Problem with Pointers and DLL's
Quote
Petter Kvinlaug <pette...@oslonett.no> wrote:
>I'm trying to use some DLL's from the Reflection API. Some of them return pointers in the
>parameterlist. The interface to the DLL goes something like this:
>Type
> TWindowID = ^Longint;
>Function rcGetWindowByIndex(var1:Longint; Var Var2:PWindowID):Word; External 'R8API';
>Main Program:
>Var
> PWindowID:TWindowID;
> Result:Word;
> WinNum,ID:Longint;
>Begin
> .
> .
> Result:=rcGetWindowByIndex(WinNum,PWindowID);
>So far so good. I can see from the de{*word*81} that Result=0 (That's OK) and
>the pointer (PWindowID) points to the correct value.
>But when i'm trying to transfer that value to a variable, like this;
> ID:=WindowID^;
>Windows reponds width a General Protection Fault.
>How can I transfer the value that WindowID points to, to a variable Without getting GP faults.
I think that you may not be initialising your PWindowID variable ?
Have you got :-
new( PWindowID )
in your code somewhere before the call to rcGetWindowByIndex() ?
Let me know if this sorts it please.
Scott Paterson
Willenhall, West Mids, UK.
