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  • RAII tutorial for c++

    - by Joe Bloggs
    Hi. I'd like to learn how to use RAII in c++. I think I know what it is, but have no idea how to implement it in my programs. A quick google search did not show any nice tutorials. Does any one have any nice links to teach me RAII?

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  • HTML5 -- server side

    - by Joe Cannatti
    How much does it matter what server side language is used for building a web app to take advantage of HTML 5? It seems to me that the ruby community will probably have the fastest uptake, and as a result the most support. Does that seem right? If I want to make a serious investment in HTML5, what server side language should I use?

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  • Using JMX classes to notify on events over time

    - by Cincinnati Joe
    I've been looking at JMX for monitoring application and system metrics (partially because MBeans can accessed by various tools such as JConsole). It would seem like the classes included with JMX would be useful for things like notification when metrics have exceeded thresholds. But I'm not sure they fit with the way I want to measure these over a specified time period. For example, let's say I want to notify an admin when the average CPU load is over 95% for more than 5 minutes. Is that something can be done with a GaugeMonitor? From the docs, it doesn't seem quite suited for this, and I'm wondering if instead I should write my own MBean with the necessary logic. A more relevant example is when the login times for users exceed 10s over a period of 5 mins. Slightly different would be the last 20 logins took more than 10s on average. Another case would be when a process crashes 4+ times in an hour. Or the request queue exceeds 15 for 5 mins. Are the JMX Monitor classes useful for this kind of thing?

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  • Ambiguous Evaluation of Lambda Expression on Array

    - by Joe
    I would like to use a lambda that adds one to x if x is equal to zero. I have tried the following expressions: t = map(lambda x: x+1 if x==0 else x, numpy.array) t = map(lambda x: x==0 and x+1 or x, numpy.array) t = numpy.apply_along_axis(lambda x: x+1 if x==0 else x, 0, numpy.array) Each of these expressions returns the following error: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() My understanding of map() and numpy.apply_along_axis() was that it would take some function and apply it to each value of an array. From the error it seems that the the lambda is being evaluated as x=array, not some value in array. What am I doing wrong? I know that I could write a function to accomplish this but I want to become more familiar with the functional programming aspects of python.

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  • Web API Getting Http 500 error : Issue Solved See Below

    - by Joe Grasso
    Here is my MVC Controller and everything is fine: private UnitOfWork UOW; public InventoryController() { UOW = new UnitOfWork(); } // GET: /Inventory/ public ActionResult Index() { var products = UOW.ProductRepository.GetAll().ToList(); return View(products); } Same method call in API Controller gives me an Http 500 Error: private UnitOfWork _unitOfWork; public TestController() { _unitOfWork = new UnitOfWork(); } public IEnumerable<Product> Get() { var products = _unitOfWork.ProductRepository.GetAll().ToList(); return products; } Debugging shows that indeed there is data being returned in both controllers' UOW calls. I then added a customer configuration in Global: public static void CustomizeConfig(HttpConfiguration config) { config.Formatters.Remove(config.Formatters.XmlFormatter); var json = config.Formatters.JsonFormatter; json.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver(); } I am still receiving an Http 500 in API Controller ONLY and at a loss as to why. Any ideas? UPDATE: It appears using lazy loading caused the problem. When I set the associated properties to NON-VIRTUAL the Test API provided the necessary JSON string. However, whereas before I had the Vendor class included, I only have VendorId. I really wanted to included the associated classes. Any ideas? I know there are alot of smart people out there. Anyone?

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  • Can I redefine an XML element definition?

    - by joe
    For example, I would like to include <feetFromWater> in my <house> element. But here is the catch... I would like to keep the element name <house> and I do not want to modify the original definition. FILE: baseProperty.mod <!ELEMENT house (%size;%stories;)> <!ATTLIST house %univ-atts; outputclass CDATA #IMPLIED > FILE: beachHouse.mod (This file references baseProperty.mod) <!ELEMENT beachHouse (%size;%stories;%feetFromWater)> <!ATTLIST beachHouse %univ-atts; outputclass CDATA #IMPLIED > Is there a way to do the following without renaming from <house> to <beachHouse>?

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  • Calling CryptUIWizDigitalSign from .NET on x64

    - by Joe Kuemerle
    I am trying to digitally sign files using the CryptUIWizDigitalSign function from a .NET 2.0 application compiled to AnyCPU. The call works fine when running on x86 but fails on x64, it also works on an x64 OS when compiled to x86. Any idea on how to better marshall or call from x64? The Win32exception returned is "Error encountered during digital signing of the file ..." with a native error code of -2146762749. The relevant portion of the code are: [StructLayout(LayoutKind.Sequential)] public struct CRYPTUI_WIZ_DIGITAL_SIGN_INFO { public Int32 dwSize; public Int32 dwSubjectChoice; [MarshalAs(UnmanagedType.LPWStr)] public string pwszFileName; public Int32 dwSigningCertChoice; public IntPtr pSigningCertContext; [MarshalAs(UnmanagedType.LPWStr)] public string pwszTimestampURL; public Int32 dwAdditionalCertChoice; public IntPtr pSignExtInfo; } [DllImport("Cryptui.dll", CharSet=CharSet.Unicode, SetLastError=true)] public static extern bool CryptUIWizDigitalSign(int dwFlags, IntPtr hwndParent, string pwszWizardTitle, ref CRYPTUI_WIZ_DIGITAL_SIGN_INFO pDigitalSignInfo, ref IntPtr ppSignContext); CRYPTUI_WIZ_DIGITAL_SIGN_INFO digitalSignInfo = new CRYPTUI_WIZ_DIGITAL_SIGN_INFO(); digitalSignInfo = new CRYPTUI_WIZ_DIGITAL_SIGN_INFO(); digitalSignInfo.dwSize = Marshal.SizeOf(digitalSignInfo); digitalSignInfo.dwSubjectChoice = 1; digitalSignInfo.dwSigningCertChoice = 1; digitalSignInfo.pSigningCertContext = pSigningCertContext; digitalSignInfo.pwszTimestampURL = timestampUrl; digitalSignInfo.dwAdditionalCertChoice = 0; digitalSignInfo.pSignExtInfo = IntPtr.Zero; digitalSignInfo.pwszFileName = filepath; CryptUIWizDigitalSign(1, IntPtr.Zero, null, ref digitalSignInfo, ref pSignContext)); And here is how the SigningCertContext is retrieved (minus various error handling) public IntPtr GetCertContext(String pfxfilename, String pswd) IntPtr hMemStore = IntPtr.Zero; IntPtr hCertCntxt = IntPtr.Zero; IntPtr pProvInfo = IntPtr.Zero; uint provinfosize = 0; try { byte[] pfxdata = PfxUtility.GetFileBytes(pfxfilename); CRYPT_DATA_BLOB ppfx = new CRYPT_DATA_BLOB(); ppfx.cbData = pfxdata.Length; ppfx.pbData = Marshal.AllocHGlobal(pfxdata.Length); Marshal.Copy(pfxdata, 0, ppfx.pbData, pfxdata.Length); hMemStore = Win32.PFXImportCertStore(ref ppfx, pswd, CRYPT_USER_KEYSET); pswd = null; if (hMemStore != IntPtr.Zero) { Marshal.FreeHGlobal(ppfx.pbData); while ((hCertCntxt = Win32.CertEnumCertificatesInStore(hMemStore, hCertCntxt)) != IntPtr.Zero) { if (Win32.CertGetCertificateContextProperty(hCertCntxt, CERT_KEY_PROV_INFO_PROP_ID, IntPtr.Zero, ref provinfosize)) pProvInfo = Marshal.AllocHGlobal((int)provinfosize); else continue; if (Win32.CertGetCertificateContextProperty(hCertCntxt, CERT_KEY_PROV_INFO_PROP_ID, pProvInfo, ref provinfosize)) break; } } finally { if (pProvInfo != IntPtr.Zero) Marshal.FreeHGlobal(pProvInfo); if (hMemStore != IntPtr.Zero) Win32.CertCloseStore(hMemStore, 0); } return hCertCntxt; }

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  • mocking static method call to c# library class

    - by Joe
    This seems like an easy enough issue but I can't seem to find the keywords to effect my searches. I'm trying to unit test by mocking out all objects within this method call. I am able to do so to all of my own creations except for this one: public void MyFunc(MyVarClass myVar) { Image picture; ... picture = Image.FromStream(new MemoryStream(myVar.ImageStream)); ... } FromStream is a static call from the Image class (part of c#). So how can I refactor my code to mock this out because I really don't want to provide a image stream to the unit test.

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  • Can I place AdSense ads on a site with drug content?

    - by Joe Majewski
    I am going to be opening a new WordPress blog today, and I was curious to know if my site will be appropriate for AdSense ads. First off, the blog is going to be about drug addiction. More specifically, opiate addiction. I myself was addicted to pain killers for three years, and I am pleased to say that I am now in treatment and I have not used in over a month now. :) Anyways, my site will be an informative blog about opiates and the harm that they can induce on one's life. It will in no way endorse the use of drugs, but I may talk about my negative experiences. It will be 100% (without a doubt) evident upon checking out my website that my view on drugs is negative. Two questions: (1) Is this content acceptable for Google's terms of service? (2) In order to begin displaying AdSense ads, is there anything I must first do? I already have AdSense ads running on one of my domains. Can I simply begin pasting the code snippets into my new domain and watch as the ads begin to work? Thanks for your time. :)

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  • ModalPopupExtender doesn't work on IE6 frame layout

    - by Joe
    I'm using a "frame" layout similar to the one in this excellent answer: a div #top at the top of the page, a div#left on the left, and a div #main with the main content. The #top and #left divs contain navigation menus. Now I want to use a popup div using the AjaxControlToolkit ModalPopupExtender inside the content (#main) div. This works fine on IE8 (where #top, #left, #main all have position:fixed), but when I run it on IE6, the modal background only covers the #main div - I need it to cover the whole of the page including the #top and #left navigation divs. Looking at the script for ModalPopupExtender, it appears to be searching up the parent hierarchy until it finds a parent with position relative or absolute. And in the IE6 rendering, the #main div has position:absolute because position:fixed is not supported, which I guess explains what is happening. Any suggestions for the best/easiest way to get this working properly on IE6? Ideally without modifying the ModalPopupExtender code, but I'll do this if I have to and it's the best solution.

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  • MPMediaickerController memory leak identified by Leaks instrument

    - by Joe
    This is code from Apple's Addmusic example. MPMediaPickerController *picker = [[MPMediaPickerController alloc] initWithMediaTypes: MPMediaTypeMusic]; picker.delegate = self; picker.allowsPickingMultipleItems = YES; picker.prompt = NSLocalizedString (@"Add songs to play", "Prompt in media item picker"); // The media item picker uses the default UI style, so it needs a default-style // status bar to match it visually [[UIApplication sharedApplication] setStatusBarStyle: UIStatusBarStyleDefault animated: YES]; [self presentModalViewController: picker animated: YES]; [picker release]; I'm using this code in my app and the Leaks instrument highlights a leak on the line: [self presentModalViewController: picker animated: YES]; I think that this is because this line retains a reference to picker which cannot be subsequently released. Is there any way around this or is Leaks incorrectly identifying a leak?

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  • Linq order by aggregate in the select { }

    - by Joe Pitz
    Here is one I am working on: var fStep = from insp in sq.Inspections where insp.TestTimeStamp > dStartTime && insp.TestTimeStamp < dEndTime && insp.Model == "EP" && insp.TestResults != "P" group insp by new { insp.TestResults, insp.FailStep } into grp select new { FailedCount = (grp.Key.TestResults == "F" ? grp.Count() : 0), CancelCount = (grp.Key.TestResults == "C" ? grp.Count() : 0), grp.Key.TestResults, grp.Key.FailStep, PercentFailed = Convert.ToDecimal(1.0 * grp.Count() /tcount*100) } ; I would like to orderby one or more of the fields in the select projection.

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  • Why does an authorized OAuth request token need to be exchanged for an access token?

    - by Joe Shaw
    I'm wondering what the reasons are for OAuth to require a round-trip to the data provider to exchange an authorized request token for an access token. My understanding of the OAuth workflow is: Requesting site (consumer) gets a request token from the data provider site (service provider). Requesting site asks the data provider site to authenticate the user, passing in a callback. Once the user has been authenticated and authorized the requesting site, the user is directed back to the requesting site (consumer) via the callback provided which passes back the now-authorized request token and a verification code. The requesting site exchanges the request token for an access token. The requesting site uses the access token to get data from the data provider site. Assuming I got that right, why couldn't the callback simply provide the access token to the requesting site directly in step 3, eliminating step 4? Why is the request to exchange the request token for the access token necessary? Does it exist solely for consumers that require users to enter the verification code manually, with the thought that it would be shorter and simpler than the access token itself?

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  • JavaScript Trigger window.open When a User Clicks Anywhere on Page

    - by Joe Hammonds
    I have a problem that I have been trying to figure out and haven't been able to get past it because Chrome/FireFox/IE do not publicly publish their "rules" for pop up blocking when it comes to JavaScript, Flash, etc. I am trying to trigger a window.open() when a user clicks anywhere on page. I've tried this: document.onclick = window.open("http://msn.com"); But all 3 browsers are blocking the popup, even though it is a user interaction.

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  • Howto: Access a second related model in a nested attribute builder block

    - by Joe Cairns
    I have a basic has_many through relationship: class Foo < ActiveRecord::Base has_many :bars, :dependent => :destroy has_many :wtfs :through => :bars accepts_nested_attributes_for :bars, :wtfs end On my crud forms I have a builder block for the wtf, but I need the label to come from the bar (an attribute called label for instance). What's the proper method to do this? Here's the most simple scaffold: <h1>New foo</h1> <% form_for(@foo) do |f| %> <%= f.error_messages %> <p> <%= f.label :name %><br /> <%= f.text_field :name %> </p> <h2>Bars</h2> <% f.fields_for :wtfs do |builder| %> <%= builder.hidden_field :bar_id %> <p> <%= builder.text_field :wtf_data_i_need_to_set %> </p> <% end %> <p> <%= f.submit 'Create' %> </p> <% end %> <%= link_to 'Back', foos_path %>

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  • JPA query many to one association

    - by Random Joe
    I want to build the following pseudo query Select a From APDU a where a.group.id= :id group is a field in APDU class of the type APDUGroup.class. I just want to get a list of APDUs based on APDUGroup's id. How do i do that using a standard JPA query?

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  • Is locking on the requested object a bad idea?

    - by Quick Joe Smith
    Most advice on thread safety involves some variation of the following pattern: public class Thing { private static readonly object padlock = new object(); private string stuff, andNonsense; public string Stuff { get { lock (Thing.padlock) { if (this.stuff == null) this.stuff = "Threadsafe!"; } return this.stuff; } } public string AndNonsense { get { lock (Thing.padlock) { if (this.andNonsense == null) this.andNonsense = "Also threadsafe!"; } return this.andNonsense; } } // Rest of class... } In cases where the get operations are expensive and unrelated, a single locking object is unsuitable because a call to Stuff would block all calls to AndNonsense, degrading performance. And rather than create a lock object for each call, wouldn't it be better to acquire the lock on the member itself (assuming it is not something that implements SyncRoot or somesuch for that purpose? For example: public string Stuff { get { lock (this.stuff) { // Pretend that this is a very expensive operation. if (this.stuff == null) this.stuff = "Still threadsafe and good?"; } return this.stuff; } } Strangely, I have never seen this approach recommended or warned against. Am I missing something obvious?

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  • c# convert file from one format to another

    - by JOE SKEET
    i have a bunch of files that need to be converted. the beginning files look like this: Well ID,Error code,Sample Barcode A1,0,THC_CAL1 B1,0,THC_CAL2 C1,1,THC_CAL3 D1,0,THC_CAL4 E1,0,THC_QC1 F1,0,THC_QC2 G1,0,THC_QC3 H1,0,THC_QC4 A2,0,BLANK0609 B2,0,AA178121 C2,0,CC37815 D2,0,BLANK0610 E2,0,CC37819 F2,0,N150680 G2,0,BLANK0611 H2,0,AA127900 A3,0,AA26940 B3,0,BLANK0612 ........... the output needs to look like this: A01 THC_CAL1 B01 THC_CAL2 D01 THC_CAL4 //please note that c1 is gone since it did not have a 0 in the middle column E01 THC_QC1 F01 THC_QC2 G01 THC_QC3 H01 THC_QC4 A02 BLANK0609 B02 AA178121 C02 CC37815 D02 BLANK0610 E02 CC37819 F02 N150680 G02 BLANK0611 H02 AA127900 A03 AA26940 B03 BLANK0612 H10 BLANK0234 //please notice that there is H10 and not H010 what would be the best way to read this file into a variable and then output this into a new file? should i read it line by line or should i read it into a datatable?

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  • cURL cookie negative cookie expire

    - by Joe Doe
    I have problems with cookies with cURL. After problems I turned on verbose function and figured out cURL sets them negative expire date even if server sends positive date. Example: * Added cookie _c_sess=""test"" for domain test.com, path /, expire -1630024962 < Set-Cookie: _c_sess="test"; Domain=test.com; HttpOnly; expires=Mon, 26-Mar-2012 14:52:47 GMT; Max-Age=1332773567; Path=/ As you can see both expires and max-age are positive, but cURL sets expire to negative value. Somebody has idea? EDIT: Here is php code I use. $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, "http://site.com/"); curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1; rv:11.0) Gecko/20100101 Firefox/11.0'); curl_setopt($ch, CURLOPT_COOKIEJAR, $cookiepath); curl_setopt($ch, CURLOPT_COOKIEFILE, $cookiepath); curl_setopt($ch, CURLOPT_HEADER ,1); curl_setopt($ch, CURLOPT_VERBOSE ,1); curl_setopt($ch, CURLOPT_STDERR ,$f); curl_setopt($ch, CURLOPT_RETURNTRANSFER ,1); curl_setopt($ch, CURLOPT_FOLLOWLOCATION ,1); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); $data = curl_exec($ch); Data from cookie jar: #HttpOnly_.test.com TRUE / FALSE -1630016318 _test_sess "test"

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  • Simplifying loop in Objective-C

    - by Joe Habadas
    I have this enormous loop in my code (not by choice), because I can't seem to make it work any other way. If there's some way make this simple as opposed to me repeating it +20 times that would be great, thanks. for (NSUInteger i = 0; i < 20; i++) { if (a[0] == 0xFF || b[i] == a[0]) { c[0] = b[i]; if (d[0] == 0xFF) { d[0] = c[0]; } ... below repeats +18 more times with [i+2,3,4,etc] ... if (a[1] == 0xFF || b[i + 1] == a[1]) { c[1] = b[i + 1]; if (d[1] == 0xFF) { d[1] = c[1]; } ... when it reaches the last one it calls a method ... [self doSomething]; continue; i += 19; ... then } repeats +19 times (to close things)... } } } I've tried almost every possible combo of things that I know of attempting to make this smaller and efficient. Take a look at my flow chart — pretty huh? i'm not a madman, honest.

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