PrinterSniffer problem in reading text and image

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C#

My aim is to create a software that sniff the documents(contains text and image)

so i use ibm generic printer drivers that redirect output to my c# program using(RedMon)

i can read text data by using below code

Stream inputStream = Console.OpenStandardInput();


           byte[] bytes = new byte[120000];
           // richTextBox1.AppendText("To decode, type or paste the UTF7 encoded string and press enter:");
           //richTextBox1.AppendText("(Example: \"M+APw-nchen ist wundervoll\")");
           int outputLength = inputStream.Read(bytes, 0, 120000);
           char[] chars = Encoding.UTF7.GetChars(bytes, 0, outputLength);

           // Console.WriteLine(new string(chars));
          // richTextBox1.AppendText(new string(chars));
           txtEncodeData.Text = new string(chars);

My question is how can i read a standard input stream containing text and image ?