How can I pass an array of record as a parameter?

Posted on 2014-09-17
Last Modified: 2014-09-22
Hello Guys

Let me give an example where I am stuck.

I have 3 units, A, B, and C

My unit B is a unit only for records and numerate variables.

My Unit B is declared in both units, A and C and it has a record

this way:

TCadPal = record
   id : integer;
  word: string;
  sentence : string;

My unit A has a variable like this:

EstPal : Array of TCadPal;

The Unit C  is a unit only for functions and procedures that can be called / used
from many units of my system. The unit C is a libry function.

I need to develop a function in unit C that could fulfill my array varriable, something like this:

Function FulfillVariableCadPal(MyVar: xxxxxxxx)
  i : Integer
  For i := 0 to 5
     SetLength(Myvar, Length(MyVar)+1);
    MyVar[i].id := xxxx
    MyVar[i].word := xxxx
    MyVar[i].sentence := xxxx

   and so on 


Open in new window

My problem is that I don't know how to, I tried to create  (MyVar: Array of TCadPal;) but the compiler told me

 ULibSQL.pas(6481): E2008 Incompatible types

This error points to this line      SetLength(Myvar, Length(MyVar)+1);

I thanks in advance the help
Question by:hidrau
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LVL 33

Expert Comment

ID: 40328072
Please post a concise and complete example. It may a namespace (unit name) problem..

Author Comment

ID: 40328181

Well, what I need is only to pass my array of record to my function where it can populate it.

The problem is that I can use this line

SetLength(Myvar, Length(MyVar)+1);

I think the way I am declaring the parameter is wrong but I don't know to the correct way

this is my problem, it is simple but I didn't find the correct way. My array of record will increase dynamically.
LVL 19

Expert Comment

ID: 40328195
can you please make three units, A, B and C containing the _minimum_ amount of code required to show the problem and post them here?
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LVL 100

Accepted Solution

mlmcc earned 250 total points
ID: 40328337
You need to declare the array as a type so you can pass the TYPE into the procedure.

When you declare them in the procedure header you are actually creating an unnamed type  So you now essentially have UnamedType1 - in the procedure header and UnamedType2 in the other declaration. The types don't match to the compiler even though to you they do match.

You will have to add the type to a class and include the class in the library unit.

LVL 27

Assisted Solution

by:Sinisa Vuk
Sinisa Vuk earned 250 total points
ID: 40329300
mlmcc is right. you definition in B should be (array type):
TCadPal = record
   id : integer;
  word: string;
  sentence : string;
TCadPalArray = array of TCadPal;

Open in new window

..usage in C:
Function FulfillVariableCadPal(var MyVar: TCadPalArray): Boolean;
   i : Integer;
  SetLength(MyVar, 6);
  for i := Low(MyVar) to High(MyVar) do
    MyVar[i].id := xxxx
    MyVar[i].word := xxxx
    MyVar[i].sentence := xxxx

Open in new window


Author Closing Comment

ID: 40338197
thanks very much

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