Low-Level File I/O

Read and write operations at the byte or character level

Open, close, read, write, and navigate binary and text files at the byte and character levels. To work with files at the variable level, see Supported File Formats for Import and Export.

Functions

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Open, Close, and Read File

`fopen`	Open file or obtain information about open files
`fclose`	Close one or all open files
`fread`	Read data from binary file
`fscanf`	Read data from text file
`fgetl`	Read line from file, removing newline characters
`fgets`	Read line from file, keeping newline characters
`fileread`	Read contents of file as text
`openedFiles`	File identifiers of all open files (Since R2024a)
`ferror`	File I/O error information

Navigate File

`ftell`	Current location of file position pointer in file
`fseek`	Move file position pointer to specified position in file
`frewind`	Move file position pointer to beginning of open file
`feof`	Test for end of file

Write to File

`fwrite`	Write data to binary file
`fprintf`	Write data to text file

Topics

Import Text Data Files with Low-Level I/O
Read data from text files at the character level using low-level I/O functions.
Import Binary Data with Low-Level I/O
Read data from binary files at the byte level using low-level I/O functions.
Export to Text Data Files with Low-Level I/O
Write text files at the character level, including combinations of numeric and character data and nonrectangular files, using the low-level fprintf function.
Export Binary Data with Low-Level I/O
Write binary files at the byte level using the low-level fwrite function.