C file handling fseek

Data is added to the end of the file. If is opened successfully fopen loads it into memory and sets up a pointer which points to the first character in it.

Returns NULL, if unable to open the file. If the file is opened successfully fopen loads it into memory and sets up a pointer which points to the last character in it. For performing the operations on the file, a special pointer called File pointer is used which is declared as. Skip to content. Change Language. Related Articles. Table of Contents. Improve Article. Save Article. Like Article. Take a step-up from those "Hello World" programs.

C provides inbuilt library functions that are ready to use by importing the library in the program and following their syntax accordingly. Once the file pointer is moved to a specified offset, we can perform any operation like writing, reading from the file according to the programmer requirements. So fseek is used with its all 3 arguments along with the other file functions to perform their respective tasks.

It is basically a C function used for handling the file operations. By using the fseek function in C, the desired read and write operations can be performed by locating the file pointer and moving it accordingly.

First, we are including the stdio. First, the file is opened using the fopen function and the file pointer is returned by it. Now the fseek function is used to move the file pointer to the end of the file. In order to isert the data in the file, fputs function is used with the string which needs to be inserted. Now the fseek function is used in order to move the file pointer 12 characters ahead in the file.

This is not really reading a file, it reading an ITEM. A file contains items. So a Directory is more appropriately called a file and all items with in it, including other Directories are Items. I worked on the Pick System. To access the file you would Open filename to filenamevariable. Create the file. If gcc lib is used then fread returns the block count not the number of bytes read.

This also means that if EOF is reached that the partial block is dropped, not returned. I want you to show me the codes to display the bellow output form of rectangle using stars in c file :. I come from a background in the Pick OS where we do a READ and get the whole item which is delineated by attribute marks char , value marks char and sub-value marks char Just curious. Marshall, I have no idea how the Pick system is implemented. I worked at Pick Systems for years as a tech support person.

I often worked with the programmers but never actually asked how the system was implemented. If I am wrong, please correct me. I want to increment the content of one file by one whenever that file opens, I. Save my name, email, and website in this browser for the next time I comment. Notify me of followup comments via e-mail. Previous post: wget vs curl: How to Download Files Using wget and curl. All rights reserved Terms of Service.

As with any OS, file handling is a core concept in Linux. The stream is positioned at the beginning of the file. The file is created if it does not exist, otherwise it is truncated.

The file is created if it does not exist. The stream is positioned at the end of the file.