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• Read characters from a text file using bash

  - by Simon Hodgson

  Does anyone know how I can read the first two characters from a file, using a bash script. The file in question is actually an I/O driver, it has no new line characters in it, and is in effect infinitely long.

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• Cannot run fopen() or file_get_contents()

  - by Obay

  Hi, When I use fopen() or file_get_contents(), I get the following error: Warning: fopen(URL_OF_FILE_HERE) [function.fopen]: failed to open stream: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. in…

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• Using fgets to read strings from file in C

  - by Ivan

  I am trying to read strings from a file that has each string on a new line but I think it reads a newline character once instead of a string and I don't know why. If I'm going about reading strings the wrong way please correct me. i=0; F1 = fopen("alg.txt", "r"); F2 = fopen("tul.txt", "w"); if(!feof(F1)) { do{ //start…

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• High PageIOLatch_SH Waits with High Drive Idle times

  - by Marty Trenouth

  We are experiencing high volume of PageIOLatch_SH waits on our database (row counts in the Billions). However it seems that our drive Idle time Percentage hovers around 50-60 percent. CPU usage is nill. The Database Tuning Advisor gives no suggestions for optimization. The query plan (actual) from the single stored procedure used…

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• fstream - correct error checking after output

  - by Truncheon

  What's the correct way to check for a general error when sending data to an fstream? I have the following code, which seems a bit overkill. int Saver::output() { save_file_handle.open(file_name.c_str()); if (save_file_handle.is_open()) { save_file_handle << save_str.c_str(); if…

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• Show Hexadecimal Numbers Of a File

  - by Nathan Campos

  I want to build a bash program that can read a file, like a *.bin and print all its hexadecimal numbers, as 'hex' editors do. Where I can start?

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• image scaling with C

  - by sa125

  Hi - I'm trying to read an image file and scale it by multiplying each byte by a scale its pixel levels by some absolute factor. I'm not sure I'm doing it right, though - void scale_file(char *infile, char *outfile, float scale) { // open files for reading FILE *infile_p = fopen(infile, 'r'); FILE…

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• Displaying Image On SmallBASIC

  - by Nathan Campos

  I want to display a image using SmallBASIC. For this I've started by searching on the references, then I found a reference for IMAGE, that is like this: IMAGE #handle, index, x, y [,sx,sy [,w,h]] Then I found another to open files(OPEN): OPEN file [FOR {INPUT|OUTPUT|APPEND}] AS #fileN But I want to know…

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• Is fwrite non-blocking?

  - by John Michaels

  Before calling fflush can I consider fwrite to be = a non-blocking write? If not, why not and what are my alternatives?

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• File I/O OS handling

  - by Albinoswordfish

  This isn't a direct coding question but more of a OS handling mechanism. I was reading somebody's previous question regarding C# and file handling. Apparently C# was throwing an exception regarding a file being locked when trying to access this. So my question is, does C# use an internal lock to handle file…

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• How to check status of the serial terminal buffer from userspace in C

  - by BHARATH

  I am writing a serial communication program in userspace. I want to check how much of the buffer is full. Is there a way to do it using linux terminal i/o api? Thanks

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• 'Programming by Coincidence' Excercise: Java File Writer

  - by Tapas

  I just read the article Programming by Coincidence. At the end of the page there are excercises. A few code fragments that are cases of "programming by coincidence". But I cant figure out the error in this piece: This code comes from a general-purpose Java tracing suite. The function writes a string…

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• Reading from a file, atoi() returns zero only on first element

  - by Nazgulled

  Hi, I don't understand why atoi() is working for every entry but the first one. I have the following code to parse a simple .csv file: void ioReadSampleDataUsers(SocialNetwork *social, char *file) { FILE *fp = fopen(file, "r"); if(!fp) { perror("fopen"); exit(EXIT_FAILURE); } …

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• Javascript - why do I sometimes fail to read file content with GDownloadUrl?

  - by Daj pan spokój

  Hi everybody. I try to read some file with google's GDownloadUrl and it works only from time to time. failure means fileRows == "blah blah" success means fileRows == (real file content) I've noticed, however, that when I cease (with Firebug) the execution on line 3 for a couple of seconds, it succeeds…

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• Writing to a file in Python inserts null bytes

  - by Javier Badia

  I'm writing a todo list program. It keeps a file with a thing to do per line, and lets the user add or delete items. The problem is that for some reason, I end up with a lot of zero bytes at the start of the file, even though the item is correctly deleted. I'll show you a couple of screenshots to make…

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• read a file with both text and binary information in .Net

  - by Yin Zhu

  I need to read binary PGM image files. Its format: P5 # comments nrows ncolumns max-value binary values start at this line. (totally nrows*ncolumns bytes/unsigned char) I know how to do it in C or C++ using FILE handler by reading several lines first and read the binary block. But don't know how to…

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• What is the root directory OR how do I set the directory in DotNetZip

  - by Chris

  where does DotNetZip get it's root directory for saving. All the save examples don't show the directory. My goal is to recurse a folder and subfolders. In each folder I want to zip all the files into one zip and delete the source files. private void CopyFolder(string srcPath, string dstPath) …

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• Reading a file from a jar, or anywhere on the classpath?

  - by Stefan Kendall

  I'm trying to build an application that builds a resource file into a jar, but I'd like to have the project runnable within eclipse. I have a basic maven 2 structure for my project, and I'm unsure how to read in the file such that it's found and used when run from the JAR or from within eclipse.…

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• Prepend lines to file in Java

  - by folone

  Is there a way to prepend a line to the File in Java, without creating a temporary file, and writing the needed content to it?

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• Exception when ASP.NET attempts to delete network file.

  - by Jordan Terrell

  Greetings - I've got an ASP.NET application that is trying to delete a file on a network share. The ASP.NET application's worker process is running under a domain account (confirmed this by looking in TaskManager and by using ShowContexts2.aspx¹). I've been assured by the network admins that…

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• Modify Executing Jar file

  - by pinkynobrain

  Hello Stack Overflow friends. I have a simple problem which i fear doesnt have a simple solution and i need advice as to how to proceed. I am developing a java application packaged as and executable JAR but it requires to modify some of its JAR file contents during execution. At this stage…

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• Is it possible for competing file access to cause deadlock in Java?

  - by BlairHippo

  I'm chasing a production bug that's intermittent enough to be a real bastich to diagnose properly but frequent enough to be a legitimate nuisance for our customers. While I'm waiting for it to happen again on a machine set to spam the logfile with trace output, I'm trying to come up with a…

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• Elegant way to take basename of directory in Python?

  - by user248237

  I have several scripts that take as input a directory name, and my program creates files in those directories. Sometimes I want to take the basename of a directory given to the program and use it to make various files in the directory. For example, # directory name given by user via…

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• Using Multiple File Handles for Single File

  - by Ryan Rosario

  I have an O(n^2) operation that requires me to read line i from a file, and then compare line i to every line in the file. This repeats for all i. I wrote the following code to do this with 2 file handles, but it does not yield the result I am looking for. I imagine this is a simple…

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• Persist changes in C

  - by Mohit Deshpande

  I am developing a database-like application that stores a a structure containing: struct Dictionary { char *key; char *value; struct Dictionary *next; }; As you can see, I am using a linked list to store information. But the problem begins when the user exits out of…

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