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• Best tool to understand source

  - by cache

  I have a source code for a project. I am working on porting it to another device as the current source code is for a linux environment. I am having some error on the newly ported code. So i was thinking it would be best to once again understand the whole source code and this will help me localise the errors. Now the problem is that i tried using 'gdb' for linux to debug the code but it does not help. So is there any tool that I can use to trace the program line by line ? By doing so i can understand the program flow. Please Help !

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• bug fixing appproach

  - by Shirish11

  I have been working on a project comprising of databases. I recently received a bug report for the remote execution of some queries. Usually you try to find out the actual cause for the bug to occur and then fix it. But sometimes what I do when I'm fed up of doing some research (and can't find suitable information on the internet) is just change the logic, which takes me much less time compared to the other option. Is this approach of mine correct or should I try to fix the original bug involving more R&D?

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• Debugger for file I/O development?

  - by datenwolf

  Okay, the question title may be a bit cryptic. But it aptly describes what I'm looking for: I think every experienced coder went through this numerous times: You get a binary file format specification, you implement the reader for it, and… nothing works like expected. So you run your code in the debugger, go execute through the code line by line, every header field is read in seemingly correct, but when it comes to the bulk data, offset and indices no longer match up. What would really help in this situation was a binary file viewer, that shows you the progress of your file pointer, as you step through the code, and ideally would also highlight all memory maps. Then you could see the context of the current I/O operations, most notably those darn "off-by-one" mistakes, which are even more annoying when reading a file. Implementing such a debugger should not be too hard. traces on the process' file descriptors/handles and triggers on the I/O functions, to update the display. Only: I don't know of such a kind of debugger to exist. Do I just lack knowledge about the existance of such a tool, or is there really no such thing?

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• OpenGL Application displays only 1 frame

  - by Avi

  EDIT: I have verified that the problem is not the VBO class or the vertex array class, but rather something else. I have a problem where my vertex buffer class works the first time its called, but displays nothing any other time its called. I don't know why this is, and it's also the same in my vertex array class. I'm calling the functions in this order to set up the buffers: enable client states bind buffers set buffer / array data unbind buffers disable client states Then in the draw function, that's called every frame: enable client states bind buffers set pointers unbind buffers bind index buffer draw elements unbind index buffer disable client states Is there something wrong with the order in which I'm calling the functions, or is it a more specific code error? EDIT: here's some of the code Code for setting pointers: //element is the vertex attribute being drawn (e.g. normals, colors, etc.) static void makeElementPointer(VertexBufferElements::VBOElement element, Shader *shade, void *elementLocation) { //elementLocation is BUFFER_OFFSET(n) if a buffer is bound switch (element) { .... glVertexPointer(3, GL_FLOAT, 0, elementLocation); //changes based on element .... //but I'm only dealing with } //vertices for now } And that's basically all the code that isn't just a straight OpenGL function call.

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• C++ program...overshoots? [migrated]

  - by Zdrok

  I'm decent at C++, but I may have missed some nuance that applies here. Or maybe I completely missed a giant concept, I have no idea. My program was instantly crashing ("blah.exe is not responding") about 1/5 times it was run (other times it ran completely fine) and I tracked the problem down to a constructor for a world class that was called once in the beginning of the main function. Here is the code (in the constructor) that causes the problem: int ii; for(ii=0;ii<=255;ii++) { cout<<"ent "<<ii<<endl; entity_list[ii]=NULL; } for(ii=0;ii<=255;ii++) { cout<<"sec "<<ii<<endl; sector_list[ii]=NULL; } entity_list[0] = new Entity(0,0); entity_list[0]->_world = this; Specifically the second for loop. The cout references are new for the sake of telling where it is having trouble. It would print the entire "ent 1" to "ent 255" and then "sec 1" to "sec 255" and then crash right after, as if it was going for a 257th run through of the second for loop. I set the second for loop to go until "ii<=254" which stopped all crashes. Does C++ code tend to "overshoot" for loops or something? What is causing it to crash at this specific loop seemingly at random? By the way, entity_list and sector_list point to classes called Entity and Sector, respectively, but they are not constructing anything so I didn't think it would be relevant. I also have a forward declaration for the Entity class in a header for this, but since none were being constructed I didn't think it was relevant either. EDIT: It was due to the new Entity line, I assumed wrongly that the fact that altering the for statement to 254 fixed the crashes meant that it had to be there. I still don't understand why the for loop is related, though.

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• HowTo Enable jBullet DebugMode

  - by Kenneth Bray

  I would like to render the physics world of jBullet to debug some issues in my game, and I am not finding too much on enabling the debugDraw method of jBullet. Do I need to write my own debugDraw method, or is there an easier way to draw the physics models to the screen? If there is already a built in method I would prefer to use that, otherwise I guess I will start making my own functions to handle this.

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• Programming Interview : How to debug a program?

  - by Jake

  I was recently asked the following question in an interview : How do you debug a C++ program ? I started by explaining that programs may have syntax and semantic errors. Compiler reports the syntax errors which can be corrected. For semantic errors, various debuggers are available. I specifically talked about gdb, which is command line, and Visual Studio IDE's debugger, which has a GUI, and common commands. I also talked about debug and release version of code, how assertions should be used for debug build, how exceptions helps in automatic cleanup & putting the program in valid state, and how logging can be useful (e.g. using std::clog). I want to know if this answer is complete or not. Also, I want to hear how other people will go about answering this question in a structured manner ? Thanks.

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• Why does Ubuntu's webkit inspector look just like Safari?

  - by NoBugs

  In older Ubuntu, the python-webkit inspector looked like Chrome, as you can see in these screenshots: http://stackoverflow.com/questions/13132459 (It had some annoying bugs, too.) I see Midori's inspector also looks just like Safari, and still has some bugs. In the latest 14.04's python-webkit embedded browser, the inspector actually looks just like Safari - and also seems to still have bugs (icons missing, problems selecting). Is there a reason for this drastic change, or is it just a default configuration? Is there a recommended way to get the webkit-inspector fully working?

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• Ubuntu 12.04 menu bar, nautilus, terminal, and gtk themes not working after installation of Gimp 2.8

  - by Chris

  I installed gimp2.8 from this ppa: ppa:otto-kesselgulasch/gimp after that, my system began having problems. This is my thought process in trying to fix what's happened and the order in which it happened: I noticed the menu bar at the top changed from an opaque black to perfectly clear and the titles of applications and the hidden buttons reacted slowly. No big deal, restarted to see if it fixed it. It didn't, in fact, when the logon screen came up, the password field was grey and boxy like a default windows 98 theme (that's the best I can describe it) as were all the option buttons for gtk programs. I open terminal to try and reinstall gtk, but the terminal is just a black screen with no ability to input commands. I go to a tty and I reinstalled gtk3 and gtk2 (I have both on my system. I don't think they're in conflict, they hadn't been before hand). I restarted. Nothing doing. Log in, nautilus isn't placing icons on my desktop. I click the launcher. It flashes, but no window opens. Try to open by Alt+f2, nothing. I purge ubuntu-desktop, restart, reinstall ubuntu-desktop. Nothing. I have no clue what to do at this point so I'm asking for any help diagnosing the problem and fixing it.

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• Is this fix for Avast Antivirus crashing safe to use?

  - by TmRn

  Well I have installed avast anti virus on Ubuntu 12.04. But after updating, it crashes! So I have made some tweaks like below: Press Ctrl+Alt+T to open the Terminal. When it opens, run the command below. sudo gedit /etc/init.d/rcS Type your password and hit Enter. When the text file opens, add the line: sysctl -w kernel.shmmax=128000000 Make sure the line you added is before: exec /etc/init.d/rc S This is what it should look like: #! /bin/sh # rcS # # Call all S??* scripts in /etc/rcS.d/ in numerical/alphabetical order # sysctl -w kernel.shmmax=128000000 exec /etc/init.d/rc S Save the file. Reboot. My question is: Did I do anything wrong? I mean as I have made some tweaks, will it lower the security of Avast down like viruses do? Please if you are a programmer check this if it contains bug or harmful intentions... Thanks.

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• Can Anything be Done to Make Improv (a 1993 Win 3.1 App) handle larger Files?

  - by user75185

  My very favorite spradsheet is Improv, a 1993 Windows 3.1 application. It still puts Excel to shame for building spreadsheets and writing formulas. The only problem is because Improv was written when 1 Meg of RAM was state of the art, it becomes unstable when working with larger spreadsheets and often crashes and/or corrupts the data file. I am working on a project that greatly exceeds Improv's limits. Although it will ultimately require more robust databasing capability, I could save a lot of critical time if I could delay that headache and continue working in Improv for now. To that end, I moved to the only product I could find that comes close, Quantrix, which is nothing more than Improv updated to handle large spreadsheets and utilize today's technologies. The problems with Quantrix are its speed (significantly slower than Improv) and its $1000 price (which I cannot afford). I have already had 3 15 day extensions after the initial 30 day trial, so my time to use Quantrix as a bridge is at its end. Searches for Improv over the years have gotten me nowhere and, not surprisingly after reading some posts on this site, I got nothing for the money and time invested to find a programmer to write code to "fix" this problem. Improv is freely available as "abandonware" at http://vetusware.com/download/LotusImprov2.1/?id=5797 , and the best background info can be found on Wikipedia and at "Moose's Greatest Software Products of All Time - Lotus Improv" http://moosevalley.fhost.com.au/mooses_review_page_lotus_improv.html It is critically urgent for me to focus on analyzing the data asap. Working in a stable Improv would, without question, be the fastest route. To that end, I am looking for answers to the following questions and anything else that might be helpful: 1) Is it lawful to hire someone to fix Improv for my own use? If so, 2) About how much should it cost? 3) About how long should it take? 4) What skills should I be looking for &/or how should a post be worded? 5) Is there a niche site where it should it be posted? 6) What questions can I ask to quickly screen candidates? Since I am not a programmer, I need questions the answers to which leave no room to confuse me, whether intentional or not. For example, what tools or players should someone with an acceptable competency level have knowledge of?

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• Switching from Debug into Release Mode with VS2010 as IDE and Intel C++ Compiler 13

  - by Drazick

  I have a code of a Plug In from an SDK. The code is in Debug Mode. I use Intel Compiler which only applies optimizations in Release Mode. Under configuration manager of the project only "Debug" mode is defined. How could I switch to "Release" mode and enable all Intel Compiler's optimizations? If I enable them on debug mode nothing is applied (Empty Report). I couldn't find the trick to do so. Thank You.

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• strlen returns incorrect value when called in gdb

  - by alesplin

  So I'm noticing some severely incorrect behavior from calls to standard library functions inside GDB. I have the following program to illustrate: #include <stdio.h> #include <stdlib.h> #include <string.h> int main(int argc, char *argv[]) { char *s1 = "test"; char *s2 = calloc(strlen("test")+1,sizeof(char)); snprintf(s2,strlen("test")+1,"test"); printf("string constant: %lu\n", strlen(s1)); printf("allocated string: %lu\n", strlen(s2)); free(s2); return 0; } When run from the command-line, this program outputs just what you'd expect: string constant: 4 allocated string: 4 However, in GDB, I get the following, incorrect output from calls to strlen(): (gdb) p strlen(s1) $1 = -938856896 (gdb) p strlen(s2) $2 = -938856896 I'm pretty sure this is a problem with glibc shipped with Ubuntu (I'm using 10.10), but this is a serious problem for those of us who spend lots of time in GDB. Is anyone else experiencing this kind of error? What's the best way to fix it? Build glibc from source? (I'm already running a version of GDB built from source)

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• What are you using the debugger for? [closed]

  - by Peter Gfader

  Some scenarios that I can think of: Reading/Understanding code Understanding the flow (what happens when) Stop program and see where it is up to a. Attach debugger b. Exception -- Debug Discover API Run to breakpoint and verify state The question got closed on SO, so I ask here... http://stackoverflow.com/questions/6462461/what-do-you-use-the-debugger-for What are you using the debugger for? Which scenario did you ran into, that you needed the debugger? Could you have done it differently?

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• How to teach your users/customers to send better error descriptions

  - by ckeller

  I often have to deal with customers or users which are reporting errors in applications. Most of the time their content is something useless as ERROR!!! x does not work without much more information. For resolving the issue I have to request every single detail of them, which often is more time consuming than fixing the issue itself. Other send information in formats which are not ideal, like screenshots (of data records, not of errors) although they could send a link (we have access to the systems) and so on. How do you tell your users/customers to describe the problems with more details so that the whole process could be easier for both sides? edit This question is more about the social skills, than how to achieve programmatic collection of logs and error information. I'm aware of the fact that this should be part of good software design.

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• How do I debug a cluster running Microsoft server 2003?

  - by alcor

  I'm sole developer of a complex critical software system, written in Visual C++ 2005. It's deployed on a classical Microsoft cluster scenario (active/passive), that has Windows Server 2003 R2. If a server A goes down, the other one (B) starts and take the ownership of its duties. You have to know that: Both servers have the same Microsoft patches/fixes, same hardware, same everything. Both servers use the same memory storage (a RAID-6 through fiber channel). This software has a main module that launches the peripheral modules. if a peripheral module crashes, the main module restarts it. When I switch the application in one of the two servers (let's say the B server) two of the peripheral modules of the main applications just started to crash apparently without reason about 2 seconds after the start of the peripheral module. What could I do to analyze/inspect/resolve this weird situation?

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• I need advice on how to debug a cluster

  - by alcor

  I'm the only developer of a complex critical software system, written in Visual C++ 2005. It's deployed on a classical Microsoft cluster scenario (active/passive), that has Windows Server 2003 R2. If a server A goes down, the other one (B) starts and take the ownership of its duties. You have to know that: both servers have the same Microsoft patches/fixes, same hardware, same everything. both servers use the same memory storage (a RAID-6 through fiber channel). this software has a main module who launch the peripheral modules. if a peripheral module crashes, the main module restarts it. When I switch the application in one of the two servers (let's say the B server) two of the peripheral modules of the main applications just started to crash apparently without reason about 2 seconds after the start of the peripheral module. What could I do to analyze/inspect/resolve this weird situation?

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• Print all values in a value object

  - by SKDev

  I have to debug an issue which requires me to print all the values of a Value Object that is returned by a web service call. The Value object is a complex object in the sense, it has another object as its member which in turn has another object. Printing all the values by using get methods is cumbersome. So was wondering if there is a way to break down the value object by any way to get to a primitive level like String or int or Date and print them all using one API? I had a look at the below question but my prob is that i don't have access to the source code of the value object. The sources are in obfuscated jar. http://stackoverflow.com/questions/2413001/how-to-print-values-of-an-object-in-java

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• Debugging a local SQL Server 2008 stored proceedure from Visual studio 2008

  - by Ricibob

  Hi all, There are a few posts about this question around but most concern remote debugging - here everything is on same machine. Visual studio 2008. I have a data connection to localhost SQL Server 2008 using Windows authentication with an admin account - this account is a member of sysadmin in SQL server. I double click stored proc and add a break point. I right click and select "Step into stored proceedure". I get the loathed and feared "Canceled by user." in output window. Does anyone know whats doing? Further - right clicking on the data connection shows both "Application debugging" and "Allow SQL/CLR Debugging". I have checked "Enable SQL Server debugging" on the properties of the C# client app. If run that in debug and try to step in to stored proc code "command.ExecuteNonQuery()" then the break points in the stored proc become disabled and are not pulled. After doing this once the right click on stored proc "Execute" and "Step into stored proceedure" are greyed/disabled. To get them back I have to restart visual studio (refresh connection doesn't do it). Any help much appreciated!! Cheers.

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• debugging windows 2008 "user profile service"

  - by Jeroen Wilke

  Hi, I would appreciate some help debugging my windows 2008 profile service. Any domain account that logs on to my 2008 machine gets a +- 20 second waiting time on "user profile service" I am using roaming profiles, they are around 8mb in size, and most folders are already redirected to a network share. event log registers no errors, there is more than 1 network card installed, but I have the correct card listed as "primary" Is there any way to increase verbosity of logging on specifically the "user profile service" ? Regards Jeroen

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• Should I expect ICMP transit traffic to show up when using debug ip packet with a mask on a Cisco IOS router?

  - by David Bullock

  So I am trying to trace an ICMP conversation between 192.168.100.230/32 an EZVPN interface (Virtual-Access 3) and 192.168.100.20 on BVI4. # sh ip access-lists 199 10 permit icmp 192.168.100.0 0.0.0.255 host 192.168.100.20 20 permit icmp host 192.168.100.20 192.168.100.0 0.0.0.255 # sh debug Generic IP: IP packet debugging is on for access list 199 # sh ip route | incl 192.168.100 192.168.100.0/24 is variably subnetted, 2 subnets, 2 masks C 192.168.100.0/24 is directly connected, BVI4 S 192.168.100.230/32 [1/0] via x.x.x.x, Virtual-Access3 # sh log | inc Buff Buffer logging: level debugging, 2145 messages logged, xml disabled, Log Buffer (16384 bytes): OK, so from my EZVPN client with IP address 192.168.100.230, I ping 192.168.100.20. I know the packet reaches the router across the VPN tunnel, because: policy exists on zp vpn-to-in Zone-pair: vpn-to-in Service-policy inspect : acl-based-policy Class-map: desired-traffic (match-all) Match: access-group name my-acl Inspect Number of Half-open Sessions = 1 Half-open Sessions Session 84DB9D60 (192.168.100.230:8)=>(192.168.100.20:0) icmp SIS_OPENING Created 00:00:05, Last heard 00:00:00 ECHO request Bytes sent (initiator:responder) [64:0] Class-map: class-default (match-any) Match: any Drop 176 packets, 12961 bytes But I get no debug log, and the debugging ACL hasn't matched: # sh log | inc IP: # # sh ip access-lists 198 Extended IP access list 198 10 permit icmp 192.168.100.0 0.0.0.255 host 192.168.100.20 20 permit icmp host 192.168.100.20 192.168.100.0 0.0.0.255 Am I going crazy, or should I not expect to see this debug log? Thanks!

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• Visual Studio 2010 Beta start without debugging Console wont stay open

  - by CousinVinny

  I want to keep the console (output) window open to view the output of the project I am working on. I have enabled the start without debugging option and added the button to the debugging toolbar, but alas it fails to keep it open nicely like in visual studio 2008. I have to add cin.getline() etc etc etc to get it to stay open, but I don't want to type it. Any suggestions as to alter it Visual Studio 2010 to keep it open, or any debugging tricks to make it easier to view output for longer than a flash. Visual Studio used to have a "Press any key to continue prompt" I want it back...

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• VB.net Edit-And-Continue: ignore "unable to apply this change while debugging"

  - by FastAl

  When using VB.Net (2008) and paused in debugging, Edit-And-Continue is a great time-saver. However if you change any module/class-level information (variable, sub/function signature, etc), you get the error message like this: "unable to apply this change while debugging" While I can understand the technical challenge to making this work (and why it would be hard), it leaves me in a tight spot with just a few options: 1) Restart and recompile and get the program back to the same state 2) Continue debugging without making the change, and risk forgetting 3) Type up a reminder note to make the change All of which are annoying. Now I know that option '4) Just actually make the change' may not be possible. but does anybody know how to enable the following 'technically easy' possibility? 4) Let me change the code, get it flagged with the purple squiggly underline, so I can save it, but just ignore the change until recompile I have checked the Tools|options|debug|edit and continue, nothing appears to let me do this. thanks!

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• Visual Studio stops debugging with no errors unexpectedly

  - by HeavyWave

  I am debugging a project and Visual Studio stops debugging and closes the program on the following line with no exceptions or error messages (I have enabled notifications for any thrown exceptions in options): var query = Session.Linq<RSS>() .Where(x => x.LastRetrieved <= date || x.LastRetrieved == null) .Where(x => x.Moderated); Where Session.Linq refers to LINQ2NHibernate. Anyway, the question is: what are the possible reasons for such behavior? Tested both on VS 2010 and 2008 - they behave identically just falling out of debugging.

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• What is the historical basis of using Javascript in web programming?

  - by rd108

  I come from a scientific biology background where we also use Python a lot. Now that I've begun to start with Web development, I've consistently found myself wondering just why it is that JavaScript is the primary client-side language on the Web. Is JavaScript's predominance a historical accident or something else? Also, I'm curious if there are any hurdles to integrating Python into client-side scripting?

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