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  • Which way to go in Linux 3D programming?

    - by Tek
    I'm looking for some answers for a project I'm thinking of. I've searched and from what I understand (correct me if I'm wrong) the only way the program I want to make will work is through 3D application. Let me explain. I plan to make a studio production program but it's unique in the fact that I want to be able to make it fluid. Let me explain. Imagine Microsoft's Surface program where you're able to touch and drag pictures across the screen. Instead of pictures I want them to be sound samples (wavs,mp3,etc). Of course instead the input will be with the mouse but if I ever do finish the project I would totally add touch screen input compatibility! Anyway, I'm guessing there's "physics" to do with it which is why I'm thinking that even though it'll be a 2D application I'll need to code it in a 3D environment. Assuming that I'm correct in how I want to approach my project, where can I start learning about 3D programming? I actually come from PHP programming which will make C++ easier for me to learn. But I don't even know where to start. If I'm not wrong OpenGL is the most up to date API as far as I know. Anyway, please give me your insights guys. I could really use some guidance here since I could totally be wrong in everything that I wrote :)

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  • Linux - Bash Redirect a String to a file

    - by user3502786
    I wrote a simple script that is reading the file content and incrementing a a number inside this file, then i'm holding the change using awk, when i'm trying ro redirect the new String using '' the whole string is redirected in one line and not like the original was which is 4 lines. #!/bin/bash -x # This script is for Incrementing build numbers path=/home/RND/abrodov file=tst.txt tst=`cat $path/$file` printf "this is the content of the file before incrementing: \n $tst" newexpr=`awk '/^Build Number/{$4=$4+1;}1' /home/RND/abrodov/tst.txt` printf "\n the new content \n $newexpr" echo $newexpr > $path/$file This is the original file before running the script: Major Release Number = 4 Minor Release Number = 1 Service Pack Release Number = 2 Build Number = 22 This is the content after i used the script: Major Release Number = 4 Minor Release Number = 1 Service Pack Release Number = 2 Build Number = 23 I'm trying to figure out how can i redirect the text in the original format which is 4 lines.

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  • Retrieving Oracle Cursor with JDBC

    - by BeginnerAmongBeginners
    I have been experiencing some frustrations trying to make a simple Oracle cursor retrieval procedure work with JDBC. I keep on getting an error of "[Oracle][ODBC][Ora]ORA-06553: PLS-306: wrong number or types of arguments in call to 'GETNAME'", but I cannot figure out what I am doing wrong. Here is my code in Java: CallableStatement stmt = connection.prepareCall("call getName(?)"); stmt.registerOutputParameter(1, OracleTypes.CURSOR); stmt.execute(); stmt.close(); con.close(); Here is my procedure in Oracle: CREATE OR REPLACE PROCEDURE getName(cur out SYS_REFCURSOR) IS BEGIN OPEN cur FOR SELECT name FROM customer; END; Thanks in advance. By the way, I am working with Oracle 10.2.0.

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  • Linux / C++: Get Internet IP Address (not local computer's IP)

    - by Levo
    How can I programmatically get the Internet IP address? 1) If the computer is directly connected to the Internet using a USB modem. 2) If the computer is connected to the internet via another computer or a modem/router. I there a way to do both? P.S. This link gives exactly the Internet IP, but how can I use it in my program?

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  • Alternatives to LIMIT and OFFSET for paging in Oracle

    - by depr001
    Hello, I'm developing a web application and need to page ordered results. I normaly use LIMIT/OFFSET for this purpose. Which is the best way to page ordered results in Oracle? I've seen some samples using rownum and subqueries. Is that the way? Could you give me a sample for translating this SQL to Oracle: SELECT fieldA,fieldB FROM table ORDER BY fieldA OFFSET 5 LIMIT 14 (I'm using Oracle 10g, for what it's worth) Thanks!

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  • Program visible to Linux as normal directory

    - by Xam
    I'm trying to write program to work as programmable directory, in other words: User, or other systems open that directory and read/write files or dirs. I try to create program to cache most used files in memory (less I/O to HDD), but right now I don't know how to achive that. There are probably some docs about this but I can't find them. I know that there is FUSE, NFS and others, but reading their source is quite difficult. If any one has info about implementation in C lang I'll be very grateful. Sorry for my English..

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  • script to sum all numbers in a file (linux)

    - by Mark Roberts
    I have a file which contains several thousand numbers, each on it's own line: 34 42 11 6 2 99 ... I'm looking to write a script which will print the sum of all numbers in the file. I've got a solution, but it's not very efficient. (It takes several minutes to run.) I'm looking for a more efficient solution. Any suggestions?

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  • Linux Sendmail Same username multiple domains

    - by Dev Jadeja
    I have configure my sendmail for multiple domains by creating username like [email protected] [email protected] [email protected] in passwd file Now I added entry in file /etc/mail/virtusetable like [email protected] sales\@domain1.com [email protected] sales\@domain2.com [email protected] sales\@domain3.com So when configuring the email client you provide your username as [email protected],[email protected] etc. I tested with webmail and outlook it works. Is this the best way to do it ?.Do i need to put the entry in any there file like genericstable or alias table?

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  • Restricting access to a subdirectory on linux

    - by David
    I'm looking for a way to make a directory accessible only to its parent directories. That is, suppose you have two directories, A and B, at the same level in the file hierarchy. Now suppose that you have a directory A' which is a subdirectory of A. I'd like to enforce that A is able to access the contents of A' but B is not.

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  • Filtering Linux command output

    - by Raajkumar
    Hi, I need to get a row based on column value just like querying a database. I have a command output like this, Name ID Mem VCPUs State Time(s) Domain-0 0 15485 16 r----- 1779042.1 prime95-01 512 1 -b---- 61.9 Here I need to list only those rows where state is "r". Something like this, Domain-0 0 15485 16 r----- 1779042.1 I have tried using "grep" and "awk" but still I am not able to succeed. Please help me on this issue. Regards, Raaj

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  • explain notifier.c from the Linux kernel

    - by apollon
    I'm seeking to fully understand the following code snippet from kernel/notifier.c. I have read and built simple link lists and think I get the construct from K&R's C programming. The second line below which begins with the 'int' appears to be two items together which is unclear. The first is the (*notifier_call) which I believe has independent but related significance with the second containing a 'notifier block' term. Can you explain how it works in detail? I understand that there is a function pointer and multiple subscribers possible. But I lack the way to tie these facts together, and could use a primer or key so I exactly understand how the code works. The third line looks to contain the linking structure, or recursive nature. Forgive my terms, and correct them as fit as I am a new student of computer science terminology. struct notifier_block { int (*notifier_call)(struct notifier_block *, unsigned long, void *); struct notifier_block *next; int priority; };

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  • Programming CLI Commands in Program [C / LINUX]

    - by Blackbinary
    I am attempting to make a program in C which presents a GUI and allows the user to select from a list of applications, which to install on the computer. I can manage the gui, but I've never been taught how to actually issue command line commands. I know with bash its just apt-get install firefox for example, but how do I do such a thing with C? i.e. on click, the program runs 'apt-get install The other problem is I'm not familiar with the proper name for this interaction, so it is hard to search. Thanks for the help

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  • Embedded systems linux

    - by bhaskaragr29
    I want to make final year project so i want a two way interface device one connect to server and other connect to ouput display device..like television. whats are the rquirements i need....and how do i this.

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  • new items on GRUB screen in ubuntu/linux

    - by artsince
    I regularly update my ubuntu (10.04), and new minor versions keep accumulating on the GRUB screen. Right now I have 5 different versions listed on the GRUB, even though I always select the latest version to work with. Am I supposed to do anything to get rid of the old version references? Do these old versions affect disk space/performance?

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  • linux (centos) privilege to copy file

    - by vick
    I need some help with priviligies in centos I have a file in home/admin/public_html/generate.php that I want to do some file copy with using php copy function When I set the file to chown admin:admin generate.php I can access the file but I cannot execute the php copy command because I don't have the proper rights. When I set the file to root:root generate.php I cant access the file beacuse its under admin user folder home/admin/public_html/generate.php how do I solve please, thankful for any help. Bottom line is that I want my generate.php which is owned by admin:admin to be able to copy files from sources outside its home dir and to other home dirs I am using CENTOS

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  • GUI/TUI linux library

    - by Penz
    Is there any UI library that can be to build both a text user interface (ncurses) and graphical user interface (GTK? QT?) from the same source? I know that debconf can be used with various frontends, I would like to build something similar but programmable.

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  • How to move many files in multiple different directories (on Linux)

    - by user1335982
    My problem is that I have too many files in single directory. I cannot "ls" the directory, cos is too large. I need to move all files in better directory structure. I'm using the last 3 digits from ID as folders in reverse way. For example ID 2018972 will gotta go in /2/7/9/img_2018972.jpg. I've created the directories, but now I need help with bash script. I know the IDs, there are in range 1,300,000 - 2,000,000. But I can't handle regular expressions. I wan't to move all files like this: /images/folder/img_2018972.jpg -> /images/2/7/9/img_2018972.jpg I will appreciate any help on this subject. Thanks!

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  • how to find and add a string to a file in linux

    - by user2951644
    How can I check a file for a string if missing the string automatically add it for example Input Input file test.txt this is a test text for testing purpose this is a test for testing purpose this is a test for testing purpose this is a test text for testing purpose I would like to add "text" to all the lines Desired Output this is a test text for testing purpose this is a test text for testing purpose this is a test text for testing purpose this is a test text for testing purpose Is it possible? many thanks in advance Hi guys thanks for all the help, for my case is not that simple. I wont know which line will be different and in the middle string it will not only have a single string. i will give a clearer case Input file test.txt Group: IT_DEPT,VIP Role: Viewer Dept: IT Group: IT_DEPT,VIP Dept: IT Group: FINANCE LOAN VIEWER Role: Viewer Dept: FINANCE Group: FINANCE LOAN VIEWER Dept: FINANCE Desired output file test2.txt Group: IT_DEPT,VIP Role: Viewer Dept: IT Group: IT_DEPT,VIP Role: - Dept: IT Group: FINANCE LOAN VIEWER Role: Viewer Dept: FINANCE Group: FINANCE LOAN VIEWER Role: - Dept: FINANCE So those that are missing "Role:" will be added "Role: - ", hope this clear things out, thanks in advance again

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  • Touchpad access in Linux

    - by Mike Hordecki
    Hi! The problem is: How to access x,y,z coordinates of my touchpad? Now that SHMConfig is disabled by default, I've found out that, in order to do it, I need to access a file from /dev/input/. Those files are, sadly, readable by root only. Is there any way to access the touchpad while in user-mode?

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  • read from file after calling lseek64 - Linux

    - by rursw1
    Hi, I'm trying to read a large file ( 2.0 GB). The seeking is done by lseek64, then I tried to read using read(fileHandle, buffer, bufferLength)\ pread64(fileHandle, buffer, bufferLength, offset) - but both return with -1. What could it be? Thanks in advance!

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  • Run Jar in Background on Linux

    - by Benny
    I have a jar that runs forever (infinite loop with socket listening thread) and need it to run in the background at all times. An example would be: "java -jar test.jar" How do I do this? Thanks in advance!

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  • Porting Windows C++ to Standard (Linux) C++ - WSAGetLastError()

    - by Donal Rafferty
    I am currently porting some Windows mobile C++ code to standard C++. So I am trying to find alternatives for windows specific functions. I have had very little luck in finding a standard C++ function that can help me replace the WSAGetLastError() windows specific function. WSAGetLastError() returns error numbers for errors that occur with sockets in windows. So I was wondering if anyone was aware of a way to replace this function in standard c++? A way to get different error numbers for different outcomes of connecting/dissconection a socket would be sufficent.

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  • bandwidth throttling C linux

    - by bob moch
    hi im currently creating a function to create a sleep time i can pause between packets for my port scanner im creating for personal/educational use for my home network. what im currently doing is opening /proc/net/dev and reading the 9th set of digits for the eth0 interface to find out the current packets being set and then reading it again and doing some math to figure out a delay to sleep between sending a packet to a port to identify it and fingerprint it. my problem is that no matter what throttle % i use it always seems to send the same rate of packets. i think its mainly my way of mathematically creating my sleep delay. edit:: dont mind the function declaration and the struct stuff all im doing is spawning this function in a thread and passing a pointer to a struct to the function, recreating the struct locally and then freeing the passed structs memory. void *bandwidthmonitor_cmd(void *param) { char cmdline[1024], *bytedata[19]; int i = 0, ii = 0; long long prevbytes = 0, currentbytes = 0, elapsedbytes = 0, byteusage = 0, maxthrottle = 0; command_struct bandwidth = *((command_struct *)param); free(param); //printf("speed: %d\n throttle: %d\n\n", UPLOAD_SPEED, bandwidth.throttle); maxthrottle = UPLOAD_SPEED * bandwidth.throttle / 100; //printf("max throttle:%lld\n", maxthrottle); FILE *f = fopen("/proc/net/dev", "r"); if(f != NULL) { while(1) { while(fgets(cmdline, sizeof(cmdline), f) != NULL) { cmdline[strlen(cmdline)] = '\0'; if(strncmp(cmdline, " eth0", 6) == 0) { bytedata[0] = strtok(cmdline, " "); while(bytedata[i] != NULL) { i++; bytedata[i] = strtok(NULL, " "); } bytedata[i + 1] = '\0'; currentbytes = atoi(bytedata[9]); } } i = 0; rewind(f); elapsedbytes = currentbytes - prevbytes; prevbytes = currentbytes; byteusage = 8 * (elapsedbytes / 1024); //printf("usage:%lld\n",byteusage); if(ii & 0x40) { SLEEP += (maxthrottle - byteusage) * -1.1;//-2.5; if(SLEEP < 0){ SLEEP = 0; } //printf("sleep:%d\n", SLEEP); } usleep(25000); ii++; } } return NULL; } SLEEP and UPLOAD_SPEED are global variables and UPLOAD_SPEED is in kb/s and generated via a speedtest function that gets the upload speed of my computer. this function is running inside a POSIX thread updating SLEEP which my threads doing the socket work grab to sleep by after every packet. as testing instead of only doing the ports i want to check i make it do all the ports over and over again so i can run dstat on a machine to check bandwidth and no matter what bandwidth.throttle is set to it always seems to generate the same amount of bandwidth to the dstat machine. the way i calculate how much i "should" throttle by is by finding the maximum throttle speed which is defined as maxthrottle = upload_speed * throttle / 100; for example if my upload speed was 1000kb/s and my throttle was 90 (90%) my max throttle would be 900kb/s from there it would find the current bytes sent from /proc/net/dev and then find my sleep time via incrementing or decrementing it via sleep += (maxthrottle - bytesysed) * -1.1; this should in theory increase or decrease the sleep time based on how many bytes used there are. the if(ii & 0x40) statement is just for some moderation control. it makes it so it only sets sleep to a new time every 30-40 iterations. final notes: the main problem is that the sleep timer does not seem to modify the speed of packets being set. or maybe its just my implementation because on a freshly restarted machine where /proc/net/dev has low numbers of bytes sent it seems to raise the sleep timer accordingly on my 60kb/s upload machine (ex if i set the throttle to 2 it will incline the sleep timer until network bandwidth out reaches the max bandwidth threshold, but when i try running it on a server which as been online forever it doesnt seem to work as nicely if at all. if anyone can suggest a new method of monitoring the network to adjust a sleep delay then let me know or if anyone sees a flaw in my code. thank you.

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