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process.h
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C/C++ Source or Header
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2002-08-31
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/////////////////////////////////////////////////////////////////////////////
// Name: process.h
// Purpose: wxProcess class
// Author: Guilhem Lavaux
// Modified by: Vadim Zeitlin to check error codes, added Detach() method
// Created: 24/06/98
// RCS-ID: $Id: process.h,v 1.21 2002/08/31 11:29:11 GD Exp $
// Copyright: (c) 1998 Guilhem Lavaux
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_PROCESSH__
#define _WX_PROCESSH__
#if defined(__GNUG__) && !defined(__APPLE__)
#pragma interface "process.h"
#endif
#include "wx/event.h"
#if wxUSE_STREAMS
#include "wx/stream.h"
#endif
#include "wx/utils.h" // for wxSignal
// the wxProcess creation flags
enum
{
// no redirection
wxPROCESS_DEFAULT = 0,
// redirect the IO of the child process
wxPROCESS_REDIRECT = 1
};
// ----------------------------------------------------------------------------
// A wxProcess object should be passed to wxExecute - than its OnTerminate()
// function will be called when the process terminates.
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxProcess : public wxEvtHandler
{
public:
// kill the process with the given PID
static wxKillError Kill(int pid, wxSignal sig = wxSIGTERM);
// test if the given process exists
static bool Exists(int pid);
// this function replaces the standard popen() one: it launches a process
// asynchronously and allows the caller to get the streams connected to its
// std{in|out|err}
//
// on error NULL is returned, in any case the process object will be
// deleted automatically when the process terminates and should *not* be
// deleted by the caller
static wxProcess *Open(const wxString& cmd, int flags = wxEXEC_ASYNC);
// ctors
wxProcess(wxEvtHandler *parent = (wxEvtHandler *) NULL, int id = -1)
{ Init(parent, id, wxPROCESS_DEFAULT); }
wxProcess(int flags) { Init(NULL, -1, flags); }
virtual ~wxProcess();
// may be overridden to be notified about process termination
virtual void OnTerminate(int pid, int status);
// call this before passing the object to wxExecute() to redirect the
// launched process stdin/stdout, then use GetInputStream() and
// GetOutputStream() to get access to them
void Redirect() { m_redirect = TRUE; }
bool IsRedirected() const { return m_redirect; }
// detach from the parent - should be called by the parent if it's deleted
// before the process it started terminates
void Detach();
#if wxUSE_STREAMS
// Pipe handling
wxInputStream *GetInputStream() const { return m_inputStream; }
wxInputStream *GetErrorStream() const { return m_errorStream; }
wxOutputStream *GetOutputStream() const { return m_outputStream; }
// close the output stream indicating that nothing more will be written
void CloseOutput() { delete m_outputStream; m_outputStream = NULL; }
// return TRUE if the child process stdout is not closed
bool IsInputOpened() const;
// return TRUE if any input is available on the child process stdout/err
bool IsInputAvailable() const;
bool IsErrorAvailable() const;
// implementation only (for wxExecute)
//
// NB: the streams passed here should correspond to the child process
// stdout, stdin and stderr and here the normal naming convention is
// used unlike elsewhere in this class
void SetPipeStreams(wxInputStream *outStream,
wxOutputStream *inStream,
wxInputStream *errStream);
#endif // wxUSE_STREAMS
// for backwards compatibility only, don't use
#if WXWIN_COMPATIBILITY_2_2
wxProcess(wxEvtHandler *parent, bool redirect)
{ Init(parent, -1, redirect ? wxPROCESS_REDIRECT : wxPROCESS_DEFAULT); }
#endif // WXWIN_COMPATIBILITY_2_2
protected:
void Init(wxEvtHandler *parent, int id, int flags);
int m_id;
#if wxUSE_STREAMS
// these streams are connected to stdout, stderr and stdin of the child
// process respectively (yes, m_inputStream corresponds to stdout -- very
// confusing but too late to change now)
wxInputStream *m_inputStream,
*m_errorStream;
wxOutputStream *m_outputStream;
#endif // wxUSE_STREAMS
bool m_redirect;
DECLARE_DYNAMIC_CLASS(wxProcess)
};
// ----------------------------------------------------------------------------
// wxProcess events
// ----------------------------------------------------------------------------
BEGIN_DECLARE_EVENT_TYPES()
DECLARE_EVENT_TYPE(wxEVT_END_PROCESS, 440)
END_DECLARE_EVENT_TYPES()
class WXDLLEXPORT wxProcessEvent : public wxEvent
{
public:
wxProcessEvent(int id = 0, int pid = 0, int exitcode = 0) : wxEvent(id)
{
m_eventType = wxEVT_END_PROCESS;
m_pid = pid;
m_exitcode = exitcode;
}
// accessors
// PID of process which terminated
int GetPid() { return m_pid; }
// the exit code
int GetExitCode() { return m_exitcode; }
// implement the base class pure virtual
virtual wxEvent *Clone() const { return new wxProcessEvent(*this); }
public:
int m_pid,
m_exitcode;
DECLARE_DYNAMIC_CLASS(wxProcessEvent)
};
typedef void (wxEvtHandler::*wxProcessEventFunction)(wxProcessEvent&);
#define EVT_END_PROCESS(id, func) \
DECLARE_EVENT_TABLE_ENTRY( \
wxEVT_END_PROCESS, id, -1, \
(wxObjectEventFunction) \
(wxEventFunction) \
(wxProcessEventFunction) & func, NULL),
#endif
// _WX_PROCESSH__