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  • Sharing memory between modules

    - by John Holecek
    Hi, I was wondering how to share some memory between different program modules - lets say, I have a main application (exe), and then some module (dll). They both link to the same static library. This static library will have some manager, that provides various services. What I would like to achieve, is to have this manager shared between all application modules, and to do this transparently during the library initialization. Between processes I could use shared memory, but I want this to be shared in the current process only. Could you think of some cross-platform way to do this? Possibly using boost libraries, if they provide some facilities to do this. Only solution I can think of right now, is to use shared library of the respective OS, that all other modules will link to at runtime, and have the manager saved there.

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  • What does that mean? "mi_cmd_stack_list_frames: Not enough frames in stack."

    - by HelloMoon
    Debugger is telling me this, when I run my app on device: Program received signal: “EXC_BAD_ACCESS”. mi_cmd_stack_list_frames: Not enough frames in stack. mi_cmd_stack_list_frames: Not enough frames in stack. I don't get information about where in code that happens. That's all I get. Any idea what that could mean? The app crashes after that. When the device is not connected to the mac, it still crashes, so not a debugger problem.

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  • No exit option if something is running

    - by max
    How can I catch something going on if the user chooses the exit option from a menu? I mean I'd like to be able to manage the event of a user who is going to close the application but some activity is being performed so he/she shouldn't be able to exit. Here's the code I wrote. In a nutshell : recording is being performed -- user clicks exit -- WARNING "Process is running you can't do it"(The process goes on) nothing is running -- user clicks exit -- application closes Is it possible to solve the problem by just adding a few lines of code without having to rewrite the entire program? thanks very much in advance. MAX exitAction = new AbstractAction("Exit") { public void actionPerformed(ActionEvent e) { System.exit(0); } }; exitAction.putValue(Action.NAME, "Exit"); // description exitAction.putValue(Action.SHORT_DESCRIPTION, "Exit application");

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  • How to read from USB without any driver ?

    - by YouKnowWho
    We are creating small system which has GPS receiver and PC. We want to test my GPS receiver, We do not want to go for a driver on the first go. First I would like to test my circuit works or nor. GPS IC has been set to output NMEA sentence. We want a program which just reads data from USB port and print it on the screen. Can we write something like this easily ? Do we have any open source tool which will achieve this purpose ? Platform : Windows 7

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  • Tutorials for an experienced C# user to learn C++

    - by Tim R.
    Are there any good resources for learning C++ that a C# user could use, which don't require knowledge of C? I have quite a good knowledge of C# via courses in my University's game development program (in a 300 level course right now) but now I need to use C++ for a project. I would use a beginner tutorial but they are so hard for me to follow and learn the basic syntax because they start so slowly. I found a few of tutorials for switching from C++ to C#, but none in the other direction. I do have a little bit of Objective C practice from iPhone programming as well.

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  • Why is const required [C++] ? [closed]

    - by Andy Leman
    Possible Duplicate: What's the difference between a const member function and a non-const member function? class Message { public: Message(const char* pStr, const char* key); Message(const char* pStr); Message(); void encryptMessage(); void decryptMessage(); const char* getUnMessage() const; const char* getEnMessage() const; void getMessage(); void getKey(); ~Message(); private: char* pUnMessage; char* pEnMessage; char* pKey; }; In this program, why using const? (2 different places) Please explain those 2 for me. Thank you very much!

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  • Objective-C++ visibility question

    - by John Smith
    I have linked a library with my program. It works fine. The only problem is that there visibility errors/warnings (thousands of them). They are all of the form: newlib::method() has different visibility (default) in newlib.a and (hidden) in AppDelegate.o It is always with AppDelegate.o. I have tried to set the visibility for both the library and the main app in several ways: the visibility checkmark in XCode, and -fvisibility. Non seem to have worked. Is there somethin special about AppDelegate.mm?

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  • C read part of file into cache

    - by Pete Jodo
    I have to do a program (for Linux) where there's an extremely large index file and I have to search and interpret the data from the file. Now the catch is, I'm only allowed to have x-bytes of the file cached at any time (determined by argument) so I have to remove certain data from the cache if it's not what I'm looking for. If my understanding is correct, fopen (r) doesn't put anything in the cache, only when I call getc or fread(specifying size) does it get cached. So my question is, lets say I use fread and read 100 bytes but after checking it, only 20 of the 100 bytes contains the data I need; how would I remove the useless 80 bytes from cache (or overwrite it) in order to read more from the file.

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  • How to pass parameters with spaces via cstdlib system

    - by buchtak
    Hi, I have this windows console app which takes a file, do some calculations, and then writes the output to a specified file. The input is specified in "app.exe -input fullfilename" format. I need to call this application from my C++ program, but I have a problem with spaces in paths to files. When I call the app directly from cmd.exe by typing (without specifying output file for clarity) "c:\first path\app.exe" -input "c:\second path\input.file" everything works as expected. But, when I try using cstdlib std::system() function, i.e. std::system(" \"c:\\first path\\app.exe\" -input \"c:\\second path\\input.file\" "); the console prints out that c:\first is not any valid command. It's probably common mistake and has simple solution, but I have been unable to find any. Thx for any help.

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  • What could cause a returning function to crash? C++

    - by JeanOTF
    So I have been debugging this error for hours now. I writing a program using Ogre3d relevant only because it doesn't load symbols so it doesn't let me stack trace which made finding the location of the crash even harder. So, write before I call a specific function I print out "Starting" then I call the function and immediately after I print "Stopping". Throughout the function I print out letters A-F where F is printed right before the function returns (one line above the last '}') The weird thing is when the crash occurs it is after the 'F' is printed but there is no 'Stopping'. Does this mean that the crash is happening in between somewhere? The only thing I can think of is something going wrong during the deallocation of some of the memory allocated during the function. I've never had anything happen like this, I will keep checking to make sure it's going wrong where I think it is.

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  • Python Continue Loop

    - by Rob B.
    I am using the following code from this tutorial (http://jeriwieringa.com/blog/2012/11/04/beautiful-soup-tutorial-part-1/). from bs4 import BeautifulSoup soup = BeautifulSoup (open("43rd-congress.html")) final_link = soup.p.a final_link.decompose() trs = soup.find_all('tr') for tr in trs: for link in tr.find_all('a'): fulllink = link.get ('href') print fulllink #print in terminal to verify results tds = tr.find_all("td") try: #we are using "try" because the table is not well formatted. This allows the program to continue after encountering an error. names = str(tds[0].get_text()) # This structure isolate the item by its column in the table and converts it into a string. years = str(tds[1].get_text()) positions = str(tds[2].get_text()) parties = str(tds[3].get_text()) states = str(tds[4].get_text()) congress = tds[5].get_text() except: print "bad tr string" continue #This tells the computer to move on to the next item after it encounters an error print names, years, positions, parties, states, congress However, I get an error saying that 'continue' is not properly in the loop on line 27. I am using notepad++ and windows powershell. How do I make this code work?

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  • From Dictionary To File Python

    - by user3600560
    I am basically trying to write this information from my dictionary to this file. I have this dictionary named files = {} and it is for a filing system I am making. Anyhow it is always being update with new items, and I want those items to be uploaded to the file. Then if you exit the program the files are loaded back to the dictionary files = {}. Here is the code I have so far: file = {} for i in files: g = open(i, 'r') g.read(i) g.close() EDIT I want the contents of the dictionary to be written to a file. The items inside the dictionary are all stored like this: files[filename] = {filedate:filetext} where filename is the file's name, filedate is the date that the file was made on, and the filetext is the files contents.

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  • Makefile automatic link dependency ?

    - by Kuang Chen
    It's easy to let program figure out the dependency at compile time, (with gcc -MM). Nevertheless, link dependency (deciding which libraries should be linked to) seems to be difficult to figure out. This issue become emergent when multiple targets with individual libraries to link to are needed. For instance, three dynamic library targets t1.so, t2.so and t3.so needs to be built. t1.so needs math library (-lm), while t2 and t3 don't. It would be tedious to write separate rules. A single rule requiring the three targets linked with math library saves the trouble. However, it causes inflation of target size since math library is unused for t2.so and t3.so. Any ideas?

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  • Compiler: Translation to assembly

    - by sub
    I've written an interpreter for my experimental language and know I want to move on and write a small compiler for it. It will probably take the source, go through the same steps as the interpreter (tokenizer, parser) and then translate the source to assembly. Now my questions: Can I expect that every command in my language can be 1:1 translated to a bunch of assembly instructions? What I mean is if I will have to completely throw over the whole input program or if it is just translated to assembly per line. Which assembler should I use as output format?

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  • How do game trainers change an address in memory that's dynamic?

    - by GameTrainersWTF
    Lets assume I am a game and I have a global int* that contains my health. A game trainer's job is to modify this value to whatever in order to achieve god mode. I've looked up tutorials on game trainers to understand how they work, and the general idea is to use a memory scanner to try and find the address of a certain value. Then modify this address by injecting a dll or whatever. But I made a simple program with a global int* and its address changes every time I run the app, so I don't get how game trainers can hard code these addresses? Or is my example wrong? What am I missing?

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  • How do you get speech dictated without adding it to a grammar list?

    - by joe
    I'm new to Speech Recognition, and I'm working on a project that will receive a command from a recognizable list. For example, I would say "Play song". The computer would ask the song title, and I can say it. It will then compare my answer to my music library and find it. I know how to add recognizable grammar to the SpeechRecognizer object, how to make the computer speak, and how to play a song in iTunes. I cannot, however, figure out how to get it to dictate or listen and interpret something that isn't in the grammar list. Is there a method I'm missing? Or not yet been simplified by Microsoft? I have no code to show for this, as I am not even sure how to search for this particular idea. Of course, I could have the program read my entire library, but that's not an optimal solution considering I have tens of thousands of songs. Thanks in advance!

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  • breaking the look in jython

    - by kdev
    Hi everyone , I have a written a loop for and if condition and i want to break to loop completely when if gets satisfied. while count: i=0 for line in read_record: #print str.strip(count[1:28]) #print str.strip(read_record[i]) if string.find(str.strip(read_record[i]),str.strip(count[1:28]))>0: code=str.strip(read_record[i+19])+str.strip(read_record[i+20]) print code[25:] break i=i+1 so here if the if string.find condition gets satified i want to go to while loop flow. Please tell me what will be the best place to break and how should i modify the program so that once the if condition is satified iam out of the loop and start again with while loop .

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  • std::out_of_range error?

    - by vette982
    I'm dealing with a file with a linked list of lines with each node looking like this: struct TextLine{ //The actual text string text; //The line number of the document int line_num; //A pointer to the next line TextLine * next; }; and I'm writing a function that adds spaces at the beginning of the lines found in the variable text, by calling functions like linelist_ptr->text.insert(0,1,'\t'); The program compiles, but when I run it I get this error: terminate called after throwing an instance of 'std::out_of_range' what(): basic_string::at Aborted Any ideas?

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  • Transparently storing class state without exposing implementation

    - by RoToRa
    I have a model (MVC) class whose internal state (which basically contains of private int fields) I want to store. The program is running on Android (for now) so I need to store the in a Bundle, but I'll be using the same class later in a desktop application where I'll have to store the state some other way, so I can't reference Bundle directly in my class. So my question is: What is the best way to store (and retrieve) the state of a class without exposing it's implementation? The best I could think of removing the private access modifier so that the fields become package accessible and create read/write helper classes in the same package, but that somehow seems wrong.

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  • C Writting to a file in Unicode

    - by Lefteris
    Hey all, I am having some problems writting to a file in unicode inside my c program. I am trying to write a unicode Japanese string to a file. When I go to check the file though it is empty. If I try a non-unicode string it works just fine. What am I doing wrong? setlocale(LC_CTYPE, ""); FILE* f; f = _wfopen(COMMON_FILE_PATH,L"w"); fwprintf(f,L"???"); fclose(f);

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  • How can I write faster JavaScript?

    - by a paid nerd
    I'm writing an HTML5 canvas visualization. According to the Chrome Developer Tools profiler, 90% of the work is being done in (program), which I assume is the V8 interpreter at work calling functions and switching contexts and whatnot. Other than logic optimizations (e.g., only redrawing parts of the visualization that have changed), what can I do to optimize the CPU usage of my JavaScript? I'm willing to sacrifice some amount of readability and extensibility for performance. Is there a big list I'm missing because my Google skills suck? I have some ideas but I'm not sure if they're worth it: Limit function calls When possible, use arrays instead of objects and properties Use variables for math operation results as much as possible Cache common math operations such as Math.PI / 180 Use sin and cos approximation functions instead of Math.sin() and Math.cos() Reuse objects when passing around data instead of creating new ones Replace Math.abs() with ~~ Study jsperf.com until my eyes bleed Use a preprocessor on my JavaScript to do some of the above operations

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  • HTML 5 <video> tag vs Flash video. What are the pros and cons?

    - by Vilx-
    Seems like the new <video> tag is all the hype these days, especially since Firefox now supports it. News of this are popping up in blogs all over the place, and everyone seems to be excited. But what about? As much as I searched I could not find anything that would make it better than the good old Flash video. In fact, I see only problems with it: It will still be some time before all the browsers start supporting it, and much more time before most people upgrade; Flash is available already and everyone has it; You can couple Flash with whatever fancy UI you want for controlling the playback. I gather that the tag will be controllable as well (via JavaScript probably), but will it be able to go fullscreen? The only two pros for a <video> tag that I can see are: It is more "semantic" - which probably holds no importance to a whole lot of people, including me; It is not dependent on a single commercial 3rd party entity (Adobe) - which I also don't see as a compelling reason to switch, because free players and video converters are already available, and Adobe is not hindering the whole process in any way (it's not in their interests even). So... what's the big deal? Added: OK, so there is one more Pro... maybe. Support for mobile devices. Hard to say though. A number of thoughts race through my head about the subject: How many mobile devices are actually able to decode video at a decent speed anyway, Flash or otherwise? How long until mainstream mobile devices get the <video> support? Even if it is available through updates, how many people actually do that? How many people watch videos on web pages on their mobile phones at all? As for the semantics part - I understand that search engines might be able to detect videos better now, but... what will they do with them anyway? OK, so they know that there is a video in the page. And? They can't index a video! I'd like some more arguments here. Added: Just thought of another Cons. This opens up a whole new area of cross-browser incompatibility. HTML and CSS is quite messy already in this aspect. Flash at least is the same everywhere. But it's enough for at least one major browser vendor to decide against the <video> tag (can anyone say "Internet Explorer"?) and we have a nice new area of hell to explore. Added: A Pro just came in. More competition = more innovation. That's true. Giving Adobe more competition will probably force them to improve Flash in areas it has been lacking so far. Linux seems to be a weak spot for it, cited by many.

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  • complex css image centering help?

    - by Tenshiko
    My problem is a bit more complex than the title says. Sorry, I don't know how to be more specific... I'm working on a website and I came across a part where I should display some thumbnails. The thing is, the thumbnails are not matching in dimensions. (I know, it sounds ridiculous, since this is thumbnails are for, right?) No, there is simply NO WAY to create them in the same dimensions!! I've managed to create a HTML+CSS structure to fix this problem, and the images are not stretching to fit their containers if they are smaller while keeping their aspect ratio. The only issue remaining, is to center the images. Since setting margin to "0 auto" or "auto 0" are not helping, I've tried setting up multiple containers and setting the margins to position the images. This is also not working: if I put a 120x120 picture in a 120x80 inner container, and I set the container's top and left margin to -50%, the margins become -60px both. Can this be fixed? Or is there yet another way to center images? I'm open to any suggestions! HTML: <div id="roll"> <div class="imgfix"> <div class="outer"> <div class="inner"> @if (ImageDimensionHelper.WhereToAlignImg(item.Width, item.Height, 120, 82) == ImgAlign.Width) <!-- ImageDimensionHelper tells me if the image should fit the container with its width or height. I set the class of the img accordingly. --> { <img class="width" src="@Url.Content(item.URL)" alt="@item.Name"/> } else { <img class="height" src="@Url.Content(item.URL)" alt="@item.Name"/> } </div> </div> </div> </div> CSS: .imgfix{ overflow:hidden; } .imgfix .outer { width:100%; height:100%;} .imgfix .inner { width:100%; height:100%; margin-top:-50%; margin-left:-50%; } /*This div (.inner) gets -60px for both margins every time, regardless of the size of itself, or the image inside it*/ #roll .imgfix { width:120px; height:82px; border: 1px #5b91ba solid; } #roll .imgfix .outer { margin-top:41px; margin-left:60px; } /*since I know specificly what these margins should be, I set them explicitly, because 50% got the wrong size.*/ #roll .imgfix img.width { width:120px; height:auto; margin: auto 0; } #roll .imgfix img.height { height:82px; width:auto; margin: 0 auto; }

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  • How to do visible EditText Data on Activity change

    - by user1249134
    HellO friends i am having edit text in my program and if i am writing some thing on there and if i am clciking on other option which will move to anothe activity and when i am coming back to same page the data of my edit text is clearing i dont want to clear data if i move on another page can any body tell me how to do it ..i am doing it by writing below code.. if(PresetQuestion.value=="true") { String note1=note.getText().toString(); note.setText(note1); } but its not woring i thing i am not doing correctly ...

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  • are Hierarchical SIngletons in Java possible?

    - by Zach H
    I've been toying with an interesting idea (No idea if I'll include it in any code, but it's fun to think about) Let's say we have a program that requires a large number of classes, all of a certain subclass. And those classes all need to be singletons. Now, we could write the singleton pattern for each of those classes, but it seems wasteful to write the same code over and over, and we already have a common base class. It would be really nice to create a getSingleton method of A that when called from a subclass, returns a singleton of the B class (cast to class A for simplicity) class A{ public A getSingleton(){ //Wizardry } } class B extends A{ } A blargh = B.getSingleton() A gish = B.getSingleton() if(A == B) System.out.println("It works!") It seems to me that the way to do this would be to recognize and call B's default constructor (assuming we don't need to pass anything in.) I know a little of the black magic of reflection in Java, but i'm not sure if this can be done. Anyone interested in puzzling over this?

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