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• Image bit depth values.

  - by pencilslate

  REPHRASED QUESTION: I am coming up with a list of possible image bit depth values that could be used as a predefined reference list in my application. I could think of 8,16,24 and 32 bit depths. The image formats considered are BMP, JPEG, PNG and GIF. I understand the bit depth decides the quality and thereby the storage requirements for the image. The application is used to store user uploaded images(non-medical, non-DICOM). Are there more bit depths other than the ones mentioned above that i should be including in my list? Are there any stats on the usage of the images with bit depths? Appreciate your response!

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• Condition checking vs. Exception handling

  - by Aidas Bendoraitis

  When is exception handling more preferable than condition checking? There are many situations where I can choose using one or the other. For example, this is a summing function which uses a custom exception: # module mylibrary class WrongSummand(Exception): pass def sum_(a, b): """ returns the sum of two summands of the same type """ if type(a) != type(b): raise WrongSummand("given arguments are not of the same type") return a + b # module application using mylibrary from mylibrary import sum_, WrongSummand try: print sum_("A", 5) except WrongSummand: print "wrong arguments" And this is the same function, which avoids using exceptions # module mylibrary def sum_(a, b): """ returns the sum of two summands if they are both of the same type """ if type(a) == type(b): return a + b # module application using mylibrary from mylibrary import sum_ c = sum_("A", 5) if c is not None: print c else: print "wrong arguments" I think that using conditions is always more readable and manageable. Or am I wrong? What are the proper cases for defining APIs which raise exceptions and why?

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• PInvokeStackImbalance C# call to unmanaged C++ function

  - by user287498

  After switching to VS2010, the managed debug assistant is displaying an error about an unbalanced stack from a call to an unmanaged C++ function from a C# application. The usuals suspects don't seem to be causing the issue. Is there something else I should check? The VS2008 built C++ dll and C# application never had a problem, no weird or mysterious bugs - yeah, I know that doesn't mean much. Here are the things that were checked: The dll name is correct. The entry point name is correct and has been verified with depends.exe - the code has to use the mangled name and it does. The calling convention is correct. The sizes and types all seem to be correct. The character set is correct. There doesn't seem to be any issues after ignoring the error and there isn't an issue when running outside the debugger. C#: [DllImport("Correct.dll", EntryPoint = "SuperSpecialOpenFileFunc", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Ansi, ExactSpelling = true)] public static extern short SuperSpecialOpenFileFunc(ref SuperSpecialStruct stuff); [StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)] public struct SuperSpecialStruct { public int field1; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)] public string field2; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)] public string field3; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)] public string field4; public ushort field5; public ushort field6; public ushort field7; public short field8; public short field9; public uint field10; public short field11; }; C++: short SuperSpecialOpenFileFunc(SuperSpecialStruct * stuff); struct SuperSpecialStruct { int field1; char field2[256]; char field3[20]; char field4[10]; unsigned short field5; unsigned short field6; unsigned short field7; short field8; short field9; unsigned int field10; short field11; }; Here is the error: Managed Debugging Assistant 'PInvokeStackImbalance' has detected a problem in 'Managed application path'. Additional Information: A call to PInvoke function 'SuperSpecialOpenFileFunc' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.

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• Would dynamically created JavaScript files be cached?

  - by venksster

  So my application uses a LOT of js files. thats a lot of http requests. I decided to combine them dynamically at the server in packs of 3-4 files clubbed by functionality. My client side request is: ...script type="text/javascript" src="http://mydomain.com/core-js.php" ... My server side does: --core-js.php-- header("Content-type: application/x-javascript"); include_once('file1.js'); include_once('file2.js'); include_once('file3.js'); include_once('file4.js'); I am setting a far future expire header on core-js.php. My question is, would core-js.php be cached at the client side? If it would be, could someone please explain how? Thanks!

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• SQL Try catch purpose unclear

  - by PaN1C_Showt1Me

  Let's suppose I want to inform the application about what happened / returned the SQL server. Let's have this code block: BEGIN TRY -- Generate divide-by-zero error. SELECT 1/0; END TRY BEGIN CATCH SELECT ERROR_NUMBER() AS ErrorNumber, ERROR_SEVERITY() AS ErrorSeverity, ERROR_STATE() as ErrorState, ERROR_PROCEDURE() as ErrorProcedure, ERROR_LINE() as ErrorLine, ERROR_MESSAGE() as ErrorMessage; END CATCH; GO and Let's have this code block: SELECT 1/0; My question is: Both return the division by zero error. What I don't understand clearly is that why I should surround it with the try catch clausule when I got that error in both cases ? Isn't it true that this error will be in both cases propagated to the client application ?

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• Lamp with mod_fastcgi

  - by Jonathan

  Hi! I am building a cgi application, and now I would like it to be like an application that stands and parses each connection, with this, I can have all session variables saved in memory instead of saving them to file(or anyother place) and loading them again on a new connection I am using lamp within a linux vmware but I can't seem to find how to install the module for it to work and what to change in the httpd.conf. I tried to compile the module, but I couldn't because my apache isn't a regular instalation, its a lamp already built one, and it seems that the mod needs the apache directory to be compiled. I saw some coding examples out there, so I guess is not that hard once its runing ok with Apache Can you help me with this please? Thanks, Joe

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• Best practice for error handling in an Android Service

  - by Omar Kohl

  I have an Android Service that does some background processing on an image using a separate Thread. If an error occurs in this Service or even worse in the thread, what is the best practice to inform the launching Activity of the problem and allow the application to recover to a stable state (i.e. the state it was in before launching the service). From within the Service I could post a Toast or a Notification, but that doesn't help me. I would like to inform the user about the problem but at the same time recover the application to a stable state.

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• If terminating a hung thread is a good idea, how do I do it safely?

  - by Steve

  My Delphi program relies heavily on Outlook automation. Outlook versions prior to 2007-SP2 tend to get stuck in memory due to badly written addins and badly written Outlook code. If Outlook is stuck, calling CreateOleObject('Outlook.Application') or GetActiveObject ... doesn't return and keeps my application hanging till Outlook.exe is closed in the task manager. I've thought of a solution, but I'm unsure whether it's good practice or not. I'd start Outlook with CreateOleObject in a separate thread, wait 10 seconds in my main thread and if Outlook hangs (CreateOleObject doesn't return), offer the user to kill the Outlook.exe process from my program. But since I don't want to force the user to kill the Outlook.exe process, as an alternative I also need a way to kill the new thread in my program which keeps hanging now. Is this good practice? How can I terminate a hanging thread in Delphi without leaking memory?

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• Passing arguments to java vm from NSIS script

  - by CodeBuddy

  I'm developing my first java application using Eclipse. I've recently needed to adjust the amount of memory allocated by passing -Xmx256M to the JVM. The application is currently package up as a runnable jar and installed using the NSIS. I'm having a problem passing arguments to the jar file once its installed. What is the common practice for doing this? Here is what I'm currently doing in my nsi file: CreateShortcut "$SMPROGRAMS\$StartMenuGroup\$(^Name).lnk" "$SYSDIR\javaw.exe" "-jar -Xmx256M $INSTDIR\Foo.jar" This results in the following being created as the shortcut Target on windows: C:\WINDOWS\system32\javaw.exe -jar -Xmx256M C:\Program Files\Foo\Foo.jar Unfortunately this does not work due to the space in C:\Program Files, If I change the link created manually to include quotes all is well: C:\WINDOWS\system32\javaw.exe -jar -Xmx256M "C:\Program Files\Foo\Foo.jar"

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• Ruby character encoding problems in netabenas and command wíndow

  - by salgo60

  I use netbeans as development IDE and runs the application from cmd but have problems to display ISO 8859-1 characters like åäö correct in both cmd window and when I run the application from netbeans Question: What is best practice to set it up Right now I do @output.puts indent + "V" + 132.chr + "lkommen till Ruby Camping!" to get ä My environment chcp 65001 Active code page: 65001 ruby main.rb Source encoding: <Encoding:US-ASCII> Default external: #<Encoding:UTF-8> Default internal: nil Locale charmap: "CP65001" where I have in the code def self.printEncoding puts "Source encoding: #{__ENCODING__.inspect}" if defined? __ENCODING__ if defined? Environment::Encoding puts "Default external: #{Encoding.default_external.inspect}" puts "Default internal: #{Encoding.default_internal.inspect}" puts "Locale charmap: #{ Encoding.locale_charmap.inspect}" end puts "LANG environment variable: #{ENV['LANG'].inspect}" unless ENV['LANG'].nil? end ruby -v ruby 1.9.1p378 (2010-01-10 revision 26273) [i386-mingw32]

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• Searching for patterns to create a TCP Connection Pool for high performance messaging

  - by JoeGeeky

  I'm creating a new Client / Server application in C# and expect to have a fairly high rate of connections. That made me think of database connection pools which help mitigate the expense of creating and disposing connections between the client and database. I would like to create a similar capability for my application and haven't been able to find any good examples of how to apply this pattern. Do I really need to spin up an instance of a TcpClient every time I want to send a message to the server and receive a receipt message? Each connection is expected to transport between 1-5KB with each receiving a 1KB response message. I realize this question is somewhat vague, but I am starting from scratch so I am open to suggestions. Even if that means my suppositions are all wrong.

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• memory of drawables, is it better to have resources inside APK, outside APK or is it the same for me

  - by Daniel Benedykt

  Hi I have an application that draws a lot of graphics and change them. Since I have many graphics, I thought of having the images outside the APK, downloaded from the internet as needed, and saved on the files application folder. But I started to get outOfMemory exceptions. The question is: Does android handle memory different if I load a graphic from APK than if I load it from 'disk'? code using APK: topView.setBackgroundResource(R.drawable.bg); code if image is outside APK: Drawable d = Drawable.createFromPath(pathName); topView.setBackgroundDrawable(d); Thanks Daniel

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• Flex / ZendAMF / PHP app, corrupted data with some linux clients problem

  - by Laurent Jégou

  Hello, i'm buiding a survey web application, using Flex for the front-end (nice forms), and a MySQL database for the storage, linked by PHP with the help of ZendAMF. I largely borrowed from this nice tutorial by Alan Gruskoff : http://digitalshowcase.biz/wordpress/?page_id=26 (The only one tutorial i've found to work with the last version of Flex). The app seems to works nicely in my tests, except on certain linux boxes : the data is somehow corrupted : there is no error message, no glitch, but the response of the forms are not what the user selected. I tried to reproduce the error on a fresh installed ubuntu VM, but it works fine. I've asked friends for some tests, and several linux users showed the same problem, on ubuntu and suse machines, all freshly updated and functionnal. The application was targeted to be the survey tool for my doctoral thesis, so i'm quite desperate here, and before i'm dumping it to start anew with php only, i'm asking here in case someone can help, thanks :-) Please excuse my english, by the way. LJ.

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• Flash and ADA compliancy

  - by milesmeow

  Has anyone here created a site or application that is ADA (Section 508) compliant? What features did your site/application support? One example is creating forms in Flash. The standards say that "When electronic forms are used, the form shall allow people using Assistive Technology to access the information, field elements, and functionality required for completion and submission of the form, including all directions and cues." Does Flash allow this? I guess you can build in your own tabbing and triggering voiceovers and such. Just wanted to get a sense of what people have done to tackle this issue.

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• Service design or access to another process

  - by hotyi

  I have a cache service,it's works as .net remoting, i want to create another windows service to clean up the that cache service by transfer the objects from cache to files. because they are in separate process, is their any way i could access that cache service or do i have to expose a method from the cache service to do that clean up work? the "clean up" means i want to serialize the object from Cache to file and these saved file will be used for further process. let me explain this application more detail. the application is mainly a log service to log all the coming request and these request will be saved to db for further data mining. we have 2 design for this log system 1) use MSMQ, but seems it's performance is not good enough, we don't use it. 2) we design a cache service, each request will be saved into the cache, and we need another function to clean up the cache by serialize the object to file.

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• getting data problem with MYSQL under linux

  - by aelshereay

  Hi all, Recently I started to use Linux (Ubuntu 9.10) instead of windows. I am working on a java web application with Spring, MYSQL with jpa. However, before to install linux I made a backup file from the database, then installed linux, installed the MYSQL Query Browser and Administrator tools, and using the Admin tool restored the backup file, then got all the tables and made a simple select statement from one of the tables and got result normally and everything seems to work just fine. There a USER table, and there's a namedQuery defined to get a user by userName, the problem is that when I pass a correct userName I still get nothing! I really don't know what is the problem! The application was working perfectly under windows! Please, can anyone help me to solve this problem? Thank you in advance.

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• Send Keyboard Events from one Form to another Form

  - by thalm

  Hello, my question is quite simple: Our C# application has one MainForm with a menu and several keyboard shortcuts associated with the menu entries. Now we need to trigger the menu entries from some child forms too. But since the MainForm is inactive when one of the child forms is active, the shortcuts do not work. Is there a simple way to propagate all keyboard events from the child form to the 'Owner' form? Or just to another form in general? Ah, and we cannot use some low level windows stuff, because we need to run the application on Mono/Linux too.

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• Why would a error get thrown inside my try-catch?

  - by George Johnston

  I'm pushing a copy of our application over to a new dev server (IIS7) and the application is blowing up on a line inside of a try-catch block. It doesn't happen locally, it actually obey's the rules of a try-catch block, go figure. Any idea why this would be happening? Shouldn't it just be failing silently? Is there something environmental I need to enable/disable? Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Line 229: Try Line 230: Here >> : _MemoryStream.Seek(6 * StartOffset, 0) Line 232: _MemoryStream.Read(_Buffer, 0, 6) Line 233: Catch ex As IOException End Try Although it doesn't matter for answering this question, I thought I would mention that it's third party code for the Geo IP lookup.

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• Open an Access database and run one of its Macros from Excel

  - by sqlnoob

  From Excel, I need to open an Access database and run one of the database's macros. I'm using Excel and Access 2007. Here is my code in Excel: Sub accessMacro() Dim appAccess As New Access.Application Set appAccess = Access.Application appAccess.OpenCurrentDatabase "C:\blah.mdb" appAccess.Visible = True appAccess.DoCmd.RunMacro "RunQueries.RunQueries" appAccess.CloseCurrentDatabase End Sub In the Access Database, there is a procedure named RunQueries in a module named RunQueries. Each time I run this, I get the following error: Runtime error '2485': Microsoft Access Office can't find the object 'RunQueries.' I have also tried: appAccess.DoCmd.RunMacro "RunQueries" and I get the same errors message. Any idea how to do this? By the way, I could go into a long explanation about why I need to do this, but let me just say that I've already argued against it, and I have to do it this way (meaning, I have to use Excel as a frontend to open several Access dbs and run their macros).

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• Why OpenGL ES texture mapping is very slow?

  - by Cinar

  I have an Android application that displays VGA (640x480) frames using OpenGL ES. The application reads each frame from a movie file and updates the texture accordingly. My problem is that, it is taking almost 30 ms. to draw each frame using OpenGL. Similar test using the Canvas/drawBitmap was around 6 ms on the same device. I'm following the same OpenGL calls that VLC Media Player is using, so I'm assuming that those are optimized for this purpose. I just wanted to hear your thoughts and ideas about it?

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• Facebook proxy email not arriving -- do I need permissions?

  - by Felix

  I'm building a website that allows user to connect using Facebook Connect. So far I'm able to log the user in and fetch data about them (name, email, pic, etc.). If I fetch the email (using Users.getInfo) I get a proxied email ([email protected]), which is absolutely great. Problem is, that email doesn't work. I've tried sending an email to it and I never received it. There are two reasons I see that could cause this: I don't have enough permissions. Ok, I can understand that, but if I don't have enough permissions then why are they returning an email at all? The email has to be somehow sent from the application itself (I've tried sending it from my Gmail account) -- but how would Facebook know that the email is coming from the application? So which is it? Or is it something else?

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• Define Servlet Context in WAR-File

  - by er4z0r

  Hi, How can I tell e.g. Tomcat to use a specific context path when given my WAR-File? Example: I have a war file created by maven build and the resulting name of the file is rather long. So I do not want the tomcat manager application to use the filename of the war as the context. Supplying a context.xml in META-INF did not produce the desired results I also found this in the documentation for the path attribute of Context: The value of this field must not be set except when statically defining a Context in server.xml, as it will be inferred from the filenames used for either the .xml context file or the docBase. So it does not seem to be the right way to tell the application-server what the path for my WAR should be. Any more hints?

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• CMIS explorer webapp

  - by Nicolas Raoul

  CMIS is a recently approved standard for accessing ECM repositories. My idea is to create a repository explorer using CMIS, under the form of an open source Java/JEE Web Application. The main interest would probably be for integrators, using it as a framework on which to quickly build repository access intranet/extranet applications. Of course, if such an open source project already exists, I would rather contribute to it rather than start a competing effort. So, does such an application/framework already exist? As open source? The only one I have found so far is chemistry-opencmis-test-browser, which is intended for tests and seems really inconvenient to extend for business use (no MVC, no IoC).

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• applicationShouldTerminateAfterLastWindowClosed: does not seem to work when the red x is used to clo

  - by Michael Minerva

  I have a small OSX Cocoa app that just bring up an IKPicutreTaker and saves the picture to a file if one is set. I use applicationShouldTerminateAfterLastWindowClosed: to close the application when the pictureTaker is closed. This all works fine when I either set(this is done when you have picked the picture you want) or when you hit cancel, but when I click on the red arrow in the top left of the windows, the application does not quit when the window is closed this way. Is this intended functionality or am I doing something wrong (not setting some flag?). Also, is there some way to disable this button?

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• How to clear the memory allocated for Customized Exception

  - by ilan

  Hi All I have a customized exception class. say class CustomExcep{}; My Application is a middleware made of C++. It is a webservice which is used for the communication between Java based web Front-end and the DCE Backend. whenever the DCE Backend is not running or down due to some core dumps, the application throws the CustomExcep. It's like this. CustomExcep * exc = new CustomExcep(); throw exc; I am unable to use the stack memory for this as it leads to some run-time exceptions. I need a solution to clear the memory used by this CustomException. Can we use Templates for this purpose? Any help would be appreciated. Thanks in Advance.

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