How to append text to an existing file in Java
I need to append text repeatedly to an existing file in Java. How do I do that? ...
io
Are there good examples of good C++ I/O usage.
I am heavily involved in doing I/O in C++ (currently using it for printing headers, tables, some data alignments), and wonder about it proper/great usage in either open source projects or general examples/nippets I use things such: cout.setf(ios::right,ios::jyustified); cout<<std::setw() std::copy (vector.begin(), vector.end(), std::o...
Example of CPU and I/O burst cycle?
Can somebody give me an example of CPU and I/O burst cycle? I know the CPU must do its calculation during the burst, but how about the I/O? What actually happens during the I/O time? ...
Restricting file/folder write to paths other then the specified root
In .NET is there any API that allows me to restrict some IO operations to the specified path? For example: Root Path: C:\Test\ Now I want to call a function like this: IO.Directory.CreateDirectory("../testing/",Root) And now I want the API to handle this situation for me and do not create a folder other than the specified direct...
XOR on a very big file
I would like to XOR a very big file (~50 Go). More precisely, I would like to do so by XORing each block of 32 bytes of a plaintext file (because of lack of memory) with the key 3847611839 and create (block after block) a new cipher file. Thank You for any help!! ...
Too many open file handles
I'm working on a huge legacy Java application, with a lot of handwritten stuff, which nowadays you'd let a framework handle. The problem I'm facing right now is that we are running out of file handles on our Solaris Server. I'd like to know what's the best way to track open file handles? Where to look at and what can cause open file ha...
Is there a way to drive a today's computer NIC with no underlying OS?
Hi, I would like to write an IO intensive application with no underlying OS, running on x86 architecture and driving any modern network interface controller. By having a look to Linux's drivers source code, I know that thousands lines of codes are required to drive, as an example, an Intel e1000e Gigabit controller. I think that such c...
A Haskell function of type: IO String-> String
I wrote a bunch of code in Haskell to create an index of a text. The top function looks like this: index :: String -> [(String, [Integer])] index a = [...] Now I want to give this function a String read from a file: index readFile "input.txt" Which won't work because readFile is of type FilePath -> IO String. Couldn't match exp...
Java: interspersing bytes and characters
I have a piece of test equipment, from which I can read data using an InputStream, which intersperses bytes and characters (organized into lines), e.g.: TEST1 TEST2 500 {500 binary bytes follows here} TEST3 TEST4 600 {600 binary bytes follows here} I'd like to use BufferedReader so I can read a line at a time, but then switch to Input...
PDf to String in Java
What is the easiest way to get the text (words) or a PDF doc as a one long String or array of Strings. I have tried pdfbox but that is not working for me. ...
System.IO exception?
I have Winforms insight have one picture box. When I double click, my logic writes (using stream class) a picture and then stores one in the system folder. When I am trying to write, I get an error like "can't access file; it's being processed by another process". How can I overcome this problem? ...
java read file from network device
can someone help me to find a tutorial or sample java code for reading file from a any machine which is same network ...
Will data in a pipe queue up for reading by Perl?
I have a Perl script that executes a long running process and observes its command line output (log messages), some of which are multiple lines long. Once it has a full log message, it sends it off to be processed and grabs the next log message. open(PS_F, "run.bat |") or die $!; $logMessage = ""; while (<PS_F>) { $lineRead = $_; ...
java - effective files copying
hi. i would like to know which is the best way to copy large number of files. ...
Removing pause after reading using readLine in java
I am reading several lines from the console in a java program using the readLine command from the BufferedReader class. However, the program pauses at the end of the last line and does not proceed until i press return. How do I eliminate this pause? ...
Is File.Exists an expensive operation?
Re: http://msdn.microsoft.com/en-us/library/system.io.file.exists.aspx Does anyone know if this is a particularly slow or locking operation which could impact server performance in a large environment? Thanks, Matt. ...
Output results of a task in a FOR loop with added variables for logging
G'day all, Trying to output the results of the task I'm running in a FOR loop with additional data. In this case, I'm using the FOR loop to read in server names from a text file to setup a scheduled job. I would like to capture the results on each loop and output to a log file but need to insert additional information such as server nam...
Flush stdout in DrScheme?
I can do it in Java, Python, Haskell... how do you do it in DrScheme? A customary google search didn't yield the answer. ...
File I/O In DrScheme
(read) takes in a string from stdin, parses it as an s-expression, and returns that expression. How do I do the exact same thing, except taking input from a file? ...
How can I rename a file in Java?
My purpose is to rename one file. What I'm doing is: I'm searching a particular string in a text file. Among So many files and if that particular text is found then I want rename that text file with a given string. Here is what I have tried: String opcode="OPCODES"; // String that I want to search. File file = new File("D:\\C...