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[wxWidgets.git] / 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 #if defined(__GNUG__) && !defined(__APPLE__)
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__