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• Reference book on Ruby on Rails social network site for novices

  - by Christopher

  Hey, so I am a novice programmer who has only worked with HTML, CSS, and a touch of Java a couple of years ago. I am looking to try to get a social network site up and running on Ruby on Rails and was looking at RailsSpace: Building a Social Networking Website with Ruby on Rails (Addison-Wesley Professional Ruby Series) - Paperback (July 30, 2007) by Michael Hartl. This was published in 2007, however, and the newer reviews say it is not very helpful. Does anyone know if there are any new publications out there that walk you through building a social network site while teaching you the code(rather than just using a out of the box program)? Thanks

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• Run exe on computer in network through batch file

  - by Peter Kottas

  I have few computers connected to the network and I want to create batch files to automatize the process of working with them. I have already created one used to shutdown computers at once. It is very simple I ll just post it for the sake of argument. @echo off shutdown -s -m \\Slave1-PC shutdown -s -m \\Slave2-PC shutdown -s -m \\Slave3-PC Now I want to execute programs on these machines. So lets say there is "example.exe" file located "\Slave1-PC\d\example.exe" using call \\Slave1-PC\\d\\example.exe runs it on my computer through network and i didn't come up with anything else. I dont want to use any psexec if possible. Help would be much appreciated. Peter

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• Does Mobile phone have Server : Port Scheme ?

  - by MilkBottle

  Hi I hope I can get all the help i can get here. I am new to mobile phone programming. I find networking very interesting and I have this question: Does Mobile phone like WinMo or other phone have Server:Port scheme and what are the ports ? To show what I mean, I use PC to demonstarte, there are many ports ( restricted and established ). The below is the Server : Port scheme Server : port example WebServer 80 So, to use a TCPListener on PC , I can use any port as long as there are not restricted and establsihed) to listen incoming TcpClient . 2) How do I use a TCPListener and Which portNo I need to use to listen incoming TcpClient from the other end in Net Compact Framework? Thanks

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• Designing a peer to peer network

  - by Varun

  I am designing a simple peer to peer network. The basic architecture will be as follows: A central server- that keeps track of all the peers. The job of this server is to keep track of all the peers that join the network. Every peer could do things: a. Download a file from it's peer b. Push a file (send a file) to it's peer. Could anybody please tell me what would be the best design for such a system? What would be the problems that i might run into and so on. I am planning to use Java as the programming language to implement. Would it be a good choice? Also, is it necessary that i would need a Linux box to develop the system? or is it fine if i use a Windows machine? Your help will be much appreciated! Thanks!

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• AIO network sockets and zero-copy under Linux

  - by remyhorton

  I have been experimenting with async Linux network sockets (aio_read et al in aio.h/librt), and one thing i have been trying to find out is whether these are zero-copy or not. Pretty much all i have read so far discusses file I/O, whereas its network I/O i am interested in. AIO is a bit of a pain to use and i suspect is non-portable, so wondering whether its worth persevering with it. Zero-copy is just about the only advantage (albiet a major one for my purposes) it would have over (non-blocking) select/epoll..

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• ruby - find and replace in a string for commonly used street suffix

  - by go minimal

  The post office actually publishes a list of commonly used street suffixes in addresses: http://www.usps.com/ncsc/lookups/abbr_suffix.txt I want to take this list and make a ruby function that takes a string, takes the last word ("183 main strt".split[' '].last) and if it matches any of the commonly used street suffixes ("strt"), replace it with the official Postal Service Standard Suffix ("st"). Is there a better way to approach this than a massive str.sub.sub.sub.sub.sub?

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• Transfer of directory structure over network

  - by singh

  I am designing a remote CD/DVD burner to address hardware constraints on my machine. My design works like this: (analogous to a network printer) Unix-based machine (acts as server) hosts a burner. Windows-based machine acts as client. Client prepares data to burn and transfers it to the server. Server burns the data on CD/DVD. My question is: what is the best protocol to transfer data over the network (Keeping the same directory hierarchy) between different operating systems?

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• Capturing network traffic on Linux

  - by Quandary

  Question: I have one Windows laptop, one Linux laptop and a wireless router. Now I want to "investigate" the hotmail/windows live protocol. What I want to do is route network traffic from the windows laptop via ethernet to the linux laptop, capture it on the Linux computer, forward it wirelessly to the router, receive the hotmail response from the router on the linux computer and forward it to the windows computer. How do I do that? In essence, switching the Linux laptop between the Windows laptop and the router, to capture network traffic ? Which program is best for capturing/analysing ? Please note that for whatever reason, packet capturing with winpcap on the windows computer doesn't work...

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• Ping or otherwise tell if a device is on the network by MAC in C#

  - by Aric TenEyck

  I'm developing a home security application. One thing I'd like to do is automatically turn it off and on based on whether or not I'm at home. I have a phone with Wifi that automatically connects to my network when I'm home. The phone connects and gets its address via DHCP. While I could configure it to use a static IP, I'd rather not. Is there any kind of 'Ping' or equivalent in C# / .Net that can take the MAC address of a device and tell me whether or not it's currently active on the network?

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• should we use services for network connections in android

  - by Anil

  Hi, should we use android services for network connection? if yes please provide me a sample.

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• can i just broadcast a specific message in my own network in python

  - by sia

  i just want to broadcast a udp message on a specific port in my network, so how can i broadcast a message in python?

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• How to detect the root recursive call?

  - by ahmadabdolkader

  Say we're writing a simple recursive function fib(n) that calculates the nth Fibonacci number. Now, we want the function to print that nth number. As the same function is being called repeatedly, there has to be a condition that allows only the root call to print. The question is: how to write this condition without passing any additional arguments, or using global/static variables. So, we're dealing with something like this: int fib(int n) { if(n <= 0) return 0; int fn = 1; if(n > 2) fn = fib(n-2) + fib(n-1); if(???) cout << fn << endl; return fn; } int main() { fib(5); return 0; } I thought that the root call differs from all children by returning to a different caller, namely the main method in this example. I wanted to know whether it is possible to use this property to write the condition and how. Update: please note that this is a contrived example that only serves to present the idea. This should be clear from the tags. I'm not looking for standard solutions. Thanks.

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• PHP: Mapped Network Drives

  - by Abs

  Hello all, I have mapped a network drive to a computer in my home network. Now I am trying to access it via PHP - I did this quick test: echo opendir('Z:\\'); This gives me: Warning: opendir(Z:\) [function.opendir]: failed to open dir: No error in C:\wamp\www\webs\tester-function.php on line 3 What have I done wrong here? I don't want my users typing in the UNC path so is there a way to get the UNC path for them and maybe that will work when I try to access it? This is possible in Microsoft languages but I am not sure how to get PHP to do this - maybe using a cmd.exe command? Please note, the mapped drive does exist as I can see it and I can access it. It also does not appear to be a permissions problem as I am assuming it would of complained about this IF it could access that drive...right? Thanks all for any help

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• Test/expand my email regex

  - by Ross

  I'm really not confident with Regex, I know some basic syntax but not enough to keep me happy. I'm trying to build a regular expression to check if an email is valid. So far here's what I've got: [A-Za-z0-9._-]+@[A-Za-z0-9]+.[A-Za-z.]+ It needs to take account of periods in the username/domain and I think it works with multiple TLDs (e.g. co.uk). I'm working with the preg engine in PHP so it needs to work with that. Thanks if you can help!

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• find all occurrences of comparison with == in visual studio

  - by Emiswelt

  Hi there I made the mistake of using == for comparing IP addresses instead of using the equals() method of the IPAddress class in C#, which will result in the comparison of references instead of values. Since the solution I am currently working on is very large for a one-man project ( 100.000 lines of source code), I am very sure that I still have some of these wrong statements in my code. Is there any possibility to tell Visual Studio to find all occurrences of == operations on a specific class for me, so that I can find and clean up the bugged comparisons? with best regards, emi

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• UITableViewController executes delate functions before network request finishes

  - by user1543132

  I'm having trouble trying to populate a UITableView with the results of a network request. It seems that my code is alright as it works perfectly when my network is speedy, however, when it's not, the function - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath- still executes, which results in a bad access error. I presume that this is because the array that the aforesaid function attempts to utilize has not been populated. This brings me to my question: Is there anyway that I can have the UITableView delegate methods delayed to avoid this? - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"AlbumsCell"; //UITableViewCell *basicCell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]; AlbumsCell *cell = (AlbumsCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (!cell) { **// Here is where the Thread 1: EXC_BAD_ACCESS (code=2 address=0x8)** cell = [[[AlbumsCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } Album *album = [_albums objectAtIndex:[indexPath row]]; [cell setAlbum:album]; return cell; }

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• Network license control for a Java application

  - by user1461615

  I have been tasked with providing some form of network license control for a Java application. The app would be stored on a network drive and run from a client machine. The basic idea is that it will be able to work out how many times it is being run concurrently and prevent the N+1th user from running the software where N is the number of concurrent licenses the customer has purchased. Is this possible somehow with a Java application? I implemented a "solution" which relied on multi-cast UDP communication between the running instances of the application but this didn't work because on most networks this kind of communication is blocked by security measures. Is there a better way? I don't even mind if it requires JNI/JNA. N.B. The solution does not have to be that sophisticated or highly secure.

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• .net File.Copy very slow when copying many small files (not over network)

  - by Guavaman

  I'm making a simple folder sync backup tool for myself and ran into quite a roadblock using File.Copy. Doing tests copying a folder of ~44,000 small files (Windows mail folders) to another drive in my system, I found that using File.Copy was over 3x slower than using a command line and running xcopy to copy the same files/folders. My C# version takes over 16+ minutes to copy the files, whereas xcopy takes only 5 minutes. I've tried searching for help on this topic, but all I find is people complaining about slow file copying of large files over a network. This is neither a large file problem nor a network copying problem. I found an interesting article about a better File.Copy replacement, but the code as posted has some errors which causes problems with the stack and I am nowhere near knowledgeable enough to fix the problems in his code. Are there any common or easy ways to replace File.Copy with something more speedy?

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• [python] voice communication for python help!

  - by Eric

  Hello! I'm currently trying to write a voicechat program in python. All tips/trick is welcome to do this. So far I found pyAudio to be a wrapper of PortAudio. So I played around with that and got an input stream from my microphone to be played back to my speakers. Only RAW of course. But I can't send RAW-data over the netowrk (due the size duh), so I'm looking for a way to encode it. And I searched around the 'net and stumbled over this speex-wrapper for python. It seems to good to be true, and believe me, it was. You see in pyAudio you can set the size of the chunks you want to take from your input audiobuffer, and in that sample code on the link, it's set to 320. Then when it's encoded, its like ~40 bytes of data per chunk, which is fairly acceptable I guess. And now for the problem. I start a sample program which just takes the input stream, encodes the chunks, decodes them and play them (not sending over the network due testing). If I just let my computer idle and run this program it works great, but as soon as I do something, i.e start Firefox or something, the audio input buffer gets all clogged up! It just grows and then it all crashes and gives me an overflow error on the buffer.. OK, so why am I just taking 320 bytes of the stream? I could just take like 1024 bytes or something and that will easy the pressure on the buffer. BUT. If I give speex 1024 bytes of data to encode/decode, it either crashes and says that thats too big for its buffer. OR it encodes/decodes it, but the sound is very noisy and "choppy" as if it only encoded a tiny bit of that 1024 chunk and the rest is static noise. So the sound sounds like a helicopter, lol. I did some research and it seems that speex only can convert 320 bytes of data at time, and well, 640 for wide-band. But that's the standard? How can I fix this problem? How should I construct my program to work with speex? I could use a middle-buffer tho that takes all available data to read from the buffer, then chunk this up in 320 bits and encode/decode them. But this takes a bit longer time and seems like a very bad solution of the problem.. Because as far as I know, there's no other encoder for python that encodes the audio so it can be sent over the network in acceptable small packages, or? I've been googling for three days now. Also there is this pyMedia library, I don't know if its good to convert to mp3/ogg for this kind of software. Thank in in advance for reading this, hope anyone can help me! (:

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• How to stop IIS7 from listening on a specific IP address and port?

  - by webworm

  I am trying to install Apache on Windows Server 2008. The installation ends with a warning that the IP address I configured Apache to listen on cannot be bound. When I use netstat -a -p tcp to see if any processes are listening on the IP address and port I see several entires .. one of which shows as listening on 0.0.0.0:80. Here is a partial list of the output. Proto Local Address Foreign Address State TCP 0.0.0.0:80 MYSERVERNAME:0 LISTENING This looks to be IIS7 listening on all IP addresses on port 80. The confusing thing is that I stopped IIS7. All websites are shown as stopped. I tried iisreset /STOP as well as using the IIS7 Manager, yet something is still listening on 0.0.0.0:80. I have even made sure that every web site is bound to another IP address other than the one I want freed for Apache. Has anyone else run into this?

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• why do Vagrant docs suggest using public IP address 33.33.33.10 for local VMs?

  - by Gert

  I'm following a tutorial to set up vagrant (a tool to build and configure portable virtual machine images), and it seems that vagrant documentation suggests using IPv4 address 33.33.33.10 to configure a new box. That is a publicly routed IP adress, so I'm a bit confused why using this address is suggested. Since I don't own this network, I should not use an address from the 33.33.33.10/8 range. Am I correct in thinking that I should only use either a public address from a network I own, or an address from one of the private ranges as defined in RFC 1918? If so, why does Vagrant documentation suggest otherwise?

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• Sporadic name resolution failure happening on web service call

  - by ansleygal

  One of our wcf service applications calls a seperate third party web service to submit information. We are getting the following error every so often, but not all the time: System.Net.WebException: The remote name could not be resolved: 'ws.examplesite.net' at System.Net.HttpWebRequest.GetRequestStream() at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) The wierd thing is that after the error happens, we can hit "Submit" again a second later and it will go through just fine. We have checked and double checked with our network guys and they have confirmed that DNS is correct, and they have done multiple nslookups in a row to confirm. This is happening in all environments (dev, test and prod). We use the third party test and prod urls, and it is happening when we point to both. Does anyone have any other trouble shooting techniques for this or any reason this would happen? Much thanks, ~Ansley

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• raw h.264 packet capture and playing in VLC

  - by MAC

  Hi, I am capturing packets off the network from a video conference HDX. The video is sent in RTP and is encoded in H264. I am trying to capture these packets and generate a video file. I wrote raw H264 data from the packets to disk and i am trying to play it in VLC. VLC just shows a green box. Am i being too naive in my approach with data writing or should am I wrong in assuming that VLC should play this file? Anyone have any experience in such things?

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• Regarding to get refrence of IDot11AdHocManager Interface of COM WiFi AdHoc manager Interface

  - by sathaliyawala

  I am Trying to create AdHoc connection and for this i am using AdHoc wifi Interface provided by Microsoft. I have written code :- IDot11AdHocManager *pIAdHocMng = NULL ; HRESULT hr = CoInitialize(NULL); hr = CoCreateInstance(CLSID_Dot11AdHocManager,NULL,CLSCTX_INPROC_HANDLER ,IID_IDot11AdHocManager ,(void**)pIAdHocMng); if(hr == S_OK) printf("CreateNetwork Method success due to following reason :\n %ld",hr) ; else printf("CreateNetwork Method fail due to following reason : %ld \n ",hr) ; getch(); CoUninitialize(); But it will not return reference of Dot11AdHocManager it will return error and NULL value please help me to get the reference of Dot11AdHocManager Interface so i can use it method which help me to create the AdHoc Network

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• Android Emulator starting in Flight-Mode

  - by Andhravaala

  Hi All, I have a small issue. I am running my application in emulator. For that it requires Network to simulate some traffic. But sometimes, on start-up my emulator is starting in Flight Mode. I am did not found any flags or settings to make it not to go to Flight-Mode. Can any one help me, if come across similar problem. Note: It is not a trivial issue, but it is making work difficult to start the emulator multiple times.

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