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  • [ruby] Check if file is a valid image

    - by some guy
    Hi all, I'm using rmagick to manipulate image files. I use the ImageList.new on each file to get started. When I apply this method to an invalid image file I get the below error which interrupts the execution of the script: RMagick.rb:1635:in `read': Improper image header (Magick::ImageMagickError) Therefore I would like to be able to check whether a file is a valid image file before using this method. Any ideas? Thanks.

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  • What is the cost of object creating.

    - by Tony
    Hi If I have to choose between static method and creating an instance and use instance method, I will choose static methods always. but what is the detailed overhead of creating an instance? for example I saw a DAL which can be done with static classes but they choose to make it instance now in the BLL at every single call they call something like. new Customer().GetData(); how far this can be bad? Thanks

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  • More trivia than really important: Why no new() constraint on Activator.CreateInstance<T>() ?

    - by flq
    I think there are people who may be able to answer this, this is a question out of curiosity: The generic CreateInstance method from System.Activator, introduced in .NET v2 has no type constraints on the generic argument but does require a default constructor on the activated type, otherwise a MissingMethodException is thrown. To me it seems obvious that this method should have a type constraint like Activator.CreateInstance<T>() where T : new() { ... } Just an omission or some anecdote lurking here?

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  • How can the AssemblyName class be used for existing Assemblies?

    - by IbrarMumtaz
    This is another exam related question. I want to know how can I use the AssemblyName class to represent an existing assembly that already exists on disk??? I am talking about from the perspective of using the AppDomain's instance method .Load(), that takes an AssemblyName object as a parameter. I know what MSDN has to say about what the .Load() method was designed for but that aside, I still want to know how to use it !!!

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  • Collision Detection for arbitrarily sized, positioned and rotated rectangles in XNA

    - by Stefan
    I'm working with xna in C# and in my game I will have a variety of space ships flying all over the place. They will each have an arbitrary rotation, size and position in space and I need a method to determine when they collide. Ideally the method would take two Rectangles, two doubles and two Vector2s for size, rotation and position respectively and return a boolean that indicates whether they have intersected or not.

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  • When mocking a class with Moq, how can I CallBase for just specific methods?

    - by Daryn
    I really appreciate Moq's Loose mocking behaviour that returns default values when no expectations are set. It's convenient and saves me code, and it also acts as a safety measure: dependencies won't get unintentionally called during the unit test (as long as they are virtual). However, I'm confused about how to keep these benefits when the method under test happens to be virtual. In this case I do want to call the real code for that one method, while still having the rest of the class loosely mocked. All I have found in my searching is that I could set mock.CallBase = true to ensure that the method gets called. However, that affects the whole class. I don't want to do that because it puts me in a dilemma about all the other properties and methods in the class that hide call dependencies: if CallBase is true then I have to either Setup stubs for all of the properties and methods that hide dependencies -- Even though my test doesn't think it needs to care about those dependencies, or Hope that I don't forget to Setup any stubs (and that no new dependencies get added to the code in the future) -- Risk unit tests hitting a real dependency. Q: With Moq, is there any way to test a virtual method, when I mocked the class to stub just a few dependencies? I.e. Without resorting to CallBase=true and having to stub all of the dependencies? Example code to illustrate (uses MSTest, InternalsVisibleTo DynamicProxyGenAssembly2) In the following example, TestNonVirtualMethod passes, but TestVirtualMethod fails - returns null. public class Foo { public string NonVirtualMethod() { return GetDependencyA(); } public virtual string VirtualMethod() { return GetDependencyA();} internal virtual string GetDependencyA() { return "! Hit REAL Dependency A !"; } // [... Possibly many other dependencies ...] internal virtual string GetDependencyN() { return "! Hit REAL Dependency N !"; } } [TestClass] public class UnitTest1 { [TestMethod] public void TestNonVirtualMethod() { var mockFoo = new Mock<Foo>(); mockFoo.Setup(m => m.GetDependencyA()).Returns(expectedResultString); string result = mockFoo.Object.NonVirtualMethod(); Assert.AreEqual(expectedResultString, result); } [TestMethod] public void TestVirtualMethod() // Fails { var mockFoo = new Mock<Foo>(); mockFoo.Setup(m => m.GetDependencyA()).Returns(expectedResultString); // (I don't want to setup GetDependencyB ... GetDependencyN here) string result = mockFoo.Object.VirtualMethod(); Assert.AreEqual(expectedResultString, result); } string expectedResultString = "Hit mock dependency A - OK"; }

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  • Does any body see a reson in DesignForExtension Check in Checkstyle?

    - by Roman Ivanov
    Check: http://checkstyle.sourceforge.net/config_design.html#DesignForExtension False positives: Checkstyle "Method Not Designed For Extension" error being incorrectly issued? checkstyle Method is not designed for extension - needs to be abstract, final or empty https://sourceforge.net/p/checkstyle/bugs/688/ Look like all switch that Check off in their configurations. Does anybody could show real code example where this Check is useful ? and good for developers.

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  • Building a balanced binary search tree

    - by Znarkus
    Hi! Is there a method to build a balanced binary search tree? Example: 1 2 3 4 5 6 7 8 9 5 / \ 3 etc / \ 2 4 / 1 I'm thinking there is a method to do this, without using the more complex self-balancing trees. Otherwise I can do it on my own, but someone probably have done this already :)

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  • Why GUID is returned as empty?

    - by jess
    Hi, After loading an entity from the database using LINQ-to_SQL,I pass the entity.ID to a method having argument of type GUID.When I access this parameter in the method,I get an empty value,and not the GUID.Why is it so?

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  • Silverlight 4 and Youtube flash player

    - by user347903
    hi I'm trying to make a small silverlight application but i became across a problem, playing videos from youtube. I tried a method with a html conteiner to embed the youtube flash player, but with this method i need to activate the option windowsless, and thats is not a good ideia for my web site. If anyone have a good ideia,I'm glad to hear thanks BasicSide

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  • Function Overloading

    - by Sanju
    Let us suppose i have these three methods defined: int F1(int, int); int F1(float, float); Float F1(int, int); and i am calling method F1 here: Console.writeline(F1(5,6).ToString())); Which method it will call and why?

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  • FolderBrowseDialog Silverlight

    - by scrat789
    I have an silverlight 4 application, and I want to upload recursively a local folder on the server. For upload files separatly, there is OpenFileDialog method, But I can not select a folder path. Does exist an equivalent of the WPF "FolderBrowseDialog" method in silverlight ?

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  • color code in X/HTML , CSS..

    - by jitendra
    In how many ways we can give color info in X/HTML, css? I know some Hex color name rgba is there any other method? and which method is preferred to use and which not? Please give explanation. And what is the means of web-safe colors?

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  • [PHP] How to pass array as multiple parameters to function?

    - by vbklv
    I have a parameters array: $params[1] = 'param1'; $params[2] = 'param2'; $params[3] = 'param3'; ... $params[N] = 'paramN'; I have a caller to various functions: $method->$function( $params ); How can I parse the $params array, so multiple (and unlimited) parameters can be passed to any function: $method->$function( $param[1], $param[2], ..., $param[N] );

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  • How to modify raw HTML of ASP.NET page on PreRender?

    - by ace
    I want to access the raw HTML code that my ASP.NET System.Web.UI.Page is about to render. How can i do that? Is there a property or method like System.Web.UI.Page.HTML or something like that. I know I could loop through the Controls List of the page and get access to all the Literal Controls etc, but I was wondering if there's a direct property or method that can return me the raw html, which I can modify just before rendering the page.

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  • Vector iterators in for loops, return statements, warning, c++

    - by Crystal
    Had 3 questions regarding a hw assignment for C++. The goal was to create a simple palindrome method. Here is my template for that: #ifndef PALINDROME_H #define PALINDROME_H #include <vector> #include <iostream> #include <cmath> template <class T> static bool palindrome(const std::vector<T> &input) { std::vector<T>::const_iterator it = input.begin(); std::vector<T>::const_reverse_iterator rit = input.rbegin(); for (int i = 0; i < input.size()/2; i++, it++, rit++) { if (!(*it == *rit)) { return false; } } return true; } template <class T> static void showVector(const std::vector<T> &input) { for (std::vector<T>::const_iterator it = input.begin(); it != input.end(); it++) { std::cout << *it << " "; } } #endif Regarding the above code, can you have more than one iterator declared in the first part of the for loop? I tried defining both the "it" and "rit" in the palindrome() method, and I kept on getting an error about needing a "," before rit. But when I cut and paste outside the for loop, no errors from the compiler. (I'm using VS 2008). Second question, I pretty much just brain farted on this one. But is the way I have my return statements in the palindrome() method ok? In my head, I think it works like, once the *it and *rit do not equal each other, then the function returns false, and the method exits at this point. Otherwise if it goes all the way through the for loop, then it returns true at the end. I totally brain farted on how return statements work in if blocks and I tried looking up a good example in my book and I couldn't find one. Finally, I get this warnings: \palindrome.h(14) : warning C4018: '<' : signed/unsigned mismatch Now is that because I run my for loop until (i < input.size()/2) and the compiler is telling me that input can be negative? Thanks!

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  • Creating and Saving an Excel File

    - by Kris
    I have the following code that creates a new Excel file in my C# code behind. When I attempt to save the file I would like the user to select the location of the save. In Method #1, I can save the file my using the workbook SaveCopyAs without prompting the user for a location. This saves one file to the C:\Temp directory. Method #2 will save the file in my Users\Documents folder, then prompt the user to select the location and save a second copy. How can I eliminate the first copy from saving in the Users\Documents folder? Excel.Application oXL; Excel._Workbook oWB; Excel._Worksheet oSheet; Excel.Range oRng; try { //Start Excel and get Application object. oXL = new Excel.Application(); oXL.Visible = false; //Get a new workbook. oWB = (Excel._Workbook)(oXL.Workbooks.Add(Missing.Value)); oSheet = (Excel._Worksheet)oWB.ActiveSheet; // ***** oSheet.Cells[2, 6] = "Ship To:"; oSheet.get_Range("F2", "F2").Font.Bold = true; oSheet.Cells[2, 7] = sShipToName; oSheet.Cells[3, 7] = sAddress; oSheet.Cells[4, 7] = sCityStateZip; oSheet.Cells[5, 7] = sContactName; oSheet.Cells[6, 7] = sContactPhone; oSheet.Cells[9, 1] = "Shipment No:"; oSheet.get_Range("A9", "A9").Font.Bold = true; oSheet.Cells[9, 2] = sJobNumber; oSheet.Cells[9, 6] = "Courier:"; oSheet.get_Range("F9", "F9").Font.Bold = true; oSheet.Cells[9, 7] = sCarrierName; oSheet.Cells[11, 1] = "Requested Delivery Date:"; oSheet.get_Range("A11", "A11").Font.Bold = true; oSheet.Cells[11, 2] = sRequestDeliveryDate; oSheet.Cells[11, 6] = "Courier Acct No:"; oSheet.get_Range("F11", "F11").Font.Bold = true; oSheet.Cells[11, 7] = sCarrierAcctNum; // ***** Method #1 //oWB.SaveCopyAs(@"C:\Temp\" + sJobNumber +".xls"); Method #2 oXL.SaveWorkspace(sJobNumber + ".xls"); } catch (Exception theException) { String errorMessage; errorMessage = "Error: "; errorMessage = String.Concat(errorMessage, theException.Message); errorMessage = String.Concat(errorMessage, " Line: "); errorMessage = String.Concat(errorMessage, theException.Source); }

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  • Adding an inheritance to an Qt designed object

    - by Jaguar
    Hello, I have a problem and I want to implement the MVC pattern to my QT application, that's why I need for example to inherite in my QTableWidget about another class like myClass { myMethod(); } but our QTableWidget is contained by our Mainwidows that is designed by the QT designer and generate an ui_MainWindow class ! Do you know how to do that ? Is that a method inside the Qt Designer to do that ? or another method ? Thank you for your answer !

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  • What is the different purpose of .H header file and a IDL file?

    - by smwikipedia
    I am studying COM so there're some basic questions puzzling me... I know that IDL file is used to describe the method definitions (or the so called 'contract' between software modules), and the .H header files contains something like a method prototype, which looks similar to what the IDL is meant for. So, why are these two things coexist? Isn't one enough? Many thanks.

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  • document.evalute function giving exception

    - by R_Dhorawat
    i have a code like res = doc.evalute(xpathExpr,doc,function(prefix) { return namespaces[prefix] || null;}, XPathResult.ANY_TYPE,null ); here doc is DOM document node when i run for loop like this for(i in doc)alert(i); it gives evalute method but when i tried to use this method on dom node it giving me error like xpathResult not defined... i'm working in android browser thanks in advance....

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  • getJSON triggered from a button inside a form

    - by nav
    Hi, I'm having trouble understanding why I have to place the button triggering the getJSON method outside of the form for the request to work. If the button is placed within the form then the getJSON method returns no results. The code bascially makes a XHR request on clicking the Submit button, based on the value selected. I have replicated the issue here: http://jsfiddle.net/z6caj/ Many Thanks,

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