需要引用单元 EncdDecd ，Xe验证通过。
function EncodeFile(const FileName: string): AnsiString;
var
stream: TMemoryStream;
begin
stream := TMemoryStream.Create;
try
stream.LoadFromFile(Filename);
result := EncodeBase64(stream.Memory, stream.Size);
finally
stream.Free;
end;
end;