Re:PLEASE HELP! Calling DLL functions from a Delphi 1 app
On Tue, 03 Jun 1997 10:04:39 -0700, Karl Soar <k.d.s...@shu.ac.uk>
wrote:
Quote
>Hi,
>Probably a 'dumb newbie' type question to some of you, but I'm desperate
>for a solution and have no pride!
>I'm trying to access functions in a 16-bit DLL, written by a
>third-party in C++. I'm using Delphi 1 under Windows 3.11.
>Specifically, the compiler complains whenever I put the function
>declaration and 'external' keyword in the 'interface' section of my
>code module.
>I've followed the on-line help to the letter, and as
>far as I can see it's either wrong or missing something really
>important!
The "external" portion of the declaration needs to be in the
implmentation section of the unit, as that effectively IS the
"implementation" of that function as far as the unit is concerned:
unit Foo ;
interface
uses
Whatever ;
function ImportedCFunc( someparam : sometype ): someothertype ;
implementation
function ImportedCFunc( someparam : sometype ): someothertype ;
external 'DLLNAME' index 1 ;
end .
note that you don't have to recapitulate the parameter list and return
type in the implementation section, but I always find it useful to do
so, especially in large import units.
Quote
>Variations on the theme even include a system-level application
>error complaining of an unspecified Dynalink ?!?!?!?!?!
That's a equine possessing variant pigmentation -- Are you sure you
have the DLL name spelled correctly in the function definition? Is it
located somewhere on the default search path? You should also know
that D1 doesn't support file extensions in the DLLNAME string,
including one prevents the DLL from being found (if you need to use a
DLL that doesn't have the .DLL extension, you either need to rename it
or use LoadLibrary() instead).
Quote
>I can't find anything to help me. Most literature seems to
>pertain to Delphi 2.
>Can anyone help?
>=====================================================
>Karl D Soar, Researcher | "What Englishman will turn
>School of Construction | his mind to politics
>Sheffield Hallam Uni. | if he can afford to keep
>k.d.s...@shu.ac.uk | a car?"
>phone : +44 114 2533599 | - George Bernard Shaw
>=====================================================
HTH
Stephen Posey
slpo...@concentric.net
