Issues passing data from DLL to Application

Question

I\'m a bit puzzled as to how Pointers should be properly used in my scenario. I have a DLL with some embedded resources in it. I expose a function in this DLL which passes binar

Answer 1

Another way passing the stream from a DLL to the application could be using interfaced streams.

implementation
uses MemoryStream_Interface;
{$R *.dfm}

Type
TGetStream = Procedure(var iStream:IDelphiStream);stdcall;

procedure TForm1.Button1Click(Sender: TObject);
var
 h:THandle;
 p:TGetStream;
 ms :IDelphiStream;
 j:TJpegImage;
begin
   ms := TInterfacedMemoryStream.Create;
   h := LoadLibrary('ShowStream.dll');
   if h <> 0 then
      try
      @p := GetProcAddress(h,'GetJpegStream');
      p(ms);
      ms.Position := 0;
      j := TJpegImage.create;
      Image1.Picture.Assign(j);
      j.Free;
      Image1.Picture.Graphic.LoadFromStream(TInterfacedMemoryStream(ms));
      finally
      FreeLibrary(h);
      end;
end;

The code for IDelphiStream can be found on http://www.delphipraxis.net.
I won't copy the content of MemoryStream_Interface to this post, because there are no copyright informations on the code from the mentioned page.