Option Value Size

Member size specifies the size of the option value (in bytes). This member has a slightly different interpretation depending on the type of the option value:

SANE_TYPE_STRING:

The size is the maximum size of the string. For the purpose of string size calcuations, the terminating NUL character is considered to be part of the string. Note that the terminating NUL character must always be present in string option values.

SANE_TYPE_INT, SANE_TYPE_FIXED:

The size must be a positive integer multiple of the size of a SANE_Word. The option value is a vector of length

$${\tt size}/{\tt sizeof(SANE\_Word)}.$$

SANE_TYPE_BOOL:

The size must be set to sizeof(SANE_Word).

SANE_TYPE_BUTTON, SANE_TYPE_GROUP:

The option size is ignored.