319 lines
11 KiB
Objective-C
319 lines
11 KiB
Objective-C
/////////////////////////////////////////////////////////////////////////////
|
|
// Name: process.h
|
|
// Purpose: interface of wxProcess
|
|
// Author: wxWidgets team
|
|
// Licence: wxWindows licence
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
/**
|
|
@class wxProcess
|
|
|
|
The objects of this class are used in conjunction with the ::wxExecute() function.
|
|
When a wxProcess object is passed to ::wxExecute(), its OnTerminate() virtual method
|
|
is called when the process terminates. This allows the program to be (asynchronously)
|
|
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 @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().
|
|
If the child process was launched successfully, GetInputStream(), GetOutputStream()
|
|
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}
|
|
|
|
@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
|
|
{
|
|
public:
|
|
/**
|
|
Constructs a process object. @a id is only used in the case you want to
|
|
use wxWidgets events. It identifies this object, or another window that will
|
|
receive the event.
|
|
|
|
If the @a parent parameter is different from @NULL, it will receive
|
|
a @c wxEVT_END_PROCESS notification event (you should insert @c EVT_END_PROCESS
|
|
macro in the event table of the parent to handle it) with the given @a id.
|
|
|
|
@param parent
|
|
The event handler parent.
|
|
@param id
|
|
id of an event.
|
|
*/
|
|
wxProcess(wxEvtHandler* parent = NULL, int id = -1);
|
|
|
|
/**
|
|
Creates an object without any associated parent (and hence no id neither)
|
|
but allows specifying the @a flags which can have the value of
|
|
@c wxPROCESS_DEFAULT or @c wxPROCESS_REDIRECT.
|
|
|
|
Specifying the former value has no particular effect while using the latter
|
|
one is equivalent to calling Redirect().
|
|
*/
|
|
wxProcess(int flags);
|
|
|
|
/**
|
|
Destroys the wxProcess object.
|
|
*/
|
|
virtual ~wxProcess();
|
|
|
|
/**
|
|
Activates a GUI process by bringing up its main window to the front.
|
|
|
|
This is a convenient method which tries to bring this process to the
|
|
users attention.
|
|
|
|
Currently this is implemented in wxMSW only and simply returns @false
|
|
under the other platforms. Notice that this function can also return
|
|
@false under MSW if, for example, the process doesn't have any windows.
|
|
|
|
@since 3.1.0
|
|
*/
|
|
bool Activate() const;
|
|
|
|
/**
|
|
Closes the output stream (the one connected to the stdin of the child
|
|
process).
|
|
|
|
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.
|
|
*/
|
|
void Detach();
|
|
|
|
/**
|
|
Returns @true if the given process exists in the system.
|
|
|
|
@see Kill(), @ref page_samples_exec "Exec sample"
|
|
*/
|
|
static bool Exists(int pid);
|
|
|
|
/**
|
|
Returns an input stream which corresponds to the standard error output (stderr)
|
|
of the child process.
|
|
*/
|
|
wxInputStream* GetErrorStream() const;
|
|
|
|
/**
|
|
It returns an input stream corresponding to the standard output stream of the
|
|
subprocess. If it is @NULL, you have not turned on the redirection.
|
|
|
|
@see Redirect().
|
|
*/
|
|
wxInputStream* GetInputStream() const;
|
|
|
|
/**
|
|
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() or set by
|
|
wxExecute() (if you passed this wxProcess as argument).
|
|
*/
|
|
long GetPid() const;
|
|
|
|
/**
|
|
Returns @true if there is data to be read on the child process standard
|
|
error stream.
|
|
|
|
@see IsInputAvailable()
|
|
*/
|
|
bool IsErrorAvailable() const;
|
|
|
|
/**
|
|
Returns @true if there is data to be read on the child process standard
|
|
output stream.
|
|
|
|
This allows writing simple (and extremely inefficient) polling-based code
|
|
waiting for a better mechanism in future wxWidgets versions.
|
|
See the @ref page_samples_exec "exec sample" for an example of using this
|
|
function.
|
|
|
|
@see IsInputOpened()
|
|
*/
|
|
bool IsInputAvailable() const;
|
|
|
|
/**
|
|
Returns @true if the child process standard output stream is opened.
|
|
*/
|
|
bool IsInputOpened() const;
|
|
|
|
/**
|
|
Send the specified signal to the given process. Possible signal values
|
|
can be one of the ::wxSignal enumeration values.
|
|
|
|
@c wxSIGNONE, @c wxSIGKILL and @c wxSIGTERM have the same meaning
|
|
under both Unix and Windows but all the other signals are equivalent to
|
|
@c wxSIGTERM under Windows.
|
|
|
|
The @a flags parameter can be @c wxKILL_NOCHILDREN (the default),
|
|
or @c wxKILL_CHILDREN, in which case the child processes of this
|
|
process will be killed too. Note that under Unix, for @c wxKILL_CHILDREN
|
|
to work you should have created the process passing @c wxEXEC_MAKE_GROUP_LEADER.
|
|
|
|
Returns the element of ::wxKillError enum.
|
|
|
|
@see Exists(), wxKill(), @ref page_samples_exec "Exec sample"
|
|
*/
|
|
static wxKillError Kill(int pid, wxSignal sig = wxSIGTERM,
|
|
int flags = wxKILL_NOCHILDREN);
|
|
|
|
/**
|
|
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.
|
|
@param status
|
|
The exit code of the process.
|
|
*/
|
|
virtual void OnTerminate(int pid, int status);
|
|
|
|
/**
|
|
This static method replaces the standard @c popen() function: it launches
|
|
the process specified by the @a cmd parameter and returns the wxProcess
|
|
object which can be used to retrieve the streams connected to the standard
|
|
input, output and error output of the child process.
|
|
|
|
If the process couldn't be launched, @NULL is returned.
|
|
|
|
@remarks
|
|
In any case the returned pointer should @b not be deleted, rather the process
|
|
object will be destroyed automatically when the child process terminates. This
|
|
does mean that the child process should be told to quit before the main program
|
|
exits to avoid memory leaks.
|
|
|
|
@param cmd
|
|
The command to execute, including optional arguments.
|
|
@param flags
|
|
The flags to pass to ::wxExecute().
|
|
Note: @c wxEXEC_SYNC should not be used.
|
|
|
|
@return A pointer to new wxProcess object or @NULL on error.
|
|
|
|
@see ::wxExecute()
|
|
*/
|
|
static wxProcess* Open(const wxString& cmd,
|
|
int flags = wxEXEC_ASYNC);
|
|
|
|
/**
|
|
Turns on redirection.
|
|
|
|
::wxExecute() will try to open a couple of pipes to catch the subprocess stdio.
|
|
The caught input stream is returned by GetOutputStream() as a non-seekable stream.
|
|
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 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.
|
|
@endEventTable
|
|
|
|
@library{wxbase}
|
|
@category{events}
|
|
|
|
@see wxProcess, @ref overview_events
|
|
*/
|
|
class wxProcessEvent : public wxEvent
|
|
{
|
|
public:
|
|
/**
|
|
Constructor.
|
|
|
|
Takes a wxProcessObject or window id, a process id and an exit status.
|
|
*/
|
|
wxProcessEvent(int id = 0, int pid = 0, int exitcode = 0);
|
|
|
|
/**
|
|
Returns the exist status.
|
|
*/
|
|
int GetExitCode() const;
|
|
|
|
/**
|
|
Returns the process id.
|
|
*/
|
|
int GetPid() const;
|
|
};
|
|
|
|
|
|
wxEventType wxEVT_END_PROCESS;
|
|
|