merror

Arguments

fd

a scalar: the fd parameter returned by the function mopen is used as a file descriptor (it's a positive integer). -1 stands for last opened file. The default value is -1.

err

a scalar: an error status number of the most recent file I/O operation associated with the specified file.

If the most recent I/O operation performed on the specified file was successful, the value of msg is empty and merror returns an err value of 0.

msg

a string: an error string message.

Description

The function merror is used to test the file access errors indicator returning non-zero if it is set. The error indicator can only be reset by the mclearerr function.

A nonzero err indicates that an error occurred in the most recent file I/O operation. The value of message is a string that can contain information about the nature of the error. If the message is not helpful, consult the C run-time library manual for your host operating system for further details.

Examples

fd = mopen(TMPDIR +'/filetxt.txt','wt');
[err,msg] = merror(fd)
if (err <> 0) then
  mprintf('Problem\n');
end
mclose(fd);

See also

• mclearerr — resets binary file access errors
• mclose — closes an opened file
• mopen — opens a file in Scilab
• mput — writes byte or word in a given binary format
• mget — reads byte or word in a given binary format and converts to a double type
• mgetstr — reads a character string from a file
• mputstr — writes a character string in a file
• meof — checks if end of file has been reached
• mseek — sets current position in a binary file
• mtell — Returns the offset of the current byte relative to the beginning of a file