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• How do I make a TCP server work behind a router (NAT) without any redirection configuration needed.

  - by Chetane

  The scenario is the following. I have two machines A and B: A: Client (behind NAT) B: Server (behind NAT) I want B to be able to listen on any given port, so that A can send packets to B through that specific TCP port and receive any response. If both machines are not behind a NAT it is pretty straight foward process. However how do I make it work so that it works even when B is behind a router, without him having to go change the router configuration enable some port forwarding etc... For example, how do p2p program like torrent clients work without the user having anything to configure? Thanks and I hope my question is clear enough.

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• Programming Quiz [closed]

  - by arin-s-rizk

  Hi one of my mates sent me this quiz see if you can guess the answers I will post mine later. In this quiz, some tasks related to the compilation process are listed. For each one of them, specify the part of the compiler that is responsible of performing it. Here are the possible answers: Lexical analyzer Parser Semantic analyzer None of the above Just fill the right choice (the number only) in the blank after each task: Checking that the parentheses in an expression are balanced _ _ _ _ _ Removing comments from the program _ _ _ _ _ Grouping input characters into "tokens" _ _ _ _ _ Reporting an error to the programmer about a missing (;) at the end of a C++ statement _ _ _ _ _ Checking if the type of the RHS (Right-Hand Side) of an assignment (=) is compatible with the LHS (Left-Hand Side) variable _ _ _ _ _ Converting the (AST) Abstract Syntax Tree into machine language _ _ _ _ _ Reporting an error about a strange character like '^' in a C++ program _ _ _ _ _ Optimizing the AST _ _ _ _ _

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• Take advantage of multiple cores executing SQL statements

  - by willvv

  I have a small application that reads XML files and inserts the information on a SQL DB. There are ~ 300 000 files to import, each one with ~ 1000 records. I started the application on 20% of the files and it has been running for 18 hours now, I hope I can improve this time for the rest of the files. I'm not using a multi-thread approach, but since the computer I'm running the process on has 4 cores I was thinking on doing it to get some improvement on the performance (although I guess the main problem is the I/O and not only the processing). I was thinking on using the BeginExecutingNonQuery() method on the SqlCommand object I create for each insertion, but I don't know if I should limit the max amount of simultaneous threads (nor I know how to do it). What's your advice to get the best CPU utilization? Thanks

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• What is the reliable way to return error code from an MPI program?

  - by mezhaka

  The MPI standard (page 295) says: Advice to users. Whether the errorcode is returned from the executable or from the MPI process startup mechanism (e.g., mpiexec), is an aspect of quality of the MPI library but not mandatory. Indeed I had no success in running the following code: if(0 == my_rank) { FILE* parameters = fopen("parameters.txt", "r"); if(NULL == parameters) { fprintf(stderr, "Could not open parameters.txt file.\n"); printf("Could not open parameters.txt file.\n"); exit(EXIT_FAILURE); //Tried MPI_Abort() as well } fscanf(parameters, "%i %f %f %f", N, X_DIMENSION_Dp, Y_DIMENSION_Dp, HEIGHT_DIMENSION_Dp); fclose(generation_conf); } I am not able to get the error code back into the shell in order to make a decision on further actions. Neither of two error messages are printed. I think I might write the error codes and messages to a dedicated file. Has anyone ever had a similar problem and what were the options you've considered to do a reliable error reporting?

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• Final Integration Testing for Q.A.

  - by CalebHC

  A medium sized rails app that our company has been working on is getting close to the end of development and we are going to start doing Q.A. testing on it. We've have been writing unit, functional and integration tests all along and our test coverage is about 99% (even though that really doesn't mean anything). We feel like we have a pretty good test suite but I was wondering if we should be writing final integration tests for every little action we are going to do during our Q.A. process. If so, would using Shoulda or Cucumber be a good idea? We haven't used either of those testing tools yet, but they sound really great. Any ideas or thoughts would be really helpful. Thanks

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• Windows7 explorer context strip hook?

  - by aceman

  Hy everybody, I'm wondering if it's possible to add a new button via C++ or C# to windows 7 explorer "context strip"(don't know if this is correct name) - like on picture below. My reason for this is because a lot of times I'm switching on&off "Show hidden files, folders and drives" functionality under Tools-Folder option-View. Therefore i want to simplify this process with a click of a button. I was looking into ShellExecteEx function, but I am not sure I can do that. Can Anybody direct me in right direction? thanks, regards

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• MPI_Bsend and MPI_Isend. How do they work ?

  - by GBBL

  Hi, using buffered send and non blocking send I was wondering how and if they implement a new level of parallelism in my application eventually generating a thread. Imagine that a slave process generates a large amount of data and want to send it to the master. My idea was to start a buffered or non blocking send then immediately begin to compute the next result. Just when I would have to send the new data I wold check if I can reuse the buffer. This would introduce a new level of parallelism in my application between CPU and communication. Does anybody knows how this is done in MPI ? Does MPI generate a new thread to handle the Bsend or Isend ? Thanks.

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• What can cause Java to keep running after System.exit()?

  - by uckelman

  I have a Java program which is being started via ProcessBuilder from another Java program. System.exit(0) is called from the child program, but for some of our users (on Windows) the java.exe process associated with the child doesn't terminate. The child program has no shutdown hooks, nor does it have a SecurityManager which might stop System.exit() from terminating the VM. I can't reproduce the problem myself on Linux or Windows Vista. So far, the only reports of the problem come from two Windows XP users and one Vista user, using two different JREs (1.6.0_15 and 1.6.0_18), but they're able to reproduce the problem every time. Can anyone suggest reasons why the JVM would fail to terminate after System.exit(), and then only on some machines?

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• What happens if the first part of an if-structure is false?

  - by djerry

  Hey guys, I was wondering what happens when a program processes an if-structure with multiple conditions. I have an idea, but i'm not sure about it. I'll give an example : List<string> myTestList = null; if (myTestList != null && myTestList.Count > 0) { //process } The list is null. When processing the if, will it go from left to right exiting the if as soon as one condition is false? I've tried it and seems to throw no errors, so i assume the above explains it, but i'm not sure. Thanks in advance.

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• Do (statically linked) DLLs use a different heap than the main program?

  - by happy_emi

  I'm new to Windows programming and I've just "lost" two hours hunting a bug which everyone seems aware of: you cannot create an object on the heap in a DLL and destroy it in another DLL (or in the main program). I'm almost sure that on Linux/Unix this is NOT the case (if it is, please say it, but I'm pretty sure I did that thousands of times without problems...). At this point I have a couple of questions: 1) Do statically linked DLLs use a different heap than the main program? 2) Is the statically linked DLL mapped in the same process space of the main program? (I'm quite sure the answer here is a big YES otherwise it wouldn't make sense passing pointers from a function in the main program to a function in a DLL). I'm talking about plain/regular DLL, not COM/ATL services EDIT: By "statically linked" I mean that I don't use LoadLibrary to load the DLL but I link with the stub library

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• How can I efficiently retrieve a large number of database settings as PHP variables?

  - by Steven

  Currently all of my script's settings are located in a PHP file which I 'include'. I'm in the process of moving these settings (about 100) to a database table called 'settings'. However I'm struggling to find an efficient way of retrieving all of them into the file. The settings table has 3 columns: ID (autoincrements) name value Two example rows might be: 1 admin_user john 2 admin_email_address [email protected] The only way I can think of retrieving each setting is like this: $result = mysql_query("SELECT value FROM settings WHERE name = 'admin_user'"); $row = mysql_fetch_array($result); $admin_user = $row['value']; $result = mysql_query("SELECT value FROM settings WHERE name = 'admin_email_address'"); $row = mysql_fetch_array($result); $admin_email_address = $row['value']; etc etc Doing it this way will take up a lot of code and will likely be slow. Is there a better way? Thanks.

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• Hold the command prompt until user close it from close button.

  - by Kasun

  Hi, I going to get the command prompt from my C# application to compile some C++ files. Code is like this. private void button1_Click(object sender, EventArgs e) { string filePath = @"C:\Program Files\Microsoft Visual Studio 9.0\VC\bin\cl.exe"; System.Diagnostics.Process.Start(filePath); } But After i click the button it suddenly comes and disappear. Even its opening two command prompts. I need to Hold it and only one command prompt should appear. Can some one provide me the necessary codes. Thank you.

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• create temporary table from cursor

  - by Claudiu

  Is there any way, in PostgreSQL accessed from Python using SQLObject, to create a temporary table from the results of a cursor? Previously, I had a query, and I created the temporary table directly from the query. I then had many other queries interacting w/ that temporary table. Now I have much more data, so I want to only process 1000 rows at a time or so. However, I can't do CREATE TEMP TABLE ... AS ... from a cursor, not as far as I can see. Is the only thing to do something like: rows = cur.fetchmany(1000); cur2 = conn.cursor() cur2.execute("""CREATE TEMP TABLE foobar (id INTEGER)""") for row in rows: cur2.execute("""INSERT INTO foobar (%d)""" % row) or is there a better way? This seems awfully inefficient.

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• Under Windows CE, how can I check which RAM based DLLs are loaded in virtual memory space?

  - by Michal Drozdowicz

  I have a problem with loading a DLL under Windows Mobile 5.0. I'm pretty confident that this is caused by running out of the application virtual memory (the 32 MB slot of the process, as explained in Windows CE .NET Advanced Memory Management). I'm looking for a way to actually make sure that this is the issue and investigate whether my efforts bring expected results. Do you know of a way to check the contents of the virtual memory application slot? Any applications that can help me with this task?

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• Checking validation errors in XMLHttpRequest

  - by egaga

  $.post(actionUrl, serializedForm, function(response) { ... } I need to check whether validation of form succeeded, or not (I don't need to know the exact validation errors). The validation is done by Spring, and I wouldn't like to interfere the process, because there's some annoying dependencies. What would be the best approach? Is there a Spring error object in response, or is it accessible only in server side? I would also like to know if there's is any proper documentation about response in jQuery site? How can I traverse or manipulate it?

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• uploading app problem in developers site

  - by Siva K

  hi i have posted one of my app in market.android.com when i am trying to post second app it shows "You have another application on Market with the same package name. Go to that other application, and click upgrade" I dont want to upgrade it but i want my second app to be posted. When i tried to change the package name it showed lots of errors, so i decided to create the app once again in a new package and project name, it seems to be a very lengthy process.... pls help me to solve the issue bcoz i have created all my app in same package name unknowingly.......

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• How to add the UAC shield icon to program that still must target XP?

  - by bsruth

  I have a program that still must target Windows XP (_WIN32_WINNT 0x501), as most of our customers still use XP. However, we have been shipping Vista for a while, and are now pushing Windows 7 upgrades. For the software to work correctly on the newer OSs, there are a couple operations that require UAC elevation. I have the elevation code working, but would like to have the UAC icon present on the buttons that launch the UAC process. Unfortunately, all of the options defined in Microsoft's UAC UI document require _WIN32_WINNT 0x600 or newer. Is there any way to get the appropriate UAC icon (Vista and 7 use different ones) to show on the button while still being able to target XP (where no icon will be shown)? I'm using C++, but may be able to adapt a .NET solution.

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• How do you increase Internet Explorer 7's "Select as you type" timeout for comboboxes?

  - by Iain Fraser

  In Internet Explorer 7, you can select options from comboboxes by typing the first few letters of the value you're looking for. However, some people in our organisation are a bit slow and can't type their selection quick enough, with the result that the timeout is triggered and the "select as you type" process starts all over again. Example: If I type A-R-M-A (looking for Armadale) then wait half a second and type D, I'll get selections beginning with the letter D. What I want to do is increase this timeout to allow for slow typers. (We're in a corporate environment so rolling out these changes to all machines won't be a problem).

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• C# connectionString encryption questions

  - by 5YrsLaterDBA

  I am learning how to encrypt the ConnectionString for our C# (3.5) Application. I read the .Net Framwork Developer Guide (http://msdn.microsoft.com/en-us/library/89211k9b(VS.80).aspx) about securing connection string. but not fully understand the contents. It says "The connection string can only be decrypted on the computer on which it was encrypted." We have a release machine which will build our application which will generate the OurApp.exe.config and then install it to many product machines. Is that meam we have to have this encryption process separated with our application and run it at individual product machine? We may use the "RSAProtectedConfigurationProvider". It mentioned we need encryption key for that provider. when and how we should provide the encryption key? thanks,

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• Is it possible to talk to the iPhone simulator/device.

  - by Plumenator

  I need to automate the build/deploy process for my iphone applications from a script. I can use xcodebuild to build the project, then use Applescript to deploy and debug/run the application. Assuming the application will stop by itself after a while, I need to collect the generated logs for verification. But the problem is I have no way to know when the application ended from outside of the application itself. If the running time is fixed, I can again use Applescript to stop the application (Cmd+Shift+Enter). So there has to be a way to connect to the device/simulator and wait on the application somehow.

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• Scripting vim to Run Perltidy on a Buffer

  - by rjray

  At my current job, we have coding-style standards that are different from the ones I normally follow. Fortunately, we have a canned RC file for perltidy that I can apply to reformat files before I submit them to our review process. I have code for emacs that I use to run a command over a buffer and replace the buffer with the output, which I have adapted for this. But I sometimes alternate between emacs and vim, and would like to have the same capabilities there. I'm sure that this or something similar is simple and had been done and re-done many times over. But I've not had much luck finding any examples of vim-script that seem to do what I need. Which is, in essence, to be able to hit a key combo (like Ctrl-F6, what I use in emacs) and have the buffer be reformatted in-place by perltidy. While I'm a comfortable vim-user, I'm completely clueless at writing this sort of thing for vim.

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• HELP! need to make a VoIP program for WiMAX in NS-2 work..

  - by janiemack

  I've been trying to get this working for the past 2 days and i'm completely stuck. I'm trying to make a simple VoIP program work in the NIST module for WiMAX http ://community.4gdeveloper.com/attachments/download/14/090720150504_ns2-Release-2.6.tar.gz version 2.6 , using NS-2.31 (remove space btw 'p' and ':' ) http ://downloads.sourceforge.net/nsnam/ns-allinone-2.31.tar.gz?modtime=1173548159&big_mirror=0 (remove space btw 'p' and ':' ) The installation process goes fine. When i run this program, I'm getting an error saying " OFDMAPhy : error did not find match for permutation and bw combination" Some help would be really appreciated. thanks!

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• Quick way to get an NSDictionary from an XML NSData representation?

  - by dontWatchMyProfile

  I've loaded an XML file as NSData into memory and parse over the elements using NSXMLParser. Although it works, it's a very ugly and hard to maintain code since there are about 150 different elements to parse. I know there are nice third-party solutions, but I want to keep it with the iPhone SDK for purpose of practice and fun. So I thought: Why not convert that XML file into an NSDictionary? Having this, I could use fast enumeration to go over the elements. Or is it just the same amount of ugly code needed to parse and process an XML right away with NSXMLParser? Would I build up an NSDictionary for every found node in the XML and create a huge one, containing the whole structure and data? Or is there an even simpler way?

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• Scrool Bar - Help

  - by 3gwebtrain

  Hi, any one can help in this?, i want to make a scroll bar to scroll the li underneath a div. in which i made a ui, scroller, but client want the front and back arrow to adjust the slides. like regular scroll bar like browser. please visit ; http://ikeafamilylive.com/stories/60 and you will witness what i request. And please don't recommend me a plug-in, because i need to use this scroll bar across the site with several customization process. please give me the sample code / suggestion to make a scroll bar using jquery+css. with full functionality.

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• content management system

  - by Farax

  I am building a website for a client who needs a content management system to go with it. The client requires features such as content staging, approving process before publishing a page, provision for templates (changing which changes the lay out for the whole website), entry and expiry dates for pages and content search. I am planning to use an existing opensource CMS for the work but I am confused as to which one should it be. I need help in deciding whether this approach is good or should i develop my own CMS? and if I do use an opensource one, which one is extensible and customisable enough using .NET?

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