X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/9cfc7f4f68ab77a02cd855bf3ed1f88283af7d75..04aa748dc4ce9d11cf7044255e17db574cad8a75:/src/msw/timer.cpp

diff --git a/src/msw/timer.cpp b/src/msw/timer.cpp
index cbe60a28fb..48d24f04d0 100644
--- a/src/msw/timer.cpp
+++ b/src/msw/timer.cpp
@@ -27,6 +27,7 @@
     #include "wx/intl.h"
     #include "wx/log.h"
     #include "wx/hashmap.h"
+    #include "wx/module.h"
 #endif
 
 #include "wx/msw/private.h"
@@ -53,7 +54,7 @@ static wxTimerMap& TimerMap()
 // ----------------------------------------------------------------------------
 // private functions
 // ----------------------------------------------------------------------------
-  
+
 LRESULT APIENTRY _EXPORT wxTimerWndProc(HWND hWnd, UINT message,
                                         WPARAM wParam, LPARAM lParam);
 
@@ -121,6 +122,11 @@ bool wxMSWTimerImpl::Start(int milliseconds, bool oneShot)
     // check that SetTimer() didn't reuse an existing id: according to the MSDN
     // this can happen and this would be catastrophic to us as we rely on ids
     // uniquely identifying the timers because we use them as keys in the hash
+    //
+    // notice that this also happens if the same id is reused for multiple
+    // timers: this used to work in previous versions but was never supported
+    // and absolutely shouldn't be done, use wxID_ANY to assign an id to the
+    // timer automatically or ensure that all your timers have unique ids
     if ( TimerMap().find(m_id) != TimerMap().end() )
     {
         wxLogError(_("Timer creation failed."));
@@ -191,8 +197,10 @@ const wxChar *wxTimerHiddenWindowModule::ms_className = NULL;
 
 bool wxTimerHiddenWindowModule::OnInit()
 {
-    ms_hwnd = NULL;
-    ms_className = NULL;
+    // do not initialize ms_hwnd to ms_className to NULL here: it may happen
+    // that our GetHWND() is called before the modules are initialized if a
+    // timer is created from wxApp-derived class ctor and in this case we
+    // shouldn't overwrite it
 
     return true;
 }