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
  22     #pragma interface
  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 #include "wx/ffile.h"
  60
  61 #include "wx/process.h"
  62
  63 #include "wx/mimetype.h"
  64
  65 #ifdef __WINDOWS__
  66     #include "wx/dde.h"
  67 #endif // __WINDOWS__
  68
  69 // ----------------------------------------------------------------------------
  70 // the usual application and main frame classes
  71 // ----------------------------------------------------------------------------
  72
  73 // Define a new application type, each program should derive a class from wxApp
  74 class MyApp : public wxApp
  75 {
  76 public:
  77     // override base class virtuals
  78     // ----------------------------
  79
  80     // this one is called on application startup and is a good place for the app
  81     // initialization (doing it here and not in the ctor allows to have an error
  82     // return: if OnInit() returns false, the application terminates)
  83     virtual bool OnInit();
  84 };
  85
  86 // Define an array of process pointers used by MyFrame
  87 class MyPipedProcess;
  88 WX_DEFINE_ARRAY_PTR(MyPipedProcess *, MyProcessesArray);
  89
  90 // Define a new frame type: this is going to be our main frame
  91 class MyFrame : public wxFrame
  92 {
  93 public:
  94     // ctor(s)
  95     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  96
  97     // event handlers (these functions should _not_ be virtual)
  98     void OnQuit(wxCommandEvent& event);
  99
 100     void OnKill(wxCommandEvent& event);
 101
 102     void OnClear(wxCommandEvent& event);
 103
 104     void OnSyncExec(wxCommandEvent& event);
 105     void OnAsyncExec(wxCommandEvent& event);
 106     void OnShell(wxCommandEvent& event);
 107     void OnExecWithRedirect(wxCommandEvent& event);
 108     void OnExecWithPipe(wxCommandEvent& event);
 109
 110     void OnPOpen(wxCommandEvent& event);
 111
 112     void OnFileExec(wxCommandEvent& event);
 113
 114     void OnAbout(wxCommandEvent& event);
 115
 116     // polling output of async processes
 117     void OnTimer(wxTimerEvent& event);
 118     void OnIdle(wxIdleEvent& event);
 119
 120     // for MyPipedProcess
 121     void OnProcessTerminated(MyPipedProcess *process);
 122     wxListBox *GetLogListBox() const { return m_lbox; }
 123
 124 private:
 125     void ShowOutput(const wxString& cmd,
 126                     const wxArrayString& output,
 127                     const wxString& title);
 128
 129     void DoAsyncExec(const wxString& cmd);
 130
 131     void AddAsyncProcess(MyPipedProcess *process)
 132     {
 133         if ( m_running.IsEmpty() )
 134         {
 135             // we want to start getting the timer events to ensure that a
 136             // steady stream of idle events comes in -- otherwise we
 137             // wouldn't be able to poll the child process input
 138             m_timerIdleWakeUp.Start(100);
 139         }
 140         //else: the timer is already running
 141
 142         m_running.Add(process);
 143     }
 144
 145     void RemoveAsyncProcess(MyPipedProcess *process)
 146     {
 147         m_running.Remove(process);
 148
 149         if ( m_running.IsEmpty() )
 150         {
 151             // we don't need to get idle events all the time any more
 152             m_timerIdleWakeUp.Stop();
 153         }
 154     }
 155
 156     // the PID of the last process we launched asynchronously
 157     long m_pidLast;
 158
 159     // last command we executed
 160     wxString m_cmdLast;
 161
 162 #ifdef __WINDOWS__
 163     void OnDDEExec(wxCommandEvent& event);
 164     void OnDDERequest(wxCommandEvent& event);
 165
 166     bool GetDDEServer();
 167
 168     // last params of a DDE transaction
 169     wxString m_server,
 170              m_topic,
 171              m_cmdDde;
 172 #endif // __WINDOWS__
 173
 174     wxListBox *m_lbox;
 175
 176     MyProcessesArray m_running;
 177
 178     // the idle event wake up timer
 179     wxTimer m_timerIdleWakeUp;
 180
 181     // any class wishing to process wxWidgets events must use this macro
 182     DECLARE_EVENT_TABLE()
 183 };
 184
 185 // ----------------------------------------------------------------------------
 186 // MyPipeFrame: allows the user to communicate with the child process
 187 // ----------------------------------------------------------------------------
 188
 189 class MyPipeFrame : public wxFrame
 190 {
 191 public:
 192     MyPipeFrame(wxFrame *parent,
 193                 const wxString& cmd,
 194                 wxProcess *process);
 195
 196 protected:
 197     void OnTextEnter(wxCommandEvent& WXUNUSED(event)) { DoSend(); }
 198     void OnBtnSend(wxCommandEvent& WXUNUSED(event)) { DoSend(); }
 199     void OnBtnSendFile(wxCommandEvent& WXUNUSED(event));
 200     void OnBtnGet(wxCommandEvent& WXUNUSED(event)) { DoGet(); }
 201     void OnBtnClose(wxCommandEvent& WXUNUSED(event)) { DoClose(); }
 202
 203     void OnClose(wxCloseEvent& event);
 204
 205     void OnProcessTerm(wxProcessEvent& event);
 206
 207     void DoSend()
 208     {
 209         wxString s(m_textOut->GetValue());
 210         s += _T('\n');
 211         m_out.Write(s.c_str(), s.length());
 212         m_textOut->Clear();
 213
 214         DoGet();
 215     }
 216
 217     void DoGet();
 218     void DoClose();
 219
 220 private:
 221     void DoGetFromStream(wxTextCtrl *text, wxInputStream& in);
 222     void DisableInput();
 223     void DisableOutput();
 224
 225
 226     wxProcess *m_process;
 227
 228     wxOutputStream &m_out;
 229     wxInputStream &m_in,
 230                   &m_err;
 231
 232     wxTextCtrl *m_textOut,
 233                *m_textIn,
 234                *m_textErr;
 235
 236     DECLARE_EVENT_TABLE()
 237 };
 238
 239 // ----------------------------------------------------------------------------
 240 // wxProcess-derived classes
 241 // ----------------------------------------------------------------------------
 242
 243 // This is the handler for process termination events
 244 class MyProcess : public wxProcess
 245 {
 246 public:
 247     MyProcess(MyFrame *parent, const wxString& cmd)
 248         : wxProcess(parent), m_cmd(cmd)
 249     {
 250         m_parent = parent;
 251     }
 252
 253     // instead of overriding this virtual function we might as well process the
 254     // event from it in the frame class - this might be more convenient in some
 255     // cases
 256     virtual void OnTerminate(int pid, int status);
 257
 258 protected:
 259     MyFrame *m_parent;
 260     wxString m_cmd;
 261 };
 262
 263 // A specialization of MyProcess for redirecting the output
 264 class MyPipedProcess : public MyProcess
 265 {
 266 public:
 267     MyPipedProcess(MyFrame *parent, const wxString& cmd)
 268         : MyProcess(parent, cmd)
 269         {
 270             Redirect();
 271         }
 272
 273     virtual void OnTerminate(int pid, int status);
 274
 275     virtual bool HasInput();
 276 };
 277
 278 // A version of MyPipedProcess which also sends input to the stdin of the
 279 // child process
 280 class MyPipedProcess2 : public MyPipedProcess
 281 {
 282 public:
 283     MyPipedProcess2(MyFrame *parent, const wxString& cmd, const wxString& input)
 284         : MyPipedProcess(parent, cmd), m_input(input)
 285         {
 286         }
 287
 288     virtual bool HasInput();
 289
 290 private:
 291     wxString m_input;
 292 };
 293
 294 // ----------------------------------------------------------------------------
 295 // constants
 296 // ----------------------------------------------------------------------------
 297
 298 // IDs for the controls and the menu commands
 299 enum
 300 {
 301     // menu items
 302     Exec_Quit = 100,
 303     Exec_Kill,
 304     Exec_ClearLog,
 305     Exec_SyncExec = 200,
 306     Exec_AsyncExec,
 307     Exec_Shell,
 308     Exec_POpen,
 309     Exec_OpenFile,
 310     Exec_DDEExec,
 311     Exec_DDERequest,
 312     Exec_Redirect,
 313     Exec_Pipe,
 314     Exec_About = 300,
 315
 316     // control ids
 317     Exec_Btn_Send = 1000,
 318     Exec_Btn_SendFile,
 319     Exec_Btn_Get,
 320     Exec_Btn_Close
 321 };
 322
 323 static const wxChar *DIALOG_TITLE = _T("Exec sample");
 324
 325 // ----------------------------------------------------------------------------
 326 // event tables and other macros for wxWidgets
 327 // ----------------------------------------------------------------------------
 328
 329 // the event tables connect the wxWidgets events with the functions (event
 330 // handlers) which process them. It can be also done at run-time, but for the
 331 // simple menu events like this the static method is much simpler.
 332 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 333     EVT_MENU(Exec_Quit,  MyFrame::OnQuit)
 334     EVT_MENU(Exec_Kill,  MyFrame::OnKill)
 335     EVT_MENU(Exec_ClearLog,  MyFrame::OnClear)
 336
 337     EVT_MENU(Exec_SyncExec, MyFrame::OnSyncExec)
 338     EVT_MENU(Exec_AsyncExec, MyFrame::OnAsyncExec)
 339     EVT_MENU(Exec_Shell, MyFrame::OnShell)
 340     EVT_MENU(Exec_Redirect, MyFrame::OnExecWithRedirect)
 341     EVT_MENU(Exec_Pipe, MyFrame::OnExecWithPipe)
 342
 343     EVT_MENU(Exec_POpen, MyFrame::OnPOpen)
 344
 345     EVT_MENU(Exec_OpenFile, MyFrame::OnFileExec)
 346
 347 #ifdef __WINDOWS__
 348     EVT_MENU(Exec_DDEExec, MyFrame::OnDDEExec)
 349     EVT_MENU(Exec_DDERequest, MyFrame::OnDDERequest)
 350 #endif // __WINDOWS__
 351
 352     EVT_MENU(Exec_About, MyFrame::OnAbout)
 353
 354     EVT_IDLE(MyFrame::OnIdle)
 355
 356     EVT_TIMER(wxID_ANY, MyFrame::OnTimer)
 357 END_EVENT_TABLE()
 358
 359 BEGIN_EVENT_TABLE(MyPipeFrame, wxFrame)
 360     EVT_BUTTON(Exec_Btn_Send, MyPipeFrame::OnBtnSend)
 361     EVT_BUTTON(Exec_Btn_SendFile, MyPipeFrame::OnBtnSendFile)
 362     EVT_BUTTON(Exec_Btn_Get, MyPipeFrame::OnBtnGet)
 363     EVT_BUTTON(Exec_Btn_Close, MyPipeFrame::OnBtnClose)
 364
 365     EVT_TEXT_ENTER(wxID_ANY, MyPipeFrame::OnTextEnter)
 366
 367     EVT_CLOSE(MyPipeFrame::OnClose)
 368
 369     EVT_END_PROCESS(wxID_ANY, MyPipeFrame::OnProcessTerm)
 370 END_EVENT_TABLE()
 371
 372 // Create a new application object: this macro will allow wxWidgets to create
 373 // the application object during program execution (it's better than using a
 374 // static object for many reasons) and also declares the accessor function
 375 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 376 // not wxApp)
 377 IMPLEMENT_APP(MyApp)
 378
 379 // ============================================================================
 380 // implementation
 381 // ============================================================================
 382
 383 // ----------------------------------------------------------------------------
 384 // the application class
 385 // ----------------------------------------------------------------------------
 386
 387 // `Main program' equivalent: the program execution "starts" here
 388 bool MyApp::OnInit()
 389 {
 390     // Create the main application window
 391     MyFrame *frame = new MyFrame(_T("Exec wxWidgets sample"),
 392                                  wxDefaultPosition, wxSize(500, 140));
 393
 394     // Show it and tell the application that it's our main window
 395     frame->Show(true);
 396     SetTopWindow(frame);
 397
 398     // success: wxApp::OnRun() will be called which will enter the main message
 399     // loop and the application will run. If we returned false here, the
 400     // application would exit immediately.
 401     return true;
 402 }
 403
 404 // ----------------------------------------------------------------------------
 405 // main frame
 406 // ----------------------------------------------------------------------------
 407
 408 #ifdef __VISUALC__
 409 #pragma warning(disable: 4355) // this used in base member initializer list
 410 #endif
 411
 412 // frame constructor
 413 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 414        : wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size),
 415          m_timerIdleWakeUp(this)
 416 {
 417     m_pidLast = 0;
 418
 419 #ifdef __WXMAC__
 420     // we need this in order to allow the about menu relocation, since ABOUT is
 421     // not the default id of the about menu
 422     wxApp::s_macAboutMenuItemId = Exec_About;
 423 #endif
 424
 425     // create a menu bar
 426     wxMenu *menuFile = new wxMenu(_T(""), wxMENU_TEAROFF);
 427     menuFile->Append(Exec_Kill, _T("&Kill process...\tCtrl-K"),
 428                      _T("Kill a process by PID"));
 429     menuFile->AppendSeparator();
 430     menuFile->Append(Exec_ClearLog, _T("&Clear log\tCtrl-C"),
 431                      _T("Clear the log window"));
 432     menuFile->AppendSeparator();
 433     menuFile->Append(Exec_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
 434
 435     wxMenu *execMenu = new wxMenu;
 436     execMenu->Append(Exec_SyncExec, _T("Sync &execution...\tCtrl-E"),
 437                      _T("Launch a program and return when it terminates"));
 438     execMenu->Append(Exec_AsyncExec, _T("&Async execution...\tCtrl-A"),
 439                      _T("Launch a program and return immediately"));
 440     execMenu->Append(Exec_Shell, _T("Execute &shell command...\tCtrl-S"),
 441                      _T("Launch a shell and execute a command in it"));
 442     execMenu->AppendSeparator();
 443     execMenu->Append(Exec_Redirect, _T("Capture command &output...\tCtrl-O"),
 444                      _T("Launch a program and capture its output"));
 445     execMenu->Append(Exec_Pipe, _T("&Pipe through command..."),
 446                      _T("Pipe a string through a filter"));
 447     execMenu->Append(Exec_POpen, _T("&Open a pipe to a command...\tCtrl-P"),
 448                      _T("Open a pipe to and from another program"));
 449
 450     execMenu->AppendSeparator();
 451     execMenu->Append(Exec_OpenFile, _T("Open &file...\tCtrl-F"),
 452                      _T("Launch the command to open this kind of files"));
 453 #ifdef __WINDOWS__
 454     execMenu->AppendSeparator();
 455     execMenu->Append(Exec_DDEExec, _T("Execute command via &DDE...\tCtrl-D"));
 456     execMenu->Append(Exec_DDERequest, _T("Send DDE &request...\tCtrl-R"));
 457 #endif
 458
 459     wxMenu *helpMenu = new wxMenu(_T(""), wxMENU_TEAROFF);
 460     helpMenu->Append(Exec_About, _T("&About...\tF1"), _T("Show about dialog"));
 461
 462     // now append the freshly created menu to the menu bar...
 463     wxMenuBar *menuBar = new wxMenuBar();
 464     menuBar->Append(menuFile, _T("&File"));
 465     menuBar->Append(execMenu, _T("&Exec"));
 466     menuBar->Append(helpMenu, _T("&Help"));
 467
 468     // ... and attach this menu bar to the frame
 469     SetMenuBar(menuBar);
 470
 471     // create the listbox in which we will show misc messages as they come
 472     m_lbox = new wxListBox(this, wxID_ANY);
 473     wxFont font(12, wxFONTFAMILY_TELETYPE, wxFONTSTYLE_NORMAL,
 474                 wxFONTWEIGHT_NORMAL);
 475     if ( font.Ok() )
 476         m_lbox->SetFont(font);
 477
 478 #if wxUSE_STATUSBAR
 479     // create a status bar just for fun (by default with 1 pane only)
 480     CreateStatusBar();
 481     SetStatusText(_T("Welcome to wxWidgets exec sample!"));
 482 #endif // wxUSE_STATUSBAR
 483 }
 484
 485 // ----------------------------------------------------------------------------
 486 // event handlers: file and help menu
 487 // ----------------------------------------------------------------------------
 488
 489 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 490 {
 491     // true is to force the frame to close
 492     Close(true);
 493 }
 494
 495 void MyFrame::OnClear(wxCommandEvent& WXUNUSED(event))
 496 {
 497     m_lbox->Clear();
 498 }
 499
 500 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 501 {
 502     wxMessageBox(_T("Exec wxWidgets Sample\n(c) 2000-2002 Vadim Zeitlin"),
 503                  _T("About Exec"), wxOK | wxICON_INFORMATION, this);
 504 }
 505
 506 void MyFrame::OnKill(wxCommandEvent& WXUNUSED(event))
 507 {
 508     long pid = wxGetNumberFromUser(_T("Please specify the process to kill"),
 509                                    _T("Enter PID:"),
 510                                    _T("Exec question"),
 511                                    m_pidLast,
 512                                    // we need the full unsigned int range
 513                                    -INT_MAX, INT_MAX,
 514                                    this);
 515     if ( pid == -1 )
 516     {
 517         // cancelled
 518         return;
 519     }
 520
 521     static const wxString signalNames[] =
 522     {
 523         _T("Just test (SIGNONE)"),
 524         _T("Hangup (SIGHUP)"),
 525         _T("Interrupt (SIGINT)"),
 526         _T("Quit (SIGQUIT)"),
 527         _T("Illegal instruction (SIGILL)"),
 528         _T("Trap (SIGTRAP)"),
 529         _T("Abort (SIGABRT)"),
 530         _T("Emulated trap (SIGEMT)"),
 531         _T("FP exception (SIGFPE)"),
 532         _T("Kill (SIGKILL)"),
 533         _T("Bus (SIGBUS)"),
 534         _T("Segment violation (SIGSEGV)"),
 535         _T("System (SIGSYS)"),
 536         _T("Broken pipe (SIGPIPE)"),
 537         _T("Alarm (SIGALRM)"),
 538         _T("Terminate (SIGTERM)"),
 539     };
 540
 541     int sig = wxGetSingleChoiceIndex(_T("How to kill the process?"),
 542                                      _T("Exec question"),
 543                                      WXSIZEOF(signalNames), signalNames,
 544                                      this);
 545     switch ( sig )
 546     {
 547         default:
 548             wxFAIL_MSG( _T("unexpected return value") );
 549             // fall through
 550
 551         case -1:
 552             // cancelled
 553             return;
 554
 555         case wxSIGNONE:
 556         case wxSIGHUP:
 557         case wxSIGINT:
 558         case wxSIGQUIT:
 559         case wxSIGILL:
 560         case wxSIGTRAP:
 561         case wxSIGABRT:
 562         case wxSIGEMT:
 563         case wxSIGFPE:
 564         case wxSIGKILL:
 565         case wxSIGBUS:
 566         case wxSIGSEGV:
 567         case wxSIGSYS:
 568         case wxSIGPIPE:
 569         case wxSIGALRM:
 570         case wxSIGTERM:
 571             break;
 572     }
 573
 574     if ( sig == 0 )
 575     {
 576         if ( wxProcess::Exists(pid) )
 577             wxLogStatus(_T("Process %ld is running."), pid);
 578         else
 579             wxLogStatus(_T("No process with pid = %ld."), pid);
 580     }
 581     else // not SIGNONE
 582     {
 583         wxKillError rc = wxProcess::Kill(pid, (wxSignal)sig);
 584         if ( rc == wxKILL_OK )
 585         {
 586             wxLogStatus(_T("Process %ld killed with signal %d."), pid, sig);
 587         }
 588         else
 589         {
 590             static const wxChar *errorText[] =
 591             {
 592                 _T(""), // no error
 593                 _T("signal not supported"),
 594                 _T("permission denied"),
 595                 _T("no such process"),
 596                 _T("unspecified error"),
 597             };
 598
 599             wxLogStatus(_T("Failed to kill process %ld with signal %d: %s"),
 600                         pid, sig, errorText[rc]);
 601         }
 602     }
 603 }
 604
 605 // ----------------------------------------------------------------------------
 606 // event handlers: exec menu
 607 // ----------------------------------------------------------------------------
 608
 609 void MyFrame::DoAsyncExec(const wxString& cmd)
 610 {
 611     wxProcess *process = new MyProcess(this, cmd);
 612     m_pidLast = wxExecute(cmd, wxEXEC_ASYNC, process);
 613     if ( !m_pidLast )
 614     {
 615         wxLogError( _T("Execution of '%s' failed."), cmd.c_str() );
 616
 617         delete process;
 618     }
 619     else
 620     {
 621         wxLogStatus( _T("Process %ld (%s) launched."),
 622             m_pidLast, cmd.c_str() );
 623
 624         m_cmdLast = cmd;
 625     }
 626 }
 627
 628 void MyFrame::OnSyncExec(wxCommandEvent& WXUNUSED(event))
 629 {
 630     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 631                                      DIALOG_TITLE,
 632                                      m_cmdLast);
 633
 634     if ( !cmd )
 635         return;
 636
 637     wxLogStatus( _T("'%s' is running please wait..."), cmd.c_str() );
 638
 639     int code = wxExecute(cmd, wxEXEC_SYNC);
 640
 641     wxLogStatus(_T("Process '%s' terminated with exit code %d."),
 642         cmd.c_str(), code);
 643
 644     m_cmdLast = cmd;
 645 }
 646
 647 void MyFrame::OnAsyncExec(wxCommandEvent& WXUNUSED(event))
 648 {
 649     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 650                                      DIALOG_TITLE,
 651                                      m_cmdLast);
 652
 653     if ( !cmd )
 654         return;
 655
 656     DoAsyncExec(cmd);
 657 }
 658
 659 void MyFrame::OnShell(wxCommandEvent& WXUNUSED(event))
 660 {
 661     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 662                                      DIALOG_TITLE,
 663                                      m_cmdLast);
 664
 665     if ( !cmd )
 666         return;
 667
 668     int code = wxShell(cmd);
 669     wxLogStatus(_T("Shell command '%s' terminated with exit code %d."),
 670                 cmd.c_str(), code);
 671     m_cmdLast = cmd;
 672 }
 673
 674 void MyFrame::OnExecWithRedirect(wxCommandEvent& WXUNUSED(event))
 675 {
 676     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 677                                      DIALOG_TITLE,
 678                                      m_cmdLast);
 679
 680     if ( !cmd )
 681         return;
 682
 683     bool sync;
 684     switch ( wxMessageBox(_T("Execute it synchronously?"),
 685                           _T("Exec question"),
 686                           wxYES_NO | wxCANCEL | wxICON_QUESTION, this) )
 687     {
 688         case wxYES:
 689             sync = true;
 690             break;
 691
 692         case wxNO:
 693             sync = false;
 694             break;
 695
 696         default:
 697             return;
 698     }
 699
 700     if ( sync )
 701     {
 702         wxArrayString output, errors;
 703         int code = wxExecute(cmd, output, errors);
 704         wxLogStatus(_T("command '%s' terminated with exit code %d."),
 705                     cmd.c_str(), code);
 706
 707         if ( code != -1 )
 708         {
 709             ShowOutput(cmd, output, _T("Output"));
 710             ShowOutput(cmd, errors, _T("Errors"));
 711         }
 712     }
 713     else // async exec
 714     {
 715         MyPipedProcess *process = new MyPipedProcess(this, cmd);
 716         if ( !wxExecute(cmd, wxEXEC_ASYNC, process) )
 717         {
 718             wxLogError(_T("Execution of '%s' failed."), cmd.c_str());
 719
 720             delete process;
 721         }
 722         else
 723         {
 724             AddAsyncProcess(process);
 725         }
 726     }
 727
 728     m_cmdLast = cmd;
 729 }
 730
 731 void MyFrame::OnExecWithPipe(wxCommandEvent& WXUNUSED(event))
 732 {
 733     if ( !m_cmdLast )
 734         m_cmdLast = _T("tr [a-z] [A-Z]");
 735
 736     wxString cmd = wxGetTextFromUser(_T("Enter the command: "),
 737                                      DIALOG_TITLE,
 738                                      m_cmdLast);
 739
 740     if ( !cmd )
 741         return;
 742
 743     wxString input = wxGetTextFromUser(_T("Enter the string to send to it: "),
 744                                        DIALOG_TITLE);
 745     if ( !input )
 746         return;
 747
 748     // always execute the filter asynchronously
 749     MyPipedProcess2 *process = new MyPipedProcess2(this, cmd, input);
 750     long pid = wxExecute(cmd, wxEXEC_ASYNC, process);
 751     if ( pid )
 752     {
 753         wxLogStatus( _T("Process %ld (%s) launched."), pid, cmd.c_str() );
 754
 755         AddAsyncProcess(process);
 756     }
 757     else
 758     {
 759         wxLogError(_T("Execution of '%s' failed."), cmd.c_str());
 760
 761         delete process;
 762     }
 763
 764     m_cmdLast = cmd;
 765 }
 766
 767 void MyFrame::OnPOpen(wxCommandEvent& WXUNUSED(event))
 768 {
 769     wxString cmd = wxGetTextFromUser(_T("Enter the command to launch: "),
 770                                      DIALOG_TITLE,
 771                                      m_cmdLast);
 772     if ( cmd.empty() )
 773         return;
 774
 775     wxProcess *process = wxProcess::Open(cmd);
 776     if ( !process )
 777     {
 778         wxLogError(_T("Failed to launch the command."));
 779         return;
 780     }
 781
 782     wxOutputStream *out = process->GetOutputStream();
 783     if ( !out )
 784     {
 785         wxLogError(_T("Failed to connect to child stdin"));
 786         return;
 787     }
 788
 789     wxInputStream *in = process->GetInputStream();
 790     if ( !in )
 791     {
 792         wxLogError(_T("Failed to connect to child stdout"));
 793         return;
 794     }
 795
 796     new MyPipeFrame(this, cmd, process);
 797 }
 798
 799 void MyFrame::OnFileExec(wxCommandEvent& WXUNUSED(event))
 800 {
 801     static wxString s_filename;
 802
 803     wxString filename = wxLoadFileSelector(_T(""), _T(""), s_filename);
 804     if ( !filename )
 805         return;
 806
 807     s_filename = filename;
 808
 809     wxString ext = filename.AfterFirst(_T('.'));
 810     wxFileType *ft = wxTheMimeTypesManager->GetFileTypeFromExtension(ext);
 811     if ( !ft )
 812     {
 813         wxLogError(_T("Impossible to determine the file type for extension '%s'"),
 814                    ext.c_str());
 815         return;
 816     }
 817
 818     wxString cmd;
 819     bool ok = ft->GetOpenCommand(&cmd,
 820                                  wxFileType::MessageParameters(filename, _T("")));
 821     delete ft;
 822     if ( !ok )
 823     {
 824         wxLogError(_T("Impossible to find out how to open files of extension '%s'"),
 825                    ext.c_str());
 826         return;
 827     }
 828
 829     DoAsyncExec(cmd);
 830 }
 831
 832 // ----------------------------------------------------------------------------
 833 // DDE stuff
 834 // ----------------------------------------------------------------------------
 835
 836 #ifdef __WINDOWS__
 837
 838 bool MyFrame::GetDDEServer()
 839 {
 840     wxString server = wxGetTextFromUser(_T("Server to connect to:"),
 841                                         DIALOG_TITLE, m_server);
 842     if ( !server )
 843         return false;
 844
 845     m_server = server;
 846
 847     wxString topic = wxGetTextFromUser(_T("DDE topic:"), DIALOG_TITLE, m_topic);
 848     if ( !topic )
 849         return false;
 850
 851     m_topic = topic;
 852
 853     wxString cmd = wxGetTextFromUser(_T("DDE command:"), DIALOG_TITLE, m_cmdDde);
 854     if ( !cmd )
 855         return false;
 856
 857     m_cmdDde = cmd;
 858
 859     return true;
 860 }
 861
 862 void MyFrame::OnDDEExec(wxCommandEvent& WXUNUSED(event))
 863 {
 864     if ( !GetDDEServer() )
 865         return;
 866
 867     wxDDEClient client;
 868     wxConnectionBase *conn = client.MakeConnection(_T(""), m_server, m_topic);
 869     if ( !conn )
 870     {
 871         wxLogError(_T("Failed to connect to the DDE server '%s'."),
 872                    m_server.c_str());
 873     }
 874     else
 875     {
 876         if ( !conn->Execute(m_cmdDde) )
 877         {
 878             wxLogError(_T("Failed to execute command '%s' via DDE."),
 879                        m_cmdDde.c_str());
 880         }
 881         else
 882         {
 883             wxLogStatus(_T("Successfully executed DDE command"));
 884         }
 885     }
 886 }
 887
 888 void MyFrame::OnDDERequest(wxCommandEvent& WXUNUSED(event))
 889 {
 890     if ( !GetDDEServer() )
 891         return;
 892
 893     wxDDEClient client;
 894     wxConnectionBase *conn = client.MakeConnection(_T(""), m_server, m_topic);
 895     if ( !conn )
 896     {
 897         wxLogError(_T("Failed to connect to the DDE server '%s'."),
 898                    m_server.c_str());
 899     }
 900     else
 901     {
 902         if ( !conn->Request(m_cmdDde) )
 903         {
 904             wxLogError(_T("Failed to  send request '%s' via DDE."),
 905                        m_cmdDde.c_str());
 906         }
 907         else
 908         {
 909             wxLogStatus(_T("Successfully sent DDE request."));
 910         }
 911     }
 912 }
 913
 914 #endif // __WINDOWS__
 915
 916 // ----------------------------------------------------------------------------
 917 // various helpers
 918 // ----------------------------------------------------------------------------
 919
 920 // input polling
 921 void MyFrame::OnIdle(wxIdleEvent& event)
 922 {
 923     size_t count = m_running.GetCount();
 924     for ( size_t n = 0; n < count; n++ )
 925     {
 926         if ( m_running[n]->HasInput() )
 927         {
 928             event.RequestMore();
 929         }
 930     }
 931 }
 932
 933 void MyFrame::OnTimer(wxTimerEvent& WXUNUSED(event))
 934 {
 935     wxWakeUpIdle();
 936 }
 937
 938 void MyFrame::OnProcessTerminated(MyPipedProcess *process)
 939 {
 940     RemoveAsyncProcess(process);
 941 }
 942
 943
 944 void MyFrame::ShowOutput(const wxString& cmd,
 945                          const wxArrayString& output,
 946                          const wxString& title)
 947 {
 948     size_t count = output.GetCount();
 949     if ( !count )
 950         return;
 951
 952     m_lbox->Append(wxString::Format(_T("--- %s of '%s' ---"),
 953                                     title.c_str(), cmd.c_str()));
 954
 955     for ( size_t n = 0; n < count; n++ )
 956     {
 957         m_lbox->Append(output[n]);
 958     }
 959
 960     m_lbox->Append(wxString::Format(_T("--- End of %s ---"),
 961                                     title.Lower().c_str()));
 962 }
 963
 964 // ----------------------------------------------------------------------------
 965 // MyProcess
 966 // ----------------------------------------------------------------------------
 967
 968 void MyProcess::OnTerminate(int pid, int status)
 969 {
 970     wxLogStatus(m_parent, _T("Process %u ('%s') terminated with exit code %d."),
 971                 pid, m_cmd.c_str(), status);
 972
 973     // we're not needed any more
 974     delete this;
 975 }
 976
 977 // ----------------------------------------------------------------------------
 978 // MyPipedProcess
 979 // ----------------------------------------------------------------------------
 980
 981 bool MyPipedProcess::HasInput()
 982 {
 983     bool hasInput = false;
 984
 985     if ( IsInputAvailable() )
 986     {
 987         wxTextInputStream tis(*GetInputStream());
 988
 989         // this assumes that the output is always line buffered
 990         wxString msg;
 991         msg << m_cmd << _T(" (stdout): ") << tis.ReadLine();
 992
 993         m_parent->GetLogListBox()->Append(msg);
 994
 995         hasInput = true;
 996     }
 997
 998     if ( IsErrorAvailable() )
 999     {
1000         wxTextInputStream tis(*GetErrorStream());
1001
1002         // this assumes that the output is always line buffered
1003         wxString msg;
1004         msg << m_cmd << _T(" (stderr): ") << tis.ReadLine();
1005
1006         m_parent->GetLogListBox()->Append(msg);
1007
1008         hasInput = true;
1009     }
1010
1011     return hasInput;
1012 }
1013
1014 void MyPipedProcess::OnTerminate(int pid, int status)
1015 {
1016     // show the rest of the output
1017     while ( HasInput() )
1018         ;
1019
1020     m_parent->OnProcessTerminated(this);
1021
1022     MyProcess::OnTerminate(pid, status);
1023 }
1024
1025 // ----------------------------------------------------------------------------
1026 // MyPipedProcess2
1027 // ----------------------------------------------------------------------------
1028
1029 bool MyPipedProcess2::HasInput()
1030 {
1031     if ( !m_input.empty() )
1032     {
1033         wxTextOutputStream os(*GetOutputStream());
1034         os.WriteString(m_input);
1035
1036         CloseOutput();
1037         m_input.clear();
1038
1039         // call us once again - may be we'll have output
1040         return true;
1041     }
1042
1043     return MyPipedProcess::HasInput();
1044 }
1045
1046 // ============================================================================
1047 // MyPipeFrame implementation
1048 // ============================================================================
1049
1050 MyPipeFrame::MyPipeFrame(wxFrame *parent,
1051                          const wxString& cmd,
1052                          wxProcess *process)
1053            : wxFrame(parent, wxID_ANY, cmd),
1054              m_process(process),
1055              // in a real program we'd check that the streams are !NULL here
1056              m_out(*process->GetOutputStream()),
1057              m_in(*process->GetInputStream()),
1058              m_err(*process->GetErrorStream())
1059 {
1060     m_process->SetNextHandler(this);
1061
1062     wxPanel *panel = new wxPanel(this, wxID_ANY);
1063
1064     m_textOut = new wxTextCtrl(panel, wxID_ANY, _T(""),
1065                               wxDefaultPosition, wxDefaultSize,
1066                               wxTE_PROCESS_ENTER);
1067     m_textIn = new wxTextCtrl(panel, wxID_ANY, _T(""),
1068                                wxDefaultPosition, wxDefaultSize,
1069                                wxTE_MULTILINE | wxTE_RICH);
1070     m_textIn->SetEditable(false);
1071     m_textErr = new wxTextCtrl(panel, wxID_ANY, _T(""),
1072                                wxDefaultPosition, wxDefaultSize,
1073                                wxTE_MULTILINE | wxTE_RICH);
1074     m_textErr->SetEditable(false);
1075
1076     wxSizer *sizerTop = new wxBoxSizer(wxVERTICAL);
1077     sizerTop->Add(m_textOut, 0, wxGROW | wxALL, 5);
1078
1079     wxSizer *sizerBtns = new wxBoxSizer(wxHORIZONTAL);
1080     sizerBtns->
1081         Add(new wxButton(panel, Exec_Btn_Send, _T("&Send")), 0, wxALL, 5);
1082     sizerBtns->
1083         Add(new wxButton(panel, Exec_Btn_SendFile, _T("&File...")), 0, wxALL, 5);
1084     sizerBtns->
1085         Add(new wxButton(panel, Exec_Btn_Get, _T("&Get")), 0, wxALL, 5);
1086     sizerBtns->
1087         Add(new wxButton(panel, Exec_Btn_Close, _T("&Close")), 0, wxALL, 5);
1088
1089     sizerTop->Add(sizerBtns, 0, wxCENTRE | wxALL, 5);
1090     sizerTop->Add(m_textIn, 1, wxGROW | wxALL, 5);
1091     sizerTop->Add(m_textErr, 1, wxGROW | wxALL, 5);
1092
1093     panel->SetSizer(sizerTop);
1094     sizerTop->Fit(this);
1095
1096     Show();
1097 }
1098
1099 void MyPipeFrame::OnBtnSendFile(wxCommandEvent& WXUNUSED(event))
1100 {
1101     wxFileDialog filedlg(this, _T("Select file to send"));
1102     if ( filedlg.ShowModal() != wxID_OK )
1103         return;
1104
1105     wxFFile file(filedlg.GetFilename(), _T("r"));
1106     wxString data;
1107     if ( !file.IsOpened() || !file.ReadAll(&data) )
1108         return;
1109
1110     // can't write the entire string at once, this risk overflowing the pipe
1111     // and we would dead lock
1112     size_t len = data.length();
1113     const wxChar *pc = data.c_str();
1114     while ( len )
1115     {
1116         const size_t CHUNK_SIZE = 4096;
1117         m_out.Write(pc, len > CHUNK_SIZE ? CHUNK_SIZE : len);
1118
1119         // note that not all data could have been written as we don't block on
1120         // the write end of the pipe
1121         const size_t lenChunk = m_out.LastWrite();
1122
1123         pc += lenChunk;
1124         len -= lenChunk;
1125
1126         DoGet();
1127     }
1128 }
1129
1130 void MyPipeFrame::DoGet()
1131 {
1132     // we don't have any way to be notified when any input appears on the
1133     // stream so we have to poll it :-(
1134     DoGetFromStream(m_textIn, m_in);
1135     DoGetFromStream(m_textErr, m_err);
1136 }
1137
1138 void MyPipeFrame::DoGetFromStream(wxTextCtrl *text, wxInputStream& in)
1139 {
1140     while ( in.CanRead() )
1141     {
1142         wxChar buffer[4096];
1143         buffer[in.Read(buffer, WXSIZEOF(buffer) - 1).LastRead()] = _T('\0');
1144
1145         text->AppendText(buffer);
1146     }
1147 }
1148
1149 void MyPipeFrame::DoClose()
1150 {
1151     m_process->CloseOutput();
1152
1153     DisableInput();
1154 }
1155
1156 void MyPipeFrame::DisableInput()
1157 {
1158     m_textOut->SetEditable(false);
1159     FindWindow(Exec_Btn_Send)->Disable();
1160     FindWindow(Exec_Btn_SendFile)->Disable();
1161     FindWindow(Exec_Btn_Close)->Disable();
1162 }
1163
1164 void MyPipeFrame::DisableOutput()
1165 {
1166     FindWindow(Exec_Btn_Get)->Disable();
1167 }
1168
1169 void MyPipeFrame::OnClose(wxCloseEvent& event)
1170 {
1171     if ( m_process )
1172     {
1173         // we're not interested in getting the process termination notification
1174         // if we are closing it ourselves
1175         wxProcess *process = m_process;
1176         m_process = NULL;
1177         process->SetNextHandler(NULL);
1178
1179         process->CloseOutput();
1180     }
1181
1182     event.Skip();
1183 }
1184
1185 void MyPipeFrame::OnProcessTerm(wxProcessEvent& WXUNUSED(event))
1186 {
1187     DoGet();
1188
1189     delete m_process;
1190     m_process = NULL;
1191
1192     wxLogWarning(_T("The other process has terminated, closing"));
1193
1194     DisableInput();
1195     DisableOutput();
1196 }