Drawtext gives '?' for some Turkish characters

I used c# Graphics.DrawString method to draw text overlays on images. It can draw Turkish characters even if operating system does not have Turkish language package. However i am using directx-9 to draw now because of performance issues. If operating system has Turkish language package , directx draws Turkish characters, but if not, it does not draw.

Is there a way to draw Turkish characters via directx even if operating system does not have Turkish language package?

String comes from c# to c++ via wrapper.

drawStringWrapper(System::String^ text)
{
   char* textPtr = (char*)System::Runtime::InteropServices::Marshal::StringToHGlobalAnsi(text).ToPointer();
   drawStringD3DX(textptr);
}

This is how i create font,

D3DXCreateFont(dev,fontSize,0,FW_NORMAL,1,false,TURKISH_CHARSET,OUT_DEFAULT_PRECIS,DEFAULT_QUALITY, DEFAULT_PITCH | FF_MODERN, L"Arial", &d3dxFont);

I tried ANSI_CHARSET and DEFAULT_CHARSET. Also i tried different fonts, ex:L"Generic Sans Serif"