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Creating a DLL.

Posted on 2000-04-11
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Last Modified: 2010-04-04
I want to create a DLL. I select from menu File|New|DLL. Then I edit the "Library". And then?
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Question by:val84
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Accepted Solution

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rwilson032697 earned 100 total points
ID: 2706621
You would do something like this:

Write a procedures/functions to do what you want, eg:

library MyDLL;

// Etc

function CalculateSomething(AnArgument : Double) : Double; cdecl;

begin
  result := <Some calculation>
end;

end.

Lets call the DLL 'MyDLL.DLL'.

You could use this DLL in an application like this:

unit MyDLL;

interface

Function CalculateSomething(AnArgument : Double) : Double; cdecl;

implementation

Function CalculateSomething(AnArgument : Double) : Double; cdecl; external 'MyDLL.DLL' name 'CalculateSomething';
end;

end.

In some unit of your program you can add the MyDLL unit to the uses clause and call the function like this:

CalculateSomething(1.2);

Cheers,
Raymond.
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Author Comment

by:val84
ID: 2706881
Hi Raymond.
My problem is this: when I try to create a DLL, as I told you before, Delphi opens a "Project1.dpr" window. But I want to create a .DLL not a .DPR.
What am I supposed to do?
Alex.
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LVL 12

Expert Comment

by:rwilson032697
ID: 2706964
The project is always a .DPR file. When you compile the DLL project the result will be a .DLL file!

Cheers,

Raymond.
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Author Comment

by:val84
ID: 2707019
Hi Raymond.
It worked OK. All is well that ends well.
Thanks, Alex.
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