samples/exec/exec.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        exec.cpp
   3 // Purpose:     exec sample demonstrates wxExecute and related functions
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     15.01.00
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Vadim Zeitlin
   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 "exec.cpp"
  22     #pragma interface "exec.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 (this file is usually all you
  33 // need because it includes almost all "standard" wxWindows headers
  34 #ifndef WX_PRECOMP
  35     #include "wx/app.h"
  36     #include "wx/log.h"
  37     #include "wx/frame.h"
  38     #include "wx/panel.h"
  39
  40     #include "wx/timer.h"
  41
  42     #include "wx/utils.h"
  43     #include "wx/menu.h"
  44
  45     #include "wx/msgdlg.h"
  46     #include "wx/textdlg.h"
  47     #include "wx/filedlg.h"
  48     #include "wx/choicdlg.h"
  49
  50     #include "wx/button.h"
  51     #include "wx/textctrl.h"
  52     #include "wx/listbox.h"
  53
  54     #include "wx/sizer.h"
  55 #endif
  56
  57 #include "wx/txtstrm.h"
  58
  59 #include "wx/process.h"
  60
  61 #include "wx/mimetype.h"
  62
  63 #ifdef __WINDOWS__
  64     #include "wx/dde.h"
  65 #endif // __WINDOWS__
  66
  67 // ----------------------------------------------------------------------------
  68 // the usual application and main frame classes
  69 // ----------------------------------------------------------------------------
  70
  71 // Define a new application type, each program should derive a class from wxApp
  72 class MyApp : public wxApp
  73 {
  74 public:
  75     // override base class virtuals
  76     // ----------------------------
  77
  78     // this one is called on application startup and is a good place for the app
  79     // initialization (doing it here and not in the ctor allows to have an error
  80     // return: if OnInit() returns false, the application terminates)
  81     virtual bool OnInit();
  82 };
  83
  84 // Define an array of process pointers used by MyFrame
  85 class MyPipedProcess;
  86 WX_DEFINE_ARRAY_NO_PTR(MyPipedProcess *, MyProcessesArray);
  87
  88 // Define a new frame type: this is going to be our main frame
  89 class MyFrame : public wxFrame
  90 {
  91 public:
  92     // ctor(s)
  93     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  94
  95     // event handlers (these functions should _not_ be virtual)
  96     void OnQuit(wxCommandEvent& event);
  97
  98     void OnKill(wxCommandEvent& event);
  99
 100     void OnClear(wxCommandEvent& event);
 101
 102     void OnSyncExec(wxCommandEvent& event);
 103     void OnAsyncExec(wxCommandEvent& event);
 104     void OnShell(wxCommandEvent& event);
 105     void OnExecWithRedirect(wxCommandEvent& event);
 106     void OnExecWithPipe(wxCommandEvent& event);
 107
 108     void OnPOpen(wxCommandEvent& event);
 109
 110     void OnFileExec(wxCommandEvent& event);
 111
 112     void OnAbout(wxCommandEvent& event);
 113
 114     // polling output of async processes
 115     void OnTimer(wxTimerEvent& event);
 116     void OnIdle(wxIdleEvent& event);
 117
 118     // for MyPipedProcess
 119     void OnProcessTerminated(MyPipedProcess *process);
 120     wxListBox *GetLogListBox() const { return m_lbox; }
 121
 122 private:
 123     void ShowOutput(const wxString& cmd,
 124                     const wxArrayString& output,
 125                     const wxString& title);
 126
 127     void DoAsyncExec(const wxString& cmd);
 128
 129     void AddAsyncProcess(MyPipedProcess *process)
 130     {
 131         if ( m_running.IsEmpty() )
 132         {
 133             // we want to start getting the timer events to ensure that a
 134             // steady stream of idle events comes in -- otherwise we
 135             // wouldn't be able to poll the child process input
 136             m_timerIdleWakeUp.Start(100);
 137         }
 138         //else: the timer is already running
 139
 140         m_running.Add(process);
 141     }
 142
 143     void RemoveAsyncProcess(MyPipedProcess *process)
 144     {
 145         m_running.Remove(process);
 146
 147         if ( m_running.IsEmpty() )
 148         {
 149             // we don't need to get idle events all the time any more
 150             m_timerIdleWakeUp.Stop();
 151         }
 152     }
 153
 154     // the PID of the last process we launched asynchronously
 155     long m_pidLast;
 156
 157     // last command we executed
 158     wxString m_cmdLast;
 159
 160 #ifdef __WINDOWS__
 161     void OnDDEExec(wxCommandEvent& event);
 162     void OnDDERequest(wxCommandEvent& event);
 163
 164     bool GetDDEServer();
 165
 166     // last params of a DDE transaction
 167     wxString m_server,
 168              m_topic,
 169              m_cmdDde;
 170 #endif // __WINDOWS__
 171
 172     wxListBox *m_lbox;
 173
 174     MyProcessesArray m_running;
 175
 176     // the idle event wake up timer
 177     wxTimer m_timerIdleWakeUp;
 178
 179     // any class wishing to process wxWindows events must use this macro
 180     DECLARE_EVENT_TABLE()
 181 };
 182
 183 // ----------------------------------------------------------------------------
 184 // MyPipeFrame: allows the user to communicate with the child process
 185 // ----------------------------------------------------------------------------
 186
 187 class MyPipeFrame : public wxFrame
 188 {
 189 public:
 190     MyPipeFrame(wxFrame *parent,
 191                 const wxString& cmd,
 192                 wxProcess *process);
 193
 194 protected:
 195     void OnTextEnter(wxCommandEvent& event) { DoSend(); }
 196     void OnBtnSend(wxCommandEvent& event) { DoSend(); }
 197     void OnBtnGet(wxCommandEvent& event) { DoGet(); }
 198
 199     void OnClose(wxCloseEvent& event);
 200
 201     void OnProcessTerm(wxProcessEvent& event);
 202
 203     void DoSend()
 204     {
 205         m_out.WriteString(m_textIn->GetValue() + _T('\n'));
 206         m_textIn->Clear();
 207
 208         DoGet();
 209     }
 210
 211     void DoGet();
 212
 213 private:
 214     wxProcess *m_process;
 215
 216     wxTextInputStream m_in;
 217     wxTextOutputStream m_out;
 218
 219     wxTextCtrl *m_textIn,
 220                *m_textOut;
 221
 222     DECLARE_EVENT_TABLE()
 223 };
 224
 225 // ----------------------------------------------------------------------------
 226 // wxProcess-derived classes
 227 // ----------------------------------------------------------------------------
 228
 229 // This is the handler for process termination events
 230 class MyProcess : public wxProcess
 231 {
 232 public:
 233     MyProcess(MyFrame *parent, const wxString& cmd)
 234         : wxProcess(parent), m_cmd(cmd)
 235     {
 236         m_parent = parent;
 237     }
 238
 239     // instead of overriding this virtual function we might as well process the
 240     // event from it in the frame class - this might be more convenient in some
 241     // cases
 242     virtual void OnTerminate(int pid, int status);
 243
 244 protected:
 245     MyFrame *m_parent;
 246     wxString m_cmd;
 247 };
 248
 249 // A specialization of MyProcess for redirecting the output
 250 class MyPipedProcess : public MyProcess
 251 {
 252 public:
 253     MyPipedProcess(MyFrame *parent, const wxString& cmd)
 254         : MyProcess(parent, cmd)
 255         {
 256             Redirect();
 257         }
 258
 259     virtual void OnTerminate(int pid, int status);
 260
 261     virtual bool HasInput();
 262 };
 263
 264 // A version of MyPipedProcess which also sends input to the stdin of the
 265 // child process
 266 class MyPipedProcess2 : public MyPipedProcess
 267 {
 268 public:
 269     MyPipedProcess2(MyFrame *parent, const wxString& cmd, const wxString& input)
 270         : MyPipedProcess(parent, cmd), m_input(input)
 271         {
 272         }
 273
 274     virtual bool HasInput();
 275
 276 private:
 277     wxString m_input;
 278 };
 279
 280 // ----------------------------------------------------------------------------
 281 // constants
 282 // ----------------------------------------------------------------------------
 283
 284 // IDs for the controls and the menu commands
 285 enum
 286 {
 287     // menu items
 288     Exec_Quit = 100,
 289     Exec_Kill,
 290     Exec_ClearLog,
 291     Exec_SyncExec = 200,
 292     Exec_AsyncExec,
 293     Exec_Shell,
 294     Exec_POpen,
 295     Exec_OpenFile,
 296     Exec_DDEExec,
 297     Exec_DDERequest,
 298     Exec_Redirect,
 299     Exec_Pipe,
 300     Exec_About = 300,
 301
 302     // control ids
 303     Exec_Btn_Send = 1000,
 304     Exec_Btn_Get
 305 };
 306
 307 static const wxChar *DIALOG_TITLE = _T("Exec sample");
 308
 309 // ----------------------------------------------------------------------------
 310 // event tables and other macros for wxWindows
 311 // ----------------------------------------------------------------------------
 312
 313 // the event tables connect the wxWindows events with the functions (event
 314 // handlers) which process them. It can be also done at run-time, but for the
 315 // simple menu events like this the static method is much simpler.
 316 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 317     EVT_MENU(Exec_Quit,  MyFrame::OnQuit)
 318     EVT_MENU(Exec_Kill,  MyFrame::OnKill)
 319     EVT_MENU(Exec_ClearLog,  MyFrame::OnClear)
 320
 321     EVT_MENU(Exec_SyncExec, MyFrame::OnSyncExec)
 322     EVT_MENU(Exec_AsyncExec, MyFrame::OnAsyncExec)
 323     EVT_MENU(Exec_Shell, MyFrame::OnShell)
 324     EVT_MENU(Exec_Redirect, MyFrame::OnExecWithRedirect)
 325     EVT_MENU(Exec_Pipe, MyFrame::OnExecWithPipe)
 326
 327     EVT_MENU(Exec_POpen, MyFrame::OnPOpen)
 328
 329     EVT_MENU(Exec_OpenFile, MyFrame::OnFileExec)
 330
 331 #ifdef __WINDOWS__
 332     EVT_MENU(Exec_DDEExec, MyFrame::OnDDEExec)
 333     EVT_MENU(Exec_DDERequest, MyFrame::OnDDERequest)
 334 #endif // __WINDOWS__
 335
 336     EVT_MENU(Exec_About, MyFrame::OnAbout)
 337
 338     EVT_IDLE(MyFrame::OnIdle)
 339
 340     EVT_TIMER(-1, MyFrame::OnTimer)
 341 END_EVENT_TABLE()
 342
 343 BEGIN_EVENT_TABLE(MyPipeFrame, wxFrame)
 344     EVT_BUTTON(Exec_Btn_Send, MyPipeFrame::OnBtnSend)
 345     EVT_BUTTON(Exec_Btn_Get, MyPipeFrame::OnBtnGet)
 346
 347     EVT_TEXT_ENTER(-1, MyPipeFrame::OnTextEnter)
 348
 349     EVT_CLOSE(MyPipeFrame::OnClose)
 350
 351     EVT_END_PROCESS(-1, MyPipeFrame::OnProcessTerm)
 352 END_EVENT_TABLE()
 353
 354 // Create a new application object: this macro will allow wxWindows to create
 355 // the application object during program execution (it's better than using a
 356 // static object for many reasons) and also declares the accessor function
 357 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 358 // not wxApp)
 359 IMPLEMENT_APP(MyApp)
 360
 361 // ============================================================================
 362 // implementation
 363 // ============================================================================
 364
 365 // ----------------------------------------------------------------------------
 366 // the application class
 367 // ----------------------------------------------------------------------------
 368
 369 // `Main program' equivalent: the program execution "starts" here
 370 bool MyApp::OnInit()
 371 {
 372     // Create the main application window
 373     MyFrame *frame = new MyFrame(_T("Exec wxWindows sample"),
 374                                  wxDefaultPosition, wxSize(500, 140));
 375
 376     // Show it and tell the application that it's our main window
 377     frame->Show(TRUE);
 378     SetTopWindow(frame);
 379
 380     // success: wxApp::OnRun() will be called which will enter the main message
 381     // loop and the application will run. If we returned FALSE here, the
 382     // application would exit immediately.
 383     return TRUE;
 384 }
 385
 386 // ----------------------------------------------------------------------------
 387 // main frame
 388 // ----------------------------------------------------------------------------
 389
 390 #ifdef __VISUALC__
 391 #pragma warning(disable: 4355) // this used in base member initializer list
 392 #endif
 393
 394 // frame constructor
 395 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 396        : wxFrame((wxFrame *)NULL, -1, title, pos, size),
 397          m_timerIdleWakeUp(this)
 398 {
 399     m_pidLast = 0;
 400
 401 #ifdef __WXMAC__
 402     // we need this in order to allow the about menu relocation, since ABOUT is
 403     // not the default id of the about menu
 404     wxApp::s_macAboutMenuItemId = Exec_About;
 405 #endif
 406
 407     // create a menu bar
 408     wxMenu *menuFile = new wxMenu(_T(""), wxMENU_TEAROFF);
 409     menuFile->Append(Exec_Kill, _T("&Kill process...\tCtrl-K"),
 410                      _T("Kill a process by PID"));
 411     menuFile->AppendSeparator();
 412     menuFile->Append(Exec_ClearLog, _T("&Clear log\tCtrl-C"),
 413                      _T("Clear the log window"));
 414     menuFile->AppendSeparator();
 415     menuFile->Append(Exec_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
 416
 417     wxMenu *execMenu = new wxMenu;
 418     execMenu->Append(Exec_SyncExec, _T("Sync &execution...\tCtrl-E"),
 419                      _T("Launch a program and return when it terminates"));
 420     execMenu->Append(Exec_AsyncExec, _T("&Async execution...\tCtrl-A"),
 421                      _T("Launch a program and return immediately"));
 422     execMenu->Append(Exec_Shell, _T("Execute &shell command...\tCtrl-S"),
 423                      _T("Launch a shell and execute a command in it"));
 424     execMenu->AppendSeparator();
 425     execMenu->Append(Exec_Redirect, _T("Capture command &output...\tCtrl-O"),
 426                      _T("Launch a program and capture its output"));
 427     execMenu->Append(Exec_Pipe, _T("&Pipe through command..."),
 428                      _T("Pipe a string through a filter"));
 429     execMenu->Append(Exec_POpen, _T("&Open a pipe to a command...\tCtrl-P"),
 430                      _T("Open a pipe to and from another program"));
 431
 432     execMenu->AppendSeparator();
 433     execMenu->Append(Exec_OpenFile, _T("Open &file...\tCtrl-F"),
 434                      _T("Launch the command to open this kind of files"));
 435 #ifdef __WINDOWS__
 436     execMenu->AppendSeparator();
 437     execMenu->Append(Exec_DDEExec, _T("Execute command via &DDE...\tCtrl-D"));
 438     execMenu->Append(Exec_DDERequest, _T("Send DDE &request...\tCtrl-R"));
 439 #endif
 440
 441     wxMenu *helpMenu = new wxMenu(_T(""), wxMENU_TEAROFF);
 442     helpMenu->Append(Exec_About, _T("&About...\tF1"), _T("Show about dialog"));
 443
 444     // now append the freshly created menu to the menu bar...
 445     wxMenuBar *menuBar = new wxMenuBar();
 446     menuBar->Append(menuFile, _T("&File"));
 447     menuBar->Append(execMenu, _T("&Exec"));
 448     menuBar->Append(helpMenu, _T("&Help"));
 449
 450     // ... and attach this menu bar to the frame
 451     SetMenuBar(menuBar);
 452
 453     // create the listbox in which we will show misc messages as they come
 454     m_lbox = new wxListBox(this, -1);
 455     wxFont font(12, wxFONTFAMILY_TELETYPE, wxFONTSTYLE_NORMAL,
 456                 wxFONTWEIGHT_NORMAL);
 457     if ( font.Ok() )
 458         m_lbox->SetFont(font);
 459
 460 #if wxUSE_STATUSBAR
 461     // create a status bar just for fun (by default with 1 pane only)
 462     CreateStatusBar();
 463     SetStatusText(_T("Welcome to wxWindows exec sample!"));
 464 #endif // wxUSE_STATUSBAR
 465 }
 466
 467 // ----------------------------------------------------------------------------
 468 // event handlers: file and help menu
 469 // ----------------------------------------------------------------------------
 470
 471 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 472 {
 473     // TRUE is to force the frame to close
 474     Close(TRUE);
 475 }
 476
 477 void MyFrame::OnClear(wxCommandEvent& WXUNUSED(event))
 478 {
 479     m_lbox->Clear();
 480 }
 481
 482 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 483 {
 484     wxMessageBox(_T("Exec wxWindows Sample\n© 2000-2002 Vadim Zeitlin"),
 485                  _T("About Exec"), wxOK | wxICON_INFORMATION, this);
 486 }
 487
 488 void MyFrame::OnKill(wxCommandEvent& WXUNUSED(event))
 489 {
 490     long pid = wxGetNumberFromUser(_T("Please specify the process to kill"),
 491                                    _T("Enter PID:"),
 492                                    _T("Exec question"),
 493                                    m_pidLast,
 494                                    // we need the full unsigned int range
 495                                    -INT_MAX, INT_MAX,
 496                                    this);
 497     if ( pid == -1 )
 498     {
 499         // cancelled
 500         return;
 501     }
 502
 503     static const wxString signalNames[] =
 504     {
 505         _T("Just test (SIGNONE)"),
 506         _T("Hangup (SIGHUP)"),
 507         _T("Interrupt (SIGINT)"),
 508         _T("Quit (SIGQUIT)"),
 509         _T("Illegal instruction (SIGILL)"),
 510         _T("Trap (SIGTRAP)"),
 511         _T("Abort (SIGABRT)"),
 512         _T("Emulated trap (SIGEMT)"),
 513         _T("FP exception (SIGFPE)"),
 514         _T("Kill (SIGKILL)"),
 515         _T("Bus (SIGBUS)"),
 516         _T("Segment violation (SIGSEGV)"),
 517         _T("System (SIGSYS)"),
 518         _T("Broken pipe (SIGPIPE)"),
 519         _T("Alarm (SIGALRM)"),
 520         _T("Terminate (SIGTERM)"),
 521     };
 522
 523     int sig = wxGetSingleChoiceIndex(_T("How to kill the process?"),
 524                                      _T("Exec question"),
 525                                      WXSIZEOF(signalNames), signalNames,
 526                                      this);
 527     switch ( sig )
 528     {
 529         default:
 530             wxFAIL_MSG( _T("unexpected return value") );
 531             // fall through
 532
 533         case -1:
 534             // cancelled
 535             return;
 536
 537         case wxSIGNONE:
 538         case wxSIGHUP:
 539         case wxSIGINT:
 540         case wxSIGQUIT:
 541         case wxSIGILL:
 542         case wxSIGTRAP:
 543         case wxSIGABRT:
 544         case wxSIGEMT:
 545         case wxSIGFPE:
 546         case wxSIGKILL:
 547         case wxSIGBUS:
 548         case wxSIGSEGV:
 549         case wxSIGSYS:
 550         case wxSIGPIPE:
 551         case wxSIGALRM:
 552         case wxSIGTERM:
 553             break;
 554     }
 555
 556     if ( sig == 0 )
 557     {
 558         if ( wxProcess::Exists(pid) )
 559             wxLogStatus(_T("Process %ld is running."), pid);
 560         else
 561             wxLogStatus(_T("No process with pid = %ld."), pid);
 562     }
 563     else // not SIGNONE
 564     {
 565         wxKillError rc = wxProcess::Kill(pid, (wxSignal)sig);
 566         if ( rc == wxKILL_OK )
 567         {
 568             wxLogStatus(_T("Process %ld killed with signal %d."), pid, sig);
 569         }
 570         else
 571         {
 572             static const wxChar *errorText[] =
 573             {
 574                 _T(""), // no error
 575                 _T("signal not supported"),
 576                 _T("permission denied"),
 577                 _T("no such process"),
 578                 _T("unspecified error"),
 579             };
 580
 581             wxLogStatus(_T("Failed to kill process %ld with signal %d: %s"),
 582                         pid, sig, errorText[rc]);
 583         }
 584     }
 585 }
 586
 587 // ----------------------------------------------------------------------------
 588 // event handlers: exec menu
 589 // ----------------------------------------------------------------------------
 590
 591 void MyFrame::DoAsyncExec(const wxString& cmd)
 592 {
 593     wxProcess *process = new MyProcess(this, cmd);
 594     m_pidLast = wxExecute(cmd, wxEXEC_ASYNC, process);
 595     if ( !m_pidLast )
 596     {
 597         wxLogError( _T("Execution of '%s' failed."), cmd.c_str() );
 598
 599         delete process;
 600     }
 601     else
 602     {
 603         wxLogStatus( _T("Process %ld (%s) launched."),
 604             m_pidLast, cmd.c_str() );
 605
 606         m_cmdLast = cmd;
 607     }
 608 }
 609
 610 void MyFrame::OnSyncExec(wxCommandEvent& WXUNUSED(event))
 611 {
 612     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 613                                      DIALOG_TITLE,
 614                                      m_cmdLast);
 615
 616     if ( !cmd )
 617         return;
 618
 619     wxLogStatus( _T("'%s' is running please wait..."), cmd.c_str() );
 620
 621     int code = wxExecute(cmd, wxEXEC_SYNC);
 622
 623     wxLogStatus(_T("Process '%s' terminated with exit code %d."),
 624         cmd.c_str(), code);
 625
 626     m_cmdLast = cmd;
 627 }
 628
 629 void MyFrame::OnAsyncExec(wxCommandEvent& WXUNUSED(event))
 630 {
 631     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 632                                      DIALOG_TITLE,
 633                                      m_cmdLast);
 634
 635     if ( !cmd )
 636         return;
 637
 638     DoAsyncExec(cmd);
 639 }
 640
 641 void MyFrame::OnShell(wxCommandEvent& WXUNUSED(event))
 642 {
 643     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 644                                      DIALOG_TITLE,
 645                                      m_cmdLast);
 646
 647     if ( !cmd )
 648         return;
 649
 650     int code = wxShell(cmd);
 651     wxLogStatus(_T("Shell command '%s' terminated with exit code %d."),
 652                 cmd.c_str(), code);
 653     m_cmdLast = cmd;
 654 }
 655
 656 void MyFrame::OnExecWithRedirect(wxCommandEvent& WXUNUSED(event))
 657 {
 658     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 659                                      DIALOG_TITLE,
 660                                      m_cmdLast);
 661
 662     if ( !cmd )
 663         return;
 664
 665     bool sync;
 666     switch ( wxMessageBox(_T("Execute it synchronously?"),
 667                           _T("Exec question"),
 668                           wxYES_NO | wxCANCEL | wxICON_QUESTION, this) )
 669     {
 670         case wxYES:
 671             sync = TRUE;
 672             break;
 673
 674         case wxNO:
 675             sync = FALSE;
 676             break;
 677
 678         default:
 679             return;
 680     }
 681
 682     if ( sync )
 683     {
 684         wxArrayString output, errors;
 685         int code = wxExecute(cmd, output, errors);
 686         wxLogStatus(_T("command '%s' terminated with exit code %d."),
 687                     cmd.c_str(), code);
 688
 689         if ( code != -1 )
 690         {
 691             ShowOutput(cmd, output, _T("Output"));
 692             ShowOutput(cmd, errors, _T("Errors"));
 693         }
 694     }
 695     else // async exec
 696     {
 697         MyPipedProcess *process = new MyPipedProcess(this, cmd);
 698         if ( !wxExecute(cmd, wxEXEC_ASYNC, process) )
 699         {
 700             wxLogError(_T("Execution of '%s' failed."), cmd.c_str());
 701
 702             delete process;
 703         }
 704         else
 705         {
 706             AddAsyncProcess(process);
 707         }
 708     }
 709
 710     m_cmdLast = cmd;
 711 }
 712
 713 void MyFrame::OnExecWithPipe(wxCommandEvent& WXUNUSED(event))
 714 {
 715     if ( !m_cmdLast )
 716         m_cmdLast = _T("tr [a-z] [A-Z]");
 717
 718     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 719                                      DIALOG_TITLE,
 720                                      m_cmdLast);
 721
 722     if ( !cmd )
 723         return;
 724
 725     wxString input = wxGetTextFromUser(_T("Enter the string to send to it: "),
 726                                        DIALOG_TITLE);
 727     if ( !input )
 728         return;
 729
 730     // always execute the filter asynchronously
 731     MyPipedProcess2 *process = new MyPipedProcess2(this, cmd, input);
 732     long pid = wxExecute(cmd, wxEXEC_ASYNC, process);
 733     if ( pid )
 734     {
 735         wxLogStatus( _T("Process %ld (%s) launched."), pid, cmd.c_str() );
 736
 737         AddAsyncProcess(process);
 738     }
 739     else
 740     {
 741         wxLogError(_T("Execution of '%s' failed."), cmd.c_str());
 742
 743         delete process;
 744     }
 745
 746     m_cmdLast = cmd;
 747 }
 748
 749 void MyFrame::OnPOpen(wxCommandEvent& WXUNUSED(event))
 750 {
 751     wxString cmd = wxGetTextFromUser(_T("Enter the command to launch: "),
 752                                      DIALOG_TITLE,
 753                                      m_cmdLast);
 754     if ( cmd.empty() )
 755         return;
 756
 757     wxProcess *process = wxProcess::Open(cmd);
 758     if ( !process )
 759     {
 760         wxLogError(_T("Failed to launch the command."));
 761         return;
 762     }
 763
 764     wxOutputStream *out = process->GetOutputStream();
 765     if ( !out )
 766     {
 767         wxLogError(_T("Failed to connect to child stdin"));
 768         return;
 769     }
 770
 771     wxInputStream *in = process->GetInputStream();
 772     if ( !in )
 773     {
 774         wxLogError(_T("Failed to connect to child stdout"));
 775         return;
 776     }
 777
 778     new MyPipeFrame(this, cmd, process);
 779 }
 780
 781 void MyFrame::OnFileExec(wxCommandEvent& WXUNUSED(event))
 782 {
 783     static wxString s_filename;
 784
 785     wxString filename = wxLoadFileSelector(_T(""), _T(""), s_filename);
 786     if ( !filename )
 787         return;
 788
 789     s_filename = filename;
 790
 791     wxString ext = filename.AfterFirst(_T('.'));
 792     wxFileType *ft = wxTheMimeTypesManager->GetFileTypeFromExtension(ext);
 793     if ( !ft )
 794     {
 795         wxLogError(_T("Impossible to determine the file type for extension '%s'"),
 796                    ext.c_str());
 797         return;
 798     }
 799
 800     wxString cmd;
 801     bool ok = ft->GetOpenCommand(&cmd,
 802                                  wxFileType::MessageParameters(filename, _T("")));
 803     delete ft;
 804     if ( !ok )
 805     {
 806         wxLogError(_T("Impossible to find out how to open files of extension '%s'"),
 807                    ext.c_str());
 808         return;
 809     }
 810
 811     DoAsyncExec(cmd);
 812 }
 813
 814 // ----------------------------------------------------------------------------
 815 // DDE stuff
 816 // ----------------------------------------------------------------------------
 817
 818 #ifdef __WINDOWS__
 819
 820 bool MyFrame::GetDDEServer()
 821 {
 822     wxString server = wxGetTextFromUser(_T("Server to connect to:"),
 823                                         DIALOG_TITLE, m_server);
 824     if ( !server )
 825         return FALSE;
 826
 827     m_server = server;
 828
 829     wxString topic = wxGetTextFromUser(_T("DDE topic:"), DIALOG_TITLE, m_topic);
 830     if ( !topic )
 831         return FALSE;
 832
 833     m_topic = topic;
 834
 835     wxString cmd = wxGetTextFromUser(_T("DDE command:"), DIALOG_TITLE, m_cmdDde);
 836     if ( !cmd )
 837         return FALSE;
 838
 839     m_cmdDde = cmd;
 840
 841     return TRUE;
 842 }
 843
 844 void MyFrame::OnDDEExec(wxCommandEvent& WXUNUSED(event))
 845 {
 846     if ( !GetDDEServer() )
 847         return;
 848
 849     wxDDEClient client;
 850     wxConnectionBase *conn = client.MakeConnection(_T(""), m_server, m_topic);
 851     if ( !conn )
 852     {
 853         wxLogError(_T("Failed to connect to the DDE server '%s'."),
 854                    m_server.c_str());
 855     }
 856     else
 857     {
 858         if ( !conn->Execute(m_cmdDde) )
 859         {
 860             wxLogError(_T("Failed to execute command '%s' via DDE."),
 861                        m_cmdDde.c_str());
 862         }
 863         else
 864         {
 865             wxLogStatus(_T("Successfully executed DDE command"));
 866         }
 867     }
 868 }
 869
 870 void MyFrame::OnDDERequest(wxCommandEvent& WXUNUSED(event))
 871 {
 872     if ( !GetDDEServer() )
 873         return;
 874
 875     wxDDEClient client;
 876     wxConnectionBase *conn = client.MakeConnection(_T(""), m_server, m_topic);
 877     if ( !conn )
 878     {
 879         wxLogError(_T("Failed to connect to the DDE server '%s'."),
 880                    m_server.c_str());
 881     }
 882     else
 883     {
 884         if ( !conn->Request(m_cmdDde) )
 885         {
 886             wxLogError(_T("Failed to  send request '%s' via DDE."),
 887                        m_cmdDde.c_str());
 888         }
 889         else
 890         {
 891             wxLogStatus(_T("Successfully sent DDE request."));
 892         }
 893     }
 894 }
 895
 896 #endif // __WINDOWS__
 897
 898 // ----------------------------------------------------------------------------
 899 // various helpers
 900 // ----------------------------------------------------------------------------
 901
 902 // input polling
 903 void MyFrame::OnIdle(wxIdleEvent& event)
 904 {
 905     size_t count = m_running.GetCount();
 906     for ( size_t n = 0; n < count; n++ )
 907     {
 908         if ( m_running[n]->HasInput() )
 909         {
 910             event.RequestMore();
 911         }
 912     }
 913 }
 914
 915 void MyFrame::OnTimer(wxTimerEvent& WXUNUSED(event))
 916 {
 917     wxWakeUpIdle();
 918 }
 919
 920 void MyFrame::OnProcessTerminated(MyPipedProcess *process)
 921 {
 922     RemoveAsyncProcess(process);
 923 }
 924
 925
 926 void MyFrame::ShowOutput(const wxString& cmd,
 927                          const wxArrayString& output,
 928                          const wxString& title)
 929 {
 930     size_t count = output.GetCount();
 931     if ( !count )
 932         return;
 933
 934     m_lbox->Append(wxString::Format(_T("--- %s of '%s' ---"),
 935                                     title.c_str(), cmd.c_str()));
 936
 937     for ( size_t n = 0; n < count; n++ )
 938     {
 939         m_lbox->Append(output[n]);
 940     }
 941
 942     m_lbox->Append(wxString::Format(_T("--- End of %s ---"),
 943                                     title.Lower().c_str()));
 944 }
 945
 946 // ----------------------------------------------------------------------------
 947 // MyProcess
 948 // ----------------------------------------------------------------------------
 949
 950 void MyProcess::OnTerminate(int pid, int status)
 951 {
 952     wxLogStatus(m_parent, _T("Process %u ('%s') terminated with exit code %d."),
 953                 pid, m_cmd.c_str(), status);
 954
 955     // we're not needed any more
 956     delete this;
 957 }
 958
 959 // ----------------------------------------------------------------------------
 960 // MyPipedProcess
 961 // ----------------------------------------------------------------------------
 962
 963 bool MyPipedProcess::HasInput()
 964 {
 965     bool hasInput = FALSE;
 966
 967     if ( IsInputAvailable() )
 968     {
 969         wxTextInputStream tis(*GetInputStream());
 970
 971         // this assumes that the output is always line buffered
 972         wxString msg;
 973         msg << m_cmd << _T(" (stdout): ") << tis.ReadLine();
 974
 975         m_parent->GetLogListBox()->Append(msg);
 976
 977         hasInput = TRUE;
 978     }
 979
 980     if ( IsErrorAvailable() )
 981     {
 982         wxTextInputStream tis(*GetErrorStream());
 983
 984         // this assumes that the output is always line buffered
 985         wxString msg;
 986         msg << m_cmd << _T(" (stderr): ") << tis.ReadLine();
 987
 988         m_parent->GetLogListBox()->Append(msg);
 989
 990         hasInput = TRUE;
 991     }
 992
 993     return hasInput;
 994 }
 995
 996 void MyPipedProcess::OnTerminate(int pid, int status)
 997 {
 998     // show the rest of the output
 999     while ( HasInput() )
1000         ;
1001
1002     m_parent->OnProcessTerminated(this);
1003
1004     MyProcess::OnTerminate(pid, status);
1005 }
1006
1007 // ----------------------------------------------------------------------------
1008 // MyPipedProcess2
1009 // ----------------------------------------------------------------------------
1010
1011 bool MyPipedProcess2::HasInput()
1012 {
1013     if ( !!m_input )
1014     {
1015         wxTextOutputStream os(*GetOutputStream());
1016         os.WriteString(m_input);
1017
1018         CloseOutput();
1019         m_input.clear();
1020
1021         // call us once again - may be we'll have output
1022         return TRUE;
1023     }
1024
1025     return MyPipedProcess::HasInput();
1026 }
1027
1028 // ============================================================================
1029 // MyPipeFrame implementation
1030 // ============================================================================
1031
1032 MyPipeFrame::MyPipeFrame(wxFrame *parent,
1033                          const wxString& cmd,
1034                          wxProcess *process)
1035            : wxFrame(parent, -1, cmd),
1036              m_process(process),
1037              // in a real program we'd check that the streams are !NULL here
1038              m_in(*process->GetInputStream()),
1039              m_out(*process->GetOutputStream())
1040 {
1041     m_process->SetNextHandler(this);
1042
1043     wxPanel *panel = new wxPanel(this, -1);
1044
1045     m_textIn = new wxTextCtrl(panel, -1, _T(""),
1046                               wxDefaultPosition, wxDefaultSize,
1047                               wxTE_PROCESS_ENTER);
1048     m_textOut = new wxTextCtrl(panel, -1, _T(""));
1049     m_textOut->SetEditable(FALSE);
1050
1051     wxSizer *sizerTop = new wxBoxSizer(wxVERTICAL);
1052     sizerTop->Add(m_textIn, 0, wxGROW | wxALL, 5);
1053
1054     wxSizer *sizerBtns = new wxBoxSizer(wxHORIZONTAL);
1055     sizerBtns->Add(new wxButton(panel, Exec_Btn_Send, _T("&Send")), 0,
1056                    wxALL, 10);
1057     sizerBtns->Add(new wxButton(panel, Exec_Btn_Get, _T("&Get")), 0,
1058                    wxALL, 10);
1059
1060     sizerTop->Add(sizerBtns, 0, wxCENTRE | wxALL, 5);
1061     sizerTop->Add(m_textOut, 0, wxGROW | wxALL, 5);
1062
1063     panel->SetSizer(sizerTop);
1064     sizerTop->Fit(this);
1065
1066     Show();
1067 }
1068
1069 void MyPipeFrame::DoGet()
1070 {
1071     // we don't have any way to be notified when any input appears on the
1072     // stream so we have to poll it :-(
1073     //
1074     // NB: this really must be done because otherwise the other program might
1075     //     not have enough time to receive or process our data and we'd read
1076     //     an empty string
1077     while ( !m_process->IsInputAvailable() && m_process->IsInputOpened() )
1078         ;
1079
1080     m_textOut->SetValue(m_in.ReadLine());
1081 }
1082
1083 void MyPipeFrame::OnClose(wxCloseEvent& event)
1084 {
1085     if ( m_process )
1086     {
1087         // we're not interested in getting the process termination notification
1088         // if we are closing it ourselves
1089         wxProcess *process = m_process;
1090         m_process = NULL;
1091         process->SetNextHandler(NULL);
1092
1093         process->CloseOutput();
1094     }
1095
1096     event.Skip();
1097 }
1098
1099 void MyPipeFrame::OnProcessTerm(wxProcessEvent& WXUNUSED(event))
1100 {
1101     delete m_process;
1102     m_process = NULL;
1103
1104     wxLogWarning(_T("The other process has terminated, closing"));
1105
1106     Close();
1107 }