How to concatenate strings in new Delphi (old way no longer works) E2008 Incompatible types

[cupboy2013]

Any explanation of why these lines of code are bad? Is something totally different about strings in the new Delphi as compared to Delphi 7?

{ lbx.Items.Add(Dest + '[' + Dest2 + ']'); }
{ TODO: So plus signs are illegal now? How do you concatenate strings?}
lbx.Items.Add(Concat(Dest,'[',Dest2,']')); // this doesn't work either

Here's how the two variables are defined:
Dest: array[0..254] of char;
Dest2: array[0..254] of char;

 

[sggaunt]

Totally different, in some ways yes. Its the ANSI char thing I guess.



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[majlumbo]

You can convert each array to a string, then concatenate them

function CharArrayToString(const Ch: Array of Char): String
begin
   Result := '';
   if Length(Ch) > 0 then
      SetString(Result, PChar(@Ch[0]), Length(Ch));
end;

lbx.items.add(CharArrayToString(Dest)+'['+CharArrayToString(Dest2)+']');

 

[imex]

cupboy2013, you can make a Cast to String before concatenate:

lbx.Items.Add(string(Dest) + '[' + string(Dest2) + ']');

Hope this helps.

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[Prattaratt]

Why are you using char arrays instead of the default string type? The listbox.items will accept them, and concatenation should be availble with + operator.

 

[cupboy2013]

This was a Delphi 7 program. Maybe char arrays were the only way it worked back then. Not quite sure. Anyone know?

 

[cupboy2013]

Now I know why. It's because the char arrays are needed to call the Windows API functions this program uses.

 

[cupboy2013]

This is the solution:

lbx.Items.Add(StrPas(Dest) + '[' + StrPas(Dest2) + ']');