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Please note that the recommended version of Scilab is 2024.0.0. This page might be outdated.
See the recommended documentation of this function
opens a file in Scilab
[fd, err] = mopen(file [, mode, swap ])
a character string. The pathname of the file to open.
a character string that controls whether the file is opened for reading (
r), writing (
w), or appending (
a) and whether the file is opened for updating (
modecan also include a
bparameter to indicate a binary file.
The default value is
a scalar. If
swapis present and
swap = 0then automatic bytes swap is disabled.
The default value is 1.
a scalar. Error indicator.
error value: error message: 0 No error -1 no more logical units -2 cannot open file -3 no more memory -4 invalid name -5 invalid status
a scalar: a file descriptor (it's a positive integer).
mopen may be used to open a
file in a way
compatible with the C
fopen procedure. Without
swap argument the
file is supposed to be coded in "little endian IEEE
format" and data are swaped if necessary to match the IEEE format of
mode parameter controls the access allowed to
the stream. The parameter can have one of the following values. In this
list of values, the
b character indicates a binary
opens the file for reading.
opens a binary file for reading.
opens a text file for reading.
creates a new file for writing, or opens and truncates a file to zero length.
creates a new binary file for writing, or opens and truncates a file to zero length.
creates a text binary file for writing, or opens and truncates a file to zero length.
- a or ab
appends (opens a file for writing at the end of the file, or creates a file for writing).
- r+ or r+b
opens a file for update (reading and writing).
- w+ or w+b
truncates to zero length or creates a file for update.
- a+ or a+b
appends (opens a file for update, writing at the end of the file, or creates a file for writing).
When you open a file for update, you can perform both input and output
operations on the resulting stream. However, an output operation cannot
be directly followed by an input operation without a file-positioning
mseek function). Also, an input
operation cannot be directly followed by an output operation without an
intervening file positioning operation, unless the input operation
encounters the end of the file.
When you open a file for append (that is, when the
mode parameter is
a+), it is impossible to overwrite information
already in the file. You can use the
function to reposition the file pointer to any position in the file,
but when output is written to the file, the current file pointer is
ignored. All output is written at the end of the file and the file
pointer is repositioned to the end of the output.
To open files in a way compatible with Fortran-like functions use function
// open a SCI+'/ACKNOWLEDGEMENTS' as text and read only fd_r = mopen(SCI+'/ACKNOWLEDGEMENTS', 'rt') // read five lines of fd_r mgetl(fd_r, 5) // another way to read file // here read five words mfscanf(5, fd_r, '%s') // close file descriptor associated to SCI+'/ACKNOWLEDGEMENTS' as text and read only mclose(fd_r);
// read/write a file as binary // first we write file fd_wb = mopen(TMPDIR+'/writeread.bin', 'wb') // put values as binary mput(2003, 'l', fd_wb); mput(2008, 'i', fd_wb); mput(2012, 's', fd_wb); mput(98, 'c', fd_wb); // close file descriptor associated to TMPDIR+'/writeread.bin' mclose(fd_wb); // we read file fd_rb = mopen(TMPDIR+'/writeread.bin', 'rb') mget(fd_rb, 'l') mget(fd_rb, 'i') mget(fd_rb, 's') mget(fd_rb, 'c') mclose(fd_rb)
- file — file management
- mclose — closes an opened file
- merror — tests the file access errors indicator
- meof — checks if end of file has been reached
- mfprintf — converts, formats, and writes data to a file
- fprintfMat — writes a matrix in a file
- mfscanf — reads input from the stream pointer stream (interface to the C fscanf function)
- fscanfMat — reads a matrix from a text file
- mget — reads byte or word in a given binary format and converts to a double type
- mgetl — reads lines from an text file
- mgetstr — reads a character string from a file
- mprintf — converts, formats, and writes data to the main scilab window
- mput — writes byte or word in a given binary format
- mputl — writes strings in a text file
- mputstr — writes a character string in a file
- mseek — sets current position in a binary file
- mtell — binary file management
- mdelete — deletes file(s)
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