The ReadCharacter(file) command reads a single character from file.  The character is returned as a string of length $1$.

If file is the name of a file that has not been opened, Maple attempts to open the file before reading the character.

An error is raised if file is not a valid descriptor or if it is the name of a file that does not exists.

If the end of the file has been reached, ReadCharacter returns NULL.

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{WriteString}\right]\left(''file''\,''123''\right)$

$3$

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{Close}\right]\left(''file''\right)\:$

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{ReadCharacter}\right]\left(''file''\right)$

$''1''$

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{ReadCharacter}\right]\left(''file''\right)$

$''2''$

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{ReadCharacter}\right]\left(''file''\right)$

$''3''$

$\mathrm{FileTools}\left[\mathrm{Text}\right]\left[\mathrm{ReadCharacter}\right]\left(''file''\right)$