Added wxMessageOutput as per the discussion on wx-dev.

Added wxApp::DoInit to initialize the global wxMessageOutput instance.
Changed wxCommandLineParser to use wxMessageOutput.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16267 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msgout.h

@@ -0,0 +1,78 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/msgout.h
+// Purpose:     wxMessageOutput class. Shows a message to the user
+// Author:      Mattia Barbon
+// Modified by:
+// Created:     17.07.02
+// RCS-ID:      $Id$
+// Copyright:   (c) wxWindows team
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_MSGOUT_H_
+#define _WX_MSGOUT_H_
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+#ifdef __GNUG__
+    #pragma interface "msgout.h"
+#endif
+
+#include "wx/defs.h"
+#include "wx/wxchar.h"
+
+class WXDLLEXPORT wxMessageOutput
+{
+public:
+    virtual ~wxMessageOutput() {};
+
+    // show a message to the user
+    virtual void Printf(const wxChar* format, ...)  ATTRIBUTE_PRINTF_2 = 0;
+    // gets the current wxMessageOutput object
+    static wxMessageOutput* Get();
+    // sets the global wxMessageOutput instance; returns the previous one
+    static wxMessageOutput* Set(wxMessageOutput* msgout);
+private:
+    static wxMessageOutput* ms_msgOut;
+};
+
+// sends output to stderr
+class WXDLLEXPORT wxMessageOutputStderr : public wxMessageOutput
+{
+public:
+    wxMessageOutputStderr() {};
+
+    virtual void Printf(const wxChar* format, ...) ATTRIBUTE_PRINTF_2;
+};
+
+#if wxUSE_GUI
+
+// shows output in a message box
+class WXDLLEXPORT wxMessageOutputMessageBox : public wxMessageOutput
+{
+public:
+    wxMessageOutputMessageBox() {};
+
+    virtual void Printf(const wxChar* format, ...) ATTRIBUTE_PRINTF_2;
+};
+
+#ifdef __WXMOTIF__
+
+// use wxLog; this is only required for wxMotif, so we put this code
+// inside wxUSE_GUI; it will work even without GUI
+class WXDLLEXPORT wxMessageOutputLog : public wxMessageOutput
+{
+public:
+    wxMessageOutputLog() {};
+
+    virtual void Printf(const wxChar* format, ...) ATTRIBUTE_PRINTF_2;
+};
+
+#endif // __WXMOTIF__
+
+#endif // wxUSE_GUI
+
+#endif
+    // _WX_MSGOUT_H_