samples/sockets/server.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        server.cpp
   3 // Purpose:     Server for wxSocket demo
   4 // Author:      Guillermo Rodriguez Garcia <guille@iies.es>
   5 // Modified by:
   6 // Created:     1999/09/19
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1999 Guillermo Rodriguez Garcia
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ==========================================================================
  13 // declarations
  14 // ==========================================================================
  15
  16 // --------------------------------------------------------------------------
  17 // headers
  18 // --------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(__APPLE__)
  21 #  pragma implementation "server.cpp"
  22 #  pragma interface "server.cpp"
  23 #endif
  24
  25 // For compilers that support precompilation, includes "wx/wx.h".
  26 #include "wx/wxprec.h"
  27
  28 #ifdef __BORLANDC__
  29 #  pragma hdrstop
  30 #endif
  31
  32 // for all others, include the necessary headers
  33 #ifndef WX_PRECOMP
  34 #  include "wx/wx.h"
  35 #endif
  36
  37 #include "wx/socket.h"
  38
  39 // --------------------------------------------------------------------------
  40 // resources
  41 // --------------------------------------------------------------------------
  42
  43 // the application icon
  44 #if defined(__WXGTK__) || defined(__WXX11__) || defined(__WXMOTIF__) || defined(__WXMAC__)
  45 #  include "mondrian.xpm"
  46 #endif
  47
  48 // --------------------------------------------------------------------------
  49 // classes
  50 // --------------------------------------------------------------------------
  51
  52 // Define a new application type
  53 class MyApp : public wxApp
  54 {
  55 public:
  56   virtual bool OnInit();
  57 };
  58
  59 // Define a new frame type: this is going to be our main frame
  60 class MyFrame : public wxFrame
  61 {
  62 public:
  63   MyFrame();
  64   ~MyFrame();
  65
  66   // event handlers (these functions should _not_ be virtual)
  67   void OnQuit(wxCommandEvent& event);
  68   void OnAbout(wxCommandEvent& event);
  69   void OnServerEvent(wxSocketEvent& event);
  70   void OnSocketEvent(wxSocketEvent& event);
  71
  72   void Test1(wxSocketBase *sock);
  73   void Test2(wxSocketBase *sock);
  74   void Test3(wxSocketBase *sock);
  75
  76   // convenience functions
  77   void UpdateStatusBar();
  78
  79 private:
  80   wxSocketServer *m_server;
  81   wxTextCtrl     *m_text;
  82   wxMenu         *m_menuFile;
  83   wxMenuBar      *m_menuBar;
  84   bool            m_busy;
  85   int             m_numClients;
  86
  87   // any class wishing to process wxWidgets events must use this macro
  88   DECLARE_EVENT_TABLE()
  89 };
  90
  91 // --------------------------------------------------------------------------
  92 // constants
  93 // --------------------------------------------------------------------------
  94
  95 // IDs for the controls and the menu commands
  96 enum
  97 {
  98   // menu items
  99   SERVER_QUIT = 1000,
 100   SERVER_ABOUT,
 101
 102   // id for sockets
 103   SERVER_ID,
 104   SOCKET_ID
 105 };
 106
 107 // --------------------------------------------------------------------------
 108 // event tables and other macros for wxWidgets
 109 // --------------------------------------------------------------------------
 110
 111 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 112   EVT_MENU(SERVER_QUIT,  MyFrame::OnQuit)
 113   EVT_MENU(SERVER_ABOUT, MyFrame::OnAbout)
 114   EVT_SOCKET(SERVER_ID,  MyFrame::OnServerEvent)
 115   EVT_SOCKET(SOCKET_ID,  MyFrame::OnSocketEvent)
 116 END_EVENT_TABLE()
 117
 118 IMPLEMENT_APP(MyApp)
 119
 120
 121 // ==========================================================================
 122 // implementation
 123 // ==========================================================================
 124
 125 // --------------------------------------------------------------------------
 126 // the application class
 127 // --------------------------------------------------------------------------
 128
 129 bool MyApp::OnInit()
 130 {
 131   // Create the main application window
 132   MyFrame *frame = new MyFrame();
 133
 134   // Show it and tell the application that it's our main window
 135   frame->Show(true);
 136   SetTopWindow(frame);
 137
 138   // Success
 139   return true;
 140 }
 141
 142 // --------------------------------------------------------------------------
 143 // main frame
 144 // --------------------------------------------------------------------------
 145
 146 // frame constructor
 147
 148 MyFrame::MyFrame() : wxFrame((wxFrame *)NULL, wxID_ANY,
 149                              _("wxSocket demo: Server"),
 150                              wxDefaultPosition, wxSize(300, 200))
 151 {
 152   // Give the frame an icon
 153   SetIcon(wxICON(mondrian));
 154
 155   // Make menus
 156   m_menuFile = new wxMenu();
 157   m_menuFile->Append(SERVER_ABOUT, _("&About...\tCtrl-A"), _("Show about dialog"));
 158   m_menuFile->AppendSeparator();
 159   m_menuFile->Append(SERVER_QUIT, _("E&xit\tAlt-X"), _("Quit server"));
 160
 161   // Append menus to the menubar
 162   m_menuBar = new wxMenuBar();
 163   m_menuBar->Append(m_menuFile, _("&File"));
 164   SetMenuBar(m_menuBar);
 165
 166 #if wxUSE_STATUSBAR
 167   // Status bar
 168   CreateStatusBar(2);
 169 #endif // wxUSE_STATUSBAR
 170
 171   // Make a textctrl for logging
 172   m_text  = new wxTextCtrl(this, wxID_ANY,
 173                            _("Welcome to wxSocket demo: Server\n"),
 174                            wxDefaultPosition, wxDefaultSize,
 175                            wxTE_MULTILINE | wxTE_READONLY);
 176
 177   // Create the address - defaults to localhost:0 initially
 178   wxIPV4address addr;
 179   addr.Service(3000);
 180
 181   // Create the socket
 182   m_server = new wxSocketServer(addr);
 183
 184   // We use Ok() here to see if the server is really listening
 185   if (! m_server->Ok())
 186   {
 187     m_text->AppendText(_("Could not listen at the specified port !\n\n"));
 188     return;
 189   }
 190   else
 191   {
 192     m_text->AppendText(_("Server listening.\n\n"));
 193   }
 194
 195   // Setup the event handler and subscribe to connection events
 196   m_server->SetEventHandler(*this, SERVER_ID);
 197   m_server->SetNotify(wxSOCKET_CONNECTION_FLAG);
 198   m_server->Notify(true);
 199
 200   m_busy = false;
 201   m_numClients = 0;
 202   UpdateStatusBar();
 203 }
 204
 205 MyFrame::~MyFrame()
 206 {
 207   // No delayed deletion here, as the frame is dying anyway
 208   delete m_server;
 209 }
 210
 211 // event handlers
 212
 213 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 214 {
 215   // true is to force the frame to close
 216   Close(true);
 217 }
 218
 219 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 220 {
 221   wxMessageBox(_("wxSocket demo: Server\n(c) 1999 Guillermo Rodriguez Garcia\n"),
 222                _("About Server"),
 223                wxOK | wxICON_INFORMATION, this);
 224 }
 225
 226 void MyFrame::Test1(wxSocketBase *sock)
 227 {
 228   unsigned char len;
 229   char *buf;
 230
 231   m_text->AppendText(_("Test 1 begins\n"));
 232
 233   // Receive data from socket and send it back. We will first
 234   // get a byte with the buffer size, so we can specify the
 235   // exact size and use the wxSOCKET_WAITALL flag. Also, we
 236   // disabled input events so we won't have unwanted reentrance.
 237   // This way we can avoid the infamous wxSOCKET_BLOCK flag.
 238
 239   sock->SetFlags(wxSOCKET_WAITALL);
 240
 241   // Read the size
 242   sock->Read(&len, 1);
 243   buf = new char[len];
 244
 245   // Read the data
 246   sock->Read(buf, len);
 247   m_text->AppendText(_("Got the data, sending it back\n"));
 248
 249   // Write it back
 250   sock->Write(buf, len);
 251   delete[] buf;
 252
 253   m_text->AppendText(_("Test 1 ends\n\n"));
 254 }
 255
 256 void MyFrame::Test2(wxSocketBase *sock)
 257 {
 258 #define MAX_MSG_SIZE 10000
 259
 260   wxString s;
 261   wxChar *buf = new wxChar[MAX_MSG_SIZE];
 262   wxUint32 len;
 263
 264   m_text->AppendText(_("Test 2 begins\n"));
 265
 266   // We don't need to set flags because ReadMsg and WriteMsg
 267   // are not affected by them anyway.
 268
 269   // Read the message
 270   len = sock->ReadMsg(buf, MAX_MSG_SIZE * sizeof(wxChar)).LastCount();
 271   s.Printf(_("Client says: %s\n"), buf);
 272   m_text->AppendText(s);
 273   m_text->AppendText(_("Sending the data back\n"));
 274
 275   // Write it back
 276   sock->WriteMsg(buf, len);
 277   delete[] buf;
 278
 279   m_text->AppendText(_("Test 2 ends\n\n"));
 280
 281 #undef MAX_MSG_SIZE
 282 }
 283
 284 void MyFrame::Test3(wxSocketBase *sock)
 285 {
 286   unsigned char len;
 287   char *buf;
 288
 289   m_text->AppendText(_("Test 3 begins\n"));
 290
 291   // This test is similar to the first one, but the len is
 292   // expressed in kbytes - this tests large data transfers.
 293
 294   sock->SetFlags(wxSOCKET_WAITALL);
 295
 296   // Read the size
 297   sock->Read(&len, 1);
 298   buf = new char[len * 1024];
 299
 300   // Read the data
 301   sock->Read(buf, len * 1024);
 302   m_text->AppendText(_("Got the data, sending it back\n"));
 303
 304   // Write it back
 305   sock->Write(buf, len * 1024);
 306   delete[] buf;
 307
 308   m_text->AppendText(_("Test 3 ends\n\n"));
 309 }
 310
 311 void MyFrame::OnServerEvent(wxSocketEvent& event)
 312 {
 313   wxString s = _("OnServerEvent: ");
 314   wxSocketBase *sock;
 315
 316   switch(event.GetSocketEvent())
 317   {
 318     case wxSOCKET_CONNECTION : s.Append(_("wxSOCKET_CONNECTION\n")); break;
 319     default                  : s.Append(_("Unexpected event !\n")); break;
 320   }
 321
 322   m_text->AppendText(s);
 323
 324   // Accept new connection if there is one in the pending
 325   // connections queue, else exit. We use Accept(false) for
 326   // non-blocking accept (although if we got here, there
 327   // should ALWAYS be a pending connection).
 328
 329   sock = m_server->Accept(false);
 330
 331   if (sock)
 332   {
 333     m_text->AppendText(_("New client connection accepted\n\n"));
 334   }
 335   else
 336   {
 337     m_text->AppendText(_("Error: couldn't accept a new connection\n\n"));
 338     return;
 339   }
 340
 341   sock->SetEventHandler(*this, SOCKET_ID);
 342   sock->SetNotify(wxSOCKET_INPUT_FLAG | wxSOCKET_LOST_FLAG);
 343   sock->Notify(true);
 344
 345   m_numClients++;
 346   UpdateStatusBar();
 347 }
 348
 349 void MyFrame::OnSocketEvent(wxSocketEvent& event)
 350 {
 351   wxString s = _("OnSocketEvent: ");
 352   wxSocketBase *sock = event.GetSocket();
 353
 354   // First, print a message
 355   switch(event.GetSocketEvent())
 356   {
 357     case wxSOCKET_INPUT : s.Append(_("wxSOCKET_INPUT\n")); break;
 358     case wxSOCKET_LOST  : s.Append(_("wxSOCKET_LOST\n")); break;
 359     default             : s.Append(_("Unexpected event !\n")); break;
 360   }
 361
 362   m_text->AppendText(s);
 363
 364   // Now we process the event
 365   switch(event.GetSocketEvent())
 366   {
 367     case wxSOCKET_INPUT:
 368     {
 369       // We disable input events, so that the test doesn't trigger
 370       // wxSocketEvent again.
 371       sock->SetNotify(wxSOCKET_LOST_FLAG);
 372
 373       // Which test are we going to run?
 374       unsigned char c;
 375       sock->Read(&c, 1);
 376
 377       switch (c)
 378       {
 379         case 0xBE: Test1(sock); break;
 380         case 0xCE: Test2(sock); break;
 381         case 0xDE: Test3(sock); break;
 382         default:
 383           m_text->AppendText(_("Unknown test id received from client\n\n"));
 384       }
 385
 386       // Enable input events again.
 387       sock->SetNotify(wxSOCKET_LOST_FLAG | wxSOCKET_INPUT_FLAG);
 388       break;
 389     }
 390     case wxSOCKET_LOST:
 391     {
 392       m_numClients--;
 393
 394       // Destroy() should be used instead of delete wherever possible,
 395       // due to the fact that wxSocket uses 'delayed events' (see the
 396       // documentation for wxPostEvent) and we don't want an event to
 397       // arrive to the event handler (the frame, here) after the socket
 398       // has been deleted. Also, we might be doing some other thing with
 399       // the socket at the same time; for example, we might be in the
 400       // middle of a test or something. Destroy() takes care of all
 401       // this for us.
 402
 403       m_text->AppendText(_("Deleting socket.\n\n"));
 404       sock->Destroy();
 405       break;
 406     }
 407     default: ;
 408   }
 409
 410   UpdateStatusBar();
 411 }
 412
 413 // convenience functions
 414
 415 void MyFrame::UpdateStatusBar()
 416 {
 417 #if wxUSE_STATUSBAR
 418   wxString s;
 419   s.Printf(_("%d clients connected"), m_numClients);
 420   SetStatusText(s, 1);
 421 #endif // wxUSE_STATUSBAR
 422 }