Difference between revisions of "Openfile"
From OpenEUO
(Created page with " io.open (filename [, mode]) This function opens a file, in the mode specified in the string mode. It returns a new file handle, or, in case of errors, nil plus an error message...") |
(No difference)
|
Revision as of 20:22, 7 October 2010
io.open (filename [, mode])
This function opens a file, in the mode specified in the string mode. It returns a new file handle, or, in case of errors, nil plus an error message.
The mode string can be any of the following:
- "r": read mode (the default);
- "w": write mode;
- "a": append mode;
- "r+": update mode, all previous data is preserved;
- "w+": update mode, all previous data is erased;
- "a+": append update mode, previous data is preserved, writing is only allowed at the end of file.
- "b": the mode string can also have a 'b' at the end, which is needed to open the file in binary mode.
This string is exactly what is used in the standard C function fopen.
