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  • Is it Bad Practice to use C++ only for the STL containers?

    - by gmatt
    First a little background ... In what follows, I use C,C++ and Java for coding (general) algorithms, not gui's and fancy program's with interfaces, but simple command line algorithms and libraries. I started out learning about programming in Java. I got pretty good with Java and I learned to use the Java containers a lot as they tend to reduce complexity of book keeping while guaranteeing great performance. I intermittently used C++, but I was definitely not as good with it as with Java and it felt cumbersome. I did not know C++ enough to work in it without having to look up every single function and so I quickly reverted back to sticking to Java as much as possible. I then made a sudden transition into cracking and hacking in assembly language, because I felt I was concentrated too much attention on a much too high level language and I needed more experience with how a CPU interacts with memory and whats really going on with the 1's and 0's. I have to admit this was one of the most educational and fun experiences I've had with computers to date. For obviously reasons, I could not use assembly language to code on a daily basis, it was mostly reserved for fun diversions. After learning more about the computer through this experience I then realized that C++ is so much closer to the "level of 1's and 0's" than Java was, but I still felt it to be incredibly obtuse, like a swiss army knife with far too many gizmos to do any one task with elegance. I decided to give plain vanilla C a try, and I quickly fell in love. It was a happy medium between simplicity and enough "micromanagent" to not abstract what is really going on. However, I did miss one thing about Java: the containers. In particular, a simple container (like the stl vector) that expands dynamically in size is incredibly useful, but quite a pain to have to implement in C every time. Hence my code currently looks like almost entirely C with containers from C++ thrown in, the only feature I use from C++. I'd like to know if its consider okay in practice to use just one feature of C++, and ignore the rest in favor of C type code?

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  • recent cvs cygwin newline windows problems. How to solve?

    - by user72150
    Hi all, One of our projects still uses CVS. Recently (sometime in the past year) the Cygwin cvs client (currently using 1.12.13) has given me problems when I update. I suspect the problem stems from windows/unix newline differences. It worked for years without a problem. Here are the symptoms. When I update from the command line, I see messages like these: "no such repository" messages /cvshome : no such repository False-"Modified" due to newline differences M java/com/foo/ekm/value/EkmContainerInstance.java False-"Conflicts" cvs update: Updating java/com/foo/ekm/value/XWiki cvs update: move away `java/com/foo/ekm/value/XWiki/XWikiContainerInstance.java'; it is in the way C java/com/foo/ekm/value/XWiki/XWikiContainerInstance.java Note the for the 'no such repository' error, I found that cd-ing into the 'CVS/' folder and running 'dos2unix Root' updates correctly. I'm not sure how this file (or Repository or Entries) gets whacked. I don't remember when these problems started. I have a workaround: updating from our IDE (Intellij Idea) always succeeds Yes, I know we should switch to (svn|git|mercurial), but does anyone know what causes these problems? when they were introduced? workarounds? thanks, bill

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  • What is a good method to solve cabal install problems?

    - by sp3ctum
    I've used the cabal package manager for Haskell programs to install libraries and new projects that I've cloned from some repositories. More often than not, I keep running into problems. Most projects make installing them seem super easy, but in my case that's not always true - sometimes they are very hard to get running. Some are so hard, in fact, that I've lost interest in the project solely because of not being able to install it. So instead of complaining, I'd like to ask what I should do to better this situation. I'd like to use my most recent problem as an example. I'm interested in trying out the Gitit project. It's a promising looking personal wiki that runs on various version control systems. So here's what I've done: Clone from Github run cabal install in the project directory like I'm told on the project install page: mika@eka:~/git/gitit$ ls BLUETRIP-LICENSE CHANGES HCAR-gitit.tex LICENSE Network README.markdown RELANN-0.6.1 Setup.lhs TANGOICONS YUI-LICENSE data expireGititCache.hs gitit.cabal gitit.hs plugins mika@eka:~/git/gitit$ cabal install Resolving dependencies... cabal: cannot configure happstack-server-7.0.7. It requires base64-bytestring ==1.0.* For the dependency on base64-bytestring ==1.0.* there are these packages: base64-bytestring-1.0.0.0. However none of them are available. base64-bytestring-1.0.0.0 was excluded because gitit-0.10 requires base64-bytestring ==0.1.* mika@eka:~/git/gitit$ So now I'm thinking: well, I'll install happstack-server on its own, maybe that will work: mika@eka:~/git/gitit$ cabal install happstack-server Resolving dependencies... Warning: happstack-server.cabal: Ignoring unknown section type: test-suite Configuring happstack-server-7.0.7... cabal: At least the following dependencies are missing: blaze-html ==0.5.*, hslogger >=1.0.2, monad-control ==0.3.*, network >=2.2.3, sendfile >=0.7.1 && <0.8, system-filepath >=0.3.1, text >=0.10 && <0.12, threads >=0.5, transformers-base ==0.4.* cabal: Error: some packages failed to install: happstack-server-7.0.7 failed during the configure step. The exception was: ExitFailure 1 So looks like there are some dependencies missing. But isn't installing these dependencies the whole point of using cabal in the first place? What should I do? File bug reports (to which project?), install the dependencies manually or something else? Bonus points for explaining what causes these kinds of problems.

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  • Will HDCP cause problems with a MacBook Pro using a VGA projector?

    - by Andrew Grimm
    I'm planning on using a MacBook Pro with a projector that only has a VGA input (through the MBP's Mini DisplayPort and a Mini DisplayPort to VGA converter). Will this have problems with HDCP (High-bandwidth Digital Content Protection), either under Snow Leopard or Windows XP? I'll only be showing other people's photos, user-generated movies or PowerPoint slides. The MacBook Pro was purchased from Apple new in December 2009.

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  • Backing up files on ubuntu for reinstall. Will there be problems with permissions?

    - by adam
    I have some very important files I want to backup before I reinstall my Ubuntu back to 9.04 from the 9.10 (its causing me all sorts of problems). The files total size is small so im just going to copy them over to Dropbox. Im wondering, when i reinstall Ubuntu and copy them back will there be any issues re the permissions of those files because my old user account which created them and the new user Ill setup on the new install will be different?

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  • What is the best practice when coding math class/functions ?

    - by Isaac Clarke
    Introductory note : I voluntarily chose a wide subject. You know that quote about learning a cat to fish, that's it. I don't need an answer to my question, I need an explanation and advice. I know you guys are good at this ;) Hi guys, I'm currently implementing some algorithms into an existing program. Long story short, I created a new class, "Adder". An Adder is a member of another class representing the physical object actually doing the calculus , which calls adder.calc() with its parameters (merely a list of objects to do the maths on). To do these maths, I need some parameters, which do not exist outside of the class (but can be set, see below). They're neither config parameters nor members of other classes. These parameters are D1 and D2, distances, and three arrays of fixed size : alpha, beta, delta. I know some of you are more comfortable reading code than reading text so here you go : class Adder { public: Adder(); virtual Adder::~Adder(); void set( float d1, float d2 ); void set( float d1, float d2, int alpha[N_MAX], int beta[N_MAX], int delta[N_MAX] ); // Snipped prototypes float calc( List& ... ); // ... inline float get_d1() { return d1_ ;}; inline float get_d2() { return d2_ ;}; private: float d1_; float d2_; int alpha_[N_MAX]; // A #define N_MAX is done elsewhere int beta_[N_MAX]; int delta_[N_MAX]; }; Since this object is used as a member of another class, it is declared in a *.h : private: Adder adder_; By doing that, I couldn't initialize the arrays (alpha/beta/delta) directly in the constructor ( int T[3] = { 1, 2, 3 }; ), without having to iterate throughout the three arrays. I thought of putting them in static const, but I don't think that's the proper way of solving such problems. My second guess was to use the constructor to initialize the arrays Adder::Adder() { int alpha[N_MAX] = { 0, -60, -120, 180, 120, 60 }; int beta[N_MAX] = { 0, 0, 0, 0, 0, 0 }; int delta[N_MAX] = { 0, 0, 180, 180, 180, 0 }; set( 2.5, 0, alpha, beta, delta ); } void Adder::set( float d1, float d2 ) { if (d1 > 0) d1_ = d1; if (d2 > 0) d2_ = d2; } void Adder::set( float d1, float d2, int alpha[N_MAX], int beta[N_MAX], int delta[N_MAX] ) { set( d1, d2 ); for (int i = 0; i < N_MAX; ++i) { alpha_[i] = alpha[i]; beta_[i] = beta[i]; delta_[i] = delta[i]; } } My question is : Would it be better to use another function - init() - which would initialize arrays ? Or is there a better way of doing that ? My bonus question is : Did you see some mistakes or bad practice along the way ?

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  • Jython & Mysql - what is the current practice for connection?

    - by Sector7B
    Just trying jython for the first time, because something came up at work that would fit for this perfect for it. I assume jython can make mysql jdbc connection using the mysql jdbc driver. After googling and reading, however I am having problems and it seems jython specific and probably simple. so i do jython: Jython 2.5.1 (Release_2_5_1:6813, Sep 26 2009, 13:47:54) [Java HotSpot(TM) 64-Bit Server VM (Apple Inc.)] on java1.6.0_17 Type "help", "copyright", "credits" or "license" for more information. >>> import sys >>> print sys.path ['', '/JYTHONPATH/mysql-connector-java-5.1.10-bin.jar', '/WorkArea/Apps/jython/jython2.5.1/Lib', '__classpath__', '__pyclasspath__/', '/WorkArea/Apps/jython/jython2.5.1/Lib/site-packages'] >>> code i'm running from java.lang import * from java.sql import * driverName="com.mysql.jdbc.Driver" Class.forName(driverName) url = "jdbc:mysql://localhost/test?user=jgreenaw&password=" con = DriverManager.getConnection(url) stmt = con.createStatement() output riux:Desktop$ jython pymysql.py Traceback (most recent call last): File "pymysql.py", line 7, in <module> Class.forName(driverName) at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:315) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:330) at java.lang.ClassLoader.loadClass(ClassLoader.java:250) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:398) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) java.lang.ClassNotFoundException: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver any advice? thanks

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  • Which functions in the C standard library commonly encourage bad practice?

    - by Ninefingers
    Hello all, This is inspired by this question and the comments on one particular answer in that I learnt that strncpy is not a very safe string handling function in C and that it pads zeros, until it reaches n, something I was unaware of. Specifically, to quote R.. strncpy does not null-terminate, and does null-pad the whole remainder of the destination buffer, which is a huge waste of time. You can work around the former by adding your own null padding, but not the latter. It was never intended for use as a "safe string handling" function, but for working with fixed-size fields in Unix directory tables and database files. snprintf(dest, n, "%s", src) is the only correct "safe strcpy" in standard C, but it's likely to be a lot slower. By the way, truncation in itself can be a major bug and in some cases might lead to privilege elevation or DoS, so throwing "safe" string functions that truncate their output at a problem is not a way to make it "safe" or "secure". Instead, you should ensure that the destination buffer is the right size and simply use strcpy (or better yet, memcpy if you already know the source string length). And from Jonathan Leffler Note that strncat() is even more confusing in its interface than strncpy() - what exactly is that length argument, again? It isn't what you'd expect based on what you supply strncpy() etc - so it is more error prone even than strncpy(). For copying strings around, I'm increasingly of the opinion that there is a strong argument that you only need memmove() because you always know all the sizes ahead of time and make sure there's enough space ahead of time. Use memmove() in preference to any of strcpy(), strcat(), strncpy(), strncat(), memcpy(). So, I'm clearly a little rusty on the C standard library. Therefore, I'd like to pose the question: What C standard library functions are used inappropriately/in ways that may cause/lead to security problems/code defects/inefficiencies? In the interests of objectivity, I have a number of criteria for an answer: Please, if you can, cite design reasons behind the function in question i.e. its intended purpose. Please highlight the misuse to which the code is currently put. Please state why that misuse may lead towards a problem. I know that should be obvious but it prevents soft answers. Please avoid: Debates over naming conventions of functions (except where this unequivocably causes confusion). "I prefer x over y" - preference is ok, we all have them but I'm interested in actual unexpected side effects and how to guard against them. As this is likely to be considered subjective and has no definite answer I'm flagging for community wiki straight away. I am also working as per C99.

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  • VPN IP Routing - slow connections

    - by dannymcc
    UPDATE: Router error logs show: LCP Time-out 0 I'm not sure how to correct this. The Lan-to-Lan profiles are set to -1 Idle Timeout (for the remote branch). I have a PPTP VPN running between two Draytek 2820 routers. They are setup that one dials out to the other one. Main Practice - 192.168.1.0/24 Branch - 192.168.3.0/24 I have then set (on the Branch) router the following route: 192.168.1.0/24 If I then request a server running on 192.168.1.1 from the Branch, it correctly routes through VPN tunnel. If I request the branch server at 192.168.3.1 it correctly routes to the local server without using the VPN tunnel. I have temporarily disabled the firewall on both routers, and made sure that QoS is disabled. The Main Practice internet connection is ~30mb down / ~10mb up, and the Branch connection is ~5mb down / ~2mb up. Anything over the VPN tunnel runs pretty slowly (VNC, Remote Desktop and Terminal Emulators). However, if I dial using the Windows VPN wizard, creating a connection from the laptop to the Main Practice - everything runs quickly. I'm looking for possible causes, and/or ways of further diagnosing the issue. Any help would be greatly appreciated! UPDATE: In summary, when I connect within the Branch and try and access a host that's within the Main Practice it works, but slowly. If I then dial the VPN on my Windows 7 laptop whilst still connected to the Branch network, it's fast. Main Practice Branch Practice Routing Table from Branch Router Key: C - connected, S - static, R - RIP, * - default, ~ - private * 0.0.0.0/ 0.0.0.0 via 126.256.126.103 WAN2 C~ 192.168.1.99/ 255.255.255.255 directly connected VPN-1 S~ 192.168.1.0/ 255.255.255.0 via 192.168.1.99 VPN-1 S~ 192.168.2.0/ 255.255.255.0 via 192.168.1.99 VPN-1 C~ 192.168.3.0/ 255.255.255.0 directly connected LAN2 C 126.256.126.103/ 255.255.255.224 directly connected WAN2 Routing Table from Main Practice Key: C - connected, S - static, R - RIP, * - default, ~ - private * 0.0.0.0/ 0.0.0.0 via 81.139.64.1, WAN2 S 81.137.176.1/ 255.255.255.255 via 81.137.176.1, WAN2 * 81.139.64.1/ 255.255.255.255 via 81.139.64.1, WAN2 C~ 192.168.1.204/ 255.255.255.255 is directly connected, VPN C~ 192.168.1.0/ 255.255.255.0 is directly connected, LAN S~ 192.168.2.0/ 255.255.255.0 via 192.168.1.204, VPN S~ 192.168.3.0/ 255.255.255.0 via 192.168.1.203, VPN Connection Details (from Branch Router) Connection Details (from Main Practice Router) IPERF.exe Output

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  • Problems with SQL Server 2008 - "The client was unable to reuse a session with SPID 62, which had ..

    - by GrZeCh
    Hello, I'm having problems with my SQL Server 2008 installation (10.0.2531.0 - SP1 installed). It works as a database server for small hosting environment (about 500 sites). I'm getting errors like this: The client was unable to reuse a session with SPID 62, which had been reset for connection pooling. The failure ID is 29. This error may have been caused by an earlier operation failing. Check the error logs for failed operations immediately before this error message. in Windows event log and when I run this: SELECT * FROM sys.dm_os_performance_counters WHERE object_name = 'SQLServer:General Statistics' I see that one of counters looks a little odd: Logins/sec 429 Connection Reset/sec 163459 Logouts/sec 399 User Connections 30 Logical Connections 33 any ideas how to check what is causing this problem?

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  • Has anyone else had problems with the miserable kb980408 update?

    - by Dan
    I wasn't experienced any problems before installing kb980408 for Windows 7 x86. The update made it impossible for me to log into my computer after displaying a "Setting up personalized settings for Windows Desktop Update" message, after killing that task a "Windows Explorer is not responding - Windows is checking for a solution to the problem" message appears, then it waits forever... If I killed that task, I was not able to continue the boot process, if I ran explore.exe manually, the same thing happens. The solution, by the way, was to boot into safe mode and use the add/remove program in the control panel to uninstall this wretched piece of code. Start-up repair and/or the use of system restore will not help you, you need to uninstall.

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  • Windows SBS 2008 - how to diagnose port forwarding problems?

    - by Alt_Doru
    We have a Windows SBS 2008 machine. Several ports need to be forwarded from the router to the server (the machine hosts a FTP server, a Web server, and we need to be access it through Remote Desktop). We recently changed routers (from SpeedTouch to Huawei EchoLife HG520s). With the previous router, port forwarding worked fine. Now, after setting up port forwarding on the new router, nothing works anymore. Can anybody help me with directions on how to diagnose/troubleshoot port forwarding problems on the router and in Windows SBS 2008? E.G.: after forwarding a port in the router interface to the internal IP of the server, how can I see in the SBS 2008 logs if the request is properly forwarded to it?

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  • mac osx active directory authentication and linux samba share problems.

    - by Matt Delves
    As a precursor, the network setup is one that includes a combination of Novell Netware servers as well as Windows Servers and Linux servers. I've successfully been able to bind my mac to the Windows Domain and can login without any problems. I've been able to mount shares without needing to resupply login credentials to any windows based share. The problem I've found is that when I'm attempting to mount a share from a linux server, it is asking to resupply the login credentials. Has anyone experienced this kind of problem. The linux servers are a combination of SLES 10 and 11 and RHEL 4 and 5. Thanks, Matt

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  • Windows 2008 IIS 7 PHP Caching / Blank Page Problems?

    - by darkAsPitch
    I don't even know how to explain this. The only thing I can think is 'why am I working with a windows server?' I am renting a dedicated 1and1 server - I installed PHP myself - with fast CGI and caching (pretty sure I checked OK on something about dynamic caching for PHP when I installed it.) Every few hours of intensive php processing - my pages start locking up - usually just showing blank pages - with no errors whatsoever. Just now, I checked a page - let's call it a.php - and it was showing the results of b.php - I thought I had been hacked! Simply restarting the IIS server however, fixes the problem. Any ideas / help / knowledge on similar problems with windows 2008?

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  • Windows 2003, MySQL 5.0.24, Windows Updates causes problems with MySQL?

    - by Alessandro
    Hi, our Windows 2003 webserver has 2 GB of ram and MySQL v. 5.0.24-community-nt. Maybe due to Windows Updates (is it possible??) I've problems with MySQL databases. I should restart everyday IIS services. Events: "Changed limits: max_open_files: 2048 max_connections: 800 table_cache: 619" "Do you already have another mysqld server running on port: 3306 ?" "Can't connect to MySQL server on 'localhost'" 10055 Should I increase the innodb_buffer_pool_size, from 250M to 500M? Or/and? Thanks

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  • Should I anticipate any problems trying to use the same SSL Cert on 2 computers (primary, backup)?

    - by Matt
    We have a production machine running IIS6 with a wildcard SSL certificate. The certificate that was installed is not exportable. We want to upgrade the system to IIS7. As part of this venture, we're creating a backup/failover server that will serve the exact same websites - when we take the primary down for upgrade, the secondary will take over. As such, the secondary also needs the SSL certificate. However, since the certificate was not exportable, this means re-keying it from Go Daddy. Per http://help.godaddy.com/article/867, I know that by re-keying the certificate the original will stop working. I'm still pretty new to SSL certificates, so are there any problems I should anticipate when installing the same SSL certificate on 2 different machines?

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  • Static when metal USB plug touches my case, and other electrical problems.

    - by Archagon
    I have an aluminum PC case. Whenever the metal USB plug from my external drive contacts the front, I get crackling from my speakers, which are connected to an external USB soundcard. (This crackling happens even if they're not connected to the actual output jack.) A few possibly related problems: my audio occasionally starts popping once every few minutes, and my USB devices sometimes play the "connected" sound in Windows even though they're already connected, as if they're briefly disconnecting. My guess is that this has to do with the grounding, but I'm not sure exactly what to do. My case has a round grounding wire, but I don't know where to attach it, and fiddling with it didn't seem to have any effect. Suggestions?

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  • Will I experience problems running a Corsair Force GT SSD in IDE mode?

    - by Ian
    I'm planning to buy the Corsair Force GT 120GB (CSSD-F120GBGT-BK) and I'm planning to use it with an older motherboard that doesn't support AHCI (ASUS P5K SE). Will I experience any problems when running this SSD in IDE mode? A slight performance drop is acceptable. EDIT See my answer below. Conclusion: It works great. Follow the discussion here: http://forum.corsair.com/v3/showthread.php?p=570829#post570829 So far so good. Running Corsair Force GT 120GB (using FW1.3.3) on IDE. No BSOD/Freeze whatsoever. Here are my atto benchmark results:

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  • Can I change a MySQL table back and forth between InnoDB and MyISAM without any problems?

    - by Daniel Magliola
    I have a site with a decently big database, 3Gb in size, a couple of tables with a dozen million records. It's currently 100% on MyISAM, and I have the feeling that the server is going slower than it should because of too much locking, so I'd like to try going to InnoDB and see if that makes things better. However, I need to do that directly in production, because obviously without load this doesn't make any difference. However, I'm a bit worried about this, because InnoDB actually has potential to be slower, so the question is: If I convert all tables to InnoDB and it turns out i'm worse off than before, can I go back to MyISAM without losing anything? Can you think of any problems I might encounter? (For example, I know that InnoDB stores all data in ONE big file that only gets bigger, can this be a problem?) Thank you very much Daniel

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  • Would there be any problems with DEP turned off?

    - by IneedHelp
    I recently moved to a fresh Windows 8 x64 system and I learned that my favourite firewall (JPF - Jetico Personal Firewall) doesn't get along with Win8x64 (CRITICAL_STRUCTURE_CORRUPTION errors), but I can not do without JPF, so I kind of tried everything I could think of (test mode, debugging, various system changes), but I was still getting blue screens because of the firewall driver/software. I know for sure that it is the firewall that is causing the problems because I get blue screens as soon as I install it and they stop when I uninstall it. I Also tested it thoroughly on virtual computers. Anyway, I have discovered that by completely turning DEP off by using this command: bcdedit.exe /set {current} nx AlwaysOff the firewall would not cause blue screens anymore. So my question is, what could go wrong with DEP completely turned off? Note: I do not care much about hardware/windows security, I keep myself secured by using sandboxes and virtual computers (and I also have backups), so I'm not concerned with viruses and root kits or whatever people are freaking out about.

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  • Problems with Finder background images produced in Mac OS X 10.6?

    - by Joe
    Morning all. I'm creating DMG installers with background pictures. My build machine is 10.6. I'm having problems getting them working consistently: If I create one on 10.4 it works fine in 10.5, 10.5 and 10.6, If I create one for 10.5 it works fine in 10.4, 10.5 and 10.6, But if I create one in 10.6, the background picture shows in 10.6 but does not show in 10.4 or 10.5. I think I recall having seen similar reports in one or two places but there's not much information on the web. Has anyone here come across this problem? Is it recognised? Fixable? Unfortunately I have no option of running 10.5 on my build machine... Thanks! Update: This is a confirmed known bug in 10.6 . I will update this if there is any extra news.

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  • What monitor specifications should be taken into consideration to avoid eye problems? [closed]

    - by coding crow
    I spent time programming on my 13.3" laptop for 8 to 10 hours a day. I was planning to buy a good monitor. Now that I have developed CVS buying a monitor has became an immediate priority. I have spend some time trying to understand what I should buy and why. I could only zero down on the size (20") and LED. So, I'm looking for advice on many other factors like resolution, pixel density, panel technology and so forth. What should I look for in a computer monitor to avoid further eye problems? Why?

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