compile, function pos: wrong number of arguments
lazarus / 21-General

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Matze · 2025-01-31 11:21

Hello,
when i try to compile my code i get an error at function pos:

Project compile, choice.exe: Exit code 1, Error: 50
choice.lpr(354,55) Error: Wrong number of parameters specified for
call to "Pos"
Error: Found declaration: Pos(const ShortString;const
ShortString):LongInt;
Error: Found declaration: Pos(Char;const ShortString):LongInt;
Error: Found declaration: Pos(const ShortString;const
RawByteString):LongInt;
...

my source code is:
if ((copy(Upcase(Parameter), 1, 2) = '/T') and (Pos('/D',
Upcase(CMDzeile), 1) < 1)) or
         (copy(Upcase(Parameter), 1, 2) = '/D') then
        begin
        ...

I have 3 arguments for pos, but the error solution only requires 2
arguments?

In the FPC compiler I can use 3 arguments.

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Lazarus 1.8.2
FPC 3.0.4

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cdbc · 2025-01-31 11:37

Hi
QuoteIn the FPC compiler I can use 3 arguments.The third param is
default to 1, just leave it out, i.e.: 2 params only!
Otherwise, I think you have to include 'StrUtils' in your uses
clause...
Regards Benny

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MarkMLl · 2025-01-31 11:41

The way to tackle something like that is to break your expression out
into multiple lines and count parentheses carefully:


(

(copy(Upcase(Parameter), 1, 2) = '/T') and

(Pos('/D', Upcase(CMDzeile), 1) < 1)

) or
         (copy(Upcase(Parameter), 1, 2) = '/D'
)


Hence it appears that you might have a misplaced one before the or
operator.

Please use code tags for examples, if it had contained any square
brackets it would have been mnagled. Please put your software versions
in the body of the posting rather than in your sig, since it you ever
update your sig all messages you've every posted will appear with the
new one losing the context of each question.

MarkMLl

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PascalDragon · 2025-02-02 20:26

Quote from: Matze on January 31, 2025, 12:21:41 pmLazarus 1.8.2
FPC 3.0.4

The 3-argument variant of Pos is only available from FPC 3.2 on. But
as your call to Pos has that argument set to 1 you can simply remove
that.