X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/2415cf6725d5cfb11f52d29e5d28dfdaa197b366..66c2bf7b1d9326fb650acfaae22ec50528cfbf7c:/include/wx/msw/private.h

diff --git a/include/wx/msw/private.h b/include/wx/msw/private.h
index 2875d294c7..0f966b841b 100644
--- a/include/wx/msw/private.h
+++ b/include/wx/msw/private.h
@@ -6,7 +6,6 @@
 // Author:      Julian Smart
 // Modified by:
 // Created:     01/02/97
-// RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
@@ -218,6 +217,21 @@ struct WinStruct : public T
 };
 
 
+// Macros for converting wxString to the type expected by API functions.
+//
+// Normally it is enough to just use wxString::t_str() which is implicitly
+// convertible to LPCTSTR, but in some cases an explicit conversion is required.
+//
+// In such cases wxMSW_CONV_LPCTSTR() should be used. But if an API function
+// takes a non-const pointer, wxMSW_CONV_LPTSTR() which casts away the
+// constness (but doesn't make it possible to really modify the returned
+// pointer, of course) should be used. And if a string is passed as LPARAM, use
+// wxMSW_CONV_LPARAM() which does the required ugly reinterpret_cast<> too.
+#define wxMSW_CONV_LPCTSTR(s) static_cast<const wxChar *>((s).t_str())
+#define wxMSW_CONV_LPTSTR(s) const_cast<wxChar *>(wxMSW_CONV_LPCTSTR(s))
+#define wxMSW_CONV_LPARAM(s) reinterpret_cast<LPARAM>(wxMSW_CONV_LPCTSTR(s))
+
+
 #if wxUSE_GUI
 
 #include "wx/gdicmn.h"
@@ -417,8 +431,9 @@ private:
 class WindowHDC
 {
 public:
+    WindowHDC() : m_hwnd(NULL), m_hdc(NULL) { }
     WindowHDC(HWND hwnd) { m_hdc = ::GetDC(m_hwnd = hwnd); }
-   ~WindowHDC() { ::ReleaseDC(m_hwnd, m_hdc); }
+   ~WindowHDC() { if ( m_hwnd && m_hdc ) { ::ReleaseDC(m_hwnd, m_hdc); } }
 
     operator HDC() const { return m_hdc; }
 
@@ -780,7 +795,7 @@ public:
     {
         if ( IsRegistered() )
         {
-            if ( !::UnregisterClass(m_clsname.wx_str(), wxGetInstance()) )
+            if ( !::UnregisterClass(m_clsname.t_str(), wxGetInstance()) )
             {
                 wxLogLastError(wxT("UnregisterClass"));
             }
@@ -916,7 +931,7 @@ enum wxWinVersion
 
 WXDLLIMPEXP_BASE wxWinVersion wxGetWinVersion();
 
-#if wxUSE_GUI
+#if wxUSE_GUI && defined(__WXMSW__)
 
 // cursor stuff
 extern HCURSOR wxGetCurrentBusyCursor();    // from msw/utils.cpp
@@ -1053,6 +1068,6 @@ inline void *wxSetWindowUserData(HWND hwnd, void *data)
 
 #endif // __WIN64__/__WIN32__
 
-#endif // wxUSE_GUI
+#endif // wxUSE_GUI && __WXMSW__
 
 #endif // _WX_PRIVATE_H_