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 #ifdef __GNUG__
  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(__WXMOTIF__)
  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   wxPanel        *m_panel;
  82   wxTextCtrl     *m_text;
  83   wxMenu         *m_menuFile;
  84   wxMenuBar      *m_menuBar;
  85   bool            m_busy;
  86   int             m_numClients;
  87
  88   // any class wishing to process wxWindows events must use this macro
  89   DECLARE_EVENT_TABLE()
  90 };
  91
  92 // --------------------------------------------------------------------------
  93 // constants
  94 // --------------------------------------------------------------------------
  95
  96 // IDs for the controls and the menu commands
  97 enum
  98 {
  99   // menu items
 100   SERVER_QUIT = 1000,
 101   SERVER_ABOUT,
 102
 103   // id for sockets
 104   SERVER_ID,
 105   SOCKET_ID
 106 };
 107
 108 // --------------------------------------------------------------------------
 109 // event tables and other macros for wxWindows
 110 // --------------------------------------------------------------------------
 111
 112 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 113   EVT_MENU(SERVER_QUIT,  MyFrame::OnQuit)
 114   EVT_MENU(SERVER_ABOUT, MyFrame::OnAbout)
 115   EVT_SOCKET(SERVER_ID,  MyFrame::OnServerEvent)
 116   EVT_SOCKET(SOCKET_ID,  MyFrame::OnSocketEvent)
 117 END_EVENT_TABLE()
 118
 119 IMPLEMENT_APP(MyApp)
 120
 121
 122 // To append sockets for delayed deletion
 123 extern wxList wxPendingDelete;
 124
 125
 126 // ==========================================================================
 127 // implementation
 128 // ==========================================================================
 129
 130 // --------------------------------------------------------------------------
 131 // the application class
 132 // --------------------------------------------------------------------------
 133
 134 bool MyApp::OnInit()
 135 {
 136   // Create the main application window
 137   MyFrame *frame = new MyFrame();
 138
 139   // Show it and tell the application that it's our main window
 140   frame->Show(TRUE);
 141   SetTopWindow(frame);
 142
 143   // success
 144   return TRUE;
 145 }
 146
 147 // --------------------------------------------------------------------------
 148 // main frame
 149 // --------------------------------------------------------------------------
 150
 151 // frame constructor
 152 MyFrame::MyFrame() : wxFrame((wxFrame *)NULL, -1,
 153                              _T("wxSocket demo: Server"),
 154                              wxDefaultPosition, wxSize(300, 200))
 155 {
 156   // Give the frame an icon
 157   SetIcon(wxICON(mondrian));
 158
 159   // Make menus
 160   m_menuFile = new wxMenu();
 161   m_menuFile->Append(SERVER_ABOUT, _T("&About...\tCtrl-A"), _T("Show about dialog"));
 162   m_menuFile->AppendSeparator();
 163   m_menuFile->Append(SERVER_QUIT, _T("E&xit\tAlt-X"), _T("Quit server"));
 164
 165   // Append menus to the menubar
 166   m_menuBar = new wxMenuBar();
 167   m_menuBar->Append(m_menuFile, _T("&File"));
 168   SetMenuBar(m_menuBar);
 169
 170   // Status bar
 171   CreateStatusBar(2);
 172
 173   // Make a panel with a textctrl in it
 174   m_panel = new wxPanel(this, -1, wxPoint(0, 0), GetClientSize());
 175   m_text  = new wxTextCtrl(m_panel, -1,
 176                            _T("Welcome to wxSocket demo: Server\n"),
 177                            wxPoint(0, 0), m_panel->GetClientSize(),
 178                            wxTE_MULTILINE | wxTE_READONLY);
 179
 180   // Create the socket
 181   wxIPV4address addr;
 182   addr.Service(3000);
 183   addr.LocalHost();
 184
 185   m_server = new wxSocketServer(addr);
 186   m_server->SetEventHandler(*this, SERVER_ID);
 187   m_server->SetNotify(wxSOCKET_CONNECTION_FLAG);
 188   m_server->Notify(TRUE);
 189
 190   // We use Ok() here to see if the server is really listening
 191   if (m_server->Ok())
 192     m_text->AppendText(_T("Server listening.\n\n"));
 193   else
 194     m_text->AppendText(_T("Could not listen at the specified port !\n\n"));
 195
 196   m_busy = FALSE;
 197   m_numClients = 0;
 198   UpdateStatusBar();
 199 }
 200
 201 MyFrame::~MyFrame()
 202 {
 203   delete m_server;
 204 }
 205
 206 // event handlers
 207
 208 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 209 {
 210   // TRUE is to force the frame to close
 211   Close(TRUE);
 212 }
 213
 214 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 215 {
 216   wxMessageBox(_T("wxSocket demo: Server\n")
 217                _T("(c) 1999 Guillermo Rodriguez Garcia\n"),
 218                _T("About Server"),
 219                wxOK | wxICON_INFORMATION, this);
 220 }
 221
 222 void MyFrame::Test1(wxSocketBase *sock)
 223 {
 224   unsigned char len;
 225   char *buf;
 226
 227   m_text->AppendText(_T("Test 1 begins\n"));
 228
 229   // Receive data from socket and send it back. We will first
 230   // get a byte with the buffer size, so we can specify the
 231   // exact size and use the WAITALL flag. Also, we disabled
 232   // input events so we won't have unwanted reentrance. This
 233   // way we can avoid the infamous BLOCK (formerly SPEED) flag.
 234   //
 235   sock->SetFlags(wxSOCKET_WAITALL);
 236
 237   sock->Read((char *)&len, 1);
 238
 239   buf = (char *)malloc(len);
 240   sock->Read(buf, len);
 241   sock->Write(buf, len);
 242   free(buf);
 243
 244   m_text->AppendText(_T("Test 1 ends\n"));
 245 }
 246
 247 void MyFrame::Test2(wxSocketBase *sock)
 248 {
 249 #define MAX_MSG_SIZE 10000
 250
 251   wxString s;
 252   char *buf = (char *)malloc(MAX_MSG_SIZE);
 253   wxUint32 len;
 254
 255   m_text->AppendText(_T("Test 2 begins\n"));
 256
 257   // We don't need to set flags because ReadMsg and WriteMsg
 258   // are not affected by them anyway.
 259   //
 260   len = sock->ReadMsg(buf, MAX_MSG_SIZE).LastCount();
 261
 262   s.Printf(_T("Client says: %s\n"), buf);
 263   m_text->AppendText(s);
 264
 265   sock->WriteMsg(buf, len);
 266   free(buf);
 267
 268   m_text->AppendText(_T("Test 2 ends\n"));
 269
 270 #undef MAX_MSG_SIZE
 271 }
 272
 273 void MyFrame::Test3(wxSocketBase *sock)
 274 {
 275   m_text->AppendText(_T("Test 3 begins\n"));
 276   m_text->AppendText(_T("(not implemented)\n"));
 277   m_text->AppendText(_T("Test 3 ends\n"));
 278 }
 279
 280 void MyFrame::OnServerEvent(wxSocketEvent& event)
 281 {
 282   wxString s = _T("OnServerEvent: ");
 283   wxSocketBase *sock;
 284
 285   switch(event.SocketEvent())
 286   {
 287     case wxSOCKET_CONNECTION : s.Append(_T("wxSOCKET_CONNECTION\n")); break;
 288     default                  : s.Append(_T("Unexpected event !\n")); break;
 289   }
 290
 291   m_text->AppendText(s);
 292
 293   // Accept new connection if there is one in the pending
 294   // connections queue, else exit. We use Accept(FALSE) for
 295   // non-blocking accept (although if we got here, there
 296   // should ALWAYS be a pending connection).
 297   //
 298   sock = m_server->Accept(FALSE);
 299
 300   if (sock)
 301   {
 302     m_text->AppendText(_T("New client connection accepted\n"));
 303   }
 304   else
 305   {
 306     m_text->AppendText(_T("Error: couldn't accept a new connection"));
 307     return;
 308   }
 309
 310   sock->SetEventHandler(*this, SOCKET_ID);
 311   sock->SetNotify(wxSOCKET_INPUT_FLAG | wxSOCKET_LOST_FLAG);
 312   sock->Notify(TRUE);
 313
 314   m_numClients++;
 315   UpdateStatusBar();
 316 }
 317
 318 void MyFrame::OnSocketEvent(wxSocketEvent& event)
 319 {
 320   wxSocketBase *sock = event.Socket();
 321   wxString s = _T("OnSocketEvent: ");
 322
 323   // We first print a msg
 324   switch(event.SocketEvent())
 325   {
 326     case wxSOCKET_INPUT: s.Append(_T("wxSOCKET_INPUT\n")); break;
 327     case wxSOCKET_LOST:  s.Append(_T("wxSOCKET_LOST\n")); break;
 328     default:             s.Append(_T("unexpected event !\n"));
 329   }
 330
 331   m_text->AppendText(s);
 332
 333   // Now we process the event
 334   switch(event.SocketEvent())
 335   {
 336     case wxSOCKET_INPUT:
 337     {
 338       // We disable input events, so that the test doesn't trigger
 339       // wxSocketEvent again.
 340       sock->SetNotify(wxSOCKET_LOST_FLAG);
 341
 342       // Which test are we going to run?
 343       unsigned char c;
 344       sock->Read((char *)&c ,1);
 345
 346       switch (c)
 347       {
 348         case 0xBE: Test1(sock); break;
 349         case 0xCE: Test2(sock); break;
 350         case 0xDE: Test3(sock); break;
 351         default: s.Append(_T("Unknown test id received from client\n"));
 352       }
 353
 354       // Enable input events again.
 355       sock->SetNotify(wxSOCKET_LOST_FLAG | wxSOCKET_INPUT_FLAG);
 356       break;
 357     }
 358     case wxSOCKET_LOST:
 359     {
 360       m_numClients--;
 361
 362       // We cannot delete the socket right now because we can
 363       // be in the middle of a test or something. So we append
 364       // it to the list of objects to be deleted.
 365       m_text->AppendText(_T("Deleting socket.\n"));
 366       wxPendingDelete.Append(sock);
 367       break;
 368     }
 369     default: ;
 370   }
 371
 372   UpdateStatusBar();
 373 }
 374
 375 // convenience functions
 376
 377 void MyFrame::UpdateStatusBar()
 378 {
 379   wxString s;
 380   s.Printf(_T("%d clients connected"), m_numClients);
 381   SetStatusText(s, 1);
 382 }