file-handling

I want to create a file descriptor in C whose value i will specify in code. I have a integer variable which specifies the value of file descriptor to be created. For example i may need a file descriptor whose value is 5 and later associate that with the file named "sample.dat" . You need dup2() http://linux.die.net/man/2/dup fd = open ("sample.dat", O_RDONLY); open the file dup2 (fd, 5); and copy the file descriptor fd into the descriptor number 5 now you can do read (5, buffer, BUFF_MAX); or also use fd to access the same file. You need to close the fd explicitly if you do not need it. As

Using FtpWebRequest to list the contents of a directory; however, it's not showing the hidden files. How do I get it to show the hidden files? FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftp_root + path); request.Method = WebRequestMethods.Ftp.ListDirectory; FileZilla lists the hidden files correctly so I know the FTP server is returning that data to it. I just need to replicate that with FtpWebRequest . Or use a different library for it. The FtpWebRequest which is provided by Microsoft does not perform all the operations neccessary for listing FTP, FTPS or SFTP site's directories

I built a Python steganographer that hides UTF-8 text in images and it works fine for it. I was wondering if I could encode complete files in images. For this, the program needs to read all kinds of files. The problem is that not all files are encoded with UTF-8 and therefore, you have to read them with: file = open('somefile.docx', encoding='utf-8', errors='surrogateescape') and if you copy it to a new file and read them then it says that the files are not decipherable. I need a way to read all kinds of files and later write them so that they still work. Do you have a way to do this in Python

I did the commands ( source ): $ exec 3>/tmp/thirdfile $ exec 4>/tmp/fourthfile $ echo drib >&3 $ echo drab >&4 $ echo another drib >&3 $ echo another drab >&4 $ exec 3>&- $ exec 4>&- How can I see the file handles, something like with lsof -l ? I don't understand, why not just use lsof: lsof -p $$ $$ being a shell variable that holds the shell's process ID You can also limit to just file descriptors like: lsof -a -d0-65535 -p $$ On Linux, you can do something like ls -l /proc/$$/fd , which will show you what file descriptors are open in your shell. Of course, substitute $$ with other numbers

I have to write multiple records in csv file. I'm using fputcsv function of php which take array as one row and write it in the file. In this way there will be multiple write operations for each row. I'm looking for a method with which I can write multiple rows in one write operation to csv file. Please help. Here's an example using the memory stream. It should give you a structure that you can customize to work through the buffer in pieces and reset progress if the buffer gets too big. <?php // Sample data $arrData = array( array("Fruit","Color","Calories"), array("Apple","Red",95), array(

In android, I am writing a file on clicking a button and on clicking next time, it saves the file and closes the buffered writer. But, I also want to implement functionality to close the buffered writer in onDestroy function. Before that I need to know if Bufferedwriter is already closed. How will I check if Buffered Writer is already closed? In addition to that, does bufferedWriter.close() function set bufferedWriter to null ? Calling close method on already closed Writer has no impact. Still, if you want to know if the Writer is closed, you can call writer.flush() , if it throws IOException