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• getting detailed information about structured exceptions

  - by Martin

  My Visual C++ application is compiled with /EHA option, letting me catch structured exceptions (division by zero, access violation, etc). I then translate those exceptions to my own exception class using _set_se_translator(). My goal is to improve our logging of those types of exceptions. I can get the type of exception from the EXCEPTION_RECORD structure, and the exception address. I would like to be able to gather more information, like the source file/location where the exception is thrown, the call stack, etc. Is that possible? I do create an exception minidump on structured exceptions - is there a tool to automatically get the call stack from that?

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• Windows Impersonation failed

  - by skprocks

  I am using following code to implement impersonation for the particular windows account,which is failing.Please help. using System.Security.Principal; using System.Runtime.InteropServices; public partial class Source_AddNewProduct : System.Web.UI.Page { [DllImport("advapi32.dll", SetLastError = true)] static extern bool LogonUser( string principal, string authority, string password, LogonSessionType logonType, LogonProvider logonProvider, out IntPtr token); [DllImport("kernel32.dll", SetLastError = true)] static extern bool CloseHandle(IntPtr handle); enum LogonSessionType : uint { Interactive = 2, Network, Batch, Service, NetworkCleartext = 8, NewCredentials } enum LogonProvider : uint { Default = 0, // default for platform (use this!) WinNT35, // sends smoke signals to authority WinNT40, // uses NTLM WinNT50 // negotiates Kerb or NTLM } //impersonation is used when user tries to upload an image to a network drive protected void btnPrimaryPicUpload_Click1(object sender, EventArgs e) { try { string mDocumentExt = string.Empty; string mDocumentName = string.Empty; HttpPostedFile mUserPostedFile = null; HttpFileCollection mUploadedFiles = null; string xmlPath = string.Empty; FileStream fs = null; StreamReader file; string modify; mUploadedFiles = HttpContext.Current.Request.Files; mUserPostedFile = mUploadedFiles[0]; if (mUserPostedFile.ContentLength >= 0 && Path.GetFileName(mUserPostedFile.FileName) != "") { mDocumentName = Path.GetFileName(mUserPostedFile.FileName); mDocumentExt = Path.GetExtension(mDocumentName); mDocumentExt = mDocumentExt.ToLower(); if (mDocumentExt != ".jpg" && mDocumentExt != ".JPG" && mDocumentExt != ".gif" && mDocumentExt != ".GIF" && mDocumentExt != ".jpeg" && mDocumentExt != ".JPEG" && mDocumentExt != ".tiff" && mDocumentExt != ".TIFF" && mDocumentExt != ".png" && mDocumentExt != ".PNG" && mDocumentExt != ".raw" && mDocumentExt != ".RAW" && mDocumentExt != ".bmp" && mDocumentExt != ".BMP" && mDocumentExt != ".TIF" && mDocumentExt != ".tif") { Page.RegisterStartupScript("select", "<script language=" + Convert.ToChar(34) + "VBScript" + Convert.ToChar(34) + "> MsgBox " + Convert.ToChar(34) + "Please upload valid picture file format" + Convert.ToChar(34) + " , " + Convert.ToChar(34) + "64" + Convert.ToChar(34) + " , " + Convert.ToChar(34) + "WFISware" + Convert.ToChar(34) + "</script>"); } else { int intDocLen = mUserPostedFile.ContentLength; byte[] imageBytes = new byte[intDocLen]; mUserPostedFile.InputStream.Read(imageBytes, 0, mUserPostedFile.ContentLength); //xmlPath = @ConfigurationManager.AppSettings["ImagePath"].ToString(); xmlPath = Server.MapPath("./../ProductImages/"); mDocumentName = Guid.NewGuid().ToString().Replace("-", "") + System.IO.Path.GetExtension(mUserPostedFile.FileName); //if (System.IO.Path.GetExtension(mUserPostedFile.FileName) == ".jpg") //{ //} //if (System.IO.Path.GetExtension(mUserPostedFile.FileName) == ".gif") //{ //} mUserPostedFile.SaveAs(xmlPath + mDocumentName); //Remove commenting till upto stmt xmlPath = "./../ProductImages/"; to implement impersonation byte[] bytContent; IntPtr token = IntPtr.Zero; WindowsImpersonationContext impersonatedUser = null; try { // Note: Credentials should be encrypted in configuration file bool result = LogonUser(ConfigurationManager.AppSettings["ServiceAccount"].ToString(), "ad-ent", ConfigurationManager.AppSettings["ServiceAccountPassword"].ToString(), LogonSessionType.Network, LogonProvider.Default, out token); if (result) { WindowsIdentity id = new WindowsIdentity(token); // Begin impersonation impersonatedUser = id.Impersonate(); mUserPostedFile.SaveAs(xmlPath + mDocumentName); } else { throw new Exception("Identity impersonation has failed."); } } catch { throw; } finally { // Stop impersonation and revert to the process identity if (impersonatedUser != null) impersonatedUser.Undo(); // Free the token if (token != IntPtr.Zero) CloseHandle(token); } xmlPath = "./../ProductImages/"; xmlPath = xmlPath + mDocumentName; string o_image = xmlPath; //For impersoantion uncomment this line and comment next line //string o_image = "../ProductImages/" + mDocumentName; ViewState["masterImage"] = o_image; //fs = new FileStream(xmlPath, FileMode.Open, FileAccess.Read); //file = new StreamReader(fs, Encoding.UTF8); //modify = file.ReadToEnd(); //file.Close(); //commented by saurabh kumar 28may'09 imgImage.Visible = true; imgImage.ImageUrl = ViewState["masterImage"].ToString(); img_Label1.Visible = false; } //e.Values["TemplateContent"] = modify; //e.Values["TemplateName"] = mDocumentName.Replace(".xml", ""); } } catch (Exception ex) { ExceptionUtil.UI(ex); Response.Redirect("errorpage.aspx"); } } } The code on execution throws system.invalidoperation exception.I have provided full control to destination folder to the windows service account that i am impersonating.

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• Wake OSX 10.8 over WiFi (WoWL - Wake on WiFi Lan)

  - by WrinkledCheese

  I have a stack of Apple Mac minis running SSH servers for remote login. The problem is that I can't seem to get them to wake up. From what I gathered, as of Mac OSX 10.7 you required to have a boot time option set - darkwake=0 10.7 and darkwake=no 10.8. So I tried this and then I came to the realization that this will probably work for a wired connection but I'm using WiFi. My wired connections are used for another local subnet without Internet access, so I have to get it to wake on WiFi. I realize that I can just set the stack of Mac minis to just not sleep, but I'm looking for a sleep enabled option. These services don't require initial response speed as once the connection is made they will be active and once they are no longer active they will hopefully go back to sleep. I have a FreeBSD box running avahi-daemon in order to try and wake the Macs with the Bonjour Service but it doesn't seem to work. I tried registering the service as Gordon suggested in the below post, but that just makes it so that there isn't a timeout when discovering services and resolving them. It still doesn't allow ssh connections to port 22 when it's asleep. For reference, I want what seems like what Gordon Davisson explained on this question: Wake on Demand for Apache server in OS X 10.8

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• Is there any reason to throw a DivideByZeroException?

  - by Atomiton

  Are there any cases when it's a good idea to throw errors that can be avoided? I'm thinking specifically of the DivideByZeroException and NullReferenceException For example: double numerator = 10; double denominator = getDenominatorFromUser(); if( denominator == 0 ){ throw new DivideByZeroException("You can't divide by Zero!"); } Are there any reasons for throwing an error like this? NOTE: I'm not talking about catching these errors, but specifically in knowing if there are ever good reasons for throwing them.

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• Socket Select with empty fd set

  - by whoi

  Hi; Suppose you have an fd set which can have zero or more sockets in it. When I try to call select operation on empty fd set, what I get is -1 as the number of fds which are set, meaning error. So what would you suggest to overcome this problem, you might say do not call if empty but I have a loop and any time fd set can hold 0 or more sockets. What is the best approach about this problem? (we are on C programming language)

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• Java Math.cos() Method Does Not Return 0 When Expected

  - by dimo414

  Using Java on a Windows 7 PC (not sure if that matters) and calling Math.cos() on values that should return 0 (like pi/2) instead returns small values, but small values that, unless I'm misunderstanding, are much greater than 1 ulp off from zero. Math.cos(Math.PI/2) = 6.123233995736766E-17 Math.ulp(Math.cos(Math.PI/2)) = 1.232595164407831E-32 Is this in fact within 1 ulp and I'm simply confused? And would this be an acceptable wrapper method to resolve this minor inaccuracy? public static double cos(double a){ double temp = Math.abs(a % Math.PI); if(temp == Math.PI/2) return 0; return Math.cos(a); }

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• JavaScript distributed computing project

  - by Ben L.

  I made a website that does absolutely nothing, and I've proven to myself that people like to stay there - I've already logged 11+ hours worth of cumulative time on the page. My question is whether it would be possible (or practical) to use the website as a distributed computing site. My first impulse was to find out if there were any JavaScript distributed computing projects already active, so that I could put a piece of code on the page and be done. Unfortunately, all I could find was a big list of websites that thought it might be a cool idea. I'm thinking that I might want to start with something like integer factorization - in this case, RSA numbers. It would be easy for the server to check if an answer was correct (simply test for modulus equals zero), and also easy to implement. Is my idea feasible? Is there already a project out there that I can use?

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• Which MAC address is the right one?

  - by Paul Dinh

  Result by 'getmac': C:\>getmac Physical Address Transport Name =================== ========================================================== 72-03-C6-48-59-34 \Device\Tcpip_{8AEB3263-18C4-449E-A80F-BC2541DDC2A9} 00-21-9B-D5-6F-EE \Device\Tcpip_{C2F9CE19-D68F-4105-9766-45CBE6D82331} 00-22-68-D2-9B-F7 \Device\Tcpip_{A2701130-9221-43FE-8F14-7B1114F84DC3} Result by 'ipconfig /all': C:\>ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : xps-m1530 Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Mixed IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Ethernet adapter Wireless Network Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Dell Wireless 1395 WLAN Mini-Card Physical Address. . . . . . . . . : 00-22-68-D2-9B-F7 Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes Autoconfiguration IP Address. . . : 169.254.246.4 Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Marvell Yukon 88E8040 PCI-E Fast Eth ernet Controller Physical Address. . . . . . . . . : 00-21-9B-D5-6F-EE Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 192.168.1.112 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1 DHCP Server . . . . . . . . . . . : 192.168.1.1 DNS Servers . . . . . . . . . . . : 8.8.8.8 8.8.4.4 Lease Obtained. . . . . . . . . . : 01 November 2012 9:00:36 AM Lease Expires . . . . . . . . . . : 04 November 2012 9:00:36 AM There is a MAC address on the back of my laptop, but the sticker is no longer there. So I use the 'getmac' command to get the MAC addresses. But which address shown by 'getmac' above is the one matching the MAC in the sticker on the back of my laptop? Or am I mistaken something? 00-21-... is the ethernet adapter, 00-22-... is the wireless adapter, and 72-03-... is what?

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• SoundPool repeating issue for Samsung Galaxy S3

  - by Alaa Eldin

  I'm trying to play a background sound for my application, I use SoundPool class, my problem is that, sound plays well only when I set the loop parameter with zero value, but it doesn't work for any other value. My code for initialization is: soundpool = new SoundPool(4, AudioManager.STREAM_MUSIC, 0); soundsMap = new HashMap<Integer, Integer>(); soundsMap.put(1, soundpool.load(this, R.raw.soundfile_1, 1)); soundsMap.put(2, soundpool.load(this, R.raw.soundfile_2, 1)); my code for playing is soundpool.play(1, 0.9f, 0.9f, 1, -1, 1f); as I mentioned sound works when I put (0) instead of (-1) for the loop value, anyone has any idea why (-1) or any value other than (0) doesn't work (there is no output sound) ?

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• Virtual Machine Network Architecture, Isolating Public and Private Networks

  - by Mark

  I'm looking for some insight into best practices for network traffic isolation within a virtual environment, specifically under VMWARE ESXi. Currently I have (in testing) 1 hardware server running ESXi but i expect to expand this to multiple pieces of hardware. The current setup is as follows: 1 pfsense VM, this VM accepts all outside (WAN/internet) traffic and performs firewall/port forwarding/NAT functionality. I have multiple public IP addresses sent to the this VM that are used for access to individual servers (via per incoming IP port forwarding rules). This VM is attached to the private (virtual) network that all other VMs are on. It also manages a VPN link into the private network with some access restrictions. This isn't the perimeter firewall but rather the firewall for this virtual pool only. I have 3 VMs that communicate with each other, as well as have some public access requirements: 1 LAMP server running an eCommerce site, public internet accessible 1 accounting server, access via windows server 2008 RDS services for remote access by users 1 inventory/warehouse management server, VPN to client terminals in warehouses These servers constantly talk with each other for data synchronization. Currently all the servers are on the same subnet/virtual network and connected to the internet through the pfsense VM. The pfsense firewall uses port forwarding and NAT to allow outside access to the servers for services and for server access to the internet. My main question is this: Is there a security benefit to adding a second virtual network adapter to each server and controlling traffic such that all server to server communication is on one separate virtual network, while any access to the outside world is routed through the other network adapter, through the firewall, and on the the internet. This is the type of architecture i would use if these were all physical servers, but i'm unsure if the networks being virtual changes the way i should approach locking down this system. Thank you for any thoughts or direction to any appropriate literature.

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• Globbing with MinGW on Windows

  - by Neil Butterworth

  I have an application built with the MinGW C++ compiler that works something like grep - acommand looks something like this: myapp -e '.*' *.txt where the thing that comes after the -e switch is a regex, and the thing after that is file name pattern. It seems that MinGW automatically expands (globs in UNIX terms) the command line so my regex gets mangled. I can turn this behaviour off, I discovered, by setting the global variable _CRT_glob to zero. This will be fine for bash and other sensible shell users, as the shell will expand the file pattern. For MS cmd.exe users however, it looks like I will have to expand the file pattern myself. So my question - does anyone know of a globbing library (or facility in MinGW) to do partial command line expansion? I'm aware of the _setargv feature of the Windows CRT, but that expands the full command line. Please note I've seen this question, but it really does not address partial expansion.

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• How can I work around the fact that in C++, sin(3.14159265) is not 0?

  - by Adam Doyle

  In C++, const double Pi = 3.14159265; cout << sin(Pi); // displays: 3.58979e-009 it SHOULD display the number zero I understand this is because Pi is being approximated, but is there any way I can have a value of Pi hardcoded into my program that will return 0 for sin(Pi)? (a different constant maybe?) In case you're wondering what I'm trying to do: I'm converting polar to rectangular, and while there are some printf() tricks I can do to print it as "0.00", it still doesn't consistently return decent values (in some cases I get "-0.00") The lines that require sin and cosine are: x = r*sin(theta); y = r*cos(theta); BTW: My Rectangular - Polar is working fine... it's just the Polar - Rectangular Thanks! edit: I'm looking for a workaround so that I can print sin(some multiple of Pi) as a nice round number to the console (ideally without a thousand if-statements)

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• "Safe" personal router use on apartment-wide network

  - by noisetank

  I recently moved into an apartment with internet included in my rent. This was a boon at first, but now I'm feeling limited. To get devices connected (wired or wireless), I have to whitelist the MAC addresses on mycampusnet.com. This is annoying (considering I'm well over the 10 device limit including my roommate's stuff), but what's really driving me mad is that I don't seem to have any semblance of a "local" network. I've relied heavily on static IPs and port forwarding in the past (accessing NAS and remote desktop) and (as far as I can understand), that functionality is nonexistent without my router set up. Also, as my wired and wireless devices don't always seem to make it onto the same subnet, I'm unable to use any of my iDevices with my Apple TV (I can, however, mirror to no less than four strangers' Apple TVs at any moment, which is a whole other level of discomforting). I've talked to the head of the apartment complex and she told me that they personally don't have any issue with my using a router, but the provider (CampusConnect) does not currently allow it. Apparently, enough people have put in complaints/requests about the restriction (the apartments are for graduate students and University staff, many of which need to set up things like VPNs for work reasons) to open up some sort of ticket to get the functionality in place, but all the calls I've made to get status updates have been a waste of time. My question is: If I plugged my router into the apartment network, what would happen? I've been told already that personal routers would "interfere with the wireless" and that they would shut my port down if I used one, but is that a legitimate thing or just something made up that sounds real to keep the average Joe from pushing it further? I'm guessing there's some way of configuring my router to keep it from disrupting the rest of the network, but it's not something they want to tell me for obvious reasons. Am I right? And if so, what are the chances that they'd notice the difference in traffic or whatever and shut off my port?

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• IPv6 Routing / Subnetting

  - by nappo

  Recently I have installed Citrix Xen Server 6.2 on a machine. My Provider (Hetzner) gave me the IPv6 Subnet 2a01:4f8:200:xxxx::/64. Followed an article in the providers wiki (1) i got it working and can assign IPs to my guests (CentOS). However i can't assign a second IP to a single guest - it will result in a timeout. I'm not very familiar with IPv6 routing / subnetting - any help or tips for further troubleshooting is welcome! My Setup: XenServer 6.2 IPv6: 2a01:4f8:200:xxxx::2/112 ip -6 route: 2a01:4f8:200:xxxx::/112 dev xenbr0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0 fe80::1 dev xenbr0 metric 1024 mtu 1500 advmss 1440 hoplimit 0 default via fe80::1 dev xenbr0 metric 1024 mtu 1500 advmss 1440 hoplimit 0 Guest 1 IPv6: 2a01:4f8:200:xxxx::3/64 IPv6: 2a01:4f8:200:xxxx::4/64 ip -6 route: 2a01:4f8:200:xxxx::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 default via fe80::1 dev eth0 metric 1 mtu 1500 advmss 1440 hoplimit 4294967295 Guest 2 IPv6: 2a01:4f8:200:xxxx::5/64 Guest 1 IPv6 is working fine, Guest 2 too. As suggested by the wiki article (1) i split my /64 network into a /112. Is it right to set the host /112 and the guests /64? Why is that?

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• Query size of block device file in Python

  - by ??O?????

  Hello. I have a Python script that reads a file (typically from optical media) marking the unreadable sectors, to allow a re-attempt to read said unreadable sectors on a different optical reader. I discovered that my script does not work with block devices (e.g. /dev/sr0), in order to create a copy of the contained ISO9660/UDF filesystem, because os.stat().st_size is zero. The algorithm currently needs to know the filesize in advance; I can change that, but the issue (of knowing the block device size) remains, and it's not answered here, so I open this question. I am aware of the following two related SO questions: Determine the size of a block device (/proc/partitions, ioctl through ctypes) how to check file size in python? (about non-special files) Therefore, I'm asking: in Python, how can I get the file size of a block device file?

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• Registry remotley hacked win 7 need help tracking the perp

  - by user577229

  I was writing some .VBS code at thhe office that would allow certain file extensions to be downloaded without a warning dialog on a w7x32 system. The system I was writing this on is in a lab on a segmented subnet. All web access is via a proxy server. The only means of accessing my machine is via the internet or from within the labs MSFT AD domain. While writing and testing my code I found a message of sorts. Upon refresing the registry to verify my code changed a dword, instead the message HELLO was written and visible in regedit where the dword value wass called for. I took a screen shot and proceeded to edit my code. This same weird behavior occurred last time I was writing registry code except on another internal server. I understand that remote registry access exists for windows systems. I will block this immediately once I return to the office. What I want to know is, can I trace who made this connection? How would I do this? I suspect the cause of this is the cause of other "odd" behaviors I'm experiencing at work such as losing control of my input director master control for over an hour and unchanged code that all of a sudden fails for no logical region. These failures occur at funny times, whenver I'm about to give a demonstration of my test code. I know this sounds crazy however knowledge of the registry component makes this believable. Once the registry can be accessed, the entire system is compromised. Any help or sanity checking is appreciated.

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• Is -1 a magic number? An anti-pattern? A code smell? Quotes and guidelines from authorities

  - by polygenelubricants

  I've seen -1 used in various APIs, most commonly when searching into a "collection" with zero-based indices, usually to indicate the "not found" index. This "works" because -1 is never a legal index to begin with. It seems that any negative number should work, but I think -1 is almost always used, as some sort of (unwritten?) convention. I would like to limit the scope to Java at least for now. My questions are: What are the official words from Sun regarding using -1 as a "special" return value like this? What quotes are there regarding this issue, from e.g. James Gosling, Josh Bloch, or even other authoritative figures outside of Java? What were some of the notable discussions regarding this issue in the past?

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• How to "defragment" MongoDB index effectively in production?

  - by dfrankow

  I've been looking at MongoDB. Feels good. I added some indexes to a collection, uploaded a bunch of data, then removed all the data, and I noticed the indexes did not change size, similar to the behavior reported here. If I call db.repairDatabase() the indexes are then squashed to near-zero. Similarly if I don't remove all the data, but call repairDatabase(), the indexes are squashed somewhat (perhaps because unused extends are truncated?). I am getting index size from "totalIndexSize" of db.collection.stats(). However, that takes a long time (I've read it could be hours on a large database). It's unclear to me how available the database is for reads or writes while it is running. I am guessing not so available. Since I want to run as few instances of mongod as possible, I want to understand more about how indexes are managed after deletes. Can anyone point me to anything or give any advice?

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• BIND master/slave does not respond for queries for its slave

  - by Savas

  Systems are all Centos 6.2 Lets say I have a masterdns with IP 10.2.1.2, authoritative for the 10.2.1.X subnet and let say it is domain example.com I have another two subnets, 10.2.2.X and 10.1.2.X Each one has its own DNS server, dns2 and dns1 respectively and let say these are domains dom2.example.com and dom2.example.com respectively. The masterdns server has slave zones for dns1, dns2 and respond to requests OK. The dns1, dns2 have the masterdns zones as slaves two, and respond to requests OK. So, the masterdns has as slave zones all the subordinate domains of example.com Each of dns1 and dns2 use masterdns as a forwards (which uses another dns cache/proxy server) for dns resolution of internet public domain names. It works OK that too. The problem is, and I cannot figure it out. Why queries for example at dns1 for hostnames of dom2.example.com do not resolve? If i use nslookup - masterdns at dns1 server, resolve (i use directly the dns facility of masterdns). If I use nslookup locally, meaning queries are sent to dns1, for hosts that are at dom2.example.com, they do not resolve. Everything other works OK.

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• Why might RvdProxy.getServices() incorrectly return an empty Array?

  - by butterchicken

  The following code snippet attempts to create a Tib DaemonManager connecting to a particular rvd, and then query for that rvd's services. public static void main(String[] args) throws RuntimeException { DaemonManager daemonManager = new DaemonManager("http://foo.com:7580"); if(daemonManager.getDaemonType() == DaemonManager.RVD) { DaemonProxy daemonProxy = daemonManager.getDaemonProxy(); final RvdProxy rvdProxy = (RvdProxy) daemonProxy; Service[] services = rvdProxy.getServices(); System.out.println(services.length); //prints 0 for (Service service : services) { System.out.println(service.getNetwork()); } } } This prints zero, even though the web interface for this rvd lists multiple available services. Why might this happen? The daemon I am connecting to is running v 7.5.1 of the software, and the rvconfig.jar that I am using is from v 7.5.1 as well. Is there a gotcha when using Tibco's DaemonManager that is causing me to come unstuck?

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• Make UILabel show "No results" instead of "nan"

  - by Mike Rychev

  I have a small app, where user can make some calculations and solve equations. For example, if in a square equation discriminant is less than zero, the x1 and x2 values are "nan", so when I assign x1 and x2 values to UILabels they show "nan" as well. Writing a lot of if's like if(D<0) [label setText:[NSString stringWithFormat: @"No solutions"]]; Doesn't help-there are too many cases. I want to check if after [label setText:[NSString stringWithFormat: @"%f", x]]; label's value is "nan", the label's value will be set to @"No solutions". Doing simple if(label==@"nan") { //code } doesn't help. Thanks in advance!

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• Function arguments VBA

  - by user1068249

  I have these three functions: When I run the first 2 functions, There's no problem, but when I run the last function (LMTD), It says 'Division by zero' yet when I debug some of the arguments have values, some don't. I know what I have to do, but I want to know why I have to do it, because it makes no sense to me. Tinn-function doesn't have Tut's arguments, so I have to add them to Tinn-function's arguments. Same goes for Tut, that doesn't know all of Tinn's arguments, and LMTD has to have both of Tinn and Tut's arguments. If I do that, it all runs smoothly. Why do I have to do this? Public Function Tinn(Tw, Qw, Qp, Q, deltaT) Tinn = (((Tw * Qw) + (Tut(Q, fd, mix) * Q)) / Qp) + deltaT End Function Public Function Tut(Q, fd, mix) Tut = Tinn(Tw, Qw, Qp, Q, deltaT) - (avgittEffektAiUiLMTD() / ((Q * fd * mix) / 3600)) End Function Public Function LMTD(Tsjo) LMTD = ((Tinn(Tw, Qw, Qp, Q, deltaT) - Tsjo) - (Tut(Q, fd, mix) - Tsjo)) / (WorksheetFunction.Ln ((Tinn(Tw, Qw, Qp, Q, deltaT) - Tsjo) / (Tut(Q, fd, mix) - Tsjo))) End Function

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• Need to have access to my office PC from my laptop hopping through two VPN servers

  - by Andriy Yurchuk

  Here's the illustration of what I have ( http://clip2net.com/s/2fvar ): My office PC with it's IP of 123.45.e.f. Office VPN, which I will connect to from my VPS to get to my office PC. My own VPS, which I use as a: client to connect to office VPN (through vpnc, which creates a tun0 with 123.45.c.d IP address); VPN server my laptop can connect to (OpenVPN, tun1, 10.8.0.1) My own laptop I will use as a VPN client to connect to VPS OpenVPN server (will create a tun0 with 10.8.0.2 IP address) Now what I have to do is to allow my laptop to connect to at least my office PC, but preferably to all the 123.45.x.x subnet. Please advice on how to best configure OpenVPN, routing, iptables or whatever else is needed on my VPS so that my laptop could gain access to my office PC. P.S. The reason I'm hopping through my VPS is that being connected to the office WiFi I cannot access my office PC and I cannot connect to office VPN (which is another way to access my office PC). The only way to access my PC from office WiFi I have is hopping though an outside network.

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• Single HTML Table from multiple MySQL tables

  - by David Chouinard

  Hi! I've been struggling for a while with this one; I'll try to explain it here as simply as possible. Consider this MySQL table: +----------+-----------+---------+--------+ |status_id |session_id |pilot_id |present | +----------+-----------+---------+--------+ |1 |61 |901 |1 | |2 |63 |901 |1 | |3 |62 |901 |0 | |4 |62 |902 |1 | |5 |63 |903 |1 | +----------+-----------+---------+--------+ Both session_id and pilot_id are foreign keys making reference to a primary key in another table. The same pilot_id can be associated with different session_id, but every pilot_id-session_id combination is unique. I need to make an HTML table (in PHP) that would display the data like this: +----------+---------+---------+---------+ | |61 |62 |63 | +----------+---------+---------+---------+ |901 |X | |X | |902 | |X | | |903 | | |X | +----------+---------+---------+---------+ Hence, rows are pilot_id and columns are session_id. When a pilot_id-session_id combination has a present value of 1, the corresponding cell should be checked. (ie. when the row-combination is zero or the combination does not exist in the MySQL table, nothing should appear in the HTML table) Phew. Any ideas? Thanks!

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• Using a ControlParameter in FilterParameters when the property is null

  - by end-user

  I have a DataList and FormView; they have separate datasources, though they pull the same info. The FormView's datasource has a FilterExpression to pull whatever's been selected on the DataList. On first load, the SelectedValue of the DataList is null (naturally). I expect the FilterExpression to result in zero rows, but it doesn't. If I set the DefaultValue to 0, it does, but then the parameter never updates when I select something from the DataList. Am I doing it wrong?

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