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• MSP430 CMP operator

  - by Ludicrous

  Let's say I have the MSP430 assembly segment below: r15: 439c Memory map: 4390: 6045 0200 9c43 6400 8844 5044 363a 0000 Code: 448a: cmp #0x363a, 0x0(r15) 4490: jnz $+0x1c 4492: Code continues . . . 44ac: Jump to location The goal is to have the Z flag high. To do this with a cmp, both src and dst must be equal. If I have 363a in the memory location of r15, why is it that the resulting cmp does not trigger the Z flag? Through experimentation, I found that putting 3a36 in the memory location of r15 did in fact trigger the Z flag, but I don't understand why. If anyone could bring this to light, I would greatly appreciate it. If more information is needed, I will gladly provide it.

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• Keep user connected with WCF

  - by Frank

  Hi, Context : I would like to create WCF Service that can be consumed by an ASP.NET web app and an iphone application. My goal : Create an SOA architecture. My problem : How "keep the user connected" on the WCF service? I tried asp.net membership provider with wcf and that works fine. But the problem is that I have to give username/password for each call. What can I do to resolve this problem? What's the best way to solve this kind of problem? Possible solution after googlising : Use Windows Identity Foundation. Thank you, Frank

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• Using C preprocessor to construct a string literal for scanf?

  - by Brett

  I'm attempting to create an sscanf string literal to aid in buffer overrun prevention in C99. The goal is something like: #define MAX_ARG_LEN 16 char arg[MAX_ARG_LEN] = ""; if (sscanf(arg, "%"(MAX_ARG_LEN-1)"X", &input) > 0) The obvious "manual" solution is something like: #define MAX_ARG_LEN 16 #define MAX_ARG_CHARS "15" char arg[MAX_ARG_LEN] = ""; if (sscanf(arg, "%"MAX_ARG_CHARS"X", &input) > 0) However, I would prefer something to automatically generate "%15X" given a buffer size of 16. This link is almost works for my application: http://stackoverflow.com/questions/240353/convert-a-preprocessor-token-to-a-string but it does not handle the -1. Suggestions?

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• What's wrong with my logic here?

  - by stu

  In java they say don't concatenate Strings, instead you should make a stringbuffer and keep adding to that and then when you're all done, use toString() to get a String object out of it. Here's what I don't get. They say do this for performance reasons, because concatenating strings makes lots of temporary objects. But if the goal was performance, then you'd use a language like C/C++ or assembly. The argument for using java is that it is a lot cheaper to buy a faster processor than it is to pay a senior programmer to write fast efficient code. So on the one hand, you're supposed let the hardware take care of the inefficiencies, but on the other hand, you're supposed to use stringbuffers to make java more efficient. While I see that you can do both, use java and stringbuffers, my question is where is the flaw in the logic that you either use a faster chip or you spent extra time writing more efficient software.

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• Choosing embedded EJB 3.x container to run JEE 5 app on Tomcat

  - by grigory

  I am sorry in advance if my question sounds too generic - I am doing all preliminary research myself but nothing substitutes real experience... My goal is to port a legacy JEE application (pre-EJB 3.x) to Tomcat with embedded EJB container. My choices currently stand as follows: JBoss Embeddable EJB Apache OpenEJB OW2 Consortium EasyBeans anything else? I am expecting to use JMS (with MDBs), Session beans (stateful and stateless), JPA and I am really excited about using JSF with Seam. Now, given choices above, are there any advantages in using one or another embedded EJB provider?

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• Removing zombie locks in Subversion

  - by ThatBlairGuy

  I'm trying to find a way to remove zombie locks using the Subversion command line tools. The eventual goal is to do this from a hook script, but I haven't been able to work out the command line to use when you only have a physical repository path. (Using svnadmin rmlocks only seems to work for locks which exist in the HEAD revision.) Ideally, I'd like to do this via the post-commit hook script using the command line tools. (I'm aware of the python script for this purpose, but we'd prefer not to install python on that server for this single use.) We're a .NET shop, so creating a tool with the SharpSVN library is also a possibility, but the only unlock capability there appears to be in the SVNClient class. So it's really two questions: Is there a way to do this with the command line tools? If not, is there a way to do it from SharpSVN? (Or perhaps another library?)

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• How can I stop my application?

  - by Roman

  I have the main thread from which I start a window using invokeLater. I run my application from command line. So, when application is running I see the window and my command line is "blocked" by the application. I can stop the application either by closing the window (as a result the command line is unblocked) or by typing Ctrl-C in the command line (as a result the window disappear). I wanted to be able to stop the application by clicking on a button in the window of the application. I used setVisible(false) for that. But in this way I can achieve the goal only partially. My window really disappear but the command line is still blocked. So, the software is still running. Well, I assume it's because some other threads are still running. But how can I easily close all these threads (like I do by closing the window of the application manually).

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• Objective-C - How To Remove Characters From a String?

  - by iAm

  I have a UILable that has a formatted String (formatted for currency), so there is a dollar sign, $21.34. In the core data entity the attribute is of a type double, I am using an NSDecimalNumber to save to the database. self.purchase.name = self.nameTextField.text; NSString *string = self.amountLabel.text NSDecimalNumber *newAmount = [[NSDecimalNumber alloc] initWithString:string]; NSLog(@"%@", string); // THIS RETURNS NaN, because of dollar sign i think NSManagedObjectContext *context = self.purchase.managedObjectContext; NSError *error = nil; if (![context save:&error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } Anyway, I need this to not be NaN, so my thinking is to remove the dollar sign, but i do not know how to do that, or perhaps there is a better way to accomplish my goal.

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• Piping to findstr's input, dos prompt

  - by Gauthier

  I have a text file with a list of macro names (one per line). My final goal is to get a print of how many times the macro's name appears in the files of the current directory. The macro's names are in C:\temp\macros.txt. type C:\temp\macros.txt in the dos prompt prints the list alright. Now I want to pipe that output to the standard input of findstr. type C:\temp\macros.txt | findstr *.ss (ss is the file type where I am looking for the macro names). This does not seem to work, I get no result (very fast, it does not seem to try at all). findstr <the first row of the macro list> *.ss does work. I also tried findstr *.ss < c:\temp\macros.txt with no success.

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• Missing artifact error in Maven

  - by abhin4v

  I get a missing artifact error during Maven build because one of the dependencies declares it's parent artifact using a property for the version. Now the property itself is declared in the parent pom and my project's build fails giving this error: [ERROR] Failed to execute goal on project abc: Unable to get dependency information for xyz:pqr:jar:SNAPSHOT: Failed to process POM for xyz:pqr:jar:SNAPSHOT: Non-resolvable parent POM xyz:pqr-parent:${someversion} for xyz:pqr:${someversion}: Failed to resolve POM for xyz:pqr-parent:${someversion} due to Missing: ---------- 1) xyz:pqr-parent:pom:${someversion} ---------- 1 required artifact is missing. for artifact: xyz:pqr-parent:pom:${someversion} I have verified that the artifacts are present in correct location in the repository. Is there a way to specify the value of someversion property used in the dependency pom? If not, how should the dependency pom be changed to resolve the error?

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• How to use C to write to flash drive bootsector despite error 'Failed to open file to write.:Permiss

  - by updateraj

  My goal is to manipulate the boot-sector in my flashdrive (volume E:) I am using XP. I am able to read the boot-sector FILE *fp_read = fopen("\\\\.\\E:", "rb"); /* Able to proceed to read boot sector */ however i am not able to open the file to write using fopen in 'wb' mode. FILE *fp_read = fopen("\\\\.\\E:", "wb"); /* Unable to proceed due to Failed to open file to write.:Permission Denied */ The flash-drive is not in use at the moment of execution. Hex-editors are able to manipulated boot sector etc, i believe it possible to do so in c. Any suggestion or insight to overcome the access problem so as to be able to write?

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• What are some good books on software testing/quality?

  - by mjh2007

  I'm looking for a good book on software quality. It would be helpful if the book covered: The software development process (requirements, design, coding, testing, maintenance) Testing roles (who performs each step in the process) Testing methods (white box and black box) Testing levels (unit testing, integration testing, etc) Testing process (Agile, waterfall, spiral) Testing tools (simulators, fixtures, and reporting software) Testing of embedded systems The goal here is to find an easy to read book that summarizes the best practices for ensuring software quality in an embedded system. It seems most texts cover the testing of application software where it is simpler to generate automated test cases or run a debugger. A book that provided solutions for improving quality in a system where the tests must be performed manually and therefore minimized would be ideal.

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• rails: date type and GetDate

  - by cbrulak

  This is a follow up to this question: http://stackoverflow.com/questions/2930256/unique-responses-rails-gem I'm going to create an index based on the user id, url and a date type. I want date type (not datetime type) because I want the day, the 24 hour day to be part of the index to avoid duplication of page views counts on the same day. In other words: A view only counts once in a day by a visitor. I also want the default value of that column (viewdate) to be the function GETDATE(). This is what I have in my migration: execute "ALTER TABLEpage_viewsADD COLUMN viewdate datetime DEFAULTGETDATE()`" But the value viewdate is always empty. What am I missing? (as an aside, any other suggestions for accomplishing this goal?)

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• How to obtain the root of a tree without parsing the entire file?

  - by Matt.

  I'm making an xml parser to parse xml reports from different tools, and each tool generates different reports with different tags. For example: Arachni generates an xml report with <arachni_report></arachni_report> as tree root tag. nmap generates an xml report with <nmaprun></nmaprun> as tree root tag. I'm trying not to parse the entire file unless it's a valid report from any of the tools I want. First thing I thought to use was ElementTree, parse the entire xml file (supposing it contains valid xml), and then check based on the tree root if the report belongs to Arachni or nmap. I'm currently using cElementTree, and as far as I know getroot() is not an option here, but my goal is to make this parser to operate with recognized files only, without parsing unnecessary files. By the way, I'm Still learning about xml parsing, thanks in advance.

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• Addressing "Access Denied" Exception with WMI Calls

  - by Joe

  I'm getting an exception with a message of "Access Denied" when executing against a WMI request. Some WMI requests appear to require higher security privileges than others. Ultimately my goal is to monitor process launches within the system and log. Regardless if there is a better approach, its now become a vendetta in getting this WMI approach to work. I've attempted the code at Security Tools - WMI Programming Using C#.Net and still receive the exception. If you copy the code found in the blog entry you can reproduce my issue. Another post on a similar topic can be found at link text but again, try the code and you'll the see the same security exception. How do I permit my code to execute these WMI requests? I'm running on Windows 7 Pro and VS 2010 in a new C# command line project.

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• SQL to return dates that fall in period and range

  - by Nate

  Hey stackers, I’ve been grinding my head on this for a while… My goal is to return all dates that fall between a start and end date and have a certain period as a factor, from the start date. (hard to explain) For example… Start Date: Nov 20, 1987; End Date: Jan 01, 1988; Period: 10 days; I want these dates: Nov 20, 1987; Nov 30, 1987; Dec 10, 1987; Dec 20, 1987; Dec 30, 1987; I already have a date table with all dates from 1900 to 2099. The period could be by days, months or years. Any ideas? Let me know if you need more info.

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• Operation can only be performed on cells that belong to a DataGridView control

  - by The Demigeek

  The following code throws an InvalidOperationException with the above message and I don't understand why. My code calls the following method when the user may have made changes to the datagridview's underlying data source. The goal is to update the display with any changed data, and preserve the sort column and order. private void ReloadDataGridBindingListFromDatabase() { DataGridView dgv = myDataGridViewControl; DataGridViewColumn sortedColumn = dgv.SortedColumn; SortOrder sortOrder = dgv.SortOrder; //do stuff here to refresh dgv.DataSource if (sortedColumn != null) { //this line throws an exception sortedColumn.HeaderCell.SortGlyphDirection = sortOrder; } //etc. } Clearly, sortedColumn.HeaderCell is a cell that belongs to a DataGridView control. So why am I getting this exception? Many thanks for your input.

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• Check which nodes of Beowulf HPC cluster system are free from PHP app?

  - by Skuja

  I am working on my diploma thesis project. I have access to 32Node Dell poweredge HPC cluster system with Linux(Debian i think) installed on it. My first goal is to create web (PHP) app where logged users could see free and busy nodes, turn them on and off. I am planning to do something like this - write some cron daemon that would run every 30seconds or other interval, and it could run ping utility for each node to find out if it is on or off, then write results to some file. Then from my web app i could read the info. Will it be a good solution? What existing for node management solutions are there?

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• The next step & technology towards web services.

  - by webzide

  Hi, My name is Dennis and I am pretty ambitious of creating the next big thing for the web. I have ideas but now I gotta get to work to learn the tools. I am learning Javascript. I don't know if next step for me to take is PHP or some suggests RUBY on Rails. What are the pros and cons. With your experience, I wish you could hint me to the right direction. Thanks. I don't mind working hard. My goal is to create a comprehensive and secure web service platform as well as a fast and user friendly UI.

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• OpenCV to use in memory buffers or file pointers

  - by The Unknown

  The two functions in openCV cvLoadImage and cvSaveImage accept file path's as arguments. For example, when saving a image it's cvSaveImage("/tmp/output.jpg", dstIpl) and it writes on the disk. Is there any way to feed this a buffer already in memory? So instead of a disk write, the output image will be in memory. I would also like to know this for both cvSaveImage and cvLoadImage (read and write to memory buffers). Thanks! My goal is to store the Encoded (jpeg) version of the file in Memory. Same goes to cvLoadImage, I want to load a jpeg that's in memory in to the IplImage format.

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• How to engineer features for machine learning

  - by Ivo Danihelka

  Do you have some advices or reading how to engineer features for a machine learning task? Good input features are important even for a neural network. The chosen features will affect the needed number of hidden neurons and the needed number of training examples. The following is an example problem, but I'm interested in feature engineering in general. A motivation example: What would be a good input when looking at a puzzle (e.g., 15-puzzle or Sokoban)? Would it be possible to recognize which of two states is closer to the goal?

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• CFLAGS vs CPPFLAGS

  - by EB

  I understand that CFLAGS (or CXXFLAGS for C++) are for the compiler, whereas CPPFLAGS is used by the preprocessor. But I still don't understand the difference. I need to specify an include path for a header file that is included with #include -- because #include is a preprocessor directive, is the preprocessor (CPPFLAGS) the only thing I care about? Under what circumstances do I need to give the compiler an extra include path? In general, if the preprocessor finds and includes needed header files, why does it ever need to be told about extra include directories? What use is CFLAGS at all? (In my case, I actually found that BOTH of these allow me to compile my program, which adds to the confusion... I can use CFLAGS OR CPPFLAGS to accomplish my goal (in autoconf context at least). What gives?)

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• how random is Math.random() in java across different jvms or different machines

  - by user881480

  I have a large distributed program across many different physical servers, each program spawns many threads, each thread use Math.random() in its operations to draw a piece from many common resource pools. The goal is to utilize the pools evenly across all operations. Sometimes, it doesn't appear so random by looking at a snapshot on a resource pool to see which pieces it's getting at that instant (it might actually be, but it's hard to measure and find out for sure). Is there something that's better than Math.random() and performs just as good (not much worse at least)?

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• How to get the git commit count?

  - by Splo

  I'd like to get the number of commits of my git repository, a bit like SVN revision numbers. The goal is to use it as a unique, incrementing build number. I currently do like that, on Unix/Cygwin/msysGit: git log --pretty=format:'' | wc -l But I feel it's a bit of a hack. Is there a better way to do that? It would be cool if I actually didn't need wc or even git, so it could work on a bare Windows. Just read a file or a directory structure ...

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• Initialize window code Mac OS X

  - by Jarle

  I'm currently reading "the red book" for learning OpenGL properly, and in one of the first examples, the author writes a line that says "InitializeAWindowPlease();" as a place holder for the code that will make a window to draw the OpenGL content in. Since I'm using Xcode for my programing, I know that I "get" a window to work with automatically (and that I have to make my own OpenGL view in interfacebuilder). How can I make this with pure code? I'm trying to learn programming, and I'm not to happy about taking "shortcuts" all the time. How can I make a window to draw my openGL stuff in? With Objective-C and C code I would love to see it. My goal is that I can make it without opening interface builder at all:)

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