFO] ------------------------------------------------------------------------ [INFO] Trace org.apache.maven.lifecycle.LifecycleExecutionException: Error reading assemblies: No assembly descriptors found. at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:719) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:284) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138) at org.apache.maven.cli.MavenCli.main(MavenCli.java:362) at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315) at org.codehaus.classworlds.Launcher.launch(Launcher.java:255) at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430) at org.codehaus.classworlds.Launcher.main(Launcher.java:375) Caused by: org.apache.maven.plugin.MojoExecutionException: Error reading assemblies: No assembly descriptors found. at org.apache.maven.plugin.assembly.mojos.AbstractAssemblyMojo.execute(AbstractAssemblyMojo.java:356) at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694) ... 17 more Caused by: org.apache.maven.plugin.assembly.io.AssemblyReadException: No assembly descriptors found. at org.apache.maven.plugin.assembly.io.DefaultAssemblyReader.readAssemblies(DefaultAssemblyReader.java:206) at org.apache.maven.plugin.assembly.mojos.AbstractAssemblyMojo.execute(AbstractAssemblyMojo.java:352) ... 19 more I don't see my error. Does someone has a solution ? Kind Regards Laurent

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• C# Resource Array

  - by user472875

  Hi, I have a bunch of pictures I'm using in a C# project, and I'm trying to initialize them all for later use. There are over 50 of them and they all have the same name format Properties.Resources._#, where # is the picture number. What I'm trying to do is something like: for(int i = 0; i < 100; i++) { pics[i] = Properties.Resources._i; } How would I go about embedding the index into the name? Thanks, and happy holidays. EDIT: Just realized that if I had a way to embed the index in the name, I could just have a function that returns the specific picture based on the number given, so that would work too.

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• libcurl .NET does not want to work on Win64

  - by Dmitry

  I wrote multi-threaded FTP uploader on C#.NET using libcurl.NET. Everything works fine on my machine, but when I give application (exe + libcurl.dll + 2 libcurl C# binding DLLs) to my friend who is running Win64, application crashes. After adding exception catcher to whole Main() function, I was able to get readable error message: "An attempt was made to load a program with an incorrect format (Exception from HRESULT = 0x8007000b)" After googling for a while, I found an advice to enable unmanaged code in my project settings. I've recompiled my application and LibCurlNet.dll with this flag set but it did not help. What can cause such problem?

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• How to disable localization of errors in Visual Studio?

  - by MartyIX

  I use Visual Studio 2008 and it really makes me crazy how it shows error messages (in Error List window, Output window - especially exceptions) partially in English and partially in my native language. Interestingly, it is worse in WPF than in WinForms project. I've read here that it is about Culture of the running thread (so that the problem is in a settings for .NET). Why am I solving it? It's simple because if I run into an error message and I don't know what it exactly mean or how to fix the problem then trying to google the problem in any other language than in English is very problematic. For example, it would be useful to set English for debugging purposes. How to solve the problem? Thanks for any suggestion!

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• Bash Shell; read command; using Cygwin on Windows 7

  - by user312397

  Okay so I am having this problem. I write up a script to be run in cygwin on Windows. I've tried a bunch of basic example scripts in case it was my scripts problem. So I tried this: #!/bin/bash echo -e "Enter your name and press [ENTER]: \c" read var_name echo "Your name is: $var_name" Then I will run it and I enter a name for var_name. I get this: $ ./project1.sh Enter your name and press [ENTER]: Jake ': not a valid identifierad: `var_name Your name is: So as far as I understand it I am having a problem with read. I am trying to work on a project for my class, but I can't seem to figure out why it won't read it. I followed the book with no triumph then resorted to these examples on the web that do not seem to work for me either. Does anyone have any idea if it is my setup or if I am missing something, thanks.

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• Having Problems Getting FreeTTS and JSAPI Working

  - by Travis

  I have a simple project idea based off of FreeTTS and the JSAPI (Java Speech API) I've downloaded and unpacked FreeTTS and run their build script. Then tried compiling my code linking in the lib directory into the class path like this: javac -cp /home/travis/Desktop/freetts-1.2/lib HelloUnleashedReader.java Which then compiles to java bytecode just fine. However when I run: java HelloUnleashedReader I get the following error: Exception in thread "main" java.lang.NoClassDefFoundError: javax/speech/EngineModeDesc Any help on this issue would be greatly appreciated as there are many sites around the net discussing problems with getting it to work but not many that discuss their solution.

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• AutoMapper and SecurityException in IIS

  - by Felipe

  Hi everybody... I'm developing a asp.net mvc application with nhibernate and I would not like to expose my objects mappings with NHibernate, so I created DTO for each entity and I'm trying to convert my Domain objects to DTO and send it to View. So I have in my sollution: ClassLibrary with my Domain (for NHibernate) and DTO objetcs Class library to make a SessionFactory adn Factories in my Project Asp.Net MVC 2 Application So, I download AutoMapper to transform Domain objects in DTO and add a the code to do this in Application_Start of global.asax. When I run in VisualStudio (by pressing F5) it works fine and my dtos are into the view, So when I publish this in IIS, I get a security exception =( in first line of conversion: Mapper.CreateMap(); <--- this line throw exception Mapper.CreateMap(); System.Security.SecurityException: Failed request for the permission of type 'System.Security.Permissions.ReflectionPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. What can I do to resolve this to work in IIS ? When I will publish it on web server, the error will get too :( Thanks Cheers

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• Service broker with SqlNotificationRequest

  - by user171523

  I am in the process of evaluating a Service Broker with SQL noticiation for my project. My requirements is User places a order from System A and it will update Order Table. As soon as order is place i need to notify the System B. I have done a quick POC with Trigger , Service Broker and SQLNotificaiton ADO.NET. It is working as i expected. What i would like to know the group A) What are the best practices i need to follow for this? B) What are disadvantages with the above approach if any? C) Are there any disadvantes of using the Triggers? If so what are those for above approach? The order table will get order from System A like 1000 to 1500 every day. I also would like to know the performance of above approach.

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• gcc linking shared libraries with dependent libraries

  - by Geng

  I have a complicated project with multiple executable targets and multiple shared libraries. The shared libraries currently don't have their dependent shared libraries linked in, and the result is that linker arguments to build the executables are hideously long and hard to maintain. I'd like to add in the dependencies so the Makefiles become much cleaner. I want to add the following (example): gcc -shared -o libshared.so -lshared_dependent1 -lshared_dependent2 objfile1.o objfile2.o Is there a way to test if all the symbols in libshared.so will resolve based on that line? Is there a way to print out if any of the shared_dependent libraries specified were unnecessary? Thanks in advance.

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• NoSuchPortException using RXTX Java library on Windows?

  - by Steve

  I have followed the instructions to setup rxtx on windows from http://www.jcontrol.org/download/readme_rxtx_en.html. What I did exactly was copy rxtxSerial.dll to "C:\Program Files\Java\jdk1.6.0_07\jre\bin" and copied RXTXcomm.jar to "C:\Program Files\Java\jdk1.6.0_07\jre\lib\ext" (my JAVA_HOME variable is set to C:\Program Files\Java\jdk1.6.0_07\jre) I also added RXTXcomm.jar to my eclipse project. But when I run it, it still says "NoSuchPortException" Devel Library ========================================= Native lib Version = RXTX-2.0-7pre1 Java lib Version = RXTX-2.0-7pre1 java.lang.ClassCastException: gnu.io.RXTXCommDriver cannot be cast to gnu.io.CommDriver thrown while loading gnu.io.RXTXCommDriver gnu.io.NoSuchPortException at gnu.io.CommPortIdentifier.getPortIdentifier(CommPortIdentifier.java:218) at TwoWaySerialComm.connect(TwoWaySerialComm.java:20) at TwoWaySerialComm.main(TwoWaySerialComm.java:107) In my java file, I tell it: try { (new TwoWaySerialComm()).connect("COM4"); } and I've also tried the Java Comm API. Both cannot recognize my serial port but I am sure I followed the instruction correctly. There files are there. Does anybody have any idea what it could be?

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• Access violation after GetInterface/QueryInterface in Delphi

  - by W55tKQbuRu28Q4xv

  Hi everyone! First, I'm very new in Delphi and COM, but I should build COM application in Delphi. I read a lot of articles and notes on the internets, but COM and COM in Delphi are still not clear to me. My sources - http://www.everfall.com/paste/id.php?wisdn8hyhzkt (about 80 lines). I try to make a COM Interface and Impl class - it works if I call an interface method from Delphi (I create an impl object via TestClient.Create), but if I try to create an object from outer world (from Java, via com4j) my application crashed with following exception: Project Kernel.exe raised exception class $C0000005 with message 'access violation at 0x00000002: read of address 0x00000002'. If I set a breakpoint in QueryInterface - it breaks, but when I come out from function - all crashes. What I'm doing wrong? What I still missing? What I can/should read about COM (in Delphi) to avoid dumb questions like this?

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• Spawn a background process in Ruby

  - by Dave DeLong

  I'm writing a ruby bootstrapping script for a school project, and part of this bootstrapping process is to start a couple of background processes (which are written and function properly). What I'd like to do is something along the lines of: `/path/to/daemon1 &` `/path/to/daemon2 &` `/path/to/daemon3 &` However, that blocks on the first call to execute daemon1. I've seen references to a Process.spawn method, but that seems to be a 1.9+ feature, and I'm limited to Ruby 1.8. I've also tried to execute these daemons from different threads, but I'd like my bootstrap script to be able to exit. So how can I start these background processes so that my bootstrap script doesn't block and can exit (but still have the daemons running in the background)? Thanks!

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• How to learn high-level Java web development concepts

  - by titaniumdecoy

  I have some experience writing web applications in Java for class projects. My first project used Servlets and my second, the Stripes framework. However, I feel that I am missing the greater picture of Java web development. I don't really understand the web.xml and context.xml files. I'm not sure what constitutes a Java EE application as opposed to a generic Java web application. I can't figure out how a bean is different from an ordinary Java class (POJO?) and how that differs from an Enterprise Java Bean (EJB). These are just the first few questions I could think of, but there are many more. What is a good way to learn how Java web applications function from the top down rather than simply how to develop an application with a specific framework? (Is there a book for this sort of thing?) Ultimately, I would like to understand Java web applications well enough to write my own framework.

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• UITabBar in iPad - Won't go into landscape mode with more than 2 items

  - by Sam Diaz

  I created a new project and selected the Tab Bar template for iPad. I opened it up in Interface Builder and added 4 more items, bringing the total items to 6. I did a build and run and it opened up fine in the iPad simulator, but it wouldn't go into landscape! I then backtracked in interface builder and found that it would go landscape if there were only 2 items in the tab bar, but not if there were any more. The simulator rotates but all the content (currently just the placeholders put in place by Apple) stays as if it was portrait. Any ideas why?

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• XCode and SVN Error: 200019

  - by Boiler Bill

  So, I haven't been in an XCode project on this machine since last summer, and now when I try to access the repo through SCM Configuration in preferences I get the following error: Error: 200019 (Incompatible library version) Description: Mismatched RA version for 'http': found 1.6.2, expected 1.6.5 I know at some point I updated my subversion client through MacPorts and is probably the cause of the problem. So I located all the svn programs on my path and replaced them with symlinks to the /opt/local/bin/svn client thinking that would do it (note that /usr/bin/svn --version yielded the same error message as XCode. Somehow XCode (3.2.1) is still pointing to some older 1.6.2 files. Can someone point me in the right direction on getting XCode svn integration cleaned up?

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• Reference DLLs not loading in Visual Studio 2010

  - by Adam Haile

  I'm working on a C# 4.0 project in VS2010 and needed to use some older DLLs containing controls that were created in C# 3.5 on VS2008. When I first add the DLLs to the references, I was able to see the namespace via intellisense and create an instance of one of the controls, but when I go to build, it gives me the following error: The type or namespace name 'BCA' could not be found (are you missing a using directive or an assembly reference?) And I do have a using directive for that namespace already, which is now underlined in red, showing that VS cannot find it. And now, intellisense won't pick up that namespace at all. I even tried added the controls to the toolbox (which worked) but then when I drag them to the GUI, it says that it cannot locate the DLL reference, even though it obviously knows where it is. I even tried changing the target framework to 3.5, but still with the same results. Any thoughts as to why this could be happening?

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• How to enlarge dynamically an UILabel (label and font size)?

  - by Flocked

  Hello, Im currently working on an iPhone project. I want to enlarge dynamically an UILabel in Objective-C like this: How is this possible? I thought I have to do it with CoreAnimation, but I didn't worked. Here is the code I tried: UILabel * fooL = //[…] fooL.frame = CGRectMake(fooL.frame.origin.x, fooL.frame.origin.y, fooL.frame.size.width, fooL.frame.size.height); fooL.font = [UIFont fontWithName:@"Helvetica" size:80]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; [UIView setAnimationDelegate:self]; [UIView setAnimationDuration:0.5]; [UIView setAnimationBeginsFromCurrentState:YES]; fooL.font = [UIFont fontWithName:@"Helvetica" size:144]; //bigger size fooL.frame = CGRectMake(20 , 44, 728, 167); //bigger frame [UIView commitAnimations]; The problem with this code is that it doesn't change the fontsize dynamically.

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• Excel parsing (xls) date error

  - by tau-neutrino

  I'm working on a project where I have to parse excel files for a client to extract data. An odd thing is popping up here: when I parse a date in the format of 5/9 (may 9th) in the excel sheet, I get 39577 in my program. I'm not sure if the year is encoded here (it is 2008 for these sheets). Are these dates the number of days since some sort of epoch? Does anyone know how to convert these numbers to something meaningful? I'm not looking for a solution that would convert these properly at time of parsing from the excel file (we already have thousands of extracted files that required a human to select relevant information - re-doing the extraction is not an option).

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