On 29/10/17 00:31, Vojtěch Čihák wrote:
Looking to docs: https://www.freepascal.org/docs-html/ref/refsu69.html
I tried writeln(AnsiString(args[0].VAnsiString));
or just writeln(String(args[0].VAnsiString));
which works.
V.
______________________________________________________________
> Od: Darius Blaszyk <dhkblas...@zeelandnet.nl>
> Komu: FPC-Pascal users discussions <fpc-pascal@lists.freepascal.org>
> Datum: 29.10.2017 00:59
> Předmět: [fpc-pascal] Problem with array of const
>
Consider the application below. When I run it I do get the following output:
name
rg��������name�F&{00000000-0000-0000-C000-000000000046}
In other words I lose the first character (a) from the arguments
supplied and the string returns with a lot of garbage. What am I doing
wrong here?
Rgds, Darius
program test_args;
procedure test(name: string; args: array of const);
begin
writeln(name);
writeln(args[0].VString^);
end;
begin
test('name', ['arg']);
end.
----------
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vtString : (VString: PShortString);
in short the compiler is sending AnsiString and you are then telling
it to interpret this as a traditional pascal string of length 97. The
Tvarrec in the Array of const effectively removes the usual strong type
checking you get with Pascal.
string literals now get compiled as AnsiString unless you explicitly
assign them to a typed constant:
program test_args;
{$mode objfpc}
procedure test(name: string; args: array of const);
begin
writeln(name);
writeln(args[0].VString^);
end;
const sh:shortstring='sconst';
var s:shortstring='arg';
begin
test('name', [s]);
test('name', [sh]);
end.
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