LUA Reference Guide
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io.read()
The io.read() function is used to read data from the file on SD card.
Notice: other read commands (like "all", etc..) are *not supported.

Parameters

  • file object a file object that was returned by the io.open() function. The file must be opened in read mode.
  • length number of characters/bytes to read. The number of actual read/returned characters can be less if the file end is reached.

Return value

  • <string> a string with a length equal or less than
  • "" a zero length string if the end of file was reached
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