Campbell-scientific CR800 and CR850 Measurement and Control Systems Instrukcja Użytkownika Pobierz pdf (Strona 239)

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Section 7. Installation

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7.8.13.2 String Concatenation

Concatenation is the building of strings from other strings ("abc123"), characters

("a" or chr()), numbers, or variables.

Table 39. String Concatenation Examples

Expression Comments Result

Str(1) = 5.4 + 3 + " Volts"

Add floats, concatenate strings

"8.4 Volts"

Str(2) = 5.4 & 3 & " Volts"

Concatenate floats and strings

"5.43 Volts"

Lng(1) = "123"

Convert string to long

123

Lng(2) = 1+2+"3"

Add floats to string / convert to long

Lng(3) = "1"+2+3

Concatenate string and floats

123

Lng(4) = 1&2&"3"

Concatenate floats and string

123



7.8.13.3 String NULL Character

All strings are automatically NULL terminated. NULL, Chr(0) or "", counts as

one of the characters in the string. Assignment of just one character is that

character followed by a NULL, unless the character is a NULL.

Table 40. String NULL Character Examples

Expression Comments Result

LongVar(5) = "#"-""

Subtract NULL, ASCII code results

LongVar(6) = StrComp("#","")

Also subtracts NULL

Example:

Objective:

InsertaNULLcharacterintoastring,andthenreconstitutethestring.

Given:

StringVar(3) = "123456789"

Execute:

StringVar(3,1,4) = "" "123<NULL>56789"

Results:

StringVar(4) = StringVar(3) "123"

But,

StringVar(3) still = "123<NULL>56789",

so,

StringVar(5) = StringVar(3,1,4+1)

'"56789"

StringVar(6) = StringVar(3) + 4 + StringVar(3,1,4+1)

'"123456789"

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