Thank you, I had not attempted with ' var' for that I believed that LPHDEV is a pointer.
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How to decalre an C++ API function in Delphi
Dear Sirs:
I am integrating a data acquisition equipment to a program developed in Delphi, but the API's are for C++. They tell me that there is not any problem to use them in Delphi, but I have not been able, and I believe that the problem is in the declaration. One of the functions is the following one:
ECODE OLDAINITIALIZE (LPSTR LPSZNAME, LPHDEV LPHDEV)
In VB it is declared this way and it works well:
Private Declare Function olDaInitialize Lib "OLDAAPI32.DLL" _
(ByVal lpszName As String, ByRef lphDev As Long) As Long
But in delphi always gives the error:
Acces violation at xxxxxxxxx: write off address xxxxxxxxxx
Is somebody able to give me a suggestion of which the problem can be or like the function should be declared in delphi?
Best Regards.
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by: rllibbyPosted on 2004-06-01 at 14:21:06ID: 11207309
Have you tried:
function olDaInitialize(lpszName: PChar; var lphDev: LongWord): LongWord; stdcall; external 'OLDAAPI32.DLL';
Regards,
Russell