tuple_chrt — Convert a tuple of integer numbers into strings.
tuple_chrt converts the input tuple
T, consisting of integer
numbers, into a tuple of strings and integer numbers (where only the number 0
is passed as number to the output).
All other numbers are converted to characters that are concatenated to one
string up to the next 0 in the input tuple.
When the encoding used in the HALCON library is UTF-8 (see
set_system('filename_encoding', 'utf8')) and the string operators
are set to work by code points (see
set_system('tuple_string_operator_mode', 'codepoint')), which is the
default for both, the operator interprets the input numbers as Unicode
character codes and transforms them to the appropriate UTF-8 representations
of the characters.
When the HALCON library encoding is set to 'locale' or the string
operator mode is 'byte', the operator accepts only numbers between
0 and 256.
In that case they are interpreted as ANSI codes from which the output string
has to be built byte by byte.
In that mode it is not checked whether the byte sequences will build valid
characters according to the current string encoding.
See also Tuple / String Operations for a more detailed description
of the different modes and further encoding issues.
The operator tries to pack as many input numbers into one string as possible.
If the number 0 occurs in the input tuple
T, the current string is
terminated and the number 0 is added to the output tuple.
If in the input tuple more numbers follow, a new string is started.
This operator can be used to convert data read with
This approach allows also to read bytes with the value 0.
If the input tuple is empty, the operator returns an empty tuple.
HDevelop provides an in-line operation for
which can be used in an expression in the following syntax:
Chrt := chrt(T)
Input tuple with integer numbers.
0 <= T
→(string / integer)
Output tuple with strings that are separated by the number 0.
read_serial (SerialHandle, 100, Data) tuple_chrt (Data, Strings)