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  • Is `std::string(strerror(errno))` dangerous?

    - by StackedCrooked
    At some places in my code, I print debug messages like this: int ret = getLinkSpeed(device.getSysName(), linkSpeed); if (ret < 0) { logDebug("Failed to obtain port speed for this device. Error: " + std::string(strerror(errno))); } From the documentation it is not entirely clear if strerror will return 0 under certain conditions (which would cause my code to crash). Does anyone know if it's safe?

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  • C++[MSVC2010]: How does switch compile and how optimized and fast is it?

    - by ekul
    As I found out that I can use only numerical values in C++'s switch statements, I thought that there then must be some deeper difference between it and a bunch of if-else's. Therefore I asked myself: (How) does switch differ from if-elseif-elseif in terms of runtime speed, compile time optimization and general compilation? I'm mainly speaking of MSVC here.

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  • Netbeans IDE tutorials

    - by James P.
    I mostly use Eclipse but have mentionned Netbeans on my cv. Are there any good concise and up-to-date tutorials apart from the official ones that could bring me up to speed on how to use the IDE efficiently (shortcuts, debugging, views ...)? This excludes programming tutorials as I don't really need them unless there's a special manipulation involved.

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  • R: optimal way of computing the "product" of two vectors

    - by Musa
    Hi, Let's assume that I have a vector r <- rnorm(4) and a matrix W of dimension 20000*200 for example: W <- matrix(rnorm(20000*200),20000,200) I want to compute a new matrix M of dimension 5000*200 such that m11 <- r%*%W[1:4,1], m21 <- r%*%W[5:8,1], m12 <- r%*%W[1:4,2] etc. (i.e. grouping rows 4-by-4 and computing the product). What's the optimal (speed,memory) way of doing this? Thanks in advance.

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  • I wanna make a UDP comunication between two or more computers using c++ on linux

    - by HMojtaba
    Hi every one! I really need to make this connection throw wireless (or lan ethernet). I have done this on windows (VS2008 C#, sockets), but here on linux (ubuntu 10.04) I have installed mono, and i can handle many things there, but it's speed is unacceptable for my 600MHz processor. so i decided to move on c++, but i'm new to c++ and i'm not familiar to many of it's headers. Is there any header or any library which can do that for me? thanks

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  • Loading images faster in Gridview

    - by rs
    I have a gridview which displays data for all employees and their images. The images take more time to render completely when i click sort or paging or reload. I'm using httphandler to display image as stream. Is there a way i can speed up this image loading?

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  • How can I scale movement physics functions to frames per second (in a game engine)?

    - by Richard
    I am working on a game in Javascript (HTML5 Canvas). I implemented a simple algorithm that allows an object to follow another object with basic physics mixed in (a force vector to drive the object in the right direction, and the velocity stacks momentum, but is slowed by a constant drag force). At the moment, I set it up as a rectangle following the mouse (x, y) coordinates. Here's the code: // rectangle x, y position var x = 400; // starting x position var y = 250; // starting y position var FPS = 60; // frames per second of the screen // physics variables: var velX = 0; // initial velocity at 0 (not moving) var velY = 0; // not moving var drag = 0.92; // drag force reduces velocity by 8% per frame var force = 0.35; // overall force applied to move the rectangle var angle = 0; // angle in which to move // called every frame (at 60 frames per second): function update(){ // calculate distance between mouse and rectangle var dx = mouseX - x; var dy = mouseY - y; // calculate angle between mouse and rectangle var angle = Math.atan(dy/dx); if(dx < 0) angle += Math.PI; else if(dy < 0) angle += 2*Math.PI; // calculate the force (on or off, depending on user input) var curForce; if(keys[32]) // SPACE bar curForce = force; // if pressed, use 0.35 as force else curForce = 0; // otherwise, force is 0 // increment velocty by the force, and scaled by drag for x and y velX += curForce * Math.cos(angle); velX *= drag; velY += curForce * Math.sin(angle); velY *= drag; // update x and y by their velocities x += velX; y += velY; And that works fine at 60 frames per second. Now, the tricky part: my question is, if I change this to a different framerate (say, 30 FPS), how can I modify the force and drag values to keep the movement constant? That is, right now my rectangle (whose position is dictated by the x and y variables) moves at a maximum speed of about 4 pixels per second, and accelerates to its max speed in about 1 second. BUT, if I change the framerate, it moves slower (e.g. 30 FPS accelerates to only 2 pixels per frame). So, how can I create an equation that takes FPS (frames per second) as input, and spits out correct "drag" and "force" values that will behave the same way in real time? I know it's a heavy question, but perhaps somebody with game design experience, or knowledge of programming physics can help. Thank you for your efforts. jsFiddle: http://jsfiddle.net/BadDB

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  • numeric choice field:How to let the user set a value by incrementing/decrementing the displayed valu

    - by con_9
    Hi,I have a range say,1-100 and i want the user to select a value from this range.Ofcourse showing this with a spinner will be awful.I want to use the functionality of date widget,where we can pick a date by pressing a +/- sign,the longer the press ,higher the iteration speed. I found numberpicker.java that has the code the date widget uses to get this functionality, but do i have to paste that entire code to achieve this functionality!

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  • bulk insert from Java into Oracle

    - by Will Glass
    I need to insert many small rows rapidly into Oracle. (5 fields). With MySQL, I break the inserts into groups of 100, then use one insert statement for every group of 100 inserts. But with Oracle, user feedback is that the mass inserts (anywhere from 1000-30000) are too slow. Is there a similar trick I can use to speed up the programmatic inserts from Java into Oracle?

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  • Explain this PHP shorthand

    - by editor
    I feed like a goof but I don't entirely understand what's happening in this code: $var .= ($one || $two) ? function_one( $one, $another) : function_two( $two, $another); Does that say if $one or $two then $var is equal to fuction_one(), else function_two()? What's the purpose of using this syntax -- speed?

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  • explorer.exe opens slowly [closed]

    - by d9k
    explorer.exe opens veeeery slow when I press [Win+R] key or type "explorer ." in command prompt etc. But it opens with normal speed when I just click on the shortcut to any folder. When I click on the URL in IM like ICQ, already openned browser (firefox) takes too long to process link too. I have this problem for some months and I'm very tired of this. OS: WinXP SP3.

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  • 'rsync' is not recognized as an internal or external command, operable program or batch file

    - by user1688269
    I am VERY new to rsync and cygwin and I'm pretty sure I've installed everything correctly. I am trying to (for now) just rsync two Windows XP Laptops to tranfer files across from the one to the other to get a feel of it before I tackle bigger projects. This is the code I try use to transfer the files but I always get the same error. $ rsync -zrptL -v -e 'ssh -p 222' /tmp/rawr/ [email protected]:/tmp/play [email protected]'s password: 'rsync' is not recognized as an internal or external command, operable program or batch file. rsync: connection unexpectedly closed (0 bytes received so far) [sender] rsync error: error in rsync protocol data stream (code 12) at /home/lapo/package/rsync-3.0.9-1/src/rsync-3.0.9/io.c(605) [sender=3.0.9] What could be the problem? I am really stuck at the moment.

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  • Cannot enable network discovery on Windows Server 2008 R2

    - by dariom
    I'm trying to enable the Network Discovery feature on a newly installed Windows Server 2008 R2 instance. The network connection is in the Home or Work profile (it is not domain joined). These are the steps I've followed: Within the Network and Sharing Center I select Change advanced sharing settings Then I select the Turn on network discovery option for the current network profile (Home or Work) I then click Save changes If I then go back to the Advanced sharing settings screen the Turn off network discovery option is selected and the machine is not visible to others within the Network node in Windows Explorer. Things I've checked: I can ping the server and connect to it using the machine name/IP address. The Windows Firewall has exceptions for Network Discovery for both Private and Public networks. File and Printer sharing is enabled and I can transfer files to/from the server by connecting to the server using a UNC path. What am I missing here?

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  • SFTP - Unable to Overwrite File - "EOF received from remote side"

    - by NateReid
    I am working with a customer to troubleshoot an error they have when trying to overwrite/"PUT" a file to our SFTP site. When the root directory is empty and they try to upload the file there is no problem but when they try to overwrite an existing file this is when the error occurs. The error they receive when trying a put command in Java Caps is: The error is: Batch SFTP eWay error when doing data transfer operation in [PUT()], message=[EOF received from remote side [Unknown cause]].|#] When they use WinSCP or FileZilla to put the file it overwrites fine with no errors. We have tried: Multiple different files Checking their SFTP user permissions Gave full access permissions to "everyone" to the user's root directory in Windows Recreating their user account Ensured no other processes are using/locking the files that are being overwriten We are using Cerberus Professional FTP server software. Any ideas of what else we could try?

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  • Windows 7 upgrade on XP and Vista

    - by icc97
    I am upgrading a Windows XP (32-bit) machine and a Windows Vista (32-bit) machine to Windows 7 (32-bit). The most important files and accounts are on the Windows XP machine. What I would like to do is the following: backup the XP machine using Windows Easy Transfer upgrade the Windows Vista machine to a fresh install of Windows 7 install the XP backup on the Vista machine and see if everything is working Is this possible? I would have thought its possible as once the Vista machine is upgraded to Windows 7 it should be the same as if I had upgraded the XP machine, but I don't want to waste my time if its not. Thanks

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  • Windows 7 upgrade on XP and Vista

    - by icc97
    I am upgrading a Windows XP (32-bit) machine and a Windows Vista (32-bit) machine to Windows 7 (32-bit). The most important files and accounts are on the Windows XP machine. What I would like to do is the following: backup the XP machine using Windows Easy Transfer upgrade the Windows Vista machine to a fresh install of Windows 7 install the XP backup on the Vista machine and see if everything is working Is this possible? I would have thought its possible as once the Vista machine is upgraded to Windows 7 it should be the same as if I had upgraded the XP machine, but I don't want to waste my time if its not. Thanks

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  • How to migrate from Natara DayNotez for Pocket PC / Windows Mobile

    - by piggymouse
    I've been using DayNotez as my notes manager since the old Palm PDA days. When I moved to Windows Mobile, I installed DayNotez there and migrated from the Palm version. Now I wish to move from DayNotez altogether (I currently consider Evernote as a decent cross-platform tool). Problem is, DayNotez doesn't let me export the notes (unless I want to transfer them one by one, which is a pain). Natara offers an export tool for Windows, but it only works for Palm HotSync (as it reads from the backed-up PDB file). DayNotez Desktop for Windows stores its local DB under "My Documents\Natara\DayNotez\" directory in a file named "[device name] DayNotez.dnz". Quick look within the file spots a string "Standard Jet DB" near the beginning, but I couldn't open it as a regular JET/MDB file. Any help would be greatly appreciated.

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  • Dovecot: doveadm move command syntax

    - by vincent
    I want to transfer an email from [email protected] to put it in a folder of another user: [email protected] For that, it seems to me appropriate to use 'doveadm move' command, but I can not get the right result. Can you help me? syntax: doveadm move [-u |-A] [-S ] [user ] my attempts: doveadm move -u [email protected] DIRECTORY_2 mailbox [email protected]:'DIRECTORY_1' all return: Error: Syncing mailbox [email protected]:DOSSIER_1 failed: Mailbox doesn't exist: [email protected]:DOSSIER_1 doveadm -u [email protected] DIRECTORY_2 mailbox sdbox:/complete/path/[email protected]/mailboxes/DIRECTORY_1 all return: Error: Syncing mailbox sdbox:/complete/path/[email protected]/mailboxes/DIRECTORY_1 failed: Mailbox doesn't exist: sdbox:/complete/path/[email protected]/mailboxes/DIRECTORY_1 doveadm move -u [email protected] DIRECTORY_2 mailbox [email protected] 'DIRECTORY_2' all return: Fatal: Unknown argument DIRECTORY_2 some details: directory exists the following command works (in case 'DIRECTORY_1' and 'DIRECTORY_2' are in the [email protected] user): doveadm move -u [email protected] DIRECTORY_2 mailbox 'DIRECTORY_1' ALL my problem is that I can not put another user destination

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  • HP D2D 4312 Bacula configuration

    - by krisdigitx
    I have configured 5 libraries on the HP D2D system Discovery on the Bacula server shows only the last library and not all libraries. Why? [root@server bacula]# iscsiadm --mode discovery --type sendtargets --portal 10.66.59.114 10.66.59.114:3260,1 iqn.1986-03.com.hp:storage.d2dbs.czj2020vvy.50014380075dca5e.library12.drive1 10.66.59.114:3260,1 iqn.1986-03.com.hp:storage.d2dbs.czj2020vvy.50014380075dcaf2.library12.robotics I can query it fine using... [root@server bacula]# mtx -f /dev/sg2 inquiry Product Type: Tape Drive Vendor ID: 'HP ' Product ID: 'Ultrium 5-SCSI ' Revision: 'ED51' Attached Changer API: No [root@bray bacula]# mtx -f /dev/sg3 inquiry Product Type: Medium Changer Vendor ID: 'HP ' Product ID: 'MSL G3 Series ' Revision: 'EL41' Attached Changer API: No [root@server bacula]# mtx -f /dev/sg3 status Storage Changer /dev/sg3:1 Drives, 97 Slots ( 1 Import/Export ) Data Transfer Element 0:Empty Storage Element 1:Full :VolumeTag=50507F82 Storage Element 2:Full :VolumeTag=50507F83 Storage Element 3:Full :VolumeTag=50507F84 Storage Element 4:Full :VolumeTag=50507F85 Storage Element 5:Full :VolumeTag=50507F86 Storage Element 6:Full :VolumeTag=50507F87 Storage Element 7:Full :VolumeTag=50507F88 Does anyone have any good documentation for implementing Bacula with an HP D2D tape drive for server backups, and how to allocate libraries?

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