src/msw/utilsexc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/utilsexec.cpp
   3 // Purpose:     wxExecute implementation for MSW
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998-2002 wxWidgets dev team
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/utils.h"
  33     #include "wx/app.h"
  34     #include "wx/intl.h"
  35     #include "wx/log.h"
  36 #endif
  37
  38 #include "wx/stream.h"
  39 #include "wx/process.h"
  40
  41 #include "wx/apptrait.h"
  42
  43 #include "wx/module.h"
  44
  45 #include "wx/msw/private.h"
  46
  47 #include <ctype.h>
  48
  49 #if !defined(__GNUWIN32__) && !defined(__SALFORDC__) && !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
  50     #include <direct.h>
  51 #ifndef __MWERKS__
  52     #include <dos.h>
  53 #endif
  54 #endif
  55
  56 #if defined(__GNUWIN32__)
  57     #include <sys/unistd.h>
  58     #include <sys/stat.h>
  59 #endif
  60
  61 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
  62     #ifndef __UNIX__
  63         #include <io.h>
  64     #endif
  65
  66     #ifndef __GNUWIN32__
  67         #include <shellapi.h>
  68     #endif
  69 #endif
  70
  71 #include <stdio.h>
  72 #include <stdlib.h>
  73 #include <string.h>
  74 #ifndef __WATCOMC__
  75     #if !(defined(_MSC_VER) && (_MSC_VER > 800))
  76         #include <errno.h>
  77     #endif
  78 #endif
  79 #include <stdarg.h>
  80
  81 #if wxUSE_IPC
  82     #include "wx/dde.h"         // for WX_DDE hack in wxExecute
  83 #endif // wxUSE_IPC
  84
  85 // implemented in utils.cpp
  86 extern "C" WXDLLIMPEXP_BASE HWND
  87 wxCreateHiddenWindow(LPCTSTR *pclassname, LPCTSTR classname, WNDPROC wndproc);
  88
  89 // ----------------------------------------------------------------------------
  90 // constants
  91 // ----------------------------------------------------------------------------
  92
  93 // this message is sent when the process we're waiting for terminates
  94 #define wxWM_PROC_TERMINATED (WM_USER + 10000)
  95
  96 // ----------------------------------------------------------------------------
  97 // this module globals
  98 // ----------------------------------------------------------------------------
  99
 100 // we need to create a hidden window to receive the process termination
 101 // notifications and for this we need a (Win) class name for it which we will
 102 // register the first time it's needed
 103 static const wxChar *wxMSWEXEC_WNDCLASSNAME = wxT("_wxExecute_Internal_Class");
 104 static const wxChar *gs_classForHiddenWindow = NULL;
 105
 106 // ----------------------------------------------------------------------------
 107 // private types
 108 // ----------------------------------------------------------------------------
 109
 110 // structure describing the process we're being waiting for
 111 struct wxExecuteData
 112 {
 113 public:
 114     ~wxExecuteData()
 115     {
 116         if ( !::CloseHandle(hProcess) )
 117         {
 118             wxLogLastError(wxT("CloseHandle(hProcess)"));
 119         }
 120     }
 121
 122     HWND       hWnd;          // window to send wxWM_PROC_TERMINATED to
 123     HANDLE     hProcess;      // handle of the process
 124     DWORD      dwProcessId;   // pid of the process
 125     wxProcess *handler;
 126     DWORD      dwExitCode;    // the exit code of the process
 127     bool       state;         // set to false when the process finishes
 128 };
 129
 130 class wxExecuteModule : public wxModule
 131 {
 132 public:
 133     virtual bool OnInit() { return true; }
 134     virtual void OnExit()
 135     {
 136         if ( *gs_classForHiddenWindow )
 137         {
 138             if ( !::UnregisterClass(wxMSWEXEC_WNDCLASSNAME, wxGetInstance()) )
 139             {
 140                 wxLogLastError(_T("UnregisterClass(wxExecClass)"));
 141             }
 142
 143             gs_classForHiddenWindow = NULL;
 144         }
 145     }
 146
 147 private:
 148     DECLARE_DYNAMIC_CLASS(wxExecuteModule)
 149 };
 150
 151 #if wxUSE_STREAMS && !defined(__WXWINCE__)
 152
 153 // ----------------------------------------------------------------------------
 154 // wxPipeStreams
 155 // ----------------------------------------------------------------------------
 156
 157 class wxPipeInputStream: public wxInputStream
 158 {
 159 public:
 160     wxPipeInputStream(HANDLE hInput);
 161     virtual ~wxPipeInputStream();
 162
 163     // returns true if the pipe is still opened
 164     bool IsOpened() const { return m_hInput != INVALID_HANDLE_VALUE; }
 165
 166     // returns true if there is any data to be read from the pipe
 167     virtual bool CanRead() const;
 168
 169 protected:
 170     size_t OnSysRead(void *buffer, size_t len);
 171
 172 protected:
 173     HANDLE m_hInput;
 174
 175     DECLARE_NO_COPY_CLASS(wxPipeInputStream)
 176 };
 177
 178 class wxPipeOutputStream: public wxOutputStream
 179 {
 180 public:
 181     wxPipeOutputStream(HANDLE hOutput);
 182     virtual ~wxPipeOutputStream() { Close(); }
 183     bool Close();
 184
 185 protected:
 186     size_t OnSysWrite(const void *buffer, size_t len);
 187
 188 protected:
 189     HANDLE m_hOutput;
 190
 191     DECLARE_NO_COPY_CLASS(wxPipeOutputStream)
 192 };
 193
 194 // define this to let wxexec.cpp know that we know what we're doing
 195 #define _WX_USED_BY_WXEXECUTE_
 196 #include "../common/execcmn.cpp"
 197
 198 // ----------------------------------------------------------------------------
 199 // wxPipe represents a Win32 anonymous pipe
 200 // ----------------------------------------------------------------------------
 201
 202 class wxPipe
 203 {
 204 public:
 205     // the symbolic names for the pipe ends
 206     enum Direction
 207     {
 208         Read,
 209         Write
 210     };
 211
 212     // default ctor doesn't do anything
 213     wxPipe() { m_handles[Read] = m_handles[Write] = INVALID_HANDLE_VALUE; }
 214
 215     // create the pipe, return true if ok, false on error
 216     bool Create()
 217     {
 218         // default secutiry attributes
 219         SECURITY_ATTRIBUTES security;
 220
 221         security.nLength              = sizeof(security);
 222         security.lpSecurityDescriptor = NULL;
 223         security.bInheritHandle       = TRUE; // to pass it to the child
 224
 225         if ( !::CreatePipe(&m_handles[0], &m_handles[1], &security, 0) )
 226         {
 227             wxLogSysError(_("Failed to create an anonymous pipe"));
 228
 229             return false;
 230         }
 231
 232         return true;
 233     }
 234
 235     // return true if we were created successfully
 236     bool IsOk() const { return m_handles[Read] != INVALID_HANDLE_VALUE; }
 237
 238     // return the descriptor for one of the pipe ends
 239     HANDLE operator[](Direction which) const { return m_handles[which]; }
 240
 241     // detach a descriptor, meaning that the pipe dtor won't close it, and
 242     // return it
 243     HANDLE Detach(Direction which)
 244     {
 245         HANDLE handle = m_handles[which];
 246         m_handles[which] = INVALID_HANDLE_VALUE;
 247
 248         return handle;
 249     }
 250
 251     // close the pipe descriptors
 252     void Close()
 253     {
 254         for ( size_t n = 0; n < WXSIZEOF(m_handles); n++ )
 255         {
 256             if ( m_handles[n] != INVALID_HANDLE_VALUE )
 257             {
 258                 ::CloseHandle(m_handles[n]);
 259                 m_handles[n] = INVALID_HANDLE_VALUE;
 260             }
 261         }
 262     }
 263
 264     // dtor closes the pipe descriptors
 265     ~wxPipe() { Close(); }
 266
 267 private:
 268     HANDLE m_handles[2];
 269 };
 270
 271 #endif // wxUSE_STREAMS
 272
 273 // ============================================================================
 274 // implementation
 275 // ============================================================================
 276
 277 // ----------------------------------------------------------------------------
 278 // process termination detecting support
 279 // ----------------------------------------------------------------------------
 280
 281 // thread function for the thread monitoring the process termination
 282 static DWORD __stdcall wxExecuteThread(void *arg)
 283 {
 284     wxExecuteData * const data = (wxExecuteData *)arg;
 285
 286     if ( ::WaitForSingleObject(data->hProcess, INFINITE) != WAIT_OBJECT_0 )
 287     {
 288         wxLogDebug(_T("Waiting for the process termination failed!"));
 289     }
 290
 291     // get the exit code
 292     if ( !::GetExitCodeProcess(data->hProcess, &data->dwExitCode) )
 293     {
 294         wxLogLastError(wxT("GetExitCodeProcess"));
 295     }
 296
 297     wxASSERT_MSG( data->dwExitCode != STILL_ACTIVE,
 298                   wxT("process should have terminated") );
 299
 300     // send a message indicating process termination to the window
 301     ::SendMessage(data->hWnd, wxWM_PROC_TERMINATED, 0, (LPARAM)data);
 302
 303     return 0;
 304 }
 305
 306 // window procedure of a hidden window which is created just to receive
 307 // the notification message when a process exits
 308 LRESULT APIENTRY _EXPORT wxExecuteWindowCbk(HWND hWnd, UINT message,
 309                                             WPARAM wParam, LPARAM lParam)
 310 {
 311     if ( message == wxWM_PROC_TERMINATED )
 312     {
 313         DestroyWindow(hWnd);    // we don't need it any more
 314
 315         wxExecuteData * const data = (wxExecuteData *)lParam;
 316         if ( data->handler )
 317         {
 318             data->handler->OnTerminate((int)data->dwProcessId,
 319                                        (int)data->dwExitCode);
 320         }
 321
 322         if ( data->state )
 323         {
 324             // we're executing synchronously, tell the waiting thread
 325             // that the process finished
 326             data->state = 0;
 327         }
 328         else
 329         {
 330             // asynchronous execution - we should do the clean up
 331             delete data;
 332         }
 333
 334         return 0;
 335     }
 336     else
 337     {
 338         return ::DefWindowProc(hWnd, message, wParam, lParam);
 339     }
 340 }
 341
 342 // ============================================================================
 343 // implementation of IO redirection support classes
 344 // ============================================================================
 345
 346 #if wxUSE_STREAMS && !defined(__WXWINCE__)
 347
 348 // ----------------------------------------------------------------------------
 349 // wxPipeInputStreams
 350 // ----------------------------------------------------------------------------
 351
 352 wxPipeInputStream::wxPipeInputStream(HANDLE hInput)
 353 {
 354     m_hInput = hInput;
 355 }
 356
 357 wxPipeInputStream::~wxPipeInputStream()
 358 {
 359     if ( m_hInput != INVALID_HANDLE_VALUE )
 360         ::CloseHandle(m_hInput);
 361 }
 362
 363 bool wxPipeInputStream::CanRead() const
 364 {
 365     if ( !IsOpened() )
 366         return false;
 367
 368     DWORD nAvailable;
 369
 370     // function name is misleading, it works with anon pipes as well
 371     DWORD rc = ::PeekNamedPipe
 372                     (
 373                       m_hInput,     // handle
 374                       NULL, 0,      // ptr to buffer and its size
 375                       NULL,         // [out] bytes read
 376                       &nAvailable,  // [out] bytes available
 377                       NULL          // [out] bytes left
 378                     );
 379
 380     if ( !rc )
 381     {
 382         if ( ::GetLastError() != ERROR_BROKEN_PIPE )
 383         {
 384             // unexpected error
 385             wxLogLastError(_T("PeekNamedPipe"));
 386         }
 387
 388         // don't try to continue reading from a pipe if an error occurred or if
 389         // it had been closed
 390         ::CloseHandle(m_hInput);
 391
 392         wxPipeInputStream *self = wxConstCast(this, wxPipeInputStream);
 393
 394         self->m_hInput = INVALID_HANDLE_VALUE;
 395         self->m_lasterror = wxSTREAM_EOF;
 396
 397         nAvailable = 0;
 398     }
 399
 400     return nAvailable != 0;
 401 }
 402
 403 size_t wxPipeInputStream::OnSysRead(void *buffer, size_t len)
 404 {
 405     if ( !IsOpened() )
 406     {
 407         m_lasterror = wxSTREAM_EOF;
 408
 409         return 0;
 410     }
 411
 412     DWORD bytesRead;
 413     if ( !::ReadFile(m_hInput, buffer, len, &bytesRead, NULL) )
 414     {
 415         m_lasterror = ::GetLastError() == ERROR_BROKEN_PIPE
 416                         ? wxSTREAM_EOF
 417                         : wxSTREAM_READ_ERROR;
 418     }
 419
 420     // bytesRead is set to 0, as desired, if an error occurred
 421     return bytesRead;
 422 }
 423
 424 // ----------------------------------------------------------------------------
 425 // wxPipeOutputStream
 426 // ----------------------------------------------------------------------------
 427
 428 wxPipeOutputStream::wxPipeOutputStream(HANDLE hOutput)
 429 {
 430     m_hOutput = hOutput;
 431
 432     // unblock the pipe to prevent deadlocks when we're writing to the pipe
 433     // from which the child process can't read because it is writing in its own
 434     // end of it
 435     DWORD mode = PIPE_READMODE_BYTE | PIPE_NOWAIT;
 436     if ( !::SetNamedPipeHandleState
 437             (
 438                 m_hOutput,
 439                 &mode,
 440                 NULL,       // collection count (we don't set it)
 441                 NULL        // timeout (we don't set it neither)
 442             ) )
 443     {
 444         wxLogLastError(_T("SetNamedPipeHandleState(PIPE_NOWAIT)"));
 445     }
 446 }
 447
 448 bool wxPipeOutputStream::Close()
 449 {
 450    return ::CloseHandle(m_hOutput) != 0;
 451 }
 452
 453
 454 size_t wxPipeOutputStream::OnSysWrite(const void *buffer, size_t len)
 455 {
 456     m_lasterror = wxSTREAM_NO_ERROR;
 457
 458     DWORD totalWritten = 0;
 459     while ( len > 0 )
 460     {
 461         DWORD chunkWritten;
 462         if ( !::WriteFile(m_hOutput, buffer, len, &chunkWritten, NULL) )
 463         {
 464             m_lasterror = ::GetLastError() == ERROR_BROKEN_PIPE
 465                                 ? wxSTREAM_EOF
 466                                 : wxSTREAM_WRITE_ERROR;
 467             break;
 468         }
 469
 470         if ( !chunkWritten )
 471             break;
 472
 473         buffer = (char *)buffer + chunkWritten;
 474         totalWritten += chunkWritten;
 475         len -= chunkWritten;
 476     }
 477
 478     return totalWritten;
 479 }
 480
 481 #endif // wxUSE_STREAMS
 482
 483 // ============================================================================
 484 // wxExecute functions family
 485 // ============================================================================
 486
 487 #if wxUSE_IPC
 488
 489 // connect to the given server via DDE and ask it to execute the command
 490 static bool wxExecuteDDE(const wxString& ddeServer,
 491                          const wxString& ddeTopic,
 492                          const wxString& ddeCommand)
 493 {
 494     bool ok wxDUMMY_INITIALIZE(false);
 495
 496     wxDDEClient client;
 497     wxConnectionBase *conn = client.MakeConnection(wxEmptyString,
 498                                                    ddeServer,
 499                                                    ddeTopic);
 500     if ( !conn )
 501     {
 502         ok = false;
 503     }
 504     else // connected to DDE server
 505     {
 506         // the added complication here is that although most programs use
 507         // XTYP_EXECUTE for their DDE API, some important ones -- like Word
 508         // and other MS stuff - use XTYP_REQUEST!
 509         //
 510         // moreover, anotheri mportant program (IE) understands both but
 511         // returns an error from Execute() so we must try Request() first
 512         // to avoid doing it twice
 513         {
 514             // we're prepared for this one to fail, so don't show errors
 515             wxLogNull noErrors;
 516
 517             ok = conn->Request(ddeCommand) != NULL;
 518         }
 519
 520         if ( !ok )
 521         {
 522             // now try execute -- but show the errors
 523             ok = conn->Execute(ddeCommand);
 524         }
 525     }
 526
 527     return ok;
 528 }
 529
 530 #endif // wxUSE_IPC
 531
 532 long wxExecute(const wxString& cmd, int flags, wxProcess *handler)
 533 {
 534     wxCHECK_MSG( !cmd.empty(), 0, wxT("empty command in wxExecute") );
 535
 536 #if wxUSE_THREADS
 537     // for many reasons, the code below breaks down if it's called from another
 538     // thread -- this could be fixed, but as Unix versions don't support this
 539     // neither I don't want to waste time on this now
 540     wxASSERT_MSG( wxThread::IsMain(),
 541                     _T("wxExecute() can be called only from the main thread") );
 542 #endif // wxUSE_THREADS
 543
 544     wxString command;
 545
 546 #if wxUSE_IPC
 547     // DDE hack: this is really not pretty, but we need to allow this for
 548     // transparent handling of DDE servers in wxMimeTypesManager. Usually it
 549     // returns the command which should be run to view/open/... a file of the
 550     // given type. Sometimes, however, this command just launches the server
 551     // and an additional DDE request must be made to really open the file. To
 552     // keep all this well hidden from the application, we allow a special form
 553     // of command: WX_DDE#<command>#DDE_SERVER#DDE_TOPIC#DDE_COMMAND in which
 554     // case we execute just <command> and process the rest below
 555     wxString ddeServer, ddeTopic, ddeCommand;
 556     static const size_t lenDdePrefix = 7;   // strlen("WX_DDE:")
 557     if ( cmd.Left(lenDdePrefix) == _T("WX_DDE#") )
 558     {
 559         // speed up the concatenations below
 560         ddeServer.reserve(256);
 561         ddeTopic.reserve(256);
 562         ddeCommand.reserve(256);
 563
 564         const wxChar *p = cmd.c_str() + 7;
 565         while ( *p && *p != _T('#') )
 566         {
 567             command += *p++;
 568         }
 569
 570         if ( *p )
 571         {
 572             // skip '#'
 573             p++;
 574         }
 575         else
 576         {
 577             wxFAIL_MSG(_T("invalid WX_DDE command in wxExecute"));
 578         }
 579
 580         while ( *p && *p != _T('#') )
 581         {
 582             ddeServer += *p++;
 583         }
 584
 585         if ( *p )
 586         {
 587             // skip '#'
 588             p++;
 589         }
 590         else
 591         {
 592             wxFAIL_MSG(_T("invalid WX_DDE command in wxExecute"));
 593         }
 594
 595         while ( *p && *p != _T('#') )
 596         {
 597             ddeTopic += *p++;
 598         }
 599
 600         if ( *p )
 601         {
 602             // skip '#'
 603             p++;
 604         }
 605         else
 606         {
 607             wxFAIL_MSG(_T("invalid WX_DDE command in wxExecute"));
 608         }
 609
 610         while ( *p )
 611         {
 612             ddeCommand += *p++;
 613         }
 614
 615         // if we want to just launch the program and not wait for its
 616         // termination, try to execute DDE command right now, it can succeed if
 617         // the process is already running - but as it fails if it's not
 618         // running, suppress any errors it might generate
 619         if ( !(flags & wxEXEC_SYNC) )
 620         {
 621             wxLogNull noErrors;
 622             if ( wxExecuteDDE(ddeServer, ddeTopic, ddeCommand) )
 623             {
 624                 // a dummy PID - this is a hack, of course, but it's well worth
 625                 // it as we don't open a new server each time we're called
 626                 // which would be quite bad
 627                 return -1;
 628             }
 629         }
 630     }
 631     else
 632 #endif // wxUSE_IPC
 633     {
 634         // no DDE
 635         command = cmd;
 636     }
 637
 638     // the IO redirection is only supported with wxUSE_STREAMS
 639     BOOL redirect = FALSE;
 640
 641 #if wxUSE_STREAMS && !defined(__WXWINCE__)
 642     wxPipe pipeIn, pipeOut, pipeErr;
 643
 644     // we'll save here the copy of pipeIn[Write]
 645     HANDLE hpipeStdinWrite = INVALID_HANDLE_VALUE;
 646
 647     // open the pipes to which child process IO will be redirected if needed
 648     if ( handler && handler->IsRedirected() )
 649     {
 650         // create pipes for redirecting stdin, stdout and stderr
 651         if ( !pipeIn.Create() || !pipeOut.Create() || !pipeErr.Create() )
 652         {
 653             wxLogSysError(_("Failed to redirect the child process IO"));
 654
 655             // indicate failure: we need to return different error code
 656             // depending on the sync flag
 657             return flags & wxEXEC_SYNC ? -1 : 0;
 658         }
 659
 660         redirect = TRUE;
 661     }
 662 #endif // wxUSE_STREAMS
 663
 664     // create the process
 665     STARTUPINFO si;
 666     wxZeroMemory(si);
 667     si.cb = sizeof(si);
 668
 669 #if wxUSE_STREAMS && !defined(__WXWINCE__)
 670     if ( redirect )
 671     {
 672         si.dwFlags = STARTF_USESTDHANDLES;
 673
 674         si.hStdInput = pipeIn[wxPipe::Read];
 675         si.hStdOutput = pipeOut[wxPipe::Write];
 676         si.hStdError = pipeErr[wxPipe::Write];
 677
 678         // when the std IO is redirected, we don't show the (console) process
 679         // window by default, but this can be overridden by the caller by
 680         // specifying wxEXEC_NOHIDE flag
 681         if ( !(flags & wxEXEC_NOHIDE) )
 682         {
 683             si.dwFlags |= STARTF_USESHOWWINDOW;
 684             si.wShowWindow = SW_HIDE;
 685         }
 686
 687         // we must duplicate the handle to the write side of stdin pipe to make
 688         // it non inheritable: indeed, we must close the writing end of pipeIn
 689         // before launching the child process as otherwise this handle will be
 690         // inherited by the child which will never close it and so the pipe
 691         // will never be closed and the child will be left stuck in ReadFile()
 692         HANDLE pipeInWrite = pipeIn.Detach(wxPipe::Write);
 693         if ( !::DuplicateHandle
 694                 (
 695                     ::GetCurrentProcess(),
 696                     pipeInWrite,
 697                     ::GetCurrentProcess(),
 698                     &hpipeStdinWrite,
 699                     0,                      // desired access: unused here
 700                     FALSE,                  // not inherited
 701                     DUPLICATE_SAME_ACCESS   // same access as for src handle
 702                 ) )
 703         {
 704             wxLogLastError(_T("DuplicateHandle"));
 705         }
 706
 707         ::CloseHandle(pipeInWrite);
 708     }
 709 #endif // wxUSE_STREAMS
 710
 711     PROCESS_INFORMATION pi;
 712     DWORD dwFlags = CREATE_SUSPENDED;
 713 #ifndef __WXWINCE__
 714     dwFlags |= CREATE_DEFAULT_ERROR_MODE ;
 715 #endif
 716
 717     bool ok = ::CreateProcess
 718                 (
 719                  NULL,              // application name (use only cmd line)
 720                  (wxChar *)
 721                  command.c_str(),   // full command line
 722                  NULL,              // security attributes: defaults for both
 723                  NULL,              //   the process and its main thread
 724                  redirect,          // inherit handles if we use pipes
 725                  dwFlags,           // process creation flags
 726                  NULL,              // environment (use the same)
 727                  NULL,              // current directory (use the same)
 728                  &si,               // startup info (unused here)
 729                  &pi                // process info
 730                 ) != 0;
 731
 732 #if wxUSE_STREAMS && !defined(__WXWINCE__)
 733     // we can close the pipe ends used by child anyhow
 734     if ( redirect )
 735     {
 736         ::CloseHandle(pipeIn.Detach(wxPipe::Read));
 737         ::CloseHandle(pipeOut.Detach(wxPipe::Write));
 738         ::CloseHandle(pipeErr.Detach(wxPipe::Write));
 739     }
 740 #endif // wxUSE_STREAMS
 741
 742     if ( !ok )
 743     {
 744 #if wxUSE_STREAMS && !defined(__WXWINCE__)
 745         // close the other handles too
 746         if ( redirect )
 747         {
 748             ::CloseHandle(pipeOut.Detach(wxPipe::Read));
 749             ::CloseHandle(pipeErr.Detach(wxPipe::Read));
 750         }
 751 #endif // wxUSE_STREAMS
 752
 753         wxLogSysError(_("Execution of command '%s' failed"), command.c_str());
 754
 755         return flags & wxEXEC_SYNC ? -1 : 0;
 756     }
 757
 758 #if wxUSE_STREAMS && !defined(__WXWINCE__)
 759     // the input buffer bufOut is connected to stdout, this is why it is
 760     // called bufOut and not bufIn
 761     wxStreamTempInputBuffer bufOut,
 762                             bufErr;
 763
 764     if ( redirect )
 765     {
 766         // We can now initialize the wxStreams
 767         wxPipeInputStream *
 768             outStream = new wxPipeInputStream(pipeOut.Detach(wxPipe::Read));
 769         wxPipeInputStream *
 770             errStream = new wxPipeInputStream(pipeErr.Detach(wxPipe::Read));
 771         wxPipeOutputStream *
 772             inStream = new wxPipeOutputStream(hpipeStdinWrite);
 773
 774         handler->SetPipeStreams(outStream, inStream, errStream);
 775
 776         bufOut.Init(outStream);
 777         bufErr.Init(errStream);
 778     }
 779 #endif // wxUSE_STREAMS
 780
 781     // create a hidden window to receive notification about process
 782     // termination
 783     HWND hwnd = wxCreateHiddenWindow
 784                 (
 785                     &gs_classForHiddenWindow,
 786                     wxMSWEXEC_WNDCLASSNAME,
 787                     (WNDPROC)wxExecuteWindowCbk
 788                 );
 789
 790     wxASSERT_MSG( hwnd, wxT("can't create a hidden window for wxExecute") );
 791
 792     // Alloc data
 793     wxExecuteData *data = new wxExecuteData;
 794     data->hProcess    = pi.hProcess;
 795     data->dwProcessId = pi.dwProcessId;
 796     data->hWnd        = hwnd;
 797     data->state       = (flags & wxEXEC_SYNC) != 0;
 798     if ( flags & wxEXEC_SYNC )
 799     {
 800         // handler may be !NULL for capturing program output, but we don't use
 801         // it wxExecuteData struct in this case
 802         data->handler = NULL;
 803     }
 804     else
 805     {
 806         // may be NULL or not
 807         data->handler = handler;
 808     }
 809
 810     DWORD tid;
 811     HANDLE hThread = ::CreateThread(NULL,
 812                                     0,
 813                                     wxExecuteThread,
 814                                     (void *)data,
 815                                     0,
 816                                     &tid);
 817
 818     // resume process we created now - whether the thread creation succeeded or
 819     // not
 820     if ( ::ResumeThread(pi.hThread) == (DWORD)-1 )
 821     {
 822         // ignore it - what can we do?
 823         wxLogLastError(wxT("ResumeThread in wxExecute"));
 824     }
 825
 826     // close unneeded handle
 827     if ( !::CloseHandle(pi.hThread) )
 828         wxLogLastError(wxT("CloseHandle(hThread)"));
 829
 830     if ( !hThread )
 831     {
 832         wxLogLastError(wxT("CreateThread in wxExecute"));
 833
 834         DestroyWindow(hwnd);
 835         delete data;
 836
 837         // the process still started up successfully...
 838         return pi.dwProcessId;
 839     }
 840
 841     ::CloseHandle(hThread);
 842
 843 #if wxUSE_IPC && !defined(__WXWINCE__)
 844     // second part of DDE hack: now establish the DDE conversation with the
 845     // just launched process
 846     if ( !ddeServer.empty() )
 847     {
 848         bool ok;
 849
 850         // give the process the time to init itself
 851         //
 852         // we use a very big timeout hoping that WaitForInputIdle() will return
 853         // much sooner, but not INFINITE just in case the process hangs
 854         // completely - like this we will regain control sooner or later
 855         switch ( ::WaitForInputIdle(pi.hProcess, 10000 /* 10 seconds */) )
 856         {
 857             default:
 858                 wxFAIL_MSG( _T("unexpected WaitForInputIdle() return code") );
 859                 // fall through
 860
 861             case -1:
 862                 wxLogLastError(_T("WaitForInputIdle() in wxExecute"));
 863
 864             case WAIT_TIMEOUT:
 865                 wxLogDebug(_T("Timeout too small in WaitForInputIdle"));
 866
 867                 ok = false;
 868                 break;
 869
 870             case 0:
 871                 // ok, process ready to accept DDE requests
 872                 ok = wxExecuteDDE(ddeServer, ddeTopic, ddeCommand);
 873         }
 874
 875         if ( !ok )
 876         {
 877             wxLogDebug(_T("Failed to send DDE request to the process \"%s\"."),
 878                        cmd.c_str());
 879         }
 880     }
 881 #endif // wxUSE_IPC
 882
 883     if ( !(flags & wxEXEC_SYNC) )
 884     {
 885         // clean up will be done when the process terminates
 886
 887         // return the pid
 888         return pi.dwProcessId;
 889     }
 890
 891     wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
 892     wxCHECK_MSG( traits, -1, _T("no wxAppTraits in wxExecute()?") );
 893
 894     void *cookie = NULL;
 895     if ( !(flags & wxEXEC_NODISABLE) )
 896     {
 897         // disable all app windows while waiting for the child process to finish
 898         cookie = traits->BeforeChildWaitLoop();
 899     }
 900
 901     // wait until the child process terminates
 902     while ( data->state )
 903     {
 904 #if wxUSE_STREAMS && !defined(__WXWINCE__)
 905         bufOut.Update();
 906         bufErr.Update();
 907 #endif // wxUSE_STREAMS
 908
 909         // don't eat 100% of the CPU -- ugly but anything else requires
 910         // real async IO which we don't have for the moment
 911         ::Sleep(50);
 912
 913         // we must process messages or we'd never get wxWM_PROC_TERMINATED
 914         traits->AlwaysYield();
 915     }
 916
 917     if ( !(flags & wxEXEC_NODISABLE) )
 918     {
 919         // reenable disabled windows back
 920         traits->AfterChildWaitLoop(cookie);
 921     }
 922
 923     DWORD dwExitCode = data->dwExitCode;
 924     delete data;
 925
 926     // return the exit code
 927     return dwExitCode;
 928 }
 929
 930 long wxExecute(wxChar **argv, int flags, wxProcess *handler)
 931 {
 932     wxString command;
 933
 934     for ( ;; )
 935     {
 936         command += *argv++;
 937         if ( !*argv )
 938             break;
 939
 940         command += _T(' ');
 941     }
 942
 943     return wxExecute(command, flags, handler);
 944 }
 945