synchronize GTK2 minimum version in docs

[wxWidgets.git] / include / wx / msw / private.h

diff --git a/include/wx/msw/private.h b/include/wx/msw/private.h
index 63010bf4c5709eaf1ee11171ad56b2da87edea39..6c10cfa60dd7ae5e7afbee8503b222b67e57e087 100644 (file)
--- a/include/wx/msw/private.h
+++ b/include/wx/msw/private.h
@@ -169,9 +169,9 @@ extern LONG APIENTRY _EXPORT
 
 // This one is a macro so that it can be tested with #ifdef, it will be
 // undefined if it cannot be implemented for a given compiler.
-// Vc++, bcc, dmc, ow, mingw, codewarrior (and rsxnt) have _get_osfhandle.
-// Cygwin has get_osfhandle. Others are currently unknown, e.g. Salford,
-// Intel, Visual Age.
+// Vc++, bcc, dmc, ow, mingw akk have _get_osfhandle() and Cygwin has
+// get_osfhandle. Others are currently unknown, e.g. Salford, Intel, Visual
+// Age.
 #if defined(__WXWINCE__)
     #define wxGetOSFHandle(fd) ((HANDLE)fd)
     #define wxOpenOSFHandle(h, flags) ((int)wxPtrToUInt(h))
@@ -181,8 +181,7 @@ extern LONG APIENTRY _EXPORT
    || defined(__BORLANDC__) \
    || defined(__DMC__) \
    || defined(__WATCOMC__) \
-   || defined(__MINGW32__) \
-   || (defined(__MWERKS__) && defined(__MSL__))
+   || defined(__MINGW32__)
     #define wxGetOSFHandle(fd) ((HANDLE)_get_osfhandle(fd))
     #define wxOpenOSFHandle(h, flags) (_open_osfhandle(wxPtrToUInt(h), flags))
     #define wx_fdopen _fdopen
@@ -219,6 +218,21 @@ 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"
@@ -418,8 +432,9 @@ 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; }
 
@@ -781,7 +796,7 @@ public:
     {
         if ( IsRegistered() )
         {
-            if ( !::UnregisterClass(m_clsname.wx_str(), wxGetInstance()) )
+            if ( !::UnregisterClass(m_clsname.t_str(), wxGetInstance()) )
             {
                 wxLogLastError(wxT("UnregisterClass"));
             }