CheckDXVersion() relies on Unicode

CheckDXVersion () among two other functions relies on Unicode strings so it can not be compiled with it off. Might as well make Unicode mandatory that way.

If you want to use the Multi-Byte set in favour of Unicode, I'm including a hack to do it below. Please note that it is a hack and it doesn't work with Unicode.

ScreenshotD3D.cpp @ Line 154
Change:

GFXD3DX.D3DXSaveSurfaceToFileW( dT( "testScreen.png" ), D3DXIFF_PNG, surface, NULL, NULL );

Into:

GFXD3DX.D3DXSaveSurfaceToFile( "testScreen.png", D3DXIFF_PNG, surface, NULL, NULL );

Inside gfxD3DDevice.cpp. Replace GFXD3DDevice::getDXVersion() with this:

char * GFXD3DDevice::getDXVersion()
{
#ifdef UNICODE
   UTF16 dxVersionLetter;
#else
   char dxVersionLetter;
#endif

   static char dxVersionString[32];

   DWORD dxVersion, dxRevision;

   NVDXDiagWrapper::DXDiagNVUtil * dxDiag = new NVDXDiagWrapper::DXDiagNVUtil();
   dxDiag->InitIDxDiagContainer();
   dxDiag->GetDirectXVersion( &dxVersion, &dxRevision, &dxVersionLetter );
   dxDiag->FreeIDxDiagContainer();
   delete dxDiag;

#ifdef UNICODE
   convertUTF16toUTF8( &dxVersionLetter, (UTF8 *)&versionLetter, sizeof(versionLetter) );
#endif

   dSprintf( dxVersionString, sizeof(dxVersionString), "%d.%d%c", dxVersion, dxRevision, dxVersionLetter );

   return dxVersionString;
}

Finally, add this include in dxVersionChecker.cpp:

#include "platformWin32/platformWin32.h"

And replace checkDXVersion() with this:

bool checkDXVersion()
{
   // Init the strings and such
   initVersionStrings( D3DXDLL_VER );

   DWORD dwVersion = 0;

   // call dx version check supplied by the SDK sample
   HRESULT hr = GetDXVersion( &dwVersion, 0, 0 );

   // If there is a dx version, check the version against the desired DLL 
   // version and deal with it.
   if( SUCCEEDED( hr ) )
   {
      char cPath[_MAX_PATH] = { 0 }, cFilename[_MAX_PATH] = { 0 };

      GetWindowsDirectory( cPath, _MAX_PATH );

      dSprintf( cFilename, _MAX_PATH, "%s\system32\d3dx9_%d.dll", cPath, gD3DXDLLVersion );

      HANDLE hFile = CreateFile( cFilename, GENERIC_READ,
         FILE_SHARE_READ, 0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL, 0 );

      CloseHandle( hFile );

      if( hFile == INVALID_HANDLE_VALUE )
      {
         OutputDebugString( "DX Version Checker: Requested D3DX DLL version not found!\n" );
         dwVersion = 0;
      }
   }

   // Check version
   if( dwVersion < gDXVersion )
   {
      char promptMessage[512];
      dSprintf( promptMessage, sizeof( promptMessage ) / sizeof( WCHAR ), 
         "This application requires the %s or later.\n Press OK to install "
         "%s, or Cancel to exit.", gDXVersionString, gDXVersionString );

      long dw = MessageBox( 0, TEXT(promptMessage), "DirectX Version Checker", MB_OKCANCEL | MB_ICONEXCLAMATION );

      // If they cancel, just return false and let the init() deal with it
      if( dw == IDCANCEL )
         return false;
   }

   return true;
}