// ------------------
// GetFunction method
// ------------------
internal static T GetFunction <T>(this NativeLibraryHandle library, string procName, ref T function) where T : class
{
if (function == null)
{
var address = NativeMethods.GetProcAddress(library, procName);
if (address == IntPtr.Zero)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
function = Marshal.GetDelegateForFunctionPointer(address, typeof(T)) as T;
}
return(function);
}
internal static extern IntPtr GetProcAddress(NativeLibraryHandle handle, [MarshalAs(UnmanagedType.LPStr)] string procName);