X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/e5f679554c2ebc156e55929e083ee7612cbfe0ac..f94a81c084696210418b8709e8ab649a18465fa6:/src/msw/main.cpp

diff --git a/src/msw/main.cpp b/src/msw/main.cpp
index 173e046078..1967e0cff2 100644
--- a/src/msw/main.cpp
+++ b/src/msw/main.cpp
@@ -17,10 +17,6 @@
 // headers
 // ----------------------------------------------------------------------------
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-    #pragma implementation
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
@@ -93,7 +89,7 @@ extern int wxEntryReal(int& argc, wxChar **argv);
 #endif // __VISUALC__/!__VISUALC__
 
 // ----------------------------------------------------------------------------
-// wrapper wxEntry catching all Win32 exceptions occuring in a wx program
+// wrapper wxEntry catching all Win32 exceptions occurring in a wx program
 // ----------------------------------------------------------------------------
 
 // wrap real wxEntry in a try-except block to be able to call
@@ -251,7 +247,85 @@ int wxEntry(int& argc, wxChar **argv)
 
 #endif // wxUSE_BASE
 
-#if wxUSE_GUI
+#if wxUSE_GUI && defined(__WXMSW__)
+
+#if wxUSE_UNICODE && !defined(__WXWINCE__)
+    #define NEED_UNICODE_CHECK
+#endif
+
+#ifdef NEED_UNICODE_CHECK
+
+// check whether Unicode is available
+static bool wxIsUnicodeAvailable()
+{
+    static const wchar_t *ERROR_STRING = L"wxWidgets Fatal Error";
+
+    if ( wxGetOsVersion() != wxWINDOWS_NT )
+    {
+        // we need to be built with MSLU support
+#if !wxUSE_UNICODE_MSLU 
+        // note that we can use MessageBoxW() as it's implemented even under
+        // Win9x - OTOH, we can't use wxGetTranslation() because the file APIs
+        // used by wxLocale are not
+        ::MessageBox
+        (
+         NULL,
+         L"This program uses Unicode and requires Windows NT/2000/XP.\n"
+         L"\n"
+         L"Program aborted.",
+         ERROR_STRING,
+         MB_ICONERROR | MB_OK
+        );
+
+        return false;
+#else // wxUSE_UNICODE_MSLU
+        // and the MSLU DLL must also be available
+        HMODULE hmod = ::LoadLibraryA("unicows.dll");
+        if ( !hmod )
+        {
+            ::MessageBox
+            (
+             NULL,
+             L"This program uses Unicode and requires unicows.dll to work "
+             L"under current operating system.\n"
+             L"\n"
+             L"Please install unicows.dll and relaunch the program.",
+             ERROR_STRING,
+             MB_ICONERROR | MB_OK
+            );
+            return false;
+        }
+
+        // this is not really necessary but be tidy
+        ::FreeLibrary(hmod);
+
+        // finally do the last check: has unicows.lib initialized correctly?
+        hmod = ::LoadLibraryW(L"unicows.dll");
+        if ( !hmod )
+        {
+            ::MessageBox
+            (
+             NULL,
+             L"This program uses Unicode but is not using unicows.dll\n"
+             L"correctly and so cannot work under current operating system.\n"
+             L"Please contact the program author for an updated version.\n"
+             L"\n"
+             L"Program aborted.",
+             ERROR_STRING,
+             MB_ICONERROR | MB_OK
+            );
+
+            return false;
+        }
+
+        ::FreeLibrary(hmod);
+#endif // !wxUSE_UNICODE_MSLU
+    }
+
+    return true;
+}
+
+#endif // NEED_UNICODE_CHECK
 
 // ----------------------------------------------------------------------------
 // Windows-specific wxEntry
@@ -262,6 +336,15 @@ WXDLLEXPORT int wxEntry(HINSTANCE hInstance,
                         wxCmdLineArgType WXUNUSED(pCmdLine),
                         int nCmdShow)
 {
+    // the first thing to do is to check if we're trying to run an Unicode
+    // program under Win9x w/o MSLU emulation layer - if so, abort right now
+    // as it has no chance to work and has all chances to crash
+#ifdef NEED_UNICODE_CHECK
+    if ( !wxIsUnicodeAvailable() )
+        return -1;
+#endif // NEED_UNICODE_CHECK
+
+
     // remember the parameters Windows gave us
     wxSetInstance(hInstance);
     wxApp::m_nCmdShow = nCmdShow;
@@ -348,7 +431,7 @@ DllMain(HINSTANCE hModule, DWORD fdwReason, LPVOID WXUNUSED(lpReserved))
 
 #endif // !NOMAIN
 
-#endif // wxUSE_GUI
+#endif // wxUSE_GUI && __WXMSW__
 
 // ----------------------------------------------------------------------------
 // global HINSTANCE