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  • How can I get a file's size in C?

    - by Nino
    How can I find out the size of a file? I opened with an application written in C. I would like to know the size, because I want to put the content of the loaded file into a string, which I alloc using malloc(). Just writing malloc(10000*sizeof(char)); is IMHO a bad idea.

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  • Makefile and rm -f file.{ext1,ext2,ext3} issue

    - by ak91
    Hello, Could you explain me, why Makefile rule: clean: rm -f foo.{bar1,bar2,bar3} does not result in removing files: foo.bar1 foo.bar2 and foo.bar3? I believe I saw pattern like that many times in various Makefiles, but I'm currently writing my own Makefile and can't make that rule work correctly (no files are removed). I'm using: gnu make 3.81 gnu bash 4.1.5 Bash evals that pattern as I suspect: $ echo test.{a,b,c} test.a test.b test.c Thanks!

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  • Logical equality in C

    - by andrew cooke
    [It seems odd this doesn't exist, so apologies in advance if it's a duplicate] I want to test for logical equality in C. In other words, I want to know whether two values would be equal if both were converted in the normal way associated with logical expressions. In C99, I think that (bool)a == (bool)b gives what I want. Is that correct? What is the normal way of writing this in traditional C?

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  • MySQL app with Cassandra in mind

    - by SODA
    I am planning to make a web app which will eventually use Cassandra. But now that I don't have it and don't have server(s) to run it from, I'd like to start by using MySQL. The question is, is it possible to structure data and queries in such a way that it would be fairly easy to later port it to Cassandra? Main idea, I guess, would be writing MySQL queries that would be possible to change to same Cassandra queries. Maybe you have a better suggestion?

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  • How to receive/send files with a java Webservice

    - by Moons
    Hi! So i'm writing a WebService in Java that should receive a file as an input, and then the WebService does some processing on that file, and finally it should send a new file to the client. My question is : How do I send a file to the client? (and how can I tell them to upload one). Thanks for the help

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  • iPhoneOS Core Data migration: moving something from an entity into a file

    - by Tim Sullivan
    I have a scenario where I'm moving the contents of a blob stored in a core data entity into a file. I need a way to export that data during a migration, where I know the entity that's being converted and save the blob to a file, writing the location of that file into the converted entity's appropriate attribute. I can't seem to find a way to do this. The docs regarding the Three Stage Migration seem to indicate what can be done, but I'm not sure where to define things, or what exactly to define.

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  • How realistic/easy is it to host our own web servers?

    - by morpheous
    It is increasingly looking like we will need to host our own servers, because we need modems physically attached to the server machines. I (think) we will need a T1 line to our office for starters. Dont know what else is involved other than the obvious redundancy and failover requirements. My questions are: Do we really have to do it our selves or can we find a service that allows the modems to be remote as well? If we have to host the servers ourselves, what are the steps (technical and operational) required?

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  • Get interface constant name using its value

    - by Ravisha
    This might not have a major usecase in projects ,but i was just trying a POC kind of project where in i get the key code,and using its value i want to print the key name on screen so i want to relive myself off writing switch cases ,so thinking of going by reflection. Is there a way to get the constant integer of interface's name using its value?

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  • LINQ statement as if condition

    - by dotnetdev
    I saw a piece of code which was written like this: if (from n in numbers select n where n = 5) However, I tried writing something like this but came across errors (bare in mind the code sample may not be exactly as above as I am typing from memory). How can I write code like the above? Thanks

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  • mounting ext4 fs with block size of 65536

    - by seaquest
    I am doing some benchmarking on EXT4 performance on Compact Flash media. I have created an ext4 fs with block size of 65536. however I can not mount it on ubuntu-10.10-netbook-i386. (it is already mounting ext4 fs with 4096 bytes of block sizes) According to my readings on ext4 it should allow such big block sized fs. I want to hear your comments. root@ubuntu:~# mkfs.ext4 -b 65536 /dev/sda3 Warning: blocksize 65536 not usable on most systems. mke2fs 1.41.12 (17-May-2010) mkfs.ext4: 65536-byte blocks too big for system (max 4096) Proceed anyway? (y,n) y Warning: 65536-byte blocks too big for system (max 4096), forced to continue Filesystem label= OS type: Linux Block size=65536 (log=6) Fragment size=65536 (log=6) Stride=0 blocks, Stripe width=0 blocks 19968 inodes, 19830 blocks 991 blocks (5.00%) reserved for the super user First data block=0 1 block group 65528 blocks per group, 65528 fragments per group 19968 inodes per group Writing inode tables: done Creating journal (1024 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 37 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. root@ubuntu:~# tune2fs -l /dev/sda3 tune2fs 1.41.12 (17-May-2010) Filesystem volume name: <none> Last mounted on: <not available> Filesystem UUID: 4cf3f507-e7b4-463c-be11-5b408097099b Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 19968 Block count: 19830 Reserved block count: 991 Free blocks: 18720 Free inodes: 19957 First block: 0 Block size: 65536 Fragment size: 65536 Blocks per group: 65528 Fragments per group: 65528 Inodes per group: 19968 Inode blocks per group: 78 Flex block group size: 16 Filesystem created: Sat Feb 5 14:39:55 2011 Last mount time: n/a Last write time: Sat Feb 5 14:40:02 2011 Mount count: 0 Maximum mount count: 37 Last checked: Sat Feb 5 14:39:55 2011 Check interval: 15552000 (6 months) Next check after: Thu Aug 4 14:39:55 2011 Lifetime writes: 70 MB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: afb5b570-9d47-4786-bad2-4aacb3b73516 Journal backup: inode blocks root@ubuntu:~# mount -t ext4 /dev/sda3 /mnt/ mount: wrong fs type, bad option, bad superblock on /dev/sda3, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so

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  • Is there a declarative way to force a set of Buttons to be the same size?

    - by Jekke
    I'm writing a form in XAML that has multiple buttons with content of different sizes (ie "OK" and "Save As...") Ideally, I'd like them all to be the smallest size possible to hold the largest content. In the example above, both buttons would be the width necessary to hold "Save As..." plus the margins and padding. If they were Grid cells, I could use a SizeGroup. Is there a similar declaration for Buttons?

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  • Accessing an owners variable

    - by Dyldo42
    Okay, I have a ViewController that has 12 UIButtons as instance variables, and they are created in interface builder. I want to access another variable in the viewController from the UIButton's init method. Is that possible? By the way, I'm writing in Objective-C in the iPhone SDK. Cheers.

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  • Assembly Programming and Interrupt Handling

    - by nmr
    I'm writing a program in assembly using MIPS architecture for a class, and I'm having trouble figuring out how to grab an input character by a user and store it in a register to process. The program would open a console, output a message, the user can then input a character and then this determines what is supposed to happen next in the program. Like I said, I'm having trouble figuring out how to grab the character so that I can act upon it in the program. thanks

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  • How do i get direct Descendants with html agility pack

    - by acidzombie24
    I have a specific html node and i want to get the 2nd aka last direct descendant. So after writing .Descendants("div") i wrote ls.Last(). I actually got the last div in the 2nd descendant. Not what i am expecting. How do i get only the direct descendants? or how do i get the descendant with a specific classname? because "div.postBody" would be a suitable alternative.

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  • Encrypt column data with LINQ

    - by kape123
    I was wondering if there is easy solution to this or I'm stuck with following: When updating DB: dti.Pass = Crypter.Encrypt(dti.Pass); _db.SubmitChanges(); When selecting from DB: Data.DbTableItem dti = _db.Single(a=a.Id == id); dti.Pass = Crypter.Decrypt(dti.Pass); Meaning - I am not really into writing repetitive code and this seems like logical thing to be supported by LINQ; so I'm wondering if it is.

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  • how to move scroll at the bottom of list Programmatically?

    - by UMMA
    dear friends, i after calling notifydatasetchanged(); i want to move scroll of list to the bottom of list so that user could see last record in the listview.actually i am writing Chat module so for that purpose i need latest record at the bottom of list. can any one guide me how to achieve this? any help would be appriciated.

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  • Remove noise from a recording

    - by essamSALAH
    I used to record important technical meetings and demos using Camtasia Studio, using a Mic to capture the speaker voice. Sometimes we invite attendees by asking them to call us in the meeting, and they would call on a cell phone then we switch it to loudspeaker so we can hear and talk to them and also record the conversation on Camtasia. The problem I am having now is that playing back those recording produces the regular noise that results from the microphone being close to the mobile phone (the kind of noise you hear when your mobile phone rings and it is near a speaker). Any advice on removing this noise?

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  • Clamping a vector to a minimum and maximum?

    - by user146780
    I came accross this: t = Clamp(t/d, 0, 1) but I'm not sure how to perform this operation on a vector. What are the steps to clamp a vector if one was writing their own vector implementation? Thanks clamp clamping a vector to a minimum and a maximum ex: pc = # the point you are coloring now p0 = # start point p1 = # end point v = p1 - p0 d = Length(v) v = Normalize(v) # or Scale(v, 1/d) v0 = pc - p0 t = Dot(v0, v) t = Clamp(t/d, 0, 1) color = (start_color * t) + (end_color * (1 - t))

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  • SQL Query Help - Return row in table which relates to another table row with max(column)

    - by Seth
    I have two tables: Table1 = Schools Columns: id(PK), state(nvchar(100)), schoolname Table2 = Grades Columns: id(PK), id_schools(FK), Year, Reading, Writing... I would like to develop a query to find the schoolname which has the highest grade for Reading. So far I have the following and need help to fill in the blanks: SELECT Schools.schoolname, Grades.Reading FROM Schools, Grades WHERE Schools.id = (* need id_schools for max(Grades.Reading)*)

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  • Sendmail Alias for Nonlocal Email Account

    - by Mark Roddy
    I admin a server which is running a number of web applications for a software dev team (source control, bug tracking, etc). The server has sendmail running solely as a transport to the departmental email server over which I have no control. We have someone who is still in the department but no longer on the dev team so I need to configure the transport agent to redirect all outgoing email (which would be coming from these applications) to the person that has taken their place. I added an entry in /etc/aliases like such: [email protected]: [email protected] But when I run /etc/init.d/sendmail newaliases I get the following error: /etc/mail/aliases: line 32: [email protected]... cannot alias non-local names So clearly I'm doing something I shouldn't. Is there a way to get aliases to work with non-local names or alternatively is their a way to accomplish my goal of redirecting outgoing mail for this user to another one? Technical Specs if the matter: Ubuntu 6.06 sendmail 8.13 (ubuntu provided package)

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  • How do I do high quality scaling of a image?

    - by pbhogan
    I'm writing some code to scale a 32 bit RGBA image in C/C++. I have written a few attempts that have been somewhat successful, but they're slow and most importantly the quality of the sized image is not acceptable. I compared the same image scaled by OpenGL (i.e. my video card) and my routine and it's miles apart in quality. I've Google Code Searched, scoured source trees of anything I thought would shed some light (SDL, Allegro, wxWidgets, CxImage, GD, ImageMagick, etc.) but usually their code is either convoluted and scattered all over the place or riddled with assembler and little or no comments. I've also read multiple articles on Wikipedia and elsewhere, and I'm just not finding a clear explanation of what I need. I understand the basic concepts of interpolation and sampling, but I'm struggling to get the algorithm right. I do NOT want to rely on an external library for one routine and have to convert to their image format and back. Besides, I'd like to know how to do it myself anyway. :) I have seen a similar question asked on stack overflow before, but it wasn't really answered in this way, but I'm hoping there's someone out there who can help nudge me in the right direction. Maybe point me to some articles or pseudo code... anything to help me learn and do. Here's what I'm looking for: 1. No assembler (I'm writing very portable code for multiple processor types). 2. No dependencies on external libraries. 3. I am primarily concerned with scaling DOWN, but will also need to write a scale up routine later. 4. Quality of the result and clarity of the algorithm is most important (I can optimize it later). My routine essentially takes the following form: DrawScaled( uint32 *src, uint32 *dst, src_x, src_y, src_w, src_h, dst_x, dst_y, dst_w, dst_h ); Thanks! UPDATE: To clarify, I need something more advanced than a box resample for downscaling which blurs the image too much. I suspect what I want is some kind of bicubic (or other) filter that is somewhat the reverse to a bicubic upscaling algorithm (i.e. each destination pixel is computed from all contributing source pixels combined with a weighting algorithm that keeps things sharp. EXAMPLE: Here's an example of what I'm getting from the wxWidgets BoxResample algorithm vs. what I want on a 256x256 bitmap scaled to 55x55. And finally: the original 256x256 image

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