With Rust being comparatively new, I’ve seen far too many ways of reading and writing files. Many are extremely messy snippets someone came up with for their blog, and 99% of the examples I’ve found (even on Stack Overflow) are from unstable builds that no longer work. Now that Rust is stable, what is a … Read more
I’m working on a program that will be processing files that could potentially be 100GB or more in size. The files contain sets of variable length records. I’ve got a first implementation up and running and am now looking towards improving performance, particularly at doing I/O more efficiently since the input file gets scanned many … Read more
I have a long list of lists of the following form — a = [[1.2,’abc’,3],[1.2,’werew’,4],……..,[1.4,’qew’,2]] i.e. the values in the list are of different types — float,int, strings.How do I write it into a csv file so that my output csv file looks like 1.2,abc,3 1.2,werew,4 . . . 1.4,qew,2 12 Answers 12
What’s the best way to create a temporary file in Android? Can File.createTempFile be used? The documentation is very vague about it. In particular, it’s not clear when temporary files created with File.createTempFile are deleted, if ever. 6 Answers 6
I have a piece of code here that breaks if the directory doesn’t exist: System.IO.File.WriteAllText(filePath, content); In one line (or a few lines), is it possible to check if the directory leading to the new file doesn’t exist and if not, to create it before creating the new file? I’m using .NET 3.5. 6 Answers … Read more
For new applications written in Java 7, is there any reason to use a java.io.File object any more or can we consider it deprecated? I believe a java.nio.file.Path can do everything a java.io.File can do and more. 8 Answers 8
I’m loading a text file from within a package in a compiled JAR of my Java project. The relevant directory structure is as follows: /src/initialization/Lifepaths.txt My code loads a file by calling Class::getResourceAsStream to return a InputStream. public class Lifepaths { public static void execute() { System.out.println(Lifepaths.class.getClass(). getResourceAsStream(“/initialization/Lifepaths.txt”)); } private Lifepaths() {} //This is temporary; … Read more
How do I read a file into a std::string, i.e., read the whole file at once? Text or binary mode should be specified by the caller. The solution should be standard-compliant, portable and efficient. It should not needlessly copy the string’s data, and it should avoid reallocations of memory while reading the string. One way … Read more
I wrote this function to read a line from a file: const char *readLine(FILE *file) { if (file == NULL) { printf(“Error: file pointer is null.”); exit(1); } int maximumLineLength = 128; char *lineBuffer = (char *)malloc(sizeof(char) * maximumLineLength); if (lineBuffer == NULL) { printf(“Error allocating memory for line buffer.”); exit(1); } char ch = … Read more
What is the quickest way to read a text file into a string variable? I understand it can be done in several ways, such as read individual bytes and then convert those to string. I was looking for a method with minimal coding. 15 Answers 15
