fixed the wrong examples of CalcScrolled/UnscrolledPosition() usage

[wxWidgets.git] / docs / latex / wx / process.tex

diff --git a/docs/latex/wx/process.tex b/docs/latex/wx/process.tex
index ee84b0e404587c1a2ccfdbf3102afd3b06fb22c1..2994063100756b3b99866e98455656545475aee3 100644 (file)
--- a/docs/latex/wx/process.tex
+++ b/docs/latex/wx/process.tex
@@ -1,13 +1,41 @@
 \section{\class{wxProcess}}\label{wxprocess}
 
 \section{\class{wxProcess}}\label{wxprocess}
 

-This class contains a method which is invoked when a process finishes.
-It can raise a \helpref{wxProcessEvent}{wxprocessevent} if wxProcess::OnTerminate
-isn't overriden.
+The objects of this class are used in conjunction with the 
+\helpref{wxExecute}{wxexecute} function. When a wxProcess object is passed to
+wxExecute(), its \helpref{OnTerminate()}{wxprocessonterminate} 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.
+
+Please note that 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 \helpref{Detach()}{wxprocessdetach} for others).
+
+wxProcess also supports IO redirection of the child process. For this, you have
+to call its \helpref{Redirect}{wxprocessredirect} method before passing it to 
+\helpref{wxExecute}{wxexecute}. If the child process was launched successfully, 
+\helpref{GetInputStream}{wxprocessgetinputstream}, 
+\helpref{GetOutputStream}{wxprocessgetoutputstream} and 
+\helpref{GetErrorStream}{wxprocessgeterrorstream} can then be used to retrieve
+the streams corresponding to the child process stdandard output, input and
+error output respectively.

 
 \wxheading{Derived from}
 
 \helpref{wxEvtHandler}{wxevthandler}
 
 
 \wxheading{Derived from}
 
 \helpref{wxEvtHandler}{wxevthandler}
 

+\wxheading{Include files}
+
+<wx/process.h>
+
+\wxheading{See also}
+
+\helpref{wxExecute}{wxexecute}\\
+\helpref{exec sample}{sampleexec}
+

 \latexignore{\rtfignore{\wxheading{Members}}}
 
 \membersection{wxProcess::wxProcess}\label{wxprocessconstr}
 \latexignore{\rtfignore{\wxheading{Members}}}
 
 \membersection{wxProcess::wxProcess}\label{wxprocessconstr}


@@ -18,6 +46,10 @@ Constructs a process object. {\it id} is only used in the case you want to
 use wxWindows events. It identifies this object, or another window that will
 receive the event.
 
 use wxWindows events. It identifies this object, or another window that will
 receive the event.
 

+If the {\it parent} parameter is different from NULL, it will receive
+a wxEVT\_END\_PROCESS notification event (you should insert EVT\_END\_PROCESS
+macro in the event table of the parent to handle it) with the given {\it id}.
+

 \wxheading{Parameters}
 
 \docparam{parent}{The event handler parent.}
 \wxheading{Parameters}
 
 \docparam{parent}{The event handler parent.}


@@ -30,12 +62,131 @@ receive the event.
 
 Destroys the wxProcess object.
 
 
 Destroys the wxProcess object.
 

+\membersection{wxProcess::CloseOutput}\label{wxprocesscloseoutput}
+
+\func{void}{CloseOutput}{\void}
+
+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.
+
+\membersection{wxProcess::Detach}\label{wxprocessdetach}
+
+\func{void}{Detach}{\void}
+
+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 {\bf should not delete} the wxProcess object, but 
+{\bf 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.
+
+\membersection{wxProcess::GetErrorStream}\label{wxprocessgeterrorstream}
+
+\constfunc{wxInputStream* }{GetErrorStream}{\void}
+
+Returns an input stream which corresponds to the standard error output (stderr)
+of the child process.
+
+\membersection{wxProcess::GetInputStream}\label{wxprocessgetinputstream}
+
+\constfunc{wxInputStream* }{GetInputStream}{\void}
+
+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 \helpref{wxProcess::Redirect}{wxprocessredirect}.
+
+\membersection{wxProcess::GetOutputStream}\label{wxprocessgetoutputstream}
+
+\constfunc{wxOutputStream* }{GetOutputStream}{\void}
+
+It returns an output stream correspoding to the input stream of the subprocess.
+If it is NULL, you have not turned on the redirection.
+See \helpref{wxProcess::Redirect}{wxprocessredirect}.
+
+\membersection{wxProcess::Kill}\label{wxprocesskill}
+
+\func{static wxKillError}{Kill}{\param{int}{ pid}, \param{wxSignal}{ signal = wxSIGNONE}}
+
+Send the specified signal to the given process. Possible signal values are:
+
+\begin{verbatim}
+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
+};
+\end{verbatim}
+
+{\tt wxSIGNONE}, {\tt wxSIGKILL} and {\tt wxSIGTERM} have the same meaning
+under both Unix and Windows but all the other signals are equivalent to 
+{\tt wxSIGTERM} under Windows.
+
+Returns the element of {\tt wxKillError} enum:
+
+\begin{verbatim}
+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
+};
+\end{verbatim}
+
+\wxheading{See also}
+
+\helpref{wxProcess::Exists}{wxprocessexists},\rtfsp
+\helpref{wxKill}{wxkill},\rtfsp
+\helpref{Exec sample}{sampleexec}
+
+\membersection{wxProcess::Kill}\label{wxprocessexists}
+
+\func{static bool}{Exists}{\param{int}{ pid}}
+
+Returns {\tt TRUE} if the given process exists in the system.
+
+\wxheading{See also}
+
+\helpref{wxProcess::Kill}{wxprocesskill},\rtfsp
+\helpref{Exec sample}{sampleexec}
+

 \membersection{wxProcess::OnTerminate}\label{wxprocessonterminate}
 
 \membersection{wxProcess::OnTerminate}\label{wxprocessonterminate}
 

-\constfunc{void}{OnTerminate}{\param{int}{ pid}}
+\constfunc{void}{OnTerminate}{\param{int}{ pid}, \param{int}{ status}}

 
 It is called when the process with the pid {\it pid} finishes.
 
 It is called when the process with the pid {\it pid} finishes.

-It raises a wxWindows event when it isn't overriden.
+It raises a wxWindows event when it isn't overridden.
+
+\docparam{pid}{The pid of the process which has just terminated.}
+
+\docparam{status}{The exit code of the process.}
+
+\membersection{wxProcess::Redirect}\label{wxprocessredirect}
+
+\func{void}{Redirect}{\void}

 
 

-\docparam{pid}{The pid of the process which ends.}
+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.