f6bcfd974e
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@7748 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
131 lines
5.0 KiB
TeX
131 lines
5.0 KiB
TeX
\section{\class{wxProcess}}\label{wxprocess}
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The objects of this class are used in conjunction with
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\helpref{wxExecute}{wxexecute} function. When a wxProcess object is passed to
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wxExecute(), its \helpref{OnTerminate()}{wxprocessonterminate} virtual method
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is called when the process terminates. This allows the program to be
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(asynchronously) notified about the process termination and also retrieve its
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exit status which is unavailable from wxExecute() in the case of
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asynchronous execution.
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Please note that if the process termination notification is processed by the
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parent, it is responsible for deleting the wxProcess object which sent it.
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However, if it is not processed, the object will delete itself and so the
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library users should only delete those objects whose notifications have been
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processed (and call \helpref{Detach()}{wxprocessdetach} for others).
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wxProcess also supports IO redirection of the child process. For this, you have
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to call its \helpref{Redirect}{wxprocessredirect} method before passing it to
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\helpref{wxExecute}{wxexecute}. If the child process was launched successfully,
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\helpref{GetInputStream}{wxprocessgetinputstream},
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\helpref{GetOutputStream}{wxprocessgetoutputstream} and
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\helpref{GetErrorStream}{wxprocessgeterrorstream} can then be used to retrieve
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the streams corresponding to the child process stdandard output, input and
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error output respectively.
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\wxheading{Derived from}
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\helpref{wxEvtHandler}{wxevthandler}
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\wxheading{Include files}
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<wx/process.h>
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\wxheading{See also}
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\helpref{wxExecute}{wxexecute}\\
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\helpref{exec sample}{sampleexec}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxProcess::wxProcess}\label{wxprocessconstr}
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\func{}{wxProcess}{\param{wxEvtHandler *}{ parent = NULL}, \param{int}{ id = -1}}
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Constructs a process object. {\it id} is only used in the case you want to
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use wxWindows events. It identifies this object, or another window that will
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receive the event.
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If the {\it parent} parameter is different from NULL, it will receive
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a wxEVT\_END\_PROCESS notification event (you should insert EVT\_END\_PROCESS
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macro in the event table of the parent to handle it) with the given {\it id}.
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\wxheading{Parameters}
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\docparam{parent}{The event handler parent.}
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\docparam{id}{id of an event.}
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\membersection{wxProcess::\destruct{wxProcess}}
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\func{}{\destruct{wxProcess}}{\void}
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Destroys the wxProcess object.
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\membersection{wxProcess::CloseOutput}\label{wxprocesscloseoutput}
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\func{void}{CloseOutput}{\void}
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Closes the output stream (the one connected to the stdin of the child
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process). This function can be used to indicate to the child process that
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there is no more data to be read - usually, a filter program will only
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terminate when the input stream is closed.
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\membersection{wxProcess::Detach}\label{wxprocessdetach}
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\func{void}{Detach}{\void}
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Normally, a wxProcess object is deleted by its parent when it receives the
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notification about the process termination. However, it might happen that the
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parent object is destroyed before the external process is terminated (e.g. a
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window from which this external process was launched is closed by the user)
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and in this case it {\bf should not delete} the wxProcess object, but
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{\bf should call Detach()} instead. After the wxProcess object is detached
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from its parent, no notification events will be sent to the parent and the
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object will delete itself upon reception of the process termination
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notification.
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\membersection{wxProcess::GetErrorStream}\label{wxprocessgeterrorstream}
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\constfunc{wxInputStream* }{GetErrorStream}{\void}
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Returns an input stream which corresponds to the standard error output (stderr)
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of the child process.
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\membersection{wxProcess::GetInputStream}\label{wxprocessgetinputstream}
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\constfunc{wxInputStream* }{GetInputStream}{\void}
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It returns a output stream corresponding to the standard output stream of the
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subprocess. If it is NULL, you have not turned on the redirection.
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See \helpref{wxProcess::Redirect}{wxprocessredirect}.
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\membersection{wxProcess::GetOutputStream}\label{wxprocessgetoutputstream}
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\constfunc{wxOutputStream* }{GetOutputStream}{\void}
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It returns an output stream correspoding to the input stream of the subprocess.
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If it is NULL, you have not turned on the redirection.
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See \helpref{wxProcess::Redirect}{wxprocessredirect}.
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\membersection{wxProcess::OnTerminate}\label{wxprocessonterminate}
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\constfunc{void}{OnTerminate}{\param{int}{ pid}, \param{int}{ status}}
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It is called when the process with the pid {\it pid} finishes.
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It raises a wxWindows event when it isn't overridden.
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\docparam{pid}{The pid of the process which has just terminated.}
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\docparam{status}{The exit code of the process.}
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\membersection{wxProcess::Redirect}\label{wxprocessredirect}
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\func{void}{Redirect}{\void}
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It turns on the redirection, wxExecute will try to open a couple of pipes
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to catch the subprocess stdio. The caught input stream is returned by
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GetOutputStream() as a non-seekable stream. The caught output stream is returned
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by GetInputStream() as a non-seekable stream.
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