private void LoadOSLayer()
{
string dirName = Application.StartupPath;
if (!Directory.Exists(dirName))
throw new Exception("No startup directory found " + dirName);
// The filename depends on the platform.
System.Version version = System.Environment.OSVersion.Version;
string loadfilename = null;
switch (System.Environment.OSVersion.Platform)
{
case PlatformID.Win32NT:
case PlatformID.Win32Windows:
// XP and later have Speech Synthesis.
// XP=5, Vista=6, W7=7
if (version.Major >= 5)
loadfilename = "RadSpeechWin";
break;
case PlatformID.Unix:
loadfilename = "RadSpeechLin";
break;
case PlatformID.MacOSX:
loadfilename = "RadSpeechMac";
break;
}
// If the name was not set, we do not support this platform
if (loadfilename == null)
throw new Exception("Platform not supported for Speech");
loadfilename = Path.Combine(dirName, loadfilename + ".dll");
try
{
Assembly assembly = Assembly.LoadFile(loadfilename);
// Examine the types exposed by this DLL, looking for ours.
foreach (Type type in assembly.GetTypes())
{
if (typeof(IRadSpeech).IsAssignableFrom(type))
{
foreach (var ci in type.GetConstructors())
{
if (ci.GetParameters().Length > 0) continue;
try
{
// This is the one. Instantiate it.
osLayer = (IRadSpeech)ci.Invoke(new object[0]);
return;
}
catch (Exception ex)
{
throw new Exception("ERROR in Speech OS Layer: " + ex.Message);
}
}
}
}
}
catch (BadImageFormatException)
{
// non .NET .dlls
throw new Exception("Speech OS Layer bad format " + loadfilename);
}
catch (ReflectionTypeLoadException ex)
{
// Out of date or dlls missing sub dependencies
throw new Exception("ERROR loading Speech OS Layer " + loadfilename + ", " + ex.Message);
}
catch (Exception ex)
{
throw new Exception("Exception loading Speech OS Layer " + loadfilename + ", " + ex.Message);
}
}
