// Name: process.h
// Purpose: interface of wxProcess
// Author: wxWidgets team
-// RCS-ID: $Id$
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-/**
- Signal constants used by wxProcess.
-*/
-enum wxSignal
-{
- wxSIGNONE = 0, //!< verify if the process exists under Unix
- wxSIGHUP,
- wxSIGINT,
- wxSIGQUIT,
- wxSIGILL,
- wxSIGTRAP,
- wxSIGABRT,
- wxSIGEMT,
- wxSIGFPE,
- wxSIGKILL, //!< forcefully kill, dangerous!
- wxSIGBUS,
- wxSIGSEGV,
- wxSIGSYS,
- wxSIGPIPE,
- wxSIGALRM,
- wxSIGTERM //!< terminate the process gently
-};
-
-/**
- Return values for wxProcess::Kill.
-*/
-enum wxKillError
-{
- wxKILL_OK, //!< no error
- wxKILL_BAD_SIGNAL, //!< no such signal
- wxKILL_ACCESS_DENIED, //!< permission denied
- wxKILL_NO_PROCESS, //!< no such process
- wxKILL_ERROR //!< another, unspecified error
-};
-
/**
@class wxProcess
notified about the process termination and also retrieve its exit status which is
unavailable from ::wxExecute() in the case of asynchronous execution.
- @note If the process termination notification is processed by the
- parent, it is responsible for deleting the wxProcess object which sent it.
- However, if it is not processed, the object will delete itself and so the
- library users should only delete those objects whose notifications have been
- processed (and call wxProcess::Detach for others).
+ @note
+ If the @c wxEVT_END_PROCESS event sent after termination is processed by the
+ parent, then it is responsible for deleting the wxProcess object which sent it.
+ However, if it is not processed, the object will <b>delete itself</b> and so the
+ library users should only delete those objects whose notifications have been
+ processed (and call wxProcess::Detach for others).
+ This also means that unless you're going to process the @c wxEVT_END_PROCESS event,
+ you <b>must</b> allocate the wxProcess class on the heap.
wxProcess also supports IO redirection of the child process. For this, you have
to call its Redirect() method before passing it to ::wxExecute().
and GetErrorStream() can then be used to retrieve the streams corresponding to the
child process standard output, input and error output respectively.
+ @beginEventEmissionTable{wxProcessEvent}
+ @event{EVT_END_PROCESS(id, func)}
+ Process a @c wxEVT_END_PROCESS event, sent by wxProcess::OnTerminate upon
+ the external process termination.
+ @endEventTable
+
@library{wxbase}
@category{appmanagement}
- @see wxExecute(), @ref page_samples_exec "exec sample"
+ @beginWxPerlOnly
+ In wxPerl this class has an additional @c Destroy method,
+ for explicit destruction.
+ @endWxPerlOnly
+
+ @see wxExecute(), @ref page_samples_exec
*/
class wxProcess : public wxEvtHandler
{
This function can be used to indicate to the child process that
there is no more data to be read - usually, a filter program will only
terminate when the input stream is closed.
+
+ Notice that GetOutputStream() will return @NULL after the output stream
+ is closed.
*/
void CloseOutput();
/**
+ Detaches this event handler from the parent specified in the constructor
+ (see wxEvtHandler::Unlink() for a similar but not identical function).
+
Normally, a wxProcess object is deleted by its parent when it receives the
- notification about the process termination. However, it might happen that the
- parent object is destroyed before the external process is terminated (e.g. a
- window from which this external process was launched is closed by the user)
- and in this case it @b should not delete the wxProcess object, but
- @b should call Detach() instead. After the wxProcess object is detached
- from its parent, no notification events will be sent to the parent and the
- object will delete itself upon reception of the process termination
- notification.
+ notification about the process termination.
+
+ However, it might happen that the parent object is destroyed before the external
+ process is terminated (e.g. a window from which this external process was launched
+ is closed by the user) and in this case it @b should not delete the wxProcess
+ object, but @b should call Detach() instead.
+
+ After the wxProcess object is detached from its parent, no notification events
+ will be sent to the parent and the object will delete itself upon reception of
+ the process termination notification.
*/
void Detach();
wxInputStream* GetInputStream() const;
/**
- It returns an output stream correspoding to the input stream of the subprocess.
- If it is @NULL, you have not turned on the redirection.
+ It returns an output stream corresponding to the input stream of the subprocess.
+
+ If it is @NULL, you have not turned on the redirection or already
+ called CloseOutput().
@see Redirect().
*/
wxOutputStream* GetOutputStream() const;
/**
- Returns the process ID of the process launched by Open().
+ Returns the process ID of the process launched by Open() or set by
+ wxExecute() (if you passed this wxProcess as argument).
*/
long GetPid() const;
/**
It is called when the process with the pid @a pid finishes.
It raises a wxWidgets event when it isn't overridden.
+
+ Note that this function won't be called if you Kill() the process.
@param pid
The pid of the process which has just terminated.
The caught output stream is returned by GetInputStream() as a non-seekable stream.
*/
void Redirect();
+
+ /**
+ Sets the priority of the process, between 0 (lowest) and 100 (highest).
+ It can only be set before the process is created.
+
+ The following symbolic constants can be used in addition to raw
+ values in 0..100 range:
+ - @b wxPRIORITY_MIN: 0
+ - @b wxPRIORITY_DEFAULT: 50
+ - @b wxPRIORITY_MAX: 100
+
+ @since 2.9.5
+ */
+ void SetPriority(unsigned priority);
};
/**
@class wxProcessEvent
- A process event is sent when a process is terminated.
+ A process event is sent to the wxEvtHandler specified to wxProcess
+ when a process is terminated.
@beginEventTable{wxProcessEvent}
@event{EVT_END_PROCESS(id, func)}
- Process a @c wxEVT_END_PROCESS event. @a id is the identifier of the process
- object (the id passed to the wxProcess constructor) or a window to receive
- the event.
+ Process a @c wxEVT_END_PROCESS event. @a id is the identifier of the process
+ object (the id passed to the wxProcess constructor) or a window to receive
+ the event.
@endEventTable
@library{wxbase}
int GetPid();
};
+
+wxEventType wxEVT_END_PROCESS;
+
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