file-io

问题 My C# is a bit rusty and I've never written XML with it before. I'm having trouble getting the XML to write to a file if I attempt to write anything other than elements. Here is the test code that I have: var guiPath = txtGuiPath.Text; MessageBox.Show("Dumping File: " + guiPath); try { var writer = new XmlTextWriter("client_settings.xml", null); writer.WriteStartDocument(); writer.WriteComment("Config generated on 01/01/01"); writer.WriteStartElement("Config"); writer.WriteStartElement(

问题 I have a file called test which has the contents: a b c d e f g I am using the following python code to read this file line by line and print it out: with open('test.txt') as x: for line in x: print(x.read()) The result of this is to print out the contents of the text file except for the first line, i.e. the result is: b c d e f g Does anyone have any idea why it might be missing the first line of the file? 回答1: Because for line in x iterates through every line. with open('test.txt') as x:

问题 I have a file called test which has the contents: a b c d e f g I am using the following python code to read this file line by line and print it out: with open('test.txt') as x: for line in x: print(x.read()) The result of this is to print out the contents of the text file except for the first line, i.e. the result is: b c d e f g Does anyone have any idea why it might be missing the first line of the file? 回答1: Because for line in x iterates through every line. with open('test.txt') as x:

问题 I have a file with data something like this - Name, Age, Occupation John, 14, Student George, 14, Student William, 23, Programmer Now, I want to read the data such that each value (e.g. Name, Age etc.) are read as a string. This is my code snippet - .... if (!(ferror(input_fp) || ferror(output_fp))) { while(fscanf(input_fp, "%30[^ ,\n\t]%30[^ ,\n\t]%30[^ ,\n\t]", name, age_array, occupation) != EOF){ fprintf(stdout, "%-30s%-30s%-30s\n", name, age_array, occupation); } fclose(input_fp); fclose

问题 I am writing a Java servlet, using Tomcat as the container, which creates and serves PDF files to the end-user. Currently the PDF files are created in-memory and written out as a response to a POST. I would like to change this up somewhat so that the PDF files are written to disk (so they can be served up again later). I am having trouble locating a suitable "how-to" for doing this. How can I configure my servlet to write to and read files from a directory server-side? From what I've read, I

问题 I am writing a Java servlet, using Tomcat as the container, which creates and serves PDF files to the end-user. Currently the PDF files are created in-memory and written out as a response to a POST. I would like to change this up somewhat so that the PDF files are written to disk (so they can be served up again later). I am having trouble locating a suitable "how-to" for doing this. How can I configure my servlet to write to and read files from a directory server-side? From what I've read, I

问题 I need to understand the difference between these two classes and how they work with each other. I understand that FileReader reads characters from a file one character at a time and the BufferedReader reads a large chunk of data and stores it in a buffer and thus makes it faster. In order to use a BufferedReader, i have to provide it a FileReader. How does the BufferedReader class use the FileReader if it reads the file differently? Does it mean that BufferedReader uses FileReader and

问题 I'm trying to illustrate the difference in performance between traditional IO and memory mapped files in java to students. I found an example somewhere on internet but not everything is clear to me, I don't even think all steps are nececery. I read a lot about it here and there but I'm not convinced about a correct implementation of neither of them. The code I try to understand is: public class FileCopy{ public static void main(String args[]){ if (args.length < 1){ System.out.println(" Wrong

问题 I am trying to pretty print a hash to a file. I tried unix redirects [added different flags to it incrementally] : `echo #{pp mymap} | tee summary.out 2>&1` and File IO my_file = File.new(@dir_+"/myfile.out",'w+') my_file.puts `#{pp get_submap_from_final(all_mapping_file,final_map)}` It always prints to console and doesnt write to a file. Also there has to be an easier way to write to file in one line in ruby ? instead of doing File.new and then writing to a file ? 回答1: require 'pp' File.open

问题 I am trying to pretty print a hash to a file. I tried unix redirects [added different flags to it incrementally] : `echo #{pp mymap} | tee summary.out 2>&1` and File IO my_file = File.new(@dir_+"/myfile.out",'w+') my_file.puts `#{pp get_submap_from_final(all_mapping_file,final_map)}` It always prints to console and doesnt write to a file. Also there has to be an easier way to write to file in one line in ruby ? instead of doing File.new and then writing to a file ? 回答1: require 'pp' File.open