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• Big Oh notation does not mention constant value

  - by user883561

  I am a programmer and have just started reading Algorithms. I am not completely convinced with the notations namely Bog Oh, Big Omega and Big Theta. The reason is by definition of Big Oh, it states that there should be a function g(x) such that it is always greater than or equal to f(x). Or f(x) <= c.n for all values of n n0. My doubt is the why dont we mention the constant value in the definition? For example. lets say a function 6n+4, we denote it as O(n). but its not true that the definition holds good for all constant value. this holds good only when c = 10 and n = 1. For lesser values of c than 6, the value of n0 increases. So why we do not mention the constant value as a part of the definition.

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• negative time for a ping echo reply

  - by Mario

  I was happily pinging in the net when suddenly: Pinging X with 32 bytes of data: Reply from .235: bytes=32 time=1444ms TTL=41 Reply from .235: bytes=32 time=1767ms TTL=41 Reply from .235: bytes=32 time=1531ms TTL=41 Reply from .235: bytes=32 time=-1198187ms TTL=41 Ping statistics for .235: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 1444ms, Maximum = -1198187ms, Average = 1073443462ms A negative time for the reply. I checked wireshark and it had the same values: Time delta from previous displayed frame: -1198.187867000 seconds Time since reference or first frame: -1179.935038000 seconds I didn't change the time of the machine while pinging. This was made in my local network at home, from a XP VM in windows 7. So I blame the VM (virtualbox). But I was wondering if this strange behaviour (to me) could have a reason, or if any of you have seen this before. Thank you bye.

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• Windows 7 loses correct time zone upon reboot

  - by Android Eve

  I have a standard PC running Windows 7 Ultimate (64-bit). For some reason, it refuses to keep the correct time zone (the BIOS battery is OK) when restarted. Note (1): The Time zone is correct. The "Internet Time" tab also shows "this computer is set to automatically synchronize with 'time.windows.com'. When I click the 'Change settings...' button, the 'Synchronize with an Internet time server' checkbox is checked. Still, upon reboot, the time is skewed by 6 hours... and doesn't correct itself even after waiting hours for this "automatically synchronize" to occur. Note (2): The BIOS time is set to local (i.e. not UTC). When I restart Windows 7 without booting to the other OS installed in dual-boot config (Ubuntu Linux), it seems to correctly remember the time. This may explain immediate time upon reboot, but it doesn't explain why Windows 7 won't automatically 'Synchronize with an Internet time server' even after an hour. Why is this happening and how do I correct this?

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• How I can compile this C++ code that fails with "'::main' must return 'int'"? [migrated]

  - by krisu

  I have tried to find a solution that make batch file start flashing on taskbar and only good solution was this post on Stack Overflow. But I can't compile the code with WinGW or anything else to EXE, only getting this error: hello.cpp:6:32: error: '::main' must return 'int' Right now, I'm using TDM-GCC to compile code, because it's bit better... Can somebody give me code that actually works or even better compile it to EXE already? P.S. Even more better if somebody could compile this Delphi code, because I can't find any software that's free.

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• Compile-time lookup array creation for ANSI-C?

  - by multiproximus

  A previous programmer preferred to generate large lookup tables (arrays of constants) to save runtime CPU cycles rather than calculating values on the fly. He did this by creating custom Visual C++ projects that were unique for each individual lookup table... which generate array files that are then #included into a completely separate ANSI-C micro-controller (Renesas) project. This approach is fine for his original calculation assumptions, but has become tedious when the input parameters need to be modified, requiring me to recompile all of the Visual C++ projects and re-import those files into the ANSI-C project. What I would like to do is port the Visual C++ source directly into the ANSI-C microcontroller project and let the compiler create the array tables. So, my question is: Can ANSI-C compilers compute and generate lookup arrays during compile time? And if so, how should I go about it? Thanks in advance for your help!

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• how to compile f# on mono

  - by leon

  I am trying to compile this example in mono on ubuntu. However I get the error wingsit@wingsit-laptop:~/MyFS/kitty$ fsc.exe -o kitty.exe kittyAst.fs kittyParser.fs kittyLexer.fs main.fs Microsoft (R) F# 2.0 Compiler build 2.0.0.0 Copyright (c) Microsoft Corporation. All Rights Reserved. /home/wingsit/MyFS/kitty/kittyAst.fs(1,1): error FS0222: Files in libraries or multiple-file applications must begin with a namespace or module declaration, e.g. 'namespace SomeNamespace.SubNamespace' or 'module SomeNamespace.SomeModule' /home/wingsit/MyFS/kitty/kittyParser.fs(2,1): error FS0222: Files in libraries or multiple-file applications must begin with a namespace or module declaration, e.g. 'namespace SomeNamespace.SubNamespace' or 'module SomeNamespace.SomeModule' /home/wingsit/MyFS/kitty/kittyLexer.fsl(2,1): error FS0222: Files in libraries or multiple-file applications must begin with a namespace or module declaration, e.g. 'namespace SomeNamespace.SubNamespace' or 'module SomeNamespace.SomeModule' wingsit@wingsit-laptop:~/MyFS/kitty$ I am a newbie in F#. Is there something obvious I miss?

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• flex open source sdk compile error of samples on linux

  - by Oki

  I downloaded lastest version of flex open source sdk. I wanted to compile some samples specifically explorer example. At first build.sh gave me weird error and with little search I nailed it by converting all bash files and mxml files with dos2unix. It is file type error. However now I get this error ./build.sh Error: Could not resolve <mx:Script> to a component implementation. <mx:Script> When I execute build.sh, some of the samples give this weird error. I searched this error on the net, their solution is to add -Duser.language=en -Duser.region=US as jre parameters. However, this solution is for Turkish Windows XP. My system is Pardus, yet another linux distribution.

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• Makefile to compile both C and Java programs at the same time

  - by user342745

  I have three programs that need to be compiled at the same time, 2 written in C and 1 in java. I had all three working with the Makefile when they were in C, but then switched one of them to java... is there a way to compile all 3 at once with the same makefile? Here is my current Makefile: CC=gcc JC=javac JFLAGS= -g CFLAGS= -Wall -g -std=c99 LDFLAGS= -lm .SUFFIXES: .java .class .java.class: $(JC) $(JFLAGS) $*.java CLASSES = kasiski.java kentry.java ALL= ic ftable kasiski all: $(ALL) ic: ic.o kasiski: $(CLASSES:.java=.class) ftable: ftable.o ic.o: ic.c ic.h ftable.o: ftable.c ftable.h .PHONY: clean clean: rm -rf core* *.class *.o *.gch $(ALL)

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• C++ - checking if a class has a certain method at compile time

  - by jetwolf

  Here's a question for the C++ gurus out there. Is there a way to check at compile time where a type has a certain method, and do one thing if it does, and another thing if it doesn't? Basically, I have a template function template <typename T> void function(T t); and I it to behave a certain way if T has a method g(), and another way if it doesn't. Perhaps there is something that can be used together with boost's enable_if? Something like this: template <typename T> enable_if<has_method<T, g, void ()>, void>::type function(T t) { // Superior implementation calling t.g() } template <typename T> disable_if<has_method<T, g, void ()>, void>::type function(T t) { // Inferior implementation in the case where T doesn't have a method g() } "has_method" would be something that preferably checks both that T has a method named 'g', and that the method has the correct signature (in this case, void ()). Any ideas?

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• Enabling Hyper-V Integrated Services Time Sync Services versus Internet Time Synchronization

  - by cpuguru

  Should I deselect the "Synchronize with an Internet Time Server" checkbox under the VM's "Date and Time - Internet Time Settings" tab if the "Time Synchronization Service" for a Hyper-V-based Virtual Machine is enabled? One of the Integration Services that Hyper-V provides is the Time Synchronization Service, which can be enabled/disabled by going to a VM's Settings-Integration Services setting in the Management section. I believe this is checked by default. When you install a Windows Server 2008 OS in a VM on the Hyper-V server, it comes with the "Synchronize with an Internet Time Server" option set, pointing to "time.windows.com". I'd think that if the parent Hyper-V server is set to one time server, and the child VM is pointing to a different time server, there would be a momentary blip if the two are not spot on with their times when the synchronization services run. So the question is, which time sync service should I use? I'm assuming not both. And what is the advantage of one over the other? Note: This question assumes that the machines are not joined to a domain. If they were, the machines would also try to update their time against the domain controller with the primary domain controller role too, right? Thanks!

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• elisp compile, add a regexp to error detection

  - by Gauthier

  I am starting with emacs, and don't know much elisp. Nearly nothing, really. I want to use ack as a replacement of grep. These are the instructions I followed to use ack from within emacs: http://www.rooijan.za.net/?q=ack_el Now I don't like the output format that is used in this el file, I would like the output to be that of ack --group. So I changed: (read-string "Ack arguments: " "-i" nil "-i" nil) to: (read-string "Ack arguments: " "-i --group" nil "-i --group" nil) So far so good. But this made me lose the ability to click-press_enter on the rows of the output buffer. In the original behaviour, compile-mode was used to be able to jump to the selected line. I figured I should add a regexp to the ack-mode. The ack-mode is defined like this: (define-compilation-mode ack-mode "Ack" "Specialization of compilation-mode for use with ack." nil) and I want to add the regexp [0-9]+: to be detected as an error too, since it is what every row of the output bugger includes (line number). I've tried to modify the define-compilation-modeabove to add the regexp, but I failed miserably. How can I make the output buffer of ack let me click on its rows? --- EDIT, I tried also: --- (defvar ack-regexp-alist '(("[0-9]+:" 2 3)) "Alist that specifies how to match rows in ack output.") (setq compilation-error-regexp-alist (append compilation-error-regexp-alist ack-regexp-alist)) I stole that somewhere and tried to adapt to my needs. No luck.

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• How to compile ocaml to native code

  - by Indra Ginanjar

  i'm really interested learning ocaml, it fast (they said it could be compiled to native code) and it's functional. So i tried to code something easy like enabling mysql event scheduler. #load "unix.cma";; #directory "+mysql";; #load "mysql.cma";; let db = Mysql.quick_connect ~user:"username" ~password:"userpassword" ~database:"databasename"();; let sql = Printf.sprintf "SET GLOBAL EVENT_SCHEDULER=1;" in (Mysql.exec db sql);; It work fine on ocaml interpreter, but when i was trying to compile it to native (i'm using ubuntu karmic), neither of these command worked ocamlopt -o mysqleventon mysqleventon.ml unix.cmxa mysql.cmxa ocamlopt -o mysqleventon mysqleventon.ml unix.cma mysql.cma i also tried ocamlc -c mysqleventon.ml unix.cma mysql.cma all of them resulting same message File "mysqleventon.ml", line 1, characters 0-1: Error: Syntax error Then i tried to remove the "# load", so the code goes like this let db = Mysql.quick_connect ~user:"username" ~password:"userpassword" ~database:"databasename"();; let sql = Printf.sprintf "SET GLOBAL EVENT_SCHEDULER=1;" in (Mysql.exec db sql);; The ocamlopt resulting message File "mysqleventon.ml", line 1, characters 9-28: Error: Unbound value Mysql.quick_connect I hope someone could tell me, where did i'm doing wrong.

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• pdfLaTeX + memoir class compile error

  - by Sebastien

  Hi, I'm in the middle of writing my thesis, and was using KOMA-Script. The document compiles just fine. I stumbled upon the memoir class yesterday, and was thinking of giving it a try, so here I am trying to compile with this class instead of KOMA-Script. First compilation is OK On second compilation, the document would not build (./fourier/fourier.tex [98] ! Undefined control sequence. <argument> ... C\protect \noexpand \protect \bond \protect \noexpand \protec... l.1 \chapter {Homogénéisation numérique par transformée de Fourier rapide} ? It has apparently not connected to hyperlink (btw, I'm using memhfixc), since I've commented this one out. Here is the preamble of my document, any thoughts ? Thanks in advance, S %\documentclass[draft, 11pt, a4paper, chapterprefix]{scrreprt} \documentclass[draft, 11pt, a4paper]{memoir} \usepackage[authoryear, round]{natbib} \usepackage[french]{babel} \usepackage[latin1]{inputenc} \usepackage{pdfsync} \usepackage[version=3]{mhchem} \usepackage{pgf} \usepackage{microtype} \usepackage{txfonts} % Polices times \usepackage[notref, notcite]{showkeys} \usepackage{amsmath} \usepackage{amssymb} \usepackage[bvec]{sbmacros} \usepackage{micromechanics} \usepackage{pgfcad} %\usepackage[breaklinks=true]{hyperref} %\usepackage{memhfixc} % Pour assurer la compatibilité entre memoir et hyperref %\newcommand{\url}[1]{\texttt{#1}} % Options KOMA-Script % \addtokomafont{caption}{\small} % \pagestyle{headings}

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• Time not propagating to machines on Windows domain

  - by rbeier

  We have a two-domain Active Directory forest: ourcompany.com at the root, and prod.ourcompany.com for production servers. Time is propagating properly through the root domain, but servers in the child domain are unable to sync via NTP. So the time on these servers is starting to drift, since they're relying only on the hardware clock. WHen I type "net time" on one of the production servers, I get the following error: Could not locate a time-server. More help is available by typing NET HELPMSG 3912. When I type "w32tm /resync", i get the following: Sending resync command to local computer The computer did not resync because no time data was available. "w32tm /query /source" shows the following: Free-running System Clock We have three domain controllers in the prod.ourcompany.com subdomain (overkill, but the result of a migration - we haven't gotten rid of one of the old ones yet.) To complicate matters, the domain controllers are all virtualized, running on two different physical hosts. But the time on the domain controllers themselves is accurate - the servers that aren't DCs are the ones having problems. Two of the DCs are running Server 2003, including the PDC emulator. The third DC is running Server 2008. (I could move the PDC emulator role to the 2008 machine if that would help.) The non-DC servers are all running Server 2008. All other Active Directory functionality works fine in the production domain - we're only seeing problems with NTP. I can manually sync each machine to the time source (the PDC emulator) by doing the following: net time \\dc1.prod.ourcompany.com /set /y But this is just a one-off, and it doesn't cause automated time syncing to start working. I guess I could create a scheduled task which runs the above command periodically, but I'm hoping there's a better way. Does anyone have any ideas as to why this isn't working, and what we can do to fix it? Thanks for your help, Richard

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• Weird fluctuating time on a XEN linux guest

  - by Vin-G

  I have a weird problem with some servers here at work. We have a few XEN guests who's current time fluctuates. # date;date;date;date;date;date;date Thu Feb 25 16:00:40 PHT 2010 Thu Feb 25 16:00:48 PHT 2010 Thu Feb 25 16:00:40 PHT 2010 Thu Feb 25 16:00:48 PHT 2010 Thu Feb 25 16:00:40 PHT 2010 Thu Feb 25 16:00:48 PHT 2010 Thu Feb 25 16:00:40 PHT 2010 As seen above, the time fluctuates between 16:00:48 and 16:00:40, which is problematic for us since computing for time differences in some of our scripts becomes inaccurate (ex. what should be a few ms differences becomes some few second differences, and even sometimes, negative differences). The problematic servers are linux guests on a XEN host. The time fluctuates on the guest systems, but it is okay in the host itself. I've ruled out ntpd since this happens irregardless of whether ntpd is running or not on the guest systems. Guest is on full virtualisation. The time on both the host and the guest does match except that the time in the guest fluctuates at about a few seconds from the host's time, and the host time does not fluctuate. /proc/sys/xen/independent_wallclock is 0 in the host and does not exist in the guest. Ntpd service was stopped and disabled. Setting independent_wallclock to 1 in the host has no effect (that is, time still fluctuates in the guest). Though I was not able to restart the guest as it is a production server. Might be able to do that over the weekend. Any ideas on what to check and how to resolve this problem?

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• 11415 compile errors FTW?!

  - by Koning Baard

  Hello. This is something I've really never seen but, I downloaded the source code of the sine wave example at http://www.audiosynth.com/sinewavedemo.html . It is in an old Project Builder Project format, and I want to compile it with Xcode (GCC). However, Xcode gives me 11415 compile errors. The first few are (all in the precompilation of AppKit.h): /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:31:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:31: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:33:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:33: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:35:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:35: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:36:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:36: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:37:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:37: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:38:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:38: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:40:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:40: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:42:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:42: error: expected identifier or '(' before '@' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:48:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:48: error: expected identifier or '(' before '@' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:54:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:54: error: expected identifier or '(' before '@' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:59:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:59: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:61:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:61: error: expected identifier or '(' before '@' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:69:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:69: error: expected identifier or '(' before '+' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:71:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:71: error: expected identifier or '(' before '+' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:39:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:39: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:40:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:40: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:41:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:41: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:42:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:42: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:43:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:43: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:44:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:44: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:45:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:45: error: expected identifier or '(' before '-' token /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:46:0 /Developer/SDKs/MacOSX10.6.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSValue.h:46: error: expected identifier or '(' before '-' token Some of the code is: HAL.c /* * HAL.c * Sinewave * * Created by james on Fri Apr 27 2001. * Copyright (c) 2001 __CompanyName__. All rights reserved. * */ #include "HAL.h" #include "math.h" appGlobals gAppGlobals; OSStatus appIOProc (AudioDeviceID inDevice, const AudioTimeStamp* inNow, const AudioBufferList* inInputData, const AudioTimeStamp* inInputTime, AudioBufferList* outOutputData, const AudioTimeStamp* inOutputTime, void* device); #define FailIf(cond, handler) \ if (cond) { \ goto handler; \ } #define FailWithAction(cond, action, handler) \ if (cond) { \ { action; } \ goto handler; \ } // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // HAL Sample Code ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //#define noErr 0 //#define false 0 OSStatus SetupHAL (appGlobalsPtr globals) { OSStatus err = noErr; UInt32 count, bufferSize; AudioDeviceID device = kAudioDeviceUnknown; AudioStreamBasicDescription format; // get the default output device for the HAL count = sizeof(globals->device); // it is required to pass the size of the data to be returned err = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice, &count, (void *) &device); fprintf(stderr, "kAudioHardwarePropertyDefaultOutputDevice %d\n", err); if (err != noErr) goto Bail; // get the buffersize that the default device uses for IO count = sizeof(globals->deviceBufferSize); // it is required to pass the size of the data to be returned err = AudioDeviceGetProperty(device, 0, false, kAudioDevicePropertyBufferSize, &count, &bufferSize); fprintf(stderr, "kAudioDevicePropertyBufferSize %d %d\n", err, bufferSize); if (err != noErr) goto Bail; // get a description of the data format used by the default device count = sizeof(globals->deviceFormat); // it is required to pass the size of the data to be returned err = AudioDeviceGetProperty(device, 0, false, kAudioDevicePropertyStreamFormat, &count, &format); fprintf(stderr, "kAudioDevicePropertyStreamFormat %d\n", err); fprintf(stderr, "sampleRate %g\n", format.mSampleRate); fprintf(stderr, "mFormatFlags %08X\n", format.mFormatFlags); fprintf(stderr, "mBytesPerPacket %d\n", format.mBytesPerPacket); fprintf(stderr, "mFramesPerPacket %d\n", format.mFramesPerPacket); fprintf(stderr, "mChannelsPerFrame %d\n", format.mChannelsPerFrame); fprintf(stderr, "mBytesPerFrame %d\n", format.mBytesPerFrame); fprintf(stderr, "mBitsPerChannel %d\n", format.mBitsPerChannel); if (err != kAudioHardwareNoError) goto Bail; FailWithAction(format.mFormatID != kAudioFormatLinearPCM, err = paramErr, Bail); // bail if the format is not linear pcm // everything is ok so fill in these globals globals->device = device; globals->deviceBufferSize = bufferSize; globals->deviceFormat = format; Bail: return (err); } /* struct AudioStreamBasicDescription { Float64 mSampleRate; // the native sample rate of the audio stream UInt32 mFormatID; // the specific encoding type of audio stream UInt32 mFormatFlags; // flags specific to each format UInt32 mBytesPerPacket; // the number of bytes in a packet UInt32 mFramesPerPacket; // the number of frames in each packet UInt32 mBytesPerFrame; // the number of bytes in a frame UInt32 mChannelsPerFrame; // the number of channels in each frame UInt32 mBitsPerChannel; // the number of bits in each channel }; typedef struct AudioStreamBasicDescription AudioStreamBasicDescription; */ // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // This is a simple playThru ioProc. It simply places the data in the input buffer back into the output buffer. // Watch out for feedback from Speakers to Microphone OSStatus appIOProc (AudioDeviceID inDevice, const AudioTimeStamp* inNow, const AudioBufferList* inInputData, const AudioTimeStamp* inInputTime, AudioBufferList* outOutputData, const AudioTimeStamp* inOutputTime, void* appGlobals) { appGlobalsPtr globals = appGlobals; int i; double phase = gAppGlobals.phase; double amp = gAppGlobals.amp; double pan = gAppGlobals.pan; double freq = gAppGlobals.freq * 2. * 3.14159265359 / globals->deviceFormat.mSampleRate; int numSamples = globals->deviceBufferSize / globals->deviceFormat.mBytesPerFrame; // assume floats for now.... float *out = outOutputData->mBuffers[0].mData; for (i=0; i<numSamples; ++i) { float wave = sin(phase) * amp; phase = phase + freq; *out++ = wave * (1.0-pan); *out++ = wave * pan; } gAppGlobals.phase = phase; return (kAudioHardwareNoError); } // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ OSStatus StartPlayingThruHAL(appGlobalsPtr globals) { OSStatus err = kAudioHardwareNoError; if (globals->soundPlaying) return 0; globals->phase = 0.0; err = AudioDeviceAddIOProc(globals->device, appIOProc, (void *) globals); // setup our device with an IO proc if (err != kAudioHardwareNoError) goto Bail; err = AudioDeviceStart(globals->device, appIOProc); // start playing sound through the device if (err != kAudioHardwareNoError) goto Bail; globals->soundPlaying = true; // set the playing status global to true Bail: return (err); } // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ OSStatus StopPlayingThruHAL(appGlobalsPtr globals) { OSStatus err = kAudioHardwareNoError; if (!globals->soundPlaying) return 0; err = AudioDeviceStop(globals->device, appIOProc); // stop playing sound through the device if (err != kAudioHardwareNoError) goto Bail; err = AudioDeviceRemoveIOProc(globals->device, appIOProc); // remove the IO proc from the device if (err != kAudioHardwareNoError) goto Bail; globals->soundPlaying = false; // set the playing status global to false Bail: return (err); } Sinewave.m // // a very simple Cocoa CoreAudio app // by James McCartney [email protected] www.audiosynth.com // // Sinewave - this class implements a sine oscillator with dezippered control of frequency, pan and amplitude // #import "Sinewave.h" // define a C struct from the Obj-C object so audio callback can access data typedef struct { @defs(Sinewave); } sinewavedef; // this is the audio processing callback. OSStatus appIOProc (AudioDeviceID inDevice, const AudioTimeStamp* inNow, const AudioBufferList* inInputData, const AudioTimeStamp* inInputTime, AudioBufferList* outOutputData, const AudioTimeStamp* inOutputTime, void* defptr) { sinewavedef* def = defptr; // get access to Sinewave's data int i; // load instance vars into registers double phase = def->phase; double amp = def->amp; double pan = def->pan; double freq = def->freq; double ampz = def->ampz; double panz = def->panz; double freqz = def->freqz; int numSamples = def->deviceBufferSize / def->deviceFormat.mBytesPerFrame; // assume floats for now.... float *out = outOutputData->mBuffers[0].mData; for (i=0; i<numSamples; ++i) { float wave = sin(phase) * ampz; // generate sine wave phase = phase + freqz; // increment phase // write output *out++ = wave * (1.0-panz); // left channel *out++ = wave * panz; // right channel // de-zipper controls panz = 0.001 * pan + 0.999 * panz; ampz = 0.001 * amp + 0.999 * ampz; freqz = 0.001 * freq + 0.999 * freqz; } // save registers back to object def->phase = phase; def->freqz = freqz; def->ampz = ampz; def->panz = panz; return kAudioHardwareNoError; } @implementation Sinewave - (void) setup { OSStatus err = kAudioHardwareNoError; UInt32 count; device = kAudioDeviceUnknown; initialized = NO; // get the default output device for the HAL count = sizeof(device); // it is required to pass the size of the data to be returned err = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice, &count, (void *) &device); if (err != kAudioHardwareNoError) { fprintf(stderr, "get kAudioHardwarePropertyDefaultOutputDevice error %ld\n", err); return; } // get the buffersize that the default device uses for IO count = sizeof(deviceBufferSize); // it is required to pass the size of the data to be returned err = AudioDeviceGetProperty(device, 0, false, kAudioDevicePropertyBufferSize, &count, &deviceBufferSize); if (err != kAudioHardwareNoError) { fprintf(stderr, "get kAudioDevicePropertyBufferSize error %ld\n", err); return; } fprintf(stderr, "deviceBufferSize = %ld\n", deviceBufferSize); // get a description of the data format used by the default device count = sizeof(deviceFormat); // it is required to pass the size of the data to be returned err = AudioDeviceGetProperty(device, 0, false, kAudioDevicePropertyStreamFormat, &count, &deviceFormat); if (err != kAudioHardwareNoError) { fprintf(stderr, "get kAudioDevicePropertyStreamFormat error %ld\n", err); return; } if (deviceFormat.mFormatID != kAudioFormatLinearPCM) { fprintf(stderr, "mFormatID != kAudioFormatLinearPCM\n"); return; } if (!(deviceFormat.mFormatFlags & kLinearPCMFormatFlagIsFloat)) { fprintf(stderr, "Sorry, currently only works with float format....\n"); return; } initialized = YES; fprintf(stderr, "mSampleRate = %g\n", deviceFormat.mSampleRate); fprintf(stderr, "mFormatFlags = %08lX\n", deviceFormat.mFormatFlags); fprintf(stderr, "mBytesPerPacket = %ld\n", deviceFormat.mBytesPerPacket); fprintf(stderr, "mFramesPerPacket = %ld\n", deviceFormat.mFramesPerPacket); fprintf(stderr, "mChannelsPerFrame = %ld\n", deviceFormat.mChannelsPerFrame); fprintf(stderr, "mBytesPerFrame = %ld\n", deviceFormat.mBytesPerFrame); fprintf(stderr, "mBitsPerChannel = %ld\n", deviceFormat.mBitsPerChannel); } - (void)setAmpVal:(double)val { amp = val; } - (void)setFreqVal:(double)val { freq = val * 2. * 3.14159265359 / deviceFormat.mSampleRate; } - (void)setPanVal:(double)val { pan = val; } - (BOOL)start { OSStatus err = kAudioHardwareNoError; sinewavedef *def; if (!initialized) return false; if (soundPlaying) return false; // initialize phase and de-zipper filters. phase = 0.0; freqz = freq; ampz = amp; panz = pan; def = (sinewavedef *)self; err = AudioDeviceAddIOProc(device, appIOProc, (void *) def); // setup our device with an IO proc if (err != kAudioHardwareNoError) return false; err = AudioDeviceStart(device, appIOProc); // start playing sound through the device if (err != kAudioHardwareNoError) return false; soundPlaying = true; // set the playing status global to true return true; } - (BOOL)stop { OSStatus err = kAudioHardwareNoError; if (!initialized) return false; if (!soundPlaying) return false; err = AudioDeviceStop(device, appIOProc); // stop playing sound through the device if (err != kAudioHardwareNoError) return false; err = AudioDeviceRemoveIOProc(device, appIOProc); // remove the IO proc from the device if (err != kAudioHardwareNoError) return false; soundPlaying = false; // set the playing status global to false return true; } @end Can anyone help me compiling this example? I'd really appriciate it. Thanks

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• Changing time or offsetting it in OpenVZ contained server

  - by Milad Naseri

  I am trying to run a VPS, a Debian box contained in an OpenVZ container. Obviously, I cannot use time --set or any such command, as the time must be set via the parent node. The owner of the parent node, however refuses to adjust the time (which is 30 minutes slower than the actual time). All the programs on my system, consequently, now recognized the false time and this throws a wrench in my syncing. Is there a way to possibly change the system time without interference from the container's administrator? Or perhaps, failing that, a way to make the programs "see" the time 30 minutes faster than what is reported by the container?

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• Time randomly changing itself, internet randomly dying

  - by Vee

  Operating System MS Windows 8 Enterprise 64-bit CPU Intel Core i7 2700K @ 3.50GHz 45 °C Sandy Bridge 32nm Technology RAM 8,00 GB Dual-Channel DDR3 @ 800MHz (8-8-8-24) Motherboard ASRock Z77 Extreme4-M (CPUSocket) 40 °C Graphics SMXL2270HD (1920x1080@60Hz) M2094D-PZ (1680x1050@60Hz) 896MB GeForce GTX 275 (CardExpert Technology) 57 °C Hard Drives 466GB FUJITSU MAXTOR STM3500320AS (SATA) 39 °C Optical Drives ASUS DRW-2014L1T Audio High Definition Audio Device Hello everyone, I installed Windows 8 RTM a few weeks ago. It's not my first time installing it, but it's the first time having two annoying problems: 1) Randomly, the system clock changes time all by itself - to fix it I have to open the time window and sync it with the internet. 2) Randomly, internet connection stops working - to fix I have to run troubleshooting. Windows will find a problem with IP on the "Ethernet" connection and fix it. 3) In rare occasions, my PC freezes and I need to restart it (a BSOD once happened, but after that only freezes) How can I permanently solve these problems? This is what I've already tried: Reset Virus scan Stop/reset the Windows Time service Disable/re-enable Windows Time automatic internet sync Change time from BIOS Change motherboard battery

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• How do I convert a date/time to epoch time (aka unix time -- seconds since 1970) in Perl?

  - by dreeves

  Given a date/time as an array of (year, month, day, hour, minute, second), how would you convert it to epoch time, i.e., the number of seconds since 1970-01-01 00:00:00 GMT? Bonus question: If given the date/time as a string, how would you first parse it into the (y,m,d,h,m,s) array?

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• How to reduce compile time with C++ templates

  - by Shane MacLaughlin

  I'm in the process of changing part of my C++ app from using an older C type array to a templated C++ container class. See this question for details. While the solution is working very well, each minor change I make to the templated code causes a very large amount of recompilation to take place, and hence drastically slows build time. Is there any way of getting template code out of the header and back into a cpp file, so that minor implementation changes don't cause major rebuilds?

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• compile time if && return string reference optimization

  - by Truncheon

  Hi. I'm writing a series classes that inherit from a base class using virtual. They are INT, FLOAT and STRING objects that I want to use in a scripting language. I'm trying to implement weak typing, but I don't want STRING objects to return copies of themselves when used in the following way (instead I would prefer to have a reference returned which can be used in copying): a = "hello "; b = "world"; c = a + b; I have written the following code as a mock example: #include <iostream> #include <string> #include <cstdio> #include <cstdlib> std::string dummy("<int object cannot return string reference>"); struct BaseImpl { virtual bool is_string() = 0; virtual int get_int() = 0; virtual std::string get_string_copy() = 0; virtual std::string const& get_string_ref() = 0; }; struct INT : BaseImpl { int value; INT(int i = 0) : value(i) { std::cout << "constructor called\n"; } INT(BaseImpl& that) : value(that.get_int()) { std::cout << "copy constructor called\n"; } bool is_string() { return false; } int get_int() { return value; } std::string get_string_copy() { char buf[33]; sprintf(buf, "%i", value); return buf; } std::string const& get_string_ref() { return dummy; } }; struct STRING : BaseImpl { std::string value; STRING(std::string s = "") : value(s) { std::cout << "constructor called\n"; } STRING(BaseImpl& that) { if (that.is_string()) value = that.get_string_ref(); else value = that.get_string_copy(); std::cout << "copy constructor called\n"; } bool is_string() { return true; } int get_int() { return atoi(value.c_str()); } std::string get_string_copy() { return value; } std::string const& get_string_ref() { return value; } }; struct Base { BaseImpl* impl; Base(BaseImpl* p = 0) : impl(p) {} ~Base() { delete impl; } }; int main() { Base b1(new INT(1)); Base b2(new STRING("Hello world")); Base b3(new INT(*b1.impl)); Base b4(new STRING(*b2.impl)); std::cout << "\n"; std::cout << b1.impl->get_int() << "\n"; std::cout << b2.impl->get_int() << "\n"; std::cout << b3.impl->get_int() << "\n"; std::cout << b4.impl->get_int() << "\n"; std::cout << "\n"; std::cout << b1.impl->get_string_ref() << "\n"; std::cout << b2.impl->get_string_ref() << "\n"; std::cout << b3.impl->get_string_ref() << "\n"; std::cout << b4.impl->get_string_ref() << "\n"; std::cout << "\n"; std::cout << b1.impl->get_string_copy() << "\n"; std::cout << b2.impl->get_string_copy() << "\n"; std::cout << b3.impl->get_string_copy() << "\n"; std::cout << b4.impl->get_string_copy() << "\n"; return 0; } It was necessary to add an if check in the STRING class to determine whether its safe to request a reference instead of a copy: Script code: a = "test"; b = a; c = 1; d = "" + c; /* not safe to request reference by standard */ C++ code: STRING(BaseImpl& that) { if (that.is_string()) value = that.get_string_ref(); else value = that.get_string_copy(); std::cout << "copy constructor called\n"; } If was hoping there's a way of moving that if check into compile time, rather than run time.

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• Windows CE 6.0 time setting in registry being overrided

  - by JaminSince83

  I have asked this question on stack overflow but its probably better suited here. So I have a Motorola MC3190 Mobile Barcode scanning device with Windows CE 6.0. Now I want to get the device to sync its date/time on boot up with our domain controller using a registry file that I have created. I have used this registry file below to get close to what I require. REG 1 REGEDIT4 [HKEY_LOCAL_MACHINE\Services\TIMESVC] "UserProcGroup"=dword:00000002 "Flags"=dword:00000010 "multicastperiod"=dword:36EE80 "threshold"=dword:5265C00 "recoveryrefresh"=dword:36EE80 "refresh"=dword:5265C00 "Context"=dword:0 "Autoupdate" = dword:1 "server" = "NAMEOFMYSERVER" "ServerRole" = dword:0 "Trustlocalclock" = dword:0 "Dll"="timesvc.dll" "Keep"=dword:1 "Prefix"="NTP" "Index"=dword:0 [HKEY_LOCAL_MACHINE\nls] "DefaultLCID" = dword:00000809 [HKEY_LOCAL_MACHINE\nls\overrides] "LCID" = dword:00000809 [HKEY_LOCAL_MACHINE\Time] @ = "UTC" "TimeZoneInformation"=hex:\ 00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\ 00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00 [HKEY_LOCAL_MACHINE\Time Zones] @ = "UTC" [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Clock] "AutoDST" = dword:00000000 Now it gets the correct date and shows the time zone correctly however the time is always 5 hours behind on Eastern Standard Time, which is really annoying. I have researched heavily into this and this question has been asked before here As you will see I have copied what it suggests but it doesnt work. Something is overiding the time which I dont understand enough about to resolve. I cannot find any other setting to get it to set the time correctly. Any help would be greatly appreciated.

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• Compile error C++: could not deduce template argument for 'T'

  - by OneShot

  I'm trying to read binary data to load structs back into memory so I can edit them and save them back to the .dat file. readVector() attempts to read the file, and return the vectors that were serialized. But i'm getting this compile error when I try and run it. What am I doing wrong with my templates? ***** EDIT ************** Code: // Project 5.cpp : main project file. #include "stdafx.h" #include <iostream> #include <fstream> #include <string> #include <vector> #include <algorithm> using namespace System; using namespace std; #pragma hdrstop int checkCommand (string line); template<typename T> void writeVector(ofstream &out, const vector<T> &vec); template<typename T> vector<T> readVector(ifstream &in); struct InventoryItem { string Item; string Description; int Quantity; int wholesaleCost; int retailCost; int dateAdded; } ; int main(void) { cout << "Welcome to the Inventory Manager extreme! [Version 1.0]" << endl; ifstream in("data.dat"); vector<InventoryItem> structList; readVector<InventoryItem>( in ); while (1) { string line = ""; cout << endl; cout << "Commands: " << endl; cout << "1: Add a new record " << endl; cout << "2: Display a record " << endl; cout << "3: Edit a current record " << endl; cout << "4: Exit the program " << endl; cout << endl; cout << "Enter a command 1-4: "; getline(cin , line); int rValue = checkCommand(line); if (rValue == 1) { cout << "You've entered a invalid command! Try Again." << endl; } else if (rValue == 2){ cout << "Error calling command!" << endl; } else if (!rValue) { break; } } system("pause"); return 0; } int checkCommand (string line) { int intReturn = atoi(line.c_str()); int status = 3; switch (intReturn) { case 1: break; case 2: break; case 3: break; case 4: status = 0; break; default: status = 1; break; } return status; } template<typename T> void writeVector(ofstream &out, const vector<T> &vec) { out << vec.size(); for(vector<T>::const_iterator i = vec.begin(); i != vec.end(); i++) { out << *i; } } ostream& operator<<(std::ostream &strm, const InventoryItem &i) { return strm << i.Item << " (" << i.Description << ")"; } template<typename T> vector<T> readVector(ifstream &in) { size_t size; in >> size; vector<T> vec; vec.reserve(size); for(int i = 0; i < size; i++) { T tmp; in >> tmp; vec.push_back(tmp); } return vec; } Compiler errors: 1>------ Build started: Project: Project 5, Configuration: Debug Win32 ------ 1>Compiling... 1>Project 5.cpp 1>.\Project 5.cpp(124) : warning C4018: '<' : signed/unsigned mismatch 1> .\Project 5.cpp(40) : see reference to function template instantiation 'std::vector<_Ty> readVector<InventoryItem>(std::ifstream &)' being compiled 1> with 1> [ 1> _Ty=InventoryItem 1> ] 1>.\Project 5.cpp(127) : error C2679: binary '>>' : no operator found which takes a right-hand operand of type 'InventoryItem' (or there is no acceptable conversion) 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(1144): could be 'std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,signed char *)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(1146): or 'std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,signed char &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(1148): or 'std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,unsigned char *)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(1150): or 'std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,unsigned char &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(155): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::basic_istream<_Elem,_Traits> &(__cdecl *)(std::basic_istream<_Elem,_Traits> &))' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(161): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::basic_ios<_Elem,_Traits> &(__cdecl *)(std::basic_ios<_Elem,_Traits> &))' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(168): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::ios_base &(__cdecl *)(std::ios_base &))' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(175): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::_Bool &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(194): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(short &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(228): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned short &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(247): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(int &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(273): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned int &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(291): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(long &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(309): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(__w64 unsigned long &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(329): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(__int64 &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(348): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned __int64 &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(367): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(float &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(386): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(double &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(404): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(long double &)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(422): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(void *&)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream(441): or 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::basic_streambuf<_Elem,_Traits> *)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> while trying to match the argument list '(std::ifstream, InventoryItem)' 1>Build log was saved at "file://c:\Users\Owner\Documents\Visual Studio 2008\Projects\Project 5\Project 5\Debug\BuildLog.htm" 1>Project 5 - 1 error(s), 1 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== Oh my god...I fixed that error I think and now I got another one. Will you PLEASE just help me on this one too! What the heck does this mean ??

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• Correct way to textually report the remaining time on a long running process?

  - by Ryan

  So you have a long running process, perhaps with a progress bar, and you want a text estimate of the remaining time, eg: "5 minutes remaining" "30 seconds remaining" etc. If you don't actually want to report clock time (due to accuracy or resolution or update-rate issues) but want to stick to the text summary, what is the correct paradigm? Is "one minute" left displayed from 0 to 60 seconds? or from 1:00 to 1:59? Say there's 1:35 Left - is that "2 minutes remaining" or "1 minute remaining"? Do you just pare it down to "A few minutes left" when you're less than 3 minutes? What is the preferred (least user-frustrating) method?

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• Remotely sync Time Machine drives

  - by Off Rhoden

  I have an Xserve that runs Time Machine to a local terabyte drive. I also connected my external terabyte drive for a time period and had Time Machine use it to establish the seed data. I plan to take my drive back home with me (out of state) and have the Xserve return to using its local drive for Time Machine. But when I get back home, is there a way to keep my external drive's copy of the Time Machine Backups folder in sync with the Backups folder back on the Xserve? I'm wanting a full copy of the history (makes an awesome remote backup). I've thought of using the unix command rsync. In fact, that's how I had been doing it but I was looking the compactness that Time Machine was able to achieve. Thanks.

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