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" wxWidgets 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 #include "wx/numdlg.h"
  59
  60 #include "wx/process.h"
  61
  62 #include "wx/mimetype.h"
  63
  64 #ifdef __WINDOWS__
  65     #include "wx/dde.h"
  66 #endif // __WINDOWS__
  67
  68 // ----------------------------------------------------------------------------
  69 // the usual application and main frame classes
  70 // ----------------------------------------------------------------------------
  71
  72 // Define a new application type, each program should derive a class from wxApp
  73 class MyApp : public wxApp
  74 {
  75 public:
  76     // override base class virtuals
  77     // ----------------------------
  78
  79     // this one is called on application startup and is a good place for the app
  80     // initialization (doing it here and not in the ctor allows to have an error
  81     // return: if OnInit() returns false, the application terminates)
  82     virtual bool OnInit();
  83 };
  84
  85 // Define an array of process pointers used by MyFrame
  86 class MyPipedProcess;
  87 WX_DEFINE_ARRAY_PTR(MyPipedProcess *, MyProcessesArray);
  88
  89 // Define a new frame type: this is going to be our main frame
  90 class MyFrame : public wxFrame
  91 {
  92 public:
  93     // ctor(s)
  94     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  95
  96     // event handlers (these functions should _not_ be virtual)
  97     void OnQuit(wxCommandEvent& event);
  98
  99     void OnKill(wxCommandEvent& event);
 100
 101     void OnClear(wxCommandEvent& event);
 102
 103     void OnSyncExec(wxCommandEvent& event);
 104     void OnAsyncExec(wxCommandEvent& event);
 105     void OnShell(wxCommandEvent& event);
 106     void OnExecWithRedirect(wxCommandEvent& event);
 107     void OnExecWithPipe(wxCommandEvent& event);
 108
 109     void OnPOpen(wxCommandEvent& event);
 110
 111     void OnFileExec(wxCommandEvent& event);
 112
 113     void OnAbout(wxCommandEvent& event);
 114
 115     // polling output of async processes
 116     void OnTimer(wxTimerEvent& event);
 117     void OnIdle(wxIdleEvent& event);
 118
 119     // for MyPipedProcess
 120     void OnProcessTerminated(MyPipedProcess *process);
 121     wxListBox *GetLogListBox() const { return m_lbox; }
 122
 123 private:
 124     void ShowOutput(const wxString& cmd,
 125                     const wxArrayString& output,
 126                     const wxString& title);
 127
 128     void DoAsyncExec(const wxString& cmd);
 129
 130     void AddAsyncProcess(MyPipedProcess *process)
 131     {
 132         if ( m_running.IsEmpty() )
 133         {
 134             // we want to start getting the timer events to ensure that a
 135             // steady stream of idle events comes in -- otherwise we
 136             // wouldn't be able to poll the child process input
 137             m_timerIdleWakeUp.Start(100);
 138         }
 139         //else: the timer is already running
 140
 141         m_running.Add(process);
 142     }
 143
 144     void RemoveAsyncProcess(MyPipedProcess *process)
 145     {
 146         m_running.Remove(process);
 147
 148         if ( m_running.IsEmpty() )
 149         {
 150             // we don't need to get idle events all the time any more
 151             m_timerIdleWakeUp.Stop();
 152         }
 153     }
 154
 155     // the PID of the last process we launched asynchronously
 156     long m_pidLast;
 157
 158     // last command we executed
 159     wxString m_cmdLast;
 160
 161 #ifdef __WINDOWS__
 162     void OnDDEExec(wxCommandEvent& event);
 163     void OnDDERequest(wxCommandEvent& event);
 164
 165     bool GetDDEServer();
 166
 167     // last params of a DDE transaction
 168     wxString m_server,
 169              m_topic,
 170              m_cmdDde;
 171 #endif // __WINDOWS__
 172
 173     wxListBox *m_lbox;
 174
 175     MyProcessesArray m_running;
 176
 177     // the idle event wake up timer
 178     wxTimer m_timerIdleWakeUp;
 179
 180     // any class wishing to process wxWidgets events must use this macro
 181     DECLARE_EVENT_TABLE()
 182 };
 183
 184 // ----------------------------------------------------------------------------
 185 // MyPipeFrame: allows the user to communicate with the child process
 186 // ----------------------------------------------------------------------------
 187
 188 class MyPipeFrame : public wxFrame
 189 {
 190 public:
 191     MyPipeFrame(wxFrame *parent,
 192                 const wxString& cmd,
 193                 wxProcess *process);
 194
 195 protected:
 196     void OnTextEnter(wxCommandEvent& WXUNUSED(event)) { DoSend(); }
 197     void OnBtnSend(wxCommandEvent& WXUNUSED(event)) { DoSend(); }
 198     void OnBtnGet(wxCommandEvent& WXUNUSED(event)) { DoGet(); }
 199
 200     void OnClose(wxCloseEvent& event);
 201
 202     void OnProcessTerm(wxProcessEvent& event);
 203
 204     void DoSend()
 205     {
 206         m_out.WriteString(m_textIn->GetValue() + _T('\n'));
 207         m_textIn->Clear();
 208
 209         DoGet();
 210     }
 211
 212     void DoGet();
 213
 214 private:
 215     wxProcess *m_process;
 216
 217     wxTextInputStream m_in;
 218     wxTextOutputStream m_out;
 219
 220     wxTextCtrl *m_textIn,
 221                *m_textOut;
 222
 223     DECLARE_EVENT_TABLE()
 224 };
 225
 226 // ----------------------------------------------------------------------------
 227 // wxProcess-derived classes
 228 // ----------------------------------------------------------------------------
 229
 230 // This is the handler for process termination events
 231 class MyProcess : public wxProcess
 232 {
 233 public:
 234     MyProcess(MyFrame *parent, const wxString& cmd)
 235         : wxProcess(parent), m_cmd(cmd)
 236     {
 237         m_parent = parent;
 238     }
 239
 240     // instead of overriding this virtual function we might as well process the
 241     // event from it in the frame class - this might be more convenient in some
 242     // cases
 243     virtual void OnTerminate(int pid, int status);
 244
 245 protected:
 246     MyFrame *m_parent;
 247     wxString m_cmd;
 248 };
 249
 250 // A specialization of MyProcess for redirecting the output
 251 class MyPipedProcess : public MyProcess
 252 {
 253 public:
 254     MyPipedProcess(MyFrame *parent, const wxString& cmd)
 255         : MyProcess(parent, cmd)
 256         {
 257             Redirect();
 258         }
 259
 260     virtual void OnTerminate(int pid, int status);
 261
 262     virtual bool HasInput();
 263 };
 264
 265 // A version of MyPipedProcess which also sends input to the stdin of the
 266 // child process
 267 class MyPipedProcess2 : public MyPipedProcess
 268 {
 269 public:
 270     MyPipedProcess2(MyFrame *parent, const wxString& cmd, const wxString& input)
 271         : MyPipedProcess(parent, cmd), m_input(input)
 272         {
 273         }
 274
 275     virtual bool HasInput();
 276
 277 private:
 278     wxString m_input;
 279 };
 280
 281 // ----------------------------------------------------------------------------
 282 // constants
 283 // ----------------------------------------------------------------------------
 284
 285 // IDs for the controls and the menu commands
 286 enum
 287 {
 288     // menu items
 289     Exec_Quit = 100,
 290     Exec_Kill,
 291     Exec_ClearLog,
 292     Exec_SyncExec = 200,
 293     Exec_AsyncExec,
 294     Exec_Shell,
 295     Exec_POpen,
 296     Exec_OpenFile,
 297     Exec_DDEExec,
 298     Exec_DDERequest,
 299     Exec_Redirect,
 300     Exec_Pipe,
 301     Exec_About = 300,
 302
 303     // control ids
 304     Exec_Btn_Send = 1000,
 305     Exec_Btn_Get
 306 };
 307
 308 static const wxChar *DIALOG_TITLE = _T("Exec sample");
 309
 310 // ----------------------------------------------------------------------------
 311 // event tables and other macros for wxWidgets
 312 // ----------------------------------------------------------------------------
 313
 314 // the event tables connect the wxWidgets events with the functions (event
 315 // handlers) which process them. It can be also done at run-time, but for the
 316 // simple menu events like this the static method is much simpler.
 317 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 318     EVT_MENU(Exec_Quit,  MyFrame::OnQuit)
 319     EVT_MENU(Exec_Kill,  MyFrame::OnKill)
 320     EVT_MENU(Exec_ClearLog,  MyFrame::OnClear)
 321
 322     EVT_MENU(Exec_SyncExec, MyFrame::OnSyncExec)
 323     EVT_MENU(Exec_AsyncExec, MyFrame::OnAsyncExec)
 324     EVT_MENU(Exec_Shell, MyFrame::OnShell)
 325     EVT_MENU(Exec_Redirect, MyFrame::OnExecWithRedirect)
 326     EVT_MENU(Exec_Pipe, MyFrame::OnExecWithPipe)
 327
 328     EVT_MENU(Exec_POpen, MyFrame::OnPOpen)
 329
 330     EVT_MENU(Exec_OpenFile, MyFrame::OnFileExec)
 331
 332 #ifdef __WINDOWS__
 333     EVT_MENU(Exec_DDEExec, MyFrame::OnDDEExec)
 334     EVT_MENU(Exec_DDERequest, MyFrame::OnDDERequest)
 335 #endif // __WINDOWS__
 336
 337     EVT_MENU(Exec_About, MyFrame::OnAbout)
 338
 339     EVT_IDLE(MyFrame::OnIdle)
 340
 341     EVT_TIMER(-1, MyFrame::OnTimer)
 342 END_EVENT_TABLE()
 343
 344 BEGIN_EVENT_TABLE(MyPipeFrame, wxFrame)
 345     EVT_BUTTON(Exec_Btn_Send, MyPipeFrame::OnBtnSend)
 346     EVT_BUTTON(Exec_Btn_Get, MyPipeFrame::OnBtnGet)
 347
 348     EVT_TEXT_ENTER(-1, MyPipeFrame::OnTextEnter)
 349
 350     EVT_CLOSE(MyPipeFrame::OnClose)
 351
 352     EVT_END_PROCESS(-1, MyPipeFrame::OnProcessTerm)
 353 END_EVENT_TABLE()
 354
 355 // Create a new application object: this macro will allow wxWidgets to create
 356 // the application object during program execution (it's better than using a
 357 // static object for many reasons) and also declares the accessor function
 358 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 359 // not wxApp)
 360 IMPLEMENT_APP(MyApp)
 361
 362 // ============================================================================
 363 // implementation
 364 // ============================================================================
 365
 366 // ----------------------------------------------------------------------------
 367 // the application class
 368 // ----------------------------------------------------------------------------
 369
 370 // `Main program' equivalent: the program execution "starts" here
 371 bool MyApp::OnInit()
 372 {
 373     // Create the main application window
 374     MyFrame *frame = new MyFrame(_T("Exec wxWidgets sample"),
 375                                  wxDefaultPosition, wxSize(500, 140));
 376
 377     // Show it and tell the application that it's our main window
 378     frame->Show(TRUE);
 379     SetTopWindow(frame);
 380
 381     // success: wxApp::OnRun() will be called which will enter the main message
 382     // loop and the application will run. If we returned FALSE here, the
 383     // application would exit immediately.
 384     return TRUE;
 385 }
 386
 387 // ----------------------------------------------------------------------------
 388 // main frame
 389 // ----------------------------------------------------------------------------
 390
 391 #ifdef __VISUALC__
 392 #pragma warning(disable: 4355) // this used in base member initializer list
 393 #endif
 394
 395 // frame constructor
 396 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 397        : wxFrame((wxFrame *)NULL, -1, title, pos, size),
 398          m_timerIdleWakeUp(this)
 399 {
 400     m_pidLast = 0;
 401
 402 #ifdef __WXMAC__
 403     // we need this in order to allow the about menu relocation, since ABOUT is
 404     // not the default id of the about menu
 405     wxApp::s_macAboutMenuItemId = Exec_About;
 406 #endif
 407
 408     // create a menu bar
 409     wxMenu *menuFile = new wxMenu(_T(""), wxMENU_TEAROFF);
 410     menuFile->Append(Exec_Kill, _T("&Kill process...\tCtrl-K"),
 411                      _T("Kill a process by PID"));
 412     menuFile->AppendSeparator();
 413     menuFile->Append(Exec_ClearLog, _T("&Clear log\tCtrl-C"),
 414                      _T("Clear the log window"));
 415     menuFile->AppendSeparator();
 416     menuFile->Append(Exec_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
 417
 418     wxMenu *execMenu = new wxMenu;
 419     execMenu->Append(Exec_SyncExec, _T("Sync &execution...\tCtrl-E"),
 420                      _T("Launch a program and return when it terminates"));
 421     execMenu->Append(Exec_AsyncExec, _T("&Async execution...\tCtrl-A"),
 422                      _T("Launch a program and return immediately"));
 423     execMenu->Append(Exec_Shell, _T("Execute &shell command...\tCtrl-S"),
 424                      _T("Launch a shell and execute a command in it"));
 425     execMenu->AppendSeparator();
 426     execMenu->Append(Exec_Redirect, _T("Capture command &output...\tCtrl-O"),
 427                      _T("Launch a program and capture its output"));
 428     execMenu->Append(Exec_Pipe, _T("&Pipe through command..."),
 429                      _T("Pipe a string through a filter"));
 430     execMenu->Append(Exec_POpen, _T("&Open a pipe to a command...\tCtrl-P"),
 431                      _T("Open a pipe to and from another program"));
 432
 433     execMenu->AppendSeparator();
 434     execMenu->Append(Exec_OpenFile, _T("Open &file...\tCtrl-F"),
 435                      _T("Launch the command to open this kind of files"));
 436 #ifdef __WINDOWS__
 437     execMenu->AppendSeparator();
 438     execMenu->Append(Exec_DDEExec, _T("Execute command via &DDE...\tCtrl-D"));
 439     execMenu->Append(Exec_DDERequest, _T("Send DDE &request...\tCtrl-R"));
 440 #endif
 441
 442     wxMenu *helpMenu = new wxMenu(_T(""), wxMENU_TEAROFF);
 443     helpMenu->Append(Exec_About, _T("&About...\tF1"), _T("Show about dialog"));
 444
 445     // now append the freshly created menu to the menu bar...
 446     wxMenuBar *menuBar = new wxMenuBar();
 447     menuBar->Append(menuFile, _T("&File"));
 448     menuBar->Append(execMenu, _T("&Exec"));
 449     menuBar->Append(helpMenu, _T("&Help"));
 450
 451     // ... and attach this menu bar to the frame
 452     SetMenuBar(menuBar);
 453
 454     // create the listbox in which we will show misc messages as they come
 455     m_lbox = new wxListBox(this, -1);
 456     wxFont font(12, wxFONTFAMILY_TELETYPE, wxFONTSTYLE_NORMAL,
 457                 wxFONTWEIGHT_NORMAL);
 458     if ( font.Ok() )
 459         m_lbox->SetFont(font);
 460
 461 #if wxUSE_STATUSBAR
 462     // create a status bar just for fun (by default with 1 pane only)
 463     CreateStatusBar();
 464     SetStatusText(_T("Welcome to wxWidgets exec sample!"));
 465 #endif // wxUSE_STATUSBAR
 466 }
 467
 468 // ----------------------------------------------------------------------------
 469 // event handlers: file and help menu
 470 // ----------------------------------------------------------------------------
 471
 472 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 473 {
 474     // TRUE is to force the frame to close
 475     Close(TRUE);
 476 }
 477
 478 void MyFrame::OnClear(wxCommandEvent& WXUNUSED(event))
 479 {
 480     m_lbox->Clear();
 481 }
 482
 483 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 484 {
 485     wxMessageBox(_T("Exec wxWidgets Sample\n© 2000-2002 Vadim Zeitlin"),
 486                  _T("About Exec"), wxOK | wxICON_INFORMATION, this);
 487 }
 488
 489 void MyFrame::OnKill(wxCommandEvent& WXUNUSED(event))
 490 {
 491     long pid = wxGetNumberFromUser(_T("Please specify the process to kill"),
 492                                    _T("Enter PID:"),
 493                                    _T("Exec question"),
 494                                    m_pidLast,
 495                                    // we need the full unsigned int range
 496                                    -INT_MAX, INT_MAX,
 497                                    this);
 498     if ( pid == -1 )
 499     {
 500         // cancelled
 501         return;
 502     }
 503
 504     static const wxString signalNames[] =
 505     {
 506         _T("Just test (SIGNONE)"),
 507         _T("Hangup (SIGHUP)"),
 508         _T("Interrupt (SIGINT)"),
 509         _T("Quit (SIGQUIT)"),
 510         _T("Illegal instruction (SIGILL)"),
 511         _T("Trap (SIGTRAP)"),
 512         _T("Abort (SIGABRT)"),
 513         _T("Emulated trap (SIGEMT)"),
 514         _T("FP exception (SIGFPE)"),
 515         _T("Kill (SIGKILL)"),
 516         _T("Bus (SIGBUS)"),
 517         _T("Segment violation (SIGSEGV)"),
 518         _T("System (SIGSYS)"),
 519         _T("Broken pipe (SIGPIPE)"),
 520         _T("Alarm (SIGALRM)"),
 521         _T("Terminate (SIGTERM)"),
 522     };
 523
 524     int sig = wxGetSingleChoiceIndex(_T("How to kill the process?"),
 525                                      _T("Exec question"),
 526                                      WXSIZEOF(signalNames), signalNames,
 527                                      this);
 528     switch ( sig )
 529     {
 530         default:
 531             wxFAIL_MSG( _T("unexpected return value") );
 532             // fall through
 533
 534         case -1:
 535             // cancelled
 536             return;
 537
 538         case wxSIGNONE:
 539         case wxSIGHUP:
 540         case wxSIGINT:
 541         case wxSIGQUIT:
 542         case wxSIGILL:
 543         case wxSIGTRAP:
 544         case wxSIGABRT:
 545         case wxSIGEMT:
 546         case wxSIGFPE:
 547         case wxSIGKILL:
 548         case wxSIGBUS:
 549         case wxSIGSEGV:
 550         case wxSIGSYS:
 551         case wxSIGPIPE:
 552         case wxSIGALRM:
 553         case wxSIGTERM:
 554             break;
 555     }
 556
 557     if ( sig == 0 )
 558     {
 559         if ( wxProcess::Exists(pid) )
 560             wxLogStatus(_T("Process %ld is running."), pid);
 561         else
 562             wxLogStatus(_T("No process with pid = %ld."), pid);
 563     }
 564     else // not SIGNONE
 565     {
 566         wxKillError rc = wxProcess::Kill(pid, (wxSignal)sig);
 567         if ( rc == wxKILL_OK )
 568         {
 569             wxLogStatus(_T("Process %ld killed with signal %d."), pid, sig);
 570         }
 571         else
 572         {
 573             static const wxChar *errorText[] =
 574             {
 575                 _T(""), // no error
 576                 _T("signal not supported"),
 577                 _T("permission denied"),
 578                 _T("no such process"),
 579                 _T("unspecified error"),
 580             };
 581
 582             wxLogStatus(_T("Failed to kill process %ld with signal %d: %s"),
 583                         pid, sig, errorText[rc]);
 584         }
 585     }
 586 }
 587
 588 // ----------------------------------------------------------------------------
 589 // event handlers: exec menu
 590 // ----------------------------------------------------------------------------
 591
 592 void MyFrame::DoAsyncExec(const wxString& cmd)
 593 {
 594     wxProcess *process = new MyProcess(this, cmd);
 595     m_pidLast = wxExecute(cmd, wxEXEC_ASYNC, process);
 596     if ( !m_pidLast )
 597     {
 598         wxLogError( _T("Execution of '%s' failed."), cmd.c_str() );
 599
 600         delete process;
 601     }
 602     else
 603     {
 604         wxLogStatus( _T("Process %ld (%s) launched."),
 605             m_pidLast, cmd.c_str() );
 606
 607         m_cmdLast = cmd;
 608     }
 609 }
 610
 611 void MyFrame::OnSyncExec(wxCommandEvent& WXUNUSED(event))
 612 {
 613     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 614                                      DIALOG_TITLE,
 615                                      m_cmdLast);
 616
 617     if ( !cmd )
 618         return;
 619
 620     wxLogStatus( _T("'%s' is running please wait..."), cmd.c_str() );
 621
 622     int code = wxExecute(cmd, wxEXEC_SYNC);
 623
 624     wxLogStatus(_T("Process '%s' terminated with exit code %d."),
 625         cmd.c_str(), code);
 626
 627     m_cmdLast = cmd;
 628 }
 629
 630 void MyFrame::OnAsyncExec(wxCommandEvent& WXUNUSED(event))
 631 {
 632     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 633                                      DIALOG_TITLE,
 634                                      m_cmdLast);
 635
 636     if ( !cmd )
 637         return;
 638
 639     DoAsyncExec(cmd);
 640 }
 641
 642 void MyFrame::OnShell(wxCommandEvent& WXUNUSED(event))
 643 {
 644     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 645                                      DIALOG_TITLE,
 646                                      m_cmdLast);
 647
 648     if ( !cmd )
 649         return;
 650
 651     int code = wxShell(cmd);
 652     wxLogStatus(_T("Shell command '%s' terminated with exit code %d."),
 653                 cmd.c_str(), code);
 654     m_cmdLast = cmd;
 655 }
 656
 657 void MyFrame::OnExecWithRedirect(wxCommandEvent& WXUNUSED(event))
 658 {
 659     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 660                                      DIALOG_TITLE,
 661                                      m_cmdLast);
 662
 663     if ( !cmd )
 664         return;
 665
 666     bool sync;
 667     switch ( wxMessageBox(_T("Execute it synchronously?"),
 668                           _T("Exec question"),
 669                           wxYES_NO | wxCANCEL | wxICON_QUESTION, this) )
 670     {
 671         case wxYES:
 672             sync = TRUE;
 673             break;
 674
 675         case wxNO:
 676             sync = FALSE;
 677             break;
 678
 679         default:
 680             return;
 681     }
 682
 683     if ( sync )
 684     {
 685         wxArrayString output, errors;
 686         int code = wxExecute(cmd, output, errors);
 687         wxLogStatus(_T("command '%s' terminated with exit code %d."),
 688                     cmd.c_str(), code);
 689
 690         if ( code != -1 )
 691         {
 692             ShowOutput(cmd, output, _T("Output"));
 693             ShowOutput(cmd, errors, _T("Errors"));
 694         }
 695     }
 696     else // async exec
 697     {
 698         MyPipedProcess *process = new MyPipedProcess(this, cmd);
 699         if ( !wxExecute(cmd, wxEXEC_ASYNC, process) )
 700         {
 701             wxLogError(_T("Execution of '%s' failed."), cmd.c_str());
 702
 703             delete process;
 704         }
 705         else
 706         {
 707             AddAsyncProcess(process);
 708         }
 709     }
 710
 711     m_cmdLast = cmd;
 712 }
 713
 714 void MyFrame::OnExecWithPipe(wxCommandEvent& WXUNUSED(event))
 715 {
 716     if ( !m_cmdLast )
 717         m_cmdLast = _T("tr [a-z] [A-Z]");
 718
 719     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 720                                      DIALOG_TITLE,
 721                                      m_cmdLast);
 722
 723     if ( !cmd )
 724         return;
 725
 726     wxString input = wxGetTextFromUser(_T("Enter the string to send to it: "),
 727                                        DIALOG_TITLE);
 728     if ( !input )
 729         return;
 730
 731     // always execute the filter asynchronously
 732     MyPipedProcess2 *process = new MyPipedProcess2(this, cmd, input);
 733     long pid = wxExecute(cmd, wxEXEC_ASYNC, process);
 734     if ( pid )
 735     {
 736         wxLogStatus( _T("Process %ld (%s) launched."), pid, cmd.c_str() );
 737
 738         AddAsyncProcess(process);
 739     }
 740     else
 741     {
 742         wxLogError(_T("Execution of '%s' failed."), cmd.c_str());
 743
 744         delete process;
 745     }
 746
 747     m_cmdLast = cmd;
 748 }
 749
 750 void MyFrame::OnPOpen(wxCommandEvent& WXUNUSED(event))
 751 {
 752     wxString cmd = wxGetTextFromUser(_T("Enter the command to launch: "),
 753                                      DIALOG_TITLE,
 754                                      m_cmdLast);
 755     if ( cmd.empty() )
 756         return;
 757
 758     wxProcess *process = wxProcess::Open(cmd);
 759     if ( !process )
 760     {
 761         wxLogError(_T("Failed to launch the command."));
 762         return;
 763     }
 764
 765     wxOutputStream *out = process->GetOutputStream();
 766     if ( !out )
 767     {
 768         wxLogError(_T("Failed to connect to child stdin"));
 769         return;
 770     }
 771
 772     wxInputStream *in = process->GetInputStream();
 773     if ( !in )
 774     {
 775         wxLogError(_T("Failed to connect to child stdout"));
 776         return;
 777     }
 778
 779     new MyPipeFrame(this, cmd, process);
 780 }
 781
 782 void MyFrame::OnFileExec(wxCommandEvent& WXUNUSED(event))
 783 {
 784     static wxString s_filename;
 785
 786     wxString filename = wxLoadFileSelector(_T(""), _T(""), s_filename);
 787     if ( !filename )
 788         return;
 789
 790     s_filename = filename;
 791
 792     wxString ext = filename.AfterFirst(_T('.'));
 793     wxFileType *ft = wxTheMimeTypesManager->GetFileTypeFromExtension(ext);
 794     if ( !ft )
 795     {
 796         wxLogError(_T("Impossible to determine the file type for extension '%s'"),
 797                    ext.c_str());
 798         return;
 799     }
 800
 801     wxString cmd;
 802     bool ok = ft->GetOpenCommand(&cmd,
 803                                  wxFileType::MessageParameters(filename, _T("")));
 804     delete ft;
 805     if ( !ok )
 806     {
 807         wxLogError(_T("Impossible to find out how to open files of extension '%s'"),
 808                    ext.c_str());
 809         return;
 810     }
 811
 812     DoAsyncExec(cmd);
 813 }
 814
 815 // ----------------------------------------------------------------------------
 816 // DDE stuff
 817 // ----------------------------------------------------------------------------
 818
 819 #ifdef __WINDOWS__
 820
 821 bool MyFrame::GetDDEServer()
 822 {
 823     wxString server = wxGetTextFromUser(_T("Server to connect to:"),
 824                                         DIALOG_TITLE, m_server);
 825     if ( !server )
 826         return FALSE;
 827
 828     m_server = server;
 829
 830     wxString topic = wxGetTextFromUser(_T("DDE topic:"), DIALOG_TITLE, m_topic);
 831     if ( !topic )
 832         return FALSE;
 833
 834     m_topic = topic;
 835
 836     wxString cmd = wxGetTextFromUser(_T("DDE command:"), DIALOG_TITLE, m_cmdDde);
 837     if ( !cmd )
 838         return FALSE;
 839
 840     m_cmdDde = cmd;
 841
 842     return TRUE;
 843 }
 844
 845 void MyFrame::OnDDEExec(wxCommandEvent& WXUNUSED(event))
 846 {
 847     if ( !GetDDEServer() )
 848         return;
 849
 850     wxDDEClient client;
 851     wxConnectionBase *conn = client.MakeConnection(_T(""), m_server, m_topic);
 852     if ( !conn )
 853     {
 854         wxLogError(_T("Failed to connect to the DDE server '%s'."),
 855                    m_server.c_str());
 856     }
 857     else
 858     {
 859         if ( !conn->Execute(m_cmdDde) )
 860         {
 861             wxLogError(_T("Failed to execute command '%s' via DDE."),
 862                        m_cmdDde.c_str());
 863         }
 864         else
 865         {
 866             wxLogStatus(_T("Successfully executed DDE command"));
 867         }
 868     }
 869 }
 870
 871 void MyFrame::OnDDERequest(wxCommandEvent& WXUNUSED(event))
 872 {
 873     if ( !GetDDEServer() )
 874         return;
 875
 876     wxDDEClient client;
 877     wxConnectionBase *conn = client.MakeConnection(_T(""), m_server, m_topic);
 878     if ( !conn )
 879     {
 880         wxLogError(_T("Failed to connect to the DDE server '%s'."),
 881                    m_server.c_str());
 882     }
 883     else
 884     {
 885         if ( !conn->Request(m_cmdDde) )
 886         {
 887             wxLogError(_T("Failed to  send request '%s' via DDE."),
 888                        m_cmdDde.c_str());
 889         }
 890         else
 891         {
 892             wxLogStatus(_T("Successfully sent DDE request."));
 893         }
 894     }
 895 }
 896
 897 #endif // __WINDOWS__
 898
 899 // ----------------------------------------------------------------------------
 900 // various helpers
 901 // ----------------------------------------------------------------------------
 902
 903 // input polling
 904 void MyFrame::OnIdle(wxIdleEvent& event)
 905 {
 906     size_t count = m_running.GetCount();
 907     for ( size_t n = 0; n < count; n++ )
 908     {
 909         if ( m_running[n]->HasInput() )
 910         {
 911             event.RequestMore();
 912         }
 913     }
 914 }
 915
 916 void MyFrame::OnTimer(wxTimerEvent& WXUNUSED(event))
 917 {
 918     wxWakeUpIdle();
 919 }
 920
 921 void MyFrame::OnProcessTerminated(MyPipedProcess *process)
 922 {
 923     RemoveAsyncProcess(process);
 924 }
 925
 926
 927 void MyFrame::ShowOutput(const wxString& cmd,
 928                          const wxArrayString& output,
 929                          const wxString& title)
 930 {
 931     size_t count = output.GetCount();
 932     if ( !count )
 933         return;
 934
 935     m_lbox->Append(wxString::Format(_T("--- %s of '%s' ---"),
 936                                     title.c_str(), cmd.c_str()));
 937
 938     for ( size_t n = 0; n < count; n++ )
 939     {
 940         m_lbox->Append(output[n]);
 941     }
 942
 943     m_lbox->Append(wxString::Format(_T("--- End of %s ---"),
 944                                     title.Lower().c_str()));
 945 }
 946
 947 // ----------------------------------------------------------------------------
 948 // MyProcess
 949 // ----------------------------------------------------------------------------
 950
 951 void MyProcess::OnTerminate(int pid, int status)
 952 {
 953     wxLogStatus(m_parent, _T("Process %u ('%s') terminated with exit code %d."),
 954                 pid, m_cmd.c_str(), status);
 955
 956     // we're not needed any more
 957     delete this;
 958 }
 959
 960 // ----------------------------------------------------------------------------
 961 // MyPipedProcess
 962 // ----------------------------------------------------------------------------
 963
 964 bool MyPipedProcess::HasInput()
 965 {
 966     bool hasInput = FALSE;
 967
 968     if ( IsInputAvailable() )
 969     {
 970         wxTextInputStream tis(*GetInputStream());
 971
 972         // this assumes that the output is always line buffered
 973         wxString msg;
 974         msg << m_cmd << _T(" (stdout): ") << tis.ReadLine();
 975
 976         m_parent->GetLogListBox()->Append(msg);
 977
 978         hasInput = TRUE;
 979     }
 980
 981     if ( IsErrorAvailable() )
 982     {
 983         wxTextInputStream tis(*GetErrorStream());
 984
 985         // this assumes that the output is always line buffered
 986         wxString msg;
 987         msg << m_cmd << _T(" (stderr): ") << tis.ReadLine();
 988
 989         m_parent->GetLogListBox()->Append(msg);
 990
 991         hasInput = TRUE;
 992     }
 993
 994     return hasInput;
 995 }
 996
 997 void MyPipedProcess::OnTerminate(int pid, int status)
 998 {
 999     // show the rest of the output
1000     while ( HasInput() )
1001         ;
1002
1003     m_parent->OnProcessTerminated(this);
1004
1005     MyProcess::OnTerminate(pid, status);
1006 }
1007
1008 // ----------------------------------------------------------------------------
1009 // MyPipedProcess2
1010 // ----------------------------------------------------------------------------
1011
1012 bool MyPipedProcess2::HasInput()
1013 {
1014     if ( !!m_input )
1015     {
1016         wxTextOutputStream os(*GetOutputStream());
1017         os.WriteString(m_input);
1018
1019         CloseOutput();
1020         m_input.clear();
1021
1022         // call us once again - may be we'll have output
1023         return TRUE;
1024     }
1025
1026     return MyPipedProcess::HasInput();
1027 }
1028
1029 // ============================================================================
1030 // MyPipeFrame implementation
1031 // ============================================================================
1032
1033 MyPipeFrame::MyPipeFrame(wxFrame *parent,
1034                          const wxString& cmd,
1035                          wxProcess *process)
1036            : wxFrame(parent, -1, cmd),
1037              m_process(process),
1038              // in a real program we'd check that the streams are !NULL here
1039              m_in(*process->GetInputStream()),
1040              m_out(*process->GetOutputStream())
1041 {
1042     m_process->SetNextHandler(this);
1043
1044     wxPanel *panel = new wxPanel(this, -1);
1045
1046     m_textIn = new wxTextCtrl(panel, -1, _T(""),
1047                               wxDefaultPosition, wxDefaultSize,
1048                               wxTE_PROCESS_ENTER);
1049     m_textOut = new wxTextCtrl(panel, -1, _T(""));
1050     m_textOut->SetEditable(FALSE);
1051
1052     wxSizer *sizerTop = new wxBoxSizer(wxVERTICAL);
1053     sizerTop->Add(m_textIn, 0, wxGROW | wxALL, 5);
1054
1055     wxSizer *sizerBtns = new wxBoxSizer(wxHORIZONTAL);
1056     sizerBtns->Add(new wxButton(panel, Exec_Btn_Send, _T("&Send")), 0,
1057                    wxALL, 10);
1058     sizerBtns->Add(new wxButton(panel, Exec_Btn_Get, _T("&Get")), 0,
1059                    wxALL, 10);
1060
1061     sizerTop->Add(sizerBtns, 0, wxCENTRE | wxALL, 5);
1062     sizerTop->Add(m_textOut, 0, wxGROW | wxALL, 5);
1063
1064     panel->SetSizer(sizerTop);
1065     sizerTop->Fit(this);
1066
1067     Show();
1068 }
1069
1070 void MyPipeFrame::DoGet()
1071 {
1072     // we don't have any way to be notified when any input appears on the
1073     // stream so we have to poll it :-(
1074     //
1075     // NB: this really must be done because otherwise the other program might
1076     //     not have enough time to receive or process our data and we'd read
1077     //     an empty string
1078     while ( !m_process->IsInputAvailable() && m_process->IsInputOpened() )
1079         ;
1080
1081     m_textOut->SetValue(m_in.ReadLine());
1082 }
1083
1084 void MyPipeFrame::OnClose(wxCloseEvent& event)
1085 {
1086     if ( m_process )
1087     {
1088         // we're not interested in getting the process termination notification
1089         // if we are closing it ourselves
1090         wxProcess *process = m_process;
1091         m_process = NULL;
1092         process->SetNextHandler(NULL);
1093
1094         process->CloseOutput();
1095     }
1096
1097     event.Skip();
1098 }
1099
1100 void MyPipeFrame::OnProcessTerm(wxProcessEvent& WXUNUSED(event))
1101 {
1102     delete m_process;
1103     m_process = NULL;
1104
1105     wxLogWarning(_T("The other process has terminated, closing"));
1106
1107     Close();
1108 }