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  • I'm capturing keys on my WinForm but I'm trying to see if the pressed key is a 'String' - getting an

    - by Sergio Tapia
    Here's my code: void gkh_KeyDown(object sender, KeyEventArgs e) { if (e.KeyCode == neededLetter as Keys) { if (neededLetter == "n") { neededLetter = "o"; } else if (neededLetter == "o") { neededLetter = "t"; } else if (neededLetter == "t") { neededLetter = "e"; } else if (neededLetter == "e") { this.Show(); } } else { neededLetter = "n"; } } I'm getting an error on the first If block: The as operator must be used with a reference type or nullable type

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  • Does @JoinTable has a property of "table" or not?

    - by Kent Chen
    The following is copied from hibernate's document. (http://docs.jboss.org/hibernate/stable/annotations/reference/en/html_single/#d0e2770) @CollectionOfElements @JoinTable( table=@Table(name="BoyFavoriteNumbers"), joinColumns = @JoinColumn(name="BoyId") ) @Column(name="favoriteNumber", nullable=false) However, when I put this in practice, I just found that @JoinTable has no "table" property, instead it has a "name" property to specify the table name. But I need "table" property to specify indexes. What's going on here? I'm almost driven crazy!

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  • When does an asio timer go out of scope?

    - by ApplePieIsGood
    What I mean is, let's say you do an async_wait on an asio timer and bind the update to a function that takes a reference to a type T. Let's say you created the T initially on the stack before passing it to async_wait. At the end of that async_wait, it calls async_wait itself, renewing the timer over and over. Does that stack allocated type T stay alive until the first time the timer doesn't renew itself, or after the first invocation of the function will the T go out of scope?

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  • IE only jQuery bug

    - by Greg-J
    jsbin for reference: http://jsbin.com/edago3/5/ When viewed in any other browser, the toggler works as you would expect it to. However, in IE (I'm using 8), you can only contract the currently expanded sub menu, and then you get undesired results once it is closed.

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  • validate hostname string in Python

    - by kostmo
    Following up to Regular expression to match hostname or IP Address? and using Restrictions on valid host names as a reference, what is the most readable, concise way to match/validate a hostname/fqdn (fully qualified domain name) in Python? I've answered with my attempt below, improvements welcome.

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  • Winforms: calling entry form function from a different class

    - by samy
    I'm kinda new to programming and got a question on what is a good practice. I created a class that represents a ball and it has a function Jump() that use 2 timers and get the ball up and down. I know that in Winforms you got to call Invalidate() every time you want to repaint the screen, or part of it. I didn't find a good way to do that, so I reference the form in my class, and called Invalidate() inside my ball class every time I need to repaint to ball movement. (this works but I got a feeling that this is not a good practice) Here is the class I created: public class Ball { public Form1 parent;//----> here is the reference to the form public Rectangle ball; Size size; public Point p; Timer timerBallGoUp = new Timer(); Timer timerBallGDown = new Timer(); public int ballY; public Ball(Size _size, Point _p) { size = _size; p = _p; ball = new Rectangle(p, size); } public void Jump() { ballY = p.Y; timerBallGDown.Elapsed += ballGoDown; timerBallGDown.Interval = 50; timerBallGoUp.Elapsed += ballGoUp; timerBallGoUp.Interval = 50; timerBallGoUp.Start(); } private void ballGoUp(object obj,ElapsedEventArgs e) { p.Y++; ball.Location = new Point(ball.Location.X, p.Y); if (p.Y >= ballY + 50) { timerBallGoUp.Stop(); timerBallGDown.Start(); } parent.Invalidate(); // here i call parent.Invalidate() 1 } private void ballGoDown(object obj, ElapsedEventArgs e) { p.Y--; ball.Location = new Point(ball.Location.X, p.Y); if (p.Y <= ballY) { timerBallGDown.Stop(); timerBallGoUp.Start(); } parent.Invalidate(); // here i call parent.Invalidate() 2 } } I'm wondring if there is a better way to do that? (sorry for my english)

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  • Use msbuild community tasks without installing

    - by mickyjtwin
    In our developer environment, no users have administration rights. As such, it's not possible to install MSBuild.CommunityTasks without getting admin to do so. What I'm wondering is similar to NAnt, i.e. is it possible to include the files in your solution directory, and just reference it from there? This way, will not matter if the person has it installed, when they checkout latest code, the msbuild community files will come with, and solution will build. \SolutionDir\{solution}.sln \SolutionDir\Project\{files} \SolutionDir\MSBuild.Community\files

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  • Function lfit in numerical recipes, providing a test function

    - by Simon Walker
    Hi I am trying to fit collected data to a polynomial equation and I found the lfit function from Numerical Recipes. I only have access to the second edition, so am using that. I have read about the lfit function and its parameters, one of which is a function pointer, given in the documentation as void (*funcs)(float, float [], int)) with the help The user supplies a routine funcs(x,afunc,ma) that returns the ma basis functions evaluated at x = x in the array afunc[1..ma]. I am struggling to understand how this lfit function works. An example function I found is given below: void fpoly(float x, float p[], int np) /*Fitting routine for a polynomial of degree np-1, with coe?cients in the array p[1..np].*/ { int j; p[1]=1.0; for (j=2;j<=np;j++) p[j]=p[j-1]*x; } When I run through the source code for the lfit function in gdb I can see no reference to the funcs pointer. When I try and fit a simple data set with the function, I get the following error message. Numerical Recipes run-time error... gaussj: Singular Matrix ...now exiting to system... Clearly somehow a matrix is getting defined with all zeroes. I am going to involve this function fitting in a large loop so using another language is not really an option. Hence why I am planning on using C/C++. For reference, the test program is given here: int main() { float x[5] = {0., 0., 1., 2., 3.}; float y[5] = {0., 0., 1.2, 3.9, 7.5}; float sig[5] = {1., 1., 1., 1., 1.}; int ndat = 4; int ma = 4; /* parameters in equation */ float a[5] = {1, 1, 1, 0.1, 1.5}; int ia[5] = {1, 1, 1, 1, 1}; float **covar = matrix(1, ma, 1, ma); float chisq = 0; lfit(x,y,sig,ndat,a,ia,ma,covar,&chisq,fpoly); printf("%f\n", chisq); free_matrix(covar, 1, ma, 1, ma); return 0; } Also confusing the issue, all the Numerical Recipes functions are 1 array-indexed so if anyone has corrections to my array declarations let me know also! Cheers

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  • DataGridView checkbox column - value and functionality

    - by nav
    Here is a reference the old SO question. http://stackoverflow.com/questions/1237829/datagridview-checkbox-column-value-and-functionality/1395215#1395215 I need to know, how would I get the information from a specific cell, so that i may further make the crystal report of the checked rows of datagridview. Thanks. -nav

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  • Android: What is a difference between 'orientation' and 'screenLayout'?

    - by alex2k8
    There are 2 different constants that have same description (http://developer.android.com/intl/de/reference/android/R.attr.html#configChanges) orientation 0x0080 The screen orientation has changed, that is the user has rotated the device. screenLayout 0x0100 The screen orientation has changed, that is the user has rotated the device. Many sources suggest to specify: android:configChanges="keyboardHidden|orientation" But should not it be: android:configChanges="keyboardHidden|orientation|screenLayout"

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  • How does the setup bootstrapper detect if prerequisites are installed?

    - by Marek
    Trying to solve this problem. I would like to learn how the bootstrapper detects if prerequisites (specifically .NET 3.5) are installed. According to this reference, a way to detect if .NET is installed is to check the following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.5 Using process monitor, I have inspected registry queries done by the bootstrapper (setup.exe) and it did not show any access to this registry key. Does anybody know how the bootstrapper determines whether the prerequisites are installed on the target system?

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  • How do I get the URLs from any tab in any open browser

    - by Kasper
    I am trying to detect which web in sharepoint that the user is looking at right now. One approach could be to read the URls from the browser and try to compare them to a reference URL to the sharepoint solution. I have not yet been able to locate any solution that works in both IE and Firefox. The idea is to write a small C# app that will harvest the URLs and do the comparing. TIA

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  • Compiling LaTex bib source

    - by Klaus
    Hi I am writing my thesis in Latex, and I have the references in an own thesis.bib file which look as follows @Article{xxx, author = "D.A. Reinhard", title = "Case Study", year = "1985", } and I reference them in my main document as ~\cite{xxx} When I compile then the main document with: pdflatex main.tex than it shows me question marks instead of the proper references to the bibliography. Do I also need to compile the bib source on its own? If yes, can somebody please tell me the command for Linux Many thanks!

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  • XPathNavigator in Silverlight

    - by vladimir
    I have a code library that makes heavy use of XPathNavigator to parse some specific xml document. The xml document is cross-referenced, meaning that an element can reference another which has not yet been encountered during parsing: <ElementA ...> <DependentElementX id="1234"> </ElementA> <ElementX id="1234" .../> The document doesn't really look like this, but the point is that 1) there is an xml schema that enforces the overall document structure, 2) elements inside the document can reference each other using some IDs, and 3) there is quite a few such cross references between different elements in the document. The document is parsed in two phases. In the first pass I walk through the document XPathDocument doc = ...; XPathNavigator nav = doc.CreateNavigator(); nav.MoveToRoot(); nav.MoveToFirstChild()... and occasionally 'bookmark' the current position (element) in the document using XPathNavigator.Clone() method. This gives me a lightweight instance of an XPathNavigator which I can store somewhere and use later to jump back to a particular place (element) in my document. Once I have enough information collected in the first pass (for example, I have made sure there is indeed an ElementX with an id='1234'), I jump back to saved bookmarks (using those saved XPathNavigators) and complete the parsing. Well, now I'm about to use this library in Silverlight 3.0 and to my horror the XPathNavigator is not in the System.Xml assembly. Questions: 1) Am I missing something obvious (i.e. XPathNavigator does exist in some shape or form, for example in a toolkit or a freeware library)? 2) If I do have to make modifications in the code, what would be the best way to go? Ideally, I would like to make minimal changes, not to rewrite 80% of the code just to be able to use something like XLinq. To resume, in case I have to give up XPathNavigator, all I need is a way to bookmark places in my document and to get back to them so that I can continue to iterate from where I left off. Thanks in advance for any help/ideas.

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  • How to store user settings(username,password) in a windows application for the current login user

    - by amexn
    Now my team working in a project using windows application(c#). The application have a option for saving the username & password in the client machine for the current login user.so the user can start the application without entering username & password.I didn't have any knowledge in the windows application.Please check the snapshot of my requirement. Please suggest good example/reference.

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  • FIndcontrol doesn't seem to work inside a baseclass....

    - by Pandiya Chendur
    I use LinkButton linkBtn = (LinkButton)FindControl(ControlID); inside a method in my baseclass... This works within a normal aspx page when given, LinkButton linkBtn = (LinkButton)FindControl("lnkBtn1"); But when it is a contentpage included within a masterpage it doesn't work... LinkButton linkBtn = (LinkButton)FindControl("ctl00_ContentPlaceHolder1_lnkbtn"); i get the error Object reference not set to an instance of an object.

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  • AspNetHostingPermission set to Load User Profile

    - by IP
    Very quick question, does anyone know what the effect of setting an application pool in IIS7 o "Load User Profile" would have? Is it advisable etc. Reference: http://dbvt.com/blog/post/AspNetHostingPermission-Security-Exception-Fix-with-Ajax-in-IIS7.aspx

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  • Private WCF Web Service

    - by Bram
    I'm kind of a newb to WCF Web Services and have created a service. Here is what I'm after: If someone vists http://somesite.com/Poo.svc they are rejected straight off the bat (404 or something) Only I can add a reference to the service in VS. What I'm after is making the WCF service totally private. Any ideas?

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  • How to digitally sign soap request using visual studio 2008

    - by liz deasy
    I'm using a web reference generated from a .wsdl file. I've also examined the Amazon web service example but couldn't get it working. Enclosed is an example of the soap request. Thanking You MIIEZzCcA9cgwaABQfd86afd2g... Algorithm="http://www.w3.org/2001/10/xml-enc-c14n#"/ http://www.w3.org/2000/09/xmldsig#rsa-sha1"/ DJbchm5gk... LyLsF0pi4wPu...

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  • iphone, get the object count without performing a fetch?

    - by Andrew
    Hi, I seem to recall that it's possible to return the resulting object count from an NSPredicate in CoreData without actually performing a fetch, but I can't find any reference to this. Can someone confirm that I wasn't dreaming (sad dream to have!), and would this be safe to do in another thread? Thanks Andy

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