binary - Insert and extract fields from binary strings
(Dissect and join binary data into/from tcl values)
binary format formatString ?arg arg ...?
binary scan string formatString ?varName varName ...?
http://purl.org/tcl/home/man/tcl8.4/TclCmd/binary.htm
This is the primary command to use when Working with binary data.
For dealing with binary data on C level see also http://www.tcl.tk/man/tcl8.4/TclLib/ByteArrObj.htm
See Binary representation of numbers for an example of usage.
What are the issues when dealing with special values - 64 bits for instance?
See also: