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• Exception handling policy in libraries

  - by Asaf R

  When building a .NET library, what's your exception handling policy? In specific, what's your policy about handling exceptions inside library calls and exposing them to calling code? Would you treat a library function as any other, thus letting all exceptions it can't handle flow out of it as-is? Would you create a custom exception for that library? Would you catch all exceptions and throw the library's exception instead? Would you set the original exception as the library's exception internal exception? How would the library dependence on a DB affect your exception-handling policy? What other guidelines and rules would you suggest?

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• Setup Padrino with DataMapper and MySQL database

  - by Ivo Sabev

  Hello I am trying to setup a Padrino project using DataMapper and MySQL on my Mac OSX Snow Leopard. I have the necessary gems: dm-core data_objects do_mysql mysql (linked to my original Mac OSX installation) But when I try to start the padrino with PADRINO START from the console, I get the following error: /Users/ivolution/.bundle/ruby/1.9.1/gems/dm-core-0.10.2/lib/dm-core/adapters/mysql_adapter.rb:3:in `require': no such file to load -- do_mysql (LoadError) But as I said I do have do_mysql gem installed so there shouldn't be such error, I did bundle install in my project folder before trying to start Padrino. Any ideas?

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• how to COPY Attribute value in a new attribute

  - by Mukesh

  How to copy data of attribute to new attribute in the same column in sql original data <root> <child attr='hello'></child> </root> Result 1 <root> <child attr='hello' attr2='hello'></child> </root> Result 2(with a modification) <root> <child attr='hello' attr2='**H**ello **W**orld'></child> </root>

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• Encrypt nsdata in iphone and decrypt it in php

  - by Gaurav Arora

  Hi All, I am new to Iphone development , I want to create an application in which I have to upload some data on php server using my Iphone application. For this I have an file on the Iphone whose content I have to upload on php server. For this I have converted the content of the file in NSData and now I want to encrypt this nsdata object and then pass it to the php server and on php server firstly I have to decrypt the nsdata object then I have to upload it on the server. But I am not able to find any way by which I can encrypt some data in Iphone app and then decrypt it in php. And also I want to compress the encrypted data before transferring it to php and then uncompress that data on php. The complete flow of my application is IPhone NSData -- Encrypted NsData -- Compressed Encrypted Data php Compressed Encrypted Data -- uncompressed encrypted data -- decrypted (original) NSData. Can some one help me how can I develop such application? Thanks in advance. Gaurav

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• Resizing JPEG image during decoding

  - by Thomas

  I'm working on a program that creates thumbnails of JPEG images on the fly. Now I was thinking: since a JPEG image is built from 8x8-pixel blocks (Wikipedia has a great explanation), would it be possible to skip part of the decoding? Let's say that my thumbnails are at least 8 times smaller than the original image. We could then map each 8x8 block in the input file to 1 pixel in the decoding output, by including only the constant term of the discrete cosine transform. Most of the image data can be discarded right away, and need not be processed. Moreover, the memory usage is reduced by a factor of 64. I don't want to implement this from scratch; that'll easily take a week. Is there any code out there that can do this? If not, is this because this approach isn't worthwhile, or simply because nobody has thought of it yet?

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• How to modify JSSE / How to do custom build

  - by Steffen Heil

  Hi I have a special requirement for one of my applications where I need the servers nounce (Handshaker.srv_random) when verifying the client certificate. Yet JSSEs X509TrustManager only passes me the certificate, no other information of the handshake. I have located the place, where checkClientTrusted is called (inside ServerHandshaker) and it would be easy to extend it to also allow some X509CustomTrustManager to be called with all required information. Yet this would require me to recompile JSSE... I also found jsse sources in openjdk. Now for my questions: What is the easiest way to compile jsse from openjdk? Can the resulting jsse.jar be used as a replacement for the (original) sun jre as a replacement for the included jsse.jar? Is there another (more standard compliant) way to archive what I am trying to do? I did not find a hook to use my own handshaker... Regards, Steffen

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• WPF Keyboard Remapping

  - by m1dst

  Hello, I am trying to remap the input of a textbox. For example. If a user enters a N then I would like to change it to a 9. I thought it might be best to try and catch it in the PreviewKeyDown event although I will also need to process paste attempts (I can solve that bit I think). Is PreviewKeyDown a good place to start? If so, how do I send the replacement key. I know that e.Handled = true will stop the original key being processed. Thanks.

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• Should I redesign my code when collegues says so?

  - by Kirill V. Lyadvinsky

  I wrote a function recently that finds maximum of two ints. Here is a code: int get_max (int(*a)(int(*)(int(*)()),int(*)(int(*)(int**))), int(*b)(int(*) (int(*)()),int*,int(*)(int(*)()))){return (int)((((int(*)(int(*)(int(*)()),int( *)(int(*)())))a)> ((int(*)(int(*)(int(*)()),int(*)(int(*)())))b))?((int(*)( int(*)(int(*)()),int(*)(int(*)())))a):((int(*)(int(*)(int(*)()),int(*)(int(*)( ))))b));} int main() { int x = get_max( (int(*)(int(*)(int(*)()),int(*)(int(*)(int**)))) 500, (int(*)(int(*)(int(*)()),int*,int(*)(int(*)()))) 100 ); cout << x << endl; // prints 500 as expected return 0; } It works fine, but my collegue says that I shouldn't use C style casts. But I think that all that modern static_cast's and reinterpret_cast's will make my code too cumbersome. Who's right? Should I redesign my code using C++ style casts or original code is OK?

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• PhantomJS not exactly rendering HTML to PNG

  - by John Leonard

  I'm having trouble adjusting PhantomJS to create a PNG file that matches the original browser presentation. Here is the entire sample html file. It's a sankey diagram creating using rCharts and d3-sankey. (You'll need to save the file to your hard drive and view it from there.) I'm running on Windows and using rasterize.js: >> phantomjs.exe rasterize.js test.html test.png ISSUE: Below is a snip of one of the text strings when viewed in a browser: And here is a snip of the same string from the PNG created by PhantomJS: How do I make the text-shadow go away? I've played around with various CSS attributes (text-shadow) and webkit-specific attributes (e.g., -webkit-text-rendering), but can't seem to make it go away. Is this a setting in PhantomJS? in the underlying webkit? or somewhere else? Many thanks!

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• Compile-time lookup array creation for ANSI-C?

  - by multiproximus

  A previous programmer preferred to generate large lookup tables (arrays of constants) to save runtime CPU cycles rather than calculating values on the fly. He did this by creating custom Visual C++ projects that were unique for each individual lookup table... which generate array files that are then #included into a completely separate ANSI-C micro-controller (Renesas) project. This approach is fine for his original calculation assumptions, but has become tedious when the input parameters need to be modified, requiring me to recompile all of the Visual C++ projects and re-import those files into the ANSI-C project. What I would like to do is port the Visual C++ source directly into the ANSI-C microcontroller project and let the compiler create the array tables. So, my question is: Can ANSI-C compilers compute and generate lookup arrays during compile time? And if so, how should I go about it? Thanks in advance for your help!

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• FF extension: a popup with dynamic menuitems, with each menu item having another popup

  - by encryptor

  I am building an extension that has a popup whose elements are constructed by a function call everytime the mouse hovers over the popup option. I am able to achieve this. Now I need to have a popup for each of the menu item (inside the original popup) which is not dynamic though. I have this code, but it does not work: var myMenuPopup = document.getElementById("file-popup4"); for (var m=0; m var newItem = document.createElement("menupopup"); newItem.setAttribute("label", publicdisplayname[m]); newItem.setAttribute("id", "public" + m); var new1 = document.createElement("menuitem"); new1.setAttribute("label","Home"); new1.setAttribute("id", "publichome" + m); newItem.onclick = function(){ } newItem.appendChild(new1); myMenuPopup.appendChild(newItem); but this doesnt work. Can someone please help me out with whats the problem

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• Career advice for a frustrated newbie programmer.

  - by Satoru.Logic

  Hi, all. This is my first year as a programmer. The programming language that I'm most familiar with is Python. I am maintaining a web2py based legacy system, alone, which means I have to grow up as an all-rounder. The original programmers on this project are nowhere to find, and there are hardly any usable documents about requirements or anything. I find it very frustrating every time I hear the users criticize the system, and I can't help explaining that "that was not my fault, those mess was there even before I entered this company." I wonder what should I do with this situation. Please give me some advice, thanks in advance.

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• replace file with hardlink to another file atomically

  - by Ben Clifford

  I have two directory entries, a and b. Before, a and b point to different inodes. Afterwards, I want b to point to the same inode as a does. I want this to be safe - by which I mean if I fail somewhere, b either points to its original inode or the a inode. most especially I don't want to end up with b disappearing. mv is atomic when overwriting. ln appears to not work when the destination already exists. so it looks like i can say: ln a tmp mv tmp b which in case of failure will leave a 'tmp' file around, which is undesirable but not a disaster. Is there a better way to do this? (what I'm actually trying to do is replace files that have identical content with a single inode containing that content, shared between all directory entries)

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• insert an image in a tablelayout without streching it android

  - by Sephy

  Hi, I'm having some trouble getting pictures inside a tablelayout...actually, each I have 2 columns and when i put a picture in a cell of the table, it's completely streched and disproportionnated...I can't find how to make it stay it's original inside the cell and let the rest of the space filled by white background for instance.... XML is like that : <TableLayout android:layout_width="fill_parent" android:stretchColumns="*" android:layout_marginLeft="3dip" android:layout_marginRight="10dip" android:layout_height="wrap_content"> <TableRow android:layout_marginBottom="10dip"> <TextView android:id="@+id/tv01" android:text="text1" android:textSize="14sp" android:layout_margin="1dip" android:layout_height="wrap_content" android:textColor="@color/bleuLink" android:layout_width="wrap_content" android:layout_weight="1" android:background="@color/background"></TextView> <Button android:id="@+id/add" android:background="@drawable/addressbook" android:layout_height="wrap_content" android:layout_width="wrap_content"></Button> <Button android:id="@+id/call" android:background="@drawable/greenphone" android:layout_height="wrap_content" android:layout_width="wrap_content"></Button> help plz, thx

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• It is possible to override a plugin's Controller from another plugin?

  - by fabschu

  I'm developing a plugin (MyPlugin) which combines some security functions to use it as a standard plugin for my next Grails application. It integrates the Spring-Security-Core and Spring-Security-UI plugins, and by its installation all dependencies should be installed automatically by adding the dependencies in the BuildConfig like: plugins { compile: ...} So far everything works fine, but in MyPlugin I'm changing the behaviour of the Spring-Security-UI plugin (password encoding in User Domain), by overwriting the UserController. Executing MyPlugin leads to the expected behaviour and new Users are created using the correct Controller. However, when installing MyPlugin in another Grails application, this behaviour fails and the original UserController of the Spring-Security-Ui plugin is used. I tried to solve this by configuring the dependsOn and loadAfter properties in the GrailsPlugin file, but without any success. Is it possible to fix this? Or is it only possible to overwrite behaviour/controllers in the main application?

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• call setListAdapter() from inside a thread

  - by Mats Hofman

  Hi, I have a problem with my ListActivity, i use a thread to show a ProgressDialog where get a list of all installed applications. I turn it into a list adapter and than i want to set the listadapter of the activity but i can't do that from the thread. I get the following error: ERROR/AndroidRuntime(14429): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. new Thread() { public void run() { showList(); // the method where i get all the apps and have the setListAdapter(); method progressDialog.dismiss(); } }.start(); How do I get it so I can use the setListAdapter from inside my thread

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• Is this fix to "PostSharp complains about CA1800:DoNotCastUnnecessarily" the best one?

  - by cad

  This question is about "is" and "as" in casting and about CA1800 PostSharp rule. I want to know if the solution I thought is the best one possible or if it have any problem that I can't see. I have this code (named OriginaL Code and reduced to the minimum relevant). The function ValidateSubscriptionLicenceProducts try to validate a SubscriptionLicence (that could be of 3 types: Standard,Credit and TimeLimited ) by casting it and checking later some stuff (in //Do Whatever). PostSharp complains about CA1800:DoNotCastUnnecessarily. The reason is that I am casting two times the same object to the same type. This code in best case will cast 2 times (if it is a StandardLicence) and in worst case 4 times (If it is a TimeLimited Licence). I know is possible to invalidate rule (it was my first approach), as there is no big impact in performance here, but I am trying a best approach. //Version Original Code //Min 2 casts, max 4 casts //PostSharp Complains about CA1800:DoNotCastUnnecessarily private void ValidateSubscriptionLicenceProducts(SubscriptionLicence licence) { if (licence is StandardSubscriptionLicence) { // All products must have the same products purchased List<StandardSubscriptionLicenceProduct> standardProducts = ((StandardSubscriptionLicence)licence).SubscribedProducts; //Do whatever } else if (licence is CreditSubscriptionLicence) { // All products must have a valid Credit entitlement & Credit interval List<CreditSubscriptionLicenceProduct> creditProducts = ((CreditSubscriptionLicence)licence).SubscribedProducts; //Do whatever } else if (licence is TimeLimitedSubscriptionLicence) { // All products must have a valid Time entitlement // All products must have a valid Credit entitlement & Credit interval List<TimeLimitedSubscriptionLicenceProduct> creditProducts = ((TimeLimitedSubscriptionLicence)licence).SubscribedProducts; //Do whatever } else throw new InvalidSubscriptionLicenceException("Invalid Licence type"); //More code... } This is Improved1 version using "as". Do not complain about CA1800 but the problem is that it will cast always 3 times (if in the future we have 30 or 40 types of licences it could perform bad) //Version Improve 1 //Minimum 3 casts, maximum 3 casts private void ValidateSubscriptionLicenceProducts(SubscriptionLicence licence) { StandardSubscriptionLicence standardLicence = Slicence as StandardSubscriptionLicence; CreditSubscriptionLicence creditLicence = Clicence as CreditSubscriptionLicence; TimeLimitedSubscriptionLicence timeLicence = Tlicence as TimeLimitedSubscriptionLicence; if (Slicence == null) { // All products must have the same products purchased List<StandardSubscriptionLicenceProduct> standardProducts = Slicence.SubscribedProducts; //Do whatever } else if (Clicence == null) { // All products must have a valid Credit entitlement & Credit interval List<CreditSubscriptionLicenceProduct> creditProducts = Clicence.SubscribedProducts; //Do whatever } else if (Tlicence == null) { // All products must have a valid Time entitlement // All products must have a valid Credit entitlement & Credit interval List<TimeLimitedSubscriptionLicenceProduct> creditProducts = Tlicence.SubscribedProducts; //Do whatever } else throw new InvalidSubscriptionLicenceException("Invalid Licence type"); //More code... } But later I thought in a best one. This is the final version I am using. //Version Improve 2 // Min 1 cast, Max 3 Casts // Do not complain about CA1800:DoNotCastUnnecessarily private void ValidateSubscriptionLicenceProducts(SubscriptionLicence licence) { StandardSubscriptionLicence standardLicence = null; CreditSubscriptionLicence creditLicence = null; TimeLimitedSubscriptionLicence timeLicence = null; if (StandardSubscriptionLicence.TryParse(licence, out standardLicence)) { // All products must have the same products purchased List<StandardSubscriptionLicenceProduct> standardProducts = standardLicence.SubscribedProducts; //Do whatever } else if (CreditSubscriptionLicence.TryParse(licence, out creditLicence)) { // All products must have a valid Credit entitlement & Credit interval List<CreditSubscriptionLicenceProduct> creditProducts = creditLicence.SubscribedProducts; //Do whatever } else if (TimeLimitedSubscriptionLicence.TryParse(licence, out timeLicence)) { // All products must have a valid Time entitlement List<TimeLimitedSubscriptionLicenceProduct> timeProducts = timeLicence.SubscribedProducts; //Do whatever } else throw new InvalidSubscriptionLicenceException("Invalid Licence type"); //More code... } //Example of TryParse in CreditSubscriptionLicence public static bool TryParse(SubscriptionLicence baseLicence, out CreditSubscriptionLicence creditLicence) { creditLicence = baseLicence as CreditSubscriptionLicence; if (creditLicence != null) return true; else return false; } It requires a change in the classes StandardSubscriptionLicence, CreditSubscriptionLicence and TimeLimitedSubscriptionLicence to have a "tryparse" method (copied below in the code). This version I think it will cast as minimum only once and as maximum three. What do you think about improve 2? Is there a best way of doing it?

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• Conflicting PACKAGE_NAME and other macros when using autotools.

  - by baol

  When using autotools (with a config.h file) for both a library and a software built on that library the compiler complains about a redefinition of some macros (PACKAGE_NAME, PACKAGE_TARNAME and so on). How can I prevent this? The config.h file is needed in the library to propagate it's setting to the software that use it. Right now I have a wrapper script library_config.h that includes the original config.h and provides defaults when the user is not using autotools, but even undefining the macros in that package I get the redefinition warning from gcc. #ifndef LIB_CONFIG_H #define LIB_CONFIG_H #ifdef HAVE_CONFIG_H # include "config.h" # undef PACKAGE # undef PACKAGE_BUGREPORT # undef PACKAGE_NAME # undef PACKAGE_STRING # undef PACKAGE_TARNAME # undef PACKAGE_VERSION # undef VERSION #else # if defined (WIN32) # define HAVE_UNORDERED_MAP 1 # define TR1_MIXED_NAMESPACE 1 # elif defined (__GXX_EXPERIMENTAL_CXX0X__) # define HAVE_UNORDERED_MAP 1 # else # define HAVE_TR1_UNORDERED_MAP 1 # endif #endif #endif I believe the best option would be to have a library without that macros: How can I avoid the definition of PACKAGE, PACKAGE_NAME and so on in the library when using autotools?

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• silverlight 3.0 communication with winforms

  - by abusemind

  I would like to create a winform on the client side for interaction with Silverlight 3.0. The basic idea is using the winform browser. I definitely need both the directions of communication. Would it be impossible by using JavaScript as a midware for the interaction or some better ways? Or is there any new features of Silverlight 3.0 supported for this kind of winform application communication? The original one is one the client's browser to run but now I would like to migrate it to the winform application. For the sake of time-saving, please don't mention about the WPF because of the gap between WPF and the Silverlight.

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• Netbeans Module not being deployed

  - by DK

  Original Question Title: C:\Documents and Settings\user\My Documents\NetBeansProjects\ConsultingAgency\nbproject\build-impl.xml:563: The module has not been deployed. hello I am new to javaserver face developing and following some netbean tutorials on this Generating a JavaServer Faces CRUD Application from a Database : http://netbeans.org/kb/docs/web/jsf-jpa-crud-wizard.html when I run this generated code on my computer I get this message and it doesn't seem to work. C:\Documents and Settings\user\My Documents\NetBeansProjects\ConsultingAgency\nbproject\build-impl.xml:563: The module has not been deployed. Can anyone help me solving this problem ? thanks in advance.

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• Can you precompile and merge part of an ASP.NET website and then continue development?

  - by michielvoo

  A big part of the web site is precompiled and merged, since it's almost never going to change. The precompiled bits can be replaced in case of updates to the original. I want to continue development of new pages, but when I browse to a new page I get the following error: The file '/Website/Test/Default.aspx' has not been pre-compiled, and cannot be requested. Is there any way around this? Edit: If I remove the precompileApp.config file I get the contents of the marker files when I browse them: This is a marker file generated by the precompilation tool, and should not be deleted!

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• EntityFramework EntityState and databinding along with INotifyPropertyChanged

  - by OffApps Cory

  Hello, all! I have a WPF view that displays a Shipment entity. I have a textblock that contains an asterisk which will alert a user that the record is changed but unsaved. I originally hoped to bind the visibility of this (with converter) to the Shipment.EntityState property. If value = EntityState.Modified Then Return Visibility.Visible Else Return Visibility.Collapsed End If The property gets updated just fine, but the view is ignorant of the change. What I need to know is, how can I get the UI to receive notification of the property change. If this cannot be done, is there a good way of writing my own IsDirty property that handles editing retractions (i.e. if I change the value of a property, then change it back to it's original it does not get counted as an edit, and state remains Unchanged). Any help, as always, will be greatly appreciated. Cory

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• Recompile a x86 code with LLVM to some faster one x86

  - by osgx

  Hello Is it possible to run LLVM compiler with input of x86 32bit code? There is a huge algorithm which I have no source code and I want to make it run faster on the same hardware. Can I translate it from x86 back to x86 with optimizations. This Code runs a long time, so I want to do static recompilation of it. Also, I can do a runtime profile of it and give to LLVM hints, which branches are more probable. The original Code is written for x86, and uses no SSE/MMX/SSE2. After recompilation It has a chances to use x86_64 and/or SSE3. Also, The code will be regenerated in more optimal way to hardware decoder. Thanks.

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• wxWidgets: How to initialize wxApp without using macros and without entering the main application l

  - by m_pGladiator

  We need to write unit tests for a wxWidgets application using Google Test Framework. The problem is that wxWidgets uses the macro IMPLEMENT_APP(MyApp) to initialize and enter the application main loop. This macro creates several functions including int main(). The google test framework also uses macro definitions for each test. One of the problems is that it is not possible to call the wxWidgets macro from within the test macro, because the first one creates functions.. So, we found that we could replace the macro with the following code: wxApp* pApp = new MyApp(); wxApp::SetInstance(pApp); wxEntry(argc, argv); That's a good replacement, but wxEntry() call enters the original application loop. If we don't call wxEntry() there are still some parts of the application not initialized. The question is how to initialize everything required for a wxApp to run, without actually running it, so we are able to unit test portions of it?

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• Intellij + GWT 2: Development Mode ignores changes to static content

  - by Kaffeine Coma

  The new Development Mode in GWT 2 is awesome, but unfortunately as launched from Intellij IDEA 9, it does not seem to notice changes made to static files such as html, css, etc. It immediately see changes in *.java files, but not the static ones. If I make a change in a static file I need to quite the Development Mode tool and re-launch it. This is painfully slow, and negates much of the point of using dev mode in the first place I assume this is some artifact resulting from the way the Intellij runner launches it- it creates an out/artifacts/project_war_exploded directory with the static content and class files. How can I get Intellij Dev Mode tool to follow changes made to the original static source files?

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