Re: Passing info between a DLL and an app

I am not sure if this will cure the problem. I have had bunches of
problems executing dlls in Delphi. Try executing your dll in a
procedure by itself like the one below. This seems to have cured my
dll execution problems.

procedure TForm1.LoadAndRunDLLProcedure(sDLL, sFunc : string);
type
TFunc_Start = function(pRiseSetLat, pRiseSetLong : string;
RiseSetOffset : real;
RiseOrSetSw, passmmddyyyy: string) : string;
var
Func_Start : TFunc_Start;
hDll : THandle;
FuncPtr : TFarProc;
sMsg : string;
begin
hDll := LoadLibrary( PChar( sDLL ) );

if (hDll > 32) then begin
FuncPtr := GetProcAddress( hDll, PChar( sFunc ) );
@Func_Start := FuncPtr;

if (@Func_Start <> nil) then begin
LabelRise.Caption := Func_Start(CurrencyEditN1.Text,
CurrencyEditW2.Text, -6, 'r',
FormatDateTime('mmddyyyy',
Now));
LabelSet.Caption := Func_Start(CurrencyEditN1.Text,
CurrencyEditW2.Text, -6, 's',
FormatDateTime('mmddyyyy',
Now));
end
else begin
sMsg := 'DLL entry point ' + sFunc + ' not found';
//procedure not found
MessageBox( 0, PChar( sMsg ), 'Error', MB_OK );
end;

FreeLibrary( hDll );
FuncPtr := NIL;

end
else begin
sMsg := 'File ' + sDLL +' not found';
//dll not found
MessageBox( 0, PChar( sMsg ), 'Error', MB_OK );
end;
end;

.

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