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Microsoft KB Archive/172469

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Knowledge Base

Last Byte of Transparent Section Interpreted Incorrectly

Article ID: 172469

Article Last Modified on 7/15/2004


  • Microsoft SNA Server 4.0

This article was previously published under Q172469


The last byte in a transparent section gets interpreted as being outside the transparent section when the transparent section is immediately preceded by a control character (IE - "0D"). For instance, the following sequence has '0D' (carriage return) followed by a transparent section starting with '35'. In this case, the 1B (Esc character) would be inappropriately dropped and, therefore, the remaining bytes would be sent to the printer without the leading Esc character. This would cause the remaining bytes to be printed when they were actually intended to be part of the escape sequence.

0D35011B 5081F2F2 D9


When there is a control character immediately preceding transparent sections, there was a bug in the code which caused the print server to believe the transparent section to be one byte shorter than it really was.


A change was made to check whether a transparent byte has actually been sent to the printer before decrementing the number of transparent bytes left to be processed.


Microsoft has confirmed this to be a problem in Microsoft SNA Server, version 3.0 SP1. This problem was corrected in the latest SNA Server version 3.0 U.S. Service Pack. For information on obtaining this Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):


Keywords: kbbug kbfix KB172469