No changes, just extract wxCreateHiddenWindow() declaration in a header.

Add wx/msw/private/hiddenwin.h with wxCreateHiddenWindow() declaration instead
of declaring it manually in all the files using it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69170 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/private/hiddenwin.h

@@ -0,0 +1,31 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/msw/private/hiddenwin.h
+// Purpose:     Helper for creating a hidden window used by wxMSW internally.
+// Author:      Vadim Zeitlin
+// Created:     2011-09-16
+// RCS-ID:      $Id: wxhead.h,v 1.12 2010-04-22 12:44:51 zeitlin Exp $
+// Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_MSW_PRIVATE_HIDDENWIN_H_
+#define _WX_MSW_PRIVATE_HIDDENWIN_H_
+
+#include "wx/msw/private.h"
+
+/*
+  Creates a hidden window with supplied window proc registering the class for
+  it if necessary (i.e. the first time only). Caller is responsible for
+  destroying the window and unregistering the class (note that this must be
+  done because wxWidgets may be used as a DLL and so may be loaded/unloaded
+  multiple times into/from the same process so we can't rely on automatic
+  Windows class unregistration).
+
+  pclassname is a pointer to a caller stored classname, which must initially be
+  NULL. classname is the desired wndclass classname. If function successfully
+  registers the class, pclassname will be set to classname.
+ */
+extern "C" WXDLLIMPEXP_BASE HWND
+wxCreateHiddenWindow(LPCTSTR *pclassname, LPCTSTR classname, WNDPROC wndproc);
+
+#endif // _WX_MSW_PRIVATE_HIDDENWIN_H_

src/msw/dialup.cpp

@@ -40,6 +40,7 @@
 #include "wx/generic/choicdgg.h"
 
 #include "wx/msw/private.h"
+#include "wx/msw/private/hiddenwin.h"
 #include "wx/dynlib.h"
 
 wxDEFINE_EVENT( wxEVT_DIALUP_CONNECTED, wxDialUpEvent );
@@ -66,10 +67,6 @@ wxDEFINE_EVENT( wxEVT_DIALUP_DISCONNECTED, wxDialUpEvent );
 #define INTERNET_CONNECTION_PROXY 4
 #endif
 
-// implemented in utils.cpp
-extern "C" WXDLLIMPEXP_BASE HWND
-wxCreateHiddenWindow(LPCTSTR *pclassname, LPCTSTR classname, WNDPROC wndproc);
-
 static const wxChar *
     wxMSWDIALUP_WNDCLASSNAME = wxT("_wxDialUpManager_Internal_Class");
 static const wxChar *gs_classForDialUpWindow = NULL;

src/msw/sockmsw.cpp

@@ -59,11 +59,9 @@ WX_DECLARE_HASH_MAP(int,bool,wxIntegerHash,wxIntegerEqual,SocketHash);
 #  pragma warning(default:4115) /* named type definition in parentheses */
 #endif
 
-#define CLASSNAME  TEXT("_wxSocket_Internal_Window_Class")
+#include "wx/msw/private/hiddenwin.h"
 
-/* implemented in utils.cpp */
-extern "C" WXDLLIMPEXP_BASE HWND
-wxCreateHiddenWindow(LPCTSTR *pclassname, LPCTSTR classname, WNDPROC wndproc);
+#define CLASSNAME  TEXT("_wxSocket_Internal_Window_Class")
 
 /* Maximum number of different wxSocket objects at a given time.
  * This value can be modified at will, but it CANNOT be greater

src/msw/timer.cpp

@@ -31,6 +31,7 @@
 #endif
 
 #include "wx/msw/private.h"
+#include "wx/msw/private/hiddenwin.h"
 
 // ----------------------------------------------------------------------------
 // private globals
@@ -76,11 +77,6 @@ UINT_PTR GetNewTimerId(wxMSWTimerImpl *t)
 LRESULT APIENTRY _EXPORT wxTimerWndProc(HWND hWnd, UINT message,
                                         WPARAM wParam, LPARAM lParam);
 
-// implemented in utils.cpp
-extern "C" WXDLLIMPEXP_BASE HWND
-wxCreateHiddenWindow(LPCTSTR *pclassname, LPCTSTR classname, WNDPROC wndproc);
-
-
 // ----------------------------------------------------------------------------
 // wxTimerHiddenWindowModule: used to manage the hidden window used for
 // catching timer messages (we need a module to ensure that the window is

src/msw/utils.cpp

@@ -41,6 +41,7 @@
 #include "wx/confbase.h"        // for wxExpandEnvVars()
 
 #include "wx/msw/private.h"     // includes <windows.h>
+#include "wx/msw/private/hiddenwin.h"
 #include "wx/msw/missing.h"     // for CHARSET_HANGUL
 
 #if defined(__CYGWIN__)
@@ -1724,18 +1725,6 @@ extern long wxCharsetToCodepage(const char *name)
 
 #endif // wxUSE_FONTMAP/!wxUSE_FONTMAP
 
-/*
-  Creates a hidden window with supplied window proc registering the class for
-  it if necesssary (i.e. the first time only). Caller is responsible for
-  destroying the window and unregistering the class (note that this must be
-  done because wxWidgets may be used as a DLL and so may be loaded/unloaded
-  multiple times into/from the same process so we cna't rely on automatic
-  Windows class unregistration).
-
-  pclassname is a pointer to a caller stored classname, which must initially be
-  NULL. classname is the desired wndclass classname. If function successfully
-  registers the class, pclassname will be set to classname.
- */
 extern "C" WXDLLIMPEXP_BASE HWND
 wxCreateHiddenWindow(LPCTSTR *pclassname, LPCTSTR classname, WNDPROC wndproc)
 {

src/msw/utilsexc.cpp

@@ -82,9 +82,7 @@
     #include "wx/dde.h"         // for WX_DDE hack in wxExecute
 #endif // wxUSE_IPC
 
-// implemented in utils.cpp
-extern "C" WXDLLIMPEXP_BASE HWND
-wxCreateHiddenWindow(LPCTSTR *pclassname, LPCTSTR classname, WNDPROC wndproc);
+#include "wx/msw/private/hiddenwin.h"
 
 // ----------------------------------------------------------------------------
 // constants