added and documented wxProcess::Is{Input|Error}Available() and IsInputOpened

[wxWidgets.git] / samples / exec / exec.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        exec.cpp
// Purpose:     exec sample demonstrates wxExecute and related functions
// Author:      Vadim Zeitlin
// Modified by:
// Created:     15.01.00
// RCS-ID:      $Id$
// Copyright:   (c) Vadim Zeitlin
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#ifdef __GNUG__
    #pragma implementation "exec.cpp"
    #pragma interface "exec.cpp"
#endif

// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

// for all others, include the necessary headers (this file is usually all you
// need because it includes almost all "standard" wxWindows headers
#ifndef WX_PRECOMP
    #include "wx/app.h"
    #include "wx/frame.h"

    #include "wx/utils.h"
    #include "wx/menu.h"

    #include "wx/msgdlg.h"
    #include "wx/textdlg.h"
    #include "wx/filedlg.h"
    #include "wx/choicdlg.h"

    #include "wx/button.h"
    #include "wx/textctrl.h"
    #include "wx/listbox.h"

    #include "wx/sizer.h"
#endif

#include "wx/txtstrm.h"

#include "wx/process.h"

#include "wx/mimetype.h"

#ifdef __WINDOWS__
    #include "wx/dde.h"
#endif // __WINDOWS__

// ----------------------------------------------------------------------------
// the usual application and main frame classes
// ----------------------------------------------------------------------------

// Define a new application type, each program should derive a class from wxApp
class MyApp : public wxApp
{
public:
    // override base class virtuals
    // ----------------------------

    // this one is called on application startup and is a good place for the app
    // initialization (doing it here and not in the ctor allows to have an error
    // return: if OnInit() returns false, the application terminates)
    virtual bool OnInit();
};

// Define an array of process pointers used by MyFrame
class MyPipedProcess;
WX_DEFINE_ARRAY(MyPipedProcess *, MyProcessesArray);

// Define a new frame type: this is going to be our main frame
class MyFrame : public wxFrame
{
public:
    // ctor(s)
    MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);

    // event handlers (these functions should _not_ be virtual)
    void OnQuit(wxCommandEvent& event);

    void OnKill(wxCommandEvent& event);

    void OnClear(wxCommandEvent& event);

    void OnSyncExec(wxCommandEvent& event);
    void OnAsyncExec(wxCommandEvent& event);
    void OnShell(wxCommandEvent& event);
    void OnExecWithRedirect(wxCommandEvent& event);
    void OnExecWithPipe(wxCommandEvent& event);

    void OnPOpen(wxCommandEvent& event);

    void OnFileExec(wxCommandEvent& event);

    void OnAbout(wxCommandEvent& event);

    // polling output of async processes
    void OnIdle(wxIdleEvent& event);

    // for MyPipedProcess
    void OnProcessTerminated(MyPipedProcess *process);
    wxListBox *GetLogListBox() const { return m_lbox; }

private:
    void ShowOutput(const wxString& cmd,
                    const wxArrayString& output,
                    const wxString& title);

    void DoAsyncExec(const wxString& cmd);

    // the PID of the last process we launched asynchronously
    long m_pidLast;

    // last command we executed
    wxString m_cmdLast;

#ifdef __WINDOWS__
    void OnDDEExec(wxCommandEvent& event);
    void OnDDERequest(wxCommandEvent& event);

    bool GetDDEServer();

    // last params of a DDE transaction
    wxString m_server,
             m_topic,
             m_cmdDde;
#endif // __WINDOWS__

    wxListBox *m_lbox;

    MyProcessesArray m_running;

    // any class wishing to process wxWindows events must use this macro
    DECLARE_EVENT_TABLE()
};

// ----------------------------------------------------------------------------
// MyPipeFrame: allows the user to communicate with the child process
// ----------------------------------------------------------------------------

class MyPipeFrame : public wxFrame
{
public:
    MyPipeFrame(wxFrame *parent,
                const wxString& cmd,
                wxProcess *process);

protected:
    void OnTextEnter(wxCommandEvent& event) { DoSend(); }
    void OnBtnSend(wxCommandEvent& event) { DoSend(); }
    void OnBtnGet(wxCommandEvent& event) { DoGet(); }

    void OnClose(wxCloseEvent& event);

    void DoSend() { m_out.WriteString(m_textIn->GetValue() + '\n'); DoGet(); }
    void DoGet();

private:
    wxProcess *m_process;

    wxTextInputStream m_in;
    wxTextOutputStream m_out;

    wxTextCtrl *m_textIn,
               *m_textOut;

    DECLARE_EVENT_TABLE()
};

// ----------------------------------------------------------------------------
// wxProcess-derived classes
// ----------------------------------------------------------------------------

// This is the handler for process termination events
class MyProcess : public wxProcess
{
public:
    MyProcess(MyFrame *parent, const wxString& cmd)
        : wxProcess(parent), m_cmd(cmd)
    {
        m_parent = parent;
    }

    // instead of overriding this virtual function we might as well process the
    // event from it in the frame class - this might be more convenient in some
    // cases
    virtual void OnTerminate(int pid, int status);

protected:
    MyFrame *m_parent;
    wxString m_cmd;
};

// A specialization of MyProcess for redirecting the output
class MyPipedProcess : public MyProcess
{
public:
    MyPipedProcess(MyFrame *parent, const wxString& cmd)
        : MyProcess(parent, cmd)
        {
            Redirect();
        }

    virtual void OnTerminate(int pid, int status);

    virtual bool HasInput();
};

// A version of MyPipedProcess which also sends input to the stdin of the
// child process
class MyPipedProcess2 : public MyPipedProcess
{
public:
    MyPipedProcess2(MyFrame *parent, const wxString& cmd, const wxString& input)
        : MyPipedProcess(parent, cmd), m_input(input)
        {
        }

    virtual bool HasInput();

private:
    wxString m_input;
};

// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------

// IDs for the controls and the menu commands
enum
{
    // menu items
    Exec_Quit = 100,
    Exec_Kill,
    Exec_ClearLog,
    Exec_SyncExec = 200,
    Exec_AsyncExec,
    Exec_Shell,
    Exec_POpen,
    Exec_OpenFile,
    Exec_DDEExec,
    Exec_DDERequest,
    Exec_Redirect,
    Exec_Pipe,
    Exec_About = 300,

    // control ids
    Exec_Btn_Send = 1000,
    Exec_Btn_Get
};

static const wxChar *DIALOG_TITLE = _T("Exec sample");

// ----------------------------------------------------------------------------
// event tables and other macros for wxWindows
// ----------------------------------------------------------------------------

// the event tables connect the wxWindows events with the functions (event
// handlers) which process them. It can be also done at run-time, but for the
// simple menu events like this the static method is much simpler.
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
    EVT_MENU(Exec_Quit,  MyFrame::OnQuit)
    EVT_MENU(Exec_Kill,  MyFrame::OnKill)
    EVT_MENU(Exec_ClearLog,  MyFrame::OnClear)

    EVT_MENU(Exec_SyncExec, MyFrame::OnSyncExec)
    EVT_MENU(Exec_AsyncExec, MyFrame::OnAsyncExec)
    EVT_MENU(Exec_Shell, MyFrame::OnShell)
    EVT_MENU(Exec_Redirect, MyFrame::OnExecWithRedirect)
    EVT_MENU(Exec_Pipe, MyFrame::OnExecWithPipe)

    EVT_MENU(Exec_POpen, MyFrame::OnPOpen)

    EVT_MENU(Exec_OpenFile, MyFrame::OnFileExec)

#ifdef __WINDOWS__
    EVT_MENU(Exec_DDEExec, MyFrame::OnDDEExec)
    EVT_MENU(Exec_DDERequest, MyFrame::OnDDERequest)
#endif // __WINDOWS__

    EVT_MENU(Exec_About, MyFrame::OnAbout)

    EVT_IDLE(MyFrame::OnIdle)
END_EVENT_TABLE()

BEGIN_EVENT_TABLE(MyPipeFrame, wxFrame)
    EVT_BUTTON(Exec_Btn_Send, MyPipeFrame::OnBtnSend)
    EVT_BUTTON(Exec_Btn_Get, MyPipeFrame::OnBtnGet)

    EVT_TEXT_ENTER(-1, MyPipeFrame::OnTextEnter)

    EVT_CLOSE(MyPipeFrame::OnClose)
END_EVENT_TABLE()

// Create a new application object: this macro will allow wxWindows to create
// the application object during program execution (it's better than using a
// static object for many reasons) and also declares the accessor function
// wxGetApp() which will return the reference of the right type (i.e. MyApp and
// not wxApp)
IMPLEMENT_APP(MyApp)

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// the application class
// ----------------------------------------------------------------------------

// `Main program' equivalent: the program execution "starts" here
bool MyApp::OnInit()
{
    // Create the main application window
    MyFrame *frame = new MyFrame(_T("Exec wxWindows sample"),
                                 wxDefaultPosition, wxSize(500, 140));

    // Show it and tell the application that it's our main window
    frame->Show(TRUE);
    SetTopWindow(frame);

    // success: wxApp::OnRun() will be called which will enter the main message
    // loop and the application will run. If we returned FALSE here, the
    // application would exit immediately.
    return TRUE;
}

// ----------------------------------------------------------------------------
// main frame
// ----------------------------------------------------------------------------

// frame constructor
MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
       : wxFrame((wxFrame *)NULL, -1, title, pos, size)
{
    m_pidLast = 0;

#ifdef __WXMAC__
    // we need this in order to allow the about menu relocation, since ABOUT is
    // not the default id of the about menu
    wxApp::s_macAboutMenuItemId = Exec_About;
#endif

    // create a menu bar
    wxMenu *menuFile = new wxMenu(_T(""), wxMENU_TEAROFF);
    menuFile->Append(Exec_Kill, _T("&Kill process...\tCtrl-K"),
                     _T("Kill a process by PID"));
    menuFile->AppendSeparator();
    menuFile->Append(Exec_ClearLog, _T("&Clear log\tCtrl-C"),
                     _T("Clear the log window"));
    menuFile->AppendSeparator();
    menuFile->Append(Exec_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));

    wxMenu *execMenu = new wxMenu;
    execMenu->Append(Exec_SyncExec, _T("Sync &execution...\tCtrl-E"),
                     _T("Launch a program and return when it terminates"));
    execMenu->Append(Exec_AsyncExec, _T("&Async execution...\tCtrl-A"),
                     _T("Launch a program and return immediately"));
    execMenu->Append(Exec_Shell, _T("Execute &shell command...\tCtrl-S"),
                     _T("Launch a shell and execute a command in it"));
    execMenu->AppendSeparator();
    execMenu->Append(Exec_Redirect, _T("Capture command &output...\tCtrl-O"),
                     _T("Launch a program and capture its output"));
    execMenu->Append(Exec_Pipe, _T("&Pipe through command..."),
                     _T("Pipe a string through a filter"));
    execMenu->Append(Exec_POpen, _T("&Open a pipe to a command...\tCtrl-P"),
                     _T("Open a pipe to and from another program"));

    execMenu->AppendSeparator();
    execMenu->Append(Exec_OpenFile, _T("Open &file...\tCtrl-F"),
                     _T("Launch the command to open this kind of files"));
#ifdef __WINDOWS__
    execMenu->AppendSeparator();
    execMenu->Append(Exec_DDEExec, _T("Execute command via &DDE...\tCtrl-D"));
    execMenu->Append(Exec_DDERequest, _T("Send DDE &request...\tCtrl-R"));
#endif

    wxMenu *helpMenu = new wxMenu(_T(""), wxMENU_TEAROFF);
    helpMenu->Append(Exec_About, _T("&About...\tF1"), _T("Show about dialog"));

    // now append the freshly created menu to the menu bar...
    wxMenuBar *menuBar = new wxMenuBar();
    menuBar->Append(menuFile, _T("&File"));
    menuBar->Append(execMenu, _T("&Exec"));
    menuBar->Append(helpMenu, _T("&Help"));

    // ... and attach this menu bar to the frame
    SetMenuBar(menuBar);

    // create the listbox in which we will show misc messages as they come
    m_lbox = new wxListBox(this, -1);
    wxFont font(12, wxFONTFAMILY_TELETYPE, wxFONTSTYLE_NORMAL,
                wxFONTWEIGHT_NORMAL);
    if ( font.Ok() )
        m_lbox->SetFont(font);

#if wxUSE_STATUSBAR
    // create a status bar just for fun (by default with 1 pane only)
    CreateStatusBar();
    SetStatusText(_T("Welcome to wxWindows exec sample!"));
#endif // wxUSE_STATUSBAR
}

// ----------------------------------------------------------------------------
// event handlers: file and help menu
// ----------------------------------------------------------------------------

void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
    // TRUE is to force the frame to close
    Close(TRUE);
}

void MyFrame::OnClear(wxCommandEvent& WXUNUSED(event))
{
    m_lbox->Clear();
}

void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
{