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 licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_PROCESSH__
  13 #define _WX_PROCESSH__
  14
  15 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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 WXDLLIMPEXP_BASE 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 nId = wxID_ANY)
  63         { Init(parent, nId, wxPROCESS_DEFAULT); }
  64
  65     wxProcess(int flags) { Init(NULL, wxID_ANY, 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, wxID_ANY, 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     DECLARE_NO_COPY_CLASS(wxProcess)
 132 };
 133
 134 // ----------------------------------------------------------------------------
 135 // wxProcess events
 136 // ----------------------------------------------------------------------------
 137
 138 BEGIN_DECLARE_EVENT_TYPES()
 139     DECLARE_EXPORTED_EVENT_TYPE(WXDLLIMPEXP_BASE, wxEVT_END_PROCESS, 440)
 140 END_DECLARE_EVENT_TYPES()
 141
 142 class WXDLLIMPEXP_BASE wxProcessEvent : public wxEvent
 143 {
 144 public:
 145     wxProcessEvent(int nId = 0, int pid = 0, int exitcode = 0) : wxEvent(nId)
 146     {
 147         m_eventType = wxEVT_END_PROCESS;
 148         m_pid = pid;
 149         m_exitcode = exitcode;
 150     }
 151
 152     // accessors
 153         // PID of process which terminated
 154     int GetPid() { return m_pid; }
 155
 156         // the exit code
 157     int GetExitCode() { return m_exitcode; }
 158
 159     // implement the base class pure virtual
 160     virtual wxEvent *Clone() const { return new wxProcessEvent(*this); }
 161
 162 public:
 163     int m_pid,
 164         m_exitcode;
 165
 166     DECLARE_DYNAMIC_CLASS_NO_ASSIGN(wxProcessEvent)
 167 };
 168
 169 typedef void (wxEvtHandler::*wxProcessEventFunction)(wxProcessEvent&);
 170
 171 #define EVT_END_PROCESS(id, func) \
 172    DECLARE_EVENT_TABLE_ENTRY( \
 173            wxEVT_END_PROCESS, id, wxID_ANY, \
 174            (wxObjectEventFunction) (wxEventFunction)  wxStaticCastEvent( wxProcessEventFunction, & func ), NULL),
 175
 176 #endif
 177     // _WX_PROCESSH__