Due to operator precedence rules the condition is interpreted as fd=(fopen(fileName,”r”) == NULL). The result of == is integer, fd is a pointer, thus the error message. Consider the “extended” version of your code: FILE *fd; int ok; fd = fopen(fileName, “r”); ok = fd == NULL; // … Would you expect the last line … Read more
Java 7 introduced a much simpler way for doing zip archive manipulations – FileSystems API, which allows to access contents of a file as a file system. Besides much more straightforward API, it is doing the modification in-place and doesn’t require to rewrite other (irrelevant) files in a zip archive (as done in the accepted … Read more
os.rename(), os.replace(), or shutil.move() All employ the same syntax: import os import shutil os.rename(“path/to/current/file.foo”, “path/to/new/destination/for/file.foo”) os.replace(“path/to/current/file.foo”, “path/to/new/destination/for/file.foo”) shutil.move(“path/to/current/file.foo”, “path/to/new/destination/for/file.foo”) The filename (“file.foo”) must be included in both the source and destination arguments. If it differs between the two, the file will be renamed as well as moved. The directory within which the new file is … Read more
Misspellings are irritating, aren’t they? Check your spelling of empty, but then also try this: #!/bin/bash -e if [ -s diff.txt ]; then # The file is not-empty. rm -f empty.txt touch full.txt else # The file is empty. rm -f full.txt touch empty.txt fi I like shell scripting a lot, but one disadvantage of … Read more
Try this: require ‘open-uri’ open(‘image.png’, ‘wb’) do |file| file << open(‘http://example.com/image.png’).read end
Read all file content. Make a replacement with String.Replace. Write content back to file. string text = File.ReadAllText(“test.txt”); text = text.Replace(“some text”, “new value”); File.WriteAllText(“test.txt”, text);
Your process is the one that has the file open (via im still existing). You need to close it first before deleting it. I don’t know if PIL supports with contexts, but if it did: import os from PIL import Image while True: img_dir = r”C:\Users\Harold\Google Drive\wallpapers” for filename in os.listdir(img_dir): filepath = os.path.join(img_dir, filename) … Read more
In order to omit the byte order mark (BOM), your stream must use an instance of UTF8Encoding other than System.Text.Encoding.UTF8 (which is configured to generate a BOM). There are two easy ways to do this: 1. Explicitly specifying a suitable encoding: Call the UTF8Encoding constructor with False for the encoderShouldEmitUTF8Identifier parameter. Pass the UTF8Encoding instance … Read more
You can use std::getline : #include <fstream> #include <string> int main() { std::ifstream file(“Read.txt”); std::string str; while (std::getline(file, str)) { // Process str } } Also note that it’s better you just construct the file stream with the file names in it’s constructor rather than explicitly opening (same goes for closing, just let the destructor … Read more
The assignment operator in Java evaluates to the assigned value (like it does in, e.g., c). So here, readLine() will be executed, and its return value stored in line. That stored value is then checked against null, and if it’s null then the loop will terminate.