Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Delphi Dll Issue

Posted on 2008-10-09
2
Medium Priority
?
726 Views
Last Modified: 2008-10-09
Having a little issue here with a Delphi Dll.
Problem is when I close the application that uses the Dll the process still shows up, which means my application isn't terminating properly.

Dll Code

library dllclient;

uses
  SysUtils,
  Classes,
  IdTCPClient;

{$R *.res}

var
  Client: TCPClient;

function TcpConnect(_host: pchar; _port: integer) : Integer; export; stdcall;
begin
  Client:= TCPClient.Create(nil);
  Client.Port:= _port;
  Client.Host:= _host;
  try
    Client.Connect;
  except
    result:= -1;
  end;
  result:= Integer(Client);
end;

function TcpConnected(socket: integer) : Boolean; export; stdcall;
begin
  result:= TcpClient(socket).Connected;
end;

function CloseSocket(socket: integer) : Boolean; export; stdcall;
begin
  try
    if Assigned(TcpClient(socket)) and (TcpClient(socket).Connected) then
    begin
      TcpClient(socket).IOHandler.InputBuffer.Clear;
      TcpClient(socket).Socket.Close;
      TcpClient(socket).Free;
    end;
  except
    result:= False;
  end;
  result:= True;
end;

exports TcpConnect, TcpConnected, CloseSocket;

begin
end.

Form Code
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, IdBaseComponent, IdComponent, IdCustomTCPServer,
  IdTCPServer, IdContext;

type
  TForm1 = class(TForm)
    IdTCPServer1: TIdTCPServer;
    Button1: TButton;
    Memo1: TMemo;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure IdTCPServer1Execute(AContext: TIdContext);
    procedure Button2Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

var
  socketint: integer;

function TcpConnect(host: PChar; port: integer):Integer; stdcall; external 'dllclient.dll';
function TcpConnected(socket: Integer): Boolean; stdcall; external 'dllclient.dll';
function CloseSocket(socket: Integer) : Boolean; stdcall; external 'dllclient.dll';

procedure TForm1.Button1Click(Sender: TObject);
begin
  if(socketint = -1) then
  begin
    socketint:= TcpConnect('localhost', 33333);
    memo1.Lines.add(IntToStr(socketint));

    if(TcpConnected(socketint)) then
      memo1.lines.add('We are connected!');
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  if(socketint <> -1) then
  begin
    if(CloseSocket(socketint)) then
    begin
      memo1.lines.add('Socket Closed!');
      socketint:= -1;
    end
    else
      memo1.lines.add('Failed to Close Socket');
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  socketint:= -1;
end;

procedure TForm1.IdTCPServer1Execute(AContext: TIdContext);
begin
  while(True) do
  begin
    sleep(100);
  end;
end;

end.
0
Comment
Question by:yewnix
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 6

Accepted Solution

by:
ChristianWimmer earned 2000 total points
ID: 22682690
What about  TForm1.IdTCPServer1Execute?
It's obviously an endless loop. I guess this could be a problem. Maybe you should add a Terminate variable or similar.
0
 

Author Comment

by:yewnix
ID: 22682918
Ya.. I'm an idiot. Shouldn't of even of had to post this.

Changed that code to..

if not (AContext.Connection.IOHandler.InputBufferIsEmpty) then
begin
   // do stuff here
end
else
   sleep(100);

0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : http://www.videocopilot.net/presets/after_shake/ All lightning effects with instructions : http://www.mediaf…
Have you created a query with information for a calendar? ... and then, abra-cadabra, the calendar is done?! I am going to show you how to make that happen. Visualize your data!  ... really see it To use the code to create a calendar from a q…
Suggested Courses

604 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question