src/msw/utilsexc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/utilsexec.cpp
   3 // Purpose:     Various utilities
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  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 #endif
  36
  37 #include "wx/log.h"
  38
  39 #ifdef __WIN32__
  40     #include "wx/process.h"
  41 #endif
  42
  43 #include "wx/msw/private.h"
  44
  45 #include <ctype.h>
  46
  47 #if !defined(__GNUWIN32__) && !defined(__WXWINE__) && !defined(__SALFORDC__)
  48     #include <direct.h>
  49 #ifndef __MWERKS__
  50     #include <dos.h>
  51 #endif
  52 #endif
  53
  54 #if defined(__GNUWIN32__) && !defined(__TWIN32__)
  55     #include <sys/unistd.h>
  56     #include <sys/stat.h>
  57 #endif
  58
  59 #if defined(__WIN32__) && !defined(__WXWINE__)
  60 #include <io.h>
  61
  62 #ifndef __GNUWIN32__
  63 #include <shellapi.h>
  64 #endif
  65 #endif
  66
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #ifndef __WATCOMC__
  71     #if !(defined(_MSC_VER) && (_MSC_VER > 800))
  72         #include <errno.h>
  73     #endif
  74 #endif
  75 #include <stdarg.h>
  76
  77 #if wxUSE_IPC
  78     #include "wx/dde.h"         // for WX_DDE hack in wxExecute
  79 #endif // wxUSE_IPC
  80
  81 // ----------------------------------------------------------------------------
  82 // constants
  83 // ----------------------------------------------------------------------------
  84
  85 // this message is sent when the process we're waiting for terminates
  86 #define wxWM_PROC_TERMINATED (WM_USER + 10000)
  87
  88 // ----------------------------------------------------------------------------
  89 // this module globals
  90 // ----------------------------------------------------------------------------
  91
  92 // we need to create a hidden window to receive the process termination
  93 // notifications and for this we need a (Win) class name for it which we will
  94 // register the first time it's needed
  95 static const wxChar *gs_classForHiddenWindow = NULL;
  96
  97 // ----------------------------------------------------------------------------
  98 // private types
  99 // ----------------------------------------------------------------------------
 100
 101 // structure describing the process we're being waiting for
 102 struct wxExecuteData
 103 {
 104 public:
 105     ~wxExecuteData()
 106     {
 107 #ifndef __WIN16__
 108         if ( !::CloseHandle(hProcess) )
 109         {
 110             wxLogLastError("CloseHandle(hProcess)");
 111         }
 112 #endif
 113     }
 114
 115     HWND       hWnd;          // window to send wxWM_PROC_TERMINATED to
 116     HANDLE     hProcess;      // handle of the process
 117     DWORD      dwProcessId;   // pid of the process
 118     wxProcess *handler;
 119     DWORD      dwExitCode;    // the exit code of the process
 120     bool       state;         // set to FALSE when the process finishes
 121 };
 122
 123 // ============================================================================
 124 // implementation
 125 // ============================================================================
 126
 127 #ifdef __WIN32__
 128 static DWORD wxExecuteThread(wxExecuteData *data)
 129 {
 130     WaitForSingleObject(data->hProcess, INFINITE);
 131
 132     // get the exit code
 133     if ( !GetExitCodeProcess(data->hProcess, &data->dwExitCode) )
 134     {
 135         wxLogLastError("GetExitCodeProcess");
 136     }
 137
 138     wxASSERT_MSG( data->dwExitCode != STILL_ACTIVE,
 139                   wxT("process should have terminated") );
 140
 141     // send a message indicating process termination to the window
 142     SendMessage(data->hWnd, wxWM_PROC_TERMINATED, 0, (LPARAM)data);
 143
 144     return 0;
 145 }
 146
 147 // window procedure of a hidden window which is created just to receive
 148 // the notification message when a process exits
 149 LRESULT APIENTRY _EXPORT wxExecuteWindowCbk(HWND hWnd, UINT message,
 150                                             WPARAM wParam, LPARAM lParam)
 151 {
 152     if ( message == wxWM_PROC_TERMINATED )
 153     {
 154         DestroyWindow(hWnd);    // we don't need it any more
 155
 156         wxExecuteData *data = (wxExecuteData *)lParam;
 157         if ( data->handler )
 158         {
 159             data->handler->OnTerminate((int)data->dwProcessId,
 160                                        (int)data->dwExitCode);
 161         }
 162
 163         if ( data->state )
 164         {
 165             // we're executing synchronously, tell the waiting thread
 166             // that the process finished
 167             data->state = 0;
 168         }
 169         else
 170         {
 171             // asynchronous execution - we should do the clean up
 172             delete data;
 173         }
 174
 175         return 0;
 176     }
 177     else
 178     {
 179         return DefWindowProc(hWnd, message, wParam, lParam);
 180     }
 181 }
 182 #endif // Win32
 183
 184 long wxExecute(const wxString& cmd, bool sync, wxProcess *handler)
 185 {
 186     wxCHECK_MSG( !!cmd, 0, wxT("empty command in wxExecute") );
 187
 188 #if wxUSE_IPC
 189     // DDE hack: this is really not pretty, but we need to allow this for
 190     // transparent handling of DDE servers in wxMimeTypesManager. Usually it
 191     // returns the command which should be run to view/open/... a file of the
 192     // given type. Sometimes, however, this command just launches the server
 193     // and an additional DDE request must be made to really open the file. To
 194     // keep all this well hidden from the application, we allow a special form
 195     // of command: WX_DDE:<command>:DDE_SERVER:DDE_TOPIC:DDE_COMMAND in which
 196     // case we execute just <command> and process the rest below
 197     wxString command, ddeServer, ddeTopic, ddeCommand;
 198     static const size_t lenDdePrefix = 7;   // strlen("WX_DDE:")
 199     if ( cmd.Left(lenDdePrefix) == _T("WX_DDE#") )
 200     {
 201         const wxChar *p = cmd.c_str() + 7;
 202         while ( *p && *p != _T('#') )
 203         {
 204             command += *p++;
 205         }
 206
 207         if ( *p )
 208         {
 209             // skip '#'
 210             p++;
 211         }
 212         else
 213         {
 214             wxFAIL_MSG(_T("invalid WX_DDE command in wxExecute"));
 215         }
 216
 217         while ( *p && *p != _T('#') )
 218         {
 219             ddeServer += *p++;
 220         }
 221
 222         if ( *p )
 223         {
 224             // skip '#'
 225             p++;
 226         }
 227         else
 228         {
 229             wxFAIL_MSG(_T("invalid WX_DDE command in wxExecute"));
 230         }
 231
 232         while ( *p && *p != _T('#') )
 233         {
 234             ddeTopic += *p++;
 235         }
 236
 237         if ( *p )
 238         {
 239             // skip '#'
 240             p++;
 241         }
 242         else
 243         {
 244             wxFAIL_MSG(_T("invalid WX_DDE command in wxExecute"));
 245         }
 246
 247         while ( *p )
 248         {
 249             ddeCommand += *p++;
 250         }
 251     }
 252     else
 253 #endif // wxUSE_IPC
 254     {
 255         // no DDE
 256         command = cmd;
 257     }
 258
 259 #if defined(__WIN32__) && !defined(__TWIN32__)
 260     // the old code is disabled because we really need a process handle
 261     // if we want to execute it asynchronously or even just get its
 262     // return code and for this we must use CreateProcess() and not
 263     // ShellExecute()
 264 #if 0
 265     // isolate command and arguments
 266     wxString commandName;
 267     bool insideQuotes = FALSE;
 268     const char *pc;
 269     for ( pc = command.c_str(); *pc != '\0'; pc++ )
 270     {
 271         switch ( *pc )
 272         {
 273             case ' ':
 274             case '\t':
 275                 if ( !insideQuotes )
 276                     break;
 277                 // fall through
 278
 279             case '"':
 280                 insideQuotes = !insideQuotes;
 281                 // fall through
 282
 283             default:
 284                 commandName += *pc;
 285                 continue;   // skip the next break
 286         }
 287
 288         // only reached for space not inside quotes
 289         break;
 290     }
 291
 292     wxString commandArgs = pc;
 293
 294     wxWindow *winTop = wxTheApp->GetTopWindow();
 295     HWND hwndTop = (HWND)(winTop ? winTop->GetHWND() : 0);
 296
 297     HANDLE result;
 298 #ifdef __GNUWIN32__
 299     result = ShellExecute(hwndTop,
 300                           (const wchar_t)"open",
 301                           (const wchar_t)commandName,
 302                           (const wchar_t)commandArgs,
 303                           (const wchar_t)NULL,
 304                           SW_SHOWNORMAL);
 305 #else // !GNUWIN32
 306     result = ShellExecute(hwndTop, "open", commandName,
 307                           commandArgs, NULL, SW_SHOWNORMAL);
 308 #endif // GNUWIN32
 309
 310     if ( ((long)result) <= 32 )
 311         wxLogSysError(_("Can't execute command '%s'"), command.c_str());
 312
 313     return result;
 314 #else // 1
 315
 316     // create the process
 317     STARTUPINFO si;
 318     wxZeroMemory(si);
 319
 320     si.cb = sizeof(si);
 321
 322     PROCESS_INFORMATION pi;
 323
 324     if ( ::CreateProcess(
 325                          NULL,       // application name (use only cmd line)
 326                          (wxChar *)command.c_str(),  // full command line
 327                          NULL,       // security attributes: defaults for both
 328                          NULL,       //   the process and its main thread
 329                          FALSE,      // don't inherit handles
 330                          CREATE_DEFAULT_ERROR_MODE |
 331                          CREATE_SUSPENDED,           // flags
 332                          NULL,       // environment (use the same)
 333                          NULL,       // current directory (use the same)
 334                          &si,        // startup info (unused here)
 335                          &pi         // process info
 336                         ) == 0 )
 337     {
 338         wxLogSysError(_("Execution of command '%s' failed"), command.c_str());
 339
 340         return 0;
 341     }
 342
 343     // register the class for the hidden window used for the notifications
 344     if ( !gs_classForHiddenWindow )
 345     {
 346         gs_classForHiddenWindow = _T("wxHiddenWindow");
 347
 348         WNDCLASS wndclass;
 349         wxZeroMemory(wndclass);
 350         wndclass.lpfnWndProc   = (WNDPROC)wxExecuteWindowCbk;
 351         wndclass.hInstance     = wxGetInstance();
 352         wndclass.lpszClassName = gs_classForHiddenWindow;
 353
 354         if ( !::RegisterClass(&wndclass) )
 355         {
 356             wxLogLastError("RegisterClass(hidden window)");
 357         }
 358     }
 359
 360     // create a hidden window to receive notification about process
 361     // termination
 362     HWND hwnd = ::CreateWindow(gs_classForHiddenWindow, NULL,
 363                                WS_OVERLAPPEDWINDOW,
 364                                0, 0, 0, 0, NULL,
 365                                (HMENU)NULL, wxGetInstance(), 0);
 366     wxASSERT_MSG( hwnd, wxT("can't create a hidden window for wxExecute") );
 367
 368     // Alloc data
 369     wxExecuteData *data = new wxExecuteData;
 370     data->hProcess    = pi.hProcess;
 371     data->dwProcessId = pi.dwProcessId;
 372     data->hWnd        = hwnd;
 373     data->state       = sync;
 374     if ( sync )
 375     {
 376         wxASSERT_MSG( !handler, wxT("wxProcess param ignored for sync execution") );
 377
 378         data->handler = NULL;
 379     }
 380     else
 381     {
 382         // may be NULL or not
 383         data->handler = handler;
 384     }
 385
 386     DWORD tid;
 387     HANDLE hThread = ::CreateThread(NULL,
 388                                     0,
 389                                     (LPTHREAD_START_ROUTINE)wxExecuteThread,
 390                                     (void *)data,
 391                                     0,
 392                                     &tid);
 393
 394     // resume process we created now - whether the thread creation succeeded or
 395     // not
 396     if ( ::ResumeThread(pi.hThread) == (DWORD)-1 )
 397     {
 398         // ignore it - what can we do?
 399         wxLogLastError("ResumeThread in wxExecute");
 400     }
 401
 402     // close unneeded handle
 403     if ( !::CloseHandle(pi.hThread) )
 404         wxLogLastError("CloseHandle(hThread)");
 405
 406     if ( !hThread )
 407     {
 408         wxLogLastError("CreateThread in wxExecute");
 409
 410         DestroyWindow(hwnd);
 411         delete data;
 412
 413         // the process still started up successfully...
 414         return pi.dwProcessId;
 415     }
 416
 417 #if wxUSE_IPC
 418     // second part of DDE hack: now establish the DDE conversation with the
 419     // just launched process
 420     if ( !!ddeServer )
 421     {
 422         wxDDEClient client;
 423         wxConnectionBase *conn = client.MakeConnection(_T(""),
 424                                                        ddeServer,
 425                                                        ddeTopic);
 426         if ( !conn || !conn->Execute(ddeCommand) )
 427         {
 428             wxLogError(_("Couldn't launch DDE server '%s'."), command.c_str());
 429         }
 430     }
 431 #endif // wxUSE_IPC
 432
 433     if ( !sync )
 434     {
 435         // clean up will be done when the process terminates
 436
 437         // return the pid
 438         return pi.dwProcessId;
 439     }
 440
 441     // waiting until command executed (disable everything while doing it)
 442 #if wxUSE_GUI
 443     wxBeginBusyCursor();
 444     wxEnableTopLevelWindows(FALSE);
 445 #endif // wxUSE_GUI
 446
 447     while ( data->state )
 448         wxYield();
 449
 450 #if wxUSE_GUI
 451     wxEnableTopLevelWindows(TRUE);
 452     wxEndBusyCursor();
 453 #endif // wxUSE_GUI
 454
 455     DWORD dwExitCode = data->dwExitCode;
 456     delete data;
 457
 458     // return the exit code
 459     return dwExitCode;
 460 #endif // 0/1
 461 #else // Win16
 462     long instanceID = WinExec((LPCSTR) WXSTRINGCAST command, SW_SHOW);
 463     if (instanceID < 32) return(0);
 464
 465     if (sync) {
 466         int running;
 467         do {
 468             wxYield();
 469             running = GetModuleUsage((HINSTANCE)instanceID);
 470         } while (running);
 471     }
 472
 473     return(instanceID);
 474 #endif // Win16/32
 475 }
 476
 477 long wxExecute(char **argv, bool sync, wxProcess *handler)
 478 {
 479     wxString command;
 480
 481     while ( *argv != NULL )
 482     {
 483         command << *argv++ << ' ';
 484     }
 485
 486     command.RemoveLast();
 487
 488     return wxExecute(command, sync, handler);
 489 }
 490
 491 // ----------------------------------------------------------------------------
 492 // Metafile helpers
 493 // ----------------------------------------------------------------------------
 494
 495 extern void PixelToHIMETRIC(LONG *x, LONG *y)
 496 {
 497     ScreenHDC hdcRef;
 498
 499     int iWidthMM = GetDeviceCaps(hdcRef, HORZSIZE),
 500         iHeightMM = GetDeviceCaps(hdcRef, VERTSIZE),
 501         iWidthPels = GetDeviceCaps(hdcRef, HORZRES),
 502         iHeightPels = GetDeviceCaps(hdcRef, VERTRES);
 503
 504     *x *= (iWidthMM * 100);
 505     *x /= iWidthPels;
 506     *y *= (iHeightMM * 100);
 507     *y /= iHeightPels;
 508 }
 509
 510 extern void HIMETRICToPixel(LONG *x, LONG *y)
 511 {
 512     ScreenHDC hdcRef;
 513
 514     int iWidthMM = GetDeviceCaps(hdcRef, HORZSIZE),
 515         iHeightMM = GetDeviceCaps(hdcRef, VERTSIZE),
 516         iWidthPels = GetDeviceCaps(hdcRef, HORZRES),
 517         iHeightPels = GetDeviceCaps(hdcRef, VERTRES);
 518
 519     *x *= iWidthPels;
 520     *x /= (iWidthMM * 100);
 521     *y *= iHeightPels;
 522     *y /= (iHeightMM * 100);
 523 }