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  • helper functions as static functions or procedural functions?

    - by fayer
    i wonder if one should create a helper function in a class as a static function or just have it declared as a procedural function? i tend to think that a static helper function is the right way to go cause then i can see what kind of helper function it is eg. Database::connect(), File::create(). what is best practice?

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  • Simplest language to make an interpreter for

    - by None
    I want to make an interpreter of a very simple language for practice. When I say simple I don't mean easy to use, I mean simple. Brainf**k is a good example of a language I want. I already have made a brainf**k interpreter in python (which is the language I would be using to write the interpreter). I would appreciate any suggestions of simple languages. Note: I don't want to make a compiler! I want to make an interpreter.

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  • Online backup services

    - by Ilnur
    Could anybody recommend me free online service for everyday backup of my data. It contain files for about 5-10 GB. I'm looking for DropBox. It's very cool service. But I want to edit settings once, and then backup data automatically (my docs folder, music, photos and others). Any ideas?

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  • singleton vs factory?

    - by fayer
    i've got 3 Log classes that all implements iLog interface: DatabaseLog FileLog ScreenLog there can only be one instance of them. initially i though of using single pattern for each class but then i thought why not use a factory for instantiation instead, cause then i wont have to create single pattern for each one of them and for all future Log classes. and maybe someone would want them as multiple objects in the future. so my questions is: should i use factory or singleton pattern here?

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  • Linux Kernel Module - Creating proc file - proc_root undeclared error

    - by Zach
    I copy and paste code from this URL for creating and reading/writing a proc file using a kernel module and get the error that proc_root is undeclared. This same example is on a few sites so I assume it works. Any ideas why I'd get this error? Does my makefile need something different. Below is my makefile as well: Example code for a basic proc file creation (direct copy and paste to get initial test done): http://tldp.org/LDP/lkmpg/2.6/html/lkmpg.html#AEN769 Makefile I'm using: obj-m := counter.o KDIR := /MY/LINUX/SRC PWD := $(shell pwd) default: $(MAKE) ARCH=um -C $(KDIR) SUBDIRS=$(PWD) modules

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  • [OffTopic] PhD is it worth it?

    - by Zenzen
    So I'll be graduating next year (hopefully) and lately I started thinking about getting a PhD in computer science (to be more precise I was thinking about something related to "distributed systems", don't have any specific topics yet in mind), but is it really worth it? A PhD course here lasts 4 years and is free IF you're doing the "normal one" (which means you have class from monday to friday) OR you have to pay if you want to study on the weekends. So I've been thinking about getting a normal full time job (as a JEE programmer) and doing my PhD during the weekends OR doing the normal PhD course (mon-fri) and getting a part time job as a software dev (the main reason I want a job is simple - I need to eat). That would give me practical working experience and theoretical knowledge+a PhD, but it would also mean working 7days a week from 9 to 5 for 4 years straight (sounds like an overkill). Is it, job wise, really worth getting a PhD? As an employer do you prefer people with PhDs or MScs? This might be kinda important - I'm not from the US or western europe, how are PhDs from other countries (I am graduating one of the best, if not the best, school in my country but it's still a central european country...) seen? Are they useless? I won't hide it - after graduation I am thinking about moving abroad.

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  • Resizing and saving an image in WinMobile and .NET CF throws OutOfMemoryException

    - by devguy
    I have a WinMobile app which allows the user the snap a photo with the camera, and then use for for various things. The photo can be snapped at 1600x1200, 800x600 or 640x480, but it must always be resized to 400px for the longest size (the other is proportional of course). Here's the code: private void LoadImage(string path) { Image tmpPhoto = new Bitmap(path); // calculate new bitmap size... double width = ... double height = ... // draw new bitmap Image photo = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format24bppRgb); using (Graphics g = Graphics.FromImage(photo)) { g.FillRectangle(new SolidBrush(Color.White), new Rectangle(0, 0, photo.Width, photo.Height)); int srcX = (int)((double)(tmpPhoto.Width - width) / 2d); int srcY = (int)((double)(tmpPhoto.Height - height) / 2d); g.DrawImage(tmpPhoto, new Rectangle(0, 0, photo.Width, photo.Height), new Rectangle(srcX, srcY, photo.Width, photo.Height), GraphicsUnit.Pixel); } tmpPhoto.Dispose(); // save new image and dispose photo.Save(Path.Combine(config.TempPath, config.TempPhotoFileName), System.Drawing.Imaging.ImageFormat.Jpeg); photo.Dispose(); } Now the problem is that the app breaks in the photo.Save call, with an OutOfMemoryException. And I don't know why, since I dispose the tempPhoto (with the original photo from the camera) as soon as I can, and I also dispose the Graphics obj. Why does this happen? It seems impossible to me that one can't take a photo with the camera and resize/save it without making it crash :( Should I restor t C++ for such a simple thing? Thanks.

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  • Unix shell script with Iseries command

    - by user293058
    I am trying to ftp a file from unix to as400 and executing iseries command in the script. ftp is working fine,I am getting an error in jobd command as HOST=KCBNSXDD.svr.us.bank.net USER=test PASS=1234 #This is the password for the FTP user. ftp -env $HOST << EOF # Call 2. Here the login credentials are supplied by calling the variables. user $USER $PASS # Call 3. Here you will change to the directory where you want to put or get cd "\$QARCVBEN" # Call4. Here you will tell FTP to put or get the file. #Ebcdic #Mode b quote site crtccsid *user quote site crtccsid *sysval put prod.txt quote rcmd sbmjob cmd(call pgm(pmtiprcc0) parm('prod' 'DEV')) job(\$pmtiprcc) jobd(orderbatch) 550-Error occurred on command SBMJOB cmd(call pgm(pmtiprcc0)) job($pmtiprcc) jobd(orderbatch). 550 Errors occurred on SBMJOB command.. 221 QUIT subcommand received.

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  • Illustration of buffer overflows for students (linux, C)

    - by osgx
    Hello My friend is teacher of first-year CS students. We want to show them buffer overflow exploitation. But modern distribs are protected from simples buffer overflows: HOME=`perl -e "print 'A'x269"` one_widely_used_utility_is_here --help on debian (blame it) Caught signal 11, on modern commercial redhat *** buffer overflow detected ***: /usr/bin/one_widely_used_utility_is_here terminated ======= Backtrace: ========= /lib/libc.so.6(__chk_fail+0x41)[0xc321c1] /lib/libc.so.6(__strcpy_chk+0x43)[0xc315e3] /usr/bin/one_widely_used_utility_is_here[0x805xxxc] /usr/bin/one_widely_used_utility_is_here[0x804xxxc] /lib/libc.so.6(__libc_start_main+0xdc)[0xb61e9c] /usr/bin/one_widely_used_utility_is_here[0x804xxx1] ======= Memory map: ======== 00336000-00341000 r-xp 00000000 08:02 2751047 /lib/libgcc_s-4.1.2-20080825.so.1 00341000-00342000 rwxp 0000a000 08:02 2751047 /lib/libgcc_s-4.1.2-20080825.so.1 008f3000-008f4000 r-xp 008f3000 00:00 0 [vdso] The same detector fails for more synthetic examples from the internet. How can we demonstrate buffer overflow with modern non-GPL distribs (there is no debian in classes) How can we DISABLE canary word checking in stack ? DISABLE checking variants of strcpy/strcat ? write an example (in plain C) with working buffer overrun ?

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  • Real world Prolog usage

    - by Hank
    Many study Prolog in college, but I have personally not come in contact with it professionally. The traditional examples given are AI and expert system applications, but what have you used it for and what made Prolog a suitable language for the task?

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  • Query on Booleans in Lambda Calculus

    - by darkie15
    Hi All, I have following query on lambda calculus which am not able to understand: Here is the lambda calculus representation for the AND operator: lambda(m).lambda(n).lambda (a).lambda (b). m(n a b) b Can anyone help me in understanding this representation? Regards, darkie

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  • a non recursive approach to the problem of generating combinations at fault

    - by mark
    Hi, I wanted a non recursive approach to the problem of generating combination of certain set of characters or numbers. So, given a subset k of numbers n, generate all the possible combination n!/k!(n-k)! The recursive method would give a combination, given the previous one combination. A non recursive method would generate a combination of a given value of loop index i. I approached the problem with this code: Tested with n = 4 and k = 3, and it works, but if I change k to a number 3 it does not work. Is it due to the fact that (n-k)! in case of n = 4 and k = 3 is 1. and if k 3 it will be more than 1? Thanks. int facto(int x); int len,fact,rem=0,pos=0; int str[7]; int avail[7]; str[0] = 1; str[1] = 2; str[2] = 3; str[3] = 4; str[4] = 5; str[5] = 6; str[6] = 7; int tot=facto(n) / facto(n-k) / facto(k); for (int i=0;i<tot;i++) { avail[0]=1; avail[1]=2; avail[2]=3; avail[3]=4; avail[4]=5; avail[5]=6; avail[6]=7; rem = facto(i+1)-1; cout<<rem+1<<". "; for(int j=len;j>0;j--) { int div = facto(j); pos = rem / div; rem = rem % div; cout<<avail[pos]<<" "; avail[pos]=avail[j]; } cout<<endl; } int facto(int x) { int fact=1; while(x0) fact*=x--; return fact; }

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  • Stopping background services during an android activity

    - by fanar
    I am developing an android game right now, and it requires very precise timing and synchronization. That said, it is essential that there is no lag during the game. However I sometimes get lag spikes in the game, and I know its not the GC because I have run the ddms tool, and eliminated all the GC calls. However, I do see alot of background services popping up in my ddms logcat. Is there anyway to pause all services when my game is running? I would appreciate any other solutions. Thanks

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  • Regarding to get refrence of IDot11AdHocManager Interface of COM WiFi AdHoc manager Interface

    - by sathaliyawala
    I am Trying to create AdHoc connection and for this i am using AdHoc wifi Interface provided by Microsoft. I have written code :- IDot11AdHocManager *pIAdHocMng = NULL ; HRESULT hr = CoInitialize(NULL); hr = CoCreateInstance(CLSID_Dot11AdHocManager,NULL,CLSCTX_INPROC_HANDLER ,IID_IDot11AdHocManager ,(void**)pIAdHocMng); if(hr == S_OK) printf("CreateNetwork Method success due to following reason :\n %ld",hr) ; else printf("CreateNetwork Method fail due to following reason : %ld \n ",hr) ; getch(); CoUninitialize(); But it will not return reference of Dot11AdHocManager it will return error and NULL value please help me to get the reference of Dot11AdHocManager Interface so i can use it method which help me to create the AdHoc Network

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  • SIMPLE OpenSSL RSA Encryption in C/C++ is causing me headaches

    - by Josh
    Hey guys, I'm having some trouble figuring out how to do this. Basically I just want a client and server to be able to send each other encrypted messages. This is going to be incredibly insecure because I'm trying to figure this all out so I might as well start at the ground floor. So far I've got all the keys working but encryption/decryption is giving me hell. I'll start by saying I am using C++ but most of these functions require C strings so whatever I'm doing may be causing problems. Note that on the client side I receive the following error in regards to decryption. error:04065072:rsa routines:RSA_EAY_PRIVATE_DECRYPT:padding check failed I don't really understand how padding works so I don't know how to fix it. Anywho here are the relevant variables on each side followed by the code. Client: RSA *myKey; // Loaded with private key // The below will hold the decrypted message unsigned char* decrypted = (unsigned char*) malloc(RSA_size(myKey)); /* The below holds the encrypted string received over the network. Originally held in a C-string but C strings never work for me and scare me so I put it in a C++ string */ string encrypted; // The reinterpret_cast line was to get rid of an error message. // Maybe the cause of one of my problems? if(RSA_private_decrypt(sizeof(encrypted.c_str()), reinterpret_cast<const unsigned char*>(encrypted.c_str()), decrypted, myKey, RSA_PKCS1_OAEP_PADDING)==-1) { cout << "Private decryption failed" << endl; ERR_error_string(ERR_peek_last_error(), errBuf); printf("Error: %s\n", errBuf); free(decrypted); exit(1); } Server: RSA *pkey; // Holds the client's public key string key; // Holds a session key I want to encrypt and send //The below will hold the encrypted message unsigned char *encrypted = (unsigned char*)malloc(RSA_size(pkey)); // The reinterpret_cast line was to get rid of an error message. // Maybe the cause of one of my problems? if(RSA_public_encrypt(sizeof(key.c_str()), reinterpret_cast<const unsigned char*>(key.c_str()), encrypted, pkey, RSA_PKCS1_OAEP_PADDING)==-1) { cout << "Public encryption failed" << endl; ERR_error_string(ERR_peek_last_error(), errBuf); printf("Error: %s\n", errBuf); free(encrypted); exit(1); } Let me once again state, in case I didn't before, that I know my code sucks but I'm just trying to establish a framework for understanding this. I'm sorry if this offends you veteran coders. Thanks in advance for any help you guys can provide!

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  • Desktop development vs Web development

    - by Sahat
    After doing some google search I've came to conclusion that desktop development is shifting to the web development. Recent demos of HTML5 show us 3D accelerated games running inside of a browser. Is it true that desktop development is slowly dying? Would it make more sense learning ASP.NET, Silverlight and HTML5 rather than the desktop side of .NET such as WinForms and WPF. Who is leading current job trends: Software development or Web development? Who will lead in the near future?

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  • F# Static Member Type Constraints

    - by Stephen Swensen
    I'm trying to define a function, factorize, which uses structural type constraints (requires static members Zero, One, +, and /) similar to Seq.sum so that it can be used with int, long, bigint, etc. I can't seem to get the syntax right, and can't find a lot of resources on the subject. This is what I have, please help. let inline factorize (n:^NUM) = ^NUM : (static member get_Zero: unit->(^NUM)) ^NUM : (static member get_One: unit->(^NUM)) let rec factorize (n:^NUM) (j:^NUM) (flist: ^NUM list) = if n = ^NUM.One then flist elif n % j = ^NUM.Zero then factorize (n/j) (^NUM.One + ^NUM.One) (j::flist) else factorize n (j + ^NUM.One) (flist) factorize n (^NUM.One + ^NUM.One) []

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  • converting between struct and byte array

    - by chonch
    his question is about converting between a struct and a byte array. Many solutions are based around GCHandle.Alloc() and Marshal.StructureToPtr(). The problem is these calls generate garbage. For example, under Windows CE 6 R3 about 400 bytes of garbarge is made with a small structure. If the code below could be made to work the solution could be considered cleaner. It appears the sizeof() happens too late in the compile to work. public struct Data { public double a; public int b; public double c; } [StructLayout(LayoutKind.Explicit)] public unsafe struct DataWrapper { private static readonly int val = sizeof(Data); [FieldOffset(0)] public fixed byte Arr[val]; // "fixed" is to embed array instead of ref [FieldOffset(0)] public Data; // based on a C++ union }

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  • Setting the primary key of a object type table in Oracle

    - by Rek
    I have two Oracle questions. How can I set the primary key of a table when the table is made up of an object type? e.g. CREATE TABLE object_names OF object_type I have created a Varray type, CREATE TYPE MULTI_TAG AS VARRAY(10) OF VARCHAR(10); but when I try to do SELECT p.tags.count FROM pg_photos p; I get an invalid identifier error on the "count" part. p.tags is a MULTI_TAG, how can I get the number of elements in the MULTI_TAG?

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