X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/a37d422a667124e4cb9c7413deda637d3b1926ec..b3dc8a3e61aae7356f89e169da8b27736602e637:/src/msw/app.cpp

diff --git a/src/msw/app.cpp b/src/msw/app.cpp
index 72d8437e63..7297d4c352 100644
--- a/src/msw/app.cpp
+++ b/src/msw/app.cpp
@@ -455,6 +455,96 @@ bool wxApp::RegisterWindowClasses()
     return TRUE;
 }
 
+// ---------------------------------------------------------------------------
+// UnregisterWindowClasses
+// ---------------------------------------------------------------------------
+
+bool wxApp::UnregisterWindowClasses()
+{
+    bool retval = TRUE;
+
+    // frame window class.
+    if ( !UnregisterClass(wxFrameClassName, wxhInstance) )
+    {
+        wxLogLastError(wxT("UnregisterClass(frame)"));
+
+        retval = FALSE;
+    }
+
+    // "no redraw" frame
+    if ( !UnregisterClass(wxFrameClassNameNoRedraw, wxhInstance) )
+    {
+        wxLogLastError(wxT("UnregisterClass(no redraw frame)"));
+
+        return FALSE;
+    }
+
+    // MDI frame window class.
+    if ( !UnregisterClass(wxMDIFrameClassName, wxhInstance) )
+    {
+        wxLogLastError(wxT("UnregisterClass(MDI parent)"));
+
+        retval = FALSE;
+    }
+
+    // "no redraw" MDI frame
+    if ( !UnregisterClass(wxMDIFrameClassNameNoRedraw, wxhInstance) )
+    {
+        wxLogLastError(wxT("UnregisterClass(no redraw MDI parent frame)"));
+
+        retval = FALSE;
+    }
+
+    // MDI child frame window class.
+    if ( !UnregisterClass(wxMDIChildFrameClassName, wxhInstance) )
+    {
+        wxLogLastError(wxT("UnregisterClass(MDI child)"));
+
+        retval = FALSE;
+    }
+
+    // "no redraw" MDI child frame
+    if ( !UnregisterClass(wxMDIChildFrameClassNameNoRedraw, wxhInstance) )
+    {
+        wxLogLastError(wxT("UnregisterClass(no redraw MDI child)"));
+
+        retval = FALSE;
+    }
+
+    // panel window class.
+    if ( !UnregisterClass(wxPanelClassName, wxhInstance) )
+    {
+        wxLogLastError(wxT("UnregisterClass(panel)"));
+
+        retval = FALSE;
+    }
+
+    // no redraw panel window class.
+    if ( !UnregisterClass(wxPanelClassNameNR, wxhInstance) )
+    {
+        wxLogLastError(wxT("UnregisterClass(no redraw panel)"));
+
+        retval = FALSE;
+    }
+
+    // canvas and textsubwindow class name
+    if ( !UnregisterClass(wxCanvasClassName, wxhInstance) )
+    {
+        wxLogLastError(wxT("UnregisterClass(canvas)"));
+
+        retval = FALSE;
+    }
+
+    if ( !UnregisterClass(wxCanvasClassNameNR, wxhInstance) )
+    {
+        wxLogLastError(wxT("UnregisterClass(no redraw canvas)"));
+
+        retval = FALSE;
+    }
+
+    return retval;
+}
+
 // ---------------------------------------------------------------------------
 // Convert Windows to argc, argv style
 // ---------------------------------------------------------------------------
@@ -600,6 +690,14 @@ void wxApp::CleanUp()
     ::OleUninitialize();
 #endif
 
+#ifdef WXMAKINGDLL
+    // for an EXE the classes are unregistered when it terminates but DLL may
+    // be loaded several times (load/unload/load) into the same process in
+    // which case the registration will fail after the first time if we don't
+    // unregister the classes now
+    UnregisterWindowClasses();
+#endif // WXMAKINGDLL
+
 #if wxUSE_CTL3D
     Ctl3dUnregister(wxhInstance);
 #endif
@@ -1058,12 +1156,12 @@ bool wxApp::ProcessMessage(WXMSG *wxmsg)
         // we need to find the dialog containing this control as
         // IsDialogMessage() just eats all the messages (i.e. returns TRUE for
         // them) if we call it for the control itself
-        while ( ::GetWindowLong(hwnd, GWL_STYLE) & WS_CHILD )
+        while ( hwnd && ::GetWindowLong(hwnd, GWL_STYLE) & WS_CHILD )
         {
             hwnd = ::GetParent(hwnd);
         }
 
-        return ::IsDialogMessage(hwnd, msg) != 0;
+        return hwnd && ::IsDialogMessage(hwnd, msg) != 0;
     }
 
 #if wxUSE_TOOLTIPS