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• ctypes and pointer manipulation

  - by Chris

  I am dealing with image buffers, and I want to be able to access data a few lines into my image for analysis with a c library. I have created my 8-bit pixel buffer in Python using create_string_buffer. Is there a way to get a pointer to a location within that buffer without re-creating a new buffer? My goal is to analyze and change data within that buffer in chunks, without having to do a lot of buffer creation and data copying. In this case, ultimately, the C library is doing all the manipulation of the buffer, so I don't actually have to change values within the buffer using Python. I just need to give my C function access to data within the buffer.

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• FileNotFound exception when trying to write to a file

  - by Chris Knight

  OK, I'm feeling like this should be easy but am obviously missing something fundamental to file writing in Java. I have this: File someFile = new File("someDirA/someDirB/someDirC/filename.txt"); and I just want to write to the file. However, while someDirA exists, someDirB (and therefore someDirC and filename.txt) do not exist. Doing this: BufferedWriter writer = new BufferedWriter(new FileWriter(someFile)); throws a FileNotFoundException. Well, er, no kidding. I'm trying to create it after all. Do I need to break up the file path into components, create the directories and then create the file before instantiating the FileWriter object?

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• Transferring a flat file database to a MySQL database

  - by Jon

  I have a flat file database (yeah gross I know - the worst part is that it's 1.4GB), and I'm in the process of moving it to a MySQL database. The problem is that I'm not sure how to go about doing this - and I've checked through every related question on here but none relate to what I want to do, nor how my database is currently setup. My current flat file database is setup to where a normal MySQL row is its own file, and a MySQL table would be the directory. So for example if you have a user named Jon, there would be a file for the user in a directory named /members/. Within that file would be various information for the user including the users id, rank etc - all separated by tabs, all on separate lines (userid\t4). So here's an example user file: userid 4 notes staff notes: bla bla staff2 notes: bla bla bla username Example So how can I convert the above into their own rows and fields in MySQL? And if possible, could I do thousands of these files at once? Thanks.

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• file reading in python

  - by Jagdev

  So my whole problem is that I have two files one with following format(for Python 2.6): #comments config = { #comments 'name': 'hello', 'see?': 'world':'ABC',CLASS=3 } This file has number of sections like this. Second file has format: [23] [config] 'name'='abc' 'see?'= [23] Now the requirement is that I need to compare both files and generate file as: #comments config = { #comments 'name': 'abc', 'see?': 'world':'ABC',CLASS=3 } So the result file will contain the values from the first file, unless the value for same attribute is there in second file, which will overwrite the value. Now my problem is how to manipulate these files using Python. Thanks in advance and for your previous answers in short time ,I need to use python 2.6

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• C# File.ReadAllLines not breaking on line feeds

  - by David Dickerson

  Hello, I have an application that I am building that needs to modify a configuration file. My problem is that I am not able to read the file in line by line. I keep geeting the the entire file as a single string. string ConfigTemplate = AEBuildsSPFolderName + "\Template_BuildReleaseScript.Config"; string[] fileSourceLines = File.ReadAllLines(ConfigTemplate, Encoding.Default); --Returns the entire file contents into the first array element. using (StreamReader reader = new StreamReader(ConfigTemplate)) { string line; while ((line = reader.ReadLine()) != null) --Returns the entire file contents into the first line read. Any idea of what I am doing wrong? Thanks, david

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• Load binary file using fstream

  - by Kirill V. Lyadvinsky

  I'm trying to load binary file using fstream in the following way: #include <iostream #include <fstream #include <iterator #include <vector using namespace std; int main() { basic_fstream<uint32_t file( "somefile.dat", ios::in|ios::binary ); vector<uint32_t buffer; buffer.assign( istream_iterator<uint32_t, uint32_t( file ), istream_iterator<uint32_t, uint32_t() ); cout << buffer.size() << endl; return 0; } But it doesn't work. In Ubuntu it crashed with std::bad_cast exception. In MSVC++ 2008 it just prints 0. I know that I could use file.read to load file, but I want to use iterator and operator>> to load parts of the file. Is that possible? Why the code above doesn't work?

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• PHP is unable to open a file for writing - but it does exist

  - by asdasdas

  I am trying to write to a file. I do a file_exists check on it before i do fopen and it comes up true: the file does exist. However, the file fails this code and gives me the error every time: $handle = fopen($filename, 'w'); if($handle) { flock($handle, LOCK_EX); fwrite($handle, $contents); } else { echo 'ERROR: Unable to open the file for writing.',PHP_EOL; exit(); } flock($handle, LOCK_UN); fclose($handle); Is there a way I can get more specific error details as to why this file does not let me open it for writing? I know that the filename is legit, but for some reason it just wont let me write to it. I do have write permissions, I was able to write and write over another file.

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• Apache and linux file permissions

  - by morpheous

  I recently moved a Symfony 1.3.2 website (a PHP web framework), from a windows machine to Linux (Ubuntu 9.10). Ever since then, I have had all kinds of problems involving file permission (even though the app run without any of these problems on windows). I run symfony fix-perms which applied a 777 mask to the web directory (presumably, including its sub folders) - (as an aside) I think that is a potential security hole ... I have been meaning to come in here to ask how to correctly set permissions. Currently, when attempting to save a file from my website, I am getting the following error: PHP Warning: imagejpeg() [0function.imagejpeg0]: Unable to open '/home/morpheous/work/webdev/frameworks/symfony/sites/project1/web/uploads/../images/thumbnail/959cd604cf6115014a3703bef5a50486a5520642.jpg' for writing: Permission denied in /home/morpheous/work/webdev/frameworks/symfony/sites/project1/apps/frontend/lib Here are the permissions on the folders: web drwxr-xr-x 16 morpheous morpheous 4096 2010-02-24 21:01 web web/uploads/../images drwxr-xr-x 13 morpheous morpheous 12288 2010-04-09 15:25 images web/uploads/../images/thumbnail drwxr-xr-x 3 morpheous morpheous 4096 2010-02-24 20:44 thumbnail Can someone kindly tell me how to set the permissions so that my website (presumably running as the Apache daemon) can write the files to the directory required above?

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• Unable to create linen from mapped file console error

  - by TheLearner

  Does anyone know what the following logged error messages from console is all about - I am trying to track down the cause of a kernal panic I experienced yesterday: 13/01/2011 09:59:26 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:26 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:26 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:26 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:26 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:26 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:26 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file 13/01/2011 09:59:27 SpringBoard[2048] Unable to create linen from mapped file

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• How to access Windows Server 2008 R2 file shares from a different subnet

  - by Lloyd Cotten

  We have a couple of severs that used to be Windows Server 2003 that we recently upgraded to Windows Server 2008 R2. A couple of details to set the situation up: We wiped the OS and re-installed. These servers are on one subnet (172.16.x.x) and we are trying to access some file shares on them from another subnet (10.34.x.x). Firewall is disabled on these servers. Trying to access with UNC "\172.16.x.x\sharename" and net use \172.16.x.x However, we're having problems doing this. We are getting "The network path was not found". Here's some of the things we've tried so far and the result: Tried accessing the share from other (non-2008) servers on the same subnet... Success! Ping servers from different subnet... Success! Telnet connection into port 139 from different subnet... Success! Took a scan through Local Security Policies to see if something obvious needed to be enabled / disabled / configured... Fail I'm not sure where to look next. I know that the router between the two subnets is locked down pretty good, but this did work for our 2003 servers. Has anything changed in the way of ports used for UNC / file share access in 2008? Maybe I'm missing some security policy setting? Hoping somebody can take pity on a poor programming guy that can't figure out something really simple. :-) Thanks!

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• File permissions question

  - by Matthew Robert Keable

  I just switched my site's server from Windows to Linux, and am finally able to control file permissions from my ftp. So, seeing that all permissions were 705 by default (and not wanting just anyone to have permission to execute), I went and changed everything to 744. Now, gif and jpg links don't work, pdf download links don't work, php links don't load, and mov files don't play. Conversely, all html files work perfectly. Setting things back doesn't seem to help. Even setting to 777 gets me nowhere. Any ideas on what might be going wrong? I've been googling file permissions all day (solved that problem with the Windows-Linux switch, which has bred a new problem), and I don't think anything I can find has escaped my attention. The site: absis-minas.com Go easy on a n00b. I took up learning php out of interest, and wound up delving into server management issues due to a very simple line of code not working the way it was supposed to. Thanks!

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• Changing resource file in new version of an app

  - by Michael Frost

  Hi, I'm working on an update for an already existing iphone app. The existing version contains a .sql database file which is used in the app. I would like to use a new version of this file in the update of the app. On the first startup of the existing app the .sql file is placed in the caches directory of the users iphone. From what I can understand from Apple's documentation the files in the caches directory might get copied from the old app to the new versions caches directory when the user updates the app. Does this mean that for being sure my new file is used in the updated version I should use a different name of the file? And what happens with the old file? Do I have to manually delete it from inside the app? Which means I have to check if it's there at every startup of the app? Thanks Michael

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• Balanced File Distribution from server to client

  - by Abhinav

  To design a client-server code in LINUX where server will send the file equally to its entire client connected(all not at a time). Suppose 15 files are there, client1 makes a connection, server starts sending files to it. After 4 files a new connection comes the first client gets halted (not terminated) and client2 start getting the file. After 2 files another connection comes. Server starts sending file to client3. after sending 3[2(client2)+1] files, server resumes client2.then client2 & client3 goes on till file count reaches 4.then client1 wakeup & remaining 3 files are transferred to each 3 clients. File's name are pre written in a file from where server reads it(not a big deal)

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• Windows EFS file sharing anomaly

  - by wbkang

  Fyi, I can confirm this happening in Windows Vista (Business) and Windows 7 Professional in WORKGROUP mode (as both a client and a server). I am not totally sure if this is a Superuser question or a ServerFault question. So there are two PCs, let's call them C (client) and S (server). Both servers have a user called U with the same password. Both C and S has the same private/public key pair for EFS. S shares a folder F with U given full permission. Also locally, the user U has the full permission on F. Now, U, from C, connects to F at the server S, everything works totally fine. I can read,write, delete files and create/delete folders in S. Things go weird from here. I encrypt the folder F in S. I can delete/modify files fine (so the files in F decrypted OK). However, U from C, cannot create a folder, or create a file getting Access Denied. But this Access Denied is very special. It takes over 10 seconds at C to receive the error and the explorer freezes while trying to create a folder, eventually returning error. In S, I can watch the folder created at the same time, and what I see is "New Folder" blinking like crazy and eventually disappearing when the client receives the error. i.e. it's created and deleted in a really rapid manner. What I do not understand is that permissions look fine, I can modify/delete files, and it looks like there is no problem with EFS because I can read/write files fine. Yet it fails to create a file or a folder. Any help is appreciated. Thanks, wbkang

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• Tool to Save a Range of Disk Clusters to a File

  - by Synetech inc.

  Hi, Yesterday I deleted a (fragmented) archive file only to find that it did not extract correctly, so I was left stranded. Fortunately there was not much space free on the drive, so most of the space marked as free was from the now-deleted archive. I pulled up a disk editor and—painfully—managed to get a list of cluster ranges from the FAT that were marked as unused. My task then was to save these ranges of clusters to files so that I could examine them to try to determine which parts were from the archive and recombine them to attempt to restore the deleted file. This turned out to be a huge pain in the butt because the disk editor did not have the ability to select a range of clusters, so I had to navigate to the start of each cluster and hold down Ctrl+Shift+PgDn until I reached the end of the range (which usually took forever!) I did a quick Google search to see if I could find a command-line tool (preferably with Windows and DOS versions) that would allow me to issue a commands such as: SAVESECT -c 0xBEEF 0xCAFE FOO.BAR ::save clusters 0xBEEF-0xCAFE to FOO.BAR SAVESECT -s 1111 9876 BAZ.BIN ::save sectors 1111-9876 to BAZ.BIN Sadly my search came up empty. Any ideas? Thanks!

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• File Replication Service Errors

  - by ekamtaj

  Hey Guys, We have a windows 2003 r2 server and couple of the users are reporting that they can not scan files into the windwos server. They are getting an Out of Space errors. I took a look at the server and we have 600GB free disk space on that partition. But while looking at the event log I found a lot of errors like (13552,13555) The File Replication Service is unable to add this computer to the following replica set: "DOMAIN SYSTEM VOLUME (SYSVOL SHARE)" This could be caused by a number of problems such as: -- an invalid root path, -- a missing directory, -- a missing disk volume, -- a file system on the volume that does not support NTFS 5.0 The information below may help to resolve the problem: Computer DNS name is "server.domain.local" Replica set member name is "server" Replica set root path is "c:\windows\sysvol\domain" Replica staging directory path is "c:\windows\sysvol\staging\domain" Replica working directory path is "c:\windows\ntfrs\jet" Windows error status code is FRS error status code is FrsErrorMismatchedJournalId Other event log messages may also help determine the problem. Correct the problem and the service will attempt to restart replication automatically at a later time. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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• Mule Performing a string manipulation

  - by user2910309

  What is the best way to perform a string manipulation. I wish to perform a substring on a email address to extract the domain detail and populate this to a variable. a java transformer is a possibilty, but i was hoping if i could use a message enricher with a expression to perform this operation. pardon me but i am still a greenhorn on Mule. here is the excerpt from my mule flow which is failing with error cannot resolve method string length. <enricher target="#[flowVars['FromAddressDomain']]" doc:name="Message Enricher"> <expression-transformer expression="#[ payload.fromAddr.substring(payload.fromAddr.lastIndexOf('@')+ 1,payload.fromAddr.lenth())]" doc:name="Expression"></expression-transformer> </enricher>

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• java get file paths

  - by user283188

  hey everybody, I have a jsp page which contains the code which prints all files in a given directory and their file paths. The code is if (dir.isDirectory()) { File[] dirs = dir.listFiles(); for (File f : dirs) { if (f.isDirectory() && !f.isHidden()) { File files[] = f.listFiles(); for (File d : files) { if (d.isFile() && !d.isHidden()) { System.out.println(d.getName()+ d.getParent() + (d.length()/1024)); } } } if (f.isFile() && !f.isHidden()) { System.out.println(f.getName()+ f.getParent() + (f.length()/1024)); } } } The problem is that it prints the complete file path, which when accessed from tomcat is invalid. For example, the code spits out the following path: /usr/local/tomcat/sites/web_tech/images/scores/blah.jpg and I want it to only print the path up to /images ie /images/scores/blah.jpg I know I could just mess around with an actual string, ie splitting it or string matching, but is there an easier way to do it? Thanks

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• How can I delete a file created and opened with Perl's IO::File and XML::Writer?

  - by Sho Minamimoto

  So I'm running through a list of things and have code that creates an .xml files with IO::File called $doc, then I make a new writer with XML::Writer(OUTPUT => $doc). More code runs and I build a big XML file with XML::Writer. Then, near the end of the file, I find out if I need this file at all. If I do need it, I just: $writer->end(); $doc->close(); but if I don't need it, what should I enter to just delete all data I've stored/saved and move onto the next file? I tried unlink($docpath) (before and after $doc->close()), the file was not deleted.

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• Basic date/time manipulation in NHiberate query

  - by Yann Trevin

  I'm trying to restrict my NHibernate query with some basic date/time manipulation. More specifically, I want to execute the following statement (pseudo-SQL): select * from article where created_on + lifespan >= sysdate with: created_on is mapped to a property of type DateTime. lifespan is mapped to a property of type TimeSpan. sysdate is the current date/time (of the database server or ofthe application host, I don't care) Is there any built-in way to do that by using the Criteria-API or HQL? return session .CreateCriteria<Article>() .Add( ? ) .List<Article>();

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• string manipulation without alloc mem in c

  - by Mike

  I'm wondering if there is another way of getting a sub string without allocating memory. To be more specific, I have a string as: const char *str = "9|0\" 940 Hello"; Currently I'm getting the 940, which is the sub-string I want as, char *a = strstr(str,"9|0\" "); char *b = substr(a+5, 0, 3); // gives me the 940 Where substr is my sub string procedure. The thing is that I don't want to allocate memory for this by calling the sub string procedure. Is there a much easier way?, perhaps by doing some string manipulation and not alloc mem. I'll appreciate any feedback.

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• Unable to open a file for writing

  - by asdasdas

  I am trying to write to a file. I do a file_exists check on it before I do fopen and it returns true (the file does exist). However, the file fails this code and gives me the error every time: $handle = fopen($filename, 'w'); if($handle) { flock($handle, LOCK_EX); fwrite($handle, $contents); } else { echo 'ERROR: Unable to open the file for writing.',PHP_EOL; exit(); } flock($handle, LOCK_UN); fclose($handle); Is there a way I can get more specific error details as to why this file does not let me open it for writing? I know that the filename is legit, but for some reason it just wont let me write to it. I do have write permissions, I was able to write and write over another file.

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• Reverse massive text file in Java

  - by DanJanson

  What would be the best approach to reverse a large text file that is uploaded asynchronously to a servlet that reverses this file in a scalable and efficient way? text file can be massive (gigabytes long) can assume mulitple server/clustered environment to do this in a distributed manner. open source libraries are encouraged to consider I was thinking of using Java NIO to treat file as an array on disk (so that I don't have to treat the file as a string buffer in memory). Also, I am thinking of using MapReduce to break up the file and process it in separate machines. Any input is appreciated. Thanks. Daniel

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• Efficient way to delete a line from a text file (C#)

  - by Valentin Vasilyev

  Hello. I need to delete a certain line from a text file. What is the most efficient way of doing this? File can be potentially large(over million records). Thank you. UPDATE: below is the code I'm currently using, but I'm not sure if it is good. internal void DeleteMarkedEntries() { string tempPath=Path.GetTempFileName(); using (var reader = new StreamReader(logPath)) { using (var writer = new StreamWriter(File.OpenWrite(tempPath))) { int counter = 0; while (!reader.EndOfStream) { if (!_deletedLines.Contains(counter)) { writer.WriteLine(reader.ReadLine()); } ++counter; } } } if (File.Exists(tempPath)) { File.Delete(logPath); File.Move(tempPath, logPath); } }

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• repeated entries in website log file

  - by Reza

  I am writing an ad hoc log analyser for my website log file. The following is part of the log file in which it shows file1.pdf has been downloaded twice. Looking carefully, the time stamp and IP address are exactly the same in both entries. How can it be possible to have 2 downloads at the same time by the same person. Should I count it as 2 in my programme or as 1? Any reply is appreciated. name_of_subdomain xxx.xxx.xx.xx - - [02/Apr/2012:09:13:31 +0100] "GET /file1.pdf HTTP/1.1" 206 3706 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; CMDTDF)" name_of_subdomain xxx.xxx.xx.xx - - [02/Apr/2012:09:13:31 +0100] "GET /file1.pdf HTTP/1.1" 206 425462 "-" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; CMDTDF)"

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