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Format of a DLL (internal functions)

Posted on 2007-03-24
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Last Modified: 2010-04-05
I'm rather lost in my first attempt to create a Delphi 5 DLL.

Yes, I can run through the wizard and get the following barebones shell for my library...

// ===========================
library test;

uses
  SysUtils, Classes;

{$R *.RES}

function TestStrings(FirstParam: ShortString; SecondParam: ShortString):ShortString; stdcall;
begin
  Result := FirstParam + ', ' + SecondParam;
end;

exports TestStrings;

begin
end.

// ===========================

Everything is fine...until I want to start adding more code.

For instance, I am lost as to how to add new INTERNAL functions/procedures.  IOW, if I wanted the TestStrings function to use another function, which will only be used within the DLL and NOT be exported, then where/how does one define the function?  Do I do this...

// ===========================
library test;

uses
  SysUtils, Classes;

function AddBrackets(TextIn : ShortString) : ShortString;

{$R *.RES}

function TestStrings(FirstParam: ShortString; SecondParam: ShortString):ShortString; stdcall;
begin
  Result := FirstParam + ', ' + SecondParam;
end;

function AddBrackets(TextIn : ShortString) : ShortString;
begin
  Result := '<' + TextIn + '>';
end;

exports TestStrings;

begin
end.

// ===========================


...or this...

// ===========================
library test;

uses
  SysUtils, Classes;

function AddBrackets(TextIn : ShortString) : ShortString;

{$R *.RES}

function TestStrings(FirstParam: ShortString; SecondParam: ShortString):ShortString; stdcall;
begin
  Result := FirstParam + ', ' + SecondParam;
end;

exports TestStrings;

begin

function AddBrackets(TextIn : ShortString) : ShortString;
begin
  Result := '<' + TextIn + '>';
end;

end.

// ===========================

Neither of the above will compile, with the last example above generating the compile error "EXPORTS allowed only at global"

I can't find anything via googling that provides primer information regarding where to place INTERNAL functions/procedures in respect to exported function(s).
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Question by:Kapusta
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1 Comment
 
LVL 15

Accepted Solution

by:
mikelittlewood earned 500 total points
ID: 18786548
Do you only want to use it within the same function or for many?
If so you can embed procedures inside other procedures.

function TestStrings(FirstParam: ShortString; SecondParam: ShortString):ShortString; stdcall;

   function AddBrackets(TextIn : ShortString) : ShortString;
   begin
     Result := '<' + TextIn + '>';
   end;

begin
  Result := AddBrackets( FirstParam + ', ' + SecondParam);
end;
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