file-io

问题 I'm trying to store strings directly into a file to be read later in C++ (basically for the full scope I'm trying to store an object array with string variables in a file, and those string variables will be read through something like object[0].string). However, everytime I try to read the string variables the system gives me a jumbled up error. The following codes are a basic part of what I'm trying. #include <iostream> #include <fstream> using namespace std; /* //this is run first to create

问题 I came across this and this questions on deleting opened files in linux However, I'm still confused what happened in the RAM when a process(call it A ) deletes an opened file by another process B . What baffles me is this(my analysis could be wrong, please correct me if so): When a process opens a file, a new entry for that file in the UFDT is created. When a process deletes a file, all the links to the file are gone especially, we have no reference to its inode , thus, it gets removed from

问题 I came across this and this questions on deleting opened files in linux However, I'm still confused what happened in the RAM when a process(call it A ) deletes an opened file by another process B . What baffles me is this(my analysis could be wrong, please correct me if so): When a process opens a file, a new entry for that file in the UFDT is created. When a process deletes a file, all the links to the file are gone especially, we have no reference to its inode , thus, it gets removed from

问题 This question already has answers here : Is there a way to check if a file is in use? (19 answers) Closed 4 years ago . Many a times we get an error, while trying to write file on Windows platform, "The process cannot access the file 'XXX' because it is being used by another process." How to check in C#, before writing to file that its not being used by another process? 回答1: You can't, basically - you have to attempt to open the file for writing, and if you get an exception you can't write to

问题 I'm sure this is a simple problem, but I haven't been able to find an obvious solution. I have a series of model output array files (dim 180, 360, 12) generated in matlab that I need to open in R. I have attempted to use the R.matlab package, simply using the readMat command, and this results in a list object. Attempting to write this list into a matrix results in a memory allocation error. I have tried unlisting, but that did not help either. How can I open these matlab matrix files and

问题 I'm sure this is a simple problem, but I haven't been able to find an obvious solution. I have a series of model output array files (dim 180, 360, 12) generated in matlab that I need to open in R. I have attempted to use the R.matlab package, simply using the readMat command, and this results in a list object. Attempting to write this list into a matrix results in a memory allocation error. I have tried unlisting, but that did not help either. How can I open these matlab matrix files and

问题 This question already has answers here : How to append text to an existing file in Java? (31 answers) Closed 3 years ago . I have one project that I want to get input from jframe. I have to input 3 people data in only one time when code was running and write that data into file name person.txt.Those data have Name Nickname Age and when i compile my code, It dosn't work and I just only write one data in person.txt file. Help me please? I can't get those in my project. what should i do ? public

问题 I wrote a simple check_file_ref function using WinAPI to check whether two paths reference the same file. The code is fine. It's compiled with Visual Studio 2017 in C (flag /TC ). The weird thing is CreateFileA (winapi) always fails when the executable is run under Visual Studio (ie execute without debugging), returning an invalid file handle. Otherwise, it works as expected when the executable is run outside of Visual Studio. The working dir is the same in any case. main.c: #include <stdio.h

问题 I wrote a simple check_file_ref function using WinAPI to check whether two paths reference the same file. The code is fine. It's compiled with Visual Studio 2017 in C (flag /TC ). The weird thing is CreateFileA (winapi) always fails when the executable is run under Visual Studio (ie execute without debugging), returning an invalid file handle. Otherwise, it works as expected when the executable is run outside of Visual Studio. The working dir is the same in any case. main.c: #include <stdio.h

问题 I have a bunch of questions in file handling in Python. Please help me sort them out. Suppose I create a file something like this. >>>f = open("text,txt", "w+") >>>f.tell() >>>0 f is a file object. Can I assume it to be a file pointer? If so what is f pointing to ? The empty space reserved for first byte in file structure? Can I assume file structure to be zero indexed? In microprocessors what I learnt is that the pointer always points to the next instruction. How is it in python? If I write