include/wx/process.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        process.h
   3 // Purpose:     wxProcess class
   4 // Author:      Guilhem Lavaux
   5 // Modified by: Vadim Zeitlin to check error codes, added Detach() method
   6 // Created:     24/06/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Guilhem Lavaux
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_PROCESSH__
  13 #define _WX_PROCESSH__
  14
  15 #ifdef __GNUG__
  16     #pragma interface "process.h"
  17 #endif
  18
  19 #include "wx/event.h"
  20
  21 #if wxUSE_STREAMS
  22     #include "wx/stream.h"
  23 #endif
  24
  25 #include "wx/utils.h"       // for wxSignal
  26
  27 // the wxProcess creation flags
  28 enum
  29 {
  30     // no redirection
  31     wxPROCESS_DEFAULT = 0,
  32
  33     // redirect the IO of the child process
  34     wxPROCESS_REDIRECT = 1
  35 };
  36
  37 // ----------------------------------------------------------------------------
  38 // A wxProcess object should be passed to wxExecute - than its OnTerminate()
  39 // function will be called when the process terminates.
  40 // ----------------------------------------------------------------------------
  41
  42 class WXDLLEXPORT wxProcess : public wxEvtHandler
  43 {
  44 public:
  45     // kill the process with the given PID
  46     static wxKillError Kill(int pid, wxSignal sig = wxSIGTERM);
  47
  48     // test if the given process exists
  49     static bool Exists(int pid);
  50
  51     // this function replaces the standard popen() one: it launches a process
  52     // asynchronously and allows the caller to get the streams connected to its
  53     // std{in|out|err}
  54     //
  55     // on error NULL is returned, in any case the process object will be
  56     // deleted automatically when the process terminates and should *not* be
  57     // deleted by the caller
  58     static wxProcess *Open(const wxString& cmd, int flags = wxEXEC_ASYNC);
  59
  60
  61     // ctors
  62     wxProcess(wxEvtHandler *parent = (wxEvtHandler *) NULL, int id = -1)
  63         { Init(parent, id, wxPROCESS_DEFAULT); }
  64
  65     wxProcess(int flags) { Init(NULL, -1, flags); }
  66
  67     virtual ~wxProcess();
  68
  69     // may be overridden to be notified about process termination
  70     virtual void OnTerminate(int pid, int status);
  71
  72     // call this before passing the object to wxExecute() to redirect the
  73     // launched process stdin/stdout, then use GetInputStream() and
  74     // GetOutputStream() to get access to them
  75     void Redirect() { m_redirect = TRUE; }
  76     bool IsRedirected() const { return m_redirect; }
  77
  78     // detach from the parent - should be called by the parent if it's deleted
  79     // before the process it started terminates
  80     void Detach();
  81
  82 #if wxUSE_STREAMS
  83     // Pipe handling
  84     wxInputStream *GetInputStream() const { return m_inputStream; }
  85     wxInputStream *GetErrorStream() const { return m_errorStream; }
  86     wxOutputStream *GetOutputStream() const { return m_outputStream; }
  87
  88     // close the output stream indicating that nothing more will be written
  89     void CloseOutput() { delete m_outputStream; m_outputStream = NULL; }
  90
  91     // return TRUE if the child process stdout is not closed
  92     bool IsInputOpened() const;
  93
  94     // return TRUE if any input is available on the child process stdout/err
  95     bool IsInputAvailable() const;
  96     bool IsErrorAvailable() const;
  97
  98     // implementation only (for wxExecute)
  99     //
 100     // NB: the streams passed here should correspond to the child process
 101     //     stdout, stdin and stderr and here the normal naming convention is
 102     //     used unlike elsewhere in this class
 103     void SetPipeStreams(wxInputStream *outStream,
 104                         wxOutputStream *inStream,
 105                         wxInputStream *errStream);
 106 #endif // wxUSE_STREAMS
 107
 108     // for backwards compatibility only, don't use
 109 #if WXWIN_COMPATIBILITY_2_2
 110     wxProcess(wxEvtHandler *parent, bool redirect)
 111         { Init(parent, -1, redirect ? wxPROCESS_REDIRECT : wxPROCESS_DEFAULT); }
 112 #endif // WXWIN_COMPATIBILITY_2_2
 113
 114 protected:
 115     void Init(wxEvtHandler *parent, int id, int flags);
 116
 117     int m_id;
 118
 119 #if wxUSE_STREAMS
 120     // these streams are connected to stdout, stderr and stdin of the child
 121     // process respectively (yes, m_inputStream corresponds to stdout -- very
 122     // confusing but too late to change now)
 123     wxInputStream  *m_inputStream,
 124                    *m_errorStream;
 125     wxOutputStream *m_outputStream;
 126 #endif // wxUSE_STREAMS
 127
 128     bool m_redirect;
 129
 130     DECLARE_DYNAMIC_CLASS(wxProcess)
 131 };
 132
 133 // ----------------------------------------------------------------------------
 134 // wxProcess events
 135 // ----------------------------------------------------------------------------
 136
 137 BEGIN_DECLARE_EVENT_TYPES()
 138     DECLARE_EVENT_TYPE(wxEVT_END_PROCESS, 440)
 139 END_DECLARE_EVENT_TYPES()
 140
 141 class WXDLLEXPORT wxProcessEvent : public wxEvent
 142 {
 143 public:
 144     wxProcessEvent(int id = 0, int pid = 0, int exitcode = 0) : wxEvent(id)
 145     {
 146         m_eventType = wxEVT_END_PROCESS;
 147         m_pid = pid;
 148         m_exitcode = exitcode;
 149     }
 150
 151     // accessors
 152         // PID of process which terminated
 153     int GetPid() { return m_pid; }
 154
 155         // the exit code
 156     int GetExitCode() { return m_exitcode; }
 157
 158     // implement the base class pure virtual
 159     virtual wxEvent *Clone() const { return new wxProcessEvent(*this); }
 160
 161 public:
 162     int m_pid,
 163         m_exitcode;
 164
 165     DECLARE_DYNAMIC_CLASS(wxProcessEvent)
 166 };
 167
 168 typedef void (wxEvtHandler::*wxProcessEventFunction)(wxProcessEvent&);
 169
 170 #define EVT_END_PROCESS(id, func) \
 171    DECLARE_EVENT_TABLE_ENTRY( \
 172            wxEVT_END_PROCESS, id, -1, \
 173            (wxObjectEventFunction) \
 174            (wxEventFunction) \
 175            (wxProcessEventFunction) & func, NULL),
 176
 177 #endif
 178     // _WX_PROCESSH__