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• Core dump equivalence for Java

  - by m3rLinEz

  So far I have learned about generating thread dump and heap dump using jstack and and jmap respectively. However, jstack thread dump contains only texts describing the stack on each thread. And opening heap dump (.hprof file) with Java VisualVM only shows the objects allocated in the heap. What I actually want is to be able see the stack, to switch to particular stack frame, and watch local variables. This kind of post-mortem debugging can be done normally with tools like WinDbg, gdb and a core file (for a native C++ program.) I wonder if such 'core' file (which will allow me to debug in non-live environment) exists in Java?

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• How to do iPad Photos app pinch to expand

  - by Macatomy

  I don't think this has been asked before on this site, but I might be wrong. Does anyone know the basics of how to get that whole effect with the iPad Photos app? Basically, pinching a stack of photos lets you have a "peek" at the photos in that stack, which expands based on the distance between your 2 fingers in the pinch, then fully completing the outwards pinch gesture opens the photos in the stack in a new view. See this video to get what I mean. I know of at least one third party app that uses the same method as the iPad Photo app, so I know it's possible to do. I'm guessing I would do something with UIPinchGestureRecognizer but I'm not sure exactly how to proceed.

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• Can nusoap return array of string ?

  - by Tim

  Hi all, I would like to return an array of string in my web services I've tryed : <?php require_once('nusoap/nusoap.php'); $server = new soap_server(); $server->configureWSDL('NewsService', 'urn:NewsService'); $server->register('GetAllNews', array(), array('return' => 'xsd:string[]'), 'urn:NewsService', 'urn:NewsService#GetAllNews', 'rpc', 'literal', '' ); // Define the method as a PHP function function GetAllNews() { $stack = array("orange", "banana"); array_push($stack, "apple", "raspberry"); return $stack; } but it doesn't work. What is the correct syntax for that ? Thanks in advance for any help

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• iphone - memory leaks in separate thread

  - by Brodie4598

  I create a second thread to call a method that downloads several images using: [NSThread detachNewThreadSelector:@selector(downloadImages) toTarget:self withObject:nil]; It works fine but I get a long list of leaks in the log similar to: 2010-04-18 00:48:12.287 FS Companion[11074:650f] * _NSAutoreleaseNoPool(): Object 0xbec2640 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0xa58af 0xdb452 0x5e973 0x5e770 0x11d029 0x517fa 0x51708 0x85f2 0x3047d 0x30004 0x99481fbd 0x99481e42) 2010-04-18 00:48:12.288 FS Companion[11074:650f] * _NSAutoreleaseNoPool(): Object 0xbe01510 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0xa58af 0xdb452 0x5e7a6 0x11d029 0x517fa 0x51708 0x85f2 0x3047d 0x30004 0x99481fbd 0x99481e42) 2010-04-18 00:48:12.289 FS Companion[11074:650f] * _NSAutoreleaseNoPool(): Object 0xbde6720 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0xa58af 0xdb452 0x5ea73 0x5e7c2 0x11d029 0x517fa 0x51708 0x85f2 0x3047d 0x30004 0x99481fbd 0x99481e42) Can someone help me understand the problem?

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• How to Retrieve Method's Signature in Squeak

  - by Artium

  printThisMethodSig: aSomething stack := thisContext stackOfSize: 2. Transcript show: (stack at: 2); cr. stack at: 2 returns the method context of the current method. It is possible to retrieve the compiled method of the current method using method message. I want to be able to print the whole signature of the method, for example: from:to:. I looked at both MethodContext and CompiledMethod classes but could not find out how to do it. Thank you.

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• What does subl do here?

  - by drozzy

  So... I'm compiling into assembler, with gcc -S -O2 -m32: void h(int y){int x; x=y+1; f(y); f(2); } And it gives me the following: .file "sample.c" .text .p2align 4,,15 .globl h .type h, @function h: pushl %ebp movl %esp, %ebp subl $24, %esp movl 8(%ebp), %eax movl %eax, (%esp) call f movl $2, 8(%ebp) leave jmp f .size h, .-h .ident "GCC: (GNU) 4.4.3 20100127 (Red Hat 4.4.3-4)" .section .note.GNU-stack,"",@progbits Now I know what pushl and movel: they store the current frame pointer onto the stack and then set the value of the frame pointer register to the value of the Stack Pointer. But I have no idea what the subl $24, %esp is. Thanks!

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• Inheritance in Java

  - by Mandar

  Hello, recently I went through the inheritance concept. As we all know, in inheritance, superclass objects are created/initialized prior to subclass objects. So if we create an object of subclass, it will contain all the superclass information. But I got stuck at one point. Do the superclass and the subclass methods are present on separate call-stack? If it is so, is there any specific reason for same? If it is not so, why they don't appear on same call-stack? E.g. // Superclass class A { void play1( ) { // .... } } // Subclass class B extends A { void play2( ) { //..... } } Then does the above 2 methods i.e play1( ) and play2( ) appear on separate call stack? Thanks.

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• C2244 when trying to call the pow function from inline assembly

  - by schrödingers cat

  I would like to call the pow function from inline assembly. The problem is i'm getting error C2244: 'pow' : unable to match function definition to an existing declaration. I'm new to assembly so this may be a trivial question but how do i resolve this? I guess it has something to do with the compiler not beeing able to properly resolve the overload of pow. The following code fragment is causing the error: do_POW: // push first argument to the stack sub esp, size value_type fld qword ptr [ecx] fstp qword ptr [esp] // push second argument to the stack sub esp, size value_type fld qword ptr [ecx - size value_type] fstp qword ptr [esp]and pop fpu stack // call the pow function call pow sub ecx, size value_type fstp qword ptr [ecx] add esp, 2 * size value_type jmp loop_start

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• Switching between multiple stacks in gdb 6.3

  - by flagmore

  Hello! There are two stacks in the program: one is created by OS and the second is created by program itself to run some code with it. When the program crashes in the second stack, I want to switch to the main stack in gdb and see the backtrace. Is it possible? I tried to save the rsp to a variable and change it after the crash, but the resulting backtrace was not right. I think gdb cannot differentiate frames in stack.

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• Getting "on the wire" Size of Messages in WCF

  - by Mystagogue

  While I'm making SOAP or REST invocations to WCF, I'd like to have the channel stack on either end (client and server) record the on-the-wire size of the data received. So I'm guessing I need to add a custom behavior to the channel stack on either side. That is, on the server side I'd record the IP-header advertised size that was received. On the client side I'd record the IP-header advertised size that was returned from the server. But this presupposes that this information is visible to a custom WCF behavior at the channel stack level. Perhaps it is only visible at the level of ASP.NET (at a layer beneath WCF)? In short, does anyone have any further insight on if and how this information is accessible? I must qualify that this "size" data will be collected in a production environment, as part of regular business logic calls. This question is related to my earlier bandwidth question.

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• Telling someone to "let the world judge their development practices" without being condicending?

  - by leeand00

  There's a person in management on my team, that: Doesn't ask questions on Stack Overflow. Doesn't read development blogs. Doesn't use development best practices. This person is about to make some major decisions about the technology stack that will be used throughout the company. (I asked him what the technology stack was they were planning to use was, and it included many things that are not even development tools). How can I tell them to "Let the world's experience" judge their development practices, before they set them in stone; without being condescending or upsetting them?

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• How to stop an Android Service ONLY when there are no other activities in my app running?

  - by johnrock

  Is there a way I can test if there are any other activities in my app still alive? I am looking to stop a service in an onDestroy method, but only want to do this if there are no other activities from my app still alive on the stack. I have the call stop the service in the main activity's onDestroy() method. This works perfect EXCEPT that if a user launches my app, then launches a few activities in my app, then hits the home screen and RELAUNCHES my app, they will subvert my order and the main activity will now be above other activities of my app. From this state, if they hit the back button and 'back out' of my home screen they will trigger the onDestroy() method and kill the service even though there are other activities open on the stack. I want to avoid this by stopping the service ONLY if I am sure there are no other activities of mine open on the stack. Possible?

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• Simple Emacs keybindings

  - by User1

  I have two operations that I do all the time in Emacs: Create a new buffer and paste the clipboard. [C-S-n] Close the current buffer. [C-S-w] Switch to the last viewed buffer [C-TAB] I feel like a keyboard acrobat when doing the first two operations. I think it would be worth trying some custom keybindings and macros. A few questions about this customization: How would I make a macro for #1? Are these good keybindings (i know this is a bit subjective, but they might be used by something popular that I don't use) Has anyone found a Ctrl-Tab macro that will act like Alt-Tab in Linux/Windows? Specifically, I want it have a stack of buffers according to the last viewed timestamp (most recent on top). I want to continue cycling through the stack until I let go of the ctrl key. When the ctrl key is released, I want the current buffer to get an updated position on the stack.

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• iPhone objective-c autoreleasing leaking

  - by okami

  I do this: NSString *fullpath = [[NSBundle mainBundle] pathForResource:@"text_file" ofType:@"txt"]; Why the following message appear? Is my code leaking? 2010-03-31 13:44:18.649 MJIPhone[2175:207] *** _NSAutoreleaseNoPool(): Object 0x3909ba0 of class NSPathStore2 autoreleased with no pool in place - just leaking Stack: (0x1656bf 0xc80d0 0xcf2ad 0xcee0e 0xd3327 0x2482 0x2426) 2010-03-31 13:44:18.653 MJIPhone[2175:207] *** _NSAutoreleaseNoPool(): Object 0x390b0b0 of class NSPathStore2 autoreleased with no pool in place - just leaking Stack: (0x1656bf 0xc80d0 0xc7159 0xd0c6f 0xd3421 0x2482 0x2426) 2010-03-31 13:44:18.672 MJIPhone[2175:207] *** _NSAutoreleaseNoPool(): Object 0x390d140 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0x1656bf 0xc6e62 0xcec1b 0xd4386 0x24ac 0x2426)

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• Print stacktrace from C code with embedded lua

  - by Matt H

  If I understand this correctly, Lua by default will call the debug library "debug.traceback" when an error occurs. However, when embedding Lua into C code like done in the example here: Simple Lua API Example We only have available the error message on the top of the stack. i.e. if (status) { /* If something went wrong, error message is at the top of */ /* the stack */ fprintf(stderr, "Couldn't load file: %s\n", lua_tostring(L, -1)); /* I want to print a stacktrace here. How do I do that? */ exit(1); } How do I print the stack trace from C after the initial error?

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• Java and Different Types of Stacks

  - by Rarge

  Currently the only stack I know anything about is Vector, I normally use this in place of an array but I understand that there is other types of stacks and they all suit different jobs. The project I am currently working on requires me to be inserting objects in a certain position inside a stack, not always the front of the stack and I am under the impression that a Vector may not be the best class for this job. Could somebody please give me a brief description of the other types of stacks available to me with the Java language and their advantages and disadvantages? Are these names homogeneous? E.g. Are they only used in the Java language or are they used as general terms in Computer Science? Thank you

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• Closing several android activities simultaneously

  - by teedyay

  In my application you can navigate through several Activities until the Activity stack is quite deep. We'd like a button on every Activity that will take you straight back to the main menu - i.e. pop all Activities from the stack except the first one. I've put the button in a View that I can easily put on every Activity in the application, but I can't figure out how to close several Activities in one fell swoop. (If possible, it would be good if the View could work out how many Activities to close by itself - i.e. detect how deep on the stack its own Activity is.)

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• Navigation problem with view controllers.

  - by abdulsamad

  Hi All I have some problem with the my view controllers. When i have about 50 or more records in one of my table view which is below in the stack of view controllers and if i tap the back button quickly the navigation bar on the tap changes but the view does't change. For example: if i have the search controller below in the stack and detail controller up in the stack in this case on tapping the back button quickly the navigation bar comes to the search but the view controller remains on detail page. can any one can give me cause or solution of this problem. your help will be highly appreciated.

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• Is this a valid C statement ?

  - by Philando Gullible

  Lets say I write char c[99] = {'Stack Overflow'}; in C or C++ it does compiles fine but does this valid? By valid I meant not invoking any kind of undefined or unspecified behavior. Again if I write char c[99] = 'Stack Overflow'; gcc complains about multicharacter constant which is obvious but in the above when I am enclosing within curly brackets compiler is happy! why is it so ? I also notice that puts(c); after the first statement will output 'w' precisely the last character of a general string in-place of Stack Overflow. why so ? Could somebody explain this behavior may be separately.

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• Silent Partner

  - by [email protected]

  The Team Behind the Man Behind the Mask As a continuing sponsor of the blockbuster Iron Man franchise, Oracle has been quietly preparing for the explosive sequel blasting its way into theaters this May. Through a series of advertising campaigns, immersive online experiences, and contests, Oracle plans to highlight its backstage efforts to help Marvel Entertainment hone its newfound superpowers. By driving the performance of critical systems, Oracle technologies are helping Marvel transform itself from mild-mannered comic book publisher to film industry power broker. You can learn more about this dynamic duo, and get free movie memorabilia, by visiting our Iron Man 2 showcase site.

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• Best Practices for MVC Architecture

  - by Mystere Man

  There are a number of questions on StackOverflow regard MVC best practices, but most of those seem to revolve around things like using Dependancy Injection, or creating helper functions, or do's and don'ts of what to do in views and controllers. My question is more about how to architect an MVC application. For example, we are encouraged to use DI with the Repository pattern to decouple data access from the controller, however very little is said on HOW to do that specifically for MVC. Where would we place the Repository classes, for instance? They don't seem to be model related specifically, since the model should likewise be relatively decoupled from the actual data access technologies. A second question involves how to structure the layers or tiers. Most example applications (Nerd dinner, Music Store, etc..) all seem to use a single tier, 2 layer approach (not counting tests) that typically has controllers directly calling L2S or EF code. If I want to create a multi-tier/layer aplication what are some of the best practices there in regards to MVC? This question is one-part standard q-a, but another part best-practices, so it could go either here or programmers.se, I am marking it CW. If you feel it would be better suited to programmers.se then it can be migrated. EDIT: What happened to the Community Wiki option? It seems to be gone.

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• Error when plugging iPod Touch into MacBook

  - by Mr. Man

  Whenever I plug my iPod Touch (2nd gen) into my MacBook running Ubuntu 10.10 I get the following error: DBus error org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus) It will show up in the file browser but whenever I try to mount it I get that error. EDIT: I thought that this might be because I had it plugged into a dock, but I tried plugging it in directly to the MacBook with the USB Cable and it still does not work, same error message.

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• 301 redirect, keyword being in bold

  - by seo-man

  Regarding 301; If I redirect nonwww to www domain with 301 redirect, do I still have to determinate inside google webmaster tools which version (www or nonwww) is prefered? Or is setting up redirect enough so therefore I don't need to determinate that inside GWT? Regarding keyword being in bold: Usually keywords are supposted to be in bold font and it is irrelevant if they are links or not. But in heading (h1, h2); does there keyword also need to be in bold or is it enough if I care to put it to the beginning of heading? So elsehow asked; Does the keyword in heading need to be in bold font also?

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• "Marching cubes" voxel terrain - triplanar texturing with depth?

  - by Dan the Man

  I am currently working on a voxel terrain that uses the marching cubes algorithm for polygonizing the scalar field of voxels. I am using a triplanar texturing shader for texturing. say I have a grass texture set to the Y axis and a dirt texture for both the X and Z axes. Now, when my player digs downwards, it still appears as grass. How would I make it to appear as dirt? I have been thinking about this for a while, and the only thing I can think of to make this effect, would be to mark vertices that have been dug with a certain vertex color. When it has that vertex color, the shader would apply that dirt texture to the vertices marked. Is there a better method?

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• Can't remove the libpcap0.8 package

  - by Yogesh

  I am getting error when running apt-get remove root@System:~/Downloads# sudo apt-get remove The following packages have unmet dependencies: libpcap0.8 : Breaks: libpcap0.8:i386 (!= 1.4.0-2) but 1.5.3-2 is installed libpcap0.8:i386 : Breaks: libpcap0.8 (!= 1.5.3-2) but 1.4.0-2 is installed libpcap0.8-dev : Depends: libpcap0.8 (= 1.5.3-2) but 1.4.0-2 is installed E: Unmet dependencies. Try using -f. and when I ran apt-get remove -f this is what happens: root@System:~/Downloads# sudo apt-get remove -f The following extra packages will be installed: libpcap0.8 The following packages will be upgraded: libpcap0.8 1 upgraded, 0 newly installed, 0 to remove and 365 not upgraded. 2 not fully installed or removed. Need to get 0 B/110 kB of archives. After this operation, 13.3 kB of additional disk space will be used. Do you want to continue? [Y/n] y (Reading database ... 163539 files and directories currently installed.) Preparing to unpack .../libpcap0.8_1.5.3-2_amd64.deb ... Unpacking libpcap0.8:amd64 (1.5.3-2) over (1.4.0-2) ... dpkg: error processing archive /var/cache/apt/archives/libpcap0.8_1.5.3-2_amd64.deb (--unpack): trying to overwrite shared '/usr/share/man/man7/pcap-filter.7.gz', which is different from other instances of package libpcap0.8:amd64 dpkg-deb: error: subprocess paste was killed by signal (Broken pipe) Processing triggers for man-db (2.6.7.1-1) ... Errors were encountered while processing: /var/cache/apt/archives/libpcap0.8_1.5.3-2_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) root@System:~/Downloads# clear root@System:~/Downloads# sudo apt-get remove -f Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following extra packages will be installed: libpcap0.8 The following packages will be upgraded: libpcap0.8 1 upgraded, 0 newly installed, 0 to remove and 365 not upgraded. 2 not fully installed or removed. Need to get 0 B/110 kB of archives. After this operation, 13.3 kB of additional disk space will be used. Do you want to continue? [Y/n] y (Reading database ... 163539 files and directories currently installed.) Preparing to unpack .../libpcap0.8_1.5.3-2_amd64.deb ... Unpacking libpcap0.8:amd64 (1.5.3-2) over (1.4.0-2) ... dpkg: error processing archive /var/cache/apt/archives/libpcap0.8_1.5.3-2_amd64.deb (--unpack): trying to overwrite shared '/usr/share/man/man7/pcap-filter.7.gz', which is different from other instances of package libpcap0.8:amd64 dpkg-deb: error: subprocess paste was killed by signal (Broken pipe) Processing triggers for man-db (2.6.7.1-1) ... Errors were encountered while processing: /var/cache/apt/archives/libpcap0.8_1.5.3-2_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) root@System:~/Downloads# root@System:~/Downloads# sudo apt-get check Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these. The following packages have unmet dependencies: libpcap0.8 : Breaks: libpcap0.8:i386 (!= 1.4.0-2) but 1.5.3-2 is installed libpcap0.8:i386 : Breaks: libpcap0.8 (!= 1.5.3-2) but 1.4.0-2 is installed libpcap0.8-dev : Depends: libpcap0.8 (= 1.5.3-2) but 1.4.0-2 is installed E: Unmet dependencies. Try using -f. root@System:~/Downloads# apt-cache policy libpcap0.8:amd64 libpcap0.8 libpcap0.8-dev libpcap0.8: Installed: 1.4.0-2 Candidate: 1.5.3-2 Version table: 1.5.3-2 0 500 http://in.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages *** 1.4.0-2 0 100 /var/lib/dpkg/status libpcap0.8: Installed: 1.4.0-2 Candidate: 1.5.3-2 Version table: 1.5.3-2 0 500 http://in.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages *** 1.4.0-2 0 100 /var/lib/dpkg/status libpcap0.8-dev: Installed: 1.5.3-2 Candidate: 1.5.3-2 Version table: *** 1.5.3-2 0 500 http://in.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages 100 /var/lib/dpkg/status root@System:~/Downloads# root@System:~/Downloads# sudo apt-get -f remove libpcap0.8 libpcap0.8-dev libpcap0.8-dev:i386 libpcap0.8:i386 Reading package lists... Done Building dependency tree Reading state information... Done Package 'libpcap0.8-dev:i386' is not installed, so not removed. Did you mean 'libpcap0.8-dev'? You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: libpcap-dev : Depends: libpcap0.8-dev but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). root@System:~/Downloads# sudo apt-get -f install Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following extra packages will be installed: libpcap0.8 The following packages will be upgraded: libpcap0.8 1 upgraded, 0 newly installed, 0 to remove and 365 not upgraded. 2 not fully installed or removed. Need to get 0 B/110 kB of archives. After this operation, 13.3 kB of additional disk space will be used. Do you want to continue? [Y/n] y (Reading database ... 163539 files and directories currently installed.) Preparing to unpack .../libpcap0.8_1.5.3-2_amd64.deb ... Unpacking libpcap0.8:amd64 (1.5.3-2) over (1.4.0-2) ... dpkg: error processing archive /var/cache/apt/archives/libpcap0.8_1.5.3-2_amd64.deb (--unpack): trying to overwrite shared '/usr/share/man/man7/pcap-filter.7.gz', which is different from other instances of package libpcap0.8:amd64 dpkg-deb: error: subprocess paste was killed by signal (Broken pipe) Processing triggers for man-db (2.6.7.1-1) ... Errors were encountered while processing: /var/cache/apt/archives/libpcap0.8_1.5.3-2_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) root@System:~/Downloads#

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