include/wx/process.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/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 #include "wx/event.h"
  16
  17 #if wxUSE_STREAMS
  18     #include "wx/stream.h"
  19 #endif
  20
  21 #include "wx/utils.h"       // for wxSignal
  22
  23 // the wxProcess creation flags
  24 enum
  25 {
  26     // no redirection
  27     wxPROCESS_DEFAULT = 0,
  28
  29     // redirect the IO of the child process
  30     wxPROCESS_REDIRECT = 1
  31 };
  32
  33 // ----------------------------------------------------------------------------
  34 // A wxProcess object should be passed to wxExecute - than its OnTerminate()
  35 // function will be called when the process terminates.
  36 // ----------------------------------------------------------------------------
  37
  38 class WXDLLIMPEXP_BASE wxProcess : public wxEvtHandler
  39 {
  40 public:
  41     // kill the process with the given PID
  42     static wxKillError Kill(int pid, wxSignal sig = wxSIGTERM, int flags = wxKILL_NOCHILDREN);
  43
  44     // test if the given process exists
  45     static bool Exists(int pid);
  46
  47     // this function replaces the standard popen() one: it launches a process
  48     // asynchronously and allows the caller to get the streams connected to its
  49     // std{in|out|err}
  50     //
  51     // on error NULL is returned, in any case the process object will be
  52     // deleted automatically when the process terminates and should *not* be
  53     // deleted by the caller
  54     static wxProcess *Open(const wxString& cmd, int flags = wxEXEC_ASYNC);
  55
  56
  57     // ctors
  58     wxProcess(wxEvtHandler *parent = NULL, int nId = wxID_ANY)
  59         { Init(parent, nId, wxPROCESS_DEFAULT); }
  60
  61     wxProcess(int flags) { Init(NULL, wxID_ANY, flags); }
  62
  63     virtual ~wxProcess();
  64
  65     // get the process ID of the process executed by Open()
  66     long GetPid() const { return m_pid; }
  67
  68     // may be overridden to be notified about process termination
  69     virtual void OnTerminate(int pid, int status);
  70
  71     // call this before passing the object to wxExecute() to redirect the
  72     // launched process stdin/stdout, then use GetInputStream() and
  73     // GetOutputStream() to get access to them
  74     void Redirect() { m_redirect = true; }
  75     bool IsRedirected() const { return m_redirect; }
  76
  77     // detach from the parent - should be called by the parent if it's deleted
  78     // before the process it started terminates
  79     void Detach();
  80
  81 #if wxUSE_STREAMS
  82     // Pipe handling
  83     wxInputStream *GetInputStream() const { return m_inputStream; }
  84     wxInputStream *GetErrorStream() const { return m_errorStream; }
  85     wxOutputStream *GetOutputStream() const { return m_outputStream; }
  86
  87     // close the output stream indicating that nothing more will be written
  88     void CloseOutput() { delete m_outputStream; m_outputStream = NULL; }
  89
  90     // return true if the child process stdout is not closed
  91     bool IsInputOpened() const;
  92
  93     // return true if any input is available on the child process stdout/err
  94     bool IsInputAvailable() const;
  95     bool IsErrorAvailable() const;
  96
  97     // implementation only (for wxExecute)
  98     //
  99     // NB: the streams passed here should correspond to the child process
 100     //     stdout, stdin and stderr and here the normal naming convention is
 101     //     used unlike elsewhere in this class
 102     void SetPipeStreams(wxInputStream *outStream,
 103                         wxOutputStream *inStream,
 104                         wxInputStream *errStream);
 105 #endif // wxUSE_STREAMS
 106
 107 protected:
 108     void Init(wxEvtHandler *parent, int id, int flags);
 109     void SetPid(long pid) { m_pid = pid; }
 110
 111     int m_id;
 112     long m_pid;
 113
 114 #if wxUSE_STREAMS
 115     // these streams are connected to stdout, stderr and stdin of the child
 116     // process respectively (yes, m_inputStream corresponds to stdout -- very
 117     // confusing but too late to change now)
 118     wxInputStream  *m_inputStream,
 119                    *m_errorStream;
 120     wxOutputStream *m_outputStream;
 121 #endif // wxUSE_STREAMS
 122
 123     bool m_redirect;
 124
 125     DECLARE_DYNAMIC_CLASS(wxProcess)
 126     DECLARE_NO_COPY_CLASS(wxProcess)
 127 };
 128
 129 // ----------------------------------------------------------------------------
 130 // wxProcess events
 131 // ----------------------------------------------------------------------------
 132
 133 class WXDLLIMPEXP_FWD_BASE wxProcessEvent;
 134
 135 wxDECLARE_EXPORTED_EVENT( WXDLLIMPEXP_BASE, wxEVT_END_PROCESS, wxProcessEvent )
 136
 137 class WXDLLIMPEXP_BASE wxProcessEvent : public wxEvent
 138 {
 139 public:
 140     wxProcessEvent(int nId = 0, int pid = 0, int exitcode = 0) : wxEvent(nId)
 141     {
 142         m_eventType = wxEVT_END_PROCESS;
 143         m_pid = pid;
 144         m_exitcode = exitcode;
 145     }
 146
 147     // accessors
 148         // PID of process which terminated
 149     int GetPid() { return m_pid; }
 150
 151         // the exit code
 152     int GetExitCode() { return m_exitcode; }
 153
 154     // implement the base class pure virtual
 155     virtual wxEvent *Clone() const { return new wxProcessEvent(*this); }
 156
 157 public:
 158     int m_pid,
 159         m_exitcode;
 160
 161     DECLARE_DYNAMIC_CLASS_NO_ASSIGN(wxProcessEvent)
 162 };
 163
 164 typedef void (wxEvtHandler::*wxProcessEventFunction)(wxProcessEvent&);
 165
 166 #define wxProcessEventHandler(func) \
 167     wxEVENT_HANDLER_CAST(wxProcessEventFunction, func)
 168
 169 #define EVT_END_PROCESS(id, func) \
 170    wx__DECLARE_EVT1(wxEVT_END_PROCESS, id, wxProcessEventHandler(func))
 171
 172 #endif // _WX_PROCESSH__